JP2014055845A - Component inspection apparatus and component inspection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that in a conventional technique, it is difficult to accurately detect the shape of a component arranged in a bottom surface in a cylindrical object, because light reflected by the inside of the cylindrical object and a both end-opened type conical mirror is irregularly reflected in the cylindrical object, to enter an imaging apparatus.SOLUTION: A component inspection apparatus (100) includes a cylindrical scope (105), a light-emitting component (103) fixed to the outer periphery of the scope, and an imaging apparatus (104) connected to the scope and photographing an inspection target formed in a cylindrical inspected body.

Description

  The present invention relates to a component inspection apparatus and a component inspection method. In particular, the present invention relates to a technique for photographing a part on a bottom surface inside a cylindrical inspection body and inspecting the part from the image.

  Patent Document 1 discloses an inspection technique in which a double-end-opening conical mirror having an upper end and a lower end is inserted into a cylindrical object, and images of the inner and outer surfaces and the inner bottom surface of the cylindrical object are simultaneously captured. In the technique of Patent Document 1, the illumination light from the illumination device is applied to the inner bottom surface of the cylindrical object through the inside of the double-end open conical mirror. Then, the light reflected from the inner bottom surface of the cylindrical object enters the imaging device through the inside of the double-end open conical mirror, thereby acquiring an image inside the cylindrical object.

JP 2003-207458 A

  In the technique of Patent Document 1, since the illumination light from the illumination device is irradiated to the inner bottom surface of the cylindrical object through the inside of the double-end opening conical mirror, the reflected light from the inside of the cylindrical object and the double-end opening conical mirror is cylindrical. The light is diffusely reflected in the object and enters the imaging device. For this reason, with the technique of Patent Document 1, it is difficult to accurately detect the part shape arranged on the bottom surface inside the cylindrical object.

  According to a first aspect of the present invention, there is provided a cylindrical scope, a light-emitting component fixed to the outer periphery of the scope, an imaging apparatus that is connected to the scope and photographs an inspection object formed inside the cylindrical inspection body. And a parts inspection device.

  According to a second aspect of the present invention, there is provided an imaging apparatus for photographing a cylindrical scope, a light emitting component fixed to the outer periphery of the scope, and an inspection object connected to the scope and formed inside the cylindrical inspection body. A component inspection method comprising: preparing a component inspection apparatus including: and inspecting an inspection object.

  In the component inspection apparatus and the component inspection method according to the present invention, the edge of the upper surface of the inspection object inside the inspection object can be reliably recognized. Therefore, accurate inspection of defects such as chipping and distortion of the assembled parts is realized.

It is a schematic diagram which shows the component inspection apparatus which concerns on 1st Embodiment of this invention. It is a mimetic diagram showing an example of the jig concerning a 1st embodiment of the present invention. It is a schematic diagram which shows the components inspection apparatus in the state which inserts a scope in a test body and inspects a test object. It is sectional drawing which fractured | ruptured the test body etc. in FIG. 3 in the perpendicular plane containing dashed-dotted line A1-A2. FIG. 5 is a schematic diagram illustrating a difference in reflection of light irradiated from the optical fiber when the distance from the inner bottom surface of the inspection object of the scope and the optical fiber is changed in the cross-sectional view of FIG. 4. FIG. 5 is a schematic view showing a photographing range of the scope when the distance from the inner bottom surface of the inspection object of the scope and the optical fiber is changed in the cross-sectional view of FIG. 4. It is sectional drawing which fractured | ruptured the test target etc. in FIG. 3 in the horizontal surface containing dashed-dotted line A3-A4. It is a conceptual diagram which synthesize | combines the image data of the edge of the upper surface of a test target object. It is a schematic diagram which shows the synthetic | combination image data regarding the edge of the upper surface of the test target which has a chip | tip and distortion, and the reference data regarding the said edge currently stored beforehand by the control apparatus. It is a test | inspection control flowchart of the test target object by the components inspection apparatus which concerns on 1st Embodiment of this invention. It is a schematic diagram which shows the components inspection system which concerns on 2nd Embodiment of this invention. It is a schematic diagram which shows the component inspection apparatus which concerns on 3rd Embodiment of this invention. It is sectional drawing which fractured | ruptured the scope, the light emitting component, the test body, etc. by the vertical plane similarly to FIG.

  Hereinafter, exemplary embodiments for carrying out the present invention will be described in detail with reference to the drawings. However, dimensions, materials, shapes, relative positions of components, and the like described in the following embodiments are arbitrary, and can be changed according to the structure of the apparatus to which the present invention is applied or various conditions. Further, unless otherwise specified, the scope of the present invention is not limited to the form specifically described in the embodiments described below. In the drawings described below, components having the same function are denoted by the same reference numerals, and repeated description thereof may be omitted.

[First embodiment]
FIG. 1 is a schematic diagram showing a component inspection apparatus 100 according to the first embodiment of the present invention. The component inspection apparatus 100 includes a control device 101, an illumination device 102, n optical fibers 103 (n is an integer of 1 or more), an imaging device 104, a scope 105, a jig 106, and an output device 107.

