JPH1062307A - Photographing device and photographing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a photographic device and photographic method capable of using the whole area to be photographed as it is as a matter to be inspected (judged) without taking the image of a lens or camera itself. SOLUTION: In a photographing device 100 for photographing a sample 110 by a television camera 120 which is used in an inspection device, the camera 120 and a sample stage 150 are provided in such a manner that the sample surface is parallel to the light receiving surface of the camera 120, and the optical axis of the lens 123 of the camera 120 is vertical. to the sample surface. The lens position for receiving a light of the camera is set on the outside of the area formed by a vertical line vertically raised on the surface of a sample from the whole circumference of the area to be photographed of the sample.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographing apparatus and a photographing method used for inspection and observation of glass, resin, film, color filters for LCDs or industrial products obtained by processing them.

[0002]

2. Description of the Related Art Conventionally, a sample is photographed using a television camera to observe the state of the sample on a television monitor or automatically inspected by image processing. Generally, the specimen is photographed as shown in FIG. It had been. In this method, as shown in FIG. 3, a sample (such as a color filter for LCD) is placed on a sample mounting table 350, and the sample surface and the image forming surface 32 of the camera 320 are placed.
3 is parallel, and the image is taken with the optical axis of the camera 320 being perpendicular to the sample surface. In this method, the lens 121 and the camera 120 themselves are placed on the sample surface. Was. That is, the position of the lens that receives light from the camera is located inside the region formed by a vertical line extending in a direction perpendicular to the surface of the sample from the entire outer periphery of the region where the sample is photographed. For this reason, when photographing a sample with high gloss such as glass, the lens or the camera itself may be photographed by reflected light. In addition, B in FIG.
Reference numerals 1 and B2 denote vertical lines that stand perpendicular to the sample 110 from the end of the sample 110. When a lens or a camera is included in an image captured by the image capturing method shown in FIG. 3, the influence is removed by a calculation process in the automatic inspection, and the captured portion is fixed noise when the image is visually observed. As a result, the work was not included in the judgment of the inspection, and as a result, the influence of the lens and the image of the camera which were photographed was made so as not to be affected. However, in some cases, this is not possible, and to prevent the lens and camera from appearing in the captured image as much as possible, coating the lens surface with an anti-reflective film,
The camera itself is covered with a low-reflectance object to reduce reflections.

On the other hand, LCD (Liquid Crystal)
Al Display Devices) have been required to be increasingly finer and have higher quality, and it has become necessary to distinguish subtle shading such as unevenness.
However, when the color filter for LCD is photographed using a TV camera to determine subtle shading such as unevenness, even if the lens is coated with an antireflection film or the camera is covered, Can not be reduced to the required intensity, and the place where the lens and camera are reflected must be made an invalid area, that is, a non-inspection area, and even if there is a defect in the invalid area, it is shipped as it is as a good product Had become a problem.

[0004]

As described above, an image of an LCD color filter is taken using a television camera,
When discriminating subtle shading such as unevenness of an LCD color filter, there has been a demand for a method that can be used as an inspection (discrimination) target without being affected by an image of a lens or a camera itself. Under such circumstances, the present invention can be applied to a case in which a television camera is used to photograph an LCD color filter to determine subtle shading such as unevenness of the LCD color filter. It is an object of the present invention to provide a photographing apparatus and a photographing method that can use the entire region to be photographed as an inspection (discrimination) object without photographing the image.

