JP2006003322A - Lighting device and inspection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting device capable of emitting light cylindrically, and an inspection device using the same. <P>SOLUTION: This lighting device has a diffusion transmission plate 3 for transmitting diffusingly the emitted light from a light source 2, and a reflection member 4 having a conical reflecting face for reflecting the light diffused via the diffusion transmission plate 3 radially from the center axis. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an illumination device that uniformly emits light and an inspection device using the illumination device.

  As a method for inspecting defects appearing on the surface of an article, visual inspection has been mainly performed by an operator. However, the visual inspection is likely to cause variations by the inspector, and it is difficult to avoid overlooking small defects. Therefore, an illumination technique that can perform a more accurate inspection has been proposed. For example, in the technique described in Patent Literature 1, an inspection object having a cylindrical shape is uniformly illuminated using annular illumination.

JP 2003-232748 A

  However, in the technique described in Patent Document 1, when the inspection object having a cylindrical shape is formed of a transparent member that transmits light, the light irradiated from the outside of the inspection object passes through the inspection site, and thus the obtained object is obtained. The resulting image will appear as a portion of the outer peripheral surface on the opposite side.

  To solve this problem, it is conceivable to insert a light source into a cylindrical inspection site made of a transparent member and transmit light from the inside, but it is difficult to uniformly irradiate the inspection site uniformly.

  In view of such a problem, an object of the present invention is to provide an illumination device capable of irradiating light in a cylindrical shape and an inspection device using the illumination device.

  In order to solve the above-described problems, an illumination device according to the present invention includes at least one light source that emits light, a diffusion transmission plate that diffuses and transmits the light emitted from the light source, and the diffusion transmission plate. And a reflecting member having a conical reflecting surface for reflecting the diffused light radially from the central axis.

  Here, the conical reflection surface is preferably a diffusion reflection surface having a light diffusion function.

  In addition, an illumination device according to the present invention includes at least one light source that emits light, and a diffuse reflection member having a conical diffuse reflection surface that reflects and diffuses light from the light source radially from a central axis. It is characterized by that.

  The inspection apparatus according to the present invention is an inspection apparatus that inspects an inspection object having at least a part of a cylindrical shape that transmits light, and is inserted into an inspection site of the inspection object, and the inspection object An illumination device that transmits light from the inside to the outside of the cylindrical portion, a conical reflecting mirror having a frustoconical side surface-shaped reflecting surface on the inner surface side, and having a large-diameter opening and a small-diameter opening, and the conical surface And an image capturing means for capturing an image projected on the conical reflector as an image.

  The illuminating device according to the present invention has a conical surface that reflects light radially from the central axis, and thus can emit light emitted from the light source in a cylindrical shape.

  In addition, the conical surface is a diffuse reflection surface having a light diffusion function, so that the uniformity of illuminance can be improved.

  In addition, an inspection apparatus according to the present invention includes an illumination device that is inserted into an inspection site of an inspection object having a cylindrical shape that transmits light, and transmits light from the inside of the cylindrical portion of the inspection object to the outside, and a truncated cone A conical reflecting mirror having a side-shaped reflecting surface, and an image capturing means for capturing, as an image, an image of an inspection object arranged at an inspection position in the conical reflecting mirror, projected on the conical reflecting mirror. The inspection object having a cylindrical shape that transmits light can be accurately inspected.

  A lighting device shown as a specific example of the present invention has a planar light emitting portion that irradiates light in all surrounding directions. Hereinafter, specific embodiments will be described in detail with reference to the drawings. FIG. 1 is a side cross-sectional view showing a configuration of a lighting device 1 according to the present invention. The illuminating device 1 includes a light source 2, a diffusion transmission plate 3 that diffuses and transmits light emitted from the light source 2, and a conical shape that reflects light diffused through the diffusion transmission plate 3 radially from a central axis. And a reflecting member 4 having a reflecting surface. Moreover, it has the ventilation hole 5 for attracting | sucking and conveying the test target object 7, and the packing 6 for maintaining airtightness at the time of aspiration.