  The component inspection apparatus 100 according to the present embodiment can inspect the presence of defects such as chipping and distortion of the edge (contour) of the upper surface of the inspection object 109 formed inside the inspection body 108 by image processing.

  The control device 101 is a computer including a CPU and a memory, and is connected to the illumination device 102, the imaging device 104, the scope 105, and the output device 107. The control device 101 controls the illumination device 102, the imaging device 104, and the scope 105 in accordance with an operator or a program command to capture an internal image of the inspection object 108, process the captured internal image, and output the processed internal image. To the device 107.

  The illumination device 102 is connected to the optical fiber 103 and includes a light emission source such as an LED illumination, a fluorescent lamp, or a light bulb. The illuminating device 102 provides light to a predetermined place (site to be inspected) via the optical fiber 103 in accordance with a control signal from the control device 101. The optical fiber 103 according to the present embodiment is not limited to an optical fiber as long as it is a line that guides light from the illumination device 102 to a predetermined position. Further, the optical fiber 103 emits light from the lighting device 102 from its tip, and thus can be said to be a light emitting component.

  The imaging apparatus 104 is a digital camera that captures an image of an object to be inspected via the scope 105 in accordance with a control signal from the control apparatus 101 and provides image data of the object to the control apparatus 101.

  The scope 105 has a cylindrical shape extending in a straight line, and a lens or the like is provided therein. The light incident on one end 105s of the scope 105 is guided to the imaging device 104 connected to the other end. The optical fiber 103 is fixed to the outer surface of the scope 105 by the jig 106 so that the distal end 105s of the scope 105 and the distal end 103s of the optical fiber 103 are located on the same plane.

  The output device 107 is configured by a computer system including a display, a printer, and the like. The output device 107 displays the data provided from the control device 101 on the screen, prints it, changes the data to predetermined data for application to other devices, or others according to the needs of the operator It has the function of.

  The inspection body 108 has a cylindrical shape with an upper surface opened, and is a component used for a predetermined application. An inspection object 109 that is a component to be inspected is formed on the inner bottom surface (that is, the inner bottom surface) of the inspection body 108. For example, the inspection body 108 is a cylinder of a vehicle engine, a hydraulic cylinder, or the like, and the inspection object 109 is a protrusion or the like provided on the inner bottom surface of the cylinder.

  The inspection object 109 has a cylindrical or cylindrical shape having a radius a and a height Z, and the central axis of the inspection object 109 coincides with the central axis of the inspection object 108. Further, the bottom surface of the inspection object 109 is fixed to the inner bottom surface of the inspection object 108, and the upper surface of the inspection object 109 is directed to the opening of the inspection object 108.

  The shapes, dimensions, materials, and the like of the inspection object 108 and the inspection object 109 are design items by the operator, and information regarding these can be stored in the control device 101 in advance. As will be described later, the component inspection apparatus 100 according to the present embodiment determines the positions of the optical fiber 103 and the scope 105 with respect to the inspection body 108 and the inspection object 109 in advance according to the dimensions of the inspection body 108 and the inspection object 109. Can be determined.

  FIG. 2 is a schematic diagram illustrating an example of the jig 106 according to the present embodiment. The jig 106 has an annular shape. In the center of the jig 106, a scope fixing hole 106a for allowing the scope 105 to pass and fixing to the scope 105 is formed. On the outer periphery of the scope fixing hole 106a, n optical fiber fixing holes 106a are provided. These optical fiber fixing holes 106 a are used for passing the optical fiber 103 and fixing the optical fiber 103. The diameter of the scope fixing hole 106 a substantially matches the outer diameter of the scope 105, and the diameter of the optical fiber fixing hole 106 b substantially matches the outer diameter of the optical fiber 103.

  In the component inspection apparatus 100 according to the present embodiment, the scope 105 and the optical fiber 103 are inserted into the inspection body 108 with the central axis of the inspection object 109 and the central axis of the scope 105 aligned. Also, as shown in FIG. 4 and the like, the center axis of the optical fiber 103 is positioned directly above the edge of the upper surface of the inspection object 109 when the inspection object 109 is inspected (the center axis is the edge The optical fiber 103 is fixed by a jig 106.

  FIG. 3 is a schematic diagram showing the component inspection apparatus 100 when the scope 105 is inserted into the inspection body 108 and the inspection object 109 is in an inspection state. As shown in FIG. 3, the scope 105 and the optical fiber 103 are inserted into the inspection body 108 so as to be disposed at predetermined positions with respect to the inspection body 108 and the inspection object 109 at the time of inspection.

  FIG. 4 is a cross-sectional view of the scope 105, the optical fiber 103, the inspection body 108, and the like in FIG. 3 cut along a vertical plane including the alternate long and short dash line A1-A2. In the following drawings, the jig 106 is omitted for simplicity of explanation.

