WO2019059097A1

WO2019059097A1 - Foreign object inspection apparatus

Info

Publication number: WO2019059097A1
Application number: PCT/JP2018/034014
Authority: WO
Inventors: 戸塚　宏幸
Original assignee: キリンテクノシステム株式会社
Priority date: 2017-09-19
Filing date: 2018-09-13
Publication date: 2019-03-28
Also published as: KR102627123B1; JP2019053000A; KR20200054233A; JP6996736B2; CN111094951A

Abstract

The present invention pertains to a foreign object inspection apparatus for inspecting whether there is a foreign object in a translucent container by imaging the bottom part of the translucent container such as a glass bottle. Light emitted from an illumination device (3) is divided into first light (L1) that is reflected on the inner surface (1b) of the bottom part (1a) of a translucent container (1) and second light (L2) that advances within the bottom part (1a) and is then reflected on the outer surface (1c) of the bottom part (1a). An imaging device (5) is disposed at a position that allows the first light (L1) to be received and that causes an angle α, at which the second light (L2) reflected on the outer surface (1c) is incident on the inner surface (1b), to be larger than a critical angle.

Description

Foreign substance inspection device

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a foreign matter inspection apparatus for imaging the bottom of a translucent container such as a glass crucible to inspect whether there is a foreign object in the translucent container.

In a glass crucible filled with a liquid such as a beverage, foreign substances such as metal pieces or glass pieces may be mixed. Foreign matter is often deposited at the bottom of the glass crucible. Therefore, after filling the liquid such as the beverage in the glass bottle, it is checked whether foreign matter is precipitated at the bottom of the glass bottle. As an apparatus for detecting a foreign substance, there is a foreign substance inspection apparatus which detects a foreign substance by image processing (see, for example, Patent Document 1). Specifically, while the glass crucible is being conveyed by the conveyance device, the camera captures the bottom of the glass crucible from obliquely below the glass crucible and detects foreign matter from the obtained image. Since the foreign matter appears as white or black shadows on the image, it is possible to detect the presence or absence of the foreign matter by image processing.

JP 2004-317426 A JP 2003-107011 JP 2012-42365

The outer surface of the bottom of the glass bottle may usually be embossed or engraved with letters or numbers. Since such emboss and imprint similarly appear on the image as shadows, the conventional foreign matter inspection apparatus may detect the emboss and imprint as foreign matter. Therefore, in order to detect foreign matter with high accuracy, there is a foreign matter inspection apparatus which spins the container after spinning the container filled with the liquid and stops the spin of the container to detect foreign matter moving in the liquid (see Patent Document 2). However, this type of foreign matter inspection device requires a special conveyance device for spinning the container, and not only does the entire foreign matter inspection device become large, but it is not possible to use an existing conveyance device in a factory.

As a device for inspecting a container without spinning the container, there is a foreign matter inspection device that illuminates from above the container and receives transmitted light transmitted through the bottom of the container by an imaging unit disposed below the container to generate an image. (See Patent Document 3). However, even in this apparatus, in order to image the bottom of the container from below, a special transfer device is required to transfer the container while sandwiching the both sides of the container.

Therefore, according to the present invention, foreign substances in the translucent container transported by the existing transport device can be accurately obtained without being affected by the emboss or marking formed on the bottom of the translucent container such as a glass bottle. An object of the present invention is to provide a foreign matter inspection apparatus capable of detecting.

According to one aspect of the present invention, there is provided an illumination device disposed on the side of a translucent container transported by a transport device and illuminating the translucent container filled with liquid, and the illumination device sandwiching the transport device. And an imaging device for generating an image of the bottom of the translucent container, and an image processing device for processing the image of the bottom, and the light emitted from the lighting device is on the inner surface of the bottom At a position where the imaging device can receive the first light when it is split into a first light reflected by the second light and a second light traveling in the bottom and reflected by the outer surface of the bottom The foreign substance inspection device according to claim 1, wherein the incident angle of the second light reflected by the outer surface to the inner surface is larger than a critical angle.

A preferred aspect of the present invention is characterized in that the imaging device is disposed at a position higher than the inner surface of the bottom of the translucent container on the transport device.
In a preferred aspect of the present invention, the image pickup apparatus includes a reflection mirror disposed at a position where the first light can be received.

When the incident angle of the second light traveling toward the liquid in the bottom of the translucent container is larger than the critical angle, the second light is totally reflected on the inner surface of the bottom and the second light is reflected on the liquid It does not progress. According to the present invention, since the imaging device does not receive the second light, the image generated by the imaging device does not show any emboss or imprint formed on the outer surface of the bottom. As a result, the foreign matter inspection apparatus can accurately detect foreign matter in the translucent container without being affected by emboss or marking.

