Easily observe the sides of the hole!
●Show off its true potential when combined with a camera!
●Just attach a 70° or 90° mirror tube and you can rotate it around!
●Can be used as a direct-view high-magnification borescope without the mirror tube
●Compatible with various lighting such as M10 P=0.5 and M8 P=0.5
Thank you so much for supporting Shodensha Vietnam.
Shodensha Vietnam is pleased to announce our schedule of Vietnam ‘s National Day Holiday as follow:
Please notice that our service will not be available during Holiday time.
Best regards.
Flat dome lighting is suitable for defect detection on curved products, surface inspection of metal products, and print inspection on irregular surfaces such as bumps. When combined with a polarizing filter on the lens, the impact of halation can be reduced, allowing for clearer observation in some cases.
● The degree of wear on drill bits
● Scratches and foreign objects in fibers
● Cracks in the bent section (marked area) of the processing
In all cases, normal ring lighting results in intense halation and reflections that obscure certain areas from view.
Switching to flat dome lighting with polarization improved visibility, but further enhancements were achieved by attaching a polarizing filter to the lens.
As measures to suppress halationare common approaches:
・ Using a monochrome camera
・ Attaching polarizing filters to both the lens and lighting
The advantage of this method is the use of a color camera and the installation of only a single polarizing filter on the lens, which allows the colors seen on the monitor to closely resemble those of the actual object, enabling observation without any color mismatch.
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Flat dome lighting DC-30D series |
We frequently receive requests to inspect burrs and foreign objects inside holes using transmitted lighting.
This task requires a bit of finesse, especially when the object in question has some thickness.
For instance, we conducted a test by drilling a 5mm diameter hole in a 12mm thick aluminum plate and photographing the result.
In the photograph above, foreign objects are adhered to the top (surface), middle, and bottom (near the base).
| To detect all of these, it is necessary to use a lens with an adjustable aperture. |
■ When using a lens with an open aperture
When focusing on the top (surface) with an open aperture lens, the observation appears as follows.
＊The middle (intermediate) and bottom (near the base) sections become almost invisible.
When focusing on the middle section with an open aperture lens, the observation appears as follows.
＊The top is visible but appears thinner, while the bottom is very difficult to see.
■ When using a macro lens with an aperture control
Shoot with the aperture as closed as possible. (Compensate for the resulting darkness with lighting, and keep the camera’s gain at about 90% instead of maximum.)
＊The top (surface), middle, and bottom (near the base) can all be sufficiently observed.
Summary
To observe burrs and foreign objects inside holes, it is necessary to use not only transmitted lighting but also a lens with an adjustable aperture that can increase the depth of field.
We will introduce how to use our transmitted lighting (RD-95T).
The RD-95T is circular with a diameter of 95mm.
The cable is drawn from the center. The rubber feet are detachable.
(Attaching the rubber feet allows it to stand independently.)
(1) If the base is equipped with a 95mm observation plate, remove the plate and fit the transmitted lighting into place.
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Since the back of the transmitted lighting lacks mounting holes or screws, use the side screws of the base for securing it.
(2) Alternatively, place it under the base in a standing position (with rubber feet attached).
Attach an observation glass plate to the base.
Using the RD-95T transmitted lighting, you can add transmitted lighting to stands that do not have it.
This lighting can be attached to microscope stands, microscope stands, and XY tables that are equipped with a circular observation plate with a diameter of 95mm.
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| This lighting has cables extending from the back, so it cannot stand on its own as is.
Therefore, by attaching rubber feet as described below, it can be made to stand independently for use. |
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These rubber feet are not specialized items; they are generally available for sale as described below.
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| Attaching 10mm rubber feet (as mentioned above) to this transmitted lighting will result in a total thickness of 23mm. | ||
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＜Usage example＞ |
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Low-angle LED lighting is effective when you want to emphasize edges or observe slight unevenness.
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<When observed using LED ring lighting>
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<When observed with low-angle LED lighting>
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Low-angle lighting allows for obtaining images where the edges of a one-yen coin are emphasized.