  The scope 105 and the optical fiber 103 are inserted and disposed inside the inspection body 108 so that the distal end 105s of the scope 105 and the distal end 103s of the optical fiber 103 are separated from the inner bottom surface of the inspection body 108 by a distance X.

  The central axis 105 c of the scope 105 and the central axis 109 c of the inspection object 109 coincide with each other, and the central axis 103 c of the optical fiber 103 is located immediately above the edge of the upper surface of the inspection object 109. As will be described later, it is desirable that the center axis 105c of the scope 105 substantially coincides with the center axis 109c of the inspection object 109, but the center axis 103c of the optical fiber 103 is not necessarily directly above the edge of the upper surface of the inspection object 109. There is no need to be located. Positional errors can be tolerated without departing from the purpose of the present invention.

  Here, the radius and angle of view of the scope 105 are represented by d and 2θ, the radius and irradiation angle of the optical fiber 103 are represented by c and 2α, respectively, and the radius and height of the inspection object 109 are represented by a and Z, respectively. Further, the distance from the side surface of the inspection object 109 to the outer periphery of the imaging range of the scope 105 is represented by b, and the distance from the side surface of the inspection object 109 to the inner surface of the inspection object 108 is represented by Y. As can be understood from FIG. 4, d ≦ a−c, and there is a relationship of Xtan θ = a + b. These values are known parameters that can be determined in advance by the operator and can be stored in advance in the control device 101 or the like.

  When light is irradiated from the optical fiber 103 toward the upper surface of the inspection object 109, the light irradiated to the edge portion of the upper surface of the inspection object 109 is irregularly reflected. For this reason, the light DR irregularly reflected at the edge portion hardly enters the scope 105. On the other hand, the light irradiated from the optical fiber 103 to the other part of the upper surface of the inspection object 109 is specularly reflected, and the specularly reflected light MR1 enters the scope 105. Therefore, the imaging device 104 can capture an image with high contrast, and can accurately recognize the shape of the upper surface of the inspection object 109.

  In order to increase the contrast of the image and accurately recognize the shape of the upper surface of the inspection object 109, the light irradiated from the optical fiber 103 is regularly reflected from a part other than the inspection object 109, and the regular reflection is performed. It is necessary to avoid that the light MR2 enters the scope 105. This is because reflected light other than the inspection object 109 may reduce the contrast of the image of the inspection object 109 and may be mixed as noise in the image on the upper surface of the inspection object 109.

  As shown in FIG. 4, when the light irradiated from the optical fiber 103 is primarily reflected on the inner bottom surface of the inspection object 108, the reflected light MR <b> 2 goes to the outer surface of the scope 105 and does not enter the scope 105. That is, the influence of the primary reflected light on the inner bottom surface of the inspection object 108 on the captured image is small.

  However, when the light irradiated from the optical fiber 103 is primarily reflected on the inner side surface of the inspection object 108, the reflected light is secondarily reflected on the inner bottom surface of the inspection object 108, and this secondary reflected light is incident on the scope 105. there's a possibility that. In order to increase the contrast of the image and accurately recognize the shape of the upper surface of the inspection object 109, it is desirable to reduce the light directly irradiated from the optical fiber 103 to the inner surface of the inspection object 108.

  In the present embodiment, the secondary reflected light is incident on the scope 105 by optimally setting the height of the scope 105, that is, the distance X from the scope 105 to the inner bottom surface of the inspection object 108, as shown below. To avoid that.

  FIG. 5 is a schematic diagram showing a change in the optical path of the reflected light when the distance X from the inner bottom surface of the inspection body 108 of the scope 105 and the optical fiber 103 is changed in the cross-sectional view of FIG. When the irradiation angle (2α) of the optical fiber 103 is constant, whether or not the light irradiated from the optical fiber 103 directly hits the inner surface of the inspection body 108 depends on the inner bottom surface of the inspection body 108 at the tip 103s of the optical fiber 103. Depending on the distance X from

  Assume that the distal end 105s of the scope 105 and the distal end 103s of the optical fiber 103 are spaced apart from the inner bottom surface of the inspection body 108 by a distance X1. In this case, the light (dotted line L1) emitted from the end of the tip 103s of the optical fiber 103 (portion closest to the inner side surface of the inspection body 108) is primarily reflected on the inner bottom surface of the inspection body 108, After secondary reflection on the side surface, it goes to the outer surface of the scope 105. Therefore, in this case, the secondary reflected light that enters the scope 105 from the inner bottom surface and the inner side surface of the inspection object 108 is relatively small.

  Next, it is assumed that the distal end 105s of the scope 105 and the distal end 103s of the optical fiber 103 are spaced apart from the inner bottom surface of the inspection body 108 by a distance X2 (X2> X1). In this case, light (one-dot chain line L2) irradiated from the end of the tip 103s of the optical fiber 103 (the portion closest to the inner surface of the inspection body 108) is irregularly reflected at the corner of the inner bottom surface of the inspection body 108. Therefore, also in this case, the secondary reflected light that is primarily reflected from the inner side surface and the inner bottom surface of the inspection object 108 and enters the scope 105 is relatively small.

