CN110546650A - container inspection device and container inspection method - Google Patents
container inspection device and container inspection method Download PDFInfo
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- CN110546650A CN110546650A CN201780090027.6A CN201780090027A CN110546650A CN 110546650 A CN110546650 A CN 110546650A CN 201780090027 A CN201780090027 A CN 201780090027A CN 110546650 A CN110546650 A CN 110546650A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V30/00—Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
- G06V30/10—Character recognition
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- General Physics & Mathematics (AREA)
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- Computer Vision & Pattern Recognition (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
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Abstract
An inspection device (1) for a container (10) comprises: a light-emitting unit (20) that irradiates light onto a concave-convex shape (17) formed on the outer surface (16) of the container (10); a rotation support part (30) which supports the container (10) which rotates around the central shaft (12); a condenser lens (42) that projects, onto a screen (44), light reflected by the container (10) out of the light emitted by the light emitting unit (20); and an imaging unit (40) that images the image projected onto the screen (44). The uneven shape (17) can contain characters, and the inspection device (1) can contain a processing unit (50) for recognizing the characters from an image (80) captured by the imaging unit (40).
Description
Technical Field
The present invention relates to a container inspection apparatus and a container inspection method.
background
A model reading device for reading characters or symbols formed in a concave-convex shape formed on an outer surface of a container, particularly a glass bottle, is known (non-patent document 1). The uneven shape is a shape protruding from the outer surface of the glass bottle, a shape recessed from the outer surface to the inside, or a shape formed by a combination of a protruding shape and a recessed shape. A typical type reading device for glass bottles optically reads a type (mold number) formed as a concave-convex shape on the bottom or lower edge of the bottle, and the read type is used for quality control together with defect information from an inspection machine that inspects the quality of the bottle. That is, the inspection results of the bottles are automatically collected for each mold corresponding to the read characters, so that it is possible to know what kind of defect has occurred in the bottle molded by which mold. As a result, for example, data obtained by summarizing the bottle quality for each mold can be fed back to the operator of the molding machine, or only bottles manufactured in a specific model can be excluded from the production line.
As disclosed in non-patent document 1, the arrangement of the optical system of the model reading apparatus is generally classified according to whether the light received by the light receiver is reflected light or transmitted light. The reflection type is a type in which light from a light projector reflected from a glass bottle is read by a light receiver. The transmission type is a type in which light transmitted through a light projector of a glass bottle is read by a light receiver.
An inspection apparatus previously proposed by the applicant of the present application is a typical example of a transmissive character reading apparatus (patent document 1). The transmission type character reading device is an epoch-making device that solves the difficulty of reading characters on a transparent (or translucent) glass bottle. In this transmissive character reading apparatus, the embossed characters are projected onto the screen by using the lens effect of the embossed characters, thereby facilitating the identification of the model.
According to the invention of patent document 1, although it is possible to reduce the erroneous recognition of the model number on the transparent (or translucent) glass bottle, it is necessary to secure a space for disposing the illuminating body on the rear side of the glass bottle.
In recent years, a reflection-type character reading device (container inspection system) has also been proposed (patent document 2). However, this document reading apparatus does not disclose a specific solution of how to use reflected light to clarify the contour of the concave-convex shape on a transparent (or translucent) glass bottle. In addition, in the reflection-type character reading apparatus, it has been found that a double reflection shadow of characters (concave-convex shape) occurs in a transparent glass bottle. Such double-reflected shadows are captured at a gradation close to the character shadows, and thus cause a reading error or misreading. Moreover, a read error or the like may affect the processing at the subsequent stage.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 2008-158943
patent document 2: international publication No. 2014-50641
Non-patent document
Non-patent document 1: "ガ ラ ス responsible for" its "5 th screen (technical field 5 th volume for glassmaking)", published by society of japan glass industries association, 1993, 6 and 3 days, p.241-265
Disclosure of Invention
Problems to be solved by the invention
The present invention aims to provide a container inspection device and a container inspection method capable of inspecting the concave-convex shape of the outer surface of a container.
Means for solving the problems
The present invention has been made to solve at least part of the above problems, and can be implemented as the following aspects or application examples.
[ application example 1]
The inspection apparatus for a container according to the application example includes:
a light emitting unit that irradiates light onto a concave-convex shape formed on an outer surface of a container;
A rotation support part which supports the container rotating around the central axis of the container;
A condenser lens for projecting light reflected by the container out of the light emitted from the light emitting unit onto a screen; and
and an imaging unit that images the image projected onto the screen.
According to this application example, the concave-convex shapes of the outer surfaces of the colored container and the colorless transparent container can be reliably inspected using the reflective optical system.
[ application example 2]
in the inspection apparatus for a container according to the present application example, it is possible to,
The concave-convex shape includes characters,
The image processing device further comprises a processing part for recognizing characters from the image shot by the shooting part.
According to this application example, the characters on the outer surface of the container can be reliably recognized using the reflection-type optical system.
[ application example 3]
In the inspection apparatus for a container according to the present application example, it is possible to,
A diffusion plate is further provided between the light emitting part and the container,
the diffusion plate diffuses light from the light emitting unit and irradiates the light to the container.
According to the present application example, even if the concave-convex shape is formed on the curved surface of the container, the reflected light can be efficiently utilized.
[ application example 4]
in the inspection apparatus for a container according to the present application example, it is possible to,
The imaging unit, the condenser lens, the screen, and the light emitting unit are fixed to 1 substrate.
According to this application example, each part can be arranged at an appropriate position in a short time by changing the position of the substrate according to the type of the container to be inspected.
[ application example 5]
In the inspection apparatus for a container according to the present application example, it is possible to,
The uneven shape formed on the outer surface of the container is a character protruding from the outer surface of the container.
According to this application example, characters protruding from the outer surface of the container can be reliably read.
[ application example 6]
The inspection method for a container according to the present application example is characterized in that,
The container is rotated around the central axis of the container,
Light is emitted from the light emitting section toward the uneven shape formed on the outer surface of the container,
The reflected light from the container is projected by a condenser lens to a screen,
The image of the screen is photographed by a photographing part.
According to this application example, the concave-convex shape of the outer surface of the container can be reliably inspected using the reflection-type optical system.
[ application example 7]
In the inspection apparatus for a container according to the present application example, it is possible to,
The concave-convex shape includes characters,
Characters are recognized from the image captured by the image capturing unit.
According to this application example, the characters on the outer surface of the container can be reliably recognized using the reflection-type optical system.
[ application example 8]
In the inspection apparatus for a container according to the present application example, it is possible to,
The light emitted from the light emitting section is diffused by the diffusion plate and is irradiated to the uneven shape formed on the outer surface of the container.
According to the present application example, even if the concave-convex shape is formed on the curved surface of the container, the reflected light can be efficiently utilized.
[ application example 9]
In the inspection apparatus for a container according to the present application example, it is possible to,
The diffusion plate has a diffusion angle which is uniform to a predetermined angle as a whole,
The diffusion angle is 10-40 degrees.
According to this application example, the diffusion angle of the diffusion plate is made uniform as a whole, whereby the shadow of the uneven shape projected on the screen can be made clear. Further, according to the present application example, by making the diffusion angle of the diffusion plate 22 uniform as a whole, even if the curvature of the lower edge portion of the container is small, the width of the bright background projected around the uneven shape of the screen is not easily narrowed.
Effects of the invention
The present invention can provide a container inspection device and a container inspection method that can inspect the uneven shape of the outer surface of a container.
Drawings
Fig. 1 is a plan view of an inspection apparatus for a container.
fig. 2 is a plan view of the inspection unit showing the arrangement of the light emitting unit, the imaging unit, and the container.
Fig. 3 is a side view of an inspection unit of the container.
fig. 4 is a plan view illustrating a relationship between the light emitting section and the diffusion plate.
Fig. 5 is a front view illustrating a lower edge portion of the container and a screen.
fig. 6 is a diagram illustrating characters in a captured image.
fig. 7 is a flow chart of a method of inspecting a container.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below are not intended to unduly limit the scope of the present invention set forth in the claims. All the configurations described below are not necessarily essential components of the present invention.
The inspection apparatus for a container according to the present embodiment includes: a light emitting unit that irradiates light onto a concave-convex shape formed on an outer surface of a container; a rotation support part which supports the container rotating around the central axis of the container; a condenser lens for projecting light reflected by the container out of the light emitted from the light emitting unit onto a screen; and an imaging unit that images the image projected onto the screen.
1. outline of inspection apparatus for container
An outline of the inspection apparatus 1 for the container 10 will be described with reference to fig. 1. Fig. 1 is a plan view of an inspection apparatus 1 (hereinafter referred to as "inspection apparatus 1") for a container 10.
As shown in fig. 1, the inspection apparatus 1 includes a carrying-in port 78, a carrying path 72, a carrying-out port 79, and an inspection unit 2, which are disposed on a chassis 70. The inspection apparatus 1 further includes a control unit 61 for controlling the entire apparatus.
The conveyance path 72 is formed in a circumferential shape centered on a conveyance center axis 75. The container 10 is conveyed on the conveying path 72 in the clockwise direction of fig. 1.
The containers 10 are intermittently carried into the conveyance path 72 from the carrying-in port 78 of the inspection apparatus 1. The conveying path 72 is provided with the rotation support portions 30 (only 1 is illustrated in fig. 1) for supporting the containers 10 one by one. The containers 10 are intermittently conveyed to the respective tables on the conveying path 72 while being supported by the rotation support portion 30.
The inspection station 74 is provided in the middle of the conveyance path 72 of the containers 10, and can sequentially inspect the containers 10 conveyed to the inspection station 74. By providing the inspection station 74 in the middle of the conveyance path 72, the containers 10 can be sequentially inspected efficiently in the middle of conveyance of the containers 10. On the conveyance path 72, the inspection unit 2 is provided at one of the inspection stations 74. Although not described in the present embodiment, the inspection station 74 can perform an inspection different from the inspection items in the inspection unit 2.
the container 10 stopped at the inspection station 74 of the inspection unit 2 rotates around the center axis 12 of the container 10 together with the rotation support 30. The conveyance path 72 is not limited to a circular shape, and may be formed in other shapes, for example, a straight shape.
