TWI482323B - A light emitting device and an image reading device - Google Patents

Description

Light emitting device and image reading device

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

Patent Document 1 discloses an image reading apparatus that transmits thermal energy generated by an LED (Light Emitting Diode) to a conduction portion, transmits it from a conduction portion to a heat dissipation portion, and further faces from the heat dissipation portion. The air flowing in the sheet conveying path dissipates heat, and the heat can be dissipated more efficiently with a simple structure.

[Previous Technical Literature] [Patent Literature]

Patent Document 1: Japanese Patent Laid-Open Publication No. 2010-109563

SUMMARY OF THE INVENTION An object of the present invention is to provide a light-emitting device which can efficiently discharge thermal energy around a light-emitting member as compared with the case without the present structure.

[1] A light-emitting device comprising: one or more light-emitting members; and a substrate having a support portion that supports the light-emitting members, and a plurality of vent holes are provided between the support portions.

[2] The light-emitting device according to [1], wherein one or more of the plurality of vent holes are provided in a direction opposite to the light-emitting member position.

[3] The light-emitting device according to [1], wherein the plurality of light-emitting members are provided in plurality, and the plurality of second vent holes in the plurality of vent holes are provided between the plurality of light-emitting members.

[4] The light-emitting device according to [3], wherein the substrate is composed of a plurality of layers, and an electric conductor is formed on a part of a surface of each of the layers, and the second vent hole is provided in each of the layers on which the substrate is formed. An electric conductor is formed on the surface of the second vent hole at the position of the electric conductor.

[5] The light-emitting device according to [3], wherein, in the plurality of second vent holes, a size of the second vent hole close to the light-emitting member is larger than a second vent hole that is farther from the light-emitting member size of.

[6] An image reading apparatus comprising: a frame; and an image reading unit that reads an image formed on the document, wherein the image reading unit includes one or more light-emitting members. Emitting light to the original; a substrate having a support portion for supporting the light-emitting member, and a plurality of vent holes between the support portions; and a light-receiving member that receives reflected light of the light emitted from the light-emitting member on the original .

[7] The image reading device according to [6], further comprising a guiding member supported on the frame for guiding the image reading device in the housing, the image reading The portion moves along the guiding member when reading an image formed on the original.

[8] The image reading device according to [7], wherein the substrate is relatively The above-described guiding member is vertically disposed in the above-described image reading apparatus.

According to [1], it is possible to provide a light-emitting device which can efficiently discharge thermal energy around the light-emitting member as compared with the case without the present structure.

According to [2], it is possible to provide a light-emitting device which can discharge heat energy more efficiently than the case without the present structure, in addition to the effect obtained by the light-emitting device of [1].

According to [3], it is possible to provide a light-emitting device which can discharge heat energy more efficiently than the case without the present structure, in addition to the effect obtained by the light-emitting device of [1].

According to [4], it is possible to provide a light-emitting device which can electrically connect the respective layers of the substrate via the vent holes in addition to the effects obtained by the light-emitting device of [3].

According to [5], it is possible to provide a light-emitting device which can maintain the strength of the substrate in addition to the effect obtained by the light-emitting device of [3].

According to [6], it is possible to provide an image reading apparatus which can efficiently discharge thermal energy around the light-emitting member as compared with the case without the present structure.

According to [7], it is possible to provide an image reading apparatus which can discharge heat more efficiently than the case where the image reading apparatus of [6] is obtained, compared to the case where the structure is not provided. After the air.

According to [8], it is possible to provide an image reading apparatus which is different from the one which does not have the present structure, except for the effect obtained by the image reading apparatus of [7] In this case, the heated air can be discharged more efficiently.

Hereinafter, the present embodiment will be described based on the drawings.

Fig. 1 is a view showing an outline of an image forming apparatus 10 of the present embodiment. In addition, FIG. 2 shows the image reading apparatus 100.

The image forming apparatus 10 includes an image reading apparatus 100 and an image forming unit 12 that performs image formation based on image information read by the image reading apparatus 100.

The image forming unit 12 is, for example, an electrophotographic member, and has a sheet storage container 16 that accommodates a sheet (recording medium) in a placed state, and a sheet that is supplied from the sheet storage container 16 to the sheet conveyance path 20 An image is formed on it.