  On the other hand, it is assumed that the distal end 105s of the scope 105 and the distal end 103s of the optical fiber 103 are spaced apart from the inner bottom surface of the inspection body 108 by a distance X3 (X3> X2). In this case, the light (straight line L3) irradiated from the end of the tip 103s of the optical fiber 103 (the portion closest to the inner surface of the inspection body 108) is primarily reflected on the inner surface of the inspection body 108, and After further secondary reflection at the inner bottom surface, the light enters the scope 105. As described above, when the light irradiated from the optical fiber 103 is primarily reflected on the inner side surface of the inspection body 108, the secondary reflected light incident on the scope 105 increases from the inner side surface and the inner bottom surface of the inspection body 108. End up.

  Therefore, in order to reduce the amount of light that is regularly reflected from the inner bottom surface and the inner side surface of the inspection body 108 and enters the scope 105, the distal end 105s of the scope 105 and the distal end 103s of the optical fiber 103 are separated from the inner bottom surface of the inspection body 108. It is desirable to arrange them apart from X2.

  Even when there are a plurality of optical fibers 103, the above-described configuration can be similarly adopted.

  FIG. 6 is a schematic diagram showing an imaging range of the scope 105 when the distance X from the inner bottom surface of the inspection body 108 of the scope 105 and the optical fiber 103 is changed in the cross-sectional view of FIG. When the angle of view (2θ) of the scope 105 is constant, the imaging range of the scope 105 (the range in which the scope 105 can acquire light) depends on the distance X from the inner bottom surface of the inspection object 108 of the distal end 105s of the scope 105.

  When the distal end 105 s of the scope 105 and the distal end 103 s of the optical fiber 103 are spaced apart from the inner bottom surface of the inspection body 108 by a distance X4, the imaging range (the dotted line IA4 that is the outer periphery of the imaging range) on the central axis 105 c of the scope 105. The enclosed range) is only a part of the upper surface of the inspection object 109. In this case, the scope 105 (and the imaging device 104) cannot capture the edge of the upper surface to be inspected.

  When the distal end 105s of the scope 105 and the distal end 103s of the optical fiber 103 are spaced apart from the inner bottom surface of the inspection body 108 by a distance X5, an imaging range (a chain line IA5 that is an outer periphery of the imaging range) on the central axis 105c of the scope 105 is disposed. ) Includes the edge of the upper surface of the inspection object 109. Further, the outer periphery of the imaging range (dashed line IA5) is separated from the side surface of the inspection object 109 by a distance b2 on the inner bottom surface of the inspection object 108. In this case, the scope 105 can photograph the edge of the upper surface to be inspected.

  When the distal end 105s of the scope 105 and the distal end 103s of the optical fiber 103 are spaced apart from the inner bottom surface of the inspection body 108 by a distance X6, the imaging range (the straight line IA6 that is the outer periphery of the imaging range) on the central axis 105c of the scope 105 is arranged. The enclosed area) sufficiently includes the edge of the upper surface of the inspection object 109. The outer periphery (straight line IA6) of the imaging range is separated from the edge of the upper surface of the inspection object 109 by a distance h (h ≧ 0, preferably h ≧ Z) in a direction parallel to the central axis 105c of the scope 105, The inner bottom surface of the inspection body 108 is separated from the side surface of the inspection object 109 by a distance b3. In this case, the scope 105 can sufficiently capture the edge of the upper surface to be inspected.

  Therefore, in order to photograph the upper edge of the inspection object 108 to be inspected by the scope 105, the distal end 105s of the scope 105 and the distal end 103s of the optical fiber 103 are arranged apart from the inner bottom surface of the inspection object 108 by a distance X5 or more. There is a need to.

  As described above, in order to accurately inspect the edge of the upper surface of the inspection object 109, the distal end 105s of the scope 105 and the distal end 103s of the optical fiber 103 are spaced apart from the inner bottom surface of the inspection body 108 by a distance X5 or more. There is a need. Further, in order to clarify the contrast and to accurately recognize the shape of the upper surface of the inspection object 109, it is desirable to dispose it at a distance X2 or less from the inner bottom surface of the inspection object 108. Hereafter, this is expressed by a mathematical formula.

  With respect to the imaging range of the scope 105, it can be confirmed from FIGS. 4 to 6 that since Xtanθ = a + b and b = (h + Z) tanθ, h = XZ− (a / tanθ). In order for the edge of the upper surface of the inspection object 109 to be included in the imaging range of the scope 105, h ≧ 0 must be satisfied, so X−Z− (a / tan θ) ≧ 0, that is, X ≧ Z + (a / tan θ ) So that the distal end 105s of the scope 105 and the distal end 103s of the optical fiber 103 are separated from the inner bottom surface of the inspection body 108 by a distance X.