  The light source 2 is configured using, for example, an LED (Light Emitting Diode) or the like, and is arranged so that the optical axis thereof is parallel to the central axis of the lighting device 1 and has an equal circumferential angle on the circumference concentric with the central axis. Yes. For example, as shown in FIG. 2, the six LEDs are arranged in the housing 1 a so as to be equidistant with a circumferential angle of 60 ° on a concentric circumference centered on the vent hole 5. In addition, it is possible to use LED of various colors according to the test | inspection site | part and test | inspection content of the test target object 7 as LED.

  The diffuse transmission plate 3 diffuses light and uses the point light source of the light source 2 as a surface light source. This diffusion transmission plate 3 is a ring-shaped one as shown in FIG. 3, for example, as shown in FIG. It has the shape of For this reason, the diffuse transmission plate 3 is a surface light source having a ring-shaped light emitting surface. Further, the diffusing and transmitting plate 3 can be removed, and the diffusibility and permeability can be adjusted according to the light source 2 so that the illuminance is uniform.

  As shown in FIG. 4, the reflecting member 4 has a conical reflecting surface 4 a on the inner side with the vent 5 as an axis, and an opposing surface 4 b that is in airtight contact with the opening end of the inspection object 7. is doing. Here, it is desirable that the conical reflecting surface 4a sets the apex angle of the cone so that the illuminance of the reflected light is uniform and has a light diffusion function. Moreover, since the distance from the conical reflection surface 4a to the outer peripheral surface 4c becomes short as the reflecting member 4 leaves | separates from the light source 2, the illumination intensity of light equalizes and is irradiated cylindrically.

  In addition, it is desirable that the reflecting member 4 is formed of a transparent member that has, for example, a cylindrical shape and transmits light. For the transparent member, for example, methacrylic resin (PMMA: Poly Methyl Methacrylate) or epoxy resin is used which has high transparency. Here, the conical reflecting surface 4a and the opposing surface 4b are subjected to white coating for reflecting light, and the cylindrical outer peripheral surface 4c is subjected to sand blasting for matting. Thereby, the light incident from the top surface 4d of the reflecting member 4 is reflected by the conical reflecting surface 4a in the direction of the cylindrical outer peripheral surface 4c, and is irradiated radially from the central axis of the cone. Further, by performing sandblasting on the cylindrical outer peripheral surface 4c, it is possible to improve the uniformity of illuminance and prevent light reflected by the inner surface of the inspection object 7 from being reflected again by the outer peripheral surface 4c. Accordingly, the illumination device 1 can clearly display the outer peripheral surface of the inspection object 7 that transmits light.

  A packing 6 for sealing the opening end of the inspection object 7 is provided on the facing surface 4b. For this packing 6, for example, silicon rubber (SR) having excellent wear resistance and mechanical strength is used.

  The reflecting member 4 is preferably designed according to the shape of the inspection object 4. For example, when the inspection region of the inspection object 7 has a cylindrical shape, the reflecting member 4 has a cylindrical outer peripheral surface 4c having a diameter smaller than the diameter of the opening end portion of the inspection object 7, and It is preferable to have a conical reflecting surface 4a having a height corresponding to the length.

  The vent 5 is for sucking and fixing the inspection object 7 and is provided on the central axis of the lighting device 1. The inspection object 7 is fixed when the opposed surface 4 b of the reflecting member 4 and the opening end of the inspection object 7 are in contact with each other and are sucked using the vent 5. Examples of the inspection object 7 fixed in this way include a so-called PET (Polyethylene Terephthalate) bottle.

  Returning to FIG. 1, the optical path of the illumination device 1 will be described. The light from the point light source emitted from the light source 2 arranged so as to have an equal circumferential angle on the concentric circumference centered on the vent hole 5 is diffused by the diffuse transmission plate 3 and has a ring-shaped light emitting surface. Of light. The light scattered by the diffuse transmission plate 3 passes through the top surface 4d of the reflection member 4, is reflected by the conical reflection surface 4a, and is irradiated radially from the central axis of the cone. Here, a white coating for reflecting light is applied to the facing surface 4 b of the reflecting member 4, and a packing 6 for sealing the opening end of the inspection object 7 is provided. Therefore, there is almost no light parallel to the central axis of the cone, and the light radially reflected by the conical reflecting surface 4a is uniformly irradiated through the cylindrical outer peripheral surface 4c.

