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How to integrate with binocular stereomicroscope?

When observing with a binocular stereomicroscope with both eyes, the objective lens is slightly oblique so that the object is close to the actual view.

(It is the same as looking at nearby objects with both eyes of a human.)

 

Therefore, looking at the following objects with one eye

 

 

You can see the side slightly. (In other words, you will be looking at diagonal.)

 

When the microscope is moved up and down, the field of view also shifts slightly.

The focus synthesis software is made on the premise that the field of view does not shift.
(It is assumed that it vertically moves up and down to the object)
If you use focus synthesis software with a stereomicroscope, it will blur like a photo below.

 

Mitani Shoji’s focal synthesis software (WinROOF 2018 Lite) has “microscope mode”.

Focus synthesis is possible without bleeding by focus synthesis using this function.

We also support these problems. Please feel free to contact us.

 

Of course, if you are a straight tube microscope like the one on the left, you can use normal focus synthesis software without problems.

MAGNIFICATION AND FIELD OF VIEW OF CAMERA FOR MICROSCOPE DEFINITIONS

When you observe the microscope with the naked eye, the field of view gets rounded.

(We are using glass scales in increments of 0.5 mm as test samples.)

 

 

 

When this is shot with a camera, it becomes a 4: 3 rectangle with enlarger size.

Besides that, the field of view will change depend on the magnification of the camera connection (connector lens), the size of the image sensor of the camera, and so on. (It will also be a red field of view and a blue field of view in combination.)

You can express this with monitor magnification. (You can also calculate.)

■Camera connection part is C-mount

If the camera connection part on the microscope is C mount, the C mount part also has magnification.

If you do not specify microscope, it seems that a C mount adapter of equal magnification (1 times) is often attached.

Monitor magnification = magnification of objective lens × magnification of C mount × (diagonal length of monitor / diagonal length of camera sensor angel)

 

1 / 2.5 inch camera (diagonal length of camera sensor angel is 7 mm)

19 inch monitor (diagonal angel 470 mm),

C mount part (equal magnification),

Objective lens 10 times

<Magnification caculation>　

10 times X 1 times X (470 mm / 7 mm) = 670 times

The field of view will be like the bottom picture.

 

 

Since the horizontal dimension of the 19 inch monitor is 370 mm. So, the image on the right spreads to the screen

<Measured magnification>

370 / 0.55 mm = 672 times

 

Magnification caculation (monitor magnification) and actual magnification are the same.

We need to reduce the magnification of C-mount in order to increase the field of view

We also offer equal size (standard equipment) and 0.5 times (option).

There are various magnifications when looking at other company’s catalogs.

■If you are connected to microscope by JIS len, the magnification can not be changed (equal magnification)

If you are connected a camera to this lens barrel, a relay lens is attached to the camera side. There is magnification in this relay lens.

 

Magnification calculation is as follows:

Monitor magnification = magnification of the objective lens × magnification of the connector lens × (diagonal length of monitor / diagonal length of camera sensor angle)

 

1 / 2.5 inch camera (image sensor diagonal 7 mm),

19 inch monitor (diagonal 470 mm)

Connector lens (0.45 times),

Objective lens 10 times

 

<Calculation magnification>

10 times X 0.45 times X (470 mm / 7 mm) = 302 times

Since the horizontal dimension of the 19 inch monitor is 370 mm. So, the picture on the right spreads to the screen then:

<Measured magnification>

370 / 1.2 mm = 308 times

Magnification caculation (based on magnification on monitor) and actual magnification are the same.

Our company has 0.45 times and 0.37 times connector lens available.

We’ll advise the suitable one to the customer according to the size of the image sensor of the camera.

What’s the difference between optical microscope magnification and digital microscope magnification?

The magnification of the optical microscope and the magnification of digital microscope are very different.

The magnification of optical microscope is absolute magnification, even if the manufacturer differs, if the magnification is the same, it will be in the same field of view. (It is an absolute magnification.)

However, for digital microscope, the field of view will be very different depending on the manufacturer even at the same magnification. (Relative magnification.)

■Optical Microscope magnification

The magnification of the microscope is calculated by the following formula.

Optical magnification = (magnification of the objective lens) × (magnification of the eyepiece) Magnification of the microscope = optical magnification.

(In the case of the microscope of the bottom photograph, the magnification becomes 10 times the magnification of the objective lens × the magnification of the eyepiece 10 times, the optical magnification becomes 100 times.)

顕微鏡の倍率

 

Even in the case of a microscope, when the camera is attached to microscope, it may be expressed including the monitor magnification.

(Refer to “How to calculate magnification of camera for microscope”.)

■Digital Microscope magnification

Taking an example of a microscope with an objective lens, which is easy to understand.

Firstly, the calculation of optical magnification is the same as the microscope.

Optical magnification = (magnification of the objective lens) × (magnification of the lens)

(In the microscope of the below picture, the magnification of the objective lens is 10 × magnification × 2 times the magnification of the lens body, the optical magnification is “20 times.”)

