CN110546650B - Container inspection device and container inspection method - Google Patents
Container inspection device and container inspection method Download PDFInfo
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- CN110546650B CN110546650B CN201780090027.6A CN201780090027A CN110546650B CN 110546650 B CN110546650 B CN 110546650B CN 201780090027 A CN201780090027 A CN 201780090027A CN 110546650 B CN110546650 B CN 110546650B
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- container
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- convex shape
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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
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
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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
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 unit (30) for supporting the container (10) that rotates about the central axis (12); a condensing lens (42) which projects light reflected by the container (10) out of the light-emitting unit (20) onto a screen (44); and an imaging unit (40) that images an image projected onto the screen (44). The concave-convex shape (17) can contain characters, and the inspection device (1) can contain a processing unit (50) for recognizing characters from the image (80) captured by the capturing unit (40).
Description
Technical Field
The present invention relates to a container inspection apparatus and a container inspection method.
Background
A model reading device is known which reads characters or symbols formed by concave-convex shapes formed on the outer surface of a container, particularly a glass bottle (non-patent document 1). The concave-convex shape refers to a shape protruding from the outer surface of the glass bottle, a shape recessed from the outer surface toward the inside, or a shape composed of a combination of the protruding shape and the recessed shape. A general type reading device for a glass bottle optically reads a type (a type) formed as a concave-convex shape at a bottom or a lower edge portion 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 respective bottles are automatically collected for each mold corresponding to the read characters, so that it is known which defect has occurred in the bottle molded by which mold. As a result, for example, data obtained by integrating the quality of the bottles for each mold can be fed back to an operator of the molding machine, or only bottles manufactured in a specific model can be removed from the production line.
As disclosed in non-patent document 1, the configuration of the optical system of the model reading device is generally classified according to whether light received by the light receiver is reflected light or transmitted light. The reflection type is a method in which light from a light projector reflected from a glass bottle is read by a light receiver. The transmission type is a method in which light transmitted through a light projector of a glass bottle is read by a light receiver.
An inspection device proposed by the applicant of the present application is a representative example of a transmission type character reading device (patent document 1). The transmissive character reading device is an epoch-making device that solves the difficulty in reading characters on a transparent (or translucent) glass bottle. In the transmissive character reading device, the embossed characters are projected onto the screen by using the lenticular effect of the embossed characters, thereby facilitating the recognition of the model.
According to the invention of patent document 1, misidentification of a model number on a transparent (or translucent) glass bottle can be reduced, but it is necessary to secure a space for disposing an illumination body on the rear side of the glass bottle.
In recent years, a reflective type character reading apparatus (container inspection system) has also been proposed (patent document 2). However, this character reading apparatus does not disclose a specific solution of how to make clear the outline of the concave-convex shape on the transparent (or semitransparent) glass bottle using the reflected light. Further, it was found that in the reflective type character reading apparatus, double reflection shadows of characters (concave-convex shapes) occur with respect to the transparent glass bottle. Such double-reflected shadows are photographed at a gradation close to that of the text, and thus cause a reading error or misreading. Moreover, a read error or the like affects the processing in the subsequent stage.
Prior art literature
Patent literature
Patent document 1: JP-A2008-158943
Patent document 2: international publication No. 2014-50641
Non-patent literature
Non-patent document 1: "Coccus corporation of Undaria, a technology of Undaria, 5 th web (field technology of glass manufacturing, 5 th volume)", published by the society of Japan glass products industry, 6 th month, 3 rd day of 1993, p.241-265
Disclosure of Invention
Problems to be solved by the invention
The present invention provides a container inspection device and a container inspection method capable of inspecting the concave-convex shape of the outer surface of a container.
Solution for solving the problem
The present invention has been made to solve at least some 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 this application example is characterized by comprising:
a light emitting unit that irradiates light onto the concave-convex shape formed on the outer surface of the container;
a rotation support unit for supporting a container that rotates about a central axis of the container;
a condensing lens for projecting light reflected by the container out of the light emitting unit onto a screen; and
and an imaging unit that images an image projected on the screen.
