JP2001312014A - Original scanner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an original reader which can be large-sized and has reduced cost by simple constitution and which can conduct excellent reading of an original by efficiently radiating heat from a drive device such as an inverter for driving a lamp. SOLUTION: The original reader is provided with a drive section having a xenon lamp 100 for irradiating the original, a reflecting plate 102 for reflecting light from the xenon lamp 100 and the inverter 206 for driving the xenon lamp 100 and irradiates the original with light from the xenon lamp 100 by relatively moving the xenon lamp 100, the reflecting plate 102 and the original. In this original reader, a heat conducting path is formed between the reflecting plate 102 and the inverter 206.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an original reading apparatus provided for a scanner, a copying machine, and the like, and more particularly, to an original reading apparatus mounted on an original table by an irradiation light source such as a xenon lamp or a halogen lamp provided in a scanning unit. The present invention relates to a document reading apparatus that scans a document by moving the scanning unit relatively to the document while irradiating the document.

[0002]

2. Description of the Related Art Generally, a document reading device provided in a scanner device, a copying machine, etc. irradiates a document with light and scans the document, and converts the reflected light into a document image into electronic data by photoelectric conversion means such as a CCD. There are two types of document reading systems: one that fixes the light source to the document reading device and scans while moving the document with respect to the light source, and the other that uses the light source while the document is stationary in the document reading device. There is a type that scans by running. As a light source for irradiating the original with light, a halogen lamp, a xenon lamp, or a fluorescent lamp is used.

[0003] Comparing the performances of these light sources, the halogen lamp has a larger light emission amount than the xenon lamp or the fluorescent lamp in terms of the total light amount. On the other hand, halogen lamps generate more heat than xenon lamps and fluorescent lamps. Therefore, it can be said that a xenon lamp or a fluorescent lamp is more suitable than a halogen lamp in a document reading apparatus in which electronic components relatively weak in temperature rise are arranged inside.

Here, in the case of a document reading apparatus in which the light source is fixed, the temperature around the light source in the document reading apparatus tends to rise locally. Therefore, a light source having a small heat value such as a xenon lamp or a fluorescent lamp is particularly preferable.

On the other hand, in the case of a document reading apparatus in which the light source travels, a driving circuit such as an inverter for driving the light source is required. The inverter or the like is fixed to the document reading apparatus and travels with the inverter. In general, a light source and a light source are connected by a harness. The harness is required to have a high withstand voltage capable of transmitting a high voltage applied to the light source, and to withstand a deformation (bending) that is repeated with the movement of the light source.

[0006] However, a harness that satisfies such demands is inevitably expensive, causing an increase in the cost of the image reading apparatus. In the configuration in which the harness is repeatedly deformed during operation as described above,
There have been problems such as the risk of breakage of the harness and the occurrence of blurring during the movement of the carriage for moving the light source due to the rigidity of the harness itself.

Therefore, as disclosed in JP-A-6-308627, the light source and the inverter are mounted on the same carriage, so that the light source and the inverter are integrally connected and linked to each other so that the relative position is obtained. A method for avoiding the displacement has been proposed. According to this method, a xenon lamp or a fluorescent lamp, which is a light source, generates less heat than a halogen lamp as described above, but heat is generated from a drive circuit such as an inverter that drives the xenon lamp or the fluorescent lamp. A problem arises in that the temperature near the carriage increases.

The problem of heat generation is that even when the amount of heat generated from the inverter or the like is taken into consideration, the amount of heat generated when using a xenon lamp or a fluorescent lamp is smaller than when using a halogen lamp. The advantage of reducing the calorific value by using the lamp is maintained.

[0009]

However, as the size of the document reading apparatus has been reduced, the necessity of heat dissipation from an inverter or the like in a narrow space has been further increased when a xenon lamp or a fluorescent lamp is used. In the conventional method including the above-described example, since heat radiation of the inverter and the like is not considered, there is a problem that damage to electronic components and lack of stability of operation are caused as the temperature in the device increases due to heat generated by the inverter and the like. It is self-evident.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and uses existing components as much as possible to avoid complication of the device configuration and increase in the number of components. While increasing the size and cost of
By efficiently radiating heat from a driving device such as an inverter for driving a low heat-generating lamp such as a xenon lamp or a fluorescent lamp, it is possible to suppress a local rise in temperature in the apparatus and to reduce the temperature of the driving device. An object of the present invention is to provide a document reading apparatus capable of stably driving electronic components and stabilizing the light amount of a lamp, thereby performing good reading of a document.

