Imaging device

Abstract

To provide an imaging device capable of suitably emitting light toward an imaging object.SOLUTION: An imaging device 1 includes: a light source 132 that emits light to be irradiated on an imaging object; an imaging element 43 that images the imaging object; an imaging lens 41 that forms an image of the imaging object on the imaging element 43; and a light guide part 134 that guides the light emitted from the light source 132. The light source 132 is positioned closer to the imaging element 43 side relative to the tip of the imaging lens 41. The light guide part 134 extends parallel to an optical axis, makes light from the light source 132 incident from a light incidence part 134c, guides the light in a direction parallel to the optical axis toward the tip of the imaging lens 41, and emits the light from a light exit part 134d.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to an imaging device. [Background technology]

[0002] There is known a technique for evaluating and diagnosing the condition of human skin from an image of the skin (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 579721 Summary of the Invention [Problem to be solved by the invention]

[0004] In order to capture an image of human skin using an imaging device, it is preferable to uniformly irradiate the skin with light from a light source provided in an illumination device from the front. However, since various components are arranged in the imaging device, it is difficult to optimally arrange the light source that irradiates the image target with light.

[0005] The present invention has been made in view of the above-mentioned problems, and has an object to provide an imaging device that can suitably irradiate light toward an imaging subject. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the imaging device of the present invention includes a light source that emits light to be irradiated onto an imaging target, an imaging element that images the imaging target, an imaging lens that forms an image of the imaging target on the imaging element, and a light guiding section that guides the light emitted by the light source, wherein the light source is provided on the imaging element side rather than the tip of the imaging lens, and the light guiding section extends parallel to the optical axis, and allows light from the light source to enter through a light entrance section, guides the light in a direction parallel to the optical axis towards the tip of the imaging lens, and emits it from a light exit section. Effect of the Invention

[0007] According to the present invention, it is possible to provide an imaging device that can suitably irradiate light toward an imaging target. [Brief description of the drawings]

[0008] [Figure 1] 1 is a perspective view of an imaging device according to a first embodiment of the present invention. [Diagram 2] 2 is a perspective view showing a state in which a lens hood and a diffusion plate are removed from the imaging device shown in FIG. [Diagram 3] 1 is an exploded perspective view of an imaging device according to a first embodiment of the present invention. [Figure 4] 1 is a front view showing a state in which a lens hood and a diffusion plate are removed from an illumination device of an imaging device according to a first embodiment of the present invention. [Diagram 5] 5 is an end view of the lighting device taken along line VV in FIG. 4. FIG. [Figure 6] 2 is a perspective view showing an exploded view of a holding section and a second LED substrate of the imaging device according to the first embodiment of the present invention. FIG. [Figure 7] 5 is a front view focusing on a holding portion shown in FIG. 4 that holds a light guiding portion. [Figure 8] 1 is a cross-sectional view showing a state in which light is irradiated to an image pickup subject with a tip of a lens hood of the image pickup device according to the first embodiment of the present invention being in contact with the image pickup subject. [Figure 9] 13 is a front view showing a state in which a lens hood and a diffusion plate are removed from an illumination device of an imaging device according to a second embodiment of the present invention. FIG. [Figure 10] 10 is an end view of the lighting device taken along line XX in FIG. 9. [Figure 11] 11 is a perspective view showing an exploded view of a first light guiding section, a holding section, and a second LED board of an imaging device according to a second embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an imaging device according to an embodiment of the present invention will be described with reference to the drawings. In the following description, as shown in Fig. 1, the imaging target (subject) side is the front (front face) of the imaging device 1, the opposite side is the rear, and the up, down, left and right directions when the imaging device 1 is viewed from the front are the up, down, left and right directions.

[0010] (Embodiment 1) The imaging device 1 according to the first embodiment captures an image of human skin as an imaging target. As shown in Fig. 2, the imaging device 1 has a detachable lens hood 70 and a diffusion plate 80. By bringing the tip of the lens hood 70 into contact with the skin with the lens hood 70 attached, the skin and the imaging device 1 can be placed in a predetermined positional relationship to capture an image.

[0011] As shown in FIG. 3, the imaging device 1 has a controller 2, a camera body 3, and an illumination device 4 provided in front of the camera body 3.

