JPH05209837A - Transmitting apparatus of illuminating light in image processing system - Google Patents

Abstract

PURPOSE:To obtain a transmitting apparatus for transmitting the illuminating light in an image processing apparatus which enables uniform illumination in the simple structure. CONSTITUTION:A transmitting apparatus 20 of the illuminating light is formed into a rectangular parallelopiped having an incidence surface 22A, a side surface 22B facing the incidence surface 22A, side surfaces 22C, 22D and planes 22E, 22F. The incidence surface 22A has an incidence port 24 through which the illuminating light enters. An aluminum tape 26 is attached to the side surface 22B facing the incidence surface 22A, the incidence surface 22A and the side surfaces 22C, 22D to reflect the light entering from the incidence port 24. Accordingly, it becomes possible to confine the incident light. The confined light is projected from a hole 28, and therefore the periphery of the hole 28 can be illuminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illumination light transmission device in an image processing system, and more particularly to simplification and uniform illumination light.

[0002]

2. Description of the Related Art Recently, in an inspection system or the like, an inspection target is often photographed by a camera and the image is processed to perform the inspection. In this case, if the inspection target is a microscopic object such as an electronic component, the obtained image is enlarged and the inspection is performed. In general, illumination of a subject is an important factor for photographing with a camera, but particularly in the case of an electronic component that needs to inspect a minute portion, the illumination particularly affects the image.

There are various conventional illumination methods as shown in FIG. FIG. 6A shows a spot illumination method in which a subject is illuminated by one or more incandescent lamps or other luminaires. FIG. 6B is a ring illumination method in which a ring-shaped illuminating device such as a fluorescent lamp is provided to uniformly illuminate a subject. FIG. 6C is a coaxial epi-illumination method using illumination by an incandescent lamp or the tip of an optical fiber.

As described above, conventionally, illumination is performed in the image processing apparatus.

[0005]

However, the illumination of the conventional image processing apparatus has the following problems.

As described above, in the ring illumination method, uniform illumination with the same light source is possible, and it is optimal as illumination in the image processing apparatus, but since it needs to be mounted around the camera, it has space limitations. In some cases, it was difficult to use, and there was a cost problem.

In the spot illumination method and the coaxial epi-illumination method, when an object is illuminated, the surface is glossy due to variations in the reflection angle due to differences in direction and distance, and the object is not illuminated uniformly. There is also a problem that a good image cannot be obtained because of a shadow on the surface.

It is an object of the present invention to solve the above problems and provide an illumination light transmission device in an image processing device capable of simple and uniform illumination.

[0009]

According to a first aspect of the present invention, there is provided an illumination light transmission device in an image processing apparatus, wherein an illumination surface has an entrance through which illumination light is incident, and an incident surface is reflected to reflect light incident from the entrance. It is characterized in that a reflecting portion provided on a surface facing the surface and a refractive index converting portion for emitting incident light are provided.

An illumination light transmitting device in an image processing apparatus according to a second aspect is the illumination light transmitting device in an image processing system according to the first aspect, in which the refractive index converter is a hole or a hole penetrating a surface adjacent to the incident surface. It is characterized by being a filling material or a concave portion provided on the adjacent surface.

According to a third aspect of the present invention, there is provided a printed circuit board inspecting device, wherein the illumination light transmitting device according to the second aspect is used as a printed circuit board inspecting jig plate.

[0012]

In the illumination light transmitting device in the image processing apparatus according to the first aspect, the incident surface has the entrance for allowing the illumination light to enter. The reflecting portion is provided on the surface facing the incident surface in order to reflect the light incident from the entrance. The refractive index converter emits the incident light. Therefore, it is possible to illuminate the periphery of the refractive index converter.

In the illumination light transmitting device in the image processing apparatus according to the second aspect, the refractive index converting portion is further a hole or a hole filling penetrating a surface adjacent to the incident surface, or provided on the adjacent surface. It is a recess. Therefore, the refractive index converter can be provided at any position.

A printed circuit board inspection apparatus according to a third aspect uses the illumination light transmission device according to the second aspect as a printed circuit board inspection jig plate. Therefore, the jig board for inspecting the printed circuit board and the illumination light transmitting device can be shared.