  Regarding the irradiation range of the optical fiber 103, in order to avoid the light irradiated from the end of the tip 103s of the optical fiber 103 (the portion closest to the inner surface of the inspection body 108) being primarily reflected on the inner surface of the inspection body 108, In FIG. 5, it is desirable that Xtanα ≦ (Yc), that is, X ≦ (Yc) / tanα. Here, Y is the distance from the side surface of the inspection object 109 to the inner side surface of the inspection object 108 on the inner bottom surface of the inspection object 108.

From the above, the distal end 105s of the scope 105 and the distal end 103s of the optical fiber 103 are expressed by Equation 1:
It is desirable that the distance from the inner bottom surface of the inspection body 108 is a distance X so as to satisfy the above condition.

  Next, in order to accurately inspect the edge of the upper surface of the inspection object 109, it is necessary that the light irradiated by the optical fiber 103 illuminates all the edges of the upper surface of the inspection object 109. In this embodiment, since all the edges on the upper surface of the inspection object 109 are to be inspected, it is necessary to illuminate all of the edges with the optical fiber 103. However, when only a part of the edges is inspected. It is not necessary to illuminate all of the edges, as long as it is possible to illuminate only that part.

  FIG. 7 is a cross-sectional view in which the inspection object 109 shown in FIG. 3 is broken along a horizontal plane including the alternate long and short dash line A3-A4. In the present embodiment, each of the n optical fibers 103 is arranged such that the central axis 103 c is positioned at equal intervals along the edge of the upper surface of the inspection object 109. Moreover, in this figure, the irradiation range LR of each optical fiber 103 is shown with a chain line.

In FIG. 7, the radius of the irradiation range 103LR on the upper surface of the inspection object 109 by each optical fiber 103 is approximately asinφ. Here, φ corresponds to ½ of the circumferential angle of the edge of the upper surface of the inspection object 109 included in one irradiation range 103LR. Further, as shown in FIG. 5, the radius of the irradiation range 103LR is represented by {c + (X−Z) tan α}. Therefore, asin φ = {c + (X−Z) tan α} and φ = sin ⁻¹ {[c + (X−Z) tan α] / a}.

  And in order to inspect | inspect all the edges of the upper surface of the test object 109 correctly, each irradiation range needs to contact | connect at least mutually. That is, it is necessary that at least φ = 2π / 2n. Therefore, in order to illuminate all the edges of the upper surface of the inspection object 109, φ may be 2π / 2n or more.

Therefore, the condition for illuminating all the edges of the upper surface of the inspection object 109 with the n optical fibers 103 is φ = sin ⁻¹ {[c + (X−Z) tan α] / a} ≧ 2π / 2n. Expressing this for X, Equation 2:
It becomes.

  As described above, in this embodiment, in order to accurately inspect the edge of the upper surface of the inspection object 109, the distal end 105s of the scope 105 and the distal end 103s of the optical fiber 103 are inspected so as to satisfy Expressions 1 and 2. It is desirable that the distance 108 be spaced from the inner bottom surface 108 by a distance X.

  Next, when acquiring an image of the edge of the upper surface of the inspection object 109, if light is guided from the illumination device 102 to all the plurality of optical fibers 103, light interference occurs between the adjacent optical fibers 103, and The probability that halation occurs at a part of the edge increases, and it may be difficult to detect the edge of the upper surface of the inspection object 109.

  In order to prevent such halation from occurring, the component inspection apparatus 100 according to the present embodiment sequentially guides light to each of the n optical fibers 103 by the illumination apparatus 102, and the imaging apparatus 104 detects the inspection object 109. It is desirable to sequentially acquire image data of the upper edge. Then, by synthesizing the acquired n pieces of image data of the edge in the control device 101, one piece of image data of the edge can be acquired.

  FIG. 8 is a conceptual diagram for synthesizing image data of the edge of the upper surface of the inspection object 109. In the present embodiment, light can be sequentially guided to each of the n optical fibers 103 to obtain partial images of the edge of the upper surface of the inspection object 109 and synthesize these partial images.

  That is, as indicated by reference numeral 801 in FIG. 8, when the lighting device 102 guides light to the first optical fiber 103, the image data 109 </ b> D− in the irradiation range 103 </ b> LR- 1 by the first optical fiber 103 is used. 1 is acquired by the imaging device 104.

  As described above, the light that is irradiated from the optical fiber 103 and hits the edge of the upper surface of the inspection object 109 is irregularly reflected, so that the secondary reflected light hardly enters the scope 105. On the other hand, the primary reflected light on the upper surface of the inspection object 109 enters the scope 105. For this reason, the contrast of the acquired image data is high, and the edge of the inspection object 109 can be accurately recognized by binarizing the image data.

  After the image data 109 </ b> D- 1 is acquired, the lighting device 102 stops guiding light to the first optical fiber 103 and guides light to the second optical fiber 103. As indicated by reference numeral 802 in FIG. 8, image data 109 </ b> D- 2 in the irradiation range 103 </ b> LR- 2 by the second optical fiber 103 is acquired by the imaging device 104.

  The same processing is performed for the third to nth optical fibers 103, and image data 109D-3 to 109D-n of the upper edge of the inspection object 109 are acquired.