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<When observed using LED ring lighting>
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<When observed with low-angle LED lighting>
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When observing minor protrusions and indentations, objects that are not clearly visible with LED ring lighting may be clearly observed with low-angle LED lighting.
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Low-angle LED ring lighting VLR-75D series |
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Low-angle bar LED lighting (Please inquire about custom orders as well) |
We can accommodate custom orders tailored to your specific needs, so please feel free to contact our technical support.
Among the lighting devices we handle, only the following LED light sources can be dimmed through external control:
(These are not our original products, but are manufactured by Hayashi Repic Co.)
The coaxial type has the same coaxial lighting and tip shape as ours, allowing for replacement.
By altering the shape of the fiber at the tip, it can be used for coaxial lighting, transmitted lighting, and ring lighting.
Transmitted lighting type fiber
The high-magnification zoom lens designed for coaxial illumination (SDS-Z) includes a standard 1.5x auxiliary lens.
Removing this lens allows for the installation of ring lighting.
＊However, the magnification will change from 65～350x → 45～270x
the working distance will extend from 52mm → 95mm.
Coaxial illumination can still be used, allowing you to change the lighting based on the object being observed.
■ On the LED side, remove the diffusion plate and attach a polarizing filter.
■ On the lens side, after attaching the ring lighting fixture, a filter can be mounted at its tip.
The back of the bar LED features tripod screws for mounting.
Various options are available for sale, compatible with standard camera specifications.
(Example)
The red section represents the tripod screw, while the blue section denotes the shoe (slide mount) area.
The photo below is not of a wall, but by using a plate with a shoe attachment, the LED can be mounted.
By securing a “shoe” attachment to a wall or plate as shown below, you can mount the bar LED in that location.
Various types of mounting hardware are available for sale.
Shodensha Corporation offers two types of bar lighting.
Please see the product details below.
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Bar LED lighting LED-BL |
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Bar LED lighting（double, 10cm） Bar LED lighting LED-BL10-CH2 LED-BL |
The characteristics of macro lenses are:
・They have a fixed focal length, and the focal length is short,
・The focal length is relatively short.
Therefore, the focus is adjusted by moving the camera body up and down.
＊The lens size also tends to be relatively large.
For the reasons mentioned above, it is common to attach lighting to the tip of the lens.
CCTV lenses and similar types allow for focus adjustment on the lens side.
In other words, the focal length is variable.
Additionally, compared to macro lenses, the focal length is longer.
Therefore, the lens is detached to install the lighting.
(This ensures that even if the focal length of the lens changes, the position of the lighting does not change, resulting in a consistent appearance.)
It is fixed using various types of stands.
It would look something like this.
| We will introduce two types of ring lighting.
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| Space-saving LED lighting LED-16
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Small diameter 40 light LED ring lighting LED-40
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| Outer diameter φ48mm Inner diameter φ15mm
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Outer diameter φ63mm Inner diameter φ27mm
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16-light Flat configuration (The LEDs are angled at 0°, facing directly downward.)
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40-light Direct configuration (The LEDs are angled.)
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| Dimmable
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Dimmable
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| ＜Method of attachment＞ | ＜Method of attachment＞ |
| Exclusive for M28/M42 (M42 is a standard known as T-mount.) |
M28 female thread Uses three fixing screws |
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Small diameter lenses are fixed using M28. |
Small diameter lenses are fixed using M28. |
The standard lens (SDS-M) is fixed using M42. |
The standard lens (SDS-M) is fixed using three screws. |
If the position of the lighting does not change even if the focal length of the lens changes, the appearance will remain constant.
We will show you how to attach the lighting separately from the lens.
It is fixed in place with various stays.
It will look like the image below.
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In the case of long-distance lenses, the working distance becomes considerably extended. When adding illumination to the lenses of microscopes or stereomicroscopes, there is often insufficient light intensity.
＊The working distance for microscopes and stereomicroscopes is approximately 100mm. |
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| If using ring illumination, it is necessary to position the ring light closer to the object. (Depending on the size of the object and the required working distance.) | ||
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Additionally, there are other methods as described below.
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Twin-arm lighting mounted on a post Low-cost flexible LED spot lighting GR-FL21 |
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| Fixed-type twin-arm lighting Slim twin-arm lighting for microscopes SPK-D1 |
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| Bar LED lighting *Bar LEDs are also available in modular types.
Bar LED lighting LED-BL
Basic stand set for bar LED lighting
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When you need to increase the distance, you can use methods such as employing a condensing lens.
It is also possible to combine a magnetic stand with a condensing lens.
Magnetic twin-arm lighting MGSPF-D2
Our coaxial illumination USB microscope, model Z500CS, comes standard with a 1.5x auxiliary lens.
This time, I observed the metal part of a USB memory stick.
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Observation using a 1.5x auxiliary lens (basic specification)
The focal length, magnification, and field of view at this time are as follows: |
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When observing at low magnification, removing this 1.5x auxiliary lens will reduce the magnification.
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Remove the 1.5x auxiliary lens.
The focal length, magnification, and field of view at this time are as follows: |
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If you wish to observe at an even lower magnification, attaching a 0.75x auxiliary lens will further reduce the magnification.
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Attach the 0.75x auxiliary lens.
The focal length, magnification, and field of view at this time are as follows: |
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At the lowest magnification of 35x with the 0.75x auxiliary lens, the coaxial illumination becomes unbalanced and cannot be used.
Therefore, it is practical to observe at the lowest feasible magnification of 45x by removing the standard 1.5x auxiliary lens.
For details on the “Coaxial Illumination USB Microscope” and “0.75x Auxiliary Lens” used this time, please refer to the product pages below.
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Coaxial Illumination USB Microscope Z500CSLT |
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0.75x Auxiliary Lens (For FZ series Microscopes, SDS-FZR model) Z-0.75 |
The high speed camera at astonishing low price!
High speed cameras are not that difficult to use.
Let’s start by using this entry level high speed camera and leave some evidence.
| ●Low cost slow motion camera ●240 fps (frames per second) at a resolution of 1440 x 1080 effective pixels ●Records slow motion videos in H.264 compressed or uncompressed format. ●You can control the start and stop of recording using a timer. ●Records directly to your PC’s M.2 SSD. ●A lens is required separately. |
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●Ideal for inspecting the inside of holes
●Fisheye lens with deep depth of field
●Can be extended in 10cm increments (up to a maximum of 100cm)
Epi-illumination is suitable for observing diffusely reflecting objects.
Coaxial illumination is suitable for observing flat specularly reflecting objects.
(Even with specular reflective objects, tapered parts and large uneven parts cannot be observed.)
So what about things that aren’t completely diffuse reflectors?
We often explain to our customers that coaxial lighting is suitable for objects that are at a level where their faces can be seen.
| <Iron block> | <Aluminum plate> |
| (No plating, polishing, etc.) | (Alumite processing, shot processing) |
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| Ring lighting allows for clearer observation. Using coaxial lighting The image will be unclear. |
This sample does not show faces. Observation is possible with coaxial lighting or ring l ighting. Both are usable boundary samples. |
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| ring lighting | ring lighting |
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| coaxial lighting | coaxial lighting |
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1. Applications not suitable for coaxial illumination:
Observing with coaxial illumination results in loss of color and creates images with no contrast.
(2) Objects with gloss but uneven surfaces
Only the flat portions of the object will shine, while other areas will appear as images without contrast.
Coaxial illumination is suitable for objects with gloss and flat surfaces.
It is suitable for the following examples:
Depending on the object, some are suitable for coaxial illumination, while others are more appropriate for ring illumination.
However, ring illumination is more versatile.
Coaxial illumination can only be used for objects that are “glossy” and “flat.”
■Features of Coaxial Illumination
Coaxial illumination is a suitable method for objects with specular reflection (glossy surfaces).
