JP2002232650A - Document reading device - Google Patents

Abstract

(57) [PROBLEMS] To provide a document reading device having an inverter heat radiation structure capable of efficiently radiating heat generated by an inverter that turns on a high-intensity lamp used for illuminating a document. A heat conductor (13) formed in a rod shape having thermal conductivity, such as silicon rubber, is interposed between a heat radiating plate (4) of an inverter (2) and a reflecting plate (3) of a lamp (1). As a result, the heat conductor 13 having heat conductivity becomes
Can be transferred to the large-area reflecting plate 3 to dissipate heat, so that the heat dissipation efficiency can be improved. Reflector 3
Is generally made of brilliant aluminum or the like in terms of its function, and therefore has excellent thermal conductivity (heat dissipation), and can quickly radiate the heat transmitted to the reflector.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document reading apparatus, and more particularly, to a document reading apparatus such as a copying machine, a facsimile, and an image scanner.

[0002]

2. Description of the Related Art FIG. 4 is a side view for explaining the structure of a conventional document reading apparatus, and FIG. 5 is a perspective view showing the structure of a first traveling body on which a lamp and an inverter are mounted. With reference to FIG. 5, a conventional document reading apparatus will be described. 4 and 5, 1 is an illumination lamp, 2 is an inverter, 3 is a reflector, 4 is a heat sink, 5 is a document surface, 6 is a CCD (light receiving surface), 8 is a first traveling body, and 9 is a second traveling body. The traveling bodies 10 to 12 are first to third mirrors.

As shown in FIG. 4, a document reading apparatus according to the prior art has a lamp 1 for illuminating a document placed on a document surface 5 formed of glass or the like on the upper surface of a housing. First traveling body 8 for lighting while traveling
And a second traveling body 9 that travels at half the speed of the first traveling body 8 that forms an optical path for receiving the image of the document on the light receiving surface of the CCD 7 via the lens 6.

In the document reading apparatus thus configured, the reflected light from the illuminated portion of the document is transmitted to the first traveling body 8.
The light is guided to the lens 6 via the first mirror 10 provided on the lens and the second and third mirrors 11 and 12 provided on the second traveling body 9 and condensed on the light receiving surface of the CCD 7 to constitute a line sensor. It is read by the CCD 7. The second traveling body 9 is made to travel at half the speed of the first traveling body 8 so that the optical path length from the illuminated document surface to the CCD 7 does not fluctuate.

The first traveling body 8 includes a lamp 1 for illuminating the original.
And a reflector 3 for guiding light from the lamp 1 to the original surface.
And a first for guiding reflected light from the document surface to a predetermined optical path.
A mirror 10 and an inverter 2 for lighting the lamp 1 are provided. Further, the inverter 2 is provided with a radiator plate 4 for radiating heat generated by the operation of the inverter 2.

In the above-described document reading apparatus according to the prior art, it is essential to illuminate the document. However, with the recent increase in speed and color, a higher light intensity lamp and a corresponding inverter are mounted. As a result, the heat generated by the inverter is increased, and in the case of a poorly ventilated reading device, there is a problem that the heat may not catch up with the case and the allowable operating temperature of the inverter may be exceeded.

[0007] As a conventional technique capable of solving such a problem, for example, a technique described in Japanese Patent Application Laid-Open No. Hei 10-242673 is known. In this prior art, heat generated from a heat generating member of the inverter is radiated by a case of the inverter.

[0008]

As described above, a lamp and an inverter having a higher light intensity have been used for illuminating a document in a reading apparatus due to an increase in speed and color. As a result, the heat generated by the inverter is also increasing.

In the above-described document reading apparatus according to the prior art, sufficient consideration is not given to the heat radiation of the inverter which generates a large amount of heat. Has the problem that it may be exceeded.
Further, the prior art described in the official gazette uses the case of the inverter for heat dissipation, but has a problem that it is not possible to increase the size of the case and it is difficult to improve the heat dissipation efficiency. ing.

According to the present invention, it is an object of the present invention to provide a document reading apparatus having an inverter heat radiating structure capable of efficiently radiating heat generated by an inverter for lighting a high-intensity lamp used for illuminating a document. is there.

[0011]

According to the present invention, there is provided a document reading apparatus including an illumination lamp, an inverter for lighting the illumination lamp, and a reflector of the lamp. This is achieved by providing a heat conductor between the heat sink and the heat sink provided in the inverter.

Further, the above object is achieved by bringing the reflector of the lamp into direct contact with a heat sink provided on the inverter, and by fastening the contact portion with a fastening member.

Further, the above object is achieved by integrating the reflector of the lamp and the heat radiator provided in the inverter.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a document reading apparatus according to the present invention will be described below in detail with reference to the drawings. The document reading apparatus to which the present invention is applied may be the same as the related art described with reference to FIGS.

FIG. 1 is a diagram showing a configuration of a first traveling body of a document reading apparatus according to a first embodiment of the present invention. Figure 1
In the figure, reference numeral 13 denotes a heat conductor, and the other reference numerals are the same as those in FIGS.

FIG. 1A is a cross-sectional view showing the structure of the first traveling body 8 of the document reading apparatus according to the first embodiment of the present invention, and FIG. FIG. 3 is a perspective view showing details of a reflection plate 3. Figure 1
As can be seen from FIG. 1A and FIG. 1B, in the first embodiment of the present invention, the gap between the heat radiating plate 4 of the inverter 2 and the reflecting plate 3 of the lamp 1 is, for example, made of silicon rubber or the like. It is constituted by sandwiching a heat conductor 13 formed in a rod shape having heat conductivity.

