JP2017072382A - Inspection reference light generator, inspection reference light generation method, inspection apparatus, inspection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inspection reference light generator, an inspection reference light generation method, an inspection apparatus, and an inspection method capable of improving inspection accuracy.SOLUTION: A light source 1 is disposed at one side in an axial direction of a cylindrical inspection object 4. The light source 1 has a light projecting plane which includes an illumination part 6 for emitting a beam of light to the inspection object 4 and a belt-like dark part 7 with brightness lower than that in illumination part 6. A camera 2 is disposed at the other side in the axial direction of the inspection object 4 to pick up an image of a reflected dark area 9 on the surface of the inspection object 4 in which the dark part 7 is reflected. A setting unit 10, 11 sets the shape of the dark part 7 so that the shape of the reflected dark area 9 has a predetermined shape.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an inspection reference light generation device, an inspection reference light generation method, an inspection device, and an inspection method that generate inspection reference light used in an appearance inspection for a cylindrical inspection object.

  2. Description of the Related Art Conventionally, in the appearance inspection of an article, a technique for detecting unevenness on the surface of the article using a scene phenomenon is known. A scene phenomenon is a phenomenon of light reflection on the surface of an article. When the angle between the incident light and the reflecting surface is a small angle (when the incident angle is close to a right angle), the specular reflection tendency increases and diffuse reflection This phenomenon is suppressed. When the surface of the article is smooth and has no irregularities, the incident light is easily totally reflected on the surface of the article regardless of the presence or absence of surface coating or a pattern, and the distribution of reflected light becomes uniform. On the other hand, when the surface of the article has irregularities (scratches, dents, etc.), the reflection direction of the total reflection component from the irregularities changes according to the irregularity shape, so the distribution of reflected light becomes uneven. Therefore, it is possible to detect irregularities on the surface of the article by grasping the intensity distribution of the reflected light (see Patent Documents 1 and 2).

JP-A-8-5573 JP-A-6-2141758

  However, when the unevenness of the uneven shape present on the surface of the article is small, the intensity change of the reflected light at that portion becomes small, and the unevenness may not be detected accurately. Also, in the inspection method using the scene phenomenon, since the intensity of the regular reflection light around the uneven portion is high, the change in the reflected light intensity of the uneven portion is easily erased, and the uneven portion may not be detected accurately.

  One of the purposes of the present invention was created in view of the above-described problems, and provides an inspection reference light generation device, an inspection reference light generation method, an inspection device, and an inspection method that improve inspection accuracy. is there. Further, the present invention is not limited to this purpose, and is an operational effect derived from each configuration shown in “Mode for Carrying Out the Invention” to be described later. It can be positioned as a purpose.

The disclosed inspection reference light generation device includes a light source and a camera arranged on one side in the axial direction of a cylindrical inspection object. The light source has a light projecting surface in which an illumination unit that irradiates light to the inspection object and a belt-like dark part that is lighter than the illumination unit are formed. The camera photographs a reflection dark part formed by reflecting the dark part on the surface of the inspection object from the other side in the axial direction of the inspection object. In addition, the disclosed inspection reference light generation device includes a setting unit that sets the shape of the dark part such that the shape of the reflection dark part is a predetermined shape.
The disclosed inspection apparatus includes the light source, the camera, and an acquisition unit that acquires information on the shape of the dark part where the shape of the reflection dark part is a predetermined shape. Further, a control unit that irradiates the light source with inspection light in which the shape of the reflection dark part becomes a predetermined shape based on the information, and a surface of the inspection object based on an image of the inspection object irradiated with the inspection light. And an inspection unit for inspecting.

  The appearance inspection accuracy of the inspection object can be improved.

It is the schematic of an inspection reference light production | generation apparatus and an inspection apparatus. It is a figure which shows the projection surface of a light source, and the picked-up image of a camera. It is a figure which shows the hardware structural example of an electronic controller. It is a block diagram for demonstrating the content of control. (A)-(D) are the figures for demonstrating the setting method of an illumination pattern. It is a figure for demonstrating the setting method of the desired width | variety of a dark part. It is a flowchart for demonstrating the test | inspection reference light production | generation method. It is a flowchart for demonstrating an inspection method. (A), (B) is a figure which shows the modification of an illumination pattern.

