JP6398556B2 - LIGHT EMITTING DEVICE AND IMAGE READING DEVICE - Google Patents

Description

  The present invention relates to an illumination light emitting device and an image reading device.

  2. Description of the Related Art Conventionally, in an image reading apparatus that scans and reads an image of an original, an illumination light emitting device for illuminating the original is used. Examples of the light emitting device for illumination include an LED array in which white LEDs are arranged in the main scanning direction.

  Moreover, as such white LED, what sealed the blue LED element with yellow fluorescent substance containing resin is mentioned. In this case, the blue light emitted from the blue LED and the yellow light generated by the yellow phosphor excited by the blue light are mixed, and white light that is a mixed color of these is obtained as illumination light.

  When such an LED array is used for illuminating a document in an image reading apparatus, the LED array is generally arranged at an angle directly opposite to the image reading position in order to increase the illumination efficiency (see FIG. 2 and the like). However, the illumination light in the region directly facing the blue LED element in the main scanning direction is strong blue light emitted directly from the blue LED element, and the ratio of yellow light by the yellow phosphor is low. On the other hand, in a region far from the position directly facing the blue LED element, the blue light directly emitted from the blue LED element becomes weak and the ratio of yellow light by the yellow phosphor increases.

  As a result, in the main scanning direction of the read image, color unevenness occurs in which an image of a region facing the blue LED element is blue and an image of a region between adjacent blue LED elements is yellow. Color shading due to LED array illumination is reduced by shading correction performed in a general image reading apparatus, but the color of the read image is different because there is a difference in reflectance and scattering rate between the shading correction plate and the original paper. Unevenness cannot be removed. In order to obtain a read image having no color unevenness, it is important to reduce the illumination unevenness of the LED array itself.

  In order to reduce such color unevenness in LED illumination, a method of leveling the ratio of two colors of light emitted from a blue LED element and a yellow phosphor using an optical member such as a diffusion plate, or a yellow phosphor There has been proposed a method for increasing the concentration of yellow phosphor in the resin immediately above the blue LED element and in the vicinity thereof.

JP 2013-0669757 A JP 2007-035802 A JP 2006-261540 A JP 2007-335798 A

  However, when the above LED array is used as a light source of an image reading device, if a means for leveling the light unevenness with an optical member such as a diffusion plate is applied, the emitted light is scattered and the illumination illuminance is reduced. Manufacturing costs increase by adding components. In addition, when applying a means for changing the concentration of the yellow phosphor-containing resin, the blue LED element must be once sealed with the yellow phosphor-containing resin and then further sealed with a high-concentration yellow phosphor-containing resin. The manufacturing method of resin molding becomes complicated, and the manufacturing time increases, resulting in an increase in manufacturing price.

  SUMMARY OF THE INVENTION In view of the above-described problems, the present invention provides an illumination light-emitting device that can obtain a read image with less color unevenness while suppressing a decrease in illuminance and an increase in manufacturing price, and an image reading device including the same. And

  A light emitting device for illumination according to the present invention is provided in an image reading device that scans an original and reads an image, and illuminates the original by emitting light in which light of a predetermined first color and second color is mixed. A plurality of light emitting elements that emit light of the second color are arranged on the substrate facing the document in the main scanning direction, and the light emitting device is disposed on the substrate. A first coating member colored or phosphor-containing so as to emit light of substantially the same color as the first color when exposed to light from the element, and substantially the second color when exposed to light from the light emitting element. A second coating member colored or phosphor-containing so as to emit light of the same color is applied, and the light that travels from the light emitting element to the original after hitting the first coating member; and the light emitting element And the light traveling toward the document after hitting the second coating member It is formed so as to be included in the illumination light, and each of the application areas of the first and second application members includes the first color light and the second color light included in the illumination light. The ratio is set to be leveled in the main scanning direction.

  According to this configuration, it is possible to obtain a read image with little color unevenness while suppressing a decrease in illuminance and an increase in manufacturing price. Note that the original here is not limited to original paper but is a concept that includes a wide range of images that can be read. The main scanning direction and the sub-scanning direction in the present application are directions related to scanning when the image reading apparatus reads an image.

  More specifically, the light emitting element may be a blue LED element, and the first color may be yellow. In the above structure, the light-emitting element may be sealed with a resin containing a phosphor that emits light of the first color. More specifically, the first coating member may include a phosphor that emits light of the first color, and the second coating member may have a shorter wavelength than the first color. It is good also as a structure containing the fluorescent substance which light-emits with a color.