[0011]

According to the present invention, there is provided an irradiation light source for irradiating an original, a reflecting member for reflecting light from the irradiation light source, and a driving unit having a heating device for driving the irradiation light source. In a document reading apparatus that relatively moves the document with the irradiation light source and the reflection member and irradiates the document with light from the irradiation light source, a heat conduction path is formed between the reflection member and the heating device. It is characterized by the following.

It is preferable that a scanning unit for integrally holding the irradiation light source, the reflecting member, and the driving unit be provided, and that the scanning unit be scanned to read an original. Further, it is preferable that the reflection member includes a holding portion for holding the reflection member on the scanning unit, between a portion where a heat conduction path between the heating device and the heat generation device is formed and the reflection portion. . Further, it is preferable that the heat-generating device is arranged adjacent to the back side of the reflection surface. In addition, the reflection member, at least a portion from the portion where the heat conduction path between the heating device is formed and the reflection portion,
It is preferable to provide a weakened portion having a bending strength smaller than other portions. The scanning unit includes a base portion that holds the reflection member, the driving portion includes a driving circuit board on which a driving circuit is formed, and the base portion includes an opening, and the base includes an opening. It is preferable that the heat generating device is disposed on the front and back sides of the base portion through the opening, and the drive circuit board is held on the back side on which the reflection member is held. In addition, the reflection surface of the reflection member is installed to be inclined with respect to the traveling direction of the scanning unit, and the driving circuit board includes:
It is preferable that the heat generating device is installed on the reflection member side of the drive circuit board, being inclined and installed on the back side of the reflection surface of the reflection member.

According to the present invention, by forming a heat conduction path between the reflecting member and the heating device, the reflecting member can be used as a heat sink of the heating device. That is, the heat of the heating device in the drive unit of the irradiation light source is
Heat can be dissipated via the existing reflection member, and local temperature rise in the apparatus can be suppressed, and stable document reading can be realized. In addition, since there is no need to newly provide a heat-dissipating member, it is possible to suppress an increase in cost, and the apparatus and its assembling process are not complicated.

A scanning unit that integrally holds the irradiation light source, the reflecting member, and the driving unit, and scans the scanning unit to read an original, thereby moving the scanning unit integrally by moving means. Thus, the original and the scanning unit can be relatively moved. Therefore,
Since no load is applied to the harness connecting the drive circuit provided in the drive section and the irradiation light source due to an external force, there is a danger that the harness is disconnected, and the rigidity of the harness itself causes the carriage for moving the light source to move during movement. Can be prevented from occurring. Further, the reflection member functioning as a heat radiating plate of the heat generating device moves inside the device, thereby promoting the convection of the air inside the device, dispersing the heat inside the device, and dissipating heat. Can be improved.

Further, the reflection member has a holding portion for holding the reflection member to the scanning unit between a portion where a heat conduction path is formed between the heating device and the reflection portion. In addition, the holding portion serves as a kind of buffer, so that the vibration of the reflecting portion due to the vibration of the inverter as the heating device can be suppressed. Therefore, it is possible to stabilize the amount of irradiation light on the document surface.

Further, by disposing the heating device adjacent to the back side of the reflection surface, it is possible to arrange the heating device by utilizing a space on the reflection member on the back side of the reflection surface. Since the heat conduction path with the reflection member can be formed, the size of the scanning unit can be avoided, and the space of the document reading device can be reduced.

Further, the reflection member includes a weakened portion having a bending strength smaller than that of the other portion in a portion extending from a portion where a heat conduction path between the heating device and the heat generating device is formed to the reflecting portion. The heat-generating device can be fixed to the reflective member without having to increase the mounting accuracy of the board with the heat-generating device to the scanning lamp unit, because the deformation of the part forming the heat transfer path of the reflective material can be tolerated. And the displacement of the reflection surface can be prevented.