In the first embodiment of the present invention, the heat conductor 13 having heat conductivity is used to transfer the heat of the heat radiating plate 4 to the large area reflecting plate 3.
Since the heat can be transmitted to the heat sink, heat radiation efficiency can be improved. The reflecting plate 3 usually has a function
Since it is made of brilliant aluminum or the like, it has excellent thermal conductivity (heat dissipation), and can quickly radiate the heat transmitted to the reflector.

The above-mentioned heat conductor 13 is not limited to silicon rubber and the like, but may be, for example, aluminum, copper or the like formed in a rod shape. In this case, the contact portion with the reflection plate 3 and the heat radiation plate 4 It is good to make thin silicon rubber etc. intervene in the contact part of.

The heat conductor 13 in the above-described example can be held only by sandwiching the heat conductor 13 between the heat radiating plate 4 and the heat radiating plate 4 by the elastic force of the reflecting plate 3.

FIG. 2 is a view showing the structure of a first traveling body of a document reading apparatus according to a second embodiment of the present invention. FIG.
In the figure, 14 is a radiator plate, 15 is a fastening member, and other reference numerals are the same as those in FIGS.

FIG. 2A is a sectional view showing the structure of the first traveling body 8 of the document reading apparatus according to the second embodiment of the present invention. As can be seen from this figure, in the second embodiment of the present invention, the height direction of the heat sink attached to the inverter 2 is extended to the position of the reflector 3 as shown as a heat sink 14, 3 and the heat radiating plate 4 are brought into contact in the longitudinal direction. In this case, the contact between the reflector 3 and the heat sink 4 can be maintained by the elastic force of the reflector 3.

FIG. 2B is a cross-sectional view showing the structure of the first traveling body 8 of the document reading apparatus according to a modification of the second embodiment of the present invention, and FIG. The perspective view which shows the detail of the part of the board 14 is shown. FIG.
In the example shown in FIG. 2B and FIG. 2C, the upper part of the heat sink 14 shown in FIG. 2A is bent into an L-shape, and the bent part and the reflector 3 are fastened by a fastening member 15 such as a screw. It is a combination.

According to the second embodiment of the present invention described with reference to FIG. 2, since the heat of the heat radiating plate 4 can be directly transmitted to the large-area reflecting plate 3 to release the heat, the heat radiation efficiency is further improved. be able to.

FIG. 3 is a view showing the structure of a first traveling body of a document reading apparatus according to a third embodiment of the present invention. FIG.
In the figure, reference numeral 16 denotes a reflection plate and a heat radiation plate, and the other reference numerals are the same as those in FIGS.

FIG. 3A is a sectional view showing the structure of the first traveling body 8 of the document reading apparatus according to the second embodiment of the present invention, and FIG. FIG. 3 is a perspective view showing details of a portion of a plate 16. In the third embodiment of the present invention, a reflector is extended and integrated with a radiator to form a reflector / radiator 16, and the inverter 2
The heat is dissipated.

According to the third embodiment of the present invention described with reference to FIG. 3, since the heat from the inverter 2 can be directly transmitted to the large-area reflector / radiator plate 16, heat can be radiated.
The heat radiation efficiency can be further improved as compared with the first and second embodiments.

[0027]

According to the present invention, the heat dissipation efficiency of the inverter can be improved only by adding a heat conductor without requiring a special shape for the reflector and the inverter. For this reason, there is an advantage that an off-the-shelf product (standard shape) of a manufacturer can be used as the inverter.

According to the second and third aspects of the present invention, the reflecting plate and the radiating plate of the inverter are brought into direct contact with each other, or
Since the fastener is fastened, mounting accuracy or rigidity of the reflector is required so that the reflector is not distorted. However, heat can be more efficiently dissipated than the first aspect of the invention.

According to the fourth aspect of the present invention, since the reflecting plate and the heat radiating plate have an integral structure, loss of heat transfer efficiency at the contact portion in the case of the first to third aspects of the present invention occurs. There is no advantage.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of a first traveling body of a document reading device according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration of a first traveling body of a document reading device according to a second embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a first traveling body of a document reading device according to a third embodiment of the present invention.

FIG. 4 is a side view illustrating the structure of a document reading apparatus according to the related art.

FIG. 5 is a perspective view showing a structure of a first traveling body on which a lamp and an inverter are mounted.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Illumination lamp 2 Inverter 3 Reflector 4, 14 Heat sink 5 Original surface 6 CCD (light receiving surface) 8 1st running body 9 2nd running body 10-12 1st-3rd mirror 13 Heat conductor 15 Fastening member 16 Reflection Plate and heat sink

Claims (4)

[Claims] 1. A document reading apparatus comprising an illumination lamp, an inverter for lighting the illumination lamp, and a reflector of the lamp, wherein heat conduction is performed between the reflector of the lamp and a heat sink provided in the inverter. A document reading device comprising a body. 2. A document reading apparatus comprising an illumination lamp, an inverter for lighting the illumination lamp, and a reflector of the lamp, wherein the reflector of the lamp and a heat radiator provided in the inverter are brought into direct contact. An original reading apparatus, comprising: 3. The document reading apparatus according to claim 2, wherein a portion that directly contacts the reflector of the lamp and a heat radiator provided in an inverter is fastened by a fastening member. 4. A document reading apparatus comprising an illumination lamp, an inverter for lighting the illumination lamp, and a reflector of the lamp, wherein the reflector of the lamp and a radiator provided in the inverter are integrated. An original reading apparatus, comprising: