JPH01224651A - Detecting device for foreign matter in solution in bottle - Google Patents

Abstract

PURPOSE:To improve the accuracy of foreign matter detection by arranging a camera above the bottle to be inspected, fitting a reflecting mirror to a turntable by the bottle, and picking up an image of the bottle flank by the camera through a reflecting mirror. CONSTITUTION:The bottle 9 to be inspected which flows in a line is fixed on a transparent plate 4 arranged on the turntable 1. The camera 6 is coupled with the turntable 1 and the image of the bottle flank is reflected by the reflecting mirror 11 coupled with the turntable 1 and picked up by the camera 6. The camera 6 is arranged on the rotary shaft of the table 1 to prevent vibration which causes a camera shake, etc., from being generated. This is realized by providing a means for photographing the flank of the bottle 9 indirectly through the reflecting mirror 11. Another CCD camera 6a is installed in the turntable 1 and photographs the bottom part of the bottle 9 through the transparent plate 4. This camera 6a is also arranged on the rotary shaft of the turntable 1 to reduce a force of rotational inertia generated at the time of rotation, thereby preventing vibration which causes a camera shake, etc., from being generated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for detecting foreign substances contained in a liquid contained in a transparent or translucent bottle of drugs, oils, or the like.

[Conventional technology]

The following methods are available for detecting foreign objects in transparent containers.

(1) A method of photographing a bottle with a camera and comparing abnormalities in brightness and color tone in the photographed screen with a normal screen without foreign objects.

(2) A method of extracting foreign substances by giving motion to the fluid, taking two images with the bottle stationary, and calculating the absolute value of the difference between them (2016-167 No.
, 9) [Problems to be Solved by the Invention] The above-mentioned prior art (1) has the following problems.

If there are floating letters or patterns on the bottle9, if the wall thickness is uneven, or if the bottom of the bottle has a complicated shape, it will be difficult to compare with the normal screen and the image processing time will be longer. However, the inspection area is limited to a relatively uniform area, and detection errors are likely to occur.

The prior art (2) described above has the following problems.

Providing movement to the fluid is a necessary condition for foreign object detection.
For this purpose, a method is usually used to rotate the bottle before capturing the image, but when rotating an axially symmetrical bottle, the liquid does not immediately rotate as the bottle rotates due to slippage between the liquid and the bottle. It is necessary to rotate the bottle several times, which takes time. Also, such a rotating device must be provided. Furthermore, bubbles are likely to be generated in the liquid due to the movement of the liquid during image capture and the acceleration applied when the bottles flowing on the line are brought to rest.

When bubbles are generated in this way, they move through the liquid and are erroneously detected as foreign objects.

SUMMARY OF THE INVENTION An object of the present invention is to provide an economical and reliable device for detecting foreign matter in a liquid in a bottle that does not move the liquid, therefore does not require a device for this purpose, and prevents the generation of bubbles. This is what I did.

[Means to solve the problem]

The bottle is fixed to a rotating table, and a camera is attached to the rotating table above the bottle, and a reverberatory furnace is attached to the side of the bottle. The camera and bottle are synchronized to rotate the table by a small angle, during which time two images are captured into the camera via a reflector, and the difference between these images is calculated.

Note that the reflector brings the image of the side of the bottle into the field of view of the camera.

[Effect]

By synchronizing and rotating the bottle and camera, images with different positions of foreign objects can be obtained without moving the liquid. Also,
The upper camera is placed on the axis of the rotating body to image the side of the bottle through a reflecting mirror.

〔Example〕

In Fig. 1, 1 is a rotary table, 2 is a gear fixed to the bottom of the rotary table, 3 is a motor that drives the rotary table 1, 4 is a transparent stand provided on the top of the rotary table 1, and 5 is a rotary table. 6 is a COD camera attached to the top of the support 5; 7 is a fixed outer cylinder that rotatably supports the rotary table 1 via a bearing 8; 9 is a column mounted on the rotary table 1; A fixed bottle to be inspected, 10 is the liquid content of the bottle to be inspected 9, 11 is a rotary table 1
12 is an image processing device.

Bottles 9 flowing along the line are placed and fixed on a transparent plate 4 placed on the top of the rotary table 1.