  The acquired n pieces of image data 109D-1 to 109D-n are combined by the control device 101 to generate combined image data 109D (reference numeral 805). Based on the composite image data 109D, it is possible to inspect whether or not there is a defect such as a chip or distortion on the edge of the upper surface of the inspection object 109.

  FIG. 9 is a schematic diagram showing composite image data 109D relating to the upper edge of the inspection object 109 having chipping or distortion and reference data 900 relating to the edge stored in advance in the control device 101.

  In the control device 101, the composite image data 109 </ b> D is arranged on virtual coordinates and compared with known reference data 900 regarding the upper edge of the inspection target 109. If there is a defect such as a chip or distortion on the upper edge of the inspection object 109, coordinates 901 (corresponding to the chip) and coordinates 902 (corresponding to the distortion) having data different from the reference data 900 on the composite image data 109D. ) Exists. Therefore, the control device 101 can recognize the presence of a defect at the edge of the upper surface.

  Therefore, the component inspection apparatus 100 according to the present embodiment can inspect the presence of defects such as chipping and distortion of the upper surface by acquiring image data of the edge of the upper surface of the inspection object 109.

  In the above description, the configuration is such that the central axis 105 c of the scope 105 and the central axis 109 c of the inspection object 109 coincide with each other, and the central axis 103 c of the optical fiber 103 is positioned directly above the edge of the upper surface of the inspection object 109. explained. However, if the light guided by the optical fiber 103 is irradiated on the edge of the upper surface of the inspection object 109, there may be a shift in the positions of the central axes 103, 105c, and 109c. For example, even if the center axis 105c of the scope 105 and the center axis 109c of the inspection object 109 are shifted from each other by the distance Δ, in the above formulas 1 and 2, a = a + Δ, Y = Y + Δ Can be expressed.

  FIG. 10 is an inspection control flowchart of the inspection object 109 by the component inspection apparatus 100 according to the present embodiment.

  When the inspection process is started, an operator (or an automatic conveyance machine (not shown)) prepares the component inspection apparatus 100. (S1001)

  An operator (or an automatic conveyance machine (not shown)) prepares the inspection object 108. (S1002)

  The inspection body 108 has a cylindrical shape, and a cylindrical or cylindrical inspection object 109 is formed on the inner bottom surface thereof. The control unit 101 of the component inspection apparatus 100 moves the scope 105 so that the central axis of the inspection object 109 substantially coincides with the central axis of the scope 105 of the component inspection apparatus 100. (S1003)

  The control unit 101 moves the scope 105 and the like, and inserts the scope 105 and n optical fibers 103 fixed to the outer periphery thereof into the inspection body 108 from the opening of the inspection body 108. (S1004)

  The control unit 101 arranges the distal end 105 s of the scope 105 and the distal end 103 s of the optical fiber 103 at a predetermined position X from the inner bottom surface of the inspection body 108. As described above, the predetermined position X is appropriately determined within a preferable range based on the shapes, dimensions, and the like of the scope 105, the optical fiber 103, the inspection object 108, and the inspection object 109. (S1005)

  The control unit 101 controls the illumination device 102 of the component inspection apparatus 100, and the illumination device 102 sequentially guides light to each of the n optical fibers 103. Each of the optical fibers 103 sequentially emits light so as to illuminate the edge of the upper surface of the inspection object 109, and at the same time, the imaging device 104 of the component inspection apparatus 100 performs (n) image data of the edge of the upper surface. 109D-k (k = 1 to n) are sequentially acquired. (S1006)

  The imaging device 104 provides the acquired image data 109D-k to the control device 101. The control device 101 synthesizes the image data 109D-k to generate composite image data 109D. (S1007)

  The control device 101 compares the composite image data 109D with the reference data 900 to inspect for the presence of defects such as chipping and distortion of the upper surface (S1008).

  If there is another inspection body 108 to be inspected, the inspection process returns to S1002 (Yes in S1009), and if there is no other inspection body 108 to be inspected, the inspection process ends (No in S1009).

  Since the component inspection apparatus 100 according to the present embodiment can reliably recognize the edge (contour) of the upper surface of the inspection object 109 inside the inspection object 108, it can inspect defects such as chipping and distortion of the assembled component. Further, the component inspection apparatus 100 according to the present embodiment does not insert a mirror by fitting to the inner and outer surfaces of a cylindrical object as in the technique of Patent Document 1, but an inspection mechanism (scope 105 and optical fiber 103). Does not come into contact with the inner side surface of the inspection body 108, so that the surface is not damaged.

  In the component inspection apparatus 100 according to the present embodiment, there is no need to strictly match the central axis 105c of the scope 105 and the central axis 109c of the inspection object 109, so that the inspection speed and inspection accuracy can be improved and the manufacturing cost can be reduced. Realized. The component inspection apparatus 100 according to the present embodiment sequentially guides light to each of the n optical fibers 103, sequentially acquires image data of the illuminated upper surface, and then synthesizes the image data. Halation can be prevented.