According to the present invention, the imaging device can be disposed to the side of the translucent container. Therefore, as a transfer apparatus for transferring the translucent container, a general type transfer apparatus such as a straight conveyor can be used. Therefore, the foreign matter inspection apparatus according to the present invention can inspect the translucent container by using the transport device already installed in the factory as it is.

It is a front view which shows one Embodiment of the foreign material inspection apparatus of this invention. It is a top view of the foreign material inspection apparatus shown in FIG. It is a schematic diagram which shows a mode that the diffused light emitted from the illuminating device is reflected by the inner surface of the bottom part of a glass bottle. It is a figure explaining the position of an imaging device. It is a figure which shows the mode of advancing of light when the incident angle of the 2nd light to the inner surface of the glass crucible bottom part is smaller than a critical angle. It is a figure which shows the image produced | generated by the imaging device arrange | positioned in the position whose incident angle of 2nd light is larger than a critical angle shown in FIG. It is a figure which shows the image produced | generated by the imaging device arrange | positioned in the position whose incident angle of 2nd light is smaller than a critical angle shown in FIG. It is a figure which shows other embodiment of a foreign material inspection apparatus. It is a figure which shows other embodiment of a foreign material inspection apparatus.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing an embodiment of a foreign matter inspection apparatus according to the present invention, and FIG. 2 is a top view of the foreign matter inspection apparatus shown in FIG. In FIG. 1 and FIG. 2, the code | symbol 1 represents the glass crucible which is an example of a translucent container. The foreign matter inspection apparatus of the present embodiment inspects whether or not there is a foreign matter in the bottom portion 1 a of the glass crucible 1 in a state where the liquid such as a beverage is filled.

The foreign matter inspection apparatus comprises an illumination device 3 for illuminating the glass crucible 1 filled with liquid, and an imaging device 5 for generating an image of the bottom 1a of the glass crucible 1 from light reflected by the inner surface 1b of the bottom 1a of the glass crucible 1 And an image processing device 7 that processes an image generated by the imaging device 5. The illumination device 3 and the imaging device 5 are disposed on both sides of the transport device 10. That is, the illumination device 3 is disposed on the side of the glass bottle 1 conveyed by the conveyance device 10, and the imaging device 5 is disposed to face the illumination device 3 with the conveyance device 10 interposed therebetween. In the present embodiment, the imaging device 5 is disposed to the side of the conveyance device 10, and is disposed at a position higher than the conveyance surface 10a of the conveyance device 10 (mounting surface of the glass bottle 1).

The lighting device 3 is configured to emit diffused light, and a light emitting diode, for example, is used as a light source of the lighting device 3. The imaging device 5 includes a camera 5a provided with an image sensor such as a CCD or a CMOS. The illumination device 3 irradiates the bottom 1a of the glass bottle 1 with diffused light, and the imaging device 5 receives the light reflected from the bottom 1a of the glass crucible 1 with an image sensor to generate an image of the bottom 1a of the glass crucible 1 Is configured.

In the present embodiment, as shown in FIG. 1, the imaging device 5 is disposed at a position higher than the inner surface 1 b of the bottom portion 1 a of the glass bottle 1 on the transfer device 10. More specifically, the camera 5 a of the imaging device 5 is inclined downward toward the inner surface 1 b of the bottom portion 1 a of the glass bottle 1 on the transfer device 10. In one example, the angle of the imaging device 5 with respect to the inner surface 1b of the bottom portion 1a of the glass bottle 1 is less than 10 degrees.

The foreign substance inspection apparatus inspects the glass crucible 1 as follows. The glass crucible 1 is transported by the transport device 10 at a predetermined speed. As shown in FIG. 2, the transport device 10 is a linear conveyor, and transports a plurality of glass crucibles 1 at regular intervals. The illumination device 3 illuminates the bottom 1a of the glass crucible 1 being moved by the transport device 10, while the imaging device 5 receives the light reflected by the inner surface 1b of the bottom 1a of the glass crucible 1 and generates an image of the bottom 1a. Do.

The image processing device 7 receives an image from the imaging device 5 and performs image analysis. More specifically, the image processing device 7 determines whether or not there is a foreign matter in the bottom portion 1a of the glass bottle 1 based on the image of the bottom portion 1a. Since the foreign matter appears in the image as a white or black shadow, the image processing device 7 can detect the foreign matter based on the image. When a foreign matter is detected in the glass crucible 1, the image processing device 7 may transmit an alarm signal. In the same manner, the imaging device 5 and the image processing device 7 sequentially inspect the plurality of glass crucibles 1 transported by the transport device 10.

