JPS62176281A - Image input device - Google Patents

Abstract

PURPOSE:To shorten the time needed for inspection by obtaining simultaneously plural images without unevenness in the light quantity by dividing an optical signal from the irradiated object in plural directions and image-picking up it with plural photographing devices. CONSTITUTION:An inspected object A is mounted on a table 11 and an equal light is irradiated in the horizontal direction by a halogen electric lamp 12. Reflecting lights S1 and S2 from the first image-picking up area 13 and the second image-picking up area 14 are reflected in two contrary directions are reflected by a V-shaped reflecting mirror 16, and the image is picked up by ITV cameras 18A and 18B respectively. Next, the table 11 is shifted, the area 13 is shifted up to the position of the area 14 and photographed by the ITV camera. Thus, plural images of the inspected object is overlapped and inputted to the ITV cameras 18A and 18B and the unevenness in light quantity is eliminated at the image. Thus, since the image without unevenness in light quantity can be simultaneously obtained from plural image-picking up areas, the time needed for the surface inspection of an object is shortened.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an object surface inspection device that illuminates an object to be inspected and images the surface of the object to be inspected using an optical signal from the surface of the object. The present invention relates to an image input device for image input.

[Technical background of the invention and its problems]

In an object surface inspection device, for example, when the entire surface of an object to be inspected is irradiated with light and imaged to inspect the surface condition, that is, the presence or absence of dust, scratches, etc., many images may be taken if the imaging area covering multiple locations is small. need to be photographed. In this case, by using two industrial television cameras (hereinafter referred to as ITV cameras) each equipped with a camera lens, images of two imaging areas with the same shape and area can be obtained simultaneously, reducing the number of imaging times by almost half. be able to.

Therefore, as a method of inputting images, conventionally, as shown in Fig. 2, an I
There is a method of installing TV cameras (IA) and (IB) in parallel.

However, in this method, ITV camera (IA), (i
n) and the outer diameter dimensions of the camera lenses (2A) and (2B), the distance between the imaging areas (3) and (4) becomes wider as shown in Figure 2, making it difficult to If the imaging areas (3) and (4) on the surface of the object to be inspected (8) are small as shown in Figure 3, the optical signal from the imaging area (3) (S ) is I
While light enters the TV camera (IA) and an image is obtained, the optical signal (S2) from the imaging area (4) does not enter the ITV camera (IB), making it impossible to input an image. There is a problem. In addition, as shown in Fig. 4, by arranging the ITV camera (IA) and the ITV camera (IU) orthogonally and providing a half mirror (5) between them, adjacent imaging areas (3), (4) However, in this method, the optical signals (S) from the imaging areas (3) and (4) are
l) and (32) are the transmitted light to the ITV camera (1^), the reflected light (L2) to the ITV camera (IB), and the absorbed light absorbed by the half mirror (5) (not shown). There is a problem that the amount of light is reduced as it is dispersed between There is a method of inputting the optical signal (Sl), (32) to the ITV camera (IA) and the ITV camera (IB) to obtain an image. However, with this method, when the camera lenses (2A) and (2B) are smaller than the imaging areas (3) and (4), the amount of light to the ITV camera (IA) and ITV camera (IB) decreases, which is not satisfactory. If an image cannot be obtained and the camera lenses (2A) and (2B) are large, the areas adjacent to the imaging areas (3) and (4) (
7) Since the amount of light decreases, there is a drawback that unevenness in the amount of light occurs in the image.

[Purpose of the invention]

The present invention has been made based on the above circumstances.

It is an object of the present invention to provide an image input device that can simultaneously obtain images without unevenness in light amount from a plurality of imaging areas and shorten the time required for inspection.

[Summary of the Invention] In order to achieve the above object, the present invention includes an irradiation means for irradiating light onto the surface of an object, and a dividing means for dividing the optical signal from the object irradiated by the irradiation means into a plurality of directions. ,
and an imaging device that images each of the optical signals divided by the dividing means, and the interval between the two imaging regions divided and imaged by the dividing means is set to be equal to or smaller than the area or shape of the imaging region. By setting the magnification to 0.8 to 1.0 times, it is possible to prevent the decrease in the amount of light in adjacent areas, which has been a problem in the past, and to obtain an image without unevenness in the amount of light. It is something.

[Embodiments of the invention]

The present invention will be explained below based on an embodiment shown in FIG. In the figure, (11) is a table movable in the X-Y direction, and the surface of an object placed on this table (11), such as the object to be inspected (A), is means), the illuminance is irradiated almost horizontally with uniform illuminance.

The first imaging region (13) and the second imaging region (14) for imaging the inspection object (A) have the same shape and area, and the first imaging region (13) and the second imaging region (14) have the same shape and area. The interval region (15) between the imaging region (14) and the imaging region (14) is also assumed to have the same shape and area as the imaging region (13) or (14). Further, (16) is a V-shaped reflector installed above the object to be inspected (A);
2), reflected light from the first imaging area (13) and the second imaging area (14) illuminated by the optical signal (
St) and (S2) are the reflecting mirrors (16
), the light is divided and reflected in two opposite directions.