[0012] The controller 2 has a display unit 10 provided with a touch panel type liquid crystal monitor 11 that displays various operation information and captured images and accepts user operations, a main body unit 20 provided with operation buttons such as a shutter button 21 and a power button 22, and a circuit board 30 accommodated between the display unit 10 and the main body unit 20. The display unit 10 is provided with a plurality of operation buttons 5 arranged vertically for operating each part from the rear. A cylindrical part 23 protruding forward is formed on the front surface of the main body unit 20. The circuit board 30 is also provided with a storage unit 200 that stores captured images and a control unit 300 that controls each part of the imaging device 1. The control unit 300 is, for example, a CPU (Central Processing Unit).

[0013] The camera body 3 has an imaging section 40. The imaging section 40 has an imaging lens system 41 having a lens group arranged on an optical axis OA. In addition, an imaging element 43 is housed behind the imaging lens system 41, as shown in FIG.

[0014] The imaging lens system 41 includes an imaging lens group 41a having a plurality of lenses on an optical axis OA, and a lens barrel 41b housing the imaging lens group 41a. The imaging lens group 41a is interposed between the skin, which is the imaging target, and the imaging element 43, and forms an image of the imaging target on the imaging element 43. The imaging lens group 41a includes a lens that is movable in the front-rear direction, which changes the focal length and allows the magnification ratio to be changed.

[0015] The imaging element 43 is a known imaging element, such as a CCD (Charge Coupled Device) image sensor or a CMOS (Complementary Metal Oxide Semiconductor) image sensor, and is configured to convert an optical image of a subject into an electrical signal. The imaging unit 40 can capture an image of a subject using the imaging element 43. The imaging unit 40 can capture, for example, still images and moving images.

[0016] As shown in FIG. 3, the lighting device 4 has a lighting device main body 100 attached to the main body 20 of the controller 2, a holding portion 150 provided on the lighting device main body 100, a lens hood 70 that can be attached and detached to the lighting device main body 100, and a diffusion plate 80 (FIG. 2).

[0017] As shown in FIG. 5, the lighting device body 100 has a base portion 110 and a ring-shaped cover portion 120 that covers the periphery of the base portion 110.

[0018] The base portion 110 is provided with a first LED board 115 and a second LED board 130 on which LEDs (Light Emitting Diodes) are mounted as light sources, and a holder 150 for holding a first light guide portion 134 and a second light guide portion 135 (FIG. 6) for guiding light emitted from the LEDs mounted on the second LED board 130. The base portion 110 is made of, for example, a black synthetic resin. The base portion 110 has a cylindrical portion 111, an inclined wall 112 extending obliquely backward from the rear end of the cylindrical portion 111, and a bottom wall 113 connecting the rear end of the inclined wall 112. The base portion 110 has an accommodation space 110a defined by the inner wall of the cylindrical portion 111, the inner wall of the inclined wall 112, and the inner wall of the bottom wall 113, for accommodating various components.

[0019] The outer diameter of the cylindrical portion 111 is approximately the same as the inner diameter of the cylindrical portion 23 of the main body portion 20 shown in Fig. 3, and the outer peripheral surface of the cylindrical portion 111 fits into the inner peripheral surface of the cylindrical portion 23. In this way, the base portion 110 is attached to the cylindrical portion 23. In addition, as shown in Fig. 5, a first LED substrate 115 is placed on the tip of the cylindrical portion 111.

[0020] The inclined wall 112 has a plurality of wall bodies that connect the lower end of the cylindrical portion 111 and the bottom wall 113. The plurality of inclined walls 112 facing in different directions are connected to the bottom wall 113 from all four sides.

[0021] The bottom wall 113 is a wall facing forward and forms the bottom of the base unit 110. A total of four screw holes 113b for attaching the holding unit 150 are formed in the bottom wall 113. In addition, a lens barrel insertion hole 113a through which the lens barrel 41b of the imaging unit 40 is inserted is formed in the center of the bottom wall 113.

[0022] As shown in Fig. 4, the first LED substrate 115 is a disk-shaped substrate and has 16 LEDs 116 arranged in the circumferential direction. In order to clarify the installation position, the LEDs 116 are illustrated by two-dot chain lines in the end view of Fig. 5 as intersecting with the cutting line VV. The LEDs 116 are, for example, LEDs that emit white light, and function as a ring flash that emits light forward from the outer periphery of the lighting device main body 100. The LEDs 116 irradiate light toward the skin when the skin is photographed (first photographing) with the imaging device 1 as a general camera from which the lens hood 70 and the diffusion plate 80 shown in Fig. 1 have been removed.