When oblique light, such as from ring illumination, is directed at a specular object, it reflects at the same angle as the incident angle, preventing light from returning to the lens and resulting in a dark image.
However, coaxial illumination is not suitable for glossy objects with uneven surfaces or curvature.
When used on diffusive reflective objects, coaxial illumination causes only the central part to become bright (hotspot), resulting in a foggy image without color contrast.
The illumination method of a metallurgical microscope (coaxial illumination) is designed for nearly mirror-like, flat objects.
The appearance can significantly differ compared to conventional illumination (ring illumination).
White and black completely invert.
(The closer the surface is to a mirror finish, the more pronounced this effect becomes.)
A silver-plated coin, like the one in the above photo, can be observed with both coaxial and ring illumination.
(Since it is not a perfect specular reflector, both methods are suitable.)
A 10-yen coin cannot be observed with coaxial illumination.
Diffuse reflectors cannot be observed with coaxial illumination.
Perfect specular reflectors (those close to mirror surfaces) cannot be observed with ring illumination.
When using coaxial illumination, please note that diffuse objects cannot be observed.
(Even with metals, black anodizing or paint may be better observed with ring illumination.)
**Ring Illumination**
This provides the most natural appearance, closely resembling the view perceived by the human eye.
For more details on ring illumination, please refer to the following:
**Coaxial Illumination**
When observing reflective objects (such as metals), black and white may reverse depending on the conditions.
For more details on coaxial illumination, please refer to the following:
**Low-Angle Illumination**
Edges appear sharper and more pronounced, resulting in a dark-field-like appearance. (Refer to “Dark-Field Observation” for more information.)
For more details on low-angle illumination, please refer to the following:
As a premise, it is assumed that the desired wavelength is included within the wavelength range of the white LED.
Below is the typical wavelength distribution of a white LED. It is believed to be applicable in the range of approximately early 400nm to 650nm.
By attaching a band-pass filter to this illumination, it will emit light at specific wavelengths.
For example, if you use the filter indicated by the red arrow below, the light will peak at around 490nm, resulting in blue light.
Although we do not have such equipment, there are general LED illuminations available that can accommodate filter attachments.
Below is a model of white LED illumination from Hayashi Repic Co., the HAD-TW3. (Filters can be attached to the tip of the illumination.)
The NSH500CSU comes with a standard simple XY table, but it does not support transmitted illumination. Here, we will introduce a method to attach transmitted illumination.
**Pattern 1**
Attach rubber feet to the RD-95T and place it on the standard included XY stage (TK100).
This method allows for the easy introduction of transmitted illumination without the need for modifications, but the size of the specimen is limited to the dimensions of the RD-95T (φ95).
While the rubber feet prevent slipping, the lighting unit may shift due to impacts such as accidental hand contact.
**Pattern 2**
Replace the rotating simple XY stage, remove the observation plate, and insert the RD-95T.
The RD-95T can be fitted into the XY table, providing a certain degree of stability. However, since the cable needs to be routed outside, it is necessary to drill a hole of approximately φ10 in the base. Our company can perform this drilling free of charge prior to shipment.
Ánh sáng có thể nhìn thấy được bằng mắt người được gọi là ánh sáng khả kiến. Thông thường, ánh sáng khả kiến nằm trong khoảng từ 380nm đến 750nm. Bước sóng ngắn hơn thuộc về tia cực tím, trong khi bước sóng dài hơn thuộc về tia hồng ngoại.
Màu sắc của ánh sáng thay đổi theo bước sóng. Vì không có nguồn sáng nào hoàn toàn đơn sắc, nên màu sắc thực tế thay đổi dựa trên bước sóng ánh sáng nào mạnh nhất trong phổ.
Các loại đèn không chỉ dùng để chiếu sáng mà còn dùng cho các thí nghiệm phát quang thường được bán với bước sóng đỉnh được quy định rất chi tiết.
Trong các thí nghiệm phát quang đơn giản hoặc kiểm tra dây chuyền sản xuất, đèn cực tím (blacklight) thường được sử dụng. Đèn cực tím phát ra tia UV sóng dài, chỉ có thể nhìn thấy được một phần nhỏ bằng mắt thường.