  More specifically, the first application member may be configured such that the closer the position is to the light emitting element, the thicker the application or the higher the reflectance. More specifically, the second application member may have a configuration in which the coating thickness is thicker or the reflectance is higher at a position farther from the light emitting element.

  More specifically, in the configuration described above, the periphery of the light emitting element is surrounded by an inner wall, and a portion of the inner wall including a position facing both sides of the light emitting element in the sub-scanning direction is the first light emitting element. It is good also as a structure by which the application member is apply | coated.

  More specifically, in the configuration described above, the periphery of the light emitting element is surrounded by an inner wall, and a portion of the inner wall including a position facing both sides of the light emitting element in the main scanning direction is the second portion. It is good also as a structure by which the application member is apply | coated.

  More specifically, the region where the first application member is applied is a region on both sides of the light emitting element in the sub-scanning direction, and the region where the second application member is applied is It is good also as a structure which is an area | region of the both sides of the main scanning direction with respect to the area | region where the 1st application member was apply | coated.

  More specifically, in the above configuration, the region where the first application member is applied is a region on both sides in the sub-scanning direction with respect to the light emitting element and a surrounding region, and the second application member is applied. The region may be a region around the region where the first application member is applied.

  An image reading apparatus according to the present invention includes the illumination light-emitting device having any one of the above-described configurations, and the illumination light-emitting device illuminates the original when the original is scanned to read an image. The configuration.

  According to the illumination light emitting device of the present invention, it is possible to obtain a read image with little color unevenness while suppressing a decrease in illuminance and an increase in manufacturing price. In addition, according to the image reading apparatus according to the present invention, it is possible to enjoy the advantages of the illumination light emitting apparatus according to the present invention.

1 is an external view of a copying machine including an image reading device 4 according to the present embodiment. 2 is a schematic external perspective view of the image reading device 4. FIG. FIG. 3 is a schematic cross-sectional view of the image reading device 4 with the main scanning direction as a viewpoint. It is a block diagram of the LED array which concerns on a comparative example. It is explanatory drawing about a part of LED array which concerns on a comparative example. 2 is an explanatory diagram of an LED array according to Example 1. FIG. 6 is an explanatory diagram of an LED array according to Example 2. FIG. 6 is an explanatory diagram of an LED array according to Example 3. FIG. 6 is an explanatory diagram of an LED array according to Example 4. FIG. 10 is an explanatory diagram of an LED array according to Example 5. FIG. 10 is an explanatory diagram of an LED array according to Example 6. FIG.

  Embodiments of the present invention will be described below with reference to the drawings. However, the content of the present invention is not limited to the embodiment.

[Configuration outline of copier]
FIG. 1 is an external view of a copying machine including an image reading apparatus according to the present embodiment. As shown in the drawing, the copying machine includes a document tray 1, an operation panel 2, an automatic document feeder 3, an image reading device 4, a printer unit 5, a paper discharge tray 6, and a paper feed tray 7.

  As an example of the operation of the copying machine, an operation for copying an image of a document sheet set on the document tray 1 to another sheet will be briefly described. When the user operates the operation panel 2 to give a copy instruction, the original document sheet is sent to the image reading device 4 by the automatic document feeder 3. The image reading device 4 scans the supplied original paper to read the image, and sends information of the read image to the printer unit 5. The printer unit 5 prints the read image on the paper supplied from the paper feed tray 7 and discharges the printed paper from the paper discharge tray 6. In this way, the image on the original paper is copied to another paper.

  2 is a schematic external perspective view of the image reading device 4, and FIG. 3 is a schematic sectional view of the image reading device 4 with the main scanning direction as a viewpoint. As shown in these drawings, the image reading device 4 includes an LED array 41 (one form of a light emitting device for illumination), a document table glass 42, an image reading window 43, a folding mirror 45, a lens 46, and a line sensor 47. doing.

  In the LED array 41, a plurality of white LEDs 41b are arranged on the surface of a printed circuit board 41a arranged so as to face a document sheet, spaced apart in the main scanning direction. The LED array 41 plays a role of illuminating the original paper when the image reading device 4 scans the original paper.

  The document table glass 42 can directly place document sheets. By scanning a unit in which the LED array 41 and the line sensor 47 arranged in the main scanning direction are mounted in the sub scanning direction, the image reading from the original paper is appropriately performed. The image reading window 43 is used as an image reading window when the automatic document feeder 3 is used.

