JP2020156046A - Illumination device, reading device, printing system, and determination device - Google Patents

Abstract

To implement an illumination device capable of improving reliability with a relatively simple configuration.SOLUTION: An illumination device comprises: an exterior panel forming one face of a housing; a light source unit including a light source installed on a board in the housing; a support member supporting the exterior panel and the light source unit in the housing; and a heat radiation member disposed so as to connect the light source unit with the exterior panel. The heat radiation member is configured so that thermal conductance of a second heat radiation path is larger than thermal conductance of a first heat radiation path, where the first heat radiation path is a heat radiation path passing through the support member from the light source unit to the exterior panel and the second heat radiation path is a heat radiation path passing through the heat radiation member from the light source unit to the exterior panel.SELECTED DRAWING: Figure 3

Description

The present invention mainly relates to a lighting device.

Some reading devices represented by a contact image sensor or the like are provided with a lighting device, and the lighting device irradiates the reading target with light to detect the reflected light from the reading target (see Patent Document 1). A light emitting element such as an LED (Light Emitting Diode) is used as the light source of the lighting device. The light source generally generates heat as it emits light.

Japanese Unexamined Patent Publication No. 9-8264

By the way, the heat generated by the light source may affect the amount of emitted light, the product life, etc., and may cause a decrease in the reliability of the lighting device. On the other hand, for the support member that supports the components in the lighting device, for example, a material having a relatively low thermal conductivity may be used for the purpose of reducing the size and weight of the device, so that heat dissipation is taken into consideration. Design is required.

The present invention has been made with the inventor's recognition of the above problems as an opportunity, and an exemplary purpose is to realize a lighting device capable of improving reliability with a relatively simple configuration.

One side surface of the present invention relates to a lighting device, and the lighting device includes an exterior panel forming one surface of a housing, a light source unit in which a light source is installed on a substrate in the housing, and a light source unit in the housing. A support member for supporting the exterior panel and the light source unit, and a heat radiating member arranged so as to connect the light source unit and the exterior panel are provided, and the light source unit passing through the support member to the exterior panel is provided. When the heat radiation path is the first heat radiation path and the heat radiation path from the light source unit passing through the heat radiation member to the exterior panel is the second heat radiation path, the heat radiation member has the thermal conductance of the second heat radiation path. It is characterized in that it is configured so as to be larger than the thermal conductance of the first heat dissipation path.

According to the present invention, the reliability of the lighting device can be improved.

The perspective view for demonstrating an example of the structure of a reading apparatus. Exploded view for explaining an example of the structure of a reader. FIG. 3 is a cross-sectional perspective view for explaining an example of the structure of the reading device. FIG. 5 is a cross-sectional view for explaining an example of the internal structure of the reader. The perspective view for demonstrating an example of the structure of a heat radiating member. The perspective view for demonstrating another example of the structure of a heat radiating member. The perspective view for demonstrating another example of the structure of a heat radiating member. A block diagram for explaining a configuration example of a printing system.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. The following embodiments do not limit the invention according to the claims. Although a plurality of features are described in the embodiment, not all of the plurality of features are essential for the invention, and the plurality of features may be arbitrarily combined. Further, in the attached drawings, the same or similar configurations are designated by the same reference numbers, and duplicate description is omitted.

FIG. 1 is a perspective view showing the configuration of the reading device 1 according to the embodiment. As can be seen from FIG. 1, the reading device 1 has an elongated outer shape extending in one direction. In the figure, the X, Y, and Z directions intersecting each other are shown for easy understanding of the structure. The X direction corresponds to the longitudinal direction or the width direction of the device 1. The Y direction corresponds to the lateral direction or the depth direction of the device 1. Further, the Z direction corresponds to the vertical direction or the height direction of the device 1.

The reading device 1 includes a housing 10 and a top plate 11. The housing 10 forms the exterior of the device 1, and includes a pair of exterior panels 101 arranged laterally in the X direction and a pair of exterior panels 102 arranged laterally in the Y direction. That is, the individual exterior panels 101 form one side portion in the X direction, and the individual exterior panels 102 form one side portion in the Y direction. Here, for the exterior panels 101 and 102, a material having a relatively high thermal conductivity, for example, a metal such as aluminum or iron may be used.

