2019 LUNAR NEW YEAR HOLIDAY

Shodensha Vietnam is pleased to announce our schedule of Tet Holiday as follow:

 

– Our office will be closed from Saturday, 02nd February 2019 to Sunday, 10th February 2019

– Business operation will resume as normal on Monday, 11th February 2019

 

We would like to take this opportunity to thank you for your continuous support.

2018-2019 NEW YEAR HOLIDAY

Shodensha Vietnam is pleased to announce our schedule of New Year Holiday as follow:

 

– Our office will be closed from Saturday, 29th December 2018 to Tuesday, 01st January 2019

– Business operation will resume as normal on Wednesday, 02nd January 2019

 

We would like to take this opportunity to thank you for your continuous support.

Hair cuticle obsrvation 2

Even if you observe hair with raised magnification, I think that it is difficult to understand until cuticle.

(Only black foreign matter will simply become bigger.)

Observation with ring lighting

キューティクル

If it is a high magnification type with coaxial illumination, it will be slightly easy to see.

Furthermore, it is necessary to increase the resolution of the lens.

Super high magnification microscope SH140CCD-2R set price about 400,000 yen

Although it is a general-purpose price, those with low lens resolution (coaxial lighting)

キューティクル

Ultrahigh magnification high resolution CCD USB microscope USH140CCD-H1

Extremely high magnification microscope (coaxial lighting) set with high lens resolution

キューティクル

Metal microscope GR 3400 21 ten thousand yen.

There is a metallurgical microscope as a microscope of coaxial illumination.

Although it is not the original usage, you can see the cuticle clearly.

If you observe only the cuticle, I think that the most cost performance is high.

キューティクル

<Image comparison of hair cuticle observation>

Metallic microscope + camera for microscope (140 CCD camera) 400 times

キューティクル

 Ultra high magnification microscope (USH 140 CCD – H 1) 800 times

キューティクル

Simple coaxial microscope

キューティクル

ドーム照明  

Building a simple microscope with a combination of existing parts

 

Observation of cuticle at low price is possible.

However, the resolution of the lens will be reduced.

 

The tip can be exchanged with a microscope objective lens.

 

Please contact for more details.

How to see hair cuticle.

There are the following ways to observe the cuticle.

1. Observation with transmission method using microscope and sump method

2. Observation with metal microscope

1. Observation with transmission method using microscope and sump method

In the case of hair, observing with a microscope will make it appear as a black bar even if you increase the magnification.

髪の毛 Super High magnification USB microscope
SH140CCD-2R
Observe at 600 times

 

So I will introduce the SUMP.

<What is the Suzuki’s Universal Micro-Printing Method? >

There is a method called “SUMP ※1)」that takes out the shape of the surface of what you want to observe to a very fine part so as to take a mold and observes the thing you copied. It is ideal for observing objects that are impermeable to light, such as plant stem pores and hair cuticles.

* 1 You should buy a set of Sump Sump · Sump Paper · Sump Paperboard at the physical and chemical trading companies.

 

キューティクル2 Super High magnification USB microscope
SH140CCD-2R
Observe at 600 times

Observation with transmission illumination method using the Sump method

2.Observation with metal microscope

キューティクル4

GR 3400 J (Metallurgical Microscope)

HDCE-30B2 (USB Camera for 3 Megapixel Microscope)

A photographed image at 400 times magnification when viewing naked eyes

 

Even with a metallurgical microscope it is possible to see the hair cuticle.

However, the size of the metal microscope is as large as 203 x 255 x 421 (H) mm.

 

How they look depends on models and methods, please contact Technical Support for details.

How to clarify the outline of the image

Some USB cameras themselves have edge emphasis function, but this time we will introduce image processing method.

 

There is a technique called Unsharp Mask (USM).

There are also functions in PhotoShop etc., but other software also has this function installed.

USM is a type of filter that emphasizes color differences between pixels that make up an image.

 

Image before unsharp mask is applied

アンシャープマスク

Image after unsharp mask is applied

アンシャープマスク

Sharpen the image that makes you feel blurry in the whole.

It has a function to highlight the outline of the image.

Tips for observing glossy R section

R面

Observing the red circle with normal ring illumination makes the difference between halation and shadow large and very difficult to observe.

リング照明

Halation can be suppressed by using quadrant LED ring lighting and lighting only in the longitudinal direction.

LEDリング照明

if the light intensity is increased,

Observation of R part becomes possible.

If you increase the magnification as it is,

It makes observation of R part easier

R面
   
Using a diaphragm lens further increases the depth of focus and makes observation easier.
<Open the aperture> <Close the aperture>
絞り付レンズ 絞り付レンズ

 

However, if you use a diaphragm, it will become darker and the resolution will be slightly lower. So, our lens will be in the practical range up to about 120 times.

How to observe the edge of the R face neatly

When R is attached to the edge of a workpiece, it may not be seen clearly.

You can see clearly by devising magnification, lighting, background.

I tried to observe the edge of dry cell 乾電池を観察
   

1. Difference in depth of focus (compare at 80 times)

 
Open the aperture Close the aperture
絞りを開放 絞りを絞る
If you open the aperture, the depth of focus will become shallow and the edge may become blurred.
   
2.Difference in background color (compare at 80 times) 
When the background color is black When the background color is white
背景が黒 背景が白
The edge may be blurred due to reflection of the background, reflection of the edge part due to lighting, shadows.
   
3. Difference in magnification  
The depth of focus also varies depending on the magnification. (open the aperture and compare)
at 30 times at 80 times
30倍時 80倍時
Even with the same object, the edge may become unclear if the magnification increases.

 

Examples of halation inhibition

I will show two examples that can suppress halation.

 

  1. Polarization filter (halation removal set)

By using two polarizing filters, halation can be suppressed.

(For details, please refer to “Polarization observation”.)

  In case

   

<Actual example when polarization is actually applied 1 Solder of substrate>

It can suppress reflection of solder.

ハレーション抑制前 ハレーション抑制後
<Before suppression of halation> <After suppression of halation>
   

<Example 2 film in the case of actually applying polarized light>

The reflection on the film disappeared.

ハレーション抑制前 ハレーション抑制後
<Before suppression of halation> <After suppression of halation>
   

<Actual example when polarized light is applied 3 Stick for IC storage>

It is now possible to suppress the reflection of the surface of IC storage sticks and to read IC characters.