  The illumination light emitted from the LED array 41 strikes and reflects the original paper, and then the traveling direction is changed by the folding mirror 45 and enters the line sensor 47 via the lens 46. In this way, the image on the original paper is read.

[Uneven lighting color]
Here, the color unevenness in the illumination of the LED array 41 will be described. First, in order to clarify the factors that cause the color unevenness, a case where a general configuration example (referred to as “comparative example”) is adopted as the LED array 41 is assumed.

  FIG. 4 is a configuration diagram of the LED array 41 according to the comparative example (a diagram viewed so as to face the surface of the printed circuit board 41a). As shown in the figure, the LED array 41 has a form in which a plurality of white LEDs 41b are arranged in the main scanning direction so as to be separated from each other on the surface of a printed circuit board 41a extending in the main scanning direction.

  FIG. 5 is an explanatory diagram of a part of the LED array 41 according to the comparative example (a part including two adjacent white LEDs 41b). The lower part of FIG. 5 is a partial configuration diagram viewed from the same viewpoint as FIG. 4, and the middle part is a central sectional view when cut along the center line L.

  As shown in FIG. 5, in the white LED 41b, the blue LED element 41e (blue LED chip) directly bonded on the printed circuit board 41a is a resin 41c (yellow phosphor-containing resin) containing a phosphor emitting yellow light. And the periphery thereof is surrounded by a case 41d.

  When the blue LED element 41e emits light, light is emitted upward (in the direction of the original paper) from the white LED 41b, along with the straight movement and diffusion of light in the resin 41c. In this process, the yellow phosphor is excited by the blue light from the blue LED element 41e, and yellow light is also generated. As a result, blue light and yellow light are combined and emitted upward as white light.

  The light emitted upward includes light emitted upward from the blue LED element 41e without hitting the printed circuit board 41a (referred to as “direct light” for convenience) and light emitted from the blue LED element 41e. Light that hits the substrate 41a and is emitted upward by reflection or the like (referred to as “indirect light” for convenience) is included. In the vicinity immediately above the blue LED element 41e, the influence of direct light as shown by the solid line arrow in the middle of FIG. 5 becomes strong.

  The influence of direct light is strongest in the vicinity immediately above the blue LED element 41e and becomes weaker as the distance from the blue LED element 41e increases. Therefore, in the range immediately above the blue LED element 41e (range X shown in the upper part of FIG. 5), the ratio of blue light is higher than yellow light generated when the phosphor is excited, and the illumination light has a color closer to blue. End up.

  On the other hand, in the range far from directly above the blue LED element 41e (range Y shown in the upper part of FIG. 5), the ratio of yellow light generated by exciting the phosphor is higher than that of blue light, and the illumination light has a color closer to yellow. turn into. Therefore, in the conventional example, the illumination light from the white LED 41b has color unevenness in the main scanning direction as illustrated in the upper graph of FIG.

  Therefore, in this embodiment, the indirect light described above is used to reduce the uneven color of the illumination. Hereinafter, this point will be described in detail.

  When viewed in the main scanning direction, the indirect light generated in the region overlapping with the blue LED element 41e on the printed board 41a (region A0 shown in FIG. 5) has a strong influence on the illumination light in the range X described above. On the other hand, indirect light generated in a region (region A1 shown in FIG. 5) far from the blue LED element 41e on the printed circuit board 41a has a strong influence on the illumination light in the range Y described above.

  Note that indirect light generated in the region between the regions A0 and A1 (region A2 shown in FIG. 5) has an intermediate effect between them. Indirect light is generated when light emitted from the blue LED element 41e is reflected by the printed circuit board 41a, and when an application member containing a phosphor is applied, the phosphor is excited to emit light. Arise.

  Based on the above principle, when the first application member colored or phosphor-containing so as to emit yellow (or substantially the same color) light in the area A0 or in the vicinity of the area A0, the area X or the area X In the illumination light in the vicinity, the proportion of yellow light increases. This makes it possible to correct the illumination color to the yellow side and bring it closer to white.

  In addition, when the second application member colored or phosphor-containing so as to emit blue (or substantially the same color) light is applied in the area A1 or in the vicinity of the area A1, in the area Y or in the vicinity thereof In the illumination light, the proportion of blue light increases. This makes it possible to correct the illumination color to the blue side and bring it closer to white.

