JP5421711B2 - Lighting device - Google Patents

Description

  The present invention relates to an illumination device that irradiates an object to be illuminated and an image processing apparatus that includes the illumination device.

2. Description of the Related Art Conventionally, there has been known an image processing apparatus that includes an illuminating device that irradiates light to an object to be illuminated and a camera as an imaging unit that images the object to be illuminated. In such an image processing apparatus, the illumination device is used to irradiate the object with light, thereby ensuring the illuminance and the like required when the object is imaged by the camera.
In this illuminating device, when light is directly applied to an object to be illuminated, a difference in the intensity of light applied to the object to be illuminated is likely to appear, so that the object cannot be uniformly irradiated with light. There was a problem.

In order to solve such problems, there has been proposed an illumination device that directly and indirectly irradiates an object to be illuminated (see, for example, Patent Document 1).
The illumination device described in Patent Document 1 indirectly irradiates light to an object to be illuminated, but also irradiates light to the object evenly because light is directly irradiated to the object to be illuminated. You may not be able to.

Moreover, the illuminating device which irradiates light to a to-be-illuminated object indirectly is proposed (for example, refer patent document 2).
The illumination device described in Patent Document 2 includes a box having an opening that opens on one surface, a light emitting unit that is disposed inside the box and cannot directly irradiate an object to be illuminated, and a light emitting unit. An irregular reflection plate that diffusely reflects the light and reflects it toward the opening, and a transmission diffusion plate disposed in the opening.

  In the illuminating device described in Patent Literature 2, the object to be illuminated is disposed outside the opening side of the box. The irregular reflection plate is disposed at a position facing the object to be illuminated on the inner surface of the box. The illumination device diffuses light with an irregular reflection plate, further diffuses the light irregularly reflected with the irregular reflection plate with a diffuse transmission plate, and irradiates the object with the light. Thereby, according to the illuminating device of patent document 2, the light irradiated to a to-be-illuminated object is disperse | distributed, and it is supposed that light can be uniformly irradiated to a to-be-illuminated object.

JP 2005-158490 A Japanese Patent Laid-Open No. 2-196903

In the illuminating device described in Patent Document 2, the irregular reflection plate is disposed on the inner surface of the box so as to face the object to be illuminated. That is, the object to be illuminated is irradiated with light from a direction orthogonal to the direction in which the irregular reflection plate extends. Moreover, it is supposed that the illuminating device of patent document 2 can make uniform the light irradiated to the outer edge vicinity of a to-be-illuminated object.
Therefore, in practice, the illumination device described in Patent Document 2 may not be able to uniformly irradiate the entire object to be illuminated including the central portion of the object to be illuminated.

  Therefore, an object of the present invention is to provide an illuminating device that can irradiate an object to be illuminated more uniformly and an image processing apparatus including the illuminating device.

  The present invention is an illuminating device used in an image processing apparatus having an imaging unit that images an object to be illuminated, which is a hollow body disposed between the imaging unit and the object to be illuminated, the imaging unit An imaging unit side opening formed on the side, an illuminated object side opening formed on the object side opposite to the imaging unit side opening, the imaging unit side opening, and the A hollow body having an inner surface formed so as to connect to the object-side opening and extending in an imaging direction in which the imaging unit images the object; and A light emitting unit disposed inside the hollow body so that the light emitting surface faces the inner side surface, and emits light toward the inner side surface and cannot emit light directly to the object to be illuminated And a compound disposed along the inner side surface and exposed to the inside of the hollow body. A diffuse reflection portion for reflecting diffused toward the light emitted from the light emitting unit to the object to be illuminated by having the irregularity relates to a lighting device comprising a.

  Further, it is preferable that the inner side surface portion is formed so as to extend substantially parallel to the imaging direction, and the light emitting portion is arranged so that the light emitting surface faces a direction substantially orthogonal to the imaging direction.

  Preferably, two light emitting units are provided, and the two light emitting units are arranged so that light emitted from the respective light emitting surfaces is emitted in directions away from each other.

  Moreover, it is preferable that two said light emission parts are provided, and the two said light emission parts are arrange | positioned facing each other so that each said light emission surface may face each other.

  The present invention relates to an image processing apparatus comprising: the illumination device; and the imaging unit that is disposed to face the illumination object and that images the illumination object through the hollow body of the illumination device.