According to this application example, the concave-convex shape 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 this application example, the inspection apparatus may be,
the concave-convex shape comprises characters and the like,
the image processing device further includes a processing unit for recognizing characters from the image captured by the capturing unit.
According to this application example, characters on the outer surface of the container can be reliably recognized using the reflective optical system.
Application example 3
In the inspection apparatus for a container according to this application example, the inspection apparatus may be,
a diffusion plate is also included between the light-emitting part and the container,
the diffusion plate diffuses light from the light emitting unit to irradiate the container.
According to this 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 this application example, the inspection apparatus may be,
the imaging unit, the condenser lens, the screen, and the light emitting unit are fixed to 1 substrate.
According to this application example, the positions of the substrates can be changed according to the types of the containers to be inspected, so that the respective parts can be arranged at appropriate positions in a short time.
Application example 5
In the inspection apparatus for a container according to this application example, the inspection apparatus may be,
the concave-convex shape formed on the outer surface of the container is a letter protruding from the outer surface of the container.
According to this application example, the characters protruding from the outer surface of the container can be reliably read.
Application example 6
The method for inspecting a container according to the present application example is characterized in that,
the container is rotated about the central axis of the container,
light is emitted from the light emitting portion toward the concave-convex shape formed on the outer surface of the container,
reflected light from the container is projected to the screen by the condenser lens,
the image of the screen is captured by a capturing unit.
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 this application example, the inspection apparatus may be,
the concave-convex shape comprises characters and the like,
characters are recognized from the image captured by the imaging unit.
According to this application example, characters on the outer surface of the container can be reliably recognized using the reflective optical system.
Application example 8
In the inspection apparatus for a container according to this application example, the inspection apparatus may be,
the light of the light emitting portion is diffused by a diffusion plate to be irradiated on the concave-convex shape formed on the outer surface of the container.
According to this 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 this application example, the inspection apparatus may be,
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, by making the diffusion angle in the diffusion plate uniform as a whole, the shadow of the concave-convex shape projected on the screen can be made clear. In addition, according to the present application example, by making the diffusion angle in 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 on the periphery of the concave-convex 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 capable of inspecting the concave-convex 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 section, the photographing section, 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 portion and the diffusion plate.
Fig. 5 is a front view illustrating a lower edge portion of a container and a screen.
Fig. 6 is a diagram illustrating characters in a photographed 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 invention set forth in the claims. All the components described below are not necessarily essential components of the present invention.
The inspection apparatus for a container according to the present embodiment is characterized by comprising: a light emitting unit that irradiates light onto the concave-convex shape formed on the outer surface of the container; a rotation support unit for supporting a container that rotates about a central axis of the container; a condensing lens for projecting light reflected by the container out of the light emitting unit onto a screen; and an imaging unit that images an image projected on the screen.
1. Outline of inspection apparatus for Container
An outline of an inspection apparatus 1 for a 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 conveyance port 78, a conveyance path 72, a conveyance outlet 79, and an inspection unit 2, which are disposed on the chassis 70. The inspection apparatus 1 further includes a control unit 61 that controls the entire apparatus.
The conveyance path 72 is formed in a circumferential shape centering on the conveyance center axis 75. The container 10 is conveyed on the conveyance path 72 clockwise in fig. 1.
The container 10 is intermittently carried into the carrying path 72 from the carrying port 78 of the inspection apparatus 1. The conveyance path 72 is provided with rotation support portions 30 (only 1 is shown in fig. 1) for supporting the containers 10 one by one. The container 10 is intermittently transported to each table on the transport path 72 in a state 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 efficiently inspected sequentially in the middle of conveyance of the containers 10. On the conveyance path 72, an 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 central 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 linear shape.
The container 10 is a glass bottle. As the container 10, any material that reflects light may be used. As for the glass bottle, not only a conventional colored glass bottle advantageous for a reflection type optical system, but also a colorless transparent (Flint) glass bottle can be used as an inspection object.