Ánh sáng phát ra từ thiết bị chiếu tia cực tím của công ty chúng tôi có giá trị đỉnh là 365nm, đèn LED màu vàng là 589nm, đèn LED màu đỏ là 624nm, và đèn LED màu xanh là 463nm.
The equation is correct: E(θ)=E0(cosθ)4E(\theta) = E_0 (\cos \theta)^4.
As you move away from the center, the illuminance drops steeply:
In practical lighting scenarios, the diffusion (or conversely, directionality) of light sources varies, resulting in diverse beam characteristics that may not perfectly align with theoretical values. However, they serve as rough guidelines.
To achieve uniform illumination over a certain area, efforts are made to utilize the central region (the “redder” area) as much as possible and to flatten out its characteristics as much as feasible. This can be achieved by using lenses, diffusers, or other optical elements.
It’s important to note that with point sources (such as small area illuminations), achieving completely uniform illumination across a large area is generally not possible.
Summary:
**ルーメン (Lumen)**: Indicates “how much light is gathered within a certain range from the light source.” It quantifies the luminous flux within a specified angle of emission, regardless of the measuring surface conditions.
**ルクス (Lux)**: Indicates the brightness of a “specific surface” illuminated by light and varies with the measurement distance. It is commonly used for lighting devices where brightness at a certain distance and on a specific surface (lux) is important.
These metrics help in understanding and quantifying the brightness and efficiency of lighting sources and devices.
White LED products are available in a variety of chromaticity ranks.
Monochromatic LEDs are expressed by wavelength (peak wavelength), but white color is a mixture of colors, so chromaticity is expressed by
Color temperature (Kelvin (K)) is often used as an indicator.
There are various types of white, such as “bluish”, “yellowish”, and “reddish”.
For consumer products such as lighting, the standards established by the American National Standards Institute (ANSI) are
It is used a lot.
For convenience, the ANSI standard divides white into eight types based on color temperature.
White with a low color temperature is a slightly reddish white (warm color) similar to that of a light bulb.
It is around 2700K.
White with a high color temperature has a slightly bluish tinge (cool color), like the sun at noon.
It is around 6500K. This period is classified into 8 types.
Although there is no regulation in ANSI for 6500K or higher, it is recommended for industrial use and LCD backlights.
There are many products.
The following is an excerpt from a catalog for a certain lighting device.
There is a runup up to 10000K.
White color is represented by color temperature, and monochromatic color is represented by wavelength.
This method involves illuminating the sample and observing it solely through scattered and reflected light from the sample itself. The sample appears illuminated against a dark background. It is suitable for detecting scratches on glass, lenses, mirror surfaces, fine steps, and foreign particles.
Summary:
Dark-field observation involves illuminating the sample and observing it solely through scattered and reflected light.
However, with dark-field observation, the available light intensity is quite limited, and it becomes unusable at slightly higher magnifications.
Therefore, a recommended method is to use low-angle LED ring illumination with a black background.
Calibration, misconfiguration, reproducibility…
Solve all your measurement problems!
Magnification is 20~165x (CT200HD-50TD/ 40~330x (CT200HD-H50TD)
※ Calculated value for a 21.5-inch monitor
※ A monitor is not included.
You can do all without a PC!
Highly functional integrated microscope
Solve all your measurement problems!
*Monitor is not included.
| The key point! |
●Variable magnification lens allows automatic image dimension measurement over a wide field of view!
●Easy! Automatically measure image dimensions with just a click
Computer is not included.
| The key point! |
●Magnification can be changed by using a zoom lens!
●Easy to use! Automatically measure dimensions in the image with just a click.
PC not included.
| The key point! |
●The use of double-sided telecentric lenses enables highly accurate automatic image dimension measurement!
●Easy to use! Automatically measure dimensions in the image with just a click.
PC not included.
| The key point! |
●Variable magnification lens allows automatic image dimension measurement over a wide field of view!