[Second Embodiment]
FIG. 11 is a schematic diagram showing a component inspection system 1100 including the component inspection apparatus 100 according to the first embodiment, which is the second embodiment of the present invention.

  In addition to the component inspection apparatus 100, the component inspection system 1100 according to the present embodiment includes a system pedestal 1101, a frame 1102, a ball screw 1103, a holder 1104, an imaging apparatus pedestal 1105, a motor 1106, and an inspection object. A pedestal 1107 is provided.

  A frame 1102 is fixed on the system base 1101. A ball screw 1103 connected to the motor 1106 through the frame 1102 is disposed. A holder 1104 is fitted on the ball screw 1103. An imaging device base 1105 is fixed to the holder 1104.

  As the motor 1106 rotates the ball screw 1103, the holder 1104 moves back and forth. Accordingly, the holder 1104 and the imaging device base 1105, and the imaging device 104 and the scope 105 move back and forth. Thus, the scope 105 and the optical fiber 103 are inserted into the inspection body 108.

  For example, in the present embodiment, specifically, eight optical fibers 103 are fixed to the outer periphery of the scope 105 at equal intervals by a jig 106. The scope 105 has a radius d of 3 mm and an angle of view 2θ of 100 degrees. The radius c of the optical fiber 103 is 1 mm, and the irradiation angle 2α is 35 degrees. The inspection object 109 has a radius a of 5 mm and a height Z of 10 mm. Further, the distance Y from the side surface of the inspection object 109 on the inner bottom surface of the inspection body 108 to the inner surface of the inspection body 108 is 12 mm.

  In this case, when the scope 105 and the optical fiber 103 are inserted up to a distance of X (mm) from the inner bottom surface of the inspection body 108, it is desirable that X satisfies Expression 1 and Expression 2. That is, from Equation 1, it is desirable that 14.20 ≦ X ≦ 34.89, and from Equation 2 that X ≧ 12.90.

  Therefore, in the component inspection system 1000 according to the present embodiment, the scope 105 and the optical fiber 103 are inserted into the range of 14.20 ≦ X ≦ 34.89 (mm) from the inner bottom surface of the inspection object 108, thereby being inspected. Defects such as chipping and distortion of the upper surface of the object 109 can be accurately inspected.

[Third Embodiment]
FIG. 12 is a schematic diagram showing a component inspection apparatus 1200 according to the third embodiment of the present invention. The component inspection device 1200 is substantially the same as the component inspection device 100 according to the first embodiment, but includes a light emitting component power source 1201, a conductive wire 1202, and a light emitting component 1203 instead of the illumination device 102 and the optical fiber 103. It is different. Therefore, the description overlapping with the first and second embodiments is omitted as appropriate.

  The component inspection apparatus 1200 includes a control device 101, a light emitting component power source 1201, a conductive wire 1202, n light emitting components 1203, an imaging device 104, a scope 105, and an output device 107. Here, n is an integer of 1 or more. The control device 101, the imaging device 104, the scope 105, and the output device 107 are the same as those according to the first and second embodiments.

  The light-emitting component power source 1201 supplies power to the light-emitting component 1203 through the conductive line 1202. The conductive wire 1202 is a copper wire or other metal wire that conducts electricity, and is fixed to the outer surface of the scope 105 with an adhesive, a band, or the like (not shown). The light emitting component 1203 is a small LED lighting or a light bulb that emits light from the tip 1203s. The light emitting component 1203 is fixed to the outer surface of the scope 105 with an adhesive, a band, or the like (not shown) so that the tip 1203s of the light emitting component 1203 and the tip 105s of the scope 105 are located on the same plane.

  FIG. 13 is a cross-sectional view in which the scope 105, the light emitting component 1203, the inspection body 108, and the like are broken along a vertical plane, as in FIG.

  The central axis 105 c of the scope 105 and the central axis 109 c of the inspection target 109 coincide with each other, and the central axis 1203 c of the light emitting component 1203 is located immediately above the edge of the upper surface of the inspection target 109. As will be described later, it is desirable that the center axis 105c of the scope 105 substantially coincides with the center axis 109c of the inspection object 109, but the center axis 1203c of the light emitting component 1203 is directly above the edge of the upper surface of the inspection object 109. It does not necessarily have to be located in Positional errors can be tolerated without departing from the purpose of the present invention.

  In the present embodiment, in order to accurately inspect the edge of the upper surface of the inspection object 109, as in the case of the first embodiment, assuming that the radius and the irradiation angle of the light emitting component 1203 are c and 2α, respectively, It is desirable that the distal end 105s of the scope 105 and the distal end 1203s of the light emitting component 1203 are spaced apart from the inner bottom surface of the inspection body 108 by a distance X so as to satisfy the expressions 1 and 2.

  In order not to cause halation due to light interference between adjacent light emitting components 1203, preferably, the component inspection apparatus 1200 sequentially supplies power to each of the n light emitting components 1203 by the light emitting component power supply 1201. The light emitting parts 1203 are caused to emit light sequentially. Accordingly, the component inspection apparatus 1200 sequentially acquires image data of the upper edge of the inspection object 109 by the imaging apparatus 104. Then, by synthesizing the acquired n pieces of image data of the edge in the control device 101, one piece of image data of the edge can be acquired.