1-1 rotation support
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 portion 30 supports the container 10 that rotates around the center axis 12. The rotation support portion 30 rotates together with the container 10 while supporting the bottom 14 of the container 10. The central axis 12 is a virtual 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 to be rotated.
The rotation support portion 30 is a member for conveying the container 10 to a predetermined position for inspection shown in fig. 2 and 3 in a state where the container 10 is supported. Accordingly, the containers 10 are intermittently transported in order from the rotation support portion 30 to a predetermined position to be inspected, and after being placed at the predetermined position, the containers 10 are rotated about the central axis 12 by the rotation of the side rollers 32. Instead of carrying the containers 10 by the rotary support 30, for example, the containers 10 may be intermittently carried to the inspection station 74 in sequence by using a star wheel provided in the carrying path 72. In this case, the rotation support portion 30 is disposed at each inspection station 74.
As shown in fig. 3, the side roller 32 transmits 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 unit 62 of the control unit 61, and rotates the container 10. When the container 10 is conveyed to the inspection position, the side roller 32 rotates at a predetermined speed by a predetermined amount in accordance with the instruction of the rotation control unit 62. The rotation of the prescribed amount is an amount sufficient to photograph the entire circumference of the container 10. In order to grasp the entire circumference of the sample with 1 image data, a predetermined amount of rotation is set to, for example, 1.2 or more turns. 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 portion 54 may be a rotary encoder directly or indirectly mounted to the motor 60.
The control unit 61 and the processing unit 50 described below are not shown, but 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 is 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 light onto the concave-convex shape 17 formed on the outer surface 16 of the container 10; a rotation support unit 30 for supporting the container 10 to rotate around the central axis 12; a condenser lens 42 that projects light reflected by the container 10, out of the light emitting section 20, onto a screen 44; and an imaging unit 40 that images an image projected on a screen 44. The inspection unit 2 can reliably inspect the concave-convex shape 17 of the outer surface 16 of the colored container and the colorless transparent container 10 using the reflective 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 assembled together with the processing unit 50 as an additional component to the existing inspection apparatus 1.
The inspection unit 2 can take an image of the concave-convex shape 17 formed on the outer surface 16 of the container 10, and execute a predetermined inspection based on the image taken. The predetermined inspection includes, for example, identifying the model of the mold that formed the container 10 from the concave-convex shape 17. Further, as a predetermined inspection, for example, a defect on the outer surface 16 of the container 10 may be inspected.
The concave-convex shape 17 is, for example, a symbol including an arabic numeral, a letter, a dot, and the like. The symbols used for the glass bottles include a symbol indicating a manufacturing plant designated by each glass bottle manufacturer, a mold number, and the like. For example, a combination of arabic numerals and letters is sometimes used as a symbol in japan, and dots and the like are sometimes used as symbols in japan.
When the concave-convex shape 17 is a character, the processing unit 50 recognizes the character from the image captured by the capturing unit 40. The inspection unit 2 can reliably recognize the letters of the outer surface 16 of the container 10 using a reflective optical system.
Next, details of each section of the inspection unit 2 will be described.
2-1. Light emitting portion
The light emitting unit 20 will be described with reference to fig. 2 to 4. Fig. 4 is a plan view illustrating a relationship between the light emitting unit 20 and the diffusion plate 22.
As shown in fig. 2 and 3, the light emitting unit 20 is fixed to the substrate 48, and irradiates the concave-convex shape 17 formed on the outer surface 16 of the container 10 with light.
The light emitting portion 20 is a light source for illuminating the container 10. For example, a point light source illuminator can be used as the light emitting unit 20. The point light source illumination body includes a light source such as an LED (Light Emitting Diode: light emitting diode) and a condensing 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 capable of emitting parallel light. The light emitting unit 20 is not limited to a point light source illuminator, and other known illuminators may be used as long as the reflected light from the container 10 has brightness enough to perform photographing.
