JP4670375B2 - Imaging device - Google Patents

Description

  The present invention relates to an imaging apparatus used when an object is imaged in an electronic component mounting apparatus, an appearance inspection apparatus, or the like.

In a component mounting apparatus that mounts a component such as a semiconductor element on a substrate, an imaging device for optically recognizing the substrate or the component is used. This imaging device includes a camera for capturing an image of a substrate or a semiconductor element, and an illumination device that irradiates an object with illumination light when the image is captured (see, for example, Patent Document 1). In the example shown in this patent document, a light emitting diode (hereinafter abbreviated as “LED”) is adopted as a light source, and the lighting device is mounted in the form of an LED substrate in which a plurality of LEDs are arranged on a substrate.
Japanese Patent Laid-Open No. 10-208017

  By the way, LED used as a light source has a service life, and it is necessary to replace | exchange light source parts regularly in an illuminating device. However, it is difficult to easily replace the LED in the above-described illumination device, and it is not easy to reproduce the illumination light irradiation direction after attaching a new LED, and there is a difficulty in maintainability.

  Therefore, an object of the present invention is to provide an imaging device that can easily replace an LED used as a light source of an illumination device and has excellent maintainability.

An imaging apparatus according to the present invention is an imaging apparatus that captures an image of an object while irradiating the object with light, and an illumination direction that forms a predetermined angle with respect to an imaging direction of the camera and the imaging direction of the camera An illumination device that irradiates the object with light, and the illumination device is connected to a housing unit of an imaging optical system of the camera and has a substantially rectangular box-shaped housing opened on the object side; An imaging opening provided on the connection side of the housing with the camera corresponding to the imaging range of the camera, and an inner surface side of the housing formed in a direction orthogonal to or parallel to the imaging direction A reference plane, a plurality of LED substrates that are arranged at 90 ° equidistant positions in axial symmetry with respect to the imaging optical axis of the camera, and a plurality of LED light sources arranged in a substantially planar manner, and the LED light source is arranged on the LED substrate Not back An LED holding member that is held apart from the side through a shaft member, a mounting surface that is formed on the LED holding member and that comes into contact with the reference surface, and the housing that does not interfere with the imaging range of the LED holding member A light diffusing plate that is held by the LED holding member and diffuses light from the LED light source in a state that is substantially parallel to the LED substrate and does not overlap the imaging range, The direction of light emitted from the LED light source is made to coincide with the illumination direction by bringing the mounting surface into close contact with the reference surface.

The imaging apparatus of the present invention is an imaging apparatus for imaging the object while irradiating light to the object, a camera for imaging the object, the illumination forming a predetermined angle with respect to the imaging direction of the camera An illumination device that irradiates light onto the object from a direction, and the illumination device is connected to a housing unit of an imaging optical system of the camera and has a substantially rectangular box-shaped housing that is open on the object side; An imaging opening provided on the connection side of the housing with the camera corresponding to the imaging range of the camera, and an inner surface side of the housing in a direction orthogonal to or parallel to the imaging direction The LED light source includes the formed reference plane, a plurality of LED substrates arranged in an equidistant position at an angle of 90 degrees with respect to the imaging optical axis of the camera, and a plurality of LED light sources arranged in a substantially planar manner. Arrayed surface An LED holding member that holds the LED holding member in a separated state via a shaft member, a mounting surface that is formed on a coupling member to which the LED holding member is coupled and that contacts the reference surface, and the LED holding member does not interfere with the imaging range A fixing means for detachably fixing to the housing in a state, a light diffusion plate that is held by the LED holding member in a state that is substantially parallel to the LED substrate and does not overlap the imaging range, and diffuses light from the LED light source; The direction of the light emitted from the LED light source is made to coincide with the illumination direction by bringing the mounting surface into close contact with the reference surface.

  According to the present invention, in the mounting method of the LED substrate, the mounting surface provided on the LED holding member that holds the LED substrate and is detachably mounted on the housing is in close contact with the reference surface provided on the housing. Thus, by configuring the direction of the light emitted from the LED light source so as to match the illumination direction with good reproducibility, it is possible to easily replace the LED and realize an imaging device with excellent maintainability.

(Embodiment 1)
1 is a block diagram showing a configuration of an imaging apparatus according to Embodiment 1 of the present invention, FIG. 2 is a side cross-sectional view of the illumination apparatus according to Embodiment 1 of the present invention, and FIG. 3 is an illumination apparatus according to Embodiment 1 of the present invention. FIG. 4 is a bottom view of the lighting device according to the first embodiment of the present invention, FIG. 5 is an exploded perspective view of the lighting device according to the first embodiment of the present invention, and FIG. It is a partial exploded sectional view of the illuminating device of Embodiment 1.