The top plate 11 is a plate material arranged above the device 1, and a reading surface F1 is formed on the upper surface thereof. A translucent material such as glass may be used for the top plate 11. Although the details will be described later, the reading device 1 reads information from the reading target by scanning the reading surface F1 with an object such as a sheet or a document (hereinafter referred to as “reading target”) in the Y direction. be able to.

FIG. 2 is an exploded perspective view for explaining the internal structure of the reading device 1. The reading device 1 further includes a support member 12, a lens unit 13, a light source unit 14, a heat radiating member 15, and a sensor unit 16, which are installed in a housing 10. Although the details will be described later, the support member 12 supports each component or component of the device 1 in the housing 10.

The lens unit 13 guides the light from the reading target (reflected light accompanying the irradiation by the light source unit 14 described later) incident through the top plate 11 downward. The lens unit 13 may be composed of known optical elements, and in the present embodiment, the lens unit 13 is a rod lens array in which a plurality of rod lenses are arranged in the X direction.

The light source unit 14 is a unit for irradiating a reading target with light, and a plurality of light sources 141 are arranged in the X direction on a long substrate 140. A known light emitting element such as an LED (Light Emitting Diode) may be used as the light source 141. Concomitantly, an electronic component 142 for driving the light source 141 may be mounted on the substrate 140. As another embodiment, the light source unit 14 may include a single light source 141 and a rod-shaped light guide member configured to guide the light in the longitudinal direction and emit it upward. .. Further, in this embodiment, a pair of light source units 14 are installed on both sides of the lens unit 13 in the Y direction, but another embodiment may be a single light source unit 14.

A pair of heat radiating members 15 are installed corresponding to the pair of light source units 14. Although the details will be described later, the heat radiating member 15 is a plate material for realizing heat radiating from the light source unit 14, and as the material thereof, a material having a relatively high thermal conductivity, for example, a metal such as aluminum or iron, is used. Can be used.

The sensor unit 16 is a unit for detecting the light guided by the lens unit 13, and the line sensor 161 is mounted on a long substrate 160. The line sensor 161 may be located below the lens unit 13. As the line sensor 161, a known one in which a plurality of photoelectric conversion elements are arranged, for example, a CCD / CMOS image sensor may be used.

The exterior panels 101 and 102, the top plate 11, the lens unit 13, the light source unit 14, the heat radiating member 15, and the sensor unit 16 are supported and fixed by the support member 12. For the support member 12, it is preferable to use a material having desired rigidity, relatively light weight, and advantageous for molding, for example, a resin such as polypropylene resin, whereby, for example, for miniaturization and weight reduction of the apparatus 1. It will be advantageous. In the present embodiment, the support member 12 can mount the top plate 11 on the upper side, hold the lens unit 13, attach the exterior panels 101 and 102 from the side, and attach the sensor unit 16 from below. Can be molded into a shape that For example, as can be seen from FIG. 1, the exterior panel 102 is fixed to the support member 12 by using the fixing member 191 from the side in the Y direction. In the present embodiment, fastening members such as screws and bolts are used for the fixing member 191.

FIG. 3 is a cross-sectional perspective view for explaining the internal structure of the reading device 1 (the YZ plane passing through the fixing member 191 is a cross section), and FIG. 4 is an end view thereof. The support member 12 includes a body portion 120, a pillar portion 121, an upward extending portion 122, an edge portion 123, a downward extending portion 124, and a bottom portion 125. In the present embodiment, the support member 12 is configured to be symmetrical from the viewpoint in the X direction (longitudinal side view), but it may be partially changed.

