JPH08338713A - Illuminating device for image processor - Google Patents

Abstract

PURPOSE: To miniaturize an illuminating device for image processor whose constitution is simplified and whose manufacture cost can be reduced. CONSTITUTION: A plurality of light sources 21a, 21b are disposed on two concentric circles on a light source board 11, and lenses 22a, 22b are provided at positions corresponding to the light sources 21, 21b on a lens holding board 12 respectively. Light outgoing from the light sources 21a, 21b is refracted by each lens 22a, 22b, optical paths are bent and converged and projected toward an object to be inspected 17. The object to be inspected 17 is photographed in a photographing part 18 through window parts 13, 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illuminating device for an image processing device for illuminating an object to be inspected in an image processing device for performing visual inspection of a printed circuit board, an integrated circuit or the like by image processing.

[0002]

2. Description of the Related Art In an image processing apparatus (also referred to as an appearance inspection apparatus) for performing an appearance inspection of a printed circuit board, an integrated circuit or the like by image processing, an object to be inspected is easily detected so that the shape of the object to be inspected can be easily grasped. On the other hand, the illumination is performed from various angles to obtain an image in which a defective product and a non-defective product can be discriminated from the shape. As an illuminating device therefor, for example, as disclosed in Japanese Patent Laid-Open No. 6-300702, there is an illuminating device in which a plurality of light emitting elements are three-dimensionally arranged so that illuminating light from a required angle can be obtained.

[0003]

However, in a lighting device in which a plurality of light emitting elements are three-dimensionally arranged, the size of the lighting device becomes large, the structure becomes complicated, the manufacturing is difficult, and the manufacturing cost becomes high. was there.

The present invention has been made in view of the above problems, and an object thereof is to provide an illuminating device for an image processing apparatus, which can be miniaturized, has a simple structure, and can reduce the manufacturing cost. .

[0005]

An illumination device for an image processing apparatus according to claim 1 or 2 is arranged in the same plane.
One or more light emitting units and an optical member that irradiates the light emitted from the light emitting units toward an object to be inspected in the image processing apparatus. The optical member includes, for example, at least one of a lens and a mirror.

According to a third aspect of the present invention, there is provided a lighting device for an image processing device, which has a flat plate having a window portion for an image pickup portion of the image processing device in a central portion, and one or more light emitting portions arranged on the flat plate. And an optical member for irradiating the light emitted from the light emitting unit toward an object to be inspected in the image processing apparatus. The optical member includes, for example, at least one of a lens and a mirror.

[0007]

In the illumination device for an image processing device according to claim 1 or 2, the light emitted from one or more light emitting portions arranged in the same plane is transmitted by the image processing device by an optical member such as a lens or a mirror. Is irradiated toward the inspection object in.

In the illumination device for an image processing device according to the third or fourth aspect, the light emitted from the one or more light emitting portions arranged on the flat plate is supplied to the image processing device by an optical member such as a lens and a mirror. It is irradiated toward the object to be inspected. The image capturing unit of the image processing apparatus captures an image of the object to be inspected through a window provided in the center of the flat plate.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing the arrangement of an illumination device for an image processing apparatus according to the first embodiment of the present invention, and FIG. 2 is a bottom view of the illumination device for an image processing apparatus shown in FIG. As shown in these drawings, the illumination device 10 for an image processing device according to the present embodiment has a circular flat plate-shaped light source substrate 11, and a lower surface of the light source substrate 11 having the same diameter as the light source substrate 11. And a circular lens-shaped substrate 12 for holding a lens, which is bonded to the substrate. The light source substrate 11 and the lens holding substrate 12 include
Circular windows (holes) 13 and 14 for the image pickup unit of the image processing apparatus are provided in the center of each. Windows 13, 14
The central axis of is coincident with the optical axis 20 of the illumination device 10 for the image processing apparatus. Light source substrate 11 and lens holding substrate 1
2 is supported by a supporting device 15 and is positioned at an arbitrary position on the inspected object holding substrate 16 of the image processing apparatus. At this time, the light source substrate 11
The lens holding substrate 12 is arranged so that the optical axis 20 is perpendicular to the inspection object holding substrate 16. The inspection object 17 is mounted on the inspection object holding substrate 16. The image pickup unit 18 of the image processing apparatus is arranged on the extension line of the optical axis 20 above the light source substrate 11. The imaging unit 18 has, for example, a CC
A D (charge coupled device) camera is used.

