JPH0634567A - Work chip detector - Google Patents

Abstract

PURPOSE:To obtain a work chip detector which enables the detection of work chips in any shape. CONSTITUTION:A work chip detector is provided with image pickup means 4 and 13 which are arranged above work W to take an image of the work W, side lighting means 3 and 19 to light the work W from the side thereof. The side lighting means 19 is preferably provided with a lighting body 16 to irradiate illumination light toward the work W from above the work W and a reflector section 12 which is arranged outside the side of the work W to reflect the illumination light of the lighting body 16 to the side of the work W.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work defect detecting device used for detecting a defect of a ceramic work, for example.

[0002]

2. Description of the Related Art A conventional work defect detecting device of this type includes a VTR camera, an illuminating lamp, and an image calculation processing section, and illuminates a work arranged at a predetermined position with the illuminating lamp. An image of the work viewed from above is picked up by a VTR camera, and image data relating to the picked-up image is processed by an image calculation processing unit, for example, a change in the work outline is calculated when a defect occurs, so that there is no loss. In some cases, the work outline is compared with the work outline when there is a defect to detect the defect of the work.

[0003]

By the way, in the work defect detecting apparatus as described above, since the defect of the work is detected from the change of the outline, the defect may be detected depending on the state of the defect. There was a problem that some things could not be done.

This problem will be described in detail with reference to FIGS. 4 and 5. For example, in the case of a defect 30 that penetrates the front and back surfaces of a flat work W as shown in FIG. When the image is taken from above the work W with the VTR camera,
Since the defect 30 is imaged as a change in the outline of the work W, it is easy to detect the defect 30.

However, not only the defect 30 shown in FIG. 4 but also the surface defect 31 generated only at one end of the front and back surfaces thereof as shown in FIG. There is a case.

In such a surface defect 31, V
When the work W is imaged from above by the TR camera, the surface defect 31 cannot be recognized as an image, and as a result, the work W having such a surface defect 31 is imaged by the VTR camera, the surface defect 31. Is not displayed in the image data as a change in outline, and as a result, the work W in FIG. 5 is processed as a work W having no defect.

The present invention has been made in view of the above problems, and an object thereof is to provide a work defect detecting device capable of detecting a defect of any shape.

[0008]

In order to achieve the above-mentioned object, the present invention provides an image pickup means which is arranged above a work and picks up an image of the work, and a side illumination which illuminates the work from its side. And a work defect detecting device having means. The side illumination means includes an illuminating body that emits illumination light from above the work toward the work, and a reflection that is disposed outside the side surface of the work and reflects the illumination light of the illuminating body toward the side surface of the work. And a mirror portion.

[0009]

According to the structure of the first aspect, since the work is illuminated from the side, the defect generated on the side surface of the work can be clearly illuminated.

Further, according to the structure of the second aspect, since the side illumination of the work can be performed from above the work, it is possible to perform the side illumination for the works arranged in parallel on the plane.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. 1 is a perspective view of a work defect detecting device according to a first embodiment of the present invention. The work defect detecting device 1 includes a side illumination unit 3 arranged on the work mounting surface 2, a VTR camera 4 arranged above the work mounting surface 2, and an upper portion for illuminating the work mounting surface 2 from above. The lighting unit 5 and the image calculation processing unit 6 are provided.

The side illumination unit 3 comprises four illumination boxes 3a, and illumination light is supplied to these illumination boxes 3a from an illumination source (not shown) by a fiber cable 7. These illumination boxes 3a surround the center of the work mounting surface 2 and are arranged on four sides thereof, and an illumination light emission slit 8 is formed on the side surface of each illumination box 3a on the center side. The upper illumination section 5 is composed of a ring type illumination body (for example, a ring fluorescent lamp), and is arranged above the work placement surface 2 so as to surround the VTR camera 4. The image processing unit 6 is the VTR camera 4
The image data of the work W captured by is image-processed and the defect is detected.

Work W by this work defect detecting device 1
The defect detection work (for example, a ceramic work) is performed as follows. That is, the work W is placed on the work placement surface 2. Illumination light is emitted from the illumination light emission slits 8 of the respective illumination boxes 3a to the respective side surfaces of the placed work W. Further, the upper irradiation part 5 irradiates the upper surface of the work W with illumination light. The image of the work W illuminated by each of the illumination units 3 and 5 is captured by the VTR camera 4, and the image data thereof is input to the image calculation processing unit 6.

With respect to the image data input to the image calculation processing section 6, the image outline (outline) and the in-image brightness difference are calculated, and the presence or absence of a defect is detected by the calculation result. That is, when the work W has the penetrating defect 30 as shown in FIG. 4, the outline obtained from the image obtained by the upper VTR camera 4 is discontinuous.
The discontinuous shape is detected by the image calculation processing unit 6 to recognize the presence or absence of the penetrating defect 30. When the work W has a surface defect 31 as shown in FIG. 5, a difference in lightness occurs between the surface defect 31 and its surroundings in the obtained image data. This is because there is a difference in the angle at which the illumination light of the lateral illumination section 3 is reflected toward the VTR camera 4 between the side surface of the work W in which the surface defect 31 has occurred and the normal side surface around it. This is because the difference in angle appears as a difference in brightness. Then, the image calculation processing unit 6 detects such a difference in brightness to recognize the presence or absence of the surface defect 31.

In the first embodiment, a defect is detected for each individual work W, but in the second embodiment described below, a plurality of works W are detected.
The presence or absence of the defect is continuously detected. That is, the work defect detecting device 10 is provided with the work placing plate 11
Is equipped with. The work mounting plate 11 has a size capable of mounting a plurality of works W, and is divided by the reflecting mirror portion 12 into mounting areas A of the respective works W in a grid pattern.
The reflecting mirror portion 12 is made of a triangular prism whose outer surface is mirror-finished,
It is arranged so as to surround four sides of each work placement area A. The work placing plate 11 is conveyed in the direction a in the figure by a moving mechanism (not shown).

A VTR camera 13 is arranged above the work mounting surface 11. The VTR camera 13 is integrally attached to the XY mobile robot 14, and is arranged so as to be movable along the plane direction of the work placement plate 11. V
The TR camera 13 is integrally attached with an upper illuminating section 15 which is a ring-type illuminating body. The upper illumination unit 15 is arranged so as to surround the lens unit of the VTR camera 13.
A side illumination body 16 is integrally attached to the VTR camera 13. The side illumination body 16 is the VTR camera 13
And the work placement surface 11. The side illuminator 16 is composed of a total of four illuminator boxes 16a.
The cameras 13 are arranged on all four sides with respect to the lens center line direction. The area surrounded by these illumination boxes 16a has the same size as each work placement area A, and each illumination box 16a is located above the reflecting mirror section 12. Illumination light is supplied from an illumination source (not shown) to each illumination box 16a by a fiber cable 17.
An illumination light emission slit 18 is formed on the bottom surface of each illumination box 16a. The side illumination unit 19 is configured by the side illumination body 16 and the reflecting mirror unit 12. An image calculation processing unit 20 that processes the image data captured by the VTR camera 13 is provided.

In the work defect detecting device 10 thus constructed, the side illumination body 16 is separated from the work placing plate 11 and arranged above the work placing plate 11 as described above, and further, the side illumination unit 19 is provided. Is combined with the work placing plate 11 and the XY mobile robot 14 capable of accommodating a plurality of works W.
Therefore, a plurality of works W can be continuously subjected to the defect detection processing. That is, the work W is stored in each work placement area A of the work placement plate 11. Then, the work mounting plate 11 accommodating the work W is transported to a position below the VTR camera 13 by a transport mechanism (not shown). When the transportation is completed, the XY mobile robot 14
While the VTR camera 13, the upper illuminating unit 15, and the side illuminating body 16 are moved along the work placing plate 11, the defects of the respective works W are continuously detected. At this time, as shown in FIG. 3, the illumination light emitted downward from the illumination box 16a is reflected by the reflecting mirror portion 12 toward the side surface of the work W, and thus the same as the side illumination portion 3 of the first embodiment. , The side surface of the work W is illuminated. An image of the work W illuminated in this way is picked up by the VTR camera 13, and the image data thereof is subjected to image processing by the image calculation processing section 20 to detect whether or not each work W is missing. This image calculation process is the same as that of the first embodiment, and therefore its explanation is omitted.

When the loss detection is completed, the transport mechanism (not shown) is driven again to transport the work placement plate 11 to the next step construction position, and the work placement plate 11 containing the new loss detection work W is placed on the work placement plate 11. It is carried in under the defect detection device 10, and the above-described defect detection work is performed again.

[0019]

As described above, according to the structure of claim 1 of the present invention, since the work is illuminated from the side, the defect caused on the side surface of the work is clearly illuminated.
Not only the penetrating defect of the workpiece but also the surface defect formed on the surface portion of the side surface of the workpiece can be reliably detected, and the accuracy of detecting the workpiece W defect is improved.

Further, according to the second aspect of the invention, since the side illumination of the work can be performed from above the work W, the side illumination can be performed even for the plurality of works arranged in parallel on the plane. It was Therefore, combined with the structure of claim 1, it has become possible to detect defects of a plurality of works accurately and quickly.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a work defect detecting device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration of a work defect detecting device according to a second embodiment.

FIG. 3 is an explanatory diagram showing a state of work side illumination by a side illumination unit of the second embodiment.

FIG. 4 is a perspective view showing a shape of a penetrating defect of a work.

FIG. 5 is a perspective view showing a shape of a surface defect of a work.

[Explanation of symbols]

 3,19 Side illumination 4,13 VTR camera 30,31 Defect W work

Claims (2)

[Claims] 1. An image pickup means (4, 13) arranged above a work (W) for picking up an image of the work (W), and a side illumination means (for illuminating the work (W) from its side. 3,1
9) A work defect detecting device comprising: 2. The side illuminating means (19) is arranged outside a side surface of the work (W) and an illuminating body (16) for irradiating the work (W) with illumination light from above. The work defect detecting device according to claim 1, further comprising: a reflecting mirror section (12) that reflects the illumination light of the illumination body (16) toward a side surface of the work (W).