The body portion 120 functions as a holding portion configured so that the lens unit 13 can be held in the housing 10. The pillar portion 121 is a columnar portion extending in the Y direction from the side of the body portion 120, and is configured so that the fixing member 191 (here, the fastening member) is inserted and screwed. The upper extension portion 122 is a portion extending upward from the upper side of the body portion 120. The edge portion 123 is a part of the upper portion of the support member 12 and is a portion forming a frame portion on which the top plate 11 can be placed. An opening OP12 is formed between the upward extending portion 122 and the edge portion 123. The downward extension portion 124 is a portion extending downward from the lower side of the body portion 120. Further, the bottom portion 125 is a portion extending further in the Y direction and outward from the downward extending portion 124.

Here, as shown in FIG. 2, a plurality of pillar portions 121 are provided corresponding to the fixing positions by the fixing member 191. Further, as shown in FIG. 2, the support member 12 further includes one or more (three in this case) beam portions 126. The single beam portion 126 extends in the Z direction between two pillar portions 121 adjacent to each other, and is used for fixing the light source unit 14 and the heat radiating member 15 as described in detail later.

Referring again to FIGS. 3 and 4, the heat radiating member 15 includes a mounting portion 151, an extension portion 152 and a contact portion 153. The mounting portion 151 is a flat surface portion on which the light source unit 14 can be mounted. The extension portion 152 is a portion extending from the mounting portion 151 toward the exterior panel 102. The contact portion 153 is a portion that extends from the extension portion 152 along the inner wall of the exterior panel 102 and abuts on the inner wall.

The heat radiating member 15 is inserted into the opening OP12 from above and assembled to the support member 12, for example, with the light source unit 14 mounted on the mounting portion 151. At the time of this assembly, the heat radiating member 15 abuts on the inner wall of the exterior panel 102 at the contact portion 153 and is fastened together with the pillar portion 121 of the support member 12 by the fixing member 191 (here, the fastening member). The light source unit 14 may be mounted on the mounting portion 151 after the heat radiating member 15 is assembled.

In the state where the heat radiating member 15 is assembled, both the upward extending portion 122 and the edge portion 123 are in contact with the light source unit 14 and / or the mounting portion 151, and the opening OP12 is the light source unit 14 and / or the mounting portion. It is blocked by 151. With such a configuration, the light source unit 14 and / or the mounting portion 151 is supported by the support member 12.

Here, due to the closure of the opening OP12, a space substantially sealed by the top plate 11, the support member 12, the lens unit 13, the light source unit 14, and the mounting portion 151 is created in the upper portion inside the housing 10. It is partitioned. In the present embodiment, since the heat radiating member 15 extends downward without passing through this space, this space is maintained in an appropriately sealed state, and thus foreign matter such as dust and dirt is mixed in this space. There is nothing to do.

Here, the heat radiating member 15 may be configured to have desired flexibility (with a material, thickness, and dimensions that are more easily deformed by the support member 12). In other words, the support member 12 may be made of a material having a higher rigidity than the heat dissipation member 15. As a result, the heat radiating member 15 is fixed so that the contact portion 153 presses the inner wall of the exterior panel 102. As a result, both the contact on the inner wall of the exterior panel 102 and the closure of the opening OP12 can be appropriately realized.

In this way, the light source unit 14 is fixed in the housing 10, and the light emitted from the light source unit 14 passes through the top plate 11 and is irradiated to the reading target (not shown) above the top plate 11. .. Then, the reflected light from the reading target passes through the top plate 11 and is guided downward by the lens unit 13.

The sensor unit 16 is assembled to the bottom 125 of the support member 12 (for example, fixed by fastening, adhesion, etc.), and the light guided by the lens unit 13 is detected by the line sensor 161. The sensor unit 16 further includes a terminal portion 162 on the lower surface of the substrate 160, and an electric signal indicating a detection result by the line sensor 161 can be output from the terminal portion 162 to the outside. In addition to the signal terminal for outputting the electric signal, the terminal portion 162 also includes a power supply terminal for receiving electric power.

In summary, the reflected light from the reading target irradiated by the light source unit 14 is guided to the sensor unit 16 by the lens unit 13 and detected. With such a configuration, the reading device 1 reads information from the reading target and outputs an electric signal indicating the result to the outside.