ハレーション抑制前 ハレーション抑制後
<Before suppression of halation> <After suppression of halation>
<Actual example when polarized light is actually applied 4 IC printing>
ハレーション除去 ハレーション除去
<Before suppression of halation> <After suppression of halation>

<Actual example when polarized light is actually applied 5 Solder part>

ハレーション除去 ハレーション除去
<Before suppression of halation> <After suppression of halation>

<Example 6 in the case of actually applying polarized light 6

Object in which high reflectance part and low reflectance part coexist>

ハレーション除去 ハレーション除去
<Before suppression of halation> <After suppression of halation>
<Actual Example of Actual Polarization 7 Printing on Film>
ハレーション除去 ハレーション除去
<Before suppression of halation> <After suppression of halation>
<Actual example when polarized light is actually applied 8 Object in a plastic bag>
ハレーション除去 ハレーション除去
<Before suppression of halation> <After suppression of halation>
<Actual example when polarized light is applied 9 Convex character of white resin (embossed part)>
ハレーション除去 ハレーション除去
<Before suppression of halation> <After suppression of halation>
   

2. High dynamic range function (HDR function)

This is a technique to expand the range of sensor operation at the expense of contrast.

Our C mount camera is installed in high definition camera and PC monitor direct camera.

   
<Actual example when polarized light actually applied 4 Axis of screw>
通常モード HDRモード
<Shooting in normal mode> <Shooting in HDR mode>
   
通常モード HDRモード
<Shooting in normal mode> <Shooting in HDR mode>

 

We will propose a method suitable for your use. Please contact technical support for details.

Tips for observing cutting edge of drill

There is a great difference between the part with a white streak and the part of a shadow in the metal processed article, the polished surface and the plated surface are especially innovative.

It is even more difficult if there are convex surface.

 

As one example, we confirmed the difference in appearance by changing (1) lighting, (2) camera, (3) background color, and (4) option for the cutting edge of the drill

 

ドリル Drill cutting edge of φ 1.8 mm
 
<Example 1>  
ドリルの刃先

(1) Lighting

FZ 300 PC 2 standard 80 lights LED ring lighting

(2) Camera

FZ 300 PC 2 standard 3 million pixel USB camera

(3) Background color

Black color

(4) Options

None

* Bright portions of metal and the like are white spots,

The dark parts are completely black.

 
<Example 2>  
ドリルの刃先

(1) Lighting

FZ 300 PC 2 standard 80 lights LED ring lighting

(2) Camera

FZ 300 PC 2 standard 3 million pixel USB camera

(3) Background color

White Background

(4) Options

None

 

* Even if the background is white, light reflected back to the background turns around, making it easier to see from the black background.

Although halation can be suppressed considerably, the part of the shadow can not be seen.

 
<Example 3>  
ドリルの刃先

(1) Lighting

FZ 300 PC 2 standard 80 lights LED ring lighting

(2) Camera

FZ 300 PC 2 standard 3 million pixel USB camera

(3) Background color

White V-shaped background

(4) Options

None

 

* By making the background white paper V letter, more light turns around and becomes easy to see.

  V字
 
<Example 4>  
ドリルの刃先

(1) Lighting

FZ 300 PC 2 standard 80 lights LED ring lighting

(2) Camera

FZ 300 PC 2 standard 3 million pixel USB camera

(3) Background color

White

(4) Options

Adding polarization filters to each lens and illumination (halation removal set)

  偏光フィルタ
 
<Example5>  
ドリルの刃先

(1) Lighting

Change to arch type lighting

(2) Camera

FZ 300 PC 2 standard 3 million pixel USB camera

(3) Background color

White

(4) Options

None

 

* Arched lighting is a special indirect lighting for seeing the reflecting cylinder.

  ドーム型照明
 
<Example6>  
ドリルの刃先

(1) Lighting

Change to arch type lighting

(2) Camera

FZ 300 PC 2 standard 3 million pixel USB camera

(3) Background color

White V-shaped background

(4) Options

None

 

※ The shadow portion and the white jump portion are gone, so you can shoot very beautifully.

   

Another method

There is an halation suppression function (average brightness function (HDR function)).

(It is a function attached to the camera, there are things that are not available depending on the camera.

   
<Example7>  
ドリルの刃先

(1) Lighting

FZ 200 HD 2 standard 80 lights LED ring lighting

(2) Camera

FZ 200 HD 2 standard high definition camera

(3) Background color

White

(4) Options

None

※ Average brightness function OFF

   
<Example8>  
ドリルの刃先

(1) Lighting

FZ 200 HD 2 standard 80 lights LED ring lighting

(2) Camera

FZ 200 HD 2 standard high definition camera

(3) Background color

White

(4) Options

None

* Brightness average function ON

   
<Example10>  

Adding a white V-shaped background to the average brightness function makes it easier to see Drill’s cutting edge .

ドリルの刃先

(1) Lighting

FZ 200 HD 2 standard 80 lights LED ring lighting

(2) Camera

FZ 200 HD 2 standard high definition camera

(3) Background color

White V-shaped background

(4) Options

None

* Brightness average function ON

   
※C mount camera with halation suppression function (brightness average function (HDR function))
ハイビジョンカメラ  
Full HD camera with USB flash slot
GR200HD2
 

 

How to measure height and thickness with a microscope?

The easiest way is to combine microscope and digital indicator.

Choose lens as shallow as possible in depth of field.

Mechanism that moves up and down can measure accuracy with fine adjustment function with high accuracy.

デジタルインジケータ
   
1.Thickness measurement

Transparency or semitransparent film is a condition under which the object that the sheet is in close contact with the substrate can be measured.

 

A transparent protective sheet is in close contact with the product on the right object.

 

Because the sheet is thin, I observed it at 600 times

WIFIルーター
   

Focus on the substrate (resin)

Set the value of the indicator to zero

Focus on the top of the sheet

Read the value of the indicator.

This will be thick. (107 μm)

デジタルインジケータ
   
2.Height measurement  

(1)
It is a condition that you can measure the object on which the step can be projected on one screen.

 

Measure the IC height on the left photo.

 

I have observed it at 200 times because I have enough height.

高さ測定
   

Focus on the substrate

Set the value of the indicator to zero.

Focus on the top of the IC

Read the value of the indicator.