[0023] The second LED substrate 130 is accommodated in a substrate accommodation portion 156 formed behind the holding portion 150, as shown in FIG. 5. The second LED substrate 130 thus provided behind the holding portion 150 is disposed behind (on the imaging element side) the front end (tip) of the imaging lens system 41. The second LED substrate 130 is a substrate having a substantially rectangular outer shape as shown in FIG. 6, and a barrel insertion hole 130a is formed in the center through which the barrel 41b of the imaging portion 40 shown in FIG. 3 is inserted. The barrel insertion hole 130a is a circular hole whose center coincides with the optical axis OA. The second LED substrate 130 is fixed to the holding portion 150 from the rear by a screw 131. The second LED substrate 130 is formed with three screw insertion holes 130b through which the screws 131 are inserted.

[0024] In addition, four first LEDs 132 and four second LEDs 133 are provided on the periphery of the barrel insertion hole 130a on the second LED substrate 130. The first LEDs 132 and the second LEDs 133 emit light when an image is captured (second image capture) with the tip of the lens hood 70 shown in FIG.

[0025] The first LED 132 emits white visible light. As shown in Fig. 7, the first LED 132 is arranged on an imaginary circle C1 whose center coincides with the optical axis OA when viewed from a direction parallel to the optical axis OA. The first LED 132 is arranged at an angle θ1 with respect to the center of the imaginary circle C1. The angle θ1 is 90 degrees. From another perspective, the arrangement of the first LED 132 is provided at each vertex of an imaginary square whose center coincides with the optical axis OA.

[0026] The second LED 133 emits ultraviolet light. When viewed from a direction parallel to the optical axis OA, the second LED 133 is disposed on a virtual circle C2 whose center coincides with the optical axis OA. The radius of the virtual circle C2 is greater than the radius of the virtual circle C1. The second LED 133 is disposed counterclockwise from the center of the virtual circle C2 at angles θ2, θ3, θ2, and θ3. Here, the angle θ2 is, for example, 52 degrees, and the angle θ3 is, for example, 128 degrees. From another perspective, the arrangement of the second LED 133 is provided at each vertex of a virtual rectangle whose center coincides with the optical axis OA.

[0027] In this way, the imaging device 1 is provided with an LED 116 that emits light when taking the first image, which is a general image, and a first LED 132 that emits visible light and a second LED 133 that emits ultraviolet light when taking the second image by setting the distance between the skin, which is the image subject, and the imaging device 1 at a predetermined distance.

[0028] As shown in FIG. 6, a first light guiding portion 134 is disposed in front of each of the first LEDs 132, and a second light guiding portion 135 is disposed in front of each of the second LEDs 133.

[0029] The first light guiding section 134 has an optical fiber bundle 134a made of a plurality of optical fibers and bundling sections 134b wound around both ends of the bundle. The bundling section 134b is, for example, a stainless steel tube, but may be bundled with a member made of other metals or resin. The diameter of each optical fiber is, for example, 0.2 mm. The diameter of the optical fiber bundle 134a in which the optical fibers are bundled is, for example, about 2.0 mm. The imaging device 1 has a size of a general camera, and the length in the front-rear direction of the first light guiding section 134 housed therein is, for example, 5 mm to 10 mm. The first light guiding section 134 is linearly extended in the front-rear direction (direction parallel to the optical axis OA). One end of the first light guiding section 134 faces the first LED 132 as the light input section 134c, and the other end faces forward as the light output section 134d. The first light guiding section 134 receives light from the first LED 132 through the light entrance section 134c, guides the light forward (toward the tip of the imaging lens system 41) while totally reflecting the light inside each optical fiber, and emits the light forward from the light exit section 134d. Note that, as shown in Fig. 7, each light exit section 134d is disposed on an imaginary circle C1 whose center coincides with the optical axis OA when viewed from a direction parallel to the optical axis, and is equidistant to each other from the optical axis OA.

[0030] The second light guiding section 135 has a similar configuration to the first light guiding section 134, and includes an optical fiber bundle 135a made of a plurality of optical fibers and bundling sections 135b wound around both ends of the bundle 135a, as shown in FIG. 6. The diameter of each optical fiber is, for example, 0.2 mm. The diameter of the optical fiber bundle 135a obtained by bundling the optical fibers is, for example, about 2.0 mm. The length of the second light guiding section 135 in the front-rear direction is, for example, 5 mm to 10 mm, similar to the first light guiding section 134. The second light guiding section 135 is linearly extended in the front-rear direction. One end of the second light guiding section 135 faces the second LED 133 as the light input section 135c, and the other end faces forward as the light output section 135d. The second light guiding section 135 receives light from the second LED 133 through the light entrance section 135c, guides the light forward while totally reflecting the light inside each optical fiber, and emits the light forward from the light exit section 135d. As shown in Fig. 7, when viewed from a direction parallel to the optical axis, each light exit section 135d is disposed on an imaginary circle C2 whose center coincides with the optical axis OA, and the distances from the optical axis OA are equal to each other.