The container 10 is a glass bottle. As the container 10, any other container may be used as long as it is made of a material that reflects light. As for the glass bottle, not only a conventional colored glass bottle which is advantageous for a reflection-type optical system but also a colorless transparent (Flint) glass bottle can be an inspection target.
1-1. rotation support part
The rotation support portion 30 will be described with reference to fig. 2 and 3. Fig. 2 is a plan view of the inspection unit 2 showing the arrangement of the light emitting unit 20, the imaging unit 40, and the container 10, and fig. 3 is a side view of the inspection unit 2 of the container 10.
As shown in fig. 2 and 3, the rotation support 30 supports the container 10 that rotates about the central axis 12. The rotation support 30 rotates together with the container 10 while supporting the bottom 14 of the container 10. The central axis 12 is an imaginary line that becomes a rotation central axis of the container 10. The side rollers 32 rotate the container 10 about the central axis 12. The rotation support portion 30 may be configured not to rotate together with the container 10, as long as it supports at least the container 10 that rotates.
The rotation support 30 is a member for conveying the container 10 to a predetermined position for inspection shown in fig. 2 and 3 while supporting the container 10. Therefore, the containers 10 are intermittently conveyed in sequence to a predetermined position to be inspected by the rotary support 30, and after being arranged at the predetermined position, the containers 10 are rotated about the central axis 12 by the rotation of the side rollers 32. Instead of transporting the containers 10 by the rotary support 30, the containers 10 may be intermittently transported to the inspection station 74 in sequence by using star wheels provided on the transport path 72, for example. In this case, the rotation support portion 30 is disposed at each inspection station 74.
as shown in fig. 3, the side rollers 32 transmit the driving force of the motor 60 to the container 10 via the belt 35 or the like in accordance with the instruction of the rotation control section 62 of the control section 61, and rotate the container 10. When the container 10 is conveyed to the inspection position, the side rollers 32 rotate at a predetermined speed by a predetermined amount in accordance with the instruction of the rotation control unit 62. The predetermined amount of rotation is an amount sufficient to photograph the entire circumference of the container 10. The predetermined number of rotations is set to, for example, 1.2 or more rotations so that the entire circumference of the specimen can be grasped by 1 image data. The control unit 61 calculates the rotation amount of the side roller 32 as the rotation amount of the container 10 based on the output of the rotation detection unit 54. The rotation detecting unit 54 may be a rotary encoder directly or indirectly attached to the motor 60.
The control unit 61 and the processing unit 50 described later, although not shown, may include a calculation unit (CPU, etc.), a storage unit (ROM, RAM, HDD, etc.), a communication unit (communication interface, etc.), and a display unit (display, etc.), respectively.
2. inspection unit
the inspection unit 2 will be described with reference to fig. 2 and 3.
As shown in fig. 2 and 3, the inspection unit 2 includes: a light emitting unit 20 that irradiates the uneven shape 17 formed on the outer surface 16 of the container 10 with light; a rotation support 30 for supporting the container 10 to rotate about the central axis 12; a condenser lens 42 that projects light reflected by the container 10 out of the light from the light emitting unit 20 onto a screen 44; and an imaging unit 40 that images the image projected on the screen 44. The inspection unit 2 can reliably inspect the uneven shape 17 of the outer surface 16 of the colored container and the colorless transparent container 10 using a reflection-type optical system. The inspection unit 2 further includes a processing unit 50 that performs image processing and character recognition processing. The inspection unit 2 can be mounted to the existing inspection apparatus 1 as an additional configuration together with the processing unit 50.
The inspection unit 2 can take an image of the uneven shape 17 formed on the outer surface 16 of the container 10 and perform a predetermined inspection based on the taken image. The predetermined inspection includes, for example, identifying the model number of the mold in which the container 10 is molded from the uneven shape 17. In addition, as the predetermined inspection, for example, a defect on the outer surface 16 of the container 10 may be inspected.
The concave-convex shape 17 is a symbol, and includes an arabic numeral, a letter, a dot, and the like. The symbols used for the glass bottles include a manufacturing factory symbol designated by each glass bottle manufacturer, a mold number, and the like. For example, a combination of an arabic numeral and a letter is sometimes used as a symbol in japan, and a dot or the like is sometimes used as a symbol in japan.
When the uneven shape 17 is a character, the processing unit 50 recognizes the character from the image captured by the imaging unit 40. The inspection unit 2 can reliably recognize the characters on the outer surface 16 of the container 10 using the reflection-type optical system.
next, details of each part of the inspection unit 2 will be described.
2-1. light emitting part
the light emitting unit 20 will be described with reference to fig. 2 to 4. Fig. 4 is a plan view illustrating the relationship between the light emitting unit 20 and the diffuser 22.