  The suction function of the lighting device 1 will be described. The vent 5 provided on the central axis of the lighting device 1 is formed of, for example, a pipe, and the tap of the pipe is connected to a suction pump. Then, the inspection object 7 is fixed to the lighting device 1 by sucking the opening end of the inspection object 7 and the facing surface 4b of the reflecting member 4 in an airtight manner using the packing 6.

  As described above, the illuminating device 1 according to the present invention reflects the diffused transmission plate 3 that diffuses and transmits the light emitted from the light source 2 and the light diffused through the diffusion transmission plate 3 radially from the central axis. By having the conical reflection surface 4a, it can be approximated to a cylindrical light source.

  In addition, the illuminating device 1 shown in FIG. 1 includes the diffusing and transmitting plate 3 that diffuses and transmits the light emitted from the light source 2, but the conical reflecting surface 4 a of the reflecting member 4 is projected from the light source 2. A conical diffuse reflection surface that reflects the diffused light while diffusing it may be used, and the diffuser transmission plate 3 may not be provided. That is, since the light emitted from the light source 2 is diffused and reflected by the conical diffuse reflection surface, the light can be uniformly irradiated in all directions of 360 ° as in the illumination device 1 shown in FIG.

  Next, application examples of the lighting device 1 according to the present invention will be described with reference to FIGS. FIG. 5 is a block diagram showing a configuration of an inspection apparatus 50 to which the illumination apparatus 1 according to the present invention is applied. The inspection apparatus 50 inspects for defects by transmitting light from the inside of the inspection object 7 having a cylindrical shape that transmits light using the illumination apparatus 1 to the outside. In addition, although demonstrated using the raw material before shaping | molding of what is called a PET bottle as the test target object 7, it is not limited to this.

  An inspection apparatus 50 shown in FIG. 5 includes a lighting apparatus 1 that is inserted into an inspection site of an inspection object 7 having a cylindrical shape that transmits light and transmits light from the inside of the inspection object 7 to the outside, and a truncated cone side surface shape. A conical reflecting mirror 51 having a large-diameter opening and a small-diameter opening, and an optical path for changing the path of the light reflected by the conical reflecting mirror 51 to the image capturing means 53 The change reflecting mirror member 52, the image capturing means 53 for capturing the image projected on the conical reflecting mirror 51 as the inspection object 7 arranged at the inspection position in the conical reflecting mirror 51, and the captured image The image processing means 54 for processing the image, the image display device 55 for displaying the image, and the transport means 56 for transporting the inspection object 7 to the inspection position in the conical reflector 51 are configured. .

  Next, each configuration of the inspection apparatus 50 will be described. In this application example, the inspection part is the mouth part of the cap mechanism in which the thread of the PET bottle is formed, and the light that transmits light from the inside to the outside of the PET bottle mouth part is used. It is for inspecting dirt. According to such an inspection method, it is possible to perform an inspection with less noticeable shadows such as screw threads and engraved characters than a method of transmitting light from the outside to the inside of the PET bottle mouth.

  The illuminating device 1 has a configuration as described with reference to FIGS. 1 to 4 and irradiates light uniformly from the inside to the outside of the PET bottle mouth. That is, the illuminating device 1 includes a light source 2, a diffusion transmission plate 3 that diffuses and transmits light emitted from the light source 2, and a cone that radially reflects light diffused through the diffusion transmission plate from the central axis. The reflecting member 4 having a reflective surface, the vent 5 for sucking and transporting the inspection object 7, and the packing 6 for maintaining airtightness when sucked.

  As shown in FIG. 6A, the conical reflecting mirror 51 is formed by cutting a cone whose apex angle is 90 ° with a plane parallel to the bottom surface, and a three-dimensional curved surface excluding the portion including the apex. 51a. That is, the angle of the reflecting surface 51 a of the conical reflecting mirror 51 is set to 45 ° with respect to the bottom surface, and the inspection center position exists on the central axis of the conical reflecting mirror 51. Moreover, it is preferable that the central axis of the conical reflector 51 and the central axis of the illuminating device 1 are parallel and collinear. When viewed from the bottom side of the cone, the conical reflecting mirror 51 having such a structure has a ring-shaped reflecting surface 51a composed of a large-diameter opening and a small-diameter opening as shown in FIG. 6 (b). The PET bottle mouth is projected on the ring-shaped reflecting surface 51a.

  As shown in FIG. 7A, the optical path changing reflector member 52 has a through hole 52a through which the inspection object 7 is inserted. The through hole 52a is inserted in the inspection object 7 and the image capturing direction. It is formed so that it can be opened with a drill or the like. In other words, the side surface 52c of the through hole 52a of the optical path changing reflector member 52 installed at an angle of 45 ° is not visible from the insertion direction of the inspection object 7 and the image capturing direction. FIG. 7B is a view as seen from the side opposite to the reflecting surface 52 b of the optical path changing reflector member 52. The inner surface 52c of the through hole 52a schematically shown in FIG. 7B is treated with a matte black paint or the like to prevent irregular reflection. By such an optical path changing reflecting mirror member 52, an image of the ring-shaped inspection site projected on the conical reflecting mirror 51 is sent to the image capturing means 53.

  The image capturing unit 53 includes a CCD (Charge Coupled Device) camera, and captures an image of the examination site displayed on the optical path changing reflector member 52 as an image. The captured image is output to the image processing means 54 and subjected to image processing so that a defect defect of the inspection object 7 can be determined.

  The image processing means 54 is constituted by, for example, a personal computer capable of storing and calculating. Since the image of the outer peripheral surface of the inspection object 7 captured by the image capturing means 53 is ring-shaped and is deformed compared to the image when the inspection object 7 is observed from the side, the image processing means 54 Image processing is performed, and the outer peripheral surface of the inspection object 7 is converted into an image showing a developed state and displayed on the image display device 55. The area of the defect shown on the display image is proportional to the area of the actual defect, and the defect can be evaluated visually. Further, it is desirable that the image processing unit 54 has a correcting unit that corrects when the insertion position of the inspection object 7 is shifted.

  Returning to FIG. 5, the optical path in the inspection apparatus 50 will be described. The illuminating device 1 inserted into the mouth of the PET bottle that is the inspection object 7 irradiates light from the reflecting member 4 in all the surrounding directions, and transmits the light from the inside of the PET bottle mouth to the outside. The light transmitted through the PET bottle mouth reaches the reflecting surface 51a of the conical reflecting mirror 51, and displays an image of the PET bottle mouth in a ring shape. Since the reflecting surface 51a of the conical reflecting mirror 51 has an angle of 45 ° with respect to the axis through which the material before molding of the PET bottle is inserted, the light reflected by the reflecting surface 51a is the PET bottle. Reaches the reflecting surface 52a of the optical path changing reflector member 52 in parallel with the axis through which the material before molding is inserted. Therefore, the mirror image of the ring-shaped image projected on the conical reflector 51 is displayed on the optical path changing reflector member 52. The image capturing means 53 captures a ring-shaped image projected on the optical path changing reflector member 52 as an image. Since the optical path changing reflector member 52 is installed at an angle of 45 ° with respect to the axis through which the material before molding of the PET bottle is inserted, the optical axis incident on the image capturing means 53 is before the PET bottle is molded. The angle is 90 ° with respect to the axis through which the material is inserted.

  In this way, the illumination device 1 that irradiates light in all directions around the PET bottle mouth that is the inspection object 7 is inserted, and light is transmitted from the inside of the PET bottle mouth to the outside so that the PET bottle mouth By projecting the outer peripheral surface onto the conical reflector 51, it is possible to clearly capture the outer peripheral surface of the PET bottle mouth portion where the image on the opposite side of the examination site is superimposed when light is irradiated from the outside. . In addition, when irradiating light from the outside, threads and stamped characters are conspicuous, and it was very difficult to find black spots that are defective defects, but by irradiating light from the inside close to the inspection site As a result, the screw thread becomes inconspicuous, and defect inspection can be performed with high accuracy. In the conventional inspection method, since light was irradiated from the outer surface side with unevenness such as a screw thread of a PET bottle, shadows were generated due to irregular reflection or refraction of light due to the unevenness, but according to the inspection method of this application example For example, since the light with uniform illuminance from the illuminating device 1 is transmitted from the inner surface without unevenness, it is possible to prevent shadows caused by the unevenness on the outer surface side.

  Next, the conveyance means 56 which conveys the raw material before shaping | molding of the PET bottle which is the test object 7 is demonstrated with reference to FIG. The illumination device 1 of the inspection device 50 is provided with a vent 5 for sucking and transporting the material before molding of the PET bottle, and the material before molding of the PET bottle sucked by the illumination device 1 is conical. By inserting through the small-diameter opening of the planar reflecting mirror 51, the defect defect is inspected. It is desirable that the transport unit 56 controls the plurality of lighting devices 1 in order to continuously inspect the material before molding the PET bottle.

  First, the conveying means 56 sucks the material before molding the PET bottle with the illumination device 1 outside the casing of the inspection device 50, and conveys the material before molding the PET bottle to the central axis of the conical reflector 51. (Step S1). Then, the material before molding of the transported PET bottle is inserted along the central axis of the conical reflector 51 so that the inspection part of the PET bottle becomes the inspection position of the conical reflector 51 (step S2). . The image capturing means 53 captures an image of the inspection portion of the PET bottle inserted into the inspection position of the conical reflector 51. When the image is captured and the inspection is completed, the conveying means 56 pulls up the material before molding of the PET bottle sucked into the illumination device 1 from the casing of the inspection device 50 along the central axis of the conical reflector 51 ( Step S3), moving from the central axis of the conical reflector 51. And the conveyance means 56 conveys the raw material before shaping | molding of a new PET bottle to the central axis of the cone-shaped reflective mirror 51 (step S1), and repeats the process of step S2 to step S4.

  Thus, the inspection can be continuously performed by sucking and fixing the material before molding the PET bottle to the lighting device 1 and transporting it. In step S3, the material before molding of the PET bottle is pulled up from the casing of the inspection apparatus 50 along the central axis of the conical reflector 51. Here, suction of the material before molding of the PET bottle is performed. The inspection may be terminated by dropping the raw material before molding the PET bottle into the through hole 52a of the optical path changing reflector member 52. In addition, you may make it convey the raw material before shaping | molding of a PET bottle to the conical reflective mirror 51, and to convey. In this case, the illumination device 1 may be inserted into the PET bottle mouth that has been transported.

  9 and 10 show another configuration of the inspection apparatus to which the illumination device 1 according to the present invention is applied. 9 and 10 is the same as the specific example of the inspection apparatus 50 described with reference to FIGS. 5 to 8 above, and therefore, the same parts are denoted by the same reference numerals. Is omitted.

  An inspection apparatus 90 shown in FIG. 9 is inserted into an inspection site of an inspection object 7 having a cylindrical shape that transmits light, and transmits the light from the inside of the inspection object 7 to the outside. A conical reflecting mirror 51 having a reflecting surface on the inner surface side and having a large-diameter opening and a small-diameter opening, and an optical path change for changing the path of light reflected by the conical reflecting mirror 51 to the image capturing means 53 Reflecting mirror member 52, image capturing means 53 for capturing an image of inspection object 7 arranged at the inspection position in conical reflecting mirror 51, projected on conical reflecting mirror 51, and the captured image The image processing means 54 for processing the image, the image display device 55 for displaying the image, and the transport means 56 for transporting the inspection object 7 to the inspection position in the conical reflector 51 are configured.

  Here, the distance between the conical reflector 51 and the optical path changing reflector member 52 is longer than the length of the inspection object 7. That is, since the distance between the conical reflector 51 and the optical path changing reflector member 52 is shorter than the length of the inspection object 7, the inspection apparatus 50 shown in FIG. 9, the inspection device 90 shown in FIG. 9 has a sufficient distance between the conical reflecting mirror 51 and the optical path changing reflector member 91, and therefore the optical path changing reflector member. No through hole 52 a is required for 91. Further, in the inspection apparatus 50 shown in FIG. 5, when the image capturing means 53 captures the ring-shaped image projected on the optical path changing reflector member 52, the inspection object 7 itself prevents the ring-shaped image from being captured. However, in the inspection apparatus 90 shown in FIG. 9, the inspection object 7 does not hinder imaging, and the image capturing means 53 images the entire outer peripheral surface of the ring-shaped inspection object 7 without missing. Can do.