The image forming portion 12 has an image forming portion body 14 in which an image holding body 22 is mounted, which uses, for example, a photosensitive drum, and a charger 24 that uniformly charges the image holding body 12. An exposure device 26 that forms a latent image on the image holding body 22 that is uniformly charged by the charger 24; a developing device 28 that is formed on the image holding body 22 by the exposure device 26 using toner The latent image is visualized; a primary transfer device 32 that transfers the toner image formed by the developing device 28 onto the intermediate transfer belt 30 used as the intermediate transfer body; and the photoconductor cleaner 34 It removes the toner remaining on the image holding body 22.

Further, a second transfer device 38 that transfers the toner image transferred onto the intermediate transfer belt 30 to the sheet is mounted in the image forming portion main body 14. Upper fixing device 40 which fixes the sheet transferred onto the sheet onto the sheet; and intermediate transfer belt cleaner 44 which cleans the intermediate transfer belt 30.

Further, for example, an operation panel 302 used as a user interface is attached to, for example, the front view side of the image forming unit body 14.

On the right side surface side of the image forming portion main body 14, for example, a discharge portion 42 that can discharge a sheet on which image formation has been completed is attached.

The exposure device 26 is, for example, a laser scanning type member that converts image information of a document read by a photoelectric conversion element 138 (FIG. 4) to be described later included in the image reading device 100 into a laser on/off. (on-off) the signal and output it.

The developing device 28 is, for example, a rotary type member, and has developing devices 36a, 36b, 36c, and 36d of four colors of Y (yellow), M (magenta), C (cyan), and K (black), which are disposed, for example, in the above developing device. The periphery of 28 is rotated in such a manner as to face the image holding body 22 when developing various colors.

The primary transfer device 32 is constituted, for example, by a corotron, and the toner image of four colors is transferred onto the intermediate transfer belt 30 by the primary transfer device 32. The toner image transferred onto the intermediate transfer belt 30 is transferred onto the sheet by the secondary transfer device 38, and the sheet is conveyed to the fixing device 40, and the toner is fixed by the fixing device 40. The image is fixed on the sheet, and the sheet after the toner image is fixed is discharged from the discharge portion 42. The toner remaining on the intermediate transfer belt 30 is scraped off by the intermediate transfer belt cleaner 44.

The operation panel 302 can select to form a monochrome image composed of, for example, black monochromatic toner in the image forming portion 12, or to form a color tone such as yellow, magenta, cyan, or black. A multi-color image formed by the agent, or a plurality of operation modes such as magnification and image quality of the set image. Further, the operation panel 302 can select a setting of an original reading area which is an area when the image reading apparatus 100 reads an original, or a plurality of scanning speeds (magnification) of the original reading by the image reading apparatus 100, black and white reading or A plurality of operation modes such as color reading, original document transfer method, and setting of a document size having a plurality of sizes.

A vesist roll 46 is disposed on the sheet conveying path 20. The resist roller 46 is controlled to temporarily stop the supplied sheet, and the sheet is applied to the secondary transfer device 38 in synchronization with the timing at which the toner image is formed on the intermediate transfer belt 30.

The image reading device 100 has a platen member 106 which is used as a penetrating portion for penetrating light, and is formed of a light-transmitting material such as glass. Further, the image reading apparatus 100 has a reading table 104 for placing the original document D, and a platen cover portion 110 which is openably and closably provided on the reading table 104 and used as an opening and closing portion.

The reading table 104 is formed as a casing, and an image reading unit 130 (image reading unit) is attached to the reading table 104, and the document placed on the platen member 106 is irradiated with light according to the irradiation. The reflected light of the light original reads the image formed on the original.

The image reading unit 130 is movably guided by the support table 104 Supported by member 108. When reading the image formed on the original, the image reading unit 130 moves along the guiding member 108 in the sub-scanning direction in the reading table 104 as indicated by an arrow A in FIG. 2 . Thereby, the image reading unit 130 can read the document while moving in the sub-scanning direction while reading the image of the document placed on the platen member 106.