  First, the configuration of the imaging apparatus will be described with reference to FIG. In FIG. 1, a substrate 2 such as a resin substrate, a ceramic substrate, or a wafer that is an object to be imaged is held on a substrate holder 1, and electronic components (not shown) are mounted on the substrate 2. An imaging unit 3 is disposed above the substrate holding unit 1. The image pickup unit 3 includes a camera 4 for picking up an image of the substrate 2 and an image pickup optical system 5 on which a lighting device is mounted. At the time of imaging for inspection, the substrate 2 is imaged by the camera 4 while irradiating the illumination light to the substrate 2 by the first illumination device 6 and the second illumination device 7 each having an LED light source. .

  The illumination light emitted from the first illumination device 6 is reflected by the half mirror 5a and applied to the surface of the substrate 2 from above. The illumination light emitted from the first illumination device 7 is emitted obliquely from above to the surface of the substrate 2. The first illumination device 6 and the second illumination device 7 are turned on by the illumination drive unit 9, and the illumination drive unit 9 is controlled by the illumination control unit 11. Image data obtained by imaging is sent to the image processing unit 8, where predetermined image processing is executed. Then, the image processing result is sent to the inspection processing unit 10, and the inspection processing unit 10 executes an inspection process for predetermined items such as a mounting state and a soldering state of the electronic component based on the image processing result.

  The control unit 12 controls the inspection processing unit 10 and the illumination control unit 11. The display unit 13 is a display device, and displays an image captured by the camera 4, a processed image by the image processing unit 8, and a guidance image at the time of operation input. The operation / input unit 14 is an input unit such as a keyboard, a mouse, or a touch panel, and inputs operation commands and data during inspection work.

  Next, the structure of the second illumination device 7 that illuminates the substrate 2 from obliquely above will be described with reference to FIGS. In FIG. 2, the imaging optical system 5 has a hollow housing portion, and a housing 20 constituting the outer shape of the second illumination device 7 is connected to the lower end portion of the housing portion. The housing 20 has a substantially rectangular box shape with the substrate 2 side to be imaged open, and an imaging range by the camera 4 is provided on the upper surface side of the housing 20, that is, on the connection side with the imaging optical system 5. An imaging opening 20c having a size corresponding to the above is provided. The plane portion 20a is orthogonal to the imaging direction of the camera 4, that is, the imaging optical axis A of the camera 4, and the side surface portion 20b of the housing 20 is parallel to the imaging optical axis A.

  An LED substrate 24 in which LED light sources 26 are arranged in a substantially flat shape on one side is mounted inside the housing 20 via an LED holding member 22. As shown in FIG. 3, a plurality of LED light sources 26 are densely arranged in a staggered pattern on the LED substrate 24, and in this state, illumination light emitted from the LED light sources 26 is captured in an imaging direction by the camera 4. That is, the substrate 2 is irradiated at a predetermined angle α with respect to the imaging optical axis A of the camera 4. A light diffusion plate 27 is disposed on the light source surface side of the LED substrate 24 so as to cover the front surface of the LED light source 26 and is held by the LED holding member 22, and diffuses light from the LED light source 26 to the substrate 2. On the other hand, it is irradiated uniformly.

  FIG. 4 shows the arrangement in the housing 20 when the second lighting device 7 is viewed from the lower surface side. The light diffusion plate 27 and the LED substrate 24 surround the substantially square-shaped imaging opening 20c from the periphery. They are arranged and are respectively held by the LED holding members 22 and attached to the housing 20. Here, four sets of the LED substrate 24 and the light diffusing plate 27 are arranged at 90 ° equidistant positions with respect to the imaging optical axis A so as to illuminate the imaging target as uniformly as possible from the surroundings. It is supposed to be. In FIG. 4, the LED substrate 24 is hidden by the light diffusion plate 27 and does not appear in the figure.

  Next, the structure of the LED holding member 22 and the method of mounting the LED substrate 24 on the housing 20 will be described with reference to FIGS. 5 shows an upside down state in which the upside down position is reversed with respect to the posture in the use state, and FIG. 6 shows that the LED holding member 22 to which the LED board 24 and the light diffusion plate 27 are attached is attached to the housing 20. It shows the state when you do.