  An inspection apparatus 100 shown in FIG. 10 is inserted into an inspection part of an inspection object 7 having a cylindrical shape that transmits light, and transmits light from the inside of the inspection object 7 to the outside. A conical reflecting mirror 51 having a reflecting surface on the inner surface side and having a large-diameter opening and a small-diameter opening, and an inspection object 7 arranged at an inspection position in the conical reflecting mirror 51 are conically reflecting. An image capturing unit 53 that captures an image projected on the mirror 51 as an image, an image processing unit 54 that processes the captured image, an image display device 55 that displays the image, and a conical reflector And a transporting means 56 for transporting to an inspection position in 51.

  That is, the inspection apparatus 100 shown in FIG. 10 does not have the optical path changing reflecting mirror members 52 and 91, and is configured to capture the image projected on the conical reflecting mirror 51 as it is by the image capturing means 53. Yes.

  The optical path in this inspection apparatus 100 will be described. The illuminating device 1 inserted into the mouth of the PET bottle that is the inspection object 7 irradiates light in all directions from the reflecting member 23 and transmits light from the inside of the material before molding of the PET bottle to the outside. Let The light transmitted through the PET bottle mouth reaches the reflecting surface 51a of the conical reflecting mirror 51, and displays an image of the PET bottle mouth in a ring shape. Since the reflecting surface 51a of the conical reflecting mirror 51 has an angle of 45 ° with respect to the axis through which the material before molding of the PET bottle is inserted, the light reflected by the reflecting surface 51a is the PET bottle. Reaches the image capturing means 53 in parallel with the axis through which the material before molding is inserted. The image capturing means 53 captures a ring-shaped image projected on the conical reflecting mirror 51 as an image.

  According to the inspection apparatuses 50, 90, and 100 as described above, the illumination device 1 is inserted into the inspection site of the inspection object 7 having a cylindrical shape that transmits light, and light is transmitted from the inside of the inspection object 7 to the outside. Is transmitted, and the image of the inspection object 7 arranged at the inspection position in the conical reflector 51 is projected on the conical reflector 51, whereby a clear image of the outer peripheral surface of the inspection object 7 is obtained. Can do.

  In the application example described above, the outer peripheral surface of the inspection object 7 is imaged by the image capturing means 53 using the conical reflector 51, but a line scan camera that is a one-line (one-dimensional) image sensor. An image may be created by moving the inspection object 7 by using.

  As shown in FIG. 11, an inspection apparatus 110 using this line scan camera is inserted into an inspection site of an inspection object 7 having a cylindrical shape that transmits light, and transmits light from the inside of the inspection object 7 to the outside. Illumination apparatus 1, image capture means 111 that captures an image as a line field, image processing means 54 that processes the captured image, image display apparatus 55 that displays the image, and rotation drive means 112 that rotates the illumination apparatus 1 And is configured.

  The image capturing unit 111 includes a line scan camera and can capture the outer peripheral surface of the inspection object 7 as an image by moving the inspection object 7 in a direction perpendicular to the CCD array.

  The rotation driving means 112 rotates the illumination device 1 in a direction perpendicular to the CCD row of the line scan camera. That is, since the inspection object 7 sucked by the illumination device 1 rotates together with the illumination device 1, the outer peripheral surface is imaged by the line scan camera.

  In this way, the illumination device 1 is inserted into the inspection site of the inspection object 7 having a cylindrical shape that transmits light, and the inspection object 7 is rotated in a direction perpendicular to the CCD row of the line scan camera. By capturing light transmitted from the inside to the outside with a line scan camera, an image of the outer peripheral surface of the inspection object 7 can be obtained.

  In the application example using this line scan camera, the illumination device 1 may irradiate only the image capturing means 111 side that is the imaging position. That is, the light source 2 may emit light only on the image capturing means 111 side.