One optical signal (Sl) is transmitted to the camera lens (17
A) The image of the first imaging area (13) is obtained from the ITV camera (18A), and the other optical signal (S2)
is incident on the camera lens (17B), and the ITV camera (
18B) to obtain an image of the second imaging area (14).

Next, the operation of the present invention based on the above configuration will be explained. First, an object to be inspected (A) is placed on a table (11), and a halogen light bulb (12) is placed on the object to be inspected (A).
irradiates the surface with uniform light from a nearly horizontal direction. Then, the reflected light from the first imaging area (13) and the second imaging area (14), that is, the optical signals (Sl) and (S2), are reflected in two opposite directions by the V-shaped reflecting mirror (16). , one optical signal (Sl) is incident on the camera lens (17A) and an image is obtained by the ITV camera (18A), and the other optical signal (S2) is incident on the camera lens (17A).
17B) and an image can be obtained by an ITV camera (18B).

Next, when the table (11) is moved by a distance a in the direction of ) to the position of the interval area (
15) is located at the position of the second imaging area (14), and an imaging area (not shown) adjacent to the first imaging area (13) is located at the position of the first imaging area (13).
are positioned at the positions of the imaging areas (13), respectively, to form new imaging areas, and images without unevenness in light amount can be obtained at the same time.

If the interval region (15) between the first imaging region (13) and the second imaging region (14) is smaller than the area of each of them, the first and second imaging regions (14)
13) and (14) images are from ITV camera (18A)
and (18B), then table (11)
When the object to be inspected (A) is moved by a distance a, the interval region (15) and the first imaging region (13)
, a part of the second imaging area (14) becomes a new imaging area, and multiple images of the object to be inspected (A) are input in an overlapping state to the ITV cameras (18A) and (18B). Become.

Therefore, in the present invention, the interval region (15) between the first imaging region (13) and the second imaging region (14) is
and second imaging region (13), (14) and area,
By setting the shapes to be the same, the two imaging areas (13) and (14) are close to each other, and the camera lens (17A) of the ITv camera (18A) and (18B)
, (17B) are larger than the imaging areas (13) and (14), it is possible to prevent uneven light amount from occurring in the image.

As mentioned above, this device has two imaging areas (13).

(14) By arranging a V-shaped reflector (16) directly above the interval region (15) provided in between, the optical signal (Sl) from the imaging region (13) and the imaging region (14)
The optical signal (S2) from is not sufficiently reflected by the reflection M (IS), and the two imaging areas (13),
(14) Shape 1 of the interval area (15) provided between
By setting the area to be equal to the imaging areas (13) and (14) above, the number of times the table (11) is moved can be reduced by almost half even when obtaining multiple images of the inspected object (A), making it more efficient. In this country, the interval between the interval regions (15) is two imaging regions (13) and (14).
), the object to be inspected (A
) can be obtained only once by moving the table (11) once, thus increasing the number of times the table (11) is moved. In addition, if the interval between the interval regions (15) is slightly smaller than each of the two imaging regions (13) and (14), and is 0.8 to 1.0 times, the table (1
By moving 1), the above imaging areas (13) and (14)
The image partially overlaps with the new image captured in the interval area (15), but this is tolerable due to errors in the table (11) and other devices.

〔Effect of the invention〕

As described above, according to the present invention, since images without unevenness in light amount can be obtained simultaneously from a plurality of imaging areas, the present invention has the excellent effect of reducing the time required to scan the surface of an object.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIGS. 2 to 6 are block diagrams showing conventional examples, and FIG.
FIG. 2 is a front view of an image input device in which multiple ITV cameras are arranged in parallel above respective imaging areas. Figure 3 shows that the objects to be inspected are smaller than those in Figure 2 and include two ITVs.
Front view of the image input device showing a state in which one of the cameras cannot obtain an image, 4th I! l is a front view of an image input device that obtains images from adjacent imaging areas using a half mirror;
Figure 5 is a front view of an image input device that obtains images from adjacent imaging areas using a V-shaped reflector, and Figure 6 shows a state in which optical signals are not sufficiently obtained from adjacent areas of the imaging area in Figure 5. It is a front view of the image input device shown in FIG.
... Interval area 16 ... ■ Letter-shaped reflecting mirror (dividing means)
17A, 17B...Camera lenses 18A, 18
B・I TV camera (imaging device) S1pS2... optical signal

Claims (4)

[Claims] (1) An irradiating means for irradiating light onto the surface of an object, a dividing means for dividing into multiple directions an optical signal from the object irradiated by the irradiating means, and each optical signal divided by the dividing means. An image input device comprising a plurality of imaging devices that capture images. (2) The image input device according to claim 1, wherein each of the plurality of image pickup devices images different image pickup areas of the object. (3) Image input according to claim 2, wherein the plurality of imaging regions are all equal in shape and area, and the interval regions are also 0.8 to 1.0 times as large as the imaging regions. Device. (4) The image input device according to claim 1, wherein the dividing means is a reflecting mirror.