As shown in fig. 2 and 3, light emitting unit 20 is fixed to substrate 48, and irradiates uneven shape 17 formed on outer surface 16 of container 10 with light.
the light emitting unit 20 is a light source for illuminating the container 10. The light emitting unit 20 can be a point light source illuminator, for example. The point Light source illuminator includes a Light source such as an LED (Light Emitting Diode) and a condenser lens capable of condensing Light to a predetermined range at a predetermined distance. The light emitting unit 20 may be a point light source illuminator that emits parallel light. The light emitting unit 20 is not limited to a point light source illuminator, and may be any other known illuminator as long as the reflected light from the container 10 has sufficient brightness for imaging.
The inspection unit 2 further includes a diffusion plate 22 between the light emitting portion 20 and the container 10. The diffusion plate 22 can diffuse the light from the light emitting unit 20 and irradiate the container 10 with the light. The light emitting portion 20 and the diffusion plate 22 are fixed to the mounting rail 24, and the mounting rail 24 is fixed to the base plate 48. The diffusion plate 22 eliminates the brightness unevenness of the light from the light emitting section 20 and diffuses the parallel light from the light emitting section 20 at a predetermined angle. The light transmitted through the diffusion plate 22 can uniformly illuminate the outer surface 16 of the container 10 in a predetermined range with the unevenness of brightness eliminated. By using the diffusion plate 22, even if the uneven portion 17 is formed in the curved portion of the container 10, the reflected light can be used efficiently. The light emitting unit 20 and the diffusion plate 22 may be integrated to emit diffused light to irradiate the container 10.
The range in which the outer surface 16 of the container 10 is illuminated by the light emitting unit 20 and the diffusion plate 22 is set to be at least the range of the uneven shape 17 imaged by the imaging unit 40 described later. For example, in the case where a point light source illuminator having a circular illumination shape is used as the light emitting portion 20, the range is set so that a range including at least the entire height of the uneven shape 17 is illuminated.
As shown in fig. 3, the concave-convex shape 17 is generally formed on the lower edge portion 15 of the container 10. This is because the cylindrical trunk portion 13 is generally used as a label surface for displaying the contents. Since the uneven portion 17 is formed on the curved lower edge portion 15 connecting the trunk portion 13 and the bottom portion 14, the brightness of the reflected light is excessively high or excessively low when only the parallel light is irradiated. When the uneven portion 17 is provided on the lower edge portion 15, relatively uniform reflected light can be obtained by using the diffusion plate 22.
The diffusion plate 22 preferably has a diffusion angle which is uniform as a whole at a predetermined angle. By making the diffusion angle of the diffusion plate 22 uniform as a whole, it is possible to make the shadow of characters or the like projected on the screen 44 clear. Further, by making the diffusion angle of the diffusion plate 22 uniform as a whole, even if the curvature of the lower edge portion 15 of the container 10 is small, the width of the bright background around the characters or the like projected on the screen 44 is not easily narrowed. In addition, the bright background will be described later using fig. 6. As a result of an experiment for recognizing the image of the uneven shape 17 in the imaging section 40, it was found that it is preferable that the diffusion angle of the diffusion plate 22 is 10 ° to 40 °. In fig. 4, the diffusion angle of the diffusion plate 22 is represented by θ 1. The diffusion angle is an angle of diffusion of light transmitted through the diffusion plate with respect to the incident light from the light emitting section 20. The diffusion angle of the diffusion plate 22 is more preferably 25 ° to 35 °.
2-2. condensing lens
As shown in fig. 2 and 3, the condenser lens 42 projects light reflected by the container 10 out of the light from the light emitting unit 20 onto the screen 44. The condenser lens 42 is disposed at a position capable of receiving light regularly reflected by the outer surface 16 (region including the uneven portion 17) of the container 10 among the light from the light emitting portion 20.
The condenser lens 42 includes a plurality of lenses and condenses the light reflected by the container 10. The condenser lens 42 is disposed on the substrate 48 so that the image of the uneven shape 17 is projected onto the screen 44 by reflected light. Specifically, the condenser lens 42 is mounted on the container 10 side of the lens fixing plate 43 fixed to the base plate 48 at the lower end thereof. As shown in fig. 2 and 3 (a part of which is shown in cross section), the lens fixing plate 43 is formed with a through hole, and can project the light collected by the condenser lens 42 toward the screen 44.
the screen 44 is a translucent sheet, and for example, a screen made of the same material as the diffusion plate 22 can be used. The light from the condenser lens 42 is projected onto the screen 44, and the screen 44 can reflect the image of the uneven shape 17. The screen 44 can employ a so-called transmission type screen having a diffusion layer.
