JPH02103453A - Transparent-container checking apparatus - Google Patents

Abstract

PURPOSE:To make it possible to detect minute flaws positively by checking defects utilizing halation at the output surface of light which is propagated along the wall surface of the inner part of the wall of the main body of a transparent container. CONSTITUTION:A part of light which is projected from a light source 1 is slightly refracted. The light penetrates the wall of a glass bottle 2. The remaining light repeats reflection at the inner part of the wall and advances. When the light hits a defective part such as a flaw, irregular reflection, i.e. halation 6, occurs. The halation at the output end surface of the light looks extremely bright. Even a small crack causes linear halation 7 and looks bright so that the crack can be distinguished from the normal part. Said state is captured with a CCD camera and displayed on the screen of a CRT in an image processing part. Thus the fine flaw can be positively detected.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a transparent container inspection device, and particularly to a transparent container inspection device that can reliably detect defects such as scratches and cracks that may occur on the top surface or ridgeline of glass bottles. related to the inspection equipment.

[Prior art and its problems] Inspection devices for detecting defects in glass containers, etc. transmit or reflect light from a light source through the glass container, etc., and transmit the transmitted or reflected light to a phototube, line sensor, phototransistor, It is known that the detection is performed using a photodiode, a photomultiplier tube, a COD, or other photosensitive means, and the detection is performed by data processing and/or image processing to detect the difference in shading. Figures 4 and 5 are schematic diagrams of the main parts of such conventional inspection equipment; the fourth one uses reflected light, and the one in Figure 5 uses transmitted light. ing. By the way, the top of the glass bottle, that is, the mouth of the glass bottle, which becomes a horizontal plane when it is placed in a fixed position, and the ridgeline, that is, the outer periphery of the top, and the boundary that extends slightly downward from there and transitions to the constricted part are the parts of the bottle that are Wrinkles, unevenness, smearing, etc. are likely to occur during the molding and finishing process. However, with conventional inspection equipment such as the one described above, it is almost difficult to distinguish whether small scratches or cracks that occur on the part are molding marks during molding or defects that occurred later, and this results in the inconvenience of disposing of even non-defective products as defective. was there.

[Purpose of the invention]

In view of the above-mentioned problems, the present invention skillfully utilizes the properties of light to detect small scratches that may occur on the top or ridgeline of a bottle, which were difficult to detect in the past and had to be found manually by direct visual inspection. It is an object of the present invention to provide an inspection device that can efficiently determine the quality of the product by performing image processing on the output.

[Key points of the invention]

According to the present invention, the purpose is to set the light source so that the light from the light source propagates inside the wall of the transparent container body along the wall surface,
When light is projected from the light source, a photosensitive means is made to face an exit end face of the light emitted to the outside from the transparent container body, and defects in the transparent container are detected based on the light detection output of the photosensitive means. This is achieved by providing a transparent container inspection device that does the following.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic plan view showing the configuration of a transparent container inspection device of the present invention. This inspection device has a light source 1 such as an incandescent lamp, a halogen lamp, a mercury lamp, a strobe, or the like. The area near the narrow part of the side wall is selected and projected. For example, a phototube, a line sensor, a phototransistor, a photomultiplier tube, a COD, and other photosensitive means are arranged at a portion facing away from the mouth of the glass bottle 2, and in this figure, a CCD camera 3 is provided. An image is formed using a lens attached to the CCD camera 3. Although not shown, the light detection output of the CCD camera 3 is introduced into a control device that performs known data processing, image processing, etc.

FIG. 1(b) is a plan view showing the 111th surface of the top surface 4 of the glass bottle 2, and the portion surrounded by dotted lines is a cathode ray tube (hereinafter referred to as CRT) in the image processing section of the control device.
This is a preset inspection area 5 behind the display area projected on the screen. The glass bottle 2 is rotated in a known manner by a rotating mechanism (not shown), which is indicated by an arrow in the figure.

A part of the light projected from the light source 1 is slightly refracted and transmitted through the wall of the glass bottle 2, but the remaining part is repeatedly reflected inside the wall and travels through the glass fiber as if it were light. I'll go. When the light hits a defective part such as a scratch or a crack, diffuse reflection or halation 6 occurs, and the light emitting end face appears to shine noticeably, as if the light were concentrated on that part. In addition, even in the case of small cracks, etc., linear halation 7 appears, which is bright enough to distinguish it from a normal part. (Then, such a situation is captured by the CCD camera 3, and the situation is projected on the CRT screen of the image processing section.And, since the glass bottle 2 is rotated as described above, The halation 6 corresponding to the defective portion that was not imaged in the inspection area 5 will soon come to be imaged in the inspection area 5, so that the entire top surface group can be inspected.

FIG. 2(a) is a plan view showing the arrangement of each member when detecting defects that may occur on the ridgeline of the bottle bottom 8 of the glass bottle 2. Although two light sources 1 are provided, only one may be used.

FIG. 2(b) shows the bottle bottom 8 inspected with the configuration shown in FIG. 2(a).
This is a plan view showing what happens when there is a defect, and halation 6 is shown.

FIG. 3(a) is a plan view showing the arrangement of each member when detecting defects that may occur in the shoulder 9, body 10, etc. of the glass bottle 2. When the inside of the bottle 2 is filled with powder 11, liquid, etc., when using the conventional method, the powder 11 blocks transmitted light, etc., making it difficult to distinguish between the filling and the defects at the border that contacts it. By using light that propagates inside the bottle wall, it is possible to clearly distinguish between these types. In the same figure (b), crack-shaped halation 7 is shown.

The members shown in each figure are supported by a known interlocking mechanism. That is, the glass bottle 2 is placed on a rotationally driven mounting table,
The light source 1 and the CCD camera 3 are configured to be able to move horizontally, vertically, and swing freely, and can be moved toward and away from the glass bottle 2 to adjust the optimum state manually or automatically by a control device.

[Effects of the Invention] As explained in detail above, according to the present invention, defects are inspected using halation at the exit surface caused by light propagating inside the wall of the transparent container body along the wall surface. It is possible to obtain a useful inspection device that can reliably find minute scratches on the top surface and ridge lines that have been difficult to find.

[Brief explanation of drawings]

FIG. 1(a) is a schematic plan view showing the configuration of the transparent container inspection device of the present invention, FIG. 1U(b) is an end view showing the top surface of a glass bottle, and FIG. A plan view showing how defects are inspected; FIG. 2(b) is a plan view showing how the bottom of the bottle is inspected; FIG. 3(a) is a plan view showing how the body of the glass bottle is inspected for defects. , FIG. 3(b) is a plan view showing the state of defects that appear during inspection of the trunk, and FIGS. 4 and 5 are plan views showing conventional examples.・Light source, ・Glass bottle, ・CCD camera, ・Top section, ・Display area, ・・halation, ・Bottle bottom, ・Shoulder, ・Body, ・Powder.

Claims (1)

[Claims] When light is projected from a light source, the light from the light source propagates inside the wall of the transparent container body along the wall surface, and a photosensitive means is placed opposite to the output end surface of the light emitted from the transparent container body to the outside. A transparent container inspection device characterized in that a defect in the transparent container is detected based on a light detection output of the means.