  With reference to the drawings, an inspection reference light generation device, an inspection reference light generation method, an inspection device, and an inspection method as embodiments will be described. However, the embodiment described below is merely an example, and there is no intention of excluding various modifications and technical applications that are not explicitly described in the embodiment. In other words, the present embodiment can be implemented with various modifications (combining the embodiments and modifications) without departing from the spirit of the present embodiment.

  The inspection apparatus and inspection method of the present embodiment perform an appearance inspection of a cylindrical inspection object, and the inspection reference light generation device and the inspection reference light generation method of the present embodiment are used in an appearance inspection. Inspection reference light is set. In the appearance inspection, the presence or absence of irregularities (dents, protrusions, scratches, etc.) on the surface (cylindrical surface) of the inspection object is determined using a scene phenomenon. The inspection object here includes an arbitrary object having a cylindrical shape, and includes, for example, a dry battery, a button-type battery, an optical semiconductor device, a cylindrical illumination device, a glow starter, and the like.

[1. Device configuration]
FIG. 1 illustrates a system configuration of the inspection reference light generation device and the inspection device according to the present embodiment. In this system, a light source 1, a camera 2, a driving device 3, a lamp 5 and an electronic control device 10 connected thereto are provided. The light source 1 is a surface illumination device that irradiates light on the surface of a battery 4 that is an inspection object. The posture of the battery 4 at the time of inspection is set so that the axial direction is substantially horizontal. The light source 1 is arranged on one side in the axial direction and above the central axis of the battery 4 with reference to the inspection posture of the battery 4 as shown in FIG. Specific examples of the light source 1 include an illuminating device, a light projecting device, and a display device that can control an illumination pattern. For example, a liquid crystal display (LCD), an organic EL display (OELD, Organic Electro- Luminescence Display) and projector devices.

  The light projecting surface of the light source 1 is provided with an illuminating unit 6 that irradiates light and a band-shaped dark unit 7 having a lower brightness (luminance or illuminance) than the illuminating unit 6. The dark part 7 is provided inside the illumination part 6 (for example, a position sandwiched from the left and right by the illumination part 6) so that the periphery thereof is surrounded by the illumination part 6. The light projecting surface here refers to a planar portion that casts light on the surface of the battery 4. In the case of a liquid crystal display or an organic EL display, the light projecting surface corresponds to a display screen of the display body, and in the case of a projector, the light projection surface corresponds to a screen on which an image is projected. The light projecting surface is preferably arranged substantially perpendicular to the central axis of the battery 4, but can be arranged inclined with respect to the central axis.

  The light source 1 can arbitrarily change the amount of light in each of the illumination unit 6 and the dark unit 7. Moreover, the shape of the dark part 7 (namely, the shape of parts other than the illumination part 6) can be changed arbitrarily. The dark part 7 of this embodiment can change arbitrarily the width | variety and the direction (inclination) of a boundary line with the illumination part 6. FIG. For example, as shown in FIG. 2, it is possible to make the dark part 7 into a strip shape with a constant width, or as shown in FIG. 1, it is also possible to make it a radiation line shape whose width increases toward the top.

  A camera 2 for photographing the surface of the battery 4 is disposed on the other side in the axial direction opposite to the light source 1 with the battery 4 interposed therebetween. The camera 2 is disposed above the central axis of the battery 4 in a vertical plane passing through the central axis of the battery 4. In addition, the shooting range of the camera 2 is set so as to look down on the entire battery 4. The angle θ between the shooting direction of the camera 2 and the central axis of the battery 4 is set to an angle at which almost the entire surface of the battery 4 reflects the illumination light from the light source 1 (for example, a small angle of about 10 ° or less). Is done. The distance between the camera 2 and the battery 4 is set according to the amount of light emitted from the light source 1, the area of the light projecting surface of the light source 1 (the size of the illumination unit 6), and the like. By using the scene phenomenon, regular reflection on the surface of the battery 4 is enhanced. Thereby, the image photographed by the camera 2 is not easily affected by the material and the pattern on the surface of the battery 4, and the appearance inspection accuracy is improved. In addition, as shown in FIG. 2, on the surface of the battery 4, a bright part where the light irradiated from the illumination unit 6 is reflected and a dark part corresponding to the dark part 7 are formed. Hereinafter, the former is referred to as a reflective illumination unit 8 and the latter is referred to as a reflection dark unit 9.