  ADVANTAGE OF THE INVENTION According to this invention, an image processing apparatus provided with the illuminating device which can irradiate light to a to-be-illuminated object more uniformly, and the said illuminating device can be provided.

It is a side view for demonstrating arrangement | positioning of each component in the image processing apparatus 1 of 1st Embodiment. It is the sectional view on the AA line in FIG. It is a side view for demonstrating arrangement | positioning of each component in 1 A of image processing apparatuses of 2nd Embodiment. FIG. 4 is a sectional view taken along line BB in FIG. 3. It is the figure which looked at the modification in the image processing apparatus 1 of 1st Embodiment from the light emission direction H. FIG.

<First Embodiment>
An image processing apparatus 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a side view for explaining the arrangement of components in the image processing apparatus 1 according to the first embodiment. FIG. 2 is a cross-sectional view taken along the line AA in FIG.

As shown in FIGS. 1 and 2, the image processing apparatus 1 includes an illumination device 2 that irradiates an object T with light, and a camera 3 as an imaging unit that images the object T.
As shown in FIG. 2, the to-be-illuminated object T is comprised by the part which light is irradiated by the illuminating device 2 in the wrapping paper 15 which consists of a film sheet etc. As shown in FIG. Specifically, a long wrapping paper 15 is hung between the first roller 20a and the second roller 20b. The wrapping paper 15 hung along the outer peripheral surface of the first roller 20a is transported in the transport direction L1 from the first roller 20a toward the second roller 20b, and along the outer peripheral surface of the second roller 20b. It is hung and redirected. In addition, although the conveyance direction L1 of the wrapping paper 15 was set as the direction which goes to the 2nd roller 20b from the 1st roller 20a, it is not restrict | limited to this. For example, the conveyance direction of the wrapping paper 15b may be a direction from the second roller 20b toward the first roller 20a.

  A plurality of characters as images are formed on the surface of the wrapping paper 15. The wrapping paper 15 having a plurality of characters or the like formed on the surface sequentially passes through the illumination area E as shown in FIG. The illumination area E is an area where light is irradiated by the illumination device 2. In this embodiment, the part located in the illumination area E in the wrapping paper 15 to be conveyed is referred to as an “illuminated object T”.

The camera 3 is disposed so as to face the object T to be illuminated. The camera 3 images characters and the like formed on the surface of the illumination object T located in the illumination area E irradiated by the illumination device 2. In the present embodiment, the direction in which the camera 3 images the object T is also referred to as “imaging direction S”. The imaging direction S is also the vertical direction.
The camera 3 is configured to have a predetermined viewing angle capable of capturing an object to be illuminated T. An imaging space K is formed between the camera 3 and the object T to be illuminated along the imaging direction S. The imaging space K is a space in which other members and the like that interfere with imaging when the camera 3 captures the object T to be illuminated should not be disposed.

The illuminating device 2 irradiates an object to be illuminated T imaged by the camera 3.
The illuminating device 2 includes a cylindrical portion 5 as a hollow body, two light emitting portions 6 and 6, a diffuse reflection sheet 7 as a diffuse reflection portion, a diffuse transmission plate 8, a partition plate 11, and a cover member 9. Have

  The cylindrical part 5 is disposed between the camera 3 and the object T to be illuminated. The cylindrical part 5 is a cylindrical hollow body having an opening in the vertical direction and a rectangular cross section. The cylindrical part 5 is formed from four rectangular side plates.

  The cylindrical portion 5 includes an imaging unit side opening 51 formed on the camera 3 side, and an illuminated object side opening 52 formed on the object T side opposite to the imaging unit side opening 51. And an inner surface portion 56 formed so as to connect the imaging unit side opening 51 and the illumination object side opening 52. The imaging unit side opening 51 and the imaging unit side opening 51 are formed in a rectangular shape having substantially the same shape when viewed from the imaging direction S.

  The inner side surface portion 56 is formed so as to extend in the imaging direction S. In the present embodiment, the inner side surface portion 56 is formed so as to extend in parallel with the imaging direction S. The inner side surface portion 56 is formed over the entire area in the circumferential direction on the inner peripheral surface of the cylindrical portion 5.