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 light from the light emitting unit 20 to irradiate the container 10. 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 uneven brightness of light from the light emitting unit 20, and diffuses parallel light from the light emitting unit 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 prescribed range in a state where the brightness unevenness is eliminated. By using the diffusion plate 22, even if the concave-convex shape 17 is formed in a curved surface portion of the container 10, the reflected light can be efficiently utilized. The light emitting unit 20 may be integrated with the diffusion plate 22 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 concave-convex shape 17 imaged by the imaging unit 40 described later. For example, in the case where a point light source illuminator having a circular irradiation 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 concave-convex shape 17 is illuminated.
As shown in fig. 3, the concave-convex shape 17 is generally formed in the lower edge portion 15 of the container 10. This is because the cylindrical trunk 13 is generally used as a label surface for displaying contents. Since the concave-convex shape 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 strong or weak when only the parallel light is irradiated. When the concave-convex shape 17 is provided on the lower edge portion 15, a relatively uniform reflected light can be obtained by using the diffusion plate 22.
The diffusion plate 22 preferably has a diffusion angle that is uniform to a predetermined angle as a whole. By making the diffusion angle in the diffusion plate 22 uniform as a whole, shadows of characters and the like projected on the screen 44 can be made clear. In addition, by making the diffusion angle in 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, as for a bright background, the following fig. 6 will be used. As a result of experiments for recognizing the image of the concave-convex shape 17 in the imaging section 40, it was found that the diffusion angle of the diffusion plate 22 is preferably 10 ° to 40 °. In fig. 4, the diffusion angle of the diffusion plate 22 is indicated by θ1. The diffusion angle is an expansion angle of light transmitted through the diffusion plate with respect to incident light from the light emitting portion 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 emitting portion 20, onto the screen 44. The condenser lens 42 is disposed at a position capable of receiving light, which is regularly reflected on the outer surface 16 (the region including the concave-convex shape 17) of the container 10, of the light emitting unit 20.
The condensing lens 42 includes a plurality of lenses, and condenses light reflected by the container 10. The condenser lens 42 is disposed on the substrate 48 such that the image of the concave-convex 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. 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 of the condenser lens 42 is projected onto the screen 44, and the screen 44 can reflect the image of the concave-convex shape 17. The screen 44 can be a so-called transmissive screen having a diffusion layer.
The screen 44 is fixed to a screen fixing plate 45 fixed at its lower end to a base plate 48, and is fixed so as to block through holes provided in the screen fixing plate 45.
By projecting the image of the concave-convex shape 17 onto the screen 44 by the condenser lens 42, the depth of field of the imaging unit 40 can be made shallow, and double reflection of the concave-convex shape 17 can be prevented even if the container 10 is a transparent glass bottle. The double reflection means that, when a transparent glass bottle is photographed in a conventional reflection type optical system, not only the reflected light of the concave-convex shape 17 but also the reflected light of the image of the concave-convex shape 17 reflected on the inner surface of the container 10 is photographed by a camera, and thus a double image of the concave-convex shape 17 is photographed. Therefore, with the conventional reflection type reading apparatus, the original outline of the concave-convex shape 17 cannot be clearly recognized. In the present embodiment, the depth of field of the imaging unit 40 can be made shallow by using the condenser lens 42 and the screen 44, and the influence of the reflected light of the image of the concave-convex shape 17 projected 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 15 of the container 10 is clearly projected on the screen 44 through a condensing lens 42, not shown. In fig. 5, only a part of the concave-convex shape 17 is projected, but the container 10 rotates, so that the entire concave-convex shape 17 is sequentially projected on the screen 44.
The concave-convex shape 17 is a shape protruding from the outer surface 16 of the container 10, a shape recessed inward from the outer surface 16, or a shape composed of a combination of the protruding shape and the recessed shape. In the case where the container 10 is a glass bottle, the irregularities engraved into the mold are transferred to the outer surface 16 of the container 10.