[0015]

1 shows the structure of an illumination light transmission device 20 in an image processing apparatus according to an embodiment of the present invention. The illumination light transmission device 20 includes an incident surface 22A, a side surface 22B facing the incident surface 22A, side surfaces 22C and 22D, and surfaces 22E and 2.
It is formed as a rectangular parallelepiped having 2F.

The entrance surface 22A has an entrance 24 through which the illumination light enters. Aluminum tape 26 that is the reflection part
In order to reflect the light incident from the entrance 24, the side surface 22B facing the entrance surface 22A and the entrance surface 22A,
It is attached to the side surfaces 22C and 22D. The aluminum tape 26 may be any other one as long as it has a good light reflectance.

The hole 28, which is the refractive index converting portion, is formed, for example, on the surface 2
It is a through hole with 2E and 22F, and emits incident light. In addition, this device includes a light source 30 that emits illumination light,
A camera 32 is arranged above the hole 28, and a subject 34 is arranged below the hole 28. Hereinafter, this illumination light transmission device 20
The operation of will be described.

First, as shown in FIG. 2, the light from the light source 30 enters through the entrance 24 of the entrance surface 22A of the illumination light transmission device 20. The incident light rays are incident surface (side surface) 22A, side surfaces 22B, 22C, 22D to which aluminum tape 26 is attached.
Will be reflected at. For example, the incident ray R _A first strikes the side surface 22C and is reflected (R _A1 ). Then, it is reflected by the side surface 22B (R _A2 ), and the incident surface 22
A (R _A3 ), side surface 22D (R _A4 ), side surface 22B
(R _A5 ), ..., And it will be reflected many times in the illumination light transmission device 20. Similarly, the incident light rays R _B , R _C, etc. are repeatedly reflected in the illumination light transmission device 20.

As described above, the innumerable lights entering the illumination light transmission device 20 are confined in the illumination light transmission device 20. That is, uniform light exists everywhere in the illumination light transmission device 20. In this state,
When the hole 28 is provided, the trapped light beam is refracted by the hole 28 and leaks from the hole 28. Since this light beam is uniform light that is confined in the illumination light transmission device 20, it leaks out uniformly from the entire circumference of the hole 28. Therefore, in the hole 28, uniform illumination similar to the illumination in the ring illumination is obtained.

Under the illumination thus obtained, as shown in FIG. 1, the subject 34 can be photographed by the camera 32 above the hole 28 to obtain a shadowless image. Thus, the illumination light transmitting device 20 can provide simple and uniform illumination.

Further, since the hole 28 can be provided at an arbitrary place in the illumination light transmission device 20, it is possible to make a hole at an arbitrary place and photograph with the camera 32.

FIG. 3 shows the configuration of an illumination light transmission device 20 in an image processing device according to another embodiment. In this example,
Utilizing that the plate 60 on which the subject 34 is placed is transparent,
The illumination light transmission device 20 is installed on the lower surface of the plate 60. By illuminating the lower surface of the subject 34, the subject 34
The image of can be obtained. In this way, even with transmitted illumination, it is possible to capture an image under simple and uniform illumination.

FIG. 4 shows the configuration of an illumination light transmission device in a printed circuit board inspection device according to an embodiment of the present invention.
In this embodiment, the illumination light transmission device is used as the inspection jig plate of the printed circuit board inspection device. By the way, in the inspection of the printed circuit board 5, the terminal 48 of the printed circuit board 50 is brought into contact with the inspection contact terminal (probe) 40,
Check the continuity of the 0 circuit. In this case, with reference to the position mark 46 printed on the printed circuit board 50,
The plug 40 is brought into contact with the terminal 48.

In this inspection apparatus, the illumination light transmission device is used for the probe jig 42 which is an inspection jig. The probe jig 42 is made of an acrylic plate or the like and has a hole 28. Further, a camera 32 is provided above the light source 30 and the hole 28, and a positioning mark 46 printed on the printed circuit board 50 is provided below the hole 28. Also,
The camera 32 has a sufficient distance (for example, 20 mm) from the probe jig 42 so that the illumination light does not directly enter the camera lens.
The probe jig 42 and the printed circuit board 50 are provided sufficiently close (for example, 0 to 2 mm) so that the obtained illumination light does not diffuse.