  The LED holding member 22 is manufactured by cutting a plate material into a predetermined shape and then bending it, and has a five-surface shape having five different surfaces in the bending section. Hereinafter, the cross-sectional shape of the LED holding member 22 will be described with reference to FIG. The flat surface portion 22a made of a horizontal surface is positioned on the lower surface side in the normal rotation posture. An extending portion 22b provided extending rightward and upward from the flat surface portion 22a is a mounting surface for mounting the light diffusing plate 27, and the extending portion 22b is provided with a screw hole 22c.

The side surface portion 22d that extends vertically upward continuously from the flat surface portion 22a is a first fixing portion that attaches and fixes the LED holding member 22 to the inner surface of the housing 20, and the side surface portion 22d has a screw hole. 22e is provided. Then, the slope portion 22f that is bent and extended to the upper right by an angle of (90 ° −α) continues to the upper portion of the side face portion 22d, and serves as a substrate holding surface that holds the LED substrate 24. A screw hole 22g is provided in 22f. Here, the above-described extending portion 22b is provided in parallel with the inclined surface portion 22f. Furthermore, the extended portion 22h extending in the right horizontal direction from the inclined surface portion 22f is a second fixed portion that attaches and fixes the LED holding member 22 to the inner surface of the housing 20, and the extended portion 22h includes a screw. A hole 22i is provided.

  When the LED board 24 is attached to the LED holding member 22, as shown in FIG. 5, the bolt 25 is inserted through the attachment hole 24a provided in the LED board 24 and the shaft hole of the hollow shaft member 23 in order. In a state where the LED substrate 24 is separated from the inclined surface portion 22f by the member 23, the LED substrate 24 is screwed into the screw hole 22g and fastened. Thereafter, a light diffusion plate 27 having a function of diffusing light from the LED light source 26 is attached. That is, the bolt 28 is inserted into the mounting hole 27a provided in the light diffusion plate 27, and is screwed into the screw hole 22c provided in the extending portion 22b to be fastened. In the above configuration, the LED holding member 22 is configured to hold the LED substrate 24 in a separated state via the shaft member 23 from the back side where the LED light sources 26 are not arranged.

  Further, when the light diffusing plate 27 is attached, the extending portion 22b is provided in parallel with the inclined surface portion 22f and at a position where the light diffusing plate 27 does not protrude from the imaging opening 20c. Is held by the LED holding member 22 in a state of being substantially parallel to the LED substrate 24 and not overlapping the imaging range of the camera 4. The side end portion 27b of the light diffusing plate 27 is cut in a tapered shape as shown in FIG. 4 so that adjacent light diffusing plates 27 do not interfere with each other in the radiation arrangement of the light diffusing plate 27 shown in FIG. It has become.

  Then, the LED holding member 22 to which the LED substrate 24 and the light diffusing plate 27 are attached in this manner is attached to the housing 20 as shown in FIG. The inner surface of the side surface portion 20b, which is the first fixing portion in the housing 20, serves as a reference for fixing the side surface portion 22d, and is a first reference surface D provided in a direction parallel to the imaging direction. The lower surface of the flat surface portion 20a, which is a portion, serves as a reference for fixing the extending portion 22h, and serves as a second reference surface E provided in a direction orthogonal to the imaging direction. That is, the first reference plane D and the second reference plane E are a pair of reference planes that are orthogonal to each other and are formed on the inner surface side of the housing 20 in a direction orthogonal to the imaging direction and in a parallel direction. .

  When the LED holding member 22 is mounted on the housing 20, the outer surface of the side surface portion 22d, that is, the first mounting surface B on the first reference surface D, and the upper surface of the extending portion 22h on the second reference surface E, That is, the second mounting surfaces C abut each other. Then, the bolt 29 is inserted through the mounting hole 20e and screwed into the screw hole 22e and fastened, and the bolt 30 is inserted through the mounting hole 20d and screwed into the screw hole 22i and fastened. As a result, the first reference surface D is in close contact with the first mounting surface B, and the second reference surface E is in close contact with the second mounting surface C, and the LED holding member 22 has the first fixing portion and the second fixing portion described above. Via the housing 20.

  In this state, as shown in FIGS. 2 and 4, the LED holding member 22 is located outside the imaging opening 20 c and does not interfere with the imaging range of the camera 4. That is, the bolts 29 and 30 are fixing means for detachably fixing the LED holding member 22 to the housing 20 in a state that does not interfere with the imaging range. Further, the first mounting surface B on the outer surface of the side surface portion 22d and the second mounting surface C on the upper surface of the extending portion 22h are formed orthogonal to each other with the shaft member 23 interposed between the LED holding member 22 and the pair of the above-described pairs. It is a pair of mounting surfaces that come into contact with the reference surface.