The concave-convex shape 17 formed on the outer surface 16 of the container 10 is a letter protruding from the outer surface 16 of the container 10. The inspection unit 2 can prevent double mapping by projecting characters protruding from the outer surface 16 of the container 10 onto the screen 44, and can reliably perform recognition 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 a substrate 48. The photographing section 40 is configured to photograph the concave-convex shape 17 projected to the outer surface 16 of the container 10 of the screen 44.
The imaging unit 40 is disposed at a position where an image projected on the screen 44 can be front-imaged. In view of the installation space of the photographing section 40 and the ease of various adjustments, the condenser lens 42, the screen 44, and the photographing 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 regular 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 imaged, and may not be located on the optical axis of the one-dot chain line in fig. 2.
As shown in fig. 3, since the condenser lens 42, the screen 44, and the imaging unit 40 are configured to capture light of the light emitting unit 20, which is regularly reflected by the lower edge 15 formed by a curved surface, the inspection unit 2 is inclined at an angle θ2 in accordance with the position of the concave-convex shape 17 in the lower edge 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 θ2, the light of the light emitting section 20 is orthographically reflected at the lower edge section 15 to reach the photographing section 40 via the condenser lens 42 and the screen 44. The image captured by the capturing section 40 has a dark concave-convex shape 17 on the screen 44 appearing in a bright background. The angle θ2 is an angle of the optical axes of the light emitting unit 20 and the imaging unit 40 with respect to the horizontal plane.
For example, a known line sensor camera can be used as the imaging unit 40. The photographed image has a high resolution by the line sensor camera. 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 is changed for some reason.
2-4 treatment part
The processing unit 50 receives image data captured by the imaging unit 40 over the entire circumference (1.2 weeks or more) of the main 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 to the existing inspection apparatus 1 as an additional configuration, and is therefore provided in a case 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 capturing 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 characters 18 and a logo 19. In fig. 6, an example of the letter 18 is shown as "123". The reference numeral 19 is 1 straight line extending in the horizontal direction, and is disposed at the lowest position of the letter 18. The identification symbol 19 is a so-called underline. The letter 18 and the identification symbol 19 are not limited to this example. The image 80 includes: a region that serves as a bright background for photographing the text 18 and the mark 19; and dark areas (shown in phantom) above and below the image 80. The area that becomes a bright background is a portion where the light of the light emitting portion 20 that is regular-reflected at the lower edge portion 15 is projected onto the screen 44. The dark area is a portion where light is not sufficiently reached to the screen 44 because light is diffused upward and downward due to the curved surface of the lower edge portion 15. The width of the area to be a bright background in the height direction can be adjusted by the diffusion angle of the diffusion plate 22 or the like.
The processing unit 50 first searches (pattern matches) the identification symbol 19 from among the identification areas 81 of the image 80 of fig. 6 where only the identification symbol 19 exists independently. Specifically, an image portion (reference numeral 19) matching the image data for alignment stored in advance in a storage unit (not shown) of the processing unit 50 is searched for. Since the mark 19 is underlined and does not exist at a height equal to or higher than a predetermined height of the image 80 like the other characters 18, the lower half of the image 80 is, for example, the mark area 81.
When the processing unit 50 finds the identification symbol 19 from among the identification regions 81, the predetermined region from the position at a predetermined distance from the identification symbol 19 in the horizontal direction is set as an OCR (Optical Character Recognition/Reader: optical character recognition/reading) region 82. This is because the identification symbol 19 and the letter 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 highlighting the outline of the concave-convex shape 17 is performed. As such image processing, a well-known gradation conversion processing can be performed. As the gradation conversion processing, for example, shading correction (shading correction) processing, processing for performing gradation conversion based on a difference from a reference image, a dynamic thresholding method (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 the text 18 from the concave-convex shape 17. The letter 18 can be a model of a mold that is used to shape the container 10. The processing unit 50 outputs the result of the predetermined inspection to the control unit 61. The model 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 indicating the relationship between the model and the quality of the container. If the relation between the model and the quality of the container is known, for example, the molding conditions of the mold for molding the container 10 having a poor quality can be adjusted.