This will be the height. (2.39 mm)

インジケータ
   
We have two kinds of stand with digital indicator (height gauge) available.
デジタルインジケータ付スタンド

Coarse fine movement stand with indicator

GRS-1C125XB

Small coarse and fine stand with indicator

GR-S6C125XB

 

How to measure height (Z pivot) ?

We introduce the height measurement (Z pivot measurement) system.

1. System configuration

Install the Z pivot stage and the motor controller in the microscope.

(Microscope (our company), Z pivot stage (Chuo Seiki products), both are general purpose goods.)

Z軸測定 Z軸測定
I will use focus synthesis software and 3D creation software of Mitani software for this system.
   
2.How to operate?
(1)Focal Composition  
焦点合成
   
(2)Create 3D image  
Combine the photos synthesized with the microscope and the position information of the motor into a 3D image.
3D画像
Z軸 Z軸

From the microscope’s perspective, the vertical surface or nearly vertical surface can not be seen. So, height measurement can be done without problems.

 

When there is a slope on the wall surface, a relatively beautiful 3D image can be formed.

 

As an example, I will make a dent of cardboard a 3D image.

3D

You can figure out any size and cross section shape from here.

The following yellow line is a optional drawn.

3D
   
3D

Since it is not a measuring machine, there is no precision.

The minimum step of the Z axis table (0.5 μ this time) is the resolution.

Depending on how you use it, you can get some accuracy.

 

How to measure with a digital XY table?

Select the camera that can draw a cross line on the monitor.

Our PC monitor direct camera, high vision camera has cross line display function.

 

Measurement of outer diameter of rings

 

1. Use transillumination to emphasize edges.

2. Display the cross line on the screen.

XYテーブル

3. Align the cross line with the end of the measurement point.

4. Reset the digital micrometer to zero.

計測

5.Using a micrometer, move to the other end side

6. At this time, the value of the micrometer will be the outside diameter.

計測計測

Advantages:

(1) Calibration before measurement is unnecessary.

(2) Even objects that can not be captured on one screen can be measured.

(3) Depending on the accuracy of the micrometer, accuracy can be expressed including the calibration certificate.

 

 

Disadvantages:

(1) It takes time to measure.

(2) It can only measure horizontal and vertical.

(When using a XY table, oblique measurement is also possible)

(3)) It can measure only the distance between two points. (Measurement of angle, area, distance between centers of circles, etc. can not be done.)

How to attach a single camera len to a C mount camera?

Conversion adapters as the following are on sale in order to attach the single camera lens to the C mount camera.

 

Cマウント Cマウント
   

Flange back of EOS is 44mm

フランジバック

Flange back of C mount is 17.526 mm

フランジバック

Lenses for single lens reflex cameras can be mounted on C mount cameras.

Focus is achieved by offsetting 44 – 17 mm = 27 mm.

However, when attaching a C mount len to a single len reflex camera, the flange back is too close and there is no focus.

(If you do not let the lens into the camera, the focus will not match.)

How to measure accurate dimensions?

Telecentric lens with less image distortion are superior to macro lenses when measuring high-precision dimensions.

When a telecentric lens is used, the depth of field is not extremely deep. However, there is no dimensional fluctuation of the observation image if it is within the depth of field as a feature of the telecentric lens, It is difficult to measure errors and you can measure with high accuracy.

 

RT3 Telecentric len RT3
たる型 糸巻き
<Distortion is large>

High accuracy such as  dimension measurement

  When measuring distortion,

  you should choose a small lens.

ディストーション
<Distortion is small>

With a telecentric lens,

  distortion is small, high accuracy measurement becomes possible.

 

< Shooting by telecentric lens with RT3>

被写界深度

Glass scale in increments of 0.2 mm

with a telecentric lens and shooting

開放時

<When open aperture>

Focus on the area surrounded by red

In the status where the aperture is open

It goes to the right side of the glass scale and it is not in focus.

絞り時

<When narrowing the aperture>

Like the photo above, focus on the area surrounded by red. While matching,

I narrowed the aperture.

On the right side of the glass scale

even around the broken line without blurring of images. It is clearly reflected.

 

Please contact for more information.

What’s lens resolution?

There is resolution as lens performance.

Some expressions such as “how many lines” and “mega pixel “.

Recently, there is a tendency to place emphasis on the total representation of images including the reproducibility of contrast rather than just focusing on the resolution.

(The lens tends to degrade the reproducibility of contrast as the resolution increases.)

The resolution of the lens will change in the entire zoom range and also in the aperture.

(For example, even if it is said to be a 3M compatible lens (3 million pixel compatible lens), it is open and the resolution becomes the best condition.)

Camera resolution and lens resolution do not necessarily have to match.

If it is used for PC monitor , the resolution of monitor is lower and there are cases where you do not receive any benefit at all.

Resolution needs to be considered throughout the system.

What is NA (Numerical Aperture)?

The NA (numerical aperture) of the lens is an index for judging the brightness, resolution and depth of focus of the lens.

NA = n × sin θ.

 

NA(開口数) NA(開口数)
   

From above picture, 0 <θ <90 °.

It means 0 <NA <1. (In air)

(NA is determined by θ and refractive index.)

NA is larger, the lens will be brighter.

Light always tries to spread. (Diffraction)

It is necessary to narrow down at the largest possible angle in order to narrow down

NA is larger, the resolution is higher too. (When comparing at the same magnification)

The resolution = (0.61 × λ) / NA.

NA is higher, the depth of focus becomes shallower

The depth of focus = λ / (the square of NA).

Most of the microscope objective lenses have NA information.

対物レンズ

C mount zoom lens will change significantly depend on magnification.

(The lens principal point (theoretical value) will change by changing the lens magnification.)

The following is an excerpt from a catalog of a manufacturer.

カタログ抜粋

With a very special C mount zoom lens, NA does not fluctuate as shown below.

However, it becomes larger and more expensive.

特殊なCマウントズームレンズ

What is the F value (lens brightness) of a len?

The value of the aperture (iris) of the camera is shown by the F value. (It differs from lower f value.)

The value of the brightest (aperture open) status of the lens is called the open F value.

 

The open F value is used as an indicator of the lens brightness.

(Lens with small open F value is said to be “bright lens”.)

 

The brightness is halved each time, the F value becomes √ 2 times.

When the F value is 2.0 is 1, the brightness is halved F2.8 (2.0 X √ 2 = 2.8).

What is f value (focal length) of the lens?