[0005]

SUMMARY OF THE INVENTION An imaging apparatus according to the present invention is an imaging apparatus used for an inspection apparatus or the like for imaging a sample with a television camera, wherein a sample surface and a light receiving surface of the camera are parallel to each other, and The camera and the sample mounting table are provided so that the optical axis of the camera lens is perpendicular to the sample surface. It is characterized by being located outside a region formed by a vertical line standing in a vertical direction. And the sample in the above is LCD
(Liquid Crystal Display D
device) is characterized by being a color filter. Further, the imaging method of the present invention is an imaging method for imaging a sample with a television camera, wherein the sample surface and the light receiving surface of the camera are parallel, and the optical axis of the camera lens is perpendicular to the sample surface. In addition, the camera and the sample mounting table are set, and the lens position where the camera receives light is positioned outside the region formed by a vertical line extending in the direction perpendicular to the surface of the sample from the entire periphery of the region where the sample is captured. And place it in
It is characterized in that a sample is photographed. And
The above sample is an LCD (Liquid Crystal)
al Display Device). In the above description, the light receiving surface (also referred to as an image forming surface) of the camera is set according to the lens position and the sample position.

[0006]

With the above configuration, the photographing apparatus of the present invention can be used for photographing an LCD color filter using a television camera and determining subtle shading such as unevenness of the LCD color filter. Therefore, it is possible to provide an imaging device that can use the entire area to be imaged as it is as an inspection (discrimination) target without imaging the influence of an image of a lens or a camera itself. In detail, the camera and the sample mounting table are provided so that the sample surface and the light receiving surface of the camera are parallel and the optical axis of the camera lens is perpendicular to the sample surface. Is achieved by being located outside the region formed by a vertical line perpendicular to the surface of the sample, from the entire outer periphery of the region where the sample is photographed, Is L
This is particularly effective when a delicate distinction such as unevenness is required as in a color filter for CD.

The photographing method of the present invention is a method performed by photographing using the apparatus of the present invention.
This is particularly effective when a delicate distinction such as unevenness is required as in a color filter for CD.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the photographing apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing a schematic configuration of the present embodiment, and FIG. 2 is a cross-sectional view taken along the direction A1 of FIG. 1, showing only a positional relationship of a necessary configuration. 1 and 2, 1
00 is a photographing device, 110 is a sample (LCD color filter), 120 is a CCD television camera, 121 is an imaging surface (also called a light receiving surface), 123 is a lens, 123A is an optical axis, 140 is illumination means, and 150 is a sample. A mounting table, 160 is a camera support column, 170 is a camera driving unit, and 171 is an output cable. The photographing apparatus 100 according to the present embodiment includes an LCD
(Liquid Crystal Display D
device), which is used in an inspection device that determines subtle shading such as unevenness of a color filter for an image, and does not photograph an image of a lens or a camera itself, but directly inspects (determines) the entire region of a photographed sample. ) Can be used with the subject.

As shown in FIG. 1, with a sample (LCD color filter) 110 placed on a sample mounting table 150, the sample surface is illuminated by illumination means 140 from the back side of the sample. A predetermined area of the sample 110 is photographed by the CCD television camera 120 disposed on the front side of the camera. The sample mounting table 150 has a central area penetrating therethrough, and the sample 110 is held only at its peripheral portion. The light of the illumination means 140 is directly applied to the sample 110 and the transmitted light is photographed by the CCD television camera 120. . Lighting means 1
Reference numeral 40 denotes a light source provided with a diffusion plate on the sample surface 110 side and irradiating the sample 110 with a plurality of fluorescent lamps as light sources. CC
The D television camera 120 is driven by a camera driving unit 170, and sends an image signal to an external television monitor and an image processing device via an output cable 171 of the camera driving unit 170. Then, the sent image signal is subjected to a filtering process or the like as necessary by an image processing device, and the defect of the sample is detected.

Next, the positional relationship among the sample 110, the lens 123, and the image plane 121 will be described with reference to FIG. The CCD television camera 120 and the sample mounting table 15 are set so that the sample surface and the image forming surface 121 of the camera are parallel to each other, and the optical axis 123A of the camera lens 123 is perpendicular to the sample surface.
0, and the position of the lens 123 that receives light from the CCD television camera 120 is set to a vertical line (vertical line A1, A2, or the like) that extends perpendicularly to the surface of the sample 110 from the entire outer periphery of the region where the sample 110 is captured. Are located outside the region formed by The imaging surface (also referred to as a light receiving surface) 12 of the camera is adjusted according to the position of the lens 123 and the position of the sample 110.
1 is set. In this embodiment, the imaging plane 12 of the camera
The center of 1 is provided at a position shifted from the optical axis 123A of the lens 123.