  Then, the LED holding member 22 is screwed to the housing 20 in a state in which the pair of mounting surfaces are in close contact with a pair of reference surfaces provided on the inner surface side of the housing 20. 2 is fixed in the posture shown in FIG. 2, whereby the direction of the light emitted from the LED light source 26 is set to the intended illumination direction, that is, the illumination direction set to form a predetermined angle α with the imaging direction by the camera 4. Can be matched.

(Embodiment 2)
FIG. 7 is a side cross-sectional view of the lighting device according to the second embodiment of the present invention, FIG. 8 is an explanatory view of the mounting state of the LED board in the lighting device according to the second embodiment of the present invention, and FIG. 9 is a second embodiment of the present invention. FIG. 10 is a partially exploded sectional view of the lighting device according to the second embodiment of the present invention.

  The second illumination device 107 shown in the second embodiment has the same outer shape / function and mounting compatibility as the second illumination device 7 shown in the first embodiment. The substrate 2 is irradiated with light from an illumination direction that is attached to the lower portion and forms a predetermined angle with respect to the imaging direction of the camera 4.

  Next, the structure of the second lighting device 107 will be described with reference to FIGS. In FIG. 7, a housing 120 is connected to the lower end portion of the housing portion of the imaging optical system 5 similar to that of the first embodiment. The housing 120 has a substantially rectangular box shape with the substrate 2 side open, similar to the housing 20 in the first embodiment, and an upper surface of the planar portion 120a has a size corresponding to the imaging range of the camera 4. An opening 120c is provided. The planar portion 120a is orthogonal to the imaging direction of the camera 4, that is, the imaging optical axis A of the camera 4, and the side surface of the housing 120 is parallel to the imaging optical axis A.

  An LED substrate 124 similar to the LED substrate 24 in the first embodiment is mounted inside the housing 120 via the LED holding member 131 and the coupling member 122. As shown in FIG. 8, a plurality of LED light sources 26 are densely arranged in a staggered pattern on the LED substrate 124, and in this state, the illumination light emitted from the LED light sources 26 is captured in the imaging direction of the camera 4. That is, the substrate 2 is irradiated at a predetermined angle α with respect to the imaging optical axis A of the camera 4.

  On the light source surface side of the LED substrate 124, a light diffusing plate 127 is disposed so as to cover the front surface of the LED light source 26 and held by the LED holding member 131, and diffuses the light from the LED light source 26 to form the substrate 2. Is uniformly irradiated. Also in the second embodiment, four sets of the LED substrate 124 and the light diffusion plate 127 surround the imaging opening 120c from the periphery, and are arranged at 90 degrees equidistant positions in an axial symmetry with respect to the imaging optical axis A. Each is held by the coupling member 122 and attached to the housing 120.

  Next, the structure of the LED holding member 131 and the coupling member 122 and the method of mounting the LED substrate 124 to the housing 120 will be described with reference to FIGS. In FIG. 9, the LED holding member 131 has a shape in which the upper part of the quadrangular pyramid is cut off in a horizontal plane, and an opening 131 a having a size corresponding to the imaging opening 120 c of the housing 120 is provided in the upper part. . Further, the lower portion of the four weight surface portions 131b of the LED holding member 131 is partially cut away to form a notch portion 131c.

  Each weight surface portion 131b is provided with screw holes 131d and 131e. The light diffusing plate 127 is fixed to the weight surface portion 131b by inserting a bolt 128 into a mounting hole provided in the light diffusing plate 127, screwing it into the screw hole 131d and fastening it. In addition, the bolt 125 is inserted through the mounting hole provided in the LED board 124 and the shaft hole of the hollow shaft member 123 in order, and the LED board 124 is separated from the weight surface portion 131b by the shaft member 123. Screw and fasten.

  At this time, the bolt 125 is inserted from the back side of the LED substrate 124 and fixed with the LED light source 26 facing obliquely downward. That is, in the above configuration, the LED holding member 131 holds the LED substrate 124 in a separated state via the shaft member 123 from the surface side on which the LED light sources 26 are arranged. The LED holding member 131 may be formed as an integral member, or a member divided for each weight surface portion may be combined.