The illumination device 3 is a so-called surface illumination, and is configured to be able to emit light in a wide area from multiple areas. FIG. 3 is a schematic view showing how diffused light emitted from the lighting device 3 is reflected by the inner surface 1 b of the bottom portion 1 a of the glass bottle 1. As shown in FIG. 3, the inner surface 1 b of the bottom portion 1 a of the glass crucible 1 generally has a curved shape that protrudes upward. Diffuse light emitted from the lighting device 3 is incident on the inner surface 1b of the bottom portion 1a at various incident angles, and is reflected on the inner surface 1b. The reflected light passes through the side surface 1 d of the glass bottle 1, and the imaging device 5 receives part of the light reflected by the inner surface 1 b of the bottom portion 1 a of the glass rod 1. In the example shown in FIG. 3, the light indicated by the dashed dotted line is received by the imaging device 5, but the light indicated by the dotted line is not received by the imaging device 5. Therefore, the range irradiated with the light indicated by the dashed dotted line is the inspection range.

FIG. 4 is a diagram for explaining the position of the imaging device 5. The imaging device 5 is disposed at a position where the following light can be received among the light reflected by the inner surface 1 b of the bottom portion 1 a of the glass bottle 1. That is, the first light L1 reflected by the inner surface 1b of the bottom 1a of the glass bottle 1 travels through the bottom 1a and the second light reflected by the outer surface 1c of the bottom 1a. When divided into L2, the imaging device 5 is at a position where it can receive the first light L1 reflected by the inner surface 1b of the bottom portion 1a, and to the inner surface 1b of the second light L2 reflected by the outer surface 1c. The incident angle α is disposed at a position larger than the critical angle. The imaging device 5 disposed at such a position does not receive the second light L2 reflected by the outer surface 1c of the bottom portion 1a of the glass bottle 1, and thus generates an image in which the emboss 15 formed on the outer surface 1c does not appear can do.

In general, it is known that light is totally reflected at an interface between media when the incident angle of light traveling from a medium having a large refractive index to a medium having a small refractive index is larger than a critical angle. Since the refractive index of the glass crucible 1 is higher than the refractive index of the liquid in the glass crucible 1, there is a critical angle at the incident angle α of the second light L2 traveling from the bottom 1a of the glass crucible 1 to the liquid. The critical angle is calculated in advance from the refractive index of the glass crucible 1 and the refractive index of the liquid. When the incident angle α of the second light L2 is larger than the critical angle, as shown in FIG. 4, the second light L2 is totally reflected by the inner surface 1b of the bottom portion 1a, and the second light L2 travels in the liquid do not do. Therefore, the second light L2 does not reach the imaging device 5.

FIG. 5 is a diagram showing the progress of light when the incident angle α of the second light L2 is smaller than the critical angle. When the incident angle α of the second light L2 is smaller than the critical angle, part of the second light L2 travels from the bottom portion 1a of the glass bottle 1 to the liquid and transmits the liquid, as shown in FIG. To the imaging device 5. In this case, the emboss 15 appears in the image generated by the imaging device 5.

6 is a view showing an image generated by the imaging device 5 disposed at a position where the incident angle α of the second light L2 is larger than the critical angle shown in FIG. It is a figure which shows the image produced | generated by the imaging device 5 arrange | positioned in the position whose incident angle (alpha) of the 2nd light L2 is smaller than a critical angle. The angle of the imaging device 5 with respect to the inner surface 1b of the bottom 1a of the glass crucible 1 when acquiring the image of FIG. 6 is less than 10 degrees, and the inner surface of the bottom 1a of the glass crucible 1 when the image of FIG. The angle of the imaging device 5 with respect to 1 b was about 30 degrees.

As can be seen from FIGS. 6 and 7, while the foreign material 20 and the emboss 15 appear in the image shown in FIG. 7, the foreign material 20 appears in the image shown in FIG. Absent. As described above, the foreign matter inspection apparatus according to the present embodiment accurately detects foreign matter in the glass crucible 1 without being affected by the emboss or marking formed on the outer surface 1 c of the bottom portion 1 a of the glass crucible 1. Can.

The imaging device 5 can be disposed to the side of the glass crucible 1. In the present embodiment, the imaging device 5 is disposed at a position higher than the inner surface 1 b of the bottom portion 1 a of the glass bottle 1 on the transfer device 10. As described above, the position and the angle of the imaging device 5 are not particularly limited as long as the first light L1 can be received and the incident angle α of the second light L2 is larger than the critical angle. . Therefore, as the transfer apparatus 10 for transferring the glass bottle 1, a general type transfer apparatus such as a straight conveyor can be used. Therefore, the foreign substance inspection apparatus according to the present embodiment can inspect the glass bottle using the transport apparatus already installed in the factory as it is.