  In the present embodiment, by utilizing these points, the ratio of yellow light and blue light included in the illumination light is at least in the main scanning direction as compared with a state where each of the application members (P1, P2) is not applied. Leveling. As a result, the color unevenness of the illumination light by the white LED 41b is reduced.

  In addition, the optimal form (especially area | region optimal for apply | coating a 1st application member or a 2nd application member) of white LED41b is various, such as the space | interval of white LED41b, the characteristic of blue LED element 41e, and resin 41c It depends on factors. For this reason, it is desirable that the optimum region for applying the first application member and the second application member is set so as to reduce the color unevenness of the illumination light as much as possible in consideration of such various factors. .

  Hereinafter, some specific examples of the white LED 41b according to the present embodiment will be described as Examples 1 to 6. In the LED array 41, the point that the plurality of white LEDs 41b are arranged apart from each other in the main scanning direction is the same as in the conventional example.

[About each example]
First, Example 1 will be described. FIG. 6 is a configuration diagram of the white LED 41b according to the first embodiment. The lower side of the figure shows a central sectional view when cut along the center line L1 extending in the main scanning direction, and the right side of the figure shows the center when cut along the center line L2 extending in the sub-scanning direction. A cross-sectional view is shown.

  In Example 1, a high-concentration yellow phosphor-containing resin is applied as the first application member P1, and blue ink is applied as the second application member P2, as shown in FIG. The first coating material P1 is applied to both sides of the blue LED element 41e in the sub-scanning direction, and the second coating member P2 is applied to the region in which the blue LED element 41e and the first coating member P1 are applied in the main scanning direction. It is applied on both sides.

  Increasing the ratio of yellow light to the illumination of the pixels facing the blue LED element 41e in the main scanning direction by increasing the ratio of yellow light emitted from the regions on both sides of the blue LED element 41e in the sub-scanning direction. Is possible. In addition, the blue ink applied to the surface of the printed circuit board 41a can reduce the ratio of yellow light to the illumination of the pixels between the adjacent white LEDs 41b in the main scanning direction. With these effects, it is possible to reduce the uneven color of the illumination light on the original paper and obtain read image data with little uneven color.

  The first application member P1 may be applied with yellow ink instead of the high-concentration yellow phosphor-containing resin, and the second application member P2 may be applied with blue phosphor-containing resin instead of the blue ink. Also good. When the blue LED element 41e is not sealed with the yellow phosphor-containing resin 41c, the second application member P2 may be an ink of an approximate color to the LED emission color or a phosphor-containing resin of an approximate color. As one application member P1, a resin containing a sealing phosphor at a high concentration or an ink of approximate color may be applied.

  Next, Example 2 will be described. FIG. 7 is a configuration diagram of the white LED 41b according to the second embodiment. Note that the second embodiment basically differs from the first embodiment in that only the application areas of the first application member P1 and the second application member P2 on the printed circuit board 41a are changed. The display of is omitted.

  In the second embodiment, the first application member P1 is applied not only on both sides of the blue LED element 41e in the sub-scanning direction but also around the blue LED element 41e. The second application member P2 is applied around the area where the first application member P1 is applied. According to the second embodiment, the color intensity of the blue LED element 41e can be further reduced compared to the first embodiment with respect to the pixel facing the blue LED element 41e in the main scanning direction. .

  Next, Example 3 will be described. FIG. 8 is a configuration diagram of the white LED 41b according to the third embodiment. Note that the third embodiment basically differs from the first and second embodiments in that only the application areas of the first application member P1 and the second application member P2 on the printed circuit board 41a are changed. Then, the display of the central sectional view is omitted.

  In Example 3, the first application member P1 is applied only to a region relatively close to the blue LED element 41e among the regions on both sides of the blue LED element 41e in the sub-scanning direction. The second application member P2 is applied around the area where the first application member P1 is applied. According to the form of the third embodiment, the effect of weakening the LED emission color with respect to the pixel facing the blue LED element 41e in the main scanning direction is the same as the case of the conventional example and the case of the first embodiment shown in FIG. It is possible to achieve an intermediate effect.

  Next, Example 4 will be described. FIG. 9 is a configuration diagram of the white LED 41b according to the fourth embodiment. The lower side of the figure shows a central sectional view when cut along the center line L1 extending in the main scanning direction, and the right side of the figure shows the center when cut along the center line L2 extending in the sub-scanning direction. A cross-sectional view is shown.

  In the fourth embodiment, the application area of each application member (P1, P2) is the same as that of the first embodiment, but the color density is changed by changing the thickness of the first application member P1 to be applied. Specifically, the thickness of the first application member P1 is increased in the vicinity of the blue LED element 41e, and is decreased as the distance from the blue LED element 41e increases. Thereby, it is possible to suppress an increase in the ratio of the emission color of the sealing phosphor in the distance from the blue LED element 41e while increasing the ratio of the emission color of the sealing phosphor in the vicinity of the blue LED element 41e. It becomes.

  Next, Example 5 will be described. FIG. 10 is a configuration diagram of the white LED 41b according to the fifth embodiment. The lower side of the figure shows a central sectional view when cut along the center line L1 extending in the main scanning direction, and the right side of the figure shows the center when cut along the center line L2 extending in the sub-scanning direction. A cross-sectional view is shown.

  In Example 5, the application area of each application member (P1, P2) is the same as in Example 1, but the color density is changed by changing the thickness of the second application member P2 to be applied. Specifically, the thickness of the second application member P2 is reduced in the vicinity of the blue LED element 41e, and is increased as the distance from the blue LED element 41e increases. Accordingly, it is possible to suppress an increase in the ratio of the LED emission color in the vicinity of the blue LED element 41e while increasing the ratio of the LED emission color in the distance from the blue LED element 41e.

  Next, Example 6 will be described. FIG. 11 is a configuration diagram of the white LED 41b according to the fifth embodiment. The lower side of the figure shows a central sectional view when cut along the center line L1 extending in the main scanning direction, and the right side of the figure shows the center when cut along the center line L2 extending in the sub-scanning direction. A cross-sectional view is shown.

  In Example 6, each application member (P1, P2) is applied as in Example 1, but in addition to this, the inner surface of the case 41d (surface adjacent to the phosphor-containing resin 41c for sealing) Also, each application member (P1, P2) is applied. More specifically, the first application member P1 is applied to the inner surface of the case 41d adjacent to the area where the first application member P1 is applied on the printed circuit board 41a, and the second application member P2 on the printed circuit board 41a is applied. The second application member P2 is applied to the inner surface of the case 41d adjacent to the region. According to such a form of Example 6, it is possible to further increase the effect of the form of Example 1.

[Others]
As described above, the LED array 41 (illumination light emitting device) of the present embodiment is provided in an image reading device that scans an original and reads an image, and yellow (first color) and blue (second color). ) Illuminates the original by emitting mixed light. Further, in the LED array 41, a plurality of blue LED elements 41e (light emitting elements) that emit blue light are arranged on the printed circuit board 41a facing the document so as to be separated in the main scanning direction.

  Furthermore, on the printed circuit board 41a, when the light from the blue LED element 41e hits, the first coating member P1 colored or phosphor-containing so as to emit light of substantially the same color as yellow, and the blue LED element 41e A second application member P2 colored or phosphor-containing so as to emit light of substantially the same color as blue when applied with light is applied. In addition, the LED array 41 includes light that travels from the blue LED element 41e to the document after hitting the first coating member P1, and light that travels from the blue LED element 41e to the document and then travels to the document. It is formed so as to be included in the illumination light.

  Further, the application regions of the first application member P1 and the second application member P2 are set so that the ratio of yellow light and blue light included in the illumination light is leveled in the main scanning direction. . Therefore, according to the LED array 41, there is no need for a means for leveling light unevenness with an optical member such as a diffuser or a means for changing the concentration of the yellow phosphor-containing resin, while suppressing a decrease in illuminance and an increase in manufacturing price. Thus, it is possible to obtain a read image with little color unevenness.

  The blue LED element 41e is sealed with a resin 41c containing a phosphor that emits yellow light. The first application member P1 may contain a phosphor that emits yellow light, and the second application member P2 emits light with a wavelength shorter than yellow (especially blue or a color substantially equivalent to this). You may make it contain the fluorescent substance to do.

  Moreover, as for the 1st application | coating member P1 in Example 4, the thickness of application | coating is thickened as the position near the blue LED element 41e. In addition, instead of increasing the thickness of the coating, the reflectance may be increased. In this case, the same effect as in the case of Example 4 can be obtained. In the second application member P2 in Example 5, the application thickness is increased as the position is farther from the blue LED element 41e. In this case as well, instead of increasing the thickness of the coating, the reflectance may be increased. In this case, the same effect as in the case of Example 5 can be obtained.