The processing unit 50 performs a process of extracting text from the image 80 after the image processing. The process of extracting text can be performed by extracting the shape of the black portion from among the OCR area 82 of the image 80, for example. The processing unit 50 performs a pattern matching process with respect to the character 18 in the OCR area 82 with respect to characters registered in a storage unit, not shown, of the processing unit 50 in advance. The pattern matching process is a so-called well-known OCR process. The processing unit 50 can store the result of the determination that the character 18 in the OCR area 82 matches the registered character in a storage unit not shown, and can output the result to an external upper-level information collection device via the control unit 61 of the inspection device 1, for example. When the character 18 is a mold type, the type of the container 10 inspected by the inspection unit 2 and the result of the inspection by the other inspection device are used as characteristic (defect) information for each mold. Such use of the characteristic information can be performed by, for example, an upper-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 concave-convex 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 the processing unit 50 in advance, and store the result of determination in a storage unit not shown.
The processing unit 50 may perform not only the process of recognizing the symbol such as the character 18 but also other inspection items.
2-5. Substrate
As shown in fig. 1 to 3, the substrate 48 is fixed to the 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 respective parts can be arranged at appropriate positions in a short time by changing the position of the substrate 48 according to the type of the container 10 to be inspected.
The base plate 48 is fixed to the chassis 70 by the fixing portion 49. The fixing portion 49 is fixed to the chassis 70. The fixing portion 49 can move the substrate 48 in the Y direction (vertical direction) and the X direction (horizontal direction) with respect to the chassis 70, and can dispose and fix the light emitting portion 20 and the like at a predetermined position with respect to the container 10. The fixing portion 49 can be disposed so that the substrate 48 is inclined at an arbitrary angle θ2 with respect to the horizontal plane. The angle θ2 can be adjusted according to the position of the concave-convex shape 17 on the container 10.
Therefore, even if the type of the container 10 to be produced is changed, the inspection device 1 inspects another container 10, and the fixing portion 49 is adjusted 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 concave-convex shape 17 is clearly projected on the screen 44), thereby adjusting the inspection unit 2 in a short time. In particular, in the case of the transparent container 10 as in the prior art, the complicated work such as providing the light emitting portion 20 inside the conveyance path 72 is not required, and the inspection unit 2 does not need to be changed according to the color of the container 10.
In addition, by using the condenser lens 42 and the screen 44 in the inspection apparatus 1, there is no need to dispose a translucent screen near the container 10 (1 mm to 3 mm) as in the apparatus of patent document 1, and therefore, the screen 44 is not broken due to tilting/crushing of the container 10, and there is no need to readjust the apparatus.
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 unit 20 toward the concave-convex shape 17 formed on the outer surface 16 of the container 10, and reflected light 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 unit 40. According to this inspection method, the concave-convex shape 17 of the outer surface 16 of the container 10 can be reliably inspected using a reflection type optical system.
The inspection method of 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 placed at the predetermined position, the processing unit 50 outputs a rotation start instruction to the rotation control unit 62 of the control unit 61. In response to a command to start 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 center axis 12.
S20: the processing unit 50 issues an instruction to start shooting to the shooting unit 40. The imaging unit 40 obtains imaging timing from a signal output from the rotation detection unit 54 in response to rotation, and for example, images the entire circumference (for example, 1.2 weeks or more) of the lower edge 15. At this time, the light of the light emitting portion 20 is diffused by the diffusion plate 22 and irradiated to the concave-convex shape 17 formed on the outer surface 16 of the container 10. By using the diffused light, even if the concave-convex shape 17 is formed on the curved lower edge portion 15, the reflected light can be efficiently utilized. The processing unit 50 stores the captured image 80 in a storage unit not shown.
S30: the processing unit 50 performs identification symbol search on the captured image 80. The identification symbol retrieval is to detect the position of the identification symbol 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 identification symbol 19 cannot be recognized, the "NG data" is output to the control unit 61 (S90). The "NG data" is, for example, programmed data which is output when the predetermined identification symbol 19 is not recognized. The container 10 to which the "NG data" is output is treated as, for example, an unidentified container 10 because the text 18 (model) is not recognized.