[0031] The holding part 150 is fixed to the housing space 110a of the base part 110 via screws 151, as shown in Fig. 5. The holding part 150 has a substantially rectangular planar shape when viewed from the front, as shown in Fig. 6, and has screw insertion holes 152 for inserting the screws 151 formed at the four corners. In addition, as shown in Fig. 5, a board housing part 156 which is a recess for housing the second LED board 130 is formed on the rear surface (back surface) of the holding part 150.

[0032] As shown in FIG. 6, the holding portion 150 is formed with a lens barrel insertion hole 153 through which the lens barrel 41b (FIG. 3) of the imaging portion 40 is inserted, a first insertion hole 154 through which the first light guiding portion 134 is inserted, and a second insertion hole 155 through which the second light guiding portion 135 is inserted.

[0033] The lens barrel insertion hole 153 is formed in the center of the holding portion 150 when viewed from the front. The lens barrel insertion hole 153 is a circular hole whose center coincides with the optical axis OA. The imaging lens system 41 with the lens barrel 41b inserted into the lens barrel insertion hole 153 faces forward from the illumination device body 100, as shown in FIG.

[0034] As shown in FIG. 6, the first insertion hole 154 is a through hole formed on the periphery of the barrel insertion hole 153 in correspondence with the first LED 132. That is, as shown in FIG. 7, the first insertion hole 154 is disposed at an angle of 90 degrees with respect to the center of the imaginary circle C1. The diameter of the first insertion hole 154 is approximately the same as the diameter of the first light guiding section 134. Also, the depth (length in the front-rear direction) of the first insertion hole 154 is approximately the same as the length of the first light guiding section 134, as shown in FIG. 5. The first light guiding section 134 is inserted into the first insertion hole 154, whereby it is held within the first insertion hole 154.

[0035] The second insertion hole 155 is a through hole formed in the periphery of the lens barrel insertion hole 153 in correspondence with the second LED 133. That is, the second insertion hole 155 is disposed at angles θ2, θ3, θ2, and θ3 in a counterclockwise direction with respect to the center of the imaginary circle C2 as shown in FIG. 7. Here, the angle θ2 is, for example, 52 degrees, and the angle θ3 is, for example, 128 degrees. The diameter of the second insertion hole 155 is approximately the same as the diameter of the second light guiding section 135. In addition, the depth (length in the front-rear direction) of the second insertion hole 155 is approximately the same as the length of the second light guiding section 135. The second light guiding section 135 is held in the second insertion hole 155 by being inserted into the second insertion hole 155.

[0036] As shown in FIG. 5, the cover 120 covering the periphery of the front end of the base 110 has a cover body 121 and a light-transmitting plate 122 provided on the front surface of the cover body 121. The cover body 121 is made of, for example, black synthetic resin, and a space for accommodating the first LED substrate 115 is formed inside. A female screw 121b that screws into the lens hood 70 is formed on the inner peripheral surface of the cover body 121. In addition, a light emission hole 121a is formed in the cover body 121 at a position corresponding to the LED 116. The light-transmitting plate 122 is made of, for example, transparent synthetic resin, and transmits light from the LED 116 emitted through the light emission hole 121a, and prevents dust from entering the inside of the imaging device 1 by covering the light emission hole 121a. In this way, the lighting device 4 can function as a ring flash by emitting light from the LED 116 from a plurality of light emission holes 121a arranged in the circumferential direction.

[0037] As shown in Figs. 1 and 2, the lens hood 70 has a cylindrical shape with a truncated cone shape. The lens hood 70 is made of a material that does not transmit light, such as a resin such as a polyvinyl chloride derivative or an acrylic resin. A paint for preventing light transmission may be applied to the surface of the lens hood 70. As shown in Figs. 2 and 5, the rear end of the lens hood 70 is formed with a male thread 70a that screws into a female thread 121b formed in the cover body 121. The male thread 70a and the female thread 121b formed in the cover body 121 function as an attachment / detachment part for attaching and detaching the lens hood 70 to the cover body 120.