The scanning unit further includes a base having an opening formed therein, and a heat generating device is disposed in the base so as to penetrate the opening and cover the front and back of the base to hold a reflection member. By holding the drive circuit board on the back side of the drive circuit board, a heating device is provided on the side of the drive circuit board on which the reflection member is held, and the heating device is projected from the opening to the reflection member side so that the device and the reflection member A heat transfer path is formed, or a heat generating device is provided on the side of the drive circuit board where the reflection member is held, and a part of the reflection member is extended from the opening to form a heat transfer path with the heat generation device. By forming, the heat transfer path can be configured without going around the base portion.
Even if it is arranged on the back side opposite to the side where the reflecting surface of the irradiation light source or the reflecting member is located with respect to the base portion of the scanning unit, it is possible to configure without increasing the shape of the reflecting member and to radiate heat from the heating device.

Further, the driving circuit board is installed on the back side of the reflecting surface of the reflecting member, and the heating device is installed at the end of the driving circuit board on the reflecting member side. The scanning lamp unit can be downsized in the sub-scanning direction as compared with the case where the drive circuit board is installed substantially parallel to the (sub-scanning direction). Further, as compared with the case where a heat generating device is provided at the side end on the drive circuit board side, the configuration can be made without increasing the size of the reflecting member.

[0020]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an overall view showing a configuration of a digital copying machine provided with a document reading apparatus according to an embodiment of the present invention.

The document reading apparatus according to the present embodiment is provided in a digital copying machine 30 as an image forming apparatus, as shown in FIG. The main body of the digital copying machine 30 is roughly composed of a scanner unit 31 as a document reading device and a laser printer unit 32. The scanner unit 31 includes a contact glass 35 as a document table made of transparent glass on an upper portion of the main body of the scanner unit 31.
A double-sided automatic document feeder (hereinafter, referred to as “RADF: Re
versing Automatic Documen
t Feeder ") 36 is disposed above and in contact with the contact glass 35, and the contact glass 3
A scanner unit 40 serving as a document image reading unit for scanning and reading an image of a document placed on
Is disposed inside the main body below the contact glass 35. In this embodiment, the document reading apparatus is provided with the RADF 36. However, the RADF 36 is not always required in the present invention.

The scanner section 31 reads an image of a document on the contact glass 35. The document image read by the scanner section 31 is sent as image data to a CCD element 44 described later. Predetermined image processing is performed on the image data by the CCD element 44.

The RADF 36 is a device for setting a plurality of documents on a document tray (not shown) and automatically feeding the set documents one by one onto the contact glass 35 of the scanner unit 40. Further, the RA
The DF 36 includes a transport path for a one-sided document (not shown), a transport path for a two-sided document (not shown), and a transport path so that the scanner unit 40 reads one or both sides of the document according to an operator's selection. A switching unit (not shown), a sensor group (not shown) for grasping and managing the state of a document passing through each unit, a control unit, and the like are provided.
As for the RADF 36, many techniques have been disclosed in the past, and many have been commercialized, so that detailed description will be omitted.

The scanner unit 40 includes a lamp reflector assembly 41 which is disposed below the main body and irradiates the surface of the original from below, and a photoelectric conversion element (hereinafter, referred to as "CCD") for reflecting a reflected light image from the original. : Char
(referred to as “ge Coupled Device”) 44, a first scanning unit (scanning unit) 40 a having a first reflecting mirror 42 a for reflecting the reflected light from the original is mounted below the contact glass 35. And a second reflection mirror 42b and a third reflection mirror for guiding a reflected light image from the first reflection mirror 42a to a CCD element 44 as a photosensitive light receiving means, downstream of the first scanning unit 40a. The second equipped with 42c
A scanning unit 40b, an optical lens 43 for forming a reflected light image from the original on the CCD element 44 via the above-described reflecting mirrors 42a, 42b, 42c, and an electric image of the reflected light image from the original CCD element 4 for converting to signal
4 are arranged.