●Dimensional measurements are manual.
PC is not included.
| The key point! |
●Magnification can be changed by using a zoom lens!
●Dimensional measurements are manual.
PC is not included.
| The key point! |
●The use of double-sided telecentric lenses enables highly accurate automatic image dimension measurement!
●Dimensional measurements are manual.
PC is not included.
Dome lighting is an illumination device that illuminates objects with indirect light from various directions. Unlike ring lighting, which can cause irregularities, reflections, and halation on uneven objects such as convex and concave surfaces, dome lighting can provide soft indirect light.
– It can emphasize points you want to detect while maintaining uniformity on the surface.
– It also helps in reducing halation effects by averaging the brightness of the surface rather than eliminating halation itself.
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| Dome lighting DC-170W | Dome lighting dedicated mounting angle LDM-A2 |
| ●● Illuminating the surface uniformly to emphasize detection points
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| １. Backside of spray can (R shape)） | 
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| <Observation with regular ring illumination> | <Observation with dome lighting> |
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| 2. Underside of a PET bottle cap
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| <Observed with regular ring illumination> | <Observed with dome lighting> |
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| 3. Printing on aluminum sheet | 
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| <Observed with regular ring illumination> | <Observed with dome lighting> |
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| ● Effectiveness in reducing halation
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| １.Screw
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| <Observed with regular ring illumination> | <Observed with dome lighting> |
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| 2. Metal band of a watch | 
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| <Observed with regular ring illumination> | <Observed with dome lighting> |
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| 3. Threads inside a pipe
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| <Observed with regular ring illumination> | <Observed with dome lighting> |
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| 4. Metal surface
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| <Observed with regular ring illumination> | <Observed with dome lighting> |
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It’s one of the lighting methods used in microscopes and digital microscopes. This method involves illuminating from behind the object, also known as backlighting.
There are different types such as edge-type (reflecting off the wall surface) and direct-type (directly illuminating in a vertical direction).
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Edge lighting
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Direct lighting
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merit
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demerit
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| Edge lighting |
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Compared to direct lighting, Illumination intensity decreases. |
| Direct lighting | It can emit high-intensity light. (Ideal for pinhole inspection, etc.) |
Due to its substantial thickness, it often exerts influence on the W.D. |
Transmitted illumination can be applied to the following observations:
– Emphasizing the edges of objects for dimensional measurements and defect checks.
– Pinhole checks on films and similar materials.
– Nozzle blockages.
– Confirming crystals in aqueous solutions.
Combining an XY table with transmitted illumination for dimensional measurements
<Instrumentation Used>
Transmitted illumination RD-95T, XY table TD100-25MX with digital micrometer
Using a transmitted illumination stand for detecting pinholes in films
<Instrumentation Used>
Transmitted illumination stand GR-STD8
・Nozzle clogging
| Only incident illumination |
Combining incident and transmitted illumination |
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We offer stand-type and surface illumination-type transmitted illumination systems at our company.
| Stand-type (direct type) | |
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Transmitted illumination stand (lamp type) GR-STD8 |
| 面発光タイプ（エッジ型） | |
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透過照明（面発光） RD-95T
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（面発光透過照明と回転式XYテーブルの組合せ） |
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For simpler applications, a commercially available photo negative observation backlight can sometimes be substituted. These typically cost around 10,000 yen, but they have low light intensity and limited adjustability.
Place the transmitted illumination (RD-95) underneath a compact stand.
On top of this, install a glass XY table (TK-100N).
This creates a simple transmitted illumination stand.
The size of the rotary table matches that of the transmitted illumination (RD-95).
By removing the observation plate from the rotary table and installing the transmitted illumination (RD-95), you create a simple transmitted light stand.
Of course, when using a rotating XY table, similar to (1), you can place the transmitted illumination underneath the stand. You can also use a glass plate on the rotating table to create a transmitted illumination stand.
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Transmitted illumination stand compatible type TK100-N (Stage: Glass) |
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Rotating simple XY table T |