As shown in FIG. 2, on the lower surface of the light source substrate 11, four light sources 21a are arranged at equal intervals on a concentric circle centered on the optical axis 20 at a position near the window 13. , And at positions outside these light sources 21a,
Four light sources 21b are arranged at equal intervals on a concentric circle centered on the optical axis 20. For example, light emitting diodes are used as the light sources 21a and 21b. Lens holding substrate 12
A circular hole 23 is formed at a position corresponding to each of the light sources 21a and 21b. An inner lens 22a held by a holding member 24 is provided in the hole 23 at a position corresponding to the light source 21a. An outer lens 22b held by a holding member 24 is provided in the hole 23 at a position corresponding to the light source 21b.

As shown in FIG. 3, each lens 22a, 22
In b, the optical axis is the optical axis 2 of the illumination device 10 for the image processing apparatus.
It is formed so as to form a part of an imaginary lens 25 designed to converge the light emitted from the light sources 21a and 21b, which coincides with 0, in the same area on the inspection object holding substrate 16. . Therefore, as shown in FIG. 1, each light source 21a,
The light emitted from 21b is refracted by the lenses 22a and 22b, the optical path is bent and converged, and the light is emitted toward the inspection object 17 on the inspection object holding substrate 16. The conditions such as the focal length of the imaginary lens 25 are defined by the angles 26 and 27 formed by the light emitted from the lenses 22a and 22b and the substrate 16 for holding the inspection object, and the lenses 22a and 22b.
It is determined according to the distance between b and the object holding substrate 16.

Next, the operation of the illumination device 10 for the image processing apparatus according to this embodiment will be described. When the appearance inspection of the inspection object 17 is performed by using the image processing apparatus, the inspection object 17 is mounted on the inspection object holding substrate 16 as shown in FIG. The optical axis 20 of the processing device illumination device 10 is aligned with the inspection object 17. Further, the imaging unit 18 of the image processing apparatus is arranged on the extension line of the optical axis 20 above the light source substrate 11 by a supporting device (not shown). When the light sources 21a and 21b are turned on in this state, the light emitted from the light sources 21a and 21b is refracted by the lenses 22a and 22b, the optical path is bent and converged, and the light is irradiated toward the inspection object 17. To be done. The object 17 to be inspected illuminated in this manner has the windows 13, 1
The image is captured by the image capturing unit 18 through
The appearance inspection is performed on the inspection object 17 by processing the image captured by the processing device 8 by the processing device. In addition, it is possible to freely select to turn on all the light sources 21a and 21b at the same time, turn on one by one, or turn on in any combination according to the intended use.

As described above, according to the illumination device 10 for the image processing apparatus of this embodiment, the light sources 21a and 21b are arranged on the same plane of the light source substrate 11, and the light sources 21a and 21b are arranged in the same plane.
Since the light emitted from 21b is applied to the object 17 to be inspected by the lenses 22a and 22b provided on the lens holding substrate 12, the size can be reduced as compared with the conventional illumination device for the image processing device, and The structure is simple, the manufacturing is easy, and the manufacturing cost can be reduced. Further, since the structure is simple and the manufacturing is easy, the accuracy of the lighting device 10 can be improved. Further, since the window portions 13 and 14 are provided on the light source substrate 11 and the lens holding substrate 12, and the plurality of light sources 21a and 21b are arranged around them, the window portions 13 and 14 do not interfere with the image pickup portion 18 of the image processing apparatus and are covered. Inspection item 17
It is possible to evenly irradiate the light.

FIG. 4 is a sectional view showing the arrangement of an illumination device for an image processing apparatus according to the second embodiment of the present invention. In the image processing device lighting device 30 according to the present embodiment, an optical member holding substrate 32 is provided instead of the lens holding substrate 12 in the image processing device lighting device 10 according to the first embodiment. In the optical member holding substrate 32, in the central portion,
A circular window portion 14 for an image pickup portion of the image processing device is provided,
A circular hole 23 is formed at a position corresponding to the inner light source 21a, but the hole 23 is not provided at a position corresponding to the outer light source 21b. Instead, a reflector mounting portion 33 having a slope is formed. Are formed. The reflection plate mounting portion 33 is provided with a reflection plate 34 that reflects the light emitted from the light source 21b and irradiates it to the inspection object 17 on the inspection object holding substrate 16. The reflector 34 may be a plane mirror or a concave mirror. In addition, in the hole 23, the holding member 2
An inner lens 22a held by 4 is provided. Other configurations, operations, and effects of the image processing device illumination device 30 according to the present exemplary embodiment are similar to those of the image processing device illumination device 10 according to the first exemplary embodiment.