FIG. 5 is a perspective view showing one light source unit 14 and the corresponding heat radiating member 15. As described above (see FIG. 2), the light source unit 14 is formed by arranging a plurality of light sources 141 on the substrate 140 in one direction (here, the X direction). Here, the details will be described later, but in the present embodiment, the substrate 140 has a hole OP14. One or more holes OP14 (three in this case) are provided, and a single hole OP14 is provided between two light sources 141 adjacent to each other.

As described above (see FIGS. 3 and 4), the heat radiating member 15 includes a mounting portion 151, an extending portion 152, and a contact portion 153. The contact portion 153 has one or more holes OP15A (here, four) for inserting the fixing member 191 (here, the fastening member), whereby the heat radiating member 15 can be fastened together with the exterior panel 102. ing.

Further, the mounting portion 151 has a hole portion OP15C (here, three) at a position corresponding to the hole portion OP14 (a position below the hole portion OP14). Similarly, the extension portion 152 and the contact portion 153 have slit portions SL15 (here, three) at positions corresponding to the hole portions OP14. The slit portion SL15 prevents the heat radiating member 15 from interfering with the beam portion 126 (see FIG. 2). The light source unit 14 and the heat radiating member 15 are fixed to the beam portion 126 of the support member 12 by the fixing member 192 inserting the hole portion OP14, the hole portion OP15B, and the slit portion SL15. Fastening members such as screws and bolts are used for the fixing member 192. That is, the fixing member 192 fixes the light source unit 14 and the support member 12 to each other together with the heat radiating member 15 by inserting the hole OP14, the hole OP15B and the slit SL15 and screwing them in the beam portion 126.

Further, the mounting portion 151 further has an opening OP15C, and the extending portion 152 further has an opening OP15D. A wire (not shown) for supplying electric power to the light source 141 is connected to the light source unit 14. This wire extends downward from the heat radiating member 15 by inserting the openings OP15C and OP15D.

By the way, the light source unit 14 generally generates heat as it emits light. The heat generated by the light source unit 14 may affect the amount of emitted light, the product life, and the like, which may cause a decrease in the reliability of the device 1. In the present embodiment, the device 1 is made smaller and lighter by using a resin having a relatively low thermal conductivity as the material of the support member 12. Therefore, in such a configuration, it is required to appropriately guide the heat generated by the light source unit 14 to the housing 10 and release it to the external environment (outside the housing 10).

Referring to FIG. 4 again, the heat radiating member 15 is arranged so as to connect the light source unit 14 and the exterior panel 102. In this structure, as a heat dissipation path from the light source unit 14 to the exterior panel 102, at least a path R1 passing through the support member 12 (first heat dissipation path) R1 and a path passing through the heat dissipation member 15 (second heat dissipation path) R2. Two heat dissipation paths will be formed. The heat radiating member 15 is configured so that the thermal conductance of the heat radiating path R2 is larger than the thermal conductance of the heat radiating path R1 (the thermal resistance of the path R2 is smaller than the thermal resistance of the path R1). In the structure using resin for the support member 12, a metal such as aluminum or iron, particularly aluminum, is preferably used for the heat radiating member 15, and the heat radiating member 15 is provided so as to satisfy desired rigidity, flexibility and the like. The length, thickness, width, etc. may be determined.

According to this structure, the heat generated by the light source unit 14 is guided to the housing 10 and appropriately released to the external environment. Further, since it is not always necessary to use a material having high thermal conductivity for the support member 12, the reliability of the device 1 can be easily made with a relatively simple configuration while realizing miniaturization and weight reduction of the device 1. It is possible to improve.

Further, as can be seen from FIG. 5, the heat radiating member 15 has a long shape extending in the X direction, whereby the thermal conductance of the heat radiating path R2 can be increased. Therefore, the heat generated by the light source unit 14 is easily transferred to the exterior panel 102 via the mounting portion 151, the extending portion 152, and the contact portion 153.