The distance from the principal point of the lens to the focal position at which the lenses connect the image.

焦点距離

In the case of a single lens, the principal point often comes to the center of the lens as described above. However, normally the CCTV lens is made up of multiple lens.

In that case, it becomes the synthesized main point. (The principal point may be outside the lens.)

If it is a C mount len, the distance from the lens to the focal position is fixed. (This is called flange back, becomes 17.526 mm.)

Therefore, the f value (focal length) is an index showing the field of view of the lens.

 

Even with lenses of the same shape, the principal point is closer to the image pickup device if the f value is small.

 

In other words, the field of view gets wider. (Blue line in the figure below)

If the f value is large, the principal point becomes farther from the image sensor. The field of view gets narrower. (Red line in the figure below)

f値

What’s back focus?

Back focus is the distance from final point of lens to the focal plane (camera’s image sensor). If the back focus is out of focus, it will be out of focus too.

The distance (camera flange back) from the C mount of the camera to the image sensor surface may be slightly different depending on the camera. Therefore, when changing the lens or camera, it is necessary to adjust the back focus.

(We combine the camera and the lens. Our company has shipped after adjustment carefully)

In case of lens with back focus adjustment mechanism, you can also adjust by yourself.

At our company we also sell lens with back focus adjustment mechanism as option lens.

 

SDS-M19 Lens with back focus mechanism
SDS-M19

 

Please contact for more information.

How to reduce image distortion?

By using a telecentric lens, it is possible to obtain images with less distortion.

I experimented with our telecentric lens RT3, RT5.

 

テレセントリックレンズ

Attach telecentric lenses RT 3, RT 5

to a USB camera (GR 200 BCM)

テレセントリックレンズ テレセントリックレンズ
shoot with
Tlecentric lens RT3
shoot with
Tlecentric lens RT5

You can see that there are no distortions in the four corners of the screen.

This is the feature of a telecentric lens.

 

If you are using a CCTV lens, distortion will be less when using a telephoto lens than a wide angle lens.

I tried with a fixed focus lens of 6 mm and a fixed focus lens of 25 mm.

 

固定焦点レンズ

Attach 8 mm fixed focus lens

to a USB camera (GR 200 BCM)

歪み You can see that the four corners of the paper are distorted.
固定焦点レンズ

25 mm fixed focus lens

Attach a fixed focus lens to a USB camera (GR 200 BCM)

歪み Distortion is not appear in the corners of the paper.

 

There are some with less distortion depending on the performance of the lens.

However, it is quite expensive.

Please contact us if you have any questions.

What is a telecentric lens?

Parallax means the direction in which the target point can be seen differs depending on the position of the observation point at two points.

Telecentric lenses with less distortion due to parallax.

 

Observe the following sample with different lenses.

       

Observe the sample on the right by changing the lens

Field of view 60 X 40 mm

Pillar height 60 mm

テレセントリックレンズ
   
●Observe by telecentric lens  
テレセントリックレンズ テレセントリックレンズで観察
   
●Observe with other lens  
テレセントリックレンズ 固定焦点レンズで観察

<2. There is no expansion / contraction of the image within the depth of focus>
   

●Observe by telecentric lens  
テレセントリックレンズ

Observe from the point that the focus is perfectly matched to ± 3 mm

(Within depth of focus)

   
テレセントリックレンズ

When the focal length is 105 mm

(Focus is perfectly matched)

 

The left photograph is the one which measured the diameter of the circle of the object.

Let’s change the focal length while keeping the diameter size and the circle display (red line).

   
テレセントリックレンズで観察

Focal length 108 mm

(A status in which the lens is raised 3 mm upward from the distance where the focal point is perfect)

 

You can see that there is no deviation between the circle display (red line) and the circle of the object. There is no expansion and contraction of the image within the depth of focus.

   
テレセントリックレンズ

Focal length 102 mm

(A status in which the lens is lowered 3 mm downward from the distance where the focal point is perfect)

 

You can see that there is no deviation between the circle display (red line) and the circle of the object. There is no expansion and contraction of the image within the depth of focus.

   
●Observe by other lens  
CCTVレンズ

The left photograph is the one which measured the diameter of the circle of the object.

Let’s change the focal length while keeping the diameter size and the circle display (red line).

   
CCTVレンズ

Focal length 107 mm

(A status in which the lens is raised 3 mm upward from the distance where the focal point is perfect)

 

You can see that there is a gap between the circle display (red line) and the circle of the object. The image is contracting.

   
CCTVレンズ

Focal length 101 mm

(A status in which the lens is lowered 3 mm downward from the distance where the focal point is perfect)

 

You can see that there is a gap between the circle display (red line) and the circle of the object. The image is swelling.

 

We have various of telecentric lenses available.

Please check this out for details. → Telecentric lens

What is distortion?

Distortion (distortion aberration) means the position in which the image projected through the lens is distorted.

Generally, lenses of wide-angle type are likely to cause barrel type aberration and telephoto lenses are very easy break to pinch winding aberration

樽型
糸巻き型
<Barrel aberration>
<Pinch Winding Aberration>

 

<Shooting with fixed focus lens>

CCTVレンズ Using 8 mm fixed focus lens
CCTVレンズ

Using 12 mm fixed focus lens

CCTVレンズ Using 25 mm fixed focus lens
CCTVレンズ
Fixed focus lens

 

We will also assist in selecting fixed focus lens.
Please feel free to contact Technical Support.

What is aberration?

Aberration is the deviation from the ideal image formation in the optical system.

It is divided into two include: single chromatic aberration and monochromatic aberration.

You can further break down from here.

  • Monochromatic aberration (axial chromatic aberration, magnification chromatic aberration)
  • Single chromatic aberration (spherical aberration, coma aberration, astigmatism, field curvature, curvature aberration)
  • Chromatic aberration occurs due to the difference in refractive index depending on wavelength (color).

Symptoms such as color drift and color blur occur on the screen.

  • Single chromatic aberration (despite of curvature aberration) is due to the difference in the angle of incidence of light passing through the lens and the difference in passing position

Symptoms such as outline blur and bleeding occur on the screen.

 

* There is no blurring in curvature aberration. The line is curved at the periphery (edge) of the screen.

Depending on the symptoms of curvature, it is divided into a pincushion type and a barrel type.

(For curvature aberration, please refer to “What is distortion?”)