The partition plate 11 is a plate that partitions the space in which the camera 3 is disposed from the lighting device 2. The partition plate 11 prevents a screw or the like from dropping on the object T from the side where the camera 3 is disposed. The partition plate 11 is formed in a plate shape. The partition plate 11 is disposed on the upper side of the cylindrical portion 5. The partition plate 11 is a member that partitions the imaging unit side opening 51 of the cylindrical unit 5 from the camera 3 side.
The partition plate 11 has a camera through hole 11a through which the distal end side of the camera 3 passes. The camera through-hole 11a is disposed through the front end side of the camera 3.

The light emitting unit 6 has a function of emitting light and emitting light.
The light emitting unit 6 has a light emitting surface 6a from which light is emitted.
The two light emitting portions 6 and 6 are arranged inside the cylindrical portion 5 so that the light emitting surfaces 6 a and 6 a face the inner side surface portion 56 of the cylindrical portion 5. The light emitting surface 6 a of the light emitting unit 6 faces a direction substantially orthogonal to the imaging direction S. The light emitted from the light emitting surface 6a is emitted in the horizontal direction. In the present embodiment, the direction in which the light emitting surface 6a faces is also referred to as “light emitting direction H”. The light emission direction H is also a horizontal direction.

  Each of the two light emitting units 6 and 6 has an imaging space K and a cylindrical portion in the horizontal direction so as to avoid the imaging space K required for imaging the object T to be illuminated by the camera 3 in the light emitting direction H. 5 is disposed between the inner side surface portions 56 and 56. Each of the two light emitting units 6 and 6 is disposed on the inner side of the cylindrical portion 5 from each of the inner side surface portions 56 and 56 at a position separated by a predetermined distance in the horizontal direction.

  The two light emitting units 6 and 6 are arranged so that light emitted from the respective light emitting surfaces 6a is separated from each other. Specifically, the two light emitting portions 6 and 6 are arranged such that the light emitting surface 6 a faces the inner side surface portion 56. That is, the light emitting surfaces 6 a and 6 a of the two light emitting parts 6 and 6 face the outside of the cylindrical part 5.

The light emitting unit 6 includes a plurality of LEDs 61 and a case member 63.
The plurality of LEDs 61 are arranged side by side in a direction orthogonal to the imaging direction S and in a direction orthogonal to the light emission direction H. The plurality of LEDs 61 are arranged in a straight line at substantially equal intervals. In the present embodiment, the direction in which the plurality of LEDs 61 are arranged is also referred to as “array direction L”. The arrangement direction L is also a horizontal direction.

  Each of the plurality of LEDs 61 has an LED radiation surface 61 a having a U-shaped cross section that forms the outer shape of each of the plurality of LEDs 61. From the LED radiation surface 61a, light is radiated radially at a predetermined radiation angle around the tip of the LED radiation surface 61a based on the radiation characteristics of the LED 61. The tip of the LED emission surface 61 a is arranged facing the inner side surface 56 side of the cylindrical portion 5. The plurality of LEDs 61 are accommodated in the case member 63.

  The case member 63 forms the outer shape of the light emitting unit 6. The case member 63 has a rectangular parallelepiped shape that is long in the arrangement direction L of the LEDs 61 in which the surface on the inner side surface portion 56 side of the cylindrical portion 5 is opened. The case member 63 is disposed over the entire region in the arrangement direction L inside the cylindrical portion 5. In the imaging direction S, the case member 63 is arranged at a predetermined distance in the vertical direction (imaging direction S) from the end of the tubular portion 5 on the illuminated object T side to the camera 3 side.

  Both end portions in the arrangement direction L of the case member 63 are fixed to the inner surface of the cylindrical portion 5 by the fixing member 65.

  A surface parallel to the imaging direction S and the arrangement direction L formed on the opened inner side surface portion 56 side in the case member 63 functions as the light emitting surface 6 a in the light emitting unit 6. The light emitting unit 6 emits light from the light emitting surface 6a when the plurality of LEDs 61 accommodated in the case member 63 emit light.

  The case member 63 includes a rectangular mounting plate 63a on which the plurality of LEDs 61 are mounted, and a peripheral wall portion 63b. The mounting plate 63 a extends long in parallel with the arrangement direction L of the LEDs 61. The peripheral wall portion 63b is a wall portion that extends from the outer peripheral edge of the mounting plate 63a in a direction perpendicular to the mounting plate 63a (horizontal direction).