Further, as can be seen from FIG. 5, the extension portion 152 and the contact portion 153 have a shape separated into a plurality of (here, four) portions 15P1 to 15P4 by the slit portion SL15. Of these, the portions 15P1 and 15P4 at both ends in the X direction are preferably smaller in the width in the X direction than the other portions 15P2 and 15P3. As a result, it is possible to improve the heat dissipation performance of the central portion of the light source unit 14, which tends to retain heat. Accordingly, when the device 1 reads the reading target, it is possible to improve the reading accuracy of the central region of the reading result, which is relatively easy to attract attention.

In addition, the configuration of the heat radiating member 15 is not limited to the example of FIG. 5, and various changes can be made without departing from the above-mentioned purpose.

As an example, as shown in FIG. 6, an adhesive member 193 such as double-sided tape may be arranged between the light source unit 14 and the corresponding heat radiating member 15. That is, the adhesive member 193 is interposed between the mounting portion 151 of the heat radiating member 15 and the light source unit 14, and fixes them to each other. According to the example of FIG. 6, the light source unit 14 is fixed to the mounting portion 151 by the adhesive member 193. Therefore, when the light source unit 14 is mounted on the mounting portion 151 and the heat radiating member 15 is assembled to the support member 12, the light source unit 14 does not come off from the mounting portion 151, so that the heat radiating member 15 is opened. It becomes easy to insert it from the OP 12 and assemble it to the support member 12.

The adhesive member 193 is provided with holes OP193A and OP193B, respectively, so as to correspond to the holes OP15B and OP15C of the mounting portion 151. As a result, the fixing member 192 is not prevented from inserting the hole OP14, the hole OP15B, and the slit SL15.

In order to suppress a decrease in thermal conductance (increase in thermal resistance) of the heat dissipation path R2 due to the interposition of the adhesive member 193 between the light source unit 14 and the heat radiation member 15, the adhesive member 193 is sufficiently thin and / Alternatively, it may be partially provided.

As another example, as shown in FIG. 7A, a heat radiating member 15'may be used instead of the heat radiating member 15. The heat radiating member 15'includes a holding portion 151'instead of the mounting portion 151, whereby the light source unit 14 can be held so as to come into contact with the upper surface of the light source unit 14. An adhesive member for fixing them to each other may be provided between the light source unit 14 and the holding portion 151'.

In a configuration in which the light sources 141 are arranged on the upper surface of the substrate 140, in many cases, the light source unit 14 is more likely to generate heat on the upper surface than on the lower surface. Therefore, according to the example of FIG. 7A, it may be more advantageous for heat dissipation of the light source unit 14.

Further, in the example of FIG. 7A, the holding portion 151'is provided with the hole portion OP15B' corresponding to the hole portion OP15B. As a result, the fixing member 192 can be inserted as in the above-mentioned structure (structure of FIGS. 1 to 5). Further, the holding portion 151'is further provided with a hole portion OP15E'for exposing the light source 141 and / or the electronic component 142. As a result, the light from the light source 141 to the reading target is not obstructed. In the example of FIG. 7A, since the wire for supplying electric power to the light source 141 does not interfere with the holding portion 151', the hole portion corresponding to the hole portion OP15C can be omitted.

As yet another example, as shown in FIG. 7B, the heat radiating member 15 "may be used instead of the radiating member 15. The radiating member 15" is held in place of the mounting portion 151. The light source unit 14 can be held so as to be in contact with both the upper surface and the lower surface of the light source unit 14, that is, the holding unit 151 ”is substantially the same from the viewpoint in the X direction. It has a U-shape. Even with such a configuration, the same effect as the example of FIG. 7A can be realized. An adhesive member may be provided between the light source unit 14 and the holding portion 151 "to fix them to each other.

The holding portion 151 "is provided with a hole portion OP15B corresponding to the hole portion OP15B. As a result, the fixing member 192 can be inserted as in the above-mentioned structure (structure of FIGS. 1 to 5). Further, the holding portion 151 "is further provided with a hole portion OP15E" for exposing the light source 141 and / or the electronic component 142. As a result, the light from the light source 141 to the reading target is not obstructed. Further, although not shown here, it is preferable to provide a hole portion corresponding to the hole portion OP15C so that the wire for supplying electric power to the light source 141 does not interfere with the holding portion 151 ”.

