JPH10157798A - Inspecting apparatus for bottle neck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably determine a defect in a neck especially having a thread to be detected by photographing a neck of a bottle including a screw from the inside of the bottle using diffuse transmission light so that the thread may be reflected dimly dark and the defect may be reflected clearly dark. SOLUTION: A diffusing means 2 comprising a light diffusing plate with a cylindrical cross section is inserted in a neck 1a of a bottle 1, the tip 3a of an optic fiber 3 is inserted in the diffusing means 2, and the rear end of the optic fiber 3 is connected to a light source 4 to constitute a light projection means 5. A CCD camera 6 connected to an image processor 7 is placed outside the neck 1a of the bottle 1. Light projected from the tip 3a of the optic fiber 3 is incident into the neck 1a of the bottle 1 as diffused light, and a thread is may be obtained as a dimly dark image. On the other hand, a crack on the neck 1a of the bottle 1 may be obtained as a clearly dark image, so that it can be determined as a defect.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for optically inspecting a bottle neck for defects, and more particularly to an apparatus suitable for inspecting a threaded neck.

[0002]

2. Description of the Related Art As a method of detecting small cracks among defects at the neck of a glass bottle, focused light is applied to the neck from the outside of the bottle, reflected light is photographed, and a point which appears brighter than the background is determined as a defect. It is common.

[0003]

However, in the conventional method, if there is a screw in the neck, light is irregularly reflected, and it is difficult to identify a defect. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a bottle neck inspection device capable of detecting only a defect without detecting a screw.

[0004]

In order to achieve the above-mentioned object, a first aspect of the present invention is a diffusing means which is inserted into the neck of a bottle and has a cylindrical cross section and comprises a light diffusing plate; Light emitting means for projecting light into the inside, photographing means for photographing the neck,
And determining means for determining a point which appears darker than the background as a defect.

[0005] According to a first aspect of the present invention, the neck of the bottle is imaged by diffuse transmitted light from inside the bottle. When diffused light enters the inside of the bottle, light is incident on the slope of the screw thread from multiple directions, so some light will be incident on the imaging means,
The threads appear vaguely dark. Also cracks (defects)
Is a sharp V-shape, all light from the inside of the bottle is reflected vertically and horizontally at the boundary of the crack and does not enter the photographing means, so that the crack is clearly darkened. Therefore, a point darker than the background is determined as a defect.

According to a second aspect of the present invention, there is provided a reflecting means which is inserted into a neck portion of a bottle and has a circular cross section and a diffuse reflection surface on a side surface, a light projecting means for projecting light from outside the bottle to the reflecting means, It is characterized in that it comprises a photographing means for photographing the neck from the side of the means, and a judging means for judging a point which appears darker than the background as a defect.

According to the second aspect of the present invention, since the light is projected from the outside of the bottle to the diffuse reflection surface inside the bottle and photographed from the light emitting side, the neck of the bottle is bottled similarly to the first aspect. The image is taken by the diffuse transmission light from the inside. Therefore,
As in the first embodiment, a defect at the neck of the bottle can be detected.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a bottle neck inspection apparatus according to the present invention will be described below with reference to FIGS. FIG. 1 is a schematic view showing the overall configuration of the bottle neck inspection apparatus of the present invention, and FIG. 2 is a view taken along the line II-II in FIG. In FIGS. 1 and 2, reference numeral 1 denotes a glass bottle, and a thread 1 s is formed in a neck 1 a of the glass bottle 1. The bottle 1 is supported by a support 10. The support table 10 is configured to be rotatable, and the bottle 1 on the support table 10 rotates.

In the neck 1a of the bottle 1, a diffusion means 2 composed of a light diffusion plate having a cylindrical cross section is inserted. The distal end portion 3a of the optical fiber 3 is inserted inside the diffusion means 2. Then, the diffusing means 2 and the tip 3 of the optical fiber 3
a is configured to be integrally movable up and down so that the bottle 1 can be inserted into the neck 1a from outside. The rear end of the optical fiber 3 is connected to a light source 4, and the optical fiber 3 and the light source 4 constitute light projecting means 5.

[0010] Further, the neck 1a of the bottle 1 is photographed from outside C
A CD camera 6 is provided. The CCD camera 6 is connected to an image processing device 7 constituting a determination unit. Next, the operation of the bottle neck inspection apparatus configured as described above will be described with reference to FIGS. FIG. 3A shows a state of diffuse transmission light transmitted through the neck 1a of the bottle 1, and FIG.
4B shows the state of light incident on the thread 1s of the neck 1a of the bottle 1, and FIG. 4 shows an image in the inspection window among the images obtained by the image processing device 7.