  In each embodiment, the blue LED element 41e is surrounded by the inner wall of the case 41d with the resin 41c sealing the blue LED element 41e. In the sixth embodiment, the first coating member P1 is applied to the portion of the inner wall including the positions facing the blue LED elements 41e on both sides in the sub-scanning direction, and the blue LED elements 41e and the main scanning direction are coated. The second application member P2 is applied to a portion including the positions facing both sides of the first application member P2.

  Moreover, in Example 1, the area | region where the 1st application member P1 was apply | coated is an area | region of the both sides of the subscanning direction with respect to the blue LED element 41e, and the area | region where the 2nd application member P2 was apply | coated is the 1st application member. It is a region on both sides in the main scanning direction with respect to the region where P1 is applied. Moreover, in Example 2, the area | region where the 1st application member P1 was apply | coated is the area | region of the both sides of the subscanning direction with respect to the blue LED element 41e, and a surrounding area | region, and the area | region where the 2nd application member P2 was apply | coated is This is an area around the area where the first application member P1 is applied.

  As mentioned above, although the specific example was given and demonstrated about embodiment of this invention, this invention is not limited to the content. The present invention can be implemented in various specific forms without departing from the spirit of the present invention.

  The present invention can be used for a copying machine provided with an image reading apparatus.

DESCRIPTION OF SYMBOLS 1 Document tray 2 Operation panel 3 Automatic document feeder 4 Image reader 5 Printer part 6 Paper discharge tray 7 Paper feed tray 41 LED array (lighting device for illumination)
41a Printed circuit board 41b White LED
41c resin (yellow phosphor-containing resin)
41d case 41e blue LED element 42 platen glass 43 image reading window 45 folding mirror 46 lens 47 line sensor P1 first coating member P2 second coating member

Claims (13)

An illumination light-emitting device that is provided in an image reading device that scans an original and reads an image, emits light in which light of a predetermined first color and second color is mixed, and illuminates the original,
A plurality of light emitting elements that emit light of the second color are arranged on the substrate facing the document so as to be separated in the main scanning direction,
On the substrate, when the light from the light emitting element hits, the first coating member colored or phosphor-containing so as to emit light of substantially the same color as the first color, and the light from the light emitting element When applied, a second application member colored or phosphor-containing so as to emit light of substantially the same color as the second color is applied,
The illumination light includes light that travels from the light emitting element to the original after hitting the first application member and light that travels from the light emitting element to the original after hitting the second application member. Formed,
The application area of each of the first and second application members is:
The illumination light-emitting device, wherein the ratio of the first color light and the second color light contained in the illumination light is set to be leveled in the main scanning direction.   The light emitting device for illumination according to claim 1, wherein the light emitting element is a blue LED element.   The illumination light-emitting device according to claim 2, wherein the first color is yellow.   The light emitting device for illumination according to any one of claims 1 to 3, wherein the light emitting element is sealed with a resin containing a phosphor that emits light of the first color.   The light emitting device for illumination according to claim 4, wherein the first application member contains a phosphor that emits light in the first color.   The illumination light-emitting device according to claim 4, wherein the second application member includes a phosphor that emits light having a shorter wavelength than the first color. The first application member includes
The illumination light-emitting device according to any one of claims 1 to 4, wherein the closer to the light-emitting element, the thicker the coating or the higher the reflectance. The second application member includes
The illumination light-emitting device according to any one of claims 1 to 4, wherein the farther the position from the light-emitting element, the thicker the coating or the higher the reflectance. The light emitting element is surrounded by an inner wall,
5. The illumination light-emitting device according to claim 1, wherein the first application member is applied to a portion of the inner wall that includes a position facing both sides of the light-emitting element in the sub-scanning direction. . The light emitting element is surrounded by an inner wall,
The light emitting device for illumination according to any one of claims 1 to 4, wherein the second coating member is applied to a portion of the inner wall including a position facing both sides of the light emitting element in the main scanning direction. . The area where the first application member is applied is an area on both sides of the light emitting element in the sub-scanning direction,
5. The illumination light-emitting device according to claim 1, wherein the region to which the second application member is applied is a region on both sides in the main scanning direction with respect to the region to which the first application member is applied. The areas where the first application member is applied are areas on both sides in the sub-scanning direction with respect to the light emitting element and surrounding areas,
The light emitting device for illumination according to any one of claims 1 to 4, wherein the region where the second application member is applied is a region around the region where the first application member is applied. It has the light-emitting device for illumination in any one of Claims 1-12,
An image reading apparatus characterized in that the illumination light-emitting device illuminates the original when the original is scanned to read an image.