As described above, the heat radiating member 15 is arranged so as to connect the light source unit 14 and the exterior panel 102. In such a structure, at least two heat dissipation paths R1 from the light source unit 14 passing through the support member 12 to the exterior panel 102 and a heat dissipation path R2 from the light source unit 14 passing through the heat dissipation member 15 to the exterior panel 102. A route is formed. The heat radiating member 15 is configured so that the heat conductance of the heat radiating path R2 is larger than the heat conductance of the heat radiating path R1. As a result, the heat generated by the light source unit 14 is guided to the housing 10 and appropriately released to the external environment. Further, as the support member 12, a member suitable for supporting the component or component of the device 1 (for example, a desired member from the viewpoint of weight, rigidity, moldability, etc.) may be selected, and heat conduction is not necessarily required. It is not necessary to use a highly resistant material. Therefore, according to this configuration, it is possible to easily improve the reliability of the device 1 with a relatively simple configuration.

In the embodiment, a resin (for example, polypropylene resin) is used for the support member 12, and a metal (for example, aluminum) is used for the heat dissipation member 15, but the present invention is not limited to this. That is, the heat radiating member 15 may be made of a material having a higher thermal conductivity than the supporting member 12 in order to improve the heat radiating efficiency. For example, the thermal conductivity of the material constituting the heat radiating member 15 is preferably twice or more, preferably 5 times or more, and more preferably 10 times or more the thermal conductivity of the material constituting the support member 12. ..

The reading device 1 is not limited to the configuration exemplified in the present specification, and various changes can be made without departing from the gist thereof. For example, although the device 1 has a long outer shape in the embodiment, the width in the X direction may be relatively small due to its miniaturization, weight reduction, etc. (for example, 50 cm or less, 40 cm or less, (30 cm or less), and may be realized with a substantially square outer shape. Accordingly, the quantity of the fixing members 191 and 192 and the quantity of the corresponding elements (for example, pillar portion 121, beam portion 126, etc.) may be changed.

The contents of the above embodiments relate to heat dissipation of the light source unit 14, and although heat dissipation in the structure of the reading device 1 including the sensor unit 16 has been described here, the present invention is not limited to this example. That is, the content of the above embodiment can be applied to a lighting device including a light source unit 14 (also applicable to a device not provided with a sensor unit 16). Further, such a lighting device can be widely applied to various devices for the purpose of lighting / lighting, such as a lighting device provided on the ceiling of a room and a desk lamp for a tabletop. In other words, the lighting device can be said to be a concept including not only a device having a lighting function as a main purpose but also a device having the lighting function as an auxiliary function (reading device 1 according to the embodiment).

FIG. 8 shows a configuration example of the printing system SY to which the reading device 1 is applied. In addition to the reading device 1, the printing system SY further includes an image forming device 2, a processor 3, and a transport mechanism 4. The image forming apparatus 2 is a printing apparatus such as an inkjet printer, a laser printer, and an MFP (multifunction printer), and may be referred to as a recording apparatus or the like. The image forming apparatus 2 forms an image on the recording medium P conveyed by the conveying mechanism 4 based on the print data from the processor 3. The reading device 1 is arranged on the downstream side of the image forming device 2 (downstream in the transport direction of the recording medium P), and reads the image on the recording medium P formed by the image forming device 2. The processor 3 receives the reading result by the reading device 1, and notifies the user that it is necessary to correct the driving force of the image forming device 2 or redo the image forming by the image forming device 2 based on the reading result. It is also possible to do.

The processor 3 can also function as a determination unit that makes a predetermined determination based on the reading result of the reading device 1, that is, it is also possible to evaluate whether or not the reading result satisfies the criteria. In this case, the system SY can be expressed as a determination device (determination system), an evaluation device (evaluation system), or the like. That is, the above-mentioned reading device 1 or a lighting device which is a part thereof is used for acquiring image data to be inspected or evaluated, for example, for authenticity determination of banknotes, quality inspection of foods, etc., and has various uses. It can be said that it can be applied to.