The scanner unit 31 includes the RADF 36
And the operation related to the scanner unit 40,
The scanner unit 40 is configured to scan and move the scanner unit 40 along the lower surface of the contact glass 35 while reading originals to be read are sequentially placed on the contact glass 35 to read an image of the original.

In particular, the first scanning unit 40a travels along the contact glass 35 from left to right in FIG. 1, that is, in the sub-scanning direction A at a constant speed V (not shown). Further, the second scanning unit 40b includes the first scanning unit 40b.
Scanning is controlled in parallel to the same direction A at a speed of V / 2 (not shown) with respect to the speed V of the scanning unit 40a. In this manner, the image of the document placed on the contact glass 35 can be sequentially formed on the CCD element 44 line by line to read the image.

The image data of the document read by the scanner unit 40 is sent to an image processing unit (not shown), and after being subjected to various processes, is temporarily stored in a memory of the image processing unit. Then, the image data in the memory is read out in accordance with the output instruction, transferred to the laser printer unit 32, and the laser printer unit 32 forms an image on recording paper.

The laser printer section 32 has, below the main body thereof, a recording paper transport system for forming an image including cassette paper feeders 51 and 52, which will be described later, and a laser printer above the transport system. A writing unit 46 and an electrophotographic processing unit 47 for forming an image are arranged.
The laser writing unit 46 incorporates a semiconductor laser light source (not shown), a polygon mirror, an fθ lens, and the like. The semiconductor laser light source emits a laser beam according to image data read from the memory after reading by the scanner unit 40 or image data transferred from an external device. This laser light is deflected at a constant angular velocity by a polygon mirror, and further deflected by an fθ lens.
The correction is performed so that the photosensitive drum 48 constituting the electrophotographic process unit 47 moves at a constant speed on the photosensitive drum 48.

The electrophotographic process section 47 is of a known type, and has a charger,
It has a developing device, a transfer device, a peeling device, a cleaning device, a static eliminator and the like.

On the other hand, the recording paper transport system includes a transport section 32a for transporting the recording paper to a transfer position where a transfer unit of the electrophotographic processing section 47 for forming an image is arranged, and a transport section 32a for the transport section. Cassette paper feeding devices 51 and 52 for feeding recording paper or a manual paper feeding device 54 for appropriately feeding recording paper of a required size; and an image formed on the recording paper after transfer, that is, a toner image. A fixing device 49 for fixing is provided, and a re-supply path 53 for re-supplying the recording sheet to form an image again on the back surface of the fixed recording sheet.

Downstream of the fixing device 49, a post-processing device 34 that receives a recording sheet on which an image is recorded and performs a predetermined process on the recording sheet is provided by the laser printer unit 3.
2 are arranged adjacent to the outside.

According to the laser printer unit 32 having the above configuration, the image data read from the image memory is formed as an electrostatic latent image on the surface of the photosensitive drum 48 by emitting a laser beam by the laser writing unit 46. Is done. Thereafter, the toner image visualized by the toner is electrostatically transferred and fixed onto the surface of the sheet conveyed from one of the cassette sheet feeding devices 51 and 52 or the manual sheet feeding device 54 in the multi-stage sheet feeding unit. You. The sheet on which the image is formed in this manner is transported from the fixing device 49 into the post-processing device 34.

Next, the scanner unit 40 of the present embodiment will be described.
The first scanning unit 40a as a scanning unit in the above will be described in detail with reference to the drawings. FIG. 2 is a plan view showing a configuration of a scanning unit of the document reading apparatus according to the embodiment, FIG. 3 is a side view showing a configuration of the scanning unit,
FIG. 4 is a perspective view showing a configuration of an irradiation light source according to the present embodiment,
FIG. 5 is a perspective view showing a configuration of the irradiation light source support, and FIG. 6 is an explanatory view showing scanning by the document reading device.