As an embodiment of the photographing method of the present invention, an LCD
An example in which a color filter for use is photographed using the apparatus of the embodiment of the present invention will be described. The photographing method according to the present embodiment employs a positional relationship as shown in FIG.
Is photographed in a state where is placed on the sample mounting table 150. That is, the sample surface is parallel to the image forming surface 121 of the camera, the optical axis 123A of the camera lens 123 is perpendicular to the sample surface, and the CCD television camera 12
The position of the lens 123 receiving the light of 0 is a vertical line (vertical lines A1, A2, etc.) standing in a direction perpendicular to the surface of the sample 110 from the entire outer periphery of the image capturing area of the sample (LCD color filter) 110. Is photographed in a state where it is located outside the region formed by For this reason, the lens of the camera and the camera itself are the sample (color filter for LCD) 1
Due to the reflection from 10, the image is not photographed on the image plane 121 of the camera, and a high quality image obtained by photographing can be obtained. The data processing is easy to detect. The imaging method of the present invention has a high surface reflectance, and depending on its position, is an effective method for a sample in which a lens or a camera itself is imaged by reflected light from the sample. It is not particularly limited to LCD color filters.

[0012]

According to the present invention, as described above, when a sample is photographed using a television camera by inspection or the like, the entire region to be photographed is inspected (discriminated) without photographing an image of the lens or the camera itself. An imaging device and an imaging method that can be used as an object can be provided. In particular, an LCD (Liquid Crystal Displ.)
ay Device) color filter
This is effective in determining subtle shading such as unevenness of an LCD color filter.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a schematic configuration of an embodiment of a photographing apparatus of the present invention.

FIG. 2 is a diagram showing the positional relationship between a sample, a lens, and an image forming surface in an easily understandable manner.

FIG. 3 is a diagram showing a positional relationship between a lens and an image forming surface of a conventional photographing apparatus in an easily understandable manner.

[Explanation of symbols]

REFERENCE SIGNS LIST 100 imaging device 110 sample (LCD color filter) 120 CCD television camera 121 imaging surface 123 lens 123A optical axis 140 illumination means 150 sample mounting table 160 camera support column 170 camera driving unit 171 output cable 300 imaging device 310 sample (for LCD) Color filter) 320 CCD TV camera 321 Image plane 323 Lens 323A Optical axis 340 Illumination means 350 Sample stage

Claims (4)

[Claims] An imaging device used for an inspection device or the like, which captures a sample with a television camera, wherein a sample surface and a light receiving surface of the camera are parallel to each other, and an optical axis of a lens of the camera is perpendicular to the sample surface. The camera and the sample mounting table are provided so that the position of the lens receiving the camera is formed by a vertical line extending in a direction perpendicular to the surface of the sample from the entire outer periphery of the region where the sample is captured. A photographing apparatus, which is located outside a region to be photographed. 2. The method according to claim 1, wherein the sample is an LCD (Liq
uid Crystal Display Device
An imaging device, which is a color filter for e). 3. A photographing method for photographing a sample with a television camera, wherein the camera and the light receiving surface of the camera are parallel to each other, and the optical axis of the camera lens is perpendicular to the sample surface. Set the sample table, and adjust the position of the lens that receives light from the camera from the entire outer periphery of the area where the sample is captured.
An imaging method comprising: arranging a sample outside a region formed by a vertical line extending in a direction perpendicular to a surface of the sample, and imaging the sample. 4. The method according to claim 3, wherein the sample is an LCD (Liq
uid Crystal Display Device
e) a photographing method characterized by being a color filter for e).