  The case member 63 also functions as a member that shields light emitted from the accommodated LEDs 61 from being directly applied to the object T to be illuminated. Specifically, the peripheral wall portion 63b of the case member 63 is light in a direction toward the object to be illuminated T emitted from the LED radiation surfaces 61a of the plurality of LEDs 61 disposed inside the case member 63 at a predetermined radiation angle. Shield. Thereby, the light emitting unit 6 is configured to radiate light toward the inner side surface portion 56 and be unable to directly irradiate the illumination target T with light.

  The diffuse transmission plate 8 is formed of a transparent white plate material. The diffuse transmission plate 8 is disposed along the light emitting surface 6 a of the light emitting unit 6. The diffusion transmission plate 8 transmits and diffuses the light emitted from the light emitting surface 6a.

The diffuse reflection sheet 7 is formed of a white sheet. The diffuse reflection sheet 7 is formed into a sheet shape from, for example, polypropylene.
The diffuse reflection sheet 7 is disposed along the inner side surface portion 56 of the cylindrical portion 5. Specifically, the diffuse reflection sheet 7 is disposed closer to the object to be illuminated T than the position where the light from the light emitting portion 6 is irradiated on the inner side surface portion 56 of the cylindrical portion 5. The diffuse reflection sheet 7 is disposed over the entire area in the circumferential direction of the inner side surface portion 56 of the cylindrical portion 5.

  The diffuse reflection sheet 7 has a plurality of irregularities on the surface. The plurality of projections and depressions formed on the surface of the diffuse reflection sheet 7 are exposed to the inside of the tubular portion 5 by arranging the back surface of the diffuse reflection sheet 7 in contact with the inner side surface portion 56 of the tubular portion 5.

  The diffuse reflection sheet 7 diffuses and reflects the light emitted from the light emitting unit 6 toward the object T to be illuminated. For example, a plurality of fine irregularities are uniformly formed over substantially the entire surface of the diffuse reflection sheet 7. Thereby, the diffuse reflection sheet 7 diffuses and reflects the light emitted from the light emitting unit 6. In the present embodiment, the diffuse reflection sheet 7 diffuses the light emitted from the light emitting unit 6 and reflects it once or a plurality of times. The light diffused by the diffuse reflection sheet 7 and reflected once or a plurality of times is applied to the object T to be illuminated substantially uniformly.

  The cover member 9 is formed in a rectangular parallelepiped box shape. The cover member 9 includes a lower opening formed in substantially the same shape as the imaging unit side opening 51 of the cylindrical part 5, and an upper through hole 9a. The lower opening is joined to the imaging unit side opening 51. A cable, a connector, or the like of the camera 3 passes through the upper through hole 9a. The camera 3 is disposed in the internal space of the cover member 9.

According to the illuminating device 2 of 1st Embodiment, the following effects are show | played, for example.
The illumination device 2 according to the first embodiment is a cylindrical portion 5 disposed between the camera 3 and the object T, and extends in an imaging direction S that is a direction in which the camera 3 images the object T. The cylindrical portion 5 having the inner side surface portion 56 formed as described above, the light emitting portion 6 that emits light toward the inner side surface portion 56 and cannot directly irradiate the object T to be illuminated, and the inner side surface portion 56. And a diffuse reflection sheet 7 that is disposed along the surface and diffuses and reflects light emitted from the light emitting unit 6 toward the object T by having a plurality of projections and depressions.

  Therefore, the light emitted from the light emitting unit 6 is emitted directly toward the diffuse reflection sheet 7 disposed on the inner side surface portion 56 of the cylindrical portion 5 without being directly irradiated on the object T to be illuminated. Further, the light emitted to the diffuse reflection sheet 7 is diffused by a plurality of irregularities formed on the surface of the diffuse reflection sheet 7 and reflected once or a plurality of times. Further, the light diffused and reflected by the diffuse reflection sheet 7 is uniformly irradiated on the object to be illuminated from the oblique direction. Thereby, the illuminating device 2 can irradiate light to the to-be-illuminated object T more uniformly.

  Moreover, in the illuminating device 2 of 1st Embodiment, the inner surface part 56 is formed so that it may extend substantially parallel to the imaging direction S, and the light emission part 6 faces the direction in which the light emission surface 6a is substantially orthogonal to the imaging direction S. Are arranged as follows. Therefore, the diffused light is more uniformly irradiated on the object T to be illuminated. Thereby, the illuminating device 2 can irradiate light to the to-be-illuminated object T more uniformly.