As shown in FIGS. 2 and 3, the first scanning unit 40a has a xenon lamp (low heat generation lamp, irradiation light source) 100 disposed substantially at right angles to the scanning direction, and is opposed to the xenon lamp 100 substantially in parallel. In addition, a reflector (reflector) 102 having a length substantially the same as that of the xenon lamp 100 is provided. As shown in FIG. 4, the xenon lamp 100 includes lamp holders 121 and 122 formed on a lamp reflector assembly support 41a as a base.
As shown in FIG. 5, a portion to which the phosphor is applied and an aperture 101 to which the phosphor is not applied are formed on the inner wall surface of the lamp tube. In order to reflect a part of the light from the xenon lamp 100 toward the contact glass 35, the reflecting plate 102 moves the lamp reflector assembly support 41a relative to the xenon lamp 100 (in the direction of arrow A in FIG. 5). ). Further, the reflection plate 102 is provided with a reflection surface 102a inclined so as to face the contact glass 35 with respect to a normal to a surface perpendicular to the traveling direction. At substantially the center of the lamp reflector assembly support 41a, a reflector support 41b is formed substantially vertically. An inverter (heat generating device) 206 described later is disposed on the reflection plate support portion 41b with the reflection plate 102 interposed therebetween.

Here, the xenon lamp 100 and the aperture 101 are coated with the portion coated with the phosphor as described above.
By using the xenon, even when the xenon lamp 100 having a relatively small amount of light is used, light can be used effectively by narrowing the light emission range.

The light emitted from the xenon lamp 100 irradiates the original G placed on the contact glass 35 as shown in FIG. Here, Xenon lamp 1
Part of the light from 00 (indicated by rough hatching in FIG. 3) is directly incident on the contact glass 35 to irradiate the original G. Another part of the light from the xenon lamp 100 (shown by dense hatching in FIG. 3) is reflected once by the reflector 102 provided on the lamp reflector assembly support 41a, and then enters the contact glass 35. To irradiate the original G.

As shown in FIG. 1, the light illuminated and reflected on the original G passes between the xenon lamp 100 and the reflector 102, and passes through the slit 103 formed on the bottom surface of the lamp reflector assembly support 41a. After passing through, each reflection mirror 42a, 42b, 42c and optical lens 43
As a result, an image is formed on the light receiving surface of the CCD element 44.

Here, as described above, the light emitted from the aperture 101 is directly applied to the area on the document G corresponding to the width of the slit 103 (hereinafter, referred to as “reading area B”). The direct irradiating light 104 (indicated by rough hatching in FIG. 3) and the indirect irradiating light irradiating the reading area B indirectly via the reflecting surface 102a of the reflecting plate 102 provided on the lamp reflector assembly support 41a 105 (shown by dense hatching in FIG. 3)
There is.

In the sub-scanning direction (the direction of arrow A in FIG. 3) of the reading area B in the case where the document does not float, the ratio of the minimum light amount to the peak scene value of the irradiated light is 9
It is set to be 0% or more. That is, as shown in FIG. 3, in the sub-scanning direction (direction of arrow A) of the reading area B in a state where the original G is not lifted, that is, in a state where the original G is brought into close contact with the contact glass 35, The ratio of the minimum light amount value generated at the end portions Be and Be of the reading area B to the peak light amount value generated at the central portion Bc is set to be 90% or more when the peak light amount value is 100%.

In this setting, a xenon lamp 100 having a predetermined light emission amount is used as the xenon lamp 100, the opening 101a of the aperture 101 of the xenon lamp 100 is set to a predetermined value, and the width of the slit 103 is reduced. In the scanning direction, for example, 6 mm,
This can be realized by balancing the light amounts of the direct irradiation light 104 and the indirect irradiation light 105.

However, the illuminance distribution in the actual reading area B is affected by variations in processing accuracy, assembly accuracy, and the like with respect to the set values of these elements, and a peak light amount value is necessarily obtained at the central portion Bc of the reading area B. Not always. The position where the original document G is actually read in the reading area B is determined to be at the center Bc, or the reading position is shifted from the center Bc of the reading area B in the sub-scanning direction due to some influence. Even in the case of deviation, by setting the central portion Bc to the peak light amount value, adverse effects due to a decrease in light amount at the reading position can be reduced. Therefore,
It is desirable that the light amount at the central portion Bc always achieves the peak light amount value.

The reflection plate 102 is provided to increase the amount of light at the center of the reading area B. Further, the edge of the original is read only by the direct light from the xenon lamp 100, so that the edge is prevented.

Next, the configuration of a drive circuit and an inverter for driving the xenon lamp 100 will be described in detail. In the present embodiment, as shown in FIG. 2, the first scanning unit 40a is fixed to the wires 202 by wire fixing plates 200 arranged at both ends in the width direction of the first scanning unit 40a. As shown in FIG. 6, the wire 202 is installed on the scanner unit 31 and is stretched by a pulley (not shown) connected to a motor (not shown). The first wire 202 is driven by driving the motor.
The scanning unit 40a is moved in the sub-scanning direction (the direction of arrow A in FIG. 6).
Is to be scanned.

The inverter (heating device) 206 connected to the xenon lamp 100 and the driving circuit connected to the inverter 206 are installed on the lamp reflector assembly support 41a of the first scanning unit 40a.

The inverter 206 penetrates an opening 102c formed substantially at the center of the lamp reflector assembly support 41a, and extends the reflector 102 from the reflector 102a. 1
The inverter 206 is fixed to the reflection plate support portion 41b by an inverter fixing screw 208 with one side of the inverter 206 being in close contact with a portion other than 02a. That is, the reflection plate 10
2 is used as a heat sink.

As described above, since the inverter 206 generates heat when driving the xenon lamp 100, when the heat generated in the inverter 206 is not radiated, the drive circuit provided on the drive circuit board 204 is particularly required. The temperature of the electronic components and the like forming the semiconductor device rises, and a problem such as malfunction or breakage of the drive circuit may occur. Therefore, in order to solve the above problem, it is preferable to efficiently radiate the heat generated in the inverter 206.

The reflection plate 102 has a relatively large area and is conventionally formed of a material having high heat conductivity such as aluminum or an aluminum alloy. Therefore,
The reflector 102 has favorable conditions as a heat sink. That is, with the above-described configuration, the inverter 2 can be configured by using existing components in the conventional device (the first scanning unit 40a).
06 can be efficiently dissipated.

In order to efficiently radiate the heat generated in the inverter 206 by the reflection plate 102, it is necessary to efficiently transmit the heat to the reflection plate. For that purpose, it is preferable to increase the contact area between the inverter 206 and the reflection plate 102. So, for example,
When the inverter 206 has a substantially rectangular parallelepiped shape,
The side surface having a larger area in the rectangular parallelepiped is
Preferably, the contact surface with the second surface is formed. Further, it is preferable that the contact surfaces of the inverter 206 and the reflection plate 102 have a large planar portion and a small surface roughness.

As described above, according to the present embodiment, in this embodiment, the reflector 102 is used as a heat sink of the inverter 206, and the reflector 102, the inverter 206 and the drive circuit board 204 are arranged as shown in FIG. Since the lamp reflector assembly support member 41a is disposed on the front and back sides of the lamp reflector assembly 41a, the size of the apparatus can be suppressed.

In this embodiment, the reflector 102 is supported by a reflector support 41b extending in the lamp reflector assembly support 41a in the direction perpendicular to the traveling direction (the direction of arrow A in FIG. 6). I have. Then, it is bent between the reflection plate support portion 41b and the contact glass 35, and the back surface (reflection surface 1) of the reflection plate support portion 41b.
It extends downward (in the direction opposite to the contact glass 35) along the surface on which the xenon lamp 100 and the xenon lamp 100 do not exist, and is fixed by a reflector fixing screw (reflector fixing screw) 210.

The inverter 206 is disposed in contact with the reflection plate 102 on the back surface of the reflection plate support portion 41b.
02 is fixed to the reflection plate support portion 41b.

Therefore, the reflection plate 102 is fixed to the reflection plate supporting portion 41b by the reflection plate fixing screw 210 and the inverter fixing screw 208, so that the inverter 206 is fixed.
Is transmitted to the reflection plate 102. That is, the light from the xenon lamp 100 can be stably radiated on the document G.