  The drive device 3 is a device for driving the battery 4 to rotate about the axis. The driving device 3 is provided with a mechanism for rotating the battery 4 while keeping the position of the battery 4 substantially constant. FIG. 1 illustrates a mechanism for supporting the lower side of the battery 4 with two rows of rollers. The roller is rotatably provided by an electric motor (not shown). By rotating the battery 4, the position of the surface of the battery 4 where the light emitted from the light source 1 is reflected is changed, so that the surface of the battery 4 can be easily inspected over the entire circumference. The lamp 5 is an electric lamp for notifying that irregularities are found on the surface of the battery 4 in the appearance inspection (the inspection result is NG).

  The electronic control device 10 is a computer having both a function of performing an appearance inspection of the battery 4 and a function of generating inspection reference light used in the appearance inspection. In the appearance inspection process, an inspection program is executed along an inspection process flow to be described later. Moreover, in the preparatory process which is the pre-process of the appearance inspection, an inspection preparation program is executed along an inspection preparation process flow which will be described later. As shown in FIG. 3, the electronic control unit 10 includes a processor 21 (CPU, central processing unit), a memory 22 (main memory, main storage unit), an auxiliary storage unit 23, an interface unit 24, a recording medium drive 25, and the like. They are built in and are communicably connected to each other via the internal bus 26.

  The processor 21 is a central processing unit that incorporates a control unit (control circuit), an arithmetic unit (arithmetic circuit), a cache memory (register group), and the like. The memory 22 is a storage device that stores a program and working data, and includes, for example, a ROM (Read Only Memory) and a RAM (Random Access Memory). On the other hand, the auxiliary storage device 23 is a memory device that stores data and firmware that are held for a longer time than the memory 22. For example, a nonvolatile memory such as a flash memory or an EEPROM (Electrically Erasable Programmable Read-Only Memory) is used. Included in this. The interface device 24 controls input / output (I / O) between the electronic control device 10 and the outside.

  The recording medium drive 25 is a reading device that reads information recorded and stored in a recording medium 27 (removable medium) such as an optical disk or a semiconductor memory. The program executed by the electronic control device 10 may be recorded and stored in the memory 22, for example, or may be recorded and stored in the auxiliary storage device 23. Alternatively, a program may be recorded and stored on the recording medium 27, and the program written on the recording medium 27 may be read into the electronic control device 10 via the recording medium drive 25.

[2. Control configuration]
FIG. 4 is a block diagram for explaining the processing contents of the inspection program and the inspection preparation program executed by the processor 21 of the electronic control device 10. These processing contents are recorded as an application program in the auxiliary storage device 23, the recording medium 27, etc., and are expanded on the memory 22 and executed. When the processing contents executed here are functionally classified, these programs are provided with a setting unit 11, a storage unit 12, an acquisition unit 13, a control unit 14, an inspection unit 15, and a drive unit 16. The inspection preparation program includes at least the setting unit 11 and preferably also includes the storage unit 12. The inspection program includes at least the acquisition unit 13, the control unit 14, and the inspection unit 15, and preferably includes the drive unit 16.

  The setting unit 11 sets the shape of the dark portion 7 on the light projection surface of the light source 1 so that the shape of the reflection dark portion 9 in the image photographed by the camera 2 becomes a predetermined shape suitable for appearance inspection. Here, the “predetermined shape suitable for appearance inspection” includes, for example, a line shape (straight shape, curved shape), a strip shape, a rectangular shape, a trapezoidal shape, a triangular shape, a wavy shape, and the like. Here, if the light of the illumination pattern in which the shape of the reflection dark portion 9 has a predetermined shape is called inspection reference light, the setting unit 11 has a function of setting the inspection reference light. The setting unit 11 of the present embodiment sets the shape of the dark part 7 in which the shape of the reflection dark part 9 is a band having a certain width. As shown in FIG. 2, when the shape of the dark portion 7 on the light projecting surface of the light source 1 is a band having a certain width, the shape of the reflective dark portion 9 is an inverted trapezoidal shape that is narrowed downward. On the other hand, if the shape of the dark portion 7 is an inverted trapezoidal shape, the shape of the reflective dark portion 9 is a band having a certain width.