The rotary table 1 is rotated through a suitable angle by a gear 2 and a motor 3. This rotation angle is appropriately set by providing two proximity switches (see FIG. 2) around the one-turn table 1, and two images of the side surface of the bottle are taken by the camera 6 during this rotation. The camera 6 is rigidly connected to the rotary table 1, and the image of the side of the bottle is also taken from the rotary table 1.
reflected by the reflecting mirror 11 connected to the camera 6 and 9.
be included.

The camera 6 is arranged on the rotation axis of the rotary table 1, and reduces the rotational inertia generated during rotation to prevent vibrations that cause camera shake. This can be realized by providing a means for indirectly photographing the side surface of the bottle 9 on the reflecting mirror 11.

The bottle 9 and the camera 6 are rotated in synchronization with the rotary table 1, and during this time two images are each captured, and these images are processed by an image processing device 12 to extract foreign substances.

In the embodiment shown in FIG. 1, there are other CODs inside the rotary table 1.
A camera 6a is installed, and the camera 6a is mounted on a transparent base 4.
The bottom of the bottle 9 to be inspected is photographed through the camera.

Similarly to the camera 6, the camera 6a takes pictures twice while the rotary table 1 is rotating, and the images are processed by the image processing device 12a.

This camera 6a is also arranged on the rotation axis of the rotary table 1 to reduce the rotational inertia generated during rotation and prevent the generation of vibrations that cause camera shake.

FIG. 2 shows the relationship between the positions of two proximity switches arranged around the rotary table 1 and the rotation of the rotary table viewed from the bottom of the bottle and the image capturing time.

In FIG. 2, the angle θ. Assuming that the reference angle is when the bottle is placed on the transparent plate, the table rotates to θ, and during this time the proximity switch etc. is used to set the table to 81. Two image captures are performed at the angle S2. After completing these series of operations, the bottle 9 is transported from the transparent table 4, and the table 1 is at θ. Return to and inspect the next bottle.

Figure 3 shows the principle of foreign matter extraction. In images 1 and 2 taken at different times, the images of bottles, etc. on the rotary table 1 are taken in synchronization with the rotary table 1, so the images are the same. , the liquid 10 in the bottle slips even when the bottle is suddenly rotated, and there is almost no movement, so the foreign objects floating in the liquid also hardly move, so the images of the foreign objects are shown in images 1 and 2.
A relative deviation occurs between the two. Therefore, by calculating these differences, the images of the bottle and the rotary table are erased, and only the image of the foreign object can be extracted.

〔Effect of the invention〕

In a foreign object detection device, a bottle to be inspected and a camera for photographing the same bottle are fixed on a rotary table, and foreign objects are extracted by subtracting or calculating the absolute value of two images taken from the camera. Place it above the test bottle,
Furthermore, a reflecting mirror is attached to the rotary table on either side of the bottle to be inspected, and the camera captures an image of the side surface of the bottle through the reflecting mirror to detect foreign objects in the liquid in the bottle.
The bottle and camera rotate in synchronization to extract foreign substances without moving the liquid in the bottle. 'Therefore, the generation of bubbles that cause false detection is prevented, and the accuracy of detecting foreign objects is improved.

Additionally, since the camera that photographs the side of the bottle can be placed on the axis of the rotary table, it accompanies the rotation of the table.

The rotational inertia of the camera can be minimized, which is extremely effective in preventing camera shake, and the occupied surface PJ of the inspection device can be made smaller. Therefore, inspection accuracy and reliability are improved, and the effect of improving economic efficiency is also large.

[Brief explanation of the drawing]

Fig. 1 is an embodiment of the present invention, a diagram showing the configuration of the inspection device, Fig. 2 is a diagram showing the rotation table, the temporal and positional relationship between bottle rotation and image capture, and Fig. 3 is the detection principle of foreign material extraction. FIG.

Claims (1)

[Claims] In a foreign object detection device, a bottle to be inspected and a camera for photographing the same bottle are fixed on a rotary table, and foreign objects are extracted by subtracting or calculating the absolute value of two images taken from the camera. Place it above the test bottle,
The device for detecting foreign substances in a liquid in a bottle further comprises: a reflecting mirror is attached to the rotating table on the side of the bottle to be inspected, and the camera captures an image of the side surface of the bottle via the reflecting mirror.