[0038] As shown in FIG. 5, the diffusion plate 80 is fixed to the rear of the lens hood 70 by a screw (not shown). As shown in FIG. 2, the diffusion plate 80 has a first annular portion 81, a second annular portion 82 provided at the opening of the first annular portion 81, a connection portion 83 extending in the vertical direction connecting the inner edge of the first annular portion 81 and the outer edge of the second annular portion 82, and a diffusion film 84. The diffusion film 84 covers the opening defined by the inner edge of the first annular portion 81, the outer edge of the second annular portion 82, and the connection portion 83. The diffusion film 84 is provided in front of the first light guiding portion 134 and the second light guiding portion 135, and diffuses the light emitted from these light guiding portions. Note that no film is provided in an opening 85 provided in front of the imaging lens system 41, defined by the inner edge of the second annular portion 82, and is in an open state.

[0039] During the second photographing, as shown in FIG. 8, the tip of the lens hood 70 is brought into contact with the skin S1, and the skin S1 and the imaging device 1 are placed in a predetermined positional relationship. When irradiating visible light, the first LED 132 is caused to emit light, and the light is guided forward by the first light guide section 134. Then, from the light emitting section 134d of the first light guide section 134 provided around the front end of the imaging lens system 41, light that is approximately parallel to each other is emitted forward. Note that the light emitting section 134d is located forward of the front end of the imaging lens system 41. Note that in FIG. 8, the range irradiated with light by the LED is hatched, and the more brightly irradiated the area is, the darker the hatching is. As shown in FIG. 8, the light emitted from the multiple first LEDs 132 overlap each other, forming a brightly irradiated area B. As a result, the part of the skin S1 surrounded by the lens hood 70 is irradiated brightly by overlapping light from multiple light sources. Since the lens hood 70 is made of a material that does not easily transmit light, the skin S1 surrounded by the lens hood 70 is not easily affected by external light. Therefore, the light from the first LED 132 can be effectively irradiated onto the skin S1 surrounded by the lens hood 70. The light reflected by the skin S1 enters the imaging device 1 and can be guided to the imaging section 40 (FIG. 5). By pressing the lens hood 70 against the skin S1 in this way, the distance between the skin S1 and the imaging device 1 is kept constant, and the brightness of the illuminated skin S1 can be kept constant, and the exposure conditions are stabilized, making it possible to stably perform the second shooting.

[0040] On the other hand, when irradiating ultraviolet light, the second LED 133 shown in Fig. 6 is caused to emit light, and the light is guided forward by the second light guiding section 135. Then, light beams that are approximately parallel to each other are emitted forward from the light emitting sections 135d of the second light guiding sections 135 provided around the front end of the imaging lens system 41, and an image of the skin S1 irradiated with the ultraviolet light is taken.

[0041] Depending on the imaging conditions, it is optional whether or not to attach the diffuser 80. By taking an image without attaching the diffuser 80, it is possible to capture the regular reflection component (texture) from the skin S1. On the other hand, by attaching the diffuser 80, the color changes, and the skin grooves and skin ridges can be captured clearly. In this way, different imaging conditions can be provided depending on whether or not the diffuser 80 is attached.

[0042] Next, the operation of the imaging device 1 will be described. The imaging device 1 starts up when the user operates the power button 22 (FIG. 1). After starting up, the imaging device 1 accepts the user's setting of the shooting mode via the liquid crystal monitor 11 (FIG. 1). The shooting modes include the first shooting mode for normal shooting as described above, and the second shooting mode using the lens hood 70.

[0043] When the first photographing mode is selected as the photographing mode, the control unit 300 causes the ring-shaped LEDs 116 (FIG. 4) to emit light. This brightly irradiates the skin with visible light. Then, when the user half-presses the shutter button 21 shown in FIG. 1, the control unit 300 moves the lens group of the imaging lens system 41 to auto-focus on the skin, which is the subject of the image. Then, when the user presses the shutter button 21 shown in FIG. 1, the control unit 300 photographs the skin and stores the first photographed image. This completes the first photographing.

[0044] On the other hand, when the second photographing mode is selected as the photographing mode, the control unit 300 causes the first LED 132 (FIG. 6) that emits visible light to emit light. Then, when the user operates the shutter button 21 (FIG. 1) to take a second photograph of the skin irradiated with visible light, the control unit 300 then causes the second LED 133 (FIG. 6) that emits ultraviolet light to emit light. Then, the user operates the shutter button 21 (FIG. 1) to take a second photograph of the skin irradiated with ultraviolet light.

[0045] As described above, according to the first embodiment, the light emitted from the first LED 132 and the second LED 133 is guided forward by the light guides 134, 135, and is emitted forward from the light emitting parts around the tip of the imaging lens system 41. By guiding the light forward in this manner, the emitted light does not irradiate other components such as the imaging lens system 41, and the light can be efficiently irradiated onto the skin S1, which is the imaging target.