The screen 44 is fixed to a screen fixing plate 45 whose lower end is fixed to the substrate 48, and is fixed so as to close a through hole provided in the screen fixing plate 45.
by projecting the image of the uneven portion 17 on the screen 44 by the condenser lens 42, the depth of field of the imaging unit 40 can be reduced, and double reflection of the uneven portion 17 can be prevented even when the container 10 is a transparent glass bottle. The double reflection means that, when a transparent glass bottle is imaged in a conventional reflection optical system, not only the reflected light of the uneven shape 17 but also the reflected light of the image of the uneven shape 17 reflected on the inner surface of the container 10 are imaged by the camera, and therefore, a double image of the uneven shape 17 is imaged. Therefore, the original contour of the uneven pattern 17 cannot be clearly recognized by the conventional reflection-type reading apparatus. In the present embodiment, by using the condenser lens 42 and the screen 44, the depth of field of the imaging unit 40 can be made shallow, and the influence of the reflected light of the image of the uneven portion 17 reflected on the inner surface of the container 10 can be reduced.
as shown in fig. 5, the concave-convex shape 17 formed on the lower edge portion 15 of the container 10 is clearly projected on the screen 44 via the condenser lens 42, which is not shown. In fig. 5, only a part of the concave-convex shape 17 is projected, but the entire concave-convex shape 17 is sequentially projected on the screen 44 because the container 10 is rotated.
The uneven shape 17 is a shape protruding from the outer surface 16 of the container 10, a shape recessed from the outer surface 16 toward the inside, or a combination of a protruding shape and a recessed shape. When the container 10 is a glass bottle, the irregularities engraved in the mold are transferred to the outer surface 16 of the container 10.
The uneven shape 17 formed on the outer surface 16 of the container 10 is a character protruding from the outer surface 16 of the container 10. The inspection unit 2 can prevent double reflection by projecting characters protruding from the outer surface 16 of the container 10 onto the screen 44, and can reliably recognize the characters by the processing unit 50 described later.
2-3. shooting part
As shown in fig. 2 and 3, the imaging unit 40 is disposed on an extension line connecting the container 10, the condenser lens 42, and the screen 44. The imaging unit 40 is fixed to the substrate 48. The imaging section 40 is arranged to image the uneven shape 17 of the outer surface 16 of the container 10 projected on the screen 44.
The imaging unit 40 is disposed at a position where an image projected on the screen 44 can be captured in front. In consideration of the installation space of the imaging section 40 and the ease of various adjustments, the condenser lens 42, the screen 44, and the imaging section 40 are arranged on an optical axis in which the optical axis of the light emitting section 20 shown by a one-dot chain line in fig. 2 is regularly reflected on the outer surface 16. The imaging unit 40 may be located at a position where an image projected on the screen 44 can be captured, and may not be located on the optical axis of the one-dot chain line in fig. 2.
As shown in fig. 3, the condenser lens 42, the screen 44, and the imaging unit 40 capture the light after the light of the light emitting unit 20 is regularly reflected by the lower edge portion 15 formed of a curved surface, and therefore the inspection unit 2 is inclined at an angle θ 2 according to the position of the uneven shape 17 in the lower edge portion 15. This is because the concave-convex shape 17 is generally on the curved surface of the lower edge portion 15. By tilting the inspection unit 2 at the angle θ 2, the light of the light emitting unit 20 can be reflected regularly at the lower edge portion 15 and reach the imaging unit 40 via the condenser lens 42 and the screen 44. The image captured by the imaging section 40 has the dark uneven shape 17 appearing on the screen 44 in a bright background. The angle θ 2 is an angle of the optical axes of the light emitting unit 20 and the imaging unit 40 with respect to a horizontal plane.
The imaging unit 40 can use a known line sensor camera, for example. Through the line sensor camera, the captured image has high resolution. The imaging unit 40 performs imaging in accordance with the rotation speed of the container 10 based on the output of the rotation detection unit 54, and thus does not affect the image 80 even if the rotation speed changes for some reason.
2-4. treatment section
the processing unit 50 receives image data obtained by the imaging unit 40 imaging the entire circumference (1.2 or more circumferences) of the trunk unit 13, and performs predetermined image processing on the image data. The processing unit 50 performs a predetermined inspection based on the image data after the image processing. The processing unit 50 is mounted as an additional component to the existing inspection apparatus 1, and is provided in a box separate from the control unit 61 of the inspection apparatus 1, but may be a part of the control unit 61.
first, an image 80 captured by the imaging unit 40 will be described with reference to fig. 6. Fig. 6 is a diagram illustrating characters in the captured image 80. In fig. 6, the concave-convex shape 17 includes a plurality of letters 18 and a logo 19. In fig. 6, an example shown as "123" is shown with respect to the text 18. The reference numeral 19 is 1 straight line extending in the horizontal direction and is disposed at the lowest position of the character 18. The identification symbol 19 is a so-called underline. The letters 18 and the identification symbols 19 are not limited to this example. The image 80 includes: a region serving as a bright background for the photographed character 18 and the identification symbol 19; and dark areas above and below the image 80 (shown in phantom). The area to be a bright background is a portion where light of the light emitting section 20 that is regularly reflected at the lower edge 15 is projected onto the screen 44. The dark region is a portion where light is not sufficiently reached to the screen 44 because the light is diffused upward and downward by the curved surface of the lower edge portion 15. The width in the height direction of the region that becomes a bright background can be adjusted by the diffusion angle of the diffusion plate 22 or the like.
the processing unit 50 first searches for the marker 19 (pattern matching) from the marker region 81 in the image 80 of fig. 6 in which only the marker 19 is present independently. Specifically, an image portion (the identification symbol 19) matching the comparison image data stored in advance in the storage unit (not shown) of the processing unit 50 is searched for. The marker 19 is an underline and does not exist at a height equal to or higher than a certain height of the image 80 like the other characters 18, and therefore, for example, the lower half of the image 80 is defined as the marker region 81.