  In order to grasp the relationship between the shape of the dark part 7 and the shape of the reflection dark part 9, the position of the virtual image formed by the light of the illumination part 6 and the dark part 7 reflected on the surface of the battery 4 may be calculated. In addition, in order to easily set the shape of the dark part 7 in which the reflection dark part 9 has a constant width, the shape of the reflection dark part 9 when the dark part 7 is a belt having a constant width is acquired, and a shape similar to the shape (or It is conceivable that the shape of the dark portion 7 is a similar shape. In this case, the shape of the dark part 7 may be set on the basis of the position on the light projection surface corresponding to the position where the width of the reflection dark part 9 becomes the desired width W.

  A specific setting method by the setting unit 11 will be described. First, the illumination unit 6 is set on the entire light projecting surface of the light source 1, and the amount of illumination light is adjusted so that the pattern is not visible on the surface of the battery 4 (FIG. 5A). Next, a band-like dark part 7 is formed inside the illumination part 6 on the light projection surface of the light source 1, and the reflected dark part 9 reflected on the surface of the battery 4 is photographed by the camera 2. At this time, the dark portion 7 has a constant width [FIG. 5B]. Thereby, the width of the reflection dark portion 9 in the captured image becomes thinner as it goes downward (closer to the camera 2).

  The setting unit 11 specifies a position 17 in the vertical direction where the width of the reflection dark portion 9 becomes the desired width W in the image. As shown in FIG. 6, the desired width W can be calculated based on the pixel width P corresponding to the reflection dark portion 9 in the image. The reflected illumination unit 8 and the reflected dark unit 9 can be identified based on the luminance of each pixel, the luminance change amount in the horizontal direction, and the like. Thereafter, as illustrated in FIG. 5C, the setting unit 11 specifies the position 18 of the dark part 7 on the light projection surface corresponding to the position 17 of the reflection dark part 9, and sets the shape of the dark part 7 with reference to the position 18. To do. For example, the entire shape of the dark part 7 is an inverted trapezoidal shape while the width of the position 18 is fixed. At this time, the shape of the dark part 7 may be an inverted trapezoidal shape widened at a constant rate, or may be similar to the reflective dark part 9 in FIG. Further, the width of the dark portion 7 may be partially expanded or reduced according to the surface processing state, the painted state, the pattern, or the like of the battery 4. By setting the shape of the dark part 7 as described above, the shape of the reflective dark part 9 becomes a band having a certain width [FIG. 5C].

  The storage unit 12 stores the shape of the dark part 7 set in this way and the battery 4 in association with each other. The reason for associating the shape of the dark portion 7 with the battery 4 is that the shape of the dark portion 7 in which the reflective dark portion 9 is a band having a certain width is different if the shape of the battery 4 and the surface coating are different. By storing the shape of the dark part 7 and the battery 4 in association with each other, it is possible to generate inspection reference light that matches the size and type of the inspection object.

  The acquisition unit 13 acquires information on the shape of the dark part 7 in which the shape of the reflection dark part 9 becomes a predetermined shape when performing an appearance inspection. Here, the shape of the dark portion 7 associated with the battery 4 is read from the storage unit 12 as information on the inspection reference light used in the appearance inspection. For example, as shown in FIG. 5C, the shape information of the inverted trapezoidal dark portion 7 is read. The information on the shape of the dark part 7 acquired here is transmitted to the control part 14.

  The control unit 14 irradiates the light source 1 with inspection reference light in which the shape of the reflection dark portion 9 becomes a predetermined shape based on the information acquired by the acquisition unit 13 in the appearance inspection. Here, for example, the shapes of the illumination part 6 and the dark part 7 on the light projection surface are controlled so that light of an illumination pattern suitable for the surface shape of the battery 4 is emitted from the light source. As a result, as shown in FIG. 5C, the shape of the reflection dark portion 9 becomes a band having a constant width. When the appearance inspection is started, the control unit 14 controls the camera 2 to start capturing an image of the reflection dark portion 9. Information on the image captured by the camera 2 is transmitted to the inspection unit 15.

  The inspection unit 15 inspects the presence or absence of irregularities on the surface of the battery 4 based on the image of the battery 4 irradiated with the inspection reference light. Here, a region in the image including the reflection dark portion 9 is specified as the inspection range 19 and it is determined whether or not the shape of the reflection dark portion 9 is deformed. As shown in FIG. 5D, the inspection unit 15 determines that “unevenness has been found on the surface of the battery 4” when the reflection dark portion 9 includes the deformation 20, and sends a lamp signal to the lamp 5. Output the lamp 5 to light. On the other hand, when the deformation 20 is not seen in the reflection dark portion 9, it is determined that “unevenness is not found on the surface of the battery 4”, and the lamp 5 is kept off.