[0046] In addition, the light emitting parts 134d and 135d can be brought as close as possible to the tip of the imaging lens system, and the light can be emitted in a nearly parallel manner. This makes it possible to suppress parallax (light from different light sources that is not parallel but angled) that occurs when light is emitted from a position away from the imaging lens system 41 at an angle toward the optical axis in order to prevent the light from being irradiated onto the imaging lens system 41.

[0047] In addition, the light emitting sections 134d, 135d of the light guide sections 134, 135 are arranged around the imaging lens system 41 and face the front of the imaging target. This allows the light from the four light emitting sections 134d to be irradiated from the front onto the skin while being close to parallel to each other. By irradiating light in this manner, the tops of the skin mounds of the skin are slightly illuminated while shadows are formed in the skin grooves, making it possible to capture an image in which the skin is clearly visible. The light from the four light emitting sections 135d can also be irradiated from the front onto the skin while being parallel to each other.

[0048] Furthermore, since the first LED 132 that emits visible light and the second LED 133 that emits ultraviolet light are arranged, the imaging subject can be illuminated with different lights, and images that look different can be captured.

[0049] Further, the light exit portions 134d of the first light guide portion 134 that exit the guided visible light are disposed on a virtual circle C1 whose center coincides with the optical axis OA around the imaging lens system 41, or in other words, disposed at each vertex of a virtual square whose center coincides with the optical axis OA. This allows the visible light beams emitted in parallel from the multiple first LEDs 132 to overlap each other as shown in Fig. 8, and makes it possible to suppress unevenness in the illuminance in the area illuminated by the overlapping visible light beams.

[0050] Similarly, the light exit portions 135d of the second light guide portion 135 that exit the guided ultraviolet light are also disposed on a virtual circle C2 whose center coincides with the optical axis OA around the imaging lens system 41, or in other words, disposed at each vertex of a virtual rectangle whose center coincides with the optical axis OA. This allows the ultraviolet light beams emitted in parallel from the multiple second LEDs 133 to overlap, thereby suppressing unevenness in the illuminance in the area irradiated by the overlapping ultraviolet light beams.

[0051] Furthermore, by configuring light guide sections 134, 135 to extend straight in the front-rear direction, light loss in light guide sections 134, 135 can be suppressed.

[0052] In addition, the light guides 134 and 135 are configured with multiple optical fibers. This allows light to be totally reflected many times in a short length range, for example, 5 mm to 10 mm, in the forward and backward directions, resulting in good light emission distribution. By bundling such optical fibers, the irradiation distribution of the entire light guides 134 and 135 can be made good.

[0053] Furthermore, since light guiding sections 134, 135 are held simply by inserting them into insertion holes 154, 155 formed in holding section 150, the structure is simple, the manufacturing cost can be reduced, and the assembly work is easy.

[0054] Furthermore, by configuring the diffusion plate 80 having the diffusion film 84 to be detachable from the lens hood 70, the state of the light irradiated onto the imaging subject can be easily changed.

[0055] (Embodiment 2) Next, the second embodiment will be described with reference to Figs. 9 to 11. When comparing an imaging device 201 according to this embodiment with the imaging device 1 of the first embodiment, the differences are the arrangement of the LEDs that emit light during the second shooting, the shape of the light guiding section that guides the light of the LEDs, and the shape of the holding section that holds the light guiding section. As the other configurations are the same as those of the above embodiment, the same reference numerals are used for the similar configurations and detailed description will be omitted.

[0056] The first LED 232 that emits light during the second photographing is provided on the second LED substrate 230 as shown in FIG. 10. The second LED substrate 230 is screwed to the rear surface of the bottom wall 113 of the base portion 110. The first LED 232 emits white visible light. As shown in FIG. 9, the first LED 232 is arranged on a virtual circle C3, and is provided at each vertex of a virtual rectangle whose center coincides with the optical axis OA. The radius of the virtual circle C3 is larger than the radius of the virtual circle C1 and the radius of the virtual circle C2 shown in FIG. 7. That is, the first LED 232 is arranged at a position farther away from the optical axis OA than the first LED 132 and the second LED 133 shown in FIG. 7.

[0057] 10, a rectangular opening 113c is formed in the bottom wall 113 at a position corresponding to the first LED 232 to expose the first LED 232 to the front of the bottom wall 113. A protrusion 251 having a rectangular cross section protruding downward from a contact surface 252 of the holding part 250 is fitted into this opening 113c. As a result, the holding part 250 is fixed on the second LED substrate 230.