S50: the processing section 50 performs OCR region creation processing on the image 80. The OCR area creation process creates a predetermined area from a position at a predetermined distance in the horizontal direction from the identification symbol 19 as the OCR area 82.
S60: the processing unit 50 performs pattern matching processing on the image 80. Before the pattern matching process, a predetermined process is first performed on the image 80. For example, the processing unit 50 performs a process for highlighting the outline of the concave-convex shape 17 in the image 80 (a process for blackening the character 18), and stores the image 80 after the image process in a storage unit not shown. Next, the processing unit 50 performs processing of extracting a black-shaped portion (text 18) from the stored image 80. Then, the processing unit 50 performs a pattern matching process of comparing the character 18 in the OCR area 82 with the characters for comparison registered in the processing unit 50 in advance. When the concave-convex shape 17 includes the character 18, the character 18 can be read from the image 80 captured by the capturing unit 40.
S70: the processing unit 50 determines whether or not the degree of correlation of the text 18 read by the pattern matching process (S60) is higher than a predetermined threshold. The correlation degree is a degree of coincidence between the character for comparison registered in the processing unit 50 in advance and the character 18 read by the pattern matching process. If the correlation is higher than the preset threshold, it is indicated that the text 18 is correctly read.
S80: the processing section 50 outputs the result (model information) of the pattern matching process to, for example, the control section 61. Further, the control unit 61 associates the model information with information of other inspection results, and then outputs the result to an unillustrated upper-level information collection device. The upper level information collection device collects model information in association with information of a plurality of inspection results. The upper level information collection device is, for example, a device that collects information on 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 constitution as that described in the embodiment (for example, constitution having the same function, method and result or constitution having the same purpose and effect). The present invention includes a configuration in which an unnecessary part of the configurations described in the embodiments is replaced. The present invention includes a configuration that has the same operational effects as the configuration described in the embodiment or a configuration that can achieve the same object. 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 apparatus, 2 … inspection unit, 10 … container, 11 … mouth, 12 … center shaft, 13 … trunk, 14 … bottom, 15 … lower edge portion, 16 … outer surface, 17 … concave-convex shape, 18 … letter, 19 … mark symbol, 20 … light emitting portion, 22 … diffusion plate, 24 … fitting rail, 30 … rotation support portion, 32 … side roller, 35 … band, 40 … photographing portion, 42 … condensing lens, 43 … lens fixing plate, 44 … screen, 45 … screen fixing plate, 48 … base plate, 49 … fixing portion, 50 … processing portion, 54 … rotation detection portion, 60 … motor, 61 … control portion, 62 … rotation control portion, 70 … chassis, 72 … conveying path, 74 … inspection station, 75 … conveying center shaft, 78 conveying inlet, 79 … outlet, 80 … image, 81 … mark region, 82 … diffusing angle, and 2 theta.
Claims (9)
1. An inspection apparatus for a container, comprising:
a light emitting unit that irradiates light onto the concave-convex shape formed on the outer surface of the container;
a rotation support unit for supporting a container that rotates about a central axis of the container;
a condensing lens that projects light reflected by the container out of the light emitting unit onto a screen so as not to double-reflect an image of the concave-convex shape;
an imaging unit that images an uneven image projected on the screen; and
and a processing unit that recognizes a symbol of the concave-convex shape from the image captured by the imaging unit.
2. The inspection apparatus for a container according to claim 1, wherein,
the concave-convex shape comprises characters and the like,
the processing unit recognizes a character from the image captured by the capturing unit.
3. Inspection device for containers according to claim 1 or 2, characterized in that,
a diffusion plate is also included between the light-emitting part and the container,
the diffusion plate diffuses light from the light emitting unit to irradiate the container.
4. Inspection device for containers according to claim 1 or 2, characterized in that,
the imaging unit, the condenser lens, the screen, and the light emitting unit are fixed to 1 substrate.
