Microscopes/Projectors/Illumination units & Others

Microscopes/Projectors/Illumination units & Others

Type of TOOL SCOPE

1. Shape of lens-barrel
Cylindrical-shaft type (such as TS-I):
The lens-barrel (microscope tube) has an upright shape, in which the objective lens (objective) is in line with the eyepiece.
90-degree-tilt-angle type (such as TS-L):
The lens-barrel (microscope tube) is tilted at 90-degree angle, and the objective lens (objective) and eyepiece are angled at 90 degrees.
45-degree-tilt-angle type (such as TS-C):
The lens-barrel (microscope tube) is tilted at 45-degree angle, and the objective lens (objective) and eyepiece are angled at 45 degrees.
2. Products equipped with eye-piece body tube
(TS-I,TS-L,TS-C,TS-FL; as well as TS-VL and TS-WL which are also provided with TV lens-barrel (microscope tube).)
Included among them is the products equipped with an eye-piece which are used when conducting a visual check of a sample.
3. Products equipped with TV lens-barrel
(TV-IE,TV-LE,TV-ILC : as well as TS-WLC which are also equipped with eyepiece body tube)
Of all these products, there are products which are equipped with a C-mount used to fix CCD camera and so on in position.
4. Products with built-in lighting equipment
(TS-VLC,TS-WLC,TV-ILC and TS-FL)
Without requiring any lighting from an external source, their lighting equipment can be used independently.
There are two types of these products; one type is provided with a lighting unit (light) and another type is the one in which a lighting unit (light) is used separately and a beam of light is guided by a light guide of optical fiber.
5. Product that is able to use an eye-piece body tube like TV lens-barrel
(TS-TVA)
This product is intended to use a CCD camera, etc. with the use of TOOL SCOPE equipped with an eye-piece body tube you have already. If this product provided with C-mount is replaced with an eye-piece, an image from a CCD camera can be projected onto a TV monitor, etc.

Making a selection of TOOL SCOPEs

1. Selecting a proper TOOL SCOPE based on the required magnifying power
A proper objective lens should be selected based on the criterion as to how a sample should be magnified with the lens. The objective lens's magnifying power is a magnification ratio of the sample. The overall magnifying power can be determined by multiplying this power by the magnifying power of an eye-piece.
However, there are some cases where such an image that is magnified with the objective lens cannot be viewed entirely because it is limited by a field of view of the eye-piece.
Moreover, during use of a CCD camera, the whole image cannot be projected because it is limited by a size of its imaging surface.

■ As to whether a sample image should be visually confirmed or projected onto TV monitor:
When a sample image is checked with eyes, use a product with eye-piece body tube; or choose a product with TV lens-barrel when using a CCD camera to project such image onto a TV monitor, etc.
The product equipped with both the eye-piece and TV lens-barrel is also available.

■ What to do when you want to keep a lighting unit (heat source) away from a sample:
Select a product of light-guide type to keep the lighting unit itself which is a heat source away from the sample.

■ How to observe a sample:
For the product with built-in lighting equipment (lighting equipment of epi-illumination type), the illumination should be provided from the top of the sample via the objective lens.
An external lighting source is required if the sample cannot be observed well because of its surface and shape. However, there are instances in which illumination cannot be provided by a high-magnification objective lens because the sample comes closer to the front edge of lens.
2. What are required when using TOOL SCOPE
■ Focus adjustment mechanism:
With TOOL SCOPE, a focused image of sample can be obtained when the sample and the front edge of objective lens reach a specified distance (working distance).Because the main unit of TOOL SCOPE does not have any mechanism to bring an object in focus, a focus adjustment mechanism to match both distances of the sample and the front edge of objective lens with each other is required separately.
Note, however, that a working distance is determined by an objective lens used. The higher the magnifying power of the objective lens, the shorter the working distance becomes.
Various supporters are made available which function to hold TOOL SCOPE in place and additionally have the focus adjustment mechanism.