  The drive unit 16 controls the operating state of the drive device 3. When the appearance inspection is started, the driving unit 16 outputs a driving signal to the driving device 3 to rotate the battery 4 around the axis. Further, the rotation speed of the battery 4 (drive speed of the drive device 3) is set to a speed according to the photographing ability (shutter speed or frame rate) of the camera 2. Thereby, the position image | photographed with the camera 2 among the surfaces of the battery 4 changes, and the surface of the battery 4 is image | photographed over a perimeter. The driving device 3 may be stopped after the camera 2 has photographed the entire surface of the battery 4.

[3. flowchart]
FIG. 7 is an example of an inspection preparation process flow, and FIG. 8 is an example of an inspection process flow.
In the inspection preparation process flow, after the amount of illumination light is adjusted so that the pattern cannot be seen on the surface of the battery 4 (step A1), a dark portion 7 having a certain width is formed inside the illumination unit 6 on the light projecting surface of the light source 1. (Step A2). In this state, the surface of the battery 4 is photographed by the camera 2 (step A3), and the position 17 where the reflection dark portion 9 in the image has the desired width W is specified (step A4). Further, the position 18 of the dark part 7 on the light projection surface corresponding to the position 17 is specified (step A5), and the entire shape of the dark part 7 is set by the setting unit 11 with the position 18 as a reference (step A6). For example, the shape of the dark portion 7 is set so that the overall shape of the dark portion 7 is similar to the reflective dark portion 9 while the width of the position 18 is fixed. Further, the width of the dark portion 7 is finely adjusted according to the surface processing state, painting state, pattern, etc. of the battery 4. The shape of the dark part 7 set here is associated with the battery 4 and stored in the storage part 12.

  In the inspection process flow, the illumination condition (the shape of the dark part 7 associated with the battery 4) set in the inspection preparation process flow is read by the acquisition unit 13, and then the light source 1 emits inspection reference light by the control unit 14. (Step B1). Further, a driving signal is output from the driving unit 16 to the driving device 3 to rotate the battery 4 (step B2), and the surface of the rotating battery 4 is photographed by the camera 2 (step B3). The camera 2 shoots the surface of the battery 4 every time the battery 4 rotates, for example, about 12 °, and shoots 30 images for each battery 4. Thereby, the entire periphery of the battery 4 is covered.

  In the inspection unit 15, with respect to one of the images photographed by the camera 2, the inspection darkness part 9 in the image is cut out from the inspection range 19 (step B 4), grayscale processing is performed, and binarization processing is performed. Is performed (steps B5 and B6). As a result, the boundary between the white pixel corresponding to the reflection illumination unit 8 and the black pixel corresponding to the reflection dark unit 9 becomes clear. Thereafter, the shape of the reflection dark portion 9 is extracted (step B7), and it is determined whether or not the deformation 20 is included in the reflection dark portion 9 (step B8).

  If the deformation 20 is included in the inspection range 19, it is determined that irregularities are found on the surface of the battery 4, the lamp 5 is controlled to be turned on (step B11), and the inspection ends. On the other hand, when the deformation | transformation 20 is not contained in the test | inspection range 19, control from step B4 to step B8 is repeated about another image (step B9). When the inspection for all the images is completed, it is determined that no irregularities are found on the surface of the battery 4 (step B10), and the inspection ends.

[4. Action, effect]
(1) By setting the shape of the dark portion 7 with the shape of the reflective dark portion 9 on the image as a predetermined shape by the setting unit 11, it is possible to easily determine the presence or absence of unevenness on the basis of the shape of the reflective dark portion 9. Inspection reference light for appearance inspection can be generated. By inspecting the appearance of the battery 4 using the inspection reference light, it is possible to accurately determine the presence / absence of irregularities, the appearance inspection accuracy can be improved, and the quality control accuracy can be improved.

(2) By correlating the shape of the dark part 7 set by the setting part 11 with the battery 4 and storing it in the storage part 12, the inspection reference light suitable for the size, type, surface processing, etc. of the battery 4 can be obtained by visual inspection. The appearance inspection accuracy of the battery 4 can be improved.
(3) Inspection reference light for appearance inspection that can easily determine the presence or absence of irregularities based on the width dimension of the reflection dark part 9 by irradiating the light source 1 with illumination that makes the width of the reflection dark part 9 constant. Can be generated. Thereby, the inspection sensitivity can be stabilized, the appearance inspection accuracy can be further improved, and the quality control accuracy can be further improved.