When the processing unit 50 finds the marker 19 from the marker region 81, a predetermined region from a position horizontally distant from the marker 19 by a predetermined distance is set as an OCR (Optical Character Recognition/Reader) region 82. This is because the marker 19 and the character 18 are always in the same positional relationship.
the image 80 shown in fig. 6 is an image subjected to predetermined image processing by the processing unit 50. As the image processing, processing for making the contour of the uneven shape 17 conspicuous is performed. As such image processing, known gray-scale conversion processing can be performed. As the gray-scale conversion processing, for example, shading correction (shading correction) processing, processing for performing gray-scale conversion based on a difference from a reference image, a dynamic thresholding (dynamic binarization processing), or the like can be employed.
The processing unit 50 can perform a predetermined inspection on the image 80 after the image processing. The predetermined inspection is, for example, a process of reading characters 18 from the concave-convex shape 17. The letter 18 may be the type of the mold in which the container 10 is molded. The processing unit 50 outputs the result of the predetermined inspection to the control unit 61. The model number read from the inspection result of the processing unit 50 may be stored in an external storage unit, not shown, for example, and summarized as data for identifying the relationship between the model number and the quality of the container. If the relationship between the model number and the mass of the container is known, it is possible to adjust the molding conditions of the mold for molding the container 10 having poor quality, for example.
The processing unit 50 performs processing for extracting characters from the image-processed image 80. The process of extracting characters can be executed by, for example, extracting the shape of a black portion from the OCR area 82 of the image 80. The processing unit 50 performs pattern matching processing on the characters 18 in the OCR area 82 with characters registered in advance in a storage unit, not shown, of the processing unit 50. The pattern matching process is a so-called well-known OCR process. The processing unit 50 can store the result of determining that the characters 18 in the OCR area 82 match the registered characters in a storage unit, not shown, and can output the result to an external host information collection device via the control unit 61 of the inspection device 1, for example. When the character 18 is the model number of the mold, the model number of the container 10 inspected by the inspection unit 2 and the result of the inspection by another inspection apparatus are used as the characteristic (defect) information of each mold. Such characteristic information can be used, for example, by a higher-level information collection device in the production line of the container 10.
The processing unit 50 is not limited to character recognition, and for example, when the uneven shape 17 is a dot symbol, it is possible to recognize a combination of dots, compare the combination with a combination of dots registered in advance in the processing unit 50, and similarly store the determination result in a storage unit, not shown.
the processing unit 50 may execute not only the process of recognizing the symbol such as the character 18 but also other inspection items at the same time.
2-5. substrate
As shown in fig. 1 to 3, a substrate 48 is fixed to a chassis 70 of the inspection apparatus 1.
The imaging unit 40, the condenser lens 42, the screen 44, and the light emitting unit 20 are fixed to 1 substrate 48. With this configuration, the positions of the respective parts can be changed in a short time by changing the positions of the substrates 48 according to the type of the container 10 to be inspected.
The base plate 48 is fixed to the chassis 70 by a fixing portion 49. The fixing portion 49 is fixed to the chassis 70. The fixing portion 49 enables the substrate 48 to move in the Y direction (vertical direction) and the X direction (horizontal direction) with respect to the chassis 70, and enables the light emitting portion 20 and the like to be arranged and fixed at a predetermined position with respect to the container 10. The fixing portion 49 can dispose the substrate 48 at an arbitrary angle θ 2 with respect to the horizontal plane. The angle θ 2 can be adjusted according to the position of the uneven shape 17 on the container 10.
Therefore, even if the type of container 10 to be produced is changed and another container 10 is inspected by the inspection apparatus 1, the inspection unit 2 can be adjusted in a short time by adjusting the fixing portion 49 in accordance with the changed container 10 so that the Y-direction and X-direction positions of the substrate 48 are appropriate (positions where the uneven shape 17 is clearly projected onto the screen 44). In particular, it is not necessary to perform a complicated operation such as installing the light emitting unit 20 inside the conveyance path 72 when the container 10 is transparent as in the conventional case, and it is not necessary to change the inspection unit 2 according to the color of the container 10.
Further, by using the condenser lens 42 and the screen 44 in the inspection apparatus 1, there is no need to dispose a translucent screen in the vicinity (1mm to 3mm) of the container 10 as in the apparatus of patent document 1, and therefore, there is no need to readjust the apparatus without damaging the screen 44 due to the tilting and breaking of the container 10.