■ Illumination:
Illumination is required when observing a sample. Excluding those products with built-in lighting equipment, lighting needs to be provided from an external source. Also, when the illumination from the built-in lighting equipment is not sufficiently bright, external lighting is required.
As such external lighting, lighting of light-guide type, oblique lighting, ring lighting, etc. are available.
To keep the lighting equipment itself which is a heat source away from a sample, use the lighting of light-guide type, whereas this lighting of light-guide type should be selected as well when illumination intensity needs to be increased. Because the lighting of light-guide type provides oblique lighting where illumination is given from the surrounding area of objective lens, there are instances in which illumination cannot be provided by a high-magnification objective lens because the sample comes closer to the front edge of lens.


Table of combination of lens's magnifying power
Objective lens OB-05 OB-1 OB-2 OB-3 OB-5
Length of objective lens 41㎜ 21㎜ 21㎜ 21㎜ 21㎜
Working distance (W.D.) 350㎜ 165㎜ 71.5㎜ 34㎜ 13㎜
Eye-piece Actual field of view φ 36 ㎜ φ 18 ㎜ φ 9 ㎜ φ 6 ㎜ φ 3.6 ㎜
OC-10 Overall magnifying power 5 × 10 × 20 × 30 × 50 ×
Eye-piece Actual field of view φ 24 ㎜ φ 12 ㎜ φ 6 ㎜ φ 4 ㎜ φ 2.4 ㎜
OC-20 Overall magnifying power 10 × 20 × 40 × 60 × 100 ×


Objective lens OB-10 OB-20 LWD-5 LWD-20
Length of objective lens 29.5㎜ 35.5㎜ 81.5㎜ 31㎜
Working distance (W.D.) 6.5㎜ 1.5㎜ 45㎜ 5.8㎜
Eye-piece Actual field of view φ 1.8 ㎜ φ 0.9 ㎜ φ 3.6 ㎜ φ 0.9 ㎜
OC-10 Overall magnifying power 100 × 200 × 50 × 200 ×
Eye-piece Actual field of view φ 1.8 ㎜ φ 0.9 ㎜ φ 3.6 ㎜ φ 0.9 ㎜
OC-20 Overall magnifying power 200 × 400 × 100 × 400 ×


※Working distance: It is the distance between a sample and the front edge of objective lens when creating an image of the sample.
※Actual field of view: It is the range of a sample which can actually be observed. This value is determined by multiplying the number of eye-piece's fields of view (the range of an image of objective lens which can be observed with eye-piece) by the magnifying power of objective lens.
※The overall magnifying power is based on the combination of TOOL SCOPEs (mechanical tube length: 163 mm).

Reference information for "TOOL SCOPE" TV camera

▼Imaging surface and dimensions (informative reference)
Nominal dimension of imaging surface Height x Width dimension Diagonal dimension
1/4inch 2.4㎜×3.2㎜ 4㎜
1/3inch 3.6㎜×4.8㎜ 6㎜
1/2inch 4.8㎜×6.4㎜ 8㎜
2/3inch 6.6㎜×8.8㎜ 11㎜
1inch 9.6㎜×12.8㎜ 16㎜


▼Imaging surface and monitor, and electronically magnifying power (informative reference)
Imaging surface 1/4inch 1/3inch 1/2inch 2/3inch 1inch
Monitor's dimensions 5inch About 32 About 21 About 16 About 12 About 8
9inch About 57 About 38 About 29 About 21 About 14
12inch About 76 About 51 About 38 About 28 About 19
14inch About 89 About 59 About 44 About 32 About 22
15inch About 95 About 64 About 48 About 35 About 24

■Optical magnification: Ratio of size of image to size of sample
■Electronically magnifying power: Ratio of size of monitor screen to size of imaging surface of CCD camera, etc. Electronically magnifying power = Monitor size (diagonal) ÷ Size of imaging surface (diagonal)
■Monitor's magnifying power (Video overall magnifying power):
It is the magnifying power when the sample is seen on the monitor screen via lens.
Monitor's magnifying power = Optical magnification x Electronically magnifying power
Example) When the optical magnification equals 3 times and the electronically magnifying power equals 29 times,
the monitor's magnifying power will be equal to 3 x 29 = 87 times.
※TOOL SCOPE is a registered trademark of Chuo Precision Industrial Co., Ltd.
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