Further, in the plate cover member 110, a document conveying device 160 that automatically conveys the document D is attached. The image reading apparatus 100 includes a function of reading the document D conveyed by the document conveying device 160 and reading the document D placed on the upper surface of the platen member 106.

The details of the image reading unit 130 are shown in FIGS. 3 and 4. 3 is a perspective view of the image reading unit 130, and FIG. 4 is a cross-sectional view taken along line B-B of FIG. 3.

The image reading device 130 is provided with: a light-emitting device 150; a light guide 132 that guides light from the plurality of light-emitting members 50; reflectors 134a to 134f such as mirrors; an imaging lens 136; and a light-receiving element Photoelectric conversion element 138; and sliding member 144.

The sliding member 144 causes the guiding member 108 to slide by passing the guiding member 108 through the cylindrical portion of the sliding member 144. Thereby, the image reading unit 130 can move in the sub-scanning direction.

The light-emitting device 150 is composed of a plurality of light-emitting members 50 and a substrate 60 that supports the plurality of light-emitting members 50.

The light emitting member 50 is, for example, an LED (Light Emitting Diode) LED chip of a light-emitting element such as a diode.

The substrate 60 is formed of an electrically insulating material such as an epoxy resin and supported on a substrate supporting member 140 such as a carrier. The substrate 60 is attached to the substrate supporting member 140 by a bolt 140a, and can be detached when the light emitting member 50 is replaced.

The substrate 60 is vertically disposed on the image reading device 100 with respect to the guiding member 108, and a vent hole (described later) formed on the substrate 60 is provided in parallel with the moving direction of the image reading unit 130. Here, the vertical system has a substantially vertical meaning, and the parallel system has a substantially parallel meaning.

The photoelectric conversion element 138 is supported on the photoelectric conversion element supporting member 142.

The light emitted from the plurality of light-emitting members 50 is irradiated to the entire main scanning direction of the original placed above the platen member 106 by the light guide 132.

The reflected light of the light irradiated onto the original is reflected by the reflecting plate 134 and then incident on the imaging lens 136 to be imaged.

The photoelectric conversion element 138 is, for example, a 3-line color CCD (charged-coupled device) that receives reflected light at an imaging position of the light reflected by the imaging lens 136 by, for example, RGB (red green blue; red green blue) The photodiodes of the respective filters (primary color filters) output an analog electrical signal corresponding to the respective amounts of RGB of the pixel units to a processing circuit (not shown).

A light emitting device 150 is shown in FIG.

In addition, in FIG. 6, the detail of the light-emitting member 50 is shown, and the detail of the board|substrate 60 is shown in FIG. Fig. 9 is a cross-sectional view taken along line C-C of Fig. 7;

A plurality of light emitting members 50 are arranged in the longitudinal direction (main scanning direction) of the substrate 60.

The light emitting member 50 has a wafer frame 502 formed of, for example, a silicone resin, a lead frame 504 formed of, for example, copper or silver, and a light emitting element 510, which is, for example, a white LED element. When the temperature of the ambient air rises due to heat generation of the light-emitting element 510 or the like, the temperature of the light-emitting element 510 itself rises, and the color characteristics of the light-emitting element 510 deteriorate.

The light emitting member 50 is mounted on the substrate 60 by mounting the lead frame 504 of the light emitting member 50 on the support portions 602a, 602b formed on the substrate 60.

The support portions 602a, 602b may also be formed of a conductive material. For example, the support portion 602a (or the support portion 602b) may have a potential of 24V, and the support portion 602b (or the support portion 602a) may have a potential of 0V.

A conductive paint 604 as an electrical conductor is applied to the substrate 60.

Further, a plurality of vent holes 610, 612, 614, and 616 are formed on the substrate 60 for discharging the heated air, for example, when the air around the light-emitting member 50 is heated by the heat of the light-emitting member 50. To the opposite side of the substrate 60 (the side on which the light emitting member 50 is not mounted).

Further, in the present embodiment, the light-emitting member 50 is not provided in order to Heat dissipation components (heat sinks, heat sinks, heat sinks, heat sinks, heat sinks, etc.) are generally provided for heat dissipation, but they can also be set as needed.