  Since the component inspection apparatus 1200 according to the present embodiment can reliably recognize the edge (contour) of the upper surface of the inspection object 109 inside the inspection object 108, it can inspect defects such as chipping and distortion of the assembled component. Further, the component inspection apparatus 100 according to the present embodiment does not insert a mirror by fitting to the inner and outer surfaces of a cylindrical object as in the technique of Patent Document 1, but an inspection mechanism (scope 105 and light emitting component 1203). Does not come into contact with the inner side surface of the inspection body 108, so that the surface is not damaged.

  In the component inspection apparatus 1200 according to the present embodiment, the central axis 105c of the scope 105 and the central axis 109c of the inspection object 109 do not need to be strictly matched, and the inspection speed and inspection accuracy are improved, and thus the manufacturing cost is reduced. Realized. In addition, the component inspection apparatus 1200 according to the present embodiment sequentially supplies power to each of the n light emitting components 1203 to cause the light emitting components 1203 to emit light sequentially. And since the component inspection apparatus 1200 acquires the image data of the illuminated said upper surface sequentially, and synthesize | combines image data after that, it can prevent halation.

DESCRIPTION OF SYMBOLS 100: Component inspection apparatus, 101: Control apparatus, 102: Illumination apparatus, 103: Optical fiber, 104: Imaging apparatus, 105: Scope, 106: Jig, 107: Output apparatus, 108: Inspection object, 109: Inspection object

Claims (10)

A cylindrical scope,
A light-emitting component fixed to the outer periphery of the scope;
A component inspection apparatus comprising: an imaging apparatus connected to the scope and configured to image an inspection object formed inside a cylindrical inspection object. A plurality of the light emitting components
The component inspection apparatus according to claim 1, wherein the light emitting component is caused to emit light sequentially, and image data of the inspection object is sequentially acquired by the imaging device. The light emitting component is fixed to the outer periphery of the scope so that the tip thereof is located on the same plane as the tip of the scope,
The inspection object is formed in a cylindrical or columnar shape on the inner bottom surface of the inspection object,
The scope and the light emitting component are inserted into the inspection body so that the distal ends of the scope and the light emitting component are separated from the inner bottom surface of the inspection body by a predetermined distance,
The predetermined distance includes the angle of view of the scope, the number of light emitting components, the radius and the irradiation angle, the height and radius of the inspection object, and the side surface of the inspection object on the inner bottom surface of the inspection object. The component inspection apparatus according to claim 1, wherein the component inspection apparatus is determined according to a distance to an inner surface of the inspection body. The predetermined distance is X, the angle of view of the scope is 2θ, the number of light-emitting components, the radius and the irradiation angle are n, c and 2α, respectively, the height and radius of the inspection object are Z and a, respectively, and When the distance from the side surface of the inspection object to the inner side surface of the inspection object on the inner bottom surface of the inspection object is Y, Equation 1:
The component inspection apparatus according to claim 3, wherein: The light emitting component is an optical fiber,
The component inspection apparatus according to claim 1, further comprising an illumination device that guides light to the optical fiber. A component inspection apparatus comprising: a cylindrical scope; a light-emitting component fixed to an outer periphery of the scope; and an imaging device connected to the scope and imaging an inspection object formed inside a cylindrical inspection object The steps to prepare,
A component inspection method comprising: inspecting the inspection object. The component inspection apparatus includes a plurality of the light emitting components,
The inspecting step includes
Inserting the scope and the light-emitting component into the inspection body such that the distal ends of the scope and the light-emitting component are separated from the inner bottom surface of the inspection body by a predetermined distance;
The component inspection method according to claim 6, further comprising: sequentially emitting light from the light-emitting component and sequentially acquiring image data of the inspection object by the imaging device. The light-emitting component is fixed to the outer periphery of the scope at equal intervals so that the tip is aligned in the same plane as the tip of the scope,
The inspection object is formed in a cylindrical or columnar shape on the inner bottom surface of the inspection object,
The predetermined distance includes the angle of view of the scope, the number of light emitting components, the radius and the irradiation angle, the height and radius of the inspection object, and the side surface of the inspection object on the inner bottom surface of the inspection object. The component inspection method according to claim 7, wherein the component inspection method is determined according to a distance to an inner surface of the inspection body. The predetermined distance is X, the angle of view of the scope is 2θ, the number of light-emitting components, the radius and the irradiation angle are n, c and 2α, respectively, the height and radius of the inspection object are Z and a, respectively, and When the distance from the side surface of the inspection object to the inner side surface of the inspection object on the inner bottom surface of the inspection object is Y, Equation 1:
The component inspection method according to claim 8, wherein: The light emitting component is an optical fiber,
The component inspection method according to claim 6, wherein the component inspection device further includes an illumination device that guides light to the optical fiber.