FIG. 8 is a view showing another embodiment of the foreign matter inspection apparatus. The configuration and operation of the present embodiment, which is not particularly described, is the same as the embodiment shown in FIG. 1 and FIG. In the embodiment shown in FIG. 8, the imaging device 5 includes a reflection mirror 5 b disposed between the camera 5 a and the conveyance device 10. The light reflected by the inner surface 1b of the bottom portion 1a of the glass bottle 1 is further reflected by the reflection mirror 5b and reaches the camera 5a. The camera 5a is disposed above the reflection mirror 5b.

Also in the present embodiment, the reflection mirror 5b of the imaging device 5 is disposed at the same position as the imaging device 5 shown in FIG. That is, the reflection mirror 5b is a position that can receive the first light L1 reflected by the inner surface 1b of the bottom portion 1a of the glass bottle 1, and to the inner surface 1b of the second light L2 reflected by the outer surface 1c. The incident angle α is disposed at a position larger than the critical angle. Therefore, the foreign matter inspection apparatus according to the present embodiment can accurately detect the foreign matter in the glass crucible 1 without being affected by the emboss or marking formed on the outer surface 1 c of the bottom portion 1 a of the glass crucible 1. . Further, since the camera 5a can receive the first light L1 through the reflection mirror 5b, the degree of freedom of the installation position of the camera 5a is increased. In one embodiment, the camera 5a may be disposed below the reflective mirror 5b.

FIG. 9 is a view showing still another embodiment of the foreign matter inspection apparatus. The configuration and operation of the present embodiment, which is not particularly described, is the same as the embodiment shown in FIG. 1 and FIG. In the embodiment shown in FIG. 9, a plurality of

imaging devices

5, 22 and 23 are provided. These

imaging devices

5, 22, 23 are disposed on the opposite side of the transport device 10 to the lighting device 3, and all face the lighting device 3. Like the imaging device 5, the

imaging devices

22 and 23 can receive the first light L1 and at a position and an angle that satisfy the condition that the incident angle α of the second light L2 is larger than the critical angle. It is arranged. The image processing device 7 is connected to the

imaging devices

5, 22 and 23, and configured to process the images sent from these

imaging devices

5, 22 and 23 to detect foreign substances in the glass crucible 1. It is done.

In the present embodiment, in addition to the imaging device 5 shown in FIG. 2, the two

imaging devices

22 and 23 are disposed on both sides of the imaging device 5, but more imaging devices may be provided. The foreign matter inspection apparatus according to the present embodiment can inspect a plurality of glass crucibles 1 simultaneously, and the throughput is improved. The reflecting mirror 5b shown in FIG. 8 can also be applied to the embodiment of FIG.

The embodiments described above are described for the purpose of enabling one skilled in the art to which the present invention belongs to to practice the present invention. Various modifications of the above-described embodiment can naturally be made by those skilled in the art, and the technical idea of the present invention can be applied to other embodiments. Accordingly, the present invention is not limited to the described embodiments, but is to be construed in the broadest scope in accordance with the technical concept defined by the claims.

INDUSTRIAL APPLICABILITY The present invention is applicable to a foreign matter inspection apparatus for imaging the bottom of a translucent container such as a glass crucible and inspecting whether there is a foreign object in the translucent container.

DESCRIPTION OF SYMBOLS 1 Glass plate 3 lighting apparatus 5 imaging apparatus 5a camera 5b reflective mirror 7 image processing apparatus 10 conveyance apparatus 15 embossing 20

foreign object

22 and 23 imaging apparatus L1 1st light L2 2nd light

Claims

An illumination device disposed on the side of the translucent container transported by the transport device and illuminating the liquid-filled translucent container;
An imaging device that is disposed to face the lighting device with the transport device interposed therebetween, and generates an image of the bottom of the translucent container;
An image processing apparatus for processing the image on the bottom;
When the light emitted from the lighting device is divided into a first light reflected by the inner surface of the bottom and a second light traveling in the bottom and reflected by the outer surface of the bottom, the imaging device Is located at a position where the first light can be received, and the incident angle of the second light reflected by the outer surface to the inner surface is larger than a critical angle. Foreign substance inspection device.
The foreign matter inspection apparatus according to claim 1, wherein the imaging device is disposed at a position higher than the inner surface of the bottom of the translucent container on the transport device.
The foreign matter inspection apparatus according to claim 1, wherein the imaging device includes a reflection mirror disposed at a position where the first light can be received.