The vent hole 610 is provided, for example, at three positions facing the light-emitting member 50 between the support portions 602a and 602b. The vent 610 may be, for example, a circular hole having a hole diameter of 0.5 mm.

The vent hole 612 is provided, for example, at the lower portion of the light-emitting member 50, for example. The vent 612 may be, for example, a circular hole having a hole diameter of 0.5 mm.

The vent holes 614 are provided in the vicinity of both sides of the light-emitting member 50, for example, four on the left and right sides. The vent 614 improves the heat dissipation efficiency in order to efficiently discharge the heat energy in the vicinity of the light-emitting member 50, and may be a circular hole having a larger aperture than the other vent holes, for example, having a hole diameter of 0.8 mm.

The vent hole 616 is provided, for example, at a position farther from the light-emitting member 50 than the vent hole 614 (near the center between the two light-emitting members 50). In order to maintain the strength of the substrate 60, the vent 616 may also be a smaller aperture than the vent 614, such as a 0.5 mm aperture.

Here, the vent holes 612, 614, 616 may also be disposed on the substrate 60 at a position where the conductive paint 604 is applied, in which case, as shown in FIG. 9, the surfaces of the vent holes 612, 614, 616 may also be provided. The conductive paint 604 is applied to the inner wall of the hole.

Further, the substrate 60 is composed of a plurality of layers, and is formed of, for example, four layers in the order of the first layer 60A, the second layer 60B, the third layer 60C, and the fourth layer 60D.

Fig. 8(A) shows the first layer 60A, and Fig. 8(B) shows the second layer 60B. Fig. 8(C) shows the third layer 60C, and Fig. 8(D) shows the fourth layer 60D.

The light emitting member 50 is attached to the first layer 60A.

Further, vent holes 610, 612, 614, and 616 are formed in each of the first layer 60A, the second layer 60B, the third layer 60C, and the fourth layer 60D, and the conductive paint 604 is applied.

Further, in the first layer 60A, the second layer 60B, the third layer 60C, and the fourth layer 60D, the vent holes 612, 614, and 616 may be provided at positions where the conductive coating material 604 of the substrate 60 is applied.

Further, a conductor pattern 622 as an electric conductor is formed on each of the first layer 60A, the second layer 60B, the third layer 60C, and the fourth layer 60D, and each layer is electrically connected via a through hole 624 such as a through hole or a through hole. connection.

The vent holes 610, 612, 614, and 616 are formed on the first layer 60A, the second layer 60B, the third layer 60C, and the fourth layer 60D of the substrate 60, respectively, as indicated by an arrow D and an arrow E in FIG. The vent holes 610, 612, 614, and 616 discharge the heated air around the light-emitting member 50, thereby discharging the heat energy around the light-emitting member 50.

In particular, in the case where the vent hole 610 is not provided, the air between the light-emitting member 50 and the substrate 60 is surrounded by the light-emitting member 50, the support portion 602, and the substrate 60, so that it is difficult to discharge.

On the other hand, a vent hole 610 is provided at a position facing the light-emitting member 50, and as shown by an arrow D, air between the light-emitting member 50 and the substrate 50 can be easily discharged through the vent hole 610.

Further, a conductive coating material 604 is applied onto the surface (the inner wall of the hole) of the vent holes 612, 614, and 616, and the conductive coating material 604 applied to the vent holes 612, 614, and 616 is applied to the first layer 60A, respectively. The conductive coating material 604 on the second layer 60B, the third layer 60C, and the fourth layer 60D is in contact with each other, and the first layer 60A, the second layer 60B, the third layer 60C, and the fourth layer 60D are electrically connected to each other.

Further, in the above embodiment, the vent hole may be circular, but the vent hole may not be circular, but may have a long hole shape or may be formed in a louver shape.

Further, in the above embodiment, the image reading device is provided on the image forming apparatus, but may not be provided in the image forming apparatus, and may be provided, for example, in a scanner, a facsimile machine or the like.