 

<About monochromatic aberration>

The focal point is connected at one point. However, the refractive index varies with the wavelength, the focal position will be shifted. This will occur as color drift and color blur on the screen.

色収差

It is a photograph of 10 yen coin at 1000 times.

The above picture was taken with the ultrahigh magnification microscope (SH140CCD) with low price.

The picture below is taken with a super high magnification microscope (USH 140 CCD – H1) using a high performance lens

 

●Taking by the ultra-high magnification microscope (SH140CCD-2R) with low price
色収差  
   
●Taking by a ultrahigh magnification microscope (USH 140 CCD – H1) using a high performance len
色収差  

 

You can see that color misalignment occurs when enlarging a part of the above picture (taken with the ultrahigh magnification microscope (SH140CCD – 2R)

 

<Single color aberration>

No matter where it passes through the lens, the focal position is on the same plane regardless of the angle of incidence at any angle. The focal position shifts due to the difference in refractive index.

This occurs as blurring or bleeding of the contour.

単色収差

It is a photograph taken at 1000 times of a silicon wafer.

The photograph on the left was taken with the ultrahigh magnification microscope (SH140CCD – R) with low price

The picture on the right was taken with a super high magnification microscope (USH 140 CCD – H) using a high performance len.

 

単色収差 単色収差
Taking by the ultra-high magnification microscope (SH140CCD-2R) with low price Taking by a ultrahigh magnification microscope (USH 140 CCD – H1) using a high performance lens

 

The picture on the left shows a blurred outline.

We also provide free demonstration machines. Please contact for more information.

What’s view angle?

The range of the scene in the photo taken by camera is shown in degrees. It is also called view angle.

 

It is important to determine the view angle of the lens when taking photos. This field angle is determined by the focal length of the lens and the field angle of the camera.

 

In the specifications of the lens, the range appears when the camera is set in the horizontal position is indicated by view angle of horizontal, vertical and diagonal. If only one thing is marked, it is called view angle of the diagonal.

 

Lens with a wide view angle is called a wide angle lens and lens with a narrow view angle is called a telephoto lens.

画角

How to extend W.D?

If you can sacrifice the magnification, 0.5 times of auxiliary lens will extend the WD

 

TG0.5

0.5 × auxiliary lens for standard lens

TG-0.5

<Example>

When 0.5 times auxiliary lens is attached to TG 500PC2, the standard magnification from 23 to 140 times will be changed 11 to 70 times,

The standard focal length was 90 mm will be changed to 160 mm.

 

In that case, the position of LED ring light attached to the tip of the lens also departs from the object, the illumination becomes dark. Thus, changing more intense illumination or removing the diffuser plate will be very necessary.

高輝度80灯LEDリング照明

High brightness 80 lights LED ring light

GR-80N2

拡散板 With removable diffusion plate

It is possible to change the position of the ligh using LED angle. However, it will disturb the extended WD. Therefore, it is necessary to use twin arm light (SPF – D 2) or LED spot light (GR – FL 21)

LEDアングル使用例

I used a 0.5 times auxiliary lens to extend W.D.

If you use the LED angle to lower the lighting position, the extended W. D will be lower.

Therefore, we recommend using twin arm lighting (SPF – D 2) or LED spot lighting (GR – FL 21)

ツインアーム照明

Twin arm LED light SPF-D 2

 

Stationary type dimmable LED twin arm light.

LEDスポット照明

Low price LED spot light GR-FL2

It can be attached to φ 20 mm or φ 25 mm pillar.

 

Please contact for more information

Depth of focus of high magnification lens

Let’s measure the depth of focus of our high magnification microscope.

A glass scale of 0.2 mm pitch

I shot it at an angle of 45 °.

In order to get depth if it is inclined by 45 °, multiply 1 / √ 2.

被写界深度
   
Lens at scale 2
without auxiliary len
高倍率レンズ
   
高倍率レンズ
0.5 mm x (1 / √ 2) = 0.35 mm if it is judged that the focal point is at 0.5 mm
   
Lens at scale 4
without auxiliary lens
高倍率レンズ
   
高倍率レンズ
0.3mm x X(1/√2)=0.21mm if it is judged that the focal point is at 0.3 mm

 

The magnification and depth of focus will be the same even if an auxiliary lens is attached.

If you use 2x auxiliary lens, the depth of focus is 0.21 mm” at “scale 2” as above.

The depth of focus of medium magnification lens (SDS-M)

Let’s try to measure the depth of focus of our medium magnification lens (SDS – M).

<1> 
Lens
medium magnification lens
(SDS-M)

Magnification 20x

Object 
0.5mm pitch
glass scale
GS-0.5

被写界深度

If it is judged that the focus indicated by the red frame is in focus … 0.5 x 7 x 0.71 = 2.5 mm

<2> 
Lens
medium magnification lens
(SDS-M)

Magnification 60x

Object 
0.2mm pitch
glass scale
GS-0.2

被写界深度

If it is judged that the focus indicated by the red frame is in focus … 0.2×3 x 0.71 = 0.42 mm

 

<3> 
Lens
medium magnification lens
(SDS-M)

Magnification 120x

Object 
0.2mm pitch
glass scale
GS-0.2

被写界深度

If it is judged that the focus indicated by the red frame is in focus … 0.2 x 2 x 0.71 = 0.3 mm

Depth of focus of low magnification lens

I measured the depth of focus of our low magnification microscope.

Case 01

 

Model used

Lens: Low magnification lens SDS-LRS

Camera: 5 MP USB camera

 

Taking an object at an angle of 60 °

被写界深度
   

 

I took a picture by tilting the gold scale to 60 °.

The aperture of the lens is open.

The depth of focus is not an objective number but it is a subjective value.

被写界深度

90 mm X sin 60 ° = 78 mm.

In the vertical direction, the focal depth is 78 mm.

This low magnification lens has
an aperture function.

絞り
   

If you close this aperture, the depth of focus will deepen.
被写界深度

Since the focus is on the whole screen, this method can not calculate accurately. But it will be over 100 mm.


Case 02

 

Model used

Lens: Low magnification lens SDS-LRS

Camera: 5 MP USB camera

 

Taking an object at an angle of 45 °

被写界深度
   
1.Set 20.0 mm x 15.0 mm as the field of view (about 20 times)
絞り
Open
絞り
Close
   
In same 20 times level, shoot a board carrying a capacitor with a height of 20 mm
絞り
Open
絞り
Close
   
2.Set to 10.0 mm x 7.5 mm field of view (about 40 times)
絞り
Open
絞り
Close
   
In the same 40 times, shoot a board carrying a capacitor with a height of 8 mm
絞り
Open
絞り
Close

 

The depth of focus decreases since the magnification increases.