Further, in attaching the light diffusion plate 127, the LED substrate 124 and the light diffusion plate 127 are both fixed in parallel to the same weight surface portion 131b. Further, the weight surface portion 131b has an opening portion 131a.
Therefore, the light diffusing plate 127 is outside the imaging opening 120c. That is, the light diffusing plate 127 is held by the LED holding member 131 in a state of being substantially parallel to the LED substrate 124 and not overlapping the imaging range of the camera 4.

  As described above, the LED holding member 131 to which the LED substrate 124 and the light diffusing plate 127 are attached is coupled to a coupling member 122 described below. The coupling member 122 has a configuration in which vertical corner portions 122d having dimensions are fitted to the inner surface of the housing 120 at four corners of a flat plate portion 122a having a substantially cross-shaped opening 122b on the lower surface. It has become. The coupling member 122 is attached to the housing 120 by fitting the vertical corner portion 122 d to the inner surface side of the housing 120.

  The LED holding member 131 is a coupling member formed by inserting a bolt 132 from a lower surface side into a mounting hole 122c provided in the flat surface portion 122a, and screwing and tightening a screw hole provided in the lower surface of the LED holding member 131. 122. In this state, the illumination light emitted from the LED substrate 124 is emitted obliquely downward through the notch 131c and the opening 122b.

  Then, the coupling member 122 to which the LED substrate 124 and the light diffusing plate 127 are attached via the LED holding member 131 in this way is attached to the housing 120 as shown in FIG. In the housing 120, the inner surface of the side surface portion 120b is a first reference surface H provided in a direction parallel to the imaging direction as a reference for fixing the side surface side of the vertical corner portion 122d. Further, the lower surface of the flat surface portion 120a is a second reference surface I provided in a direction orthogonal to the imaging direction as a reference when fixing the upper surface side of the vertical corner portion 122d. That is, the first reference plane H and the second reference plane I are a pair of reference planes that are orthogonal to each other and formed in a direction orthogonal to the imaging direction and a direction parallel to the imaging direction on the inner surface side of the housing 120. .

  When the coupling member 122 is mounted on the housing 120, the outer surface of the vertical corner 122d, that is, the first mounting surface F is the first reference surface H, and the upper surface of the vertical corner 122d, that is, the second mounting surface G is Each abuts against the second reference plane I. Then, the bolt 130 is inserted into the mounting hole 120d and screwed into the screw hole 122e to be fastened. Accordingly, the first reference surface H is in close contact with the first mounting surface F and the second reference surface I is in close contact with the second mounting surface G, and the coupling member 122 is fixed to the housing 120.

  The first mounting surface F on the outer surface of the vertical corner portion 122d and the second mounting surface G on the upper surface of the vertical corner portion 122d are formed orthogonal to the coupling member 122 to which the LED holding member 131 is coupled, and the first reference surface H and a pair of mounting surfaces that come into contact with a pair of reference surfaces made of the second reference surface I. In this state, as shown in FIGS. 7 and 10, the LED holding member 131 is located outside the imaging opening 120 c and does not interfere with the imaging range of the camera 4. That is, the coupling member 122, the bolt 132, and the bolt 130 serve as a fixing unit that detachably fixes the LED coupling member 131 to the housing 120 without interfering with the imaging range.

  The first mounting surface F on the outer surface of the vertical corner 122d and the second mounting surface G on the upper surface of the vertical corner 122d are formed orthogonal to the coupling member 122 and abut against the pair of reference surfaces described above. It is a pair of mounting surfaces.

  Then, the LED holding member 22 is attached by screwing the coupling member 122 to the housing 120 in a state where the pair of mounting surfaces are in close contact with a pair of reference surfaces provided on the inner surface side of the housing 120. The posture shown in FIG. 7 is fixed, whereby the direction of light emitted from the LED light source 26 matches the intended illumination direction, that is, the illumination direction set to form a predetermined angle α with the imaging direction by the camera 4. Can be made.

  The illumination devices described in the first and second embodiments are provided with an LED substrate in which a plurality of LED light sources are arranged in a substantially planar shape, and an imaging opening corresponding to the imaging range of the camera 4, and aligns the LED substrate. For which a reference plane is formed in association with the imaging direction, an LED holding member that holds the LED substrate and that does not interfere with the imaging range, and is detachable from the housing It has the structure which has a fixing means to fix to.

  Then, the direction of light emitted from the LED light source is made to coincide with the illumination direction by bringing the mounting surface provided on the LED holding member into close contact with the reference surface. The example of a structure which has arrange | positioned the LED board symmetrically about the imaging optical axis of the camera is shown.