10‧‧‧Image forming device

12‧‧‧Image Formation Department

14‧‧‧Image Forming Unit Ontology

16‧‧‧Sheet storage container

20‧‧‧Sheet transport path

22‧‧‧Image Holder

24‧‧‧Electrical appliances

26‧‧‧Exposure device

28‧‧‧Developing device

30‧‧‧Intermediate transfer belt

32‧‧‧Primary transfer device

34‧‧‧Photoreceptor cleaner

36a‧‧‧developer

36b‧‧‧developer

36c‧‧‧developer

36d‧‧‧developer

38‧‧‧Secondary transfer device

40‧‧‧Fixing device

42‧‧‧Exporting Department

44‧‧‧Intermediate transfer belt cleaner

46‧‧‧Barrier roller

50‧‧‧Lighting components

60‧‧‧Substrate

60A‧‧‧1st floor

60B‧‧‧2nd floor

60C‧‧‧3rd floor

60D‧‧‧4th floor

100‧‧‧Image reading device

104‧‧‧Reading station

106‧‧‧ platen components

108‧‧‧Guide members

110‧‧‧ platen cover

130‧‧‧Image reading unit

132‧‧‧Light guide

134a‧‧‧reflector

134b‧‧‧reflector

134c‧‧‧reflector

134d‧‧‧reflector

134e‧‧‧reflector

134f‧‧‧reflector

136‧‧‧ imaging lens

138‧‧‧ photoelectric conversion components

140‧‧‧Substrate support members

140a‧‧‧Bolts

142‧‧‧ photoelectric conversion element support member

144‧‧‧Sliding members

150‧‧‧Lighting device

160‧‧‧Original conveying device

302‧‧‧Operator panel

502‧‧‧ wafer frame

504‧‧‧ lead frame

510‧‧‧Lighting elements

602a‧‧‧Support

602b‧‧‧Support

604‧‧‧Electrical coating

610‧‧‧Ventinel

612‧‧‧Ventinel

614‧‧‧Ventinel

616‧‧‧Ventinel

622‧‧‧ conductor pattern

624‧‧‧through holes

A, D, E‧‧‧ arrows

D‧‧‧ original

Fig. 1 is a front elevational view showing the image forming apparatus of the embodiment.

Fig. 2 is a perspective view showing an image reading apparatus.

Fig. 3 is a perspective view showing an image reading unit.

4 is a cross-sectional view showing an image reading unit.

Fig. 5 is a view showing a light-emitting device.

Fig. 6 is a view showing a light emitting member.

Fig. 7 is a view showing a substrate.

8 is a view showing details of each layer of the substrate, wherein (A) shows a first layer, (B) shows a second layer, (C) shows a third layer, and (D) shows a fourth layer.

Fig. 9 is a cross-sectional view showing details of a vent hole.

50‧‧‧Lighting components

150‧‧‧Lighting device

604‧‧‧Electrical coating

612‧‧‧Ventinel

614‧‧‧Ventinel

616‧‧‧Ventinel

Claims (8)

A light-emitting device comprising: one or more light-emitting members; and a substrate having a support portion that supports the light-emitting members, and a plurality of vent holes are provided between the support portions. The light-emitting device according to claim 1, wherein one or more of the plurality of vent holes are provided at a position facing the light-emitting member. The light-emitting device according to claim 1, wherein the plurality of light-emitting members are provided in plurality, and the plurality of second vent holes in the plurality of vent holes are provided between the plurality of light-emitting members. The light-emitting device according to claim 3, wherein the substrate is composed of a plurality of layers, and an electric conductor is formed on a part of the surface of each of the layers, and the second vent hole is formed in each of the substrates. An electric conductor is formed on the surface of the second vent hole at the position of the electric conductor. The light-emitting device of claim 3, wherein, in the plurality of second vent holes, a size of the second vent hole close to the light-emitting member is larger than a size of the second vent hole that is farther from the light-emitting member . An image reading apparatus including: a housing; and an image reading unit that reads an image formed on a document, the image reading unit having one or more light emitting members that emit the original a substrate having a support portion for supporting the light-emitting member, a plurality of vent holes being provided between the support portions, and a light-receiving element that receives reflected light of the light emitted from the light-emitting portion on the original. The image reading device of claim 6, further comprising a guiding member supported on the frame for guiding the image reading device in the frame, the image reading When the image formed on the original is read, the portion moves along the guiding member. The image reading device of claim 7, wherein the substrate is vertically disposed on the image reading device with respect to the guiding member.