(4) Further, as shown in FIGS. 5B and 5C, the shape similar to the reflection dark portion 9 when the dark portion 7 has a constant width is set as the shape of the dark portion 7 for inspection, thereby reflecting Inspection reference light with the dark portion 9 having a substantially constant width can be easily generated, and appearance inspection accuracy and quality control accuracy can be further improved. Further, it is possible to reduce the calculation load of the electronic control device 10 for setting the inspection reference light.
(5) Further, as shown in FIG. 5 (B), the position 18 of the dark part 7 on the light projection surface corresponding to the position 17 where the width of the reflection dark part 9 becomes a predetermined width is set as the reference position, whereby the reflection dark part. Inspection reference light capable of securing a desired width W of 9 can be easily generated, and appearance inspection accuracy and quality control accuracy can be further improved. Further, it is possible to reduce the calculation load of the electronic control device 10 for setting the inspection reference light.

(6) By setting the width of the dark portion 7 according to the surface processing state, paint state, pattern, etc. of the battery 4, the reflected dark portion 9 having a certain width is photographed regardless of the manner of reflection on the surface of the battery 4. It becomes possible to do. Therefore, the appearance inspection accuracy and quality control accuracy can be further improved.
(7) The information of the shape of the dark part 7 which makes the shape of the reflective dark part 9 on the image a predetermined shape is acquired by the acquisition unit 13, and the appearance inspection is performed using this information, so that the shape of the reflective dark part 9 is used as a reference As a result, it is possible to easily determine the presence or absence of unevenness, and to improve the appearance inspection accuracy and the quality control accuracy.

(8) By providing the driving device 3 and the driving unit 16 that rotationally drive the battery 4 around the axis, the entire surface of the battery 4 can be inspected, and appearance inspection accuracy and quality control accuracy can be improved. it can.
(9) By determining the deformation of the reflection dark portion 9 by the inspection unit 15, it is possible to accurately determine the presence or absence of irregularities, and it is possible to improve the appearance inspection accuracy and the quality control accuracy.

[5. Modified example]
In the above-described embodiment, the electronic control device 10 having the function of performing the appearance inspection of the battery 4 and the function of generating the inspection reference light used in the appearance inspection is illustrated, but these functions are separated. Is possible. In order to realize the former function, at least the setting unit 11 may be provided in the electronic control device 10. Moreover, what is necessary is just to provide the acquisition part 13, the control part 14, and the test | inspection part 15 in the electronic controller 10 in order to implement | achieve the latter function.

  In the above-described embodiment, as illustrated in FIGS. 5C and 5D, the dark portion 7 is illustrated as having an inverted trapezoidal shape, but the specific shape of the dark portion 7 is not limited thereto. That is, the setting unit 11 may partially widen or reduce the width of the dark part 7 according to the surface processing state or the coating state of the battery 4. For example, when the region R on the surface of the battery 4 is mirror-finished, regular reflection in the region R becomes strong, so that the width of the reflection dark portion 9 can be narrowed. On the other hand, as shown in FIG. 9A, if the width of the dark portion 7 in the region Q on the light projection surface corresponding to the region R is set large, the width of the reflected dark portion 9 in the image is made substantially constant. Is possible.

  In the above-described embodiment, the shape of the dark portion 7 in which the shape of the reflective dark portion 9 is a band having a certain width has been described in detail. It becomes possible. For example, as shown in FIG. 9B, the arrangement of the dark portions 7 on the light projecting surface may be radial so that the reflective dark portions 9 have a plurality of strip shapes. In this case, a parallel line having a certain width can be drawn on the surface of the battery 4 by forming the inverted trapezoidal shape such that each dark part 7 becomes thicker as the position away from the battery 4. In this case, inspection accuracy can be improved by inspecting each line for deformation.