It is side surface sectional drawing which shows the structure of the illuminating device which concerns on this invention. It is a schematic diagram which shows an example of a light source. It is a schematic diagram which shows an example of a diffuse transmission board. It is a schematic diagram which shows an example of a reflection member. It is a block diagram which shows the structure of the test | inspection apparatus to which this invention is applied. It is a figure for demonstrating a conical reflector. It is a figure for demonstrating an optical path change reflective mirror member. It is a figure for demonstrating operation | movement of a conveyance means. It is a block diagram which shows the other structure of the test | inspection apparatus to which this invention is applied. It is a block diagram which shows the other structure of the test | inspection apparatus to which this invention is applied. It is a block diagram which shows the other structure of the test | inspection apparatus to which this invention is applied.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Illuminating device, 2 Light source, 3 Diffusing and transmitting plate, 4 Reflecting member, 5 Vent, 6 Packing, 7 Inspection object, 50 Inspection apparatus, 51 Conical surface reflecting mirror, 52 Optical path change reflecting mirror member, 53 Image capturing means 54 image processing means, 55 image display apparatus, 56 transport means, 90 inspection apparatus, 91 optical path changing reflector member, 100 inspection apparatus, 110 inspection apparatus, 111 image capturing means, 112 rotation driving means

Claims (18)

At least one light source that emits light;
A diffusion transmission plate that transmits the light emitted from the light source while diffusing;
And a reflecting member having a conical reflecting surface that radially reflects light diffused through the diffusing and transmitting plate from a central axis.   The lighting device according to claim 1, wherein the conical reflection surface is a diffusion reflection surface having a light diffusion function.   The lighting device according to claim 1, wherein the light source includes a plurality of LEDs arranged in a circumferential shape around a central axis. The reflective member is made of a cylindrical transparent material having a conical inner surface on the inside,
2. The lighting device according to claim 1, wherein a white paint having a light diffusion function and / or a light reflection function is applied to the conical inner surface.   The lighting device according to claim 1, further comprising a vent for sucking an inspection object on the central axis.   The lighting device according to claim 1, wherein the reflecting member has a facing surface that is in airtight contact with the opening end of the inspection object. At least one light source that emits light;
A diffusing reflection member having a conical diffusive reflecting surface for reflecting light from the light source while diffusing radially from a central axis. An inspection apparatus for inspecting an inspection object having at least a part of a cylindrical shape that transmits light,
An illumination device that is inserted into an inspection site of the inspection object and transmits light from the inside of the cylindrical portion of the inspection object to the outside;
A conical reflecting mirror having a frustoconical side surface reflecting surface on the inner surface side and having a large-diameter opening and a small-diameter opening;
An inspection apparatus comprising: an image capturing means for capturing, as an image, an image of an inspection object placed at an inspection position in the conical reflecting mirror, which is projected on the conical reflecting mirror. The lighting device is
At least one light source that emits light;
A diffusion transmission plate that transmits the light emitted from the light source while diffusing;
The inspection apparatus according to claim 8, further comprising: a reflection member having a conical reflection surface that radially reflects light diffused through the diffusion transmission plate from a central axis.   The inspection apparatus according to claim 9, wherein the conical reflection surface is a diffusion reflection surface having a light diffusion function.   The inspection apparatus according to claim 9, wherein the lighting device includes a vent for sucking the inspection object.   The inspection apparatus according to claim 9, wherein the illumination device has a facing surface that is in airtight contact with the opening end of the inspection object.   The inspection apparatus according to claim 11, further comprising a conveying unit that sucks the inspection object with the illumination device and conveys the inspection object to an inspection position in the conical reflecting mirror.   9. The inspection apparatus according to claim 8, wherein the image capturing means is arranged at an external position on the large diameter opening side of the conical reflector.   The conical surface serving as the reflective surface of the conical reflector has an inclination of 45 ° with respect to a plane perpendicular to the central axis of the cone, and the inspection position is on the central axis of the conical reflector. The inspection apparatus according to claim 8.   9. The inspection apparatus according to claim 8, further comprising an optical path changing reflector member that changes a path of light reflected by the conical reflector to the image capturing means.   The inspection apparatus according to claim 16, wherein a through-hole for inserting the inspection object is provided in a central portion of the optical path changing reflector member.   18. The inspection apparatus according to claim 17, wherein a side surface of the through hole is parallel to the incident light and the reflected light, and is applied with a matte black paint.

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