3. Inspection method for container
The inspection method of the container 10 according to the present embodiment is characterized in that the container 10 is rotated about the central axis 12, light is emitted from the light emitting part 20 toward the uneven portion 17 formed on the outer surface 16 of the container 10, the light reflected from the container 10 is projected onto the screen 44 by the condenser lens 42, and an image of the screen 44 is captured by the imaging part 40. According to this inspection method, the uneven shape 17 on the outer surface 16 of the container 10 can be reliably inspected using a reflection-type optical system.
A method of inspecting the container 10 will be described with reference to fig. 1 to 7. Fig. 7 is a flow chart of a method of inspecting the container 10.
S10: when the container 10 is arranged at the predetermined position, the processing unit 50 outputs a rotation start command to the rotation control unit 62 of the control unit 61. In response to the instruction for starting rotation, the motor 60 is driven to rotate the side roller 32 at a predetermined speed. Due to the rotation of the side rollers 32, the container 10 conveyed to the inspection station 74 starts to rotate about the central axis 12.
S20: the processing unit 50 issues an instruction to start imaging to the imaging unit 40. The imaging unit 40 obtains an imaging timing from a signal output from the rotation detecting unit 54 along with the rotation, and images the entire circumference (for example, 1.2 or more circles) of the lower edge portion 15, for example. At this time, the light from the light emitting unit 20 is diffused by the diffusion plate 22 and is irradiated to the uneven shape 17 formed on the outer surface 16 of the container 10. By using the diffused light, even if the uneven portion 17 is formed on the lower edge portion 15 of the curved surface, the reflected light can be used efficiently. The processing unit 50 stores the captured image 80 in a storage unit, not shown.
S30: the processing unit 50 performs an identifier number search on the captured image 80. The marker retrieval is to detect the location of the marker 19 in the image 80 by pattern matching.
S40: the processing unit 50 determines whether or not the predetermined identification symbol 19 can be recognized. When the predetermined identification symbol 19 can be recognized, S50 is executed. When the predetermined marker 19 is not recognized, "NG data" is output to the control unit 61 (S90). The "NG data" is, for example, programmed data that is output when the predetermined identification symbol 19 is not recognized. The container 10 to which the "NG data" is output is not recognized by the letters 18 (model number), and is therefore handled as a container 10 of unknown model number, for example.
S50: the processing section 50 performs OCR area creation processing on the image 80. The OCR area creating process creates a predetermined area as the OCR area 82 from a position horizontally distant from the marker symbol 19 by a predetermined distance.
S60: the processing unit 50 performs pattern matching processing on the image 80. Prior to the pattern matching process, a predetermined process is first performed on the image 80. For example, the processing unit 50 performs processing for making the outline of the uneven pattern 17 in the image 80 conspicuous (processing for blacking the characters 18), and stores the image 80 after the image processing in a storage unit (not shown). Next, the processing unit 50 performs processing for extracting a black-shaped portion (character 18) from the stored image 80. Then, the processing unit 50 performs pattern matching processing for matching the characters 18 in the OCR area 82 with characters for matching registered in advance in the processing unit 50. When the uneven shape 17 includes the characters 18, the characters 18 can be read from the image 80 captured by the imaging unit 40.
S70: the processing unit 50 determines whether or not the degree of correlation of the characters 18 read by the pattern matching process (S60) is higher than a preset threshold. The degree of correlation is a degree of coincidence between the characters for alignment registered in advance in the processing unit 50 and the characters 18 read by the pattern matching process. If the correlation is higher than a predetermined threshold, it indicates that the text 18 has been read correctly.
S80: the processing section 50 outputs the result of the pattern matching process (model information) to, for example, the control section 61. Further, the control unit 61 associates the model information with information of other inspection results and outputs the information to an upper information collection device, not shown. The upper information collection device collects the model information in association with information on a plurality of inspection results. The upper information collecting device is, for example, a device that collects information of the entire production line of the container 10.
The present invention is not limited to the above-described embodiments, and various modifications can be made. For example, the present invention includes substantially the same configurations as those described in the embodiments (for example, configurations having the same functions, methods, and results or configurations having the same objects and effects). The present invention includes a configuration in which the nonessential portions of the configurations described in the embodiments are replaced. The present invention includes a configuration that achieves the same operational effects or the same objects as those of the configuration described in the embodiment. The present invention includes a configuration in which a known technique is added to the configuration described in the embodiment.
Description of the reference numerals
1 … inspection device, 2 … inspection unit, 10 … container, 11 … mouth, 12 … central axis, 13 … trunk, 14 … bottom, 15 … lower edge, 16 … outer surface, 17 … concavo-convex shape, 18 … characters, 19 … identification symbol, 20 … light emitting part, 22 … diffuser plate, 24 … assembly track, 30 … rotation support part, 32 … side roller, 35 … belt, 40 … shooting part, 42 … condenser lens, 43 … lens fixing plate, 44 … screen, 45 … screen fixing plate, 48 … substrate, 49 … fixing part, 50 … processing part, 54 … rotation detection part, 60 … motor, 61 … control part, 62 … rotation control part, 70 … chassis, 72 … conveying path, 74 … inspection station, 75 … conveying central axis, 78 conveying port, 79 conveying port, … outlet, 3680 image, … identification area, … area, OCR …, θ 2 angle diffusion area, …, and θ 2 angle.