マイクロスコープの倍率

 

However, the monitor magnification is shown here.

Overall magnification = monitor magnification × optical magnification.

If the image sensor size is 1/2 inch and the monitor is 17 inches, the monitor magnification is 54.

(Please refer to “magnification of microscope”.)

Overall magnification = monitor magnification × optical magnification = 54 × 20 = 1080 times.

In conclusion, if the monitor size or image sensor size changes, the magnification will also change.

(Looking at the catalog of each manufacturer, there is a note such as “Equivalent to” ○○ inches monitor “

< Magnification definition>

Computing is complex, but the way of thinking is simple.

Microscope as shown below with 1mm on the display to 40mm.

This is simply 40 times.

倍率の考え方

 

 

Summary: 

 

The magnification concepts of a microscope and a macro lens are different and not interchangeable.

 

The magnification of a microscope is calculated as: 

Optical Magnification = (Objective Lens Magnification) × (Eyepiece Lens Magnification).

 

The magnification of a macro lens is calculated as:

Optical Magnification = (Objective Lens Magnification) × (Lens Body Magnification).

 

In the case of a microscope, the overall magnification includes the consideration of monitor magnification in addition to the optical magnification.

 

Total Magnification = Monitor Magnification × Optical Magnification.

 

Temperature Screening Handheld Thermography DS-2TP31B-3AUF

●Without a laser pointer, you can safely measure body temperature.

●Inspection can be performed more than 1m away.

●It is set in a narrow range of 30 ° C to 45 ° C for body temperature measurement and can measure with high accuracy of ± 0.5 ° C

●You can quickly measure body temperature in real time.

 

※60 people can be inspected in 1 minute.
※This thermography is not a medical device.

 

Features

●Resolution：160×120

●Thermographic accuracy：±0.5℃
●2.4 inch LCD display with 320 x 240 resolution
●Built-in rechargeable lithium battery
●Can be used continuously for up to 8 hours

 

Function

Thermography: Real-time temperature detection and display on the screen.

Save: Equipped with a MicroSD card for saving captured images.

2020 LUNAR NEW YEAR HOLIDAY

 

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

 

– Our office will be closed from Thursday, 23rd January 2020 to Sunday, 02nd February 2020

– Business operation will resume as normal on Monday, 03rd February 2020

 

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

 

2019-2020 NEW YEAR HOLIDAY

 

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

 

– Our office will be closed from Saturday, 28th December 2019 to Wednesday, 01st January 2020

– Business operation will resume as normal on Thursday, 02nd January 2020

 

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

 

Hanoi branch

 

We would like to inform you that as of June 3, 2019,
our Hanoi branch will open to the following location:

 

Hanoi office:

< English >
No.202, Y2 Building, HH04 Block, Viet Hung Urban Area, Giang Bien Ward, Long Bien District, Ha Noi City

 

< Vietnamese >
Phòng 202, Tòa nhà Y2, Khu HH04, Đô thị Việt Hưng, Phường Giang Biên, Quận Long Biên, TP. Hà Nội

 

TEL: +84(24)3200-3790

 

Announcement of Moving Our Office

We would like to inform you that as of May 2, 2019, our office will move to the following location:

 

New address:
＜English＞
5 Floor, 178/8 Nguyen Van Thuong Street, Ward 25, Binh Thanh District, Ho Chi Minh City

＜Vietnamese＞
Lầu 5, 178/8 Nguyễn Văn Thương, Phường 25, Quận Bình Thạnh, TP. Hồ Chí Minh

TEL: +84(28)3911-2006 FAX: +84(28)3911-2007 (unchanged)

 

We are sorry for the inconvenience this may cause you, and your understanding and cooperation are appreciated.

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

■ Direct Observation of the Cuticle

Even when observing hair at higher magnification, the cuticle might still be difficult to discern. It tends to appear merely as an enlargement of dark particles.

Observation with Ring Illumination

リング照明で観察

 

When using ring illumination, particularly with a “coaxial illumination high-magnification type,” visibility might improve slightly. However, it would also require higher lens resolution.

  1. General High-Magnification Microscope (Coaxial Illumination)
  • Ultra-High Magnification Microscope NSH130CS-R, Set price around 500,000 yen
  • While it’s a general-price microscope, it possesses lower lens resolution (coaxial illumination).

超高倍率マイクロスコープ　NSH130CS-Rで観察

 

  1. High-Resolution, High-Magnification Microscope (Coaxial Illumination)
  • Ultra-High Magnification High-Resolution CCD USB Microscope USH130CS-H1, Set price around 1.4 million yen
  • A microscope with higher lens resolution, offering ultra-high magnification (coaxial illumination).

超高倍率高解像度 CCD USBマイクロスコープ　USH130CS-H1で観察

 

  1. Metallographic Microscope
  • Metallographic Microscope GR3400J, 210,000 yen (excluding tax)
  • This microscope functions as a coaxial illumination microscope. While it’s not its intended use, the cuticle is distinctly visible. It might offer the best cost-effectiveness if observing only the cuticle.