[0058] As shown in FIG. 11, the first light guide 234 has an optical fiber bundle 234a made of a plurality of optical fibers and a bundling portion 234b wound around both ends of the optical fiber bundle 234a, as in the first embodiment. On the other hand, the light guide in the first embodiment extends linearly in the front-rear direction, but in the present embodiment, as shown in FIG. 10, the light guide has a front side portion 234c and a rear side portion 234d extending in the front-rear direction, and an inclined portion 234e connecting the front side portion 234c and the rear side portion 234d. The inclined portion 234e is inclined so as to approach the optical axis OA as it moves forward. As a result, light from the first LED 232 located away from the imaging lens system 41 enters the light entrance portion 234f, which is one end of the first light guide 234, passes through the inclined portion 234e, and is emitted forward from the light exit portion 234g provided around the front end of the imaging lens system 41. In this way, the first light guiding section 234 brings the light from the first LED 232 closer to the imaging lens system 41, and guides the light forward beyond the front end of the imaging lens system 41 before outputting the light. The length of the first light guiding section 234 in the front-rear direction is, for example, 5 mm to 10 mm, but since it has the inclined section 234e, the total length of the first light guiding section 234 is longer than the total length of the first light guiding section in the first embodiment. When viewed from the front, the light output sections 234g of the first light guiding section 234 are arranged at the vertices of an imaginary rectangle whose center coincides with the optical axis OA around the imaging lens system 41 as shown in FIG.

[0059] The holding portion 250 is a member that holds the first light guiding portion 234, and is provided corresponding to each of the first light guiding portions 234. As shown in FIG. 9, the holding portion 250 is substantially rectangular when viewed from the front, and is disposed so that its longitudinal direction faces the optical axis OA. As shown in the enlarged view of FIG. 10, the holding portion 250 has an abutment surface 252 facing rearward that abuts against the bottom wall 113, and a protrusion 251 having a rectangular cross section that protrudes rearward is formed on the abutment surface 252. The holding portion 250 has a first insertion portion 253 having a hole penetrating in the front-rear direction at the position where the protrusion 251 is formed. Also, as shown in FIG. 11, the holding portion 250 has a second insertion portion 254 connected to the first insertion portion 253 and having a groove portion extending obliquely forward so as to approach the optical axis OA, and a third insertion portion 255 connected to the second insertion portion 254 and extending forward. First light guiding portion 234 is held by holding portion 250 with rear portion 234d inserted into first insertion portion 253, inclined portion 234e inserted into second insertion portion 254, and front portion 234c inserted into third insertion portion 255.

[0060] According to the imaging device 201 of this embodiment, even if the first LED 232 is disposed away from the optical axis OA, the light from the first LED 232 can be brought closer to the optical axis OA by the inclined portion 234e inclined diagonally forward. This allows the light emitting portion 234g of the light guide portion 234 to be disposed around the imaging lens system 41 and to face the front of the imaging subject, so that a clear image of the skin can be captured and the occurrence of parallax can be suppressed, as in the above-mentioned first embodiment.

[0061] Furthermore, the light exit portions 234g of the first light guide portion 234 that exit the guided visible light are disposed at the vertices of a virtual rectangle whose center coincides with the optical axis OA around the imaging lens system 41. This allows the visible light exiting from the multiple first LEDs 232 to overlap, thereby suppressing unevenness in the illuminance in the area illuminated by the overlapping visible light.

[0062] Furthermore, since the light guiding section 234 is held by simply inserting it into the first insertion section 253, the second insertion section 254, and the third insertion section 255 formed in the holding section 250, the configuration is simple, the manufacturing costs can be reduced, and the assembly work is easy.

[0063] This invention is not limited to the above embodiment, and various modifications and applications are possible. In the above embodiment, a light source that emits visible light and a light source that emits ultraviolet light are shown as light sources when taking the second photograph, but other light sources may be provided depending on the required photographing conditions. The arrangement of the light sources is also one example, and other arrangements may be used. Even in that case, it is sufficient to guide the light forward and close to the optical axis OA by the light guide unit.

[0064] In addition, as long as the light guide unit is capable of being held in a predetermined position, it is optional whether or not to use the holding unit described in the above embodiment. For example, the light guide unit may be fixed to the LED substrate by bonding, or a holding unit of another shape may be used.