[6. Addendum]
The following additional remarks are disclosed with respect to the embodiment including the above modification.
[6-1. Inspection standard light generator]
(Appendix 1)
A light source having a light projecting surface, which is arranged on one side in the axial direction of a cylindrical inspection object, and is formed with an illumination part that irradiates light to the inspection object and a belt-like dark part having a lightness lower than that of the illumination part When,
A camera that captures a reflection dark part in which the dark part is reflected on the surface of the inspection object from the other side in the axial direction of the inspection object;
A setting unit for setting the shape of the dark part where the shape of the reflection dark part is a predetermined shape;
An inspection reference light generation device comprising:
(Appendix 2)
The inspection reference light generation device according to appendix 1, further comprising a storage unit that stores the shape of the dark part set by the setting unit and the inspection object in association with each other.
(Appendix 3)
The inspection reference light generation device according to appendix 1 or 2, wherein the predetermined shape is a belt having a constant width.
(Appendix 4)
The setting part sets the shape of the dark part using a shape similar to the shape of the reflection dark part photographed when the shape of the dark part is set to a certain width. The inspection reference light generation device according to any one of the above.
(Appendix 5)
Any one of appendices 1 to 4, wherein the setting unit sets the shape of the dark portion with reference to a position on the light projecting surface corresponding to a position where the width of the reflection dark portion becomes a predetermined width. The inspection reference light generator according to item 1.
(Appendix 6)
The inspection reference light generation device according to any one of appendices 1 to 5, wherein the setting unit sets a width of the dark part according to a surface processing state or a coating state of the inspection object. .

[6-2. Inspection standard light generation method]
(Appendix 7)
A light source having a light-projecting surface in which an illumination unit that irradiates light onto a cylindrical inspection object and a belt-like dark part that is lighter than the illumination unit is formed, and the inspection object is illuminated from one side in the axial direction. ,
The reflected dark part formed by reflecting the dark part on the surface of the inspection object is photographed with a camera from the other side in the axial direction of the inspection object,
A method for generating inspection reference light, wherein the shape of the dark part is set so that the shape of the reflection dark part is a predetermined shape.
(Appendix 8)
The inspection reference light generation method according to appendix 7, wherein the shape of the dark portion where the shape of the reflection dark portion is a predetermined shape and the inspection object are stored in association with each other.
(Appendix 9)
9. The inspection reference light generation method according to appendix 7 or 8, wherein the predetermined shape is a band having a constant width.
(Appendix 10)
Any one of appendices 7 to 9, wherein the shape of the dark part is set using a shape similar to the shape of the reflected dark part photographed when the dark part has a constant width. The inspection reference light generation method described.
(Appendix 11)
The shape of the dark part is set on the basis of a position on the light projecting surface corresponding to a position where the width of the reflection dark part becomes a predetermined width, according to any one of appendixes 7 to 10, Inspection reference light generation method.
(Appendix 12)
The inspection reference light generation method according to any one of appendices 7 to 11, wherein the width of the dark portion is set according to a surface processing state or a coating state of the inspection object.

[6-3. Inspection device]
(Appendix 13)
A light source having a light projecting surface, which is arranged on one side in the axial direction of a cylindrical inspection object, and is formed with an illumination part that irradiates light to the inspection object and a belt-like dark part having a lightness lower than that of the illumination part When,
A camera that captures a reflection dark part in which the dark part is reflected on the surface of the inspection object from the other side in the axial direction of the inspection object;
An acquisition unit that acquires information on the shape of the dark part, where the shape of the reflection dark part is a predetermined shape;
A control unit that irradiates the light source with inspection light in which the shape of the reflection dark part is a predetermined shape based on the information;
An inspection unit that inspects the surface of the inspection object based on the image of the inspection object irradiated with the inspection light;
An inspection apparatus comprising:
(Appendix 14)
The inspection apparatus according to appendix 13, wherein the predetermined shape is a belt having a constant width.
(Appendix 15)
The inspection apparatus according to appendix 13 or 14, further comprising a drive unit that rotationally drives the inspection object around an axis.
(Appendix 16)
The inspection apparatus according to appendices 13 to 15, wherein the inspection unit determines deformation of the reflection dark portion in an image of the inspection target irradiated with the inspection light.

[6-4. Inspection method]
(Appendix 17)
A light source having a light-projecting surface in which an illumination unit that irradiates light onto a cylindrical inspection object and a belt-like dark part that is lighter than the illumination unit is formed, and the inspection object is illuminated from one side in the axial direction. ,
Photographing the reflection dark part formed by reflecting the dark part on the surface of the inspection object from the other side in the axial direction of the inspection object,
Acquire information on the shape of the dark part, where the shape of the reflective dark part is a predetermined shape,
Based on the information, irradiate the light source with inspection light in which the shape of the reflection dark portion is a predetermined shape,
An inspection method comprising inspecting a surface of the inspection object based on an image of the inspection object irradiated with the inspection light.
(Appendix 18)
The inspection method according to appendix 17, wherein the predetermined shape is a band having a constant width.
(Appendix 19)
19. The inspection method according to appendix 17 or 18, wherein the inspection object is rotationally driven around an axis.
(Appendix 20)
The inspection method according to any one of appendices 17 to 19, wherein the deformation of the reflection dark portion in the image of the inspection object irradiated with the inspection light is determined.