Claims (9)
1. an inspection apparatus for a container, comprising:
A light emitting unit that irradiates light onto a concave-convex shape formed on an outer surface of a container;
A rotation support part which supports the container rotating around the central axis of the container;
a condenser lens for projecting light reflected by the container out of the light emitted from the light emitting unit onto a screen; and
And an imaging unit that images the image projected onto the screen.
2. The inspection device for containers according to claim 1,
The concave-convex shape includes characters,
The image processing device further comprises a processing part for recognizing characters from the image shot by the shooting part.
3. The inspection device for containers according to claim 1 or 2,
A diffusion plate is further provided between the light emitting part and the container,
The diffusion plate diffuses light from the light emitting unit and irradiates the light to the container.
4. The inspection device for containers according to any one of claims 1 to 3,
the imaging unit, the condenser lens, the screen, and the light emitting unit are fixed to 1 substrate.
5. The inspection device for containers according to any one of claims 1 to 4,
The uneven shape formed on the outer surface of the container is a character protruding from the outer surface of the container.
6. a method of inspecting a container,
The container is rotated around the central axis of the container,
Light is emitted from the light emitting section toward the uneven shape formed on the outer surface of the container,
The reflected light from the container is projected by a condenser lens to a screen,
The image of the screen is photographed by a photographing part.
7. The inspection method of a container according to claim 6,
The concave-convex shape includes characters,
characters are recognized from the image captured by the image capturing unit.
8. The inspection method of a container according to claim 6 or 7,
The light emitted from the light emitting section is diffused by the diffusion plate and is irradiated to the uneven shape formed on the outer surface of the container.
9. the inspection method of a container according to claim 8,
The diffusion plate has a diffusion angle which is uniform to a predetermined angle as a whole,
The diffusion angle is 10-40 degrees.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2017/016616 WO2018198248A1 (en) | 2017-04-26 | 2017-04-26 | Inspection device for container and inspection method for container |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110546650A true CN110546650A (en) | 2019-12-06 |
| CN110546650B CN110546650B (en) | 2023-05-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780090027.6A Active CN110546650B (en) | 2017-04-26 | 2017-04-26 | Container inspection device and container inspection method |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP6893242B2 (en) |
| KR (1) | KR102300158B1 (en) |
| CN (1) | CN110546650B (en) |
| PH (1) | PH12019502222A1 (en) |
| WO (1) | WO2018198248A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113426705A (en) * | 2021-08-25 | 2021-09-24 | 江苏圣锦硅业新材料有限公司 | Glass bottle bottleneck crack check out test set |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7220128B2 (en) * | 2019-06-21 | 2023-02-09 | 東洋ガラス株式会社 | Glass bottle inspection method and glass bottle manufacturing method |
| WO2021089125A1 (en) * | 2019-11-05 | 2021-05-14 | Schunk Sonosystems Gmbh | Ultrasonic welding device with integrated camera assembly |
| CN110966956A (en) * | 2019-11-19 | 2020-04-07 | 北京伟景智能科技有限公司 | Binocular vision-based three-dimensional detection device and method |
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| JP3163535B2 (en) * | 1997-02-28 | 2001-05-08 | 滋賀県 | Transparent uneven mark reading device |
| JP4444273B2 (en) * | 2006-12-26 | 2010-03-31 | 東洋ガラス株式会社 | Transparency or translucent article embossed character reading method and apparatus |
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2017
- 2017-04-26 WO PCT/JP2017/016616 patent/WO2018198248A1/en active Application Filing
- 2017-04-26 KR KR1020197032555A patent/KR102300158B1/en active IP Right Grant
- 2017-04-26 JP JP2019514967A patent/JP6893242B2/en active Active
- 2017-04-26 CN CN201780090027.6A patent/CN110546650B/en active Active
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| JPS55104744A (en) * | 1979-02-06 | 1980-08-11 | Shimadzu Corp | Device for inspecting glass bottle |
| CN1158049A (en) * | 1995-10-30 | 1997-08-27 | 索尼公司 | Projection-type display device |
| CN1932635A (en) * | 2005-09-12 | 2007-03-21 | 卡西欧计算机株式会社 | Projecting apparatus and method and recording medium recording the projecting method |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2018198248A1 (en) | 2018-11-01 |
| PH12019502222A1 (en) | 2020-07-06 |
| KR102300158B1 (en) | 2021-09-10 |
| JP6893242B2 (en) | 2021-06-23 |
| JPWO2018198248A1 (en) | 2020-03-05 |
| KR20190134732A (en) | 2019-12-04 |
| CN110546650B (en) | 2023-05-19 |
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