You can adjust by using the aperture.

However, increasing the amount of narrowing will cause the image to become dark, so it is necessary to significantly increase the amount of light.

 

You can cover it to some extent by adjusting items such as “Brightness” “Gain” “Exposure” on the camera side.

Depth of focus/depth of focus field

Popular focused on a general lens is one point.

(Except for special lenses for precision measurement like telecentric lenses.)

There is a region with less focus blur before and after the point where perfect focus is on.

This is called depth of focus.

When it deviates from a point where it is completely in focus, it gradually blurs. Where is the practical range will be the subjectivity of the individual. By narrowing down the optical path, you can gradually reduce this degree of blurring. However, by narrowing, the image becomes dark, so you can not use it with a lens with a high magnification.

 

絞り付マイクロスコープ

The left picture is our company’s USB microscope

USB microscope with aris
MS200PC3(20x~110x)

   

 

Compare the images when opened and narrowed with this irised microscope.

(When you narrow down the aperture, the depth of focus becomes deeper.)

<at 50x>
●Glass scale
Tilt the 0.5 mm pitch glass scale to 45 degrees and observe straight from the top

<Open the aperture>  <Close maximum aperture>
絞りを開放 絞りを最大

Since it is tilted to 45 degrees, it will be the depth of focus if multiplied by 1 / 1.41.

The focus on individuals depends on individual opinions.

If it is judged that 4 pitches (= 2 mm) are matched, 2 mm × (1 / 1.41) = 1.42 mm can be said as the depth of focus.

For board

Tilt the substrate at 45 degrees and observe it 50 times.

(1.6 mm × 0.8 mm electronic components are lined at 1 mm pitch.)

 

<Open the aperture>  <Close maximum aperture>
絞りを開放 絞りを最大

<at 100x>
●Glass scale

I also checked the times at 100 times for your reference.

Since the magnification is high, the glass scale has been changed to 0.2 mm pitch

<Open the aperture>  <Close maximum aperture>
絞りを開放 絞りを最大

 

if this range is judged as a practical range, focus range is 1.2 mm × (1 / 1.41) = 0.85 mm

Please note that narrowing the aperture will make the lens darker and the resolution will also decrease.

(For details, please refer to “NA (Numerical Aperture)”.)

I would like to observe in the wide range of 1 to 1000 times.

If the wide range is 1 to 1000 times, it means that a lens with a zoom ratio of 1: 1000 is necessary. Currently, only the high zoom level of 1: 12 is available around the world.

The zoom ratio is 1: 6.5 with our variable magnification lens standard type (SDS – M).

In other words, a wide range of 1 to 1000 times physically is impossible.

So the only way to achieve the wide range is to prepare several lenses.

The camera used for our microscope is a C mount and it is common, so changing the lens is easy.

However, when changing the lens, it is necessary to review the lighting. Especially, when you observe at 1000 times, lighting with considerable brightness is required.

標準レンズ
model
number
mount
Supported camera
W.D.
magnification
※1
SDS-M
C mount
1/2、1/2.5、1/3inch
90mm
20~120x

※1 The magnification when attached to our 1/2-inch camera and observed with a 17-inch monitor

 

For inquiries about lighting / lenses, please contact the Technical Support desk for demo machine requests.

How to reduce the magnification of high magnification zoom lens (FZ series)

We will introduce our “High-magnification lens “.

Our FZ series zoom len is a high magnification zoom lens.

The field of view at the minimum magnification is 9 × 6.7 mm (if 1/2 inch camera is used).

 

There are 0.5 times auxiliary lens (option) with our other lens (DS series).

I will divert this auxiliary lens.

倍率を下げる方法

倍率を下げる方法

倍率を下げる

倍率を下げる  

A field of view of 18 x 13 mm can be secured.

(If using 1/2 inch camera)

 

The left photo shows a circle with a diameter of 10 mm

 

With a 1 / 2.5 inch camera, you can see the whole 10 mm circle.

 

What’s auxiliary lens (Rear converter lens)?

By installing it between the camera and the main lens, you can change the magnification without changing the WD (working distance).

However, there is a disadvantage that the brightness declines (the F value increases), the resolution and the contrast are lowered and the focus is not sharp.

 

2倍リアコンバーター
リアコンバーター取付例
x2 rear converter
Install it between the camera
and the main lens.

What is an auxiliary lens (front converter lens)?

You can change the magnification by attaching it to the front (object side) of the main lens. It is also possible to change WD (working distance).

 

保護レンズ
 
0.5x auxiliary lens
for sds-m lens TG-0.5
 

 

<0.5 times change in magnification and focal length when using auxiliary lens>

 
magnification
working distance
TG500PC2
25x~135x
90mm
TG500PC2
+0.5x auxiliary lens
13x~65x
150mm~160mm

 

<Difference in appearance when 0.5 x auxiliary lens is attached to TG500PC2>

0.5倍補助レンズ
0.5倍補助レンズ
TG500PC2 (without 0.5 auxiliary lens at the lowest magnification)
TG500PC2 (with 0.5 auxiliary lens at the lowest magnification)

You can see that the field of view has expanded by attaching 0.5 times the auxiliary lens.

* When using a 0.5 times auxiliary lens, the working distance changes and the distance from the lighting to the object increases. Thus, it is necessary to change the position of the lighting using the LED angle.

LEDアングル
LEDアングル取付例
LED angle LED-A2
LED ring light at LED angle

 

How to choose CCTV lens?

From the size of the object you want to shoot, you can calculate the necessary lenses.

The needed thing at this time is the size of the image pickup device of the camera and the distance to the object (WD).
CCTV

For example, if you want to secure a vertical field of view of 300 mm with 1 m WD, how many millimeters should the f value be? (I will use a 1/2 inch camera.)

 

The image sensor size of 1/2 inch camera as follows.

撮像素子サイズ

f = (distance to object (mm) X vertical size of imaging device (mm) / vertical field of view

= (1000 mm X 4.8 mm) / 300 mm = 16 mm

Choosing a lens with f = 16 mm will ensure the desired vertical field of view.

You can calculate the horizontal field of view as well.