  By adopting such a configuration, it is possible to easily replace the LED substrate without impairing the reproducibility of the irradiation direction of the illumination light in the illumination device using the LED used for the imaging device as a light source, and to maintainability. An excellent imaging device is realized.

  In the first and second embodiments, the example in which the substrate located below the imaging device is imaged is shown, but the present invention is not limited to this. The imaging device may be turned upside down to image an electronic component such as a semiconductor chip located above.

  The imaging device of the present invention has an effect that an LED can be easily exchanged and an imaging device excellent in maintainability can be realized, and is used for imaging an object in an electronic component mounting device or an appearance inspection device. Useful.

1 is a block diagram showing the configuration of an imaging apparatus according to Embodiment 1 of the present invention. Side sectional drawing of the illuminating device of Embodiment 1 of this invention. Explanatory drawing of the attachment state of the LED board in the illuminating device of Embodiment 1 of this invention. The bottom view of the illuminating device of Embodiment 1 of this invention. The exploded perspective view of the illuminating device of Embodiment 1 of this invention. The partial exploded sectional view of the illuminating device of Embodiment 1 of this invention Side sectional view of the lighting apparatus according to Embodiment 2 of the present invention. Explanatory drawing of the attachment state of the LED board in the illuminating device of Embodiment 2 of this invention. The exploded perspective view of the illuminating device of Embodiment 2 of this invention. The partial exploded sectional view of the illuminating device of Embodiment 2 of this invention

Explanation of symbols

2 Substrate 3 Imaging unit 4 Camera 5 Imaging optical system 6 First illumination device 7, 107 Second illumination device 20, 120 Housing 20c, 120c Imaging opening 22, 131 LED holding member 23, 123 Shaft member 24, 124 LED board 26 LED light source 27, 127 Light diffusing plate 122 Coupling member

Claims (2)

An imaging apparatus for imaging an object while irradiating the object with light, the camera capturing an image of the object, and light from the illumination direction forming a predetermined angle with respect to an imaging direction by the camera An illumination device for irradiating,
The illumination device includes a substantially rectangular box-shaped housing that is connected to a housing portion of an imaging optical system of the camera and the object side is opened, and an imaging range of the camera on a connection side of the camera with the camera. An imaging opening provided corresponding to the reference plane, a reference plane formed on the inner surface side of the housing in a direction orthogonal to or parallel to the imaging direction, and axially symmetric with respect to the imaging optical axis of the camera And a plurality of LED substrates arranged in a substantially flat position at 90 degrees, respectively, and a plurality of LED light sources arranged in a substantially planar manner, and the LED substrates are held apart from each other through a shaft member from the back side where the LED light sources are not arranged. An LED holding member, a mounting surface formed on the LED holding member and in contact with the reference surface, a fixing means for detachably fixing the LED holding member to the housing without interfering with the imaging range, L And a light diffusion plate for diffusing light from the LED light source is held in the LED holding member in a state not overlapping the D substrate substantially parallel and the imaging range,
An image pickup apparatus characterized in that a direction of light emitted from the LED light source coincides with the illumination direction by bringing the mounting surface into close contact with the reference surface. An imaging apparatus for imaging an object while irradiating the object with light, the camera capturing an image of the object, and light from the illumination direction forming a predetermined angle with respect to an imaging direction by the camera An illumination device for irradiating,
The illumination device includes a substantially rectangular box-shaped housing that is connected to a housing portion of an imaging optical system of the camera and the object side is opened, and an imaging range of the camera on a connection side of the camera with the camera. An imaging opening provided corresponding to the reference plane, a reference plane formed on the inner surface side of the housing in a direction orthogonal to or parallel to the imaging direction, and axially symmetric with respect to the imaging optical axis of the camera Are arranged at 90 degrees equidistant positions, each of which has a plurality of LED light sources arranged in a substantially planar manner, and the LED substrates are held apart from the surface side on which the LED light sources are arranged via a shaft member. An LED holding member, a mounting surface formed on a coupling member to which the LED holding member is coupled, abutting on the reference surface, and the LED holding member are detachably fixed to the housing without interfering with the imaging range. Fixed A stage and, a light diffusion plate for diffusing light from the held LED substrate substantially parallel and in a state not overlapping the imaging range in the LED holding member and the LED light source,
An image pickup apparatus characterized in that a direction of light emitted from the LED light source coincides with the illumination direction by bringing the mounting surface into close contact with the reference surface.

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