DESCRIPTION OF SYMBOLS 1 Light source 2 Camera 3 Drive apparatus 4 Battery 5 Lamp 6 Illumination part 7 Dark part 8 Reflection illumination part 9 Reflection dark part 10 Electronic controller 11 Setting part 12 Storage part 13 Acquisition part 14 Control part 15 Inspection part 16 Drive part

Claims (12)

A light source having a light projecting surface, which is arranged on one side in the axial direction of a cylindrical inspection object, and is formed with an illumination part that irradiates light to the inspection object and a belt-like dark part having a lightness lower than that of the illumination part When,
A camera that captures a reflection dark part in which the dark part is reflected on the surface of the inspection object from the other side in the axial direction of the inspection object;
A setting unit for setting the shape of the dark part where the shape of the reflection dark part is a predetermined shape;
An inspection reference light generation device comprising: The inspection reference light generation device according to claim 1, further comprising a storage unit that stores the shape of the dark part set by the setting unit and the inspection object in association with each other. The inspection reference light generation device according to claim 1, wherein the predetermined shape is a band having a constant width. The said setting part sets the shape of the said dark part using the shape similar to the shape of the said reflection dark part image | photographed when the shape of the said dark part was made into fixed width, The 1-3. The inspection reference light generation device according to any one of the above. The said setting part sets the shape of the said dark part on the basis of the position on the said light projection surface corresponding to the position where the width | variety of the said reflection dark part becomes predetermined width, The any one of Claims 1-4 characterized by the above-mentioned. The inspection reference light generation device according to claim 1. The inspection reference light generation according to claim 1, wherein the setting unit sets a width of the dark part according to a surface processing state or a coating state of the inspection object. apparatus. A light source having a light-projecting surface in which an illumination unit that irradiates light onto a cylindrical inspection object and a belt-like dark part that is lighter than the illumination unit is formed, and the inspection object is illuminated from one side in the axial direction. ,
The reflected dark part formed by reflecting the dark part on the surface of the inspection object is photographed with a camera from the other side in the axial direction of the inspection object,
A method for generating inspection reference light, wherein the shape of the dark part is set so that the shape of the reflection dark part is a predetermined shape. A light source having a light projecting surface, which is arranged on one side in the axial direction of a cylindrical inspection object, and is formed with an illumination part that irradiates light to the inspection object and a belt-like dark part having a lightness lower than that of the illumination part When,
A camera that captures a reflection dark part in which the dark part is reflected on the surface of the inspection object from the other side in the axial direction of the inspection object;
An acquisition unit that acquires information on the shape of the dark part, where the shape of the reflection dark part is a predetermined shape;
A control unit that irradiates the light source with inspection light in which the shape of the reflection dark part is a predetermined shape based on the information;
An inspection unit that inspects the surface of the inspection object based on the image of the inspection object irradiated with the inspection light;
An inspection apparatus comprising: The inspection apparatus according to claim 8, wherein the predetermined shape is a belt having a constant width. The inspection apparatus according to claim 8, further comprising a drive unit that rotationally drives the inspection object around an axis. The inspection apparatus according to claim 8, wherein the inspection unit determines deformation of the reflection dark portion in an image of the inspection object irradiated with the inspection light. A light source having a light-projecting surface in which an illumination unit that irradiates light onto a cylindrical inspection object and a belt-like dark part that is lighter than the illumination unit is formed, and the inspection object is illuminated from one side in the axial direction. ,
Photographing the reflection dark part formed by reflecting the dark part on the surface of the inspection object from the other side in the axial direction of the inspection object,
Acquire information on the shape of the dark part, where the shape of the reflective dark part is a predetermined shape,
Inspecting the surface of the inspection object based on the image of the inspection object irradiated with the inspection light by irradiating the light source with inspection light having a predetermined shape of the reflection dark portion based on the information Inspection method.

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