金属顕微鏡　GR3400Jで観察

Observation with Metallographic Microscope GR3400J

To capture images like those shown below, an electron microscope would be necessary, which typically costs at least 6 million yen or more. (Note: We do not handle electron microscopes.)

 

電子顕微鏡

■ Cuticle Observation Image Comparison

  • Metallographic Microscope + Microscope Camera at 400x magnification

金属顕微鏡　＋　顕微鏡用カメラ　400倍

 

 

Ultra-High Magnification Microscope (USH3130CS-H1) at 800x magnification

 

超高倍率マイクロスコープ（USH130CS-H1)　800倍

 

 

■ Indirect Observation of the Cuticle

Directly observing the cuticle using a biological microscope is not possible. However, utilizing the “Swamp Method” allows for indirect observation.

Prepare a “Swamp Solution” and a “Swamp Board.”

Place the hair on the Swamp Board, apply the Swamp Solution, and let it sit. The surface of the hair will transfer onto the Swamp Board.

Observation with a Biological Microscope

Below are photos taken by our company using the Swamp Method for cuticle observation.

「スンプ液」と「スンプボード」

 

キューティクル観察をスンプ法で行った時の写真

 

 

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.

超高倍率USBマイクロスコープ Super High magnification USB microscope
SH350PC-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.

 

スンプ法を使用し透過照明法で観察 Super High magnification USB microscope
SH350PC-2R
Observe at 600 times

Observation with transmission illumination method using the Sump method

２．Observation with metal microscope

GR3400J（金属顕微鏡）

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をかける前の映像

 

Image after unsharp mask is applied

アンシャープマスクをかけた映像

 

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

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

 

Furthermore, by utilizing our proprietary real-time image processing software, REAL Effect, it becomes possible to apply contour enhancement processing in real-time while viewing the video, allowing enhancement up to the necessary level.
 
 

 

リアルタイム画像処理ソフト REAL Effec

Tips for observing glossy R section

光沢のあるR部

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

光沢のあるR部

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

光沢のあるR部

 

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
光沢のあるR部
   
Using a diaphragm lens further increases the depth of focus and makes observation easier.
＜Open the aperture＞ ＜Close the aperture＞
絞り開放している時 絞りを絞っている時

 

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 乾電池のエッジ
   

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

  
Open the aperture Close the aperture
絞りを開放にした場合 絞りを絞った場合
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
背景色が黒の場合 背景色が白の場合
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 5 Solder part>
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 6 in the case of actually applying polarized light 6

Object in which high reflectance part and low reflectance part coexist>
ハレーション抑制前 ハレーション抑制後
<Before suppression of halation> <After suppression of halation>
<Actual Example of Actual Polarization 7 Printing on Film>
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 8 Object in a plastic bag>
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 9 Convex character of white resin (embossed part)>
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>
   

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>
ハレーション抑制前 ハレーション抑制後
<Shooting in normal mode> <Shooting in HDR mode>
   
ハレーション抑制前 ハレーション抑制後
<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

 

φ1.8mmのドリルの刃先 Drill cutting edge of φ 1.8 mm
   
<Example 1>  
ドリルの刃先　観察例1

(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　観察例2

(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　観察例3

(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.
  背景の白色の紙をV字にする
   
＜Example 4＞  
ドリルの刃先　観察例4

(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)
  ハレーション除去セット
   
＜Example5＞  
ドリルの刃先　観察例5

(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.
  アーチ型照明
   
＜Example6＞  
ドリルの刃先　観察例6

(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　観察例7

(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　観察例8

(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　観察例10

(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))
ハレーション抑制機能（明るさ平均機能（HDR機能））が付属しているCマウントカメラ  
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.

 厚み測定
   
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

 厚み測定
   

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)
インジケーター
   
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)
   
We have two kinds of stand with digital indicator (height gauge) available.
インジケータ付粗微動スタンドインジケータ付粗微動スタンド

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.)
高さ測定（Z軸測定）システム 高さ測定（Z軸測定）システム
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画像を作成
3D画像を作成　3D画像を作成

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映像

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

The following yellow line is a optional drawn.
任意の寸法、断面形状
   
治具

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.

ワッシャーの外径測定例

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

4. Reset the digital micrometer to zero.

デジタルマイクロメータをゼロリセット

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

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

マイクロメータを使い、もう１箇所の端面まで移動マイクロメータの値が外径になります

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.

 

変換アダプタ 変換アダプタ
   

Flange back of EOS is 44mm

EOSのフランジバック

Flange back of C mount is 17.526 mm

Cマウントのフランジバック

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.)

 

 

変換アダプタ

 

By employing this adapter, it is feasible to physically affix a C-mount lens to a single-lens reflex (SLR) camera. Nevertheless, SLR cameras typically exhibit a significantly larger sensor size compared to industrial cameras.

 

Consequently, the inherent incompatibility of C-mount lenses with the fundamental sensor dimensions of SLR cameras renders such a recommendation impractical.

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.

NA（開口数）

 

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

However, it becomes larger and more expensive.

NA（開口数）