FIG. 5 is a sectional view showing the arrangement of an illumination device for an image processing apparatus according to the third embodiment of the present invention. In the illumination device 40 for an image processing apparatus according to the present embodiment, a Fresnel lens 44 is provided instead of the lens holding substrate 12 in the illumination device 10 for an image processing apparatus according to the first embodiment. The Fresnel lens 44 is provided on the lower surface of the light source substrate 11 around the window portion 13 and on the outer peripheral portion, respectively, via ring-shaped spacers 42, and the Fresnel lens 44 is provided.
It is attached to the underside of. The Fresnel lens 44 is formed in a disc shape, and has a circular window portion 45 for the image pickup unit of the image processing apparatus in the central portion.

FIG. 6 is an enlarged sectional view showing a part of the Fresnel lens 44. As shown in this figure, the Fresnel lens 44 includes a plurality of annular lens portions 44a having different radii,
44b, 44c, ... are formed continuously,
Each of the ring-shaped lens portions 44a, 44b, 44c, ... Is designed to irradiate the inspection object 17 on the inspection object holding substrate 16 with the light emitted from the light sources 21a, 21b.

Illumination device 4 for image processing apparatus according to the present embodiment
According to 0, as compared with the first or second embodiment, the size can be further reduced, the configuration is simple and the manufacturing is easy, and the accuracy can be improved. The other configurations, actions, and effects of the illumination device 40 for the image processing device according to the present embodiment are the first.
This is the same as the illumination device 10 for the image processing device according to the embodiment.

The present invention is not limited to the above-described embodiments. For example, in each embodiment, four light sources 21a and 21b are provided on two concentric circles for the light source substrate 11, but The mounting position and the number of light sources on the substrate 11 are arbitrary. For example, one or more light sources may be arranged on one concentric circle, or one or more light sources may be arranged on three or more concentric circles.

[0020]

As described above, according to the illuminating device for an image processing device of the first or second aspect, the illuminating device for the image processing device is arranged in the same plane.
Since one or more light emitting units are arranged and the light emitted from the light emitting units is directed toward the object to be inspected in the image processing apparatus by the optical member such as the lens and the mirror, the illumination device for the image processing apparatus is provided. There is an effect that the size can be reduced, the structure can be simplified, and the manufacturing cost can be reduced.

According to the lighting device for an image processing apparatus of the third or fourth aspect, one or more light emitting sections are arranged on a flat plate having a window portion for the image pickup section of the image processing apparatus in the central portion, and the light emitting section is provided. Since the light emitted from the section is irradiated toward the object to be inspected in the image processing apparatus by an optical member such as a lens and a mirror, in addition to the above effects, it does not hinder the imaging section of the image processing apparatus, and There is an effect that it is possible to uniformly irradiate the inspection object with light.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of an illumination device for an image processing device according to a first embodiment of the present invention.

FIG. 2 is a bottom view of the illumination device for the image processing device shown in FIG.

FIG. 3 is an explanatory diagram for explaining the characteristics of the lens in FIG.

FIG. 4 is a cross-sectional view showing a configuration of an illumination device for an image processing device according to a second embodiment of the present invention.

FIG. 5 is a sectional view showing a configuration of an illumination device for an image processing device according to a third embodiment of the present invention.

FIG. 6 is an enlarged sectional view showing a part of the Fresnel lens in FIG.

[Explanation of symbols]

 10 Lighting Device for Image Processing Device 11 Substrate for Light Source 12 Substrate for Lens Holding 13, 14 Window 20 Optical Axis 21a, 21b Light Source 22a, 22b Lens 17 Inspected Object 18 Imaging Section

Claims (4)

[Claims] 1. A light emitting device, comprising: one or more light emitting parts arranged in the same plane; and an optical member for irradiating light emitted from the light emitting parts toward an object to be inspected in the image processing apparatus. Lighting device for image processing device. 2. The illumination device for an image processing apparatus according to claim 1, wherein the optical member includes at least one of a lens and a mirror. 3. A flat plate having a window portion for an image pickup unit of the image processing apparatus in a central portion thereof, one or more light emitting units arranged on the flat plate, and light emitted from the light emitting unit. And an optical member for irradiating the object to be inspected, the illumination device for an image processing apparatus. 4. The illumination device for an image processing apparatus according to claim 3, wherein the optical member includes at least one of a lens and a mirror.