It should be noted that the individual terms described herein are merely used for the purpose of explaining the present invention, that is, the present invention is not limited to the strict meaning of the terms. For example, the word device may be expressed as a unit / assembly / device / module or the like, and vice versa.

The invention is not limited to the above embodiments, and various modifications and modifications can be made without departing from the spirit and scope of the invention. Therefore, a claim is attached to make the scope of the invention public.

1: Reading device (including lighting device), 10: Housing, 101-102: Exterior panel, 12: Support member, 14: Light source unit, 15: Heat dissipation member.

Claims (18)

The exterior panel that forms one side of the housing and
A light source unit in which a light source is installed on a substrate in the housing,
A support member that supports the exterior panel and the light source unit in the housing, and
A heat radiating member arranged so as to connect the light source unit and the exterior panel is provided.
When the heat dissipation path from the light source unit passing through the support member to the exterior panel is the first heat dissipation path, and the heat dissipation path from the light source unit passing through the heat dissipation member to the exterior panel is the second heat dissipation path.
The lighting device is characterized in that the heat radiating member is configured such that the heat conductance of the second heat radiating path is larger than the heat conductance of the first heat radiating path. The lighting device according to claim 1, wherein the support member is made of a material having a higher rigidity than the heat radiation member. The lighting device according to claim 1 or 2, wherein the heat radiating member is made of a material having a thermal conductivity higher than that of the support member. The lighting device according to claim 3, wherein the thermal conductivity of the material constituting the heat radiating member is at least twice the thermal conductivity of the material constituting the support member. The lighting device according to any one of claims 1 to 4, wherein the support member is made of a resin. The lighting device according to any one of claims 1 to 5, wherein the heat radiating member is made of metal. The lighting device according to any one of claims 1 to 6, wherein the exterior panel is made of metal. The substrate is a long substrate extending in one direction, and the light source is one of a plurality of light sources.
The light source unit is formed by arranging the plurality of light sources in the one direction on the long substrate.
The lighting device according to any one of claims 1 to 7, wherein the support member, the exterior panel, and the heat radiating member are extended in one direction. The heat radiating member is
The mounting portion on which the light source unit is mounted and
An extension part extending from the above-mentioned place part to the exterior panel,
A contact portion extending from the extension portion along the inner wall of the exterior panel and abutting on the inner wall,
The lighting device according to any one of claims 1 to 8, wherein the lighting device comprises. A plurality of fixing members for fixing the light source unit and the support member to each other are further provided.
The lighting device according to claim 9, wherein the heat radiating member has a plurality of slit portions for inserting the plurality of fixing members, at least in the extending portion. The plurality of fixing members are arranged in one direction, and the extending portion is separated into a plurality of portions in the one direction by the plurality of slit portions.
The lighting device according to claim 10, wherein the portions at both ends in the one direction of the plurality of portions have a width smaller in the one direction than the other portions. In the housing, the light source unit mounted on the above-described mounting portion and / or the heat radiating member is supported by the supporting member, and the contact portion presses the inner wall of the exterior panel. The lighting device according to any one of claims 9 to 11, wherein the lighting device is fixed as described above. A top plate capable of emitting light from the light source from the light source unit is further provided.
A ninth to claim, wherein a space is partitioned between the light source unit, the support member, and the top plate in the housing, and the heat radiating member is arranged so as not to pass through the space. The lighting device according to any one of 12. A wire for supplying electric power to the light source is connected to the light source unit.
The lighting device according to claim 13, wherein the heat radiating member has an opening through which the wire is inserted. A reading device according to any one of claims 1 to 14, further comprising a sensor unit for detecting reflected light from an object illuminated by the lighting device. Further provided with a lens unit for guiding the reflected light,
The reading device according to claim 15, wherein the sensor unit and the lens unit are fixed to the support member. Image forming device and
A printing system comprising the reading device according to claim 15 or 16, wherein the image formed by the image forming device is arranged so as to be readable. A predetermined lighting device according to any one of claims 1 to 14, a sensor unit for detecting reflected light from an object illuminated by the lighting device, and a detection result by the sensor unit. A determination device including a determination unit for determining the above.