[0065] Although an optical fiber is used as the light guide, any other suitable light guide may be used as long as it can guide the light from the light source to a desired position and irradiate the light with a good illuminance distribution. For example, a rod-shaped light guide may be used as the light guide.

[0066] Also, in the above description, the diffusion plate that is detachable from the lens hood is provided with a diffusion film that diffuses light, but a film having another function, such as a polarizing film, may be provided. [Explanation of symbols]

[0067] 1...imaging device, 2...controller, 3...camera body, 4...illumination device, 5...operation button, 10...display unit, 11...liquid crystal monitor, 20...main body, 21...shutter button, 22...power button, 23...cylindrical portion, 30...circuit board, 40...imaging unit, 41...imaging lens system, 41a...imaging lens group, 41b...lens barrel, 43...imaging element, 70...lens hood, 70a...male screw, 80...diffusion plate, 81...first annular portion, 82...second annular portion, 83...connection portion, 84...diffusion film , 85...opening, 100...illumination device main body, 110...base portion, 110a...accommodation space, 111...cylindrical portion, 112...inclined wall, 113...bottom wall, 113a...lens barrel insertion hole, 113b...screw hole, 113c...opening, 115...first LED board, 116...LED, 120...cover portion, 121...cover portion main body, 121a...light exit hole, 121b...female thread, 122...translucent plate, 130...second LED board, 130a...lens barrel insertion hole, 130b...screw insertion hole, 132...first LED, 131 ...screw, 133...second LED, 134...first light guide section, 134a...optical fiber bundle, 134b...binding section, 134c...light entrance section, 134d...light exit section, 135...second light guide section, 135a...optical fiber bundle, 135b...binding section, 135c...light entrance section, 135d...light exit section, 150...holding section, 151...screw, 152...screw insertion hole, 153...lens barrel insertion hole, 154...first insertion hole, 155...second insertion hole, 156...substrate housing section, 200...storage section, 201...imaging device, 2 30...second LED substrate, 232...first LED, 234...first light guiding section, 234a...optical fiber bundle, 234b...binding section, 234c...front section 234d...rear section, 234e...inclined section, 234f...light entrance section, 234g...light exit section, 250...holding section, 251...protrusion, 252...contact surface, 253...first insertion section, 254...second insertion section, 255...third insertion section, 300...control section, B...area, C1, C2, C3...virtual circle, OA...optical axis, S1...skin, θ1, θ2, θ3...angles.

Claims

1. A light source that emits light to be irradiated onto an imaging target; an imaging element for imaging the imaging target; an imaging lens that forms an image of the imaging target on the imaging element; a light guide portion that guides the light emitted by the light source, the light source is provided closer to the imaging element than a tip of the imaging lens, the light guide section extends parallel to an optical axis, receives light from the light source through a light entrance section, guides the light in a direction parallel to the optical axis toward a tip of the imaging lens, and emits the light from a light exit section; Imaging device.

2. the light entrance portion of the light guide portion faces the light source, The light output portion of the light guide portion is provided around the tip of the imaging lens. The imaging device according to claim 1 .

3. The light guide portion has a plurality of optical fibers bundled together. The imaging device according to claim 1 .

4. a plurality of the light sources are provided around the imaging lens, The light guiding section is provided corresponding to each of the light sources. The imaging device according to claim 1 .

5. Among the plurality of light sources, some are light sources that emit visible light and some are light sources that emit ultraviolet light. The imaging device according to claim 4.

6. When viewed from a direction parallel to the optical axis, the light exit portions of the light guiding portion that guides the visible light emitted from the light source are located around the imaging lens and are equidistant from the optical axis. The imaging device according to claim 5 .

7. a distance from the optical axis of the light exit portion of the light guide portion is closer than a distance from the optical axis of the light entrance portion of the light guide portion; The light guide portion has an inclined portion inclined toward the optical axis toward the tip of the imaging lens. The imaging device according to claim 1 .

8. A holding part is provided which is fixed inside the imaging device and holds the light guiding part. The imaging device according to claim 1 .

9. an opening for passing the imaging lens through is provided at the center of the holding portion; An insertion hole into which the light guide portion is inserted is formed around the opening. The imaging device according to claim 8.

10. The insertion hole is a hole penetrating in a direction parallel to the optical axis, The light guiding portion extends parallel to the optical axis and guides incident light in a direction parallel to the optical axis. The imaging device according to claim 9.

11. the light source is provided on a light source substrate having an opening for passing the imaging lens therethrough; The light source substrate is fixed to the holder. The imaging device according to claim 9.

Images