The light projected from the tip 3a of the optical fiber 3 is transmitted through a diffusion means 2 comprising a light diffusion plate as shown in FIG. Incident inside. When the diffused light enters the inside of the bottle, as shown in FIG. 3B, light enters from multiple directions on the slope of the thread 1s, so that a part of the light enters the camera 6, and the image processing device In the image obtained in step 7, as shown in FIG. 4, the thread 1s becomes a faint dark image 8, and the difference in brightness from the vicinity is small.

On the other hand, a crack 1d at the neck 1a of the bottle 1
Has a sharp V-shape as shown in FIG. 3 (a), so that all light from the inside of the bottle is reflected in the vertical or horizontal direction at the boundary surface of the crack 1d and does not enter the CCD camera 6. Therefore, the crack 1d becomes a clear dark image 9 as shown in FIG. Therefore, the image processing device 7 determines a point darker than the background as a defect. The bottle 1 is rotated by the rotation of the support table 10, and the entire circumference of the neck 1 a of the bottle 1 can be inspected.

Next, another embodiment of the bottle neck inspection apparatus according to the present invention will be described with reference to FIGS. FIG. 5 is a schematic view showing the overall configuration of the bottle neck inspection apparatus of the present invention, and FIG. 6 is a view taken along the line VI-VI of FIG. 5 and 6
In the figure, reference numeral 1 denotes a glass bottle, and the glass bottle 1 has a screw 1s in a neck 1a. The bottle 1 is rotatably supported by a support base 10.

In the neck 1a of the bottle 1, a reflecting means 12 made of a milky stick having a circular cross section and a diffuse reflecting surface 12a on the side surface is provided.
Is inserted. The reflection means 12 is configured to be vertically movable so that it can be inserted into the neck 1a from outside the bottle 1. A plurality (two in the embodiment) of light projecting means 13 for projecting light from the outside of the bottle 1 to the reflecting means 12 are provided. The light projecting means 13 includes a condenser lens 14, a light source 15, and an optical fiber 16 for guiding light from the light source 15 to the condenser lens 14. The light from the condenser lens 14 is
Is set so that light is projected over the entire width of the neck 1a.

A CCD camera 6 for photographing the neck 1a of the bottle 1 from outside is provided between the two light projecting means 13. The CCD camera 6 is connected to an image processing device 7 constituting a determination unit.

Next, the operation of the bottle neck inspection apparatus constructed as described above will be described. The light from the condenser lens 14 is
After being projected on the neck 1 a of the bottle 1, the light is transmitted through the neck 1 a of the bottle 1 and projected on the reflection means 12. The light projected to the reflecting means 12 is reflected by the reflecting means 12 to become diffused light and enters the neck 1a of the bottle 1. After the diffused light enters the bottle, defects can be detected by the same operation as in the embodiment of FIGS.

[0017]

As described above, according to the present invention, since the neck of the bottle is photographed by the diffusely transmitted light from the inside of the bottle, the threads appear vaguely dark, and the defects are clearly dark and only the defects appear. Can be detected.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an entire configuration of an embodiment of a bottle neck inspection apparatus according to the present invention.

FIG. 2 is a view taken in the direction of arrows II-II in FIG.

FIG. 3 (a) is a diagram showing a state of diffuse transmitted light transmitted through a bottle neck, and FIG. 3 (b) is a diagram showing a state of light incident on a screw thread of the bottle neck. .

FIG. 4 is a diagram illustrating an image in an inspection window among images obtained by the image processing apparatus.

FIG. 5 is a schematic view showing the overall configuration of another embodiment of the bottle neck inspection apparatus according to the present invention.

6 is a view taken in the direction of arrows VI-VI in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Glass bottle 1a Neck 1d Crack 1s Thread 2 Diffusing means 3,16 Optical fiber 4,15 Light source 5,13 Light emitting means 6 CCD camera 7 Image processing device 8 Image 10 Support base 12 Reflecting means 14 Condensing lens

Claims (2)

[Claims] 1. A light diffusing means which is inserted into a neck of a bottle and has a cylindrical cross section and is formed of a light diffusing plate; a light projecting means for projecting light into the inside of the diffusing means; a photographing means for photographing the neck; An apparatus for inspecting a neck of a bottle, comprising: means for judging a point which appears dark as a defect. 2. A reflecting means which is inserted into the neck of the bottle and has a circular cross section and a diffuse reflection surface on the side, a light projecting means for projecting light from outside the bottle to the reflecting means, and an image of the neck from the side of the light projecting means. A bottle neck inspection apparatus, comprising: a photographing means for performing a test; and a judging means for judging a point which appears darker than the background as a defect.