5. Inspection device for containers according to claim 1 or 2, characterized in that,
the concave-convex shape formed on the outer surface of the container is a letter protruding from the outer surface of the container.
6. A method for inspecting a container, characterized in that,
the container is rotated about the central axis of the container,
light is emitted from the light emitting portion toward the concave-convex shape formed on the outer surface of the container,
the reflected light from the container is projected onto the screen by the condenser lens so as not to double-reflect the image of the concave-convex shape,
an image of the concave-convex shape projected on the screen is shot by a shooting part,
the symbol of the concave-convex shape is recognized from the image captured by the imaging unit.
7. The method for inspecting a container according to claim 6, wherein,
the concave-convex shape includes a character.
8. A method for inspecting a container according to claim 6 or 7,
the light of the light emitting portion is diffused by a diffusion plate to be irradiated on the concave-convex shape formed on the outer surface of the container.
9. The method for inspecting a container according to claim 8, wherein,
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 CN110546650A (en) | 2019-12-06 |
| CN110546650B true CN110546650B (en) | 2023-05-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201780090027.6A Active CN110546650B (en) | 2017-04-26 | 2017-04-26 | Container inspection device and container inspection method |
Country Status (5)
| Country | Link |
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| JP (1) | JP6893242B2 (en) |
| KR (1) | KR102300158B1 (en) |
| CN (1) | CN110546650B (en) |
| PH (1) | PH12019502222A1 (en) |
| WO (1) | WO2018198248A1 (en) |
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|---|---|---|---|---|
| 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 |
| LT4054788T (en) * | 2019-11-05 | 2024-03-12 | Schunk Sonosystems Gmbh | Ultrasonic welding device with integrated camera arrangement |
| 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 |
| 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 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1158049A (en) * | 1995-10-30 | 1997-08-27 | 索尼公司 | Projection-type display device |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55104744A (en) * | 1979-02-06 | 1980-08-11 | Shimadzu Corp | Device for inspecting glass bottle |
| JP3163535B2 (en) * | 1997-02-28 | 2001-05-08 | 滋賀県 | Transparent uneven mark reading device |
| JP2007078821A (en) * | 2005-09-12 | 2007-03-29 | Casio Comput Co Ltd | Projector, projecting method and program |
| 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 |
| DE102009020920A1 (en) * | 2009-05-12 | 2010-11-18 | Krones Ag | Inspection device for detecting embossing and / or labels on transparent containers, in particular beverage bottles |
| JP5421763B2 (en) * | 2009-12-24 | 2014-02-19 | ヤマハ発動機株式会社 | Inspection apparatus and inspection method |
| JP5833413B2 (en) * | 2011-11-18 | 2015-12-16 | 株式会社エヌテック | Container inspection equipment |
| EP2892008A4 (en) * | 2012-09-28 | 2016-07-27 | Nihon Yamamura Glass Co Ltd | Text character read-in device and container inspection system using text character read-in device |
| FR2997181B1 (en) * | 2012-10-18 | 2014-12-12 | Msc & Sgcc | INSTALLATION FOR MEASURING THE THICKNESS OF THE WALL OF CONTAINERS |
-
2017
- 2017-04-26 JP JP2019514967A patent/JP6893242B2/en active Active
- 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 CN CN201780090027.6A patent/CN110546650B/en active Active
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2019
- 2019-09-25 PH PH12019502222A patent/PH12019502222A1/en unknown
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1158049A (en) * | 1995-10-30 | 1997-08-27 | 索尼公司 | Projection-type display device |
Also Published As
| Publication number | Publication date |
|---|---|
| PH12019502222A1 (en) | 2020-07-06 |
| JPWO2018198248A1 (en) | 2020-03-05 |
| KR20190134732A (en) | 2019-12-04 |
| JP6893242B2 (en) | 2021-06-23 |
| KR102300158B1 (en) | 2021-09-10 |
| WO2018198248A1 (en) | 2018-11-01 |
| CN110546650A (en) | 2019-12-06 |
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