In this embodiment, the inverter 206 extends on the back surface (the direction opposite to the contact glass 35) of the lamp reflector assembly support 41a via the opening 41c provided in the lamp reflector assembly support 41a. The reflector 10 is connected to the drive circuit board 204 disposed on the back surface (the direction opposite to the contact glass 35) of the lamp reflector assembly support 41a.
The other end (the end opposite to the side where the inverter 206 is installed) of the second lamp reflector assembly support member 41a
Is inserted into the insertion portion 41d.

Thus, it is possible to prevent the reflection plate 102 from being blurred or the like and to prevent the reflection surface 102a from being deformed due to expansion and contraction due to thermal expansion of the reflection plate 102.
Further, the reflection plate 102 has a weakened portion 102b which is a portion having a weak bending strength between the reflection surface 102a and the inverter fixing screw 208 and the reflection plate fixing screw 210, so that the thermal expansion of the reflection plate 102 is achieved. Expansion and contraction can be absorbed.

Next, a modification of the first scanning unit 40a will be described with reference to the drawings. FIG. 7 is a side view showing a configuration of a modification of the present embodiment. In the first scanning unit 40a shown in FIG. 7, the portion on the side of the xenon lamp 100 from the insertion portion 41d has the same configuration as the first scanning unit 40a shown in FIGS.

In a modified example, as shown in FIG. 7, in the first scanning unit 40a, on the back surface of the reflector supporting portion 41b, the reflector 102 is bent at an acute angle and formed to be inclined. The inverter 206 and the drive circuit board 204 are arranged in a state almost parallel to the reflection plate 102. According to such a configuration, the first scanning unit 40a is moved in its traveling direction (the direction of arrow A in FIG. 7).
Can be further reduced in size. Further, the size of the document blunting device in the sub-scanning direction can be reduced, which can contribute to downsizing of the device.

In the above-described embodiment and the modified example, the first scanning unit 40a equipped with a light source and the like is relatively moved with respect to the original placed on the original placing table.
Although the present invention is applied to a document reading apparatus that scans a document, the present invention is not limited to this, and a document that reads a document by scanning a running document using a fixed light source or the like. The present invention may be applied to a reading device.

In the above-described embodiments and modifications, the cooling of the reflecting member is performed by moving the first scanning unit or replacing the air in the apparatus by a cooling fan or the like. If the member is cooled, the heating device can be cooled effectively. In such a case, radiating the heat of the heating device using the reflecting member has an advantage that the reflecting member does not cover the space because the reflecting member reflects the light to the document, so that cooling is easy. There is also.

The shape of the reflecting plate 102 is the same as that of the reflecting surface 10.
It is preferable to increase the surface area by providing a concavo-convex shape in a portion other than 2a. Thereby, heat dissipation can be further improved. Further, according to the configuration of the present embodiment, the heat radiation is improved, but the scanner unit 3
Providing a fan in 1 can further improve heat dissipation.

[0060]

As described above, according to the original reading apparatus according to the first to seventh aspects of the present invention, by using existing parts as much as possible, it is possible to eliminate the necessity of providing additional heat radiation parts. With a simple configuration, avoiding the complexity of the device configuration and the increase in the number of parts, aiming to increase the size of the device and reduce costs,
In addition to simplifying the assembly, heat from a driving device such as an inverter for driving a low heat generation lamp such as a xenon lamp or a fluorescent lamp can be efficiently radiated.
Accordingly, it is possible to realize good document reading by suppressing a local rise in temperature in the document reading device and stably driving electronic components such as a driving device to stabilize the light amount of the lamp.

[Brief description of the drawings]

FIG. 1 is an overall view showing a configuration of a digital copying machine provided with a document reading apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view illustrating a configuration of a document reading apparatus according to the embodiment.

FIG. 3 is a perspective view illustrating a configuration of an irradiation light source according to the embodiment.

FIG. 4 is a perspective view showing a configuration of the irradiation light source support.

FIG. 5 is a side