Moreover, in the illuminating device 2 of 1st Embodiment, the two light emission parts 6 and 6 are provided, and the two light emission parts 6 and 6 are the directions in which the light radiated | emitted from each light emission surface 6a mutually spaces apart. Arranged to radiate. Therefore, the illuminating device 2 can irradiate light to the to-be-illuminated object T by the two light emission parts 6 and 6 more uniformly.
Moreover, the illuminating device 2 of 1st Embodiment shortens the distance between the two diffuse reflection sheets 7 and 7 which oppose in the light emission direction H compared with 2 A of illuminating devices 2A of 2nd Embodiment mentioned later. Can be configured. Thereby, the illuminating device 2 of 1st Embodiment can make the length of the light emission direction H in the cylindrical part 5 small compared with 2 A of illuminating devices of 2nd Embodiment. Therefore, the illuminating device 2 of 1st Embodiment can be comprised compactly compared with 2 A of illuminating devices of 2nd Embodiment.

  Next, another embodiment of the present invention will be described. The other embodiments will be described mainly with respect to differences from the first embodiment, and the same configurations as those of the first embodiment will be denoted by the same reference numerals and detailed description thereof will be omitted. For the points not specifically described in other embodiments, the description of the first embodiment is appropriately applied or incorporated.

Second Embodiment
With reference to FIGS. 3 and 4, an outline of an image processing apparatus 1A according to the second embodiment of the present invention will be described. FIG. 3 is a side view for explaining the arrangement of each component in the image processing apparatus 1A of the second embodiment. 4 is a cross-sectional view taken along line BB in FIG.
In the image processing apparatus 1A according to the second embodiment, compared to the image processing apparatus 1 according to the first embodiment, the two light emitting units 6 and 6 are arranged to face each other such that the light emitting surfaces 6a and 6a face each other. This is mainly different.

As shown in FIGS. 3 and 4, each of the two light emitting units 6 and 6 in the second embodiment is similar to each of the two light emitting units 6 and 6 in the first embodiment, and includes a plurality of LEDs 61 and a case member 63. And having.
Each of the two light emitting units 6 and 6 in the image processing apparatus 1 </ b> A of the second embodiment is disposed at both ends in the light emitting direction H inside the cylindrical portion 5.
The case members 63 and 63 constituting the outer shapes of the two light emitting portions 6 and 6 are respectively fixed to the two inner side surface portions 56 orthogonal to the light emitting direction H in the tubular portion 5. The two mounting plates 63a and 63a of the two case members 63 and 63 are fixed to the inner side surface portion 56 of the cylindrical portion 5, so that each of the light emitting surfaces 6a and 6a of the two light emitting portions 6 and 6 has an imaging space. Opposing to face each other across K. That is, each of the two light emitting parts 6 and 6 faces the inner side of the cylindrical part 5.

  The cylindrical portion 5A in the second embodiment is formed to have a longer length in the light emitting direction H in the object-side opening 52 and the imaging unit-side opening 51 than the cylindrical portion 5 in the first embodiment. .

  The imaging unit side opening 51 of the cylindrical portion 5 </ b> A is closed by the partition plate 11 </ b> A, a part (lower portion) of the cover member 9 </ b> A, and the flat plate 10.

The cover member 9 </ b> A covers the camera 3 along the imaging direction S of the camera 3. The lower opening of the cover member 9A is formed smaller than the imaging unit side opening 51 of the cylindrical portion 5A. A part of the imaging unit side opening 51 in the cylindrical part 5A is closed by a part of the side plate in the vicinity of the lower end of the cover member 9A.
11 A of partition plates are arrange | positioned only predetermined distance from the lower end part of 9 A of cover members. The partition plate 11A is a plate that partitions the space in which the camera 3 is disposed from the lighting device 2A. The partition plate 11 </ b> A prevents a screw or the like from dropping onto the illuminated object T from the side where the camera 3 is disposed.
The flat plate 10 is disposed in a portion of the cylindrical portion 5A that cannot be covered by the partition plate 11A and the cover member 9A in the imaging portion side opening 51, and closes a part of the imaging portion side opening 51.

According to 2A of illuminating devices of 2nd Embodiment, the following effects are show | played, for example.
In the illuminating device 2A of the second embodiment, two light emitting units 6 are provided, and the two light emitting units 6 and 6 are arranged to face each other such that the respective light emitting surfaces 6a and 6a face each other. Therefore, similarly to the illumination device 2 of the first embodiment, the illumination device 2A of the second embodiment can irradiate the illuminated object T more uniformly by the two light emitting units 6 and 6.