When light is made incident on the probe jig 42 by the light source 30, similarly, the side surfaces 22A of the probe jig 42,
Light is confined by the aluminum tape 26 attached to 22B, 22C, and 22D. Then, the light leaking from the hole 28 can provide uniform illumination around the hole 28. Under this illumination, the positioning mark 46 is looked through the hole 28 of the probe jig 42 with the camera 32, the obtained image is viewed, and the position is finely adjusted to be brought into contact. As described above, in the printed circuit board inspection device, the illumination light transmission device and the inspection jig plate are shared, so that it is possible to obtain uniform illumination in a space-saving manner.

In the above example, all side surfaces 22
Although the aluminum tape 26 is attached to A, 22B, 22C and 22D, the aluminum tape 26 on the side surfaces 22A, 22C and 22D may be omitted. Even with such a configuration, it is possible to obtain sufficient light for illumination. Because the incident surface 2
Light incident from 2A is mostly reflected by the side surface 22B, and light reflected by the side surfaces 22B and 22C may be totally reflected even if the aluminum tape is not attached. is there.

Further, in the above example, the refractive index converting portion is constituted by the hole 28, but any material may be used as long as it can change the refractive index of the confined light. Filling may be placed in 28, or indentations 60 may be used, as shown in FIG.

In the above example, a tape made of aluminum or the like is attached to the reflecting portion so as to have a high reflectance, but a paint having a high reflectance may be applied.

Further, in the above-mentioned example, the illumination light transmission device has a rectangular parallelepiped structure, but any device may be used as long as it can confine light, for example, a cylindrical shape.

[0030]

According to the illumination light transmitting device in the image processing apparatus of the first aspect, the incident surface has the incident port for the illumination light to enter. The reflecting portion is provided on the surface facing the incident surface in order to reflect the light incident from the entrance. The refractive index converter emits the incident light. Therefore, it is possible to illuminate the periphery of the refractive index converter. Thereby, simple and uniform illumination can be obtained.

In the illumination light transmitting device in the image processing device of claim 2, the refractive index converting portion is further a hole or a hole filling penetrating a surface adjacent to the incident surface, or provided on the adjacent surface. It is a recess. Therefore, the refractive index converter can be provided at any position. Thereby, simple and uniform illumination can be obtained.

A printed circuit board inspecting apparatus according to a third aspect uses the illumination light transmitting device according to the second aspect as a jig board for inspecting a printed circuit board. Therefore, the jig board for inspecting the printed circuit board and the illumination light transmitting device can be shared. As a result, it is possible to obtain uniform illumination with a small space.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an illumination light transmission device in an image processing device according to an embodiment of the present invention.

FIG. 2 is a diagram showing an operation of the illumination light transmission device in the image processing device according to the embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of an illumination light transmission device in an image processing device according to an embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of an illumination light transmission device in a printed circuit board inspection device according to an embodiment of the present invention.

FIG. 5 is a diagram showing a shape of a refractive index conversion section.

FIG. 6 is a diagram showing a configuration of an illumination device in a conventional image processing device.

[Explanation of symbols]

 22 ... Incident surface 24 ... Incident aperture 26 ... Aluminum tape 28 ... Hole

Claims (3)

[Claims] 1. An incident surface having an entrance for allowing illumination light to enter, a reflecting portion provided on a surface facing the entrance surface for reflecting light incident from the entrance, and emitting the incident light. An illumination light transmission device in an image processing system, comprising: 2. The illumination light transmitting device in the image processing system according to claim 1, wherein the refractive index converting portion is a hole or a filling of a hole penetrating a surface adjacent to the incident surface, or provided on the adjacent surface. An illumination light transmission device in an image processing system, which is a concave portion. 3. A printed circuit board inspection device, wherein the illumination light transmission device according to claim 2 is used for a jig plate for printed circuit board inspection.