 

By the way, you can easily calculate the horizontal field of view.

If it is a square type imaging device, the aspect ratio is 4: 3 . Therefore, the horizontal field of view will be 400 mm without calculation.

CCTVレンズ
 

We have various CCTV lenses available. Please check this for details.

 

What is macro lens / macro zoom lens?

A lens designed for photographing a close distance is called a macro lens.

In the macro lens, the magnification can be changed continuously, and the focal length is constant (unchanged) is called macro zoom lens.

マクロズームレンズ マクロズームレンズ

Though the magnification can be changed continuously, the one whose focal length changes will not be strictly a zoom lens.

Sometimes it is called a variable magnification lens distinguished from a zoom lens.

マクロズームレンズ マクロズームレンズ

 

If you do not change the magnification frequently and want to reduce the price, you should you variable magnification lens. If you change the magnification frequently, a macro zoom lens is recommended.

What’s zoom lens?

Zoom lens is a lens in which the image size can be varied continuously while the image remains in focus.

The zoom ratio of 12 (1:!2) is the physical limit of zoom macro lens.

In addition, the lens in which the magnification can be varied continuously while the image does not remains in focus is not a zoom lens but a lens with variable magnification.
In other words, focal distance changes but magnification also changes is cheaper than the zoom lens is the characteristics of the lens with variable magnification.
Our company has various types of lenses. Please see the products here.

You can choose the lens according to the characteristics such as magnification, focal length, price, etc.

Besides, please consult us to select appropriate lenses. Please contact the technical support.

About explosion-proof specification of borescope

ボアスコープ 

The explosion-proof specification will be “Specifications that have taken special technical measures so that it will not be an ignition source of combustibles”.

 

Unlike an endoscope with a built-in camera at the tip, the borescope is made up only lens and fiber. There is no electric thing at all.

(The borescope itself is not an ignition source.)

 

Of course, dedicated equipment is required for light source devices and cameras in environments where explosion-proof is required.

For example, it seems that the following explosion-proof C-mount camera are on sale.

ボアスコープ

Heat resistant of borescope

Heat resistant of borescope

If it exceeds 150 ° C, a cooling device is required and it becomes a complete custom product.

In case the cooling system is unnecessary, it is up to 150 ° C.

Additional devices are unnecessary so it can be introduced easily.

耐熱ボアスコープ

A separate cooling device is required. It is possible to correspond up to about 1800 ° C.

However, additional equipment such as cooling equipment is also required, so it will be completely customized.

耐熱ボアスコープ

This is only a guide, it shows the following two points.

・The cooling enclosure is mounted in a borescope of φ5.5 or φ4 mm and it is about φ14 mm.

・The maximum length is 1000 mm at 800 ° C. We will designate it as below:

 

耐熱ボアスコープ  

Where to place the water inlet and drain outlet also depends on the customer’s request.

 

   It may be the camera type or direct observation. It will be the specification of the customer’s preference.

     
耐熱ボアスコープ

 

Reference: Custom-made · Heat-resistant scope price

(Price is determined by various conditions, please see it as a guide only)

耐熱ボアスコープ

Optional:

Lighting is attached to normal borescope but in custom case, lighting is optional.

In bad environment, you can also install an air purge so that the tip does not get dirty

I can do it. (We call it as an air cleaner.)

Questions about heat resistant borescope are received from here.

Please fill out the specification sheet below and send it to us by e-mail or fax.

E-mail:info@shodensha.com.vn

※Because all heat-resistant of borescope is made to order, we are sorry that there is no preparation of demonstration machine.

Types and characteristics of endoscope

There are three types of endoscopes, largely divided into three types.

Each has advantages and disadvantages.

You can connect to a PC or view the video on a monitor in any type.

(The required options are different.)

1.Borescope (rigid mirror)

It is a type that contains a rod lens at the tip.

Basically there seem to be many like the following form.

ロッドレンズ

There are also types that can be directly connected to the monitor as shown below.
硬性鏡

(advantage)

Since the tip is only the lens, it can be made small diameter.

It is possible up to φ0.7 mm.

The picture is the most clear when you see only the part of bore.

(disadvantage)
The part of the bore is expensive.
Since the tip is a lens, it is vulnerable to impact.
Since it is a lens, it can not bend the tip.
(you can choose direct view, strabismus, side view as type.)
it can not be made a physically long one. (Generally up to about 30 cm)

2.Fiberscope
The tip is an optical fiber.

ファイバースコープ

(advantage)

The relay section flexes flexibly. (At the level where the fiber will not break)

Can be made thinner than borescope.

It is possible up to φ0.35 mm.

(disadvantage)

The resolution is decided by the number of fibers being bundled.

(As the diameter becomes smaller, the number of bundles decreases and the resolution drops.)

A thin line will be visible at the boundary of each fiber.

Although it is possible to have a length longer than the bore, it attenuates as the light passes through the fiber, so if you lengthen it, a strong light source is required.

3.Advanced Camera Type
A small camera is enclosed at the end of the endoscope.

内視鏡

(Advantages)

Because there is no special lens or fiber, the price is the cheapest.

(There are also expensive ones with various features, but basically it will be cheaper.)

Since the relay section is an electric wire, it can be bent over the fiber.

Since it is electronic equipment, it is a monolithic one with many monitors, so you can make various applied products.

 

(Disadvanatges)

The resolution is determined by the camera.

(The smaller the size, the worse the resolution will be.)

Can not be thinner than the size of the camera. (At the smallest about φ1.8 mm)

 

The advanced camera type has various types as it is not subject to the restrictions of rod lens and fiber.

内視鏡   内視鏡

Made by Kenko

Ultra low price

Single function type

 

Made by ERF

While having a small diameter of φ 2.8 mm,

it can control the direction of the tip at hand

     
内視鏡   内視鏡

Made by Mitcorp

For in-pipe inspection of length 22 mm

Waterproof type

 

Made from SPI

As a camera type

Minimum diameter φ 1.8 mm

 

What’s causes of haze of borescope field / attention on using borescope?

The borescope contains a very elongated “glass” lens (rod lens) inside.

Therefore, if you receive a strong impact instantaneously, the glass lens inside may crack or break.

 

For glass protection, it is enclosed in a stainless steel tube. But, please be careful especially when handling long and small diameter.

               

Drop    
ボアスコープ ボアスコープ ボアスコープ
     
Touching    
ボアスコープ ボアスコープ ボアスコープ
     
Bending (bending with a strong force from the side)
ボアスコープ    

 

<Status>

The most common problem with borescope troubles is that the field of vision is hazy.

ボアスコープ ボアスコープ ボアスコープ
     
ボアスコープ ボアスコープ ボアスコープ
     
When it breaks completely, it turns black.  
ボアスコープ ボアスコープ ボアスコープ

 

If it breaks or cracks, it will replace all lens parts.

The repair fee will also be expensive.

The bottom photo is the actually broken lot lens.

ボアスコープ

For preventive measures, some customers are using the following commercially available tubes.

ボアスコープ

How to hang video camera?

ビデオカメラ   Originally, I used a tripod screw for fixing this camera,
     
     (top of camera)
ビデオカメラ
 

Some people are using four screws by removing the pan head as being uneasy with one point stop.

The same is true for an elderly.

In this case, please make sure that the entry part of the screw from the case of the camera is 3 ~ 4 mm.

(It will hit the connector when it is long.)

ビデオカメラ

There is another method in case of hanging down.

ビデオカメラ

ビデオカメラ   You can use it as
shown on the left picture.

 

What’s the most suitable camera for borescope?

Borescope is a product that often observes the inside of metal workpieces.

Depending on the metal processing state, R, irregularities, the difference in brightness may increase.

In that case, using a wide range (wide dynamic range) camera may make it easier to see.

 

We compared the high-sensitivity wide-range Full HD camera (BA200HD)adopted for our boothcope with our general-purpose video camera (GR-i700).

 

ビデオカメラ ビデオカメラ
Video Camera the high-sensitivity
wide-range Full HD camera

●Observation of a part of a small engine (structure with a threaded portion at the back of the cylinder)

ビデオカメラ ビデオカメラ

●Observe the straight tube part and thread part with a direct viewing type borescope

ボアスコープ ボアスコープ
Video Camera the high-sensitivity
wide-range Full HD camera

 

If there are R and unevenness in the metal part, the halation part and black part will be more.

When using a wide range camera, the range that can be observed spreads.

As shown in the figure above, the scope of observation of the screw portion at the back which has been difficult to observe with the conventional video camera has expanded.

Extension of video cable

There is no clear provision on the video cable like a USB cable.

 

If it is only the part of the video signal, I think that about 10 m is safe if it is an ordinary pincode (RCA terminal) as achievement.

If it is a coaxial cable (BNC terminal), it can transmit without feeling deterioration of about 100 to 200 m.

 

If you really want to use the RCA terminal, the terminals are sold as RCA terminal, the cable as coaxial cable, etc.

ビデオケーブル

External device that stores video signals

Video signals are general purpose video signals.

One of the advantages of using a video signal is that a wealth of external equipment can be obtained at a low price.

This time we will introduce some recorder.

(1) Conversion cable

It is a conversion cable introduced in “How to convert video signal to USB“.

Because it saves with software on PC side, still images and movies can be saved depending on software.

ビデオ

(2)Battery-driven recorder

It changed a bit, it is a battery-driven recorder.

It is made overseas but you can purchase it with Amazon etc.

You can save not only videos but still images.

The recording medium is this body. The record data is sucked up by PC with USB.

Since there is no output terminal, it can not output to the monitor.

記録器

(3)USB memory compatible video recorder with division function

The video signal recorder sold at our company can save both movies and still images.

It is a video recorder GRAV-1 with a division function compatible with USB memory.

The recording medium is a USB memory. You can save movies and still images.

It is also possible to save using an external trigger.

(It will be only still images. * It can be saved only for movie saving by special order correspondence.)

分割機能付き 画像保存
   

 

For video signals, video recording machines are mainstream.

When saving of still images is unnecessary, the number of options increases and the price becomes low price.

(4) Compact DVR

 Small DVR only for saving movies is sold at the site of burglar alarm equipment.

動画保存のみ

(5)Hard disk recorder

Many low-priced hard disk recorders are also on sale.

Long time recording is also suitable for video cameras.

We will introduce one hard disk recorder that can record for 2 months with monitor with long time recording.

ハードディスクレコーダー

(6)Skip back recorder

There is also a skip back recorder.

It records the image before and after the trigger is entered with a sensor etc.

スキップバックレコーダー

How to transmit video signal to USB?

The video signal is an extremely versatile video system.

Various external devices are also on sale.

Various items to convert to USB are also on sale.

Power supply is unnecessary, and it seems that many are small and inexpensive.

The bottom photo is about 4000 yen, but there seems to be some sold at around 2000 yen.

ビデオ

In the case of video signal (NTSC), the total number of scanning lines is 525 lines.

When converting to USB, it becomes about 640 X 480 (about 300 thousand pixels equivalent).

Recent USB cameras are commonly megapixels. Compared to them, the resolution is slightly inferior.

However, the frame rate is fast and the data capacity is small, it is suitable for storing moving images.

Distribution of video signal

Video signals may be distributed and used. (Using monitor and recorder)

When distributing the video signal, it can also be split into two using connectors and cables.

Many products are also sold.

ビデオ分配ケーブル ビデオ分割機
   

In this case the image deteriorates.

If you use a video distributor, you can basically distribute video signals losslessly.

●Split at connector → Degraded video ● Split at splitter → Basically undamaged
ビデオ分配ケーブル 分配機
   

<Wiring example>

The divider divides the video signal into two and outputs it to the video recorder and monitor

配線例

When recording with video microscope, how much can you record with 2G SD card?

When you record a movie on a 2 GB SD card using a video microscope, with a SD card compatible video recorder, it is possible to record about 1 hour.

SDカードビデオレコーダー

SD card compatible video recorder

GRSD-TV 3

※this is discontinued products. the current model is GRAV-1

If you would like to get further information, please do not hesitate to contact technical support.

Do you have any software that can play / fast forward / rewind / frame forward / slow play an saved AVI file using video microscope?

Video saved by SD card compatible video recorder handled by our company is AVI system.
You can take in that movie to PC and operate fast forwarding etc using software separately.

You can also change playback speed, fast forward, rewind, playback speed in Windows Media Player and with GOM PLAYER (free software). You can also play, fast forward, rewind and change the playback speed as well as frame advance too.

Please contact technical support for details.

Do you have any software that can play / fast forward / rewind / frame forward / slow play an saved AVI file using video microscope?