The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and can be implemented in various forms.
For example, in the above-described first embodiment, the plurality of LEDs 61 in the light emitting unit 6 are arranged in one row in the imaging direction (vertical direction) S, but are not limited thereto. For example, the plurality of LEDs 61 may be arranged in a plurality of rows in the imaging direction S.
With reference to FIG. 5, the modification regarding the arrangement | sequence of several LED61 in 1st Embodiment is demonstrated concretely. FIG. 5 is a view of a modification example of the image processing apparatus 1 according to the first embodiment viewed from the light emission direction H. For example, as shown in FIG. 5, the plurality of LEDs 61 in the light emitting unit 6 may be arranged in a staggered manner by being arranged in four rows in the imaging direction S and arranged in a row in the arrangement direction L. .

In the above-described embodiment, the light emitting surface 6a of the light emitting unit 6 faces the horizontal direction, but may be inclined downward from the horizontal direction.
Moreover, in the above-mentioned embodiment, although the illuminating device 2 is set as the structure which has the diffuse transmission board 8, it is not restrict | limited to this. For example, the illuminating device 2 may be configured without the diffuse transmission plate 8.

  Moreover, although it has set as the structure which arrange | positions the diffuse reflection sheet 7 as a diffuse reflection part along the inner surface part 56 of the cylindrical part 5 in above-mentioned embodiment, it is not restrict | limited to this. For example, you may comprise so that a diffuse reflection part may be directly formed in the inner surface part 56 of the cylindrical part 5. FIG.

  Moreover, in the above-mentioned embodiment, although the cylindrical part 5 is a frame shape whose cross section is a rectangular shape, it is not restrict | limited to this. For example, the cylindrical portion 5 may have a frame shape having a cylindrical cross section or a dome shape.

Moreover, in the above-mentioned embodiment, although the illumination area E was made into the square area | region, it is not restrict | limited to this.
Moreover, in the above-mentioned embodiment, the length of the direction (light emission direction) H orthogonal to the conveyance direction L1 in the wrapping paper 15 is not restrict | limited to this. The length of the wrapping paper 15 in the light emitting direction H may be longer than the length of the light emitting direction H in the cylindrical portion 5, for example.
Moreover, in the above-mentioned embodiment, although the to-be-illuminated object T was set as the structure by the elongate wrapping paper 15, it is not restrict | limited to this. For example, the illumination object T may be configured by a non-long object (label) conveyed by a conveyance belt or the like.

DESCRIPTION OF SYMBOLS 1 Image processing apparatus 2 Illumination apparatus 3 Camera (imaging part)
5 Cylindrical part (hollow body)
6 Light emitting part 6a Light emitting surface 7 Diffuse reflective sheet (diffuse reflective part)
51 Imaging unit side opening 52 Illuminated object side opening 56 Inner side surface T Illuminated object S Imaging direction

Claims (2)

An illumination device used when imaging by an imaging unit that images an object to be illuminated,
A cylindrical hollow body disposed between the imaging unit and the object to be illuminated, the imaging unit side opening formed on the imaging unit side, on the side opposite to the imaging unit side opening The illumination object side opening formed on the illumination object side, the imaging unit side opening and the illumination object side opening are connected to each other, and the illumination object is imaged. A hollow body having an inner side surface formed so as to extend substantially parallel to an imaging direction, which is a direction in which the unit images.
A light emitting part disposed inside the hollow body so that the light emitting surface faces the inner side surface part, and radiates light toward the inner side surface part and cannot directly irradiate the illumination object with light. A light emitting unit;
Wherein an emitting portion opposed to the position wherein the illuminated object side diffusion reflecting portion over the opening Ru is disposed along the inner surface portion, is reflected by dispersed expanding the light emitted from the light emitting portion, and a diffuse reflection portion that will be formed to be substantially extends parallel to the imaging direction length such light is reflected several times to be emitted from the light emitting portion,
The illuminating device is an illuminating device , wherein the light emitting unit is arranged such that the light emitting surface faces in a direction substantially orthogonal to the diffuse reflection unit . The light emitting part has the light emitting surface on the diffuse reflection part opposite to the diffuse reflection part on the side where the light emission part is disposed with respect to the center of the hollow body in a direction orthogonal to the diffuse reflection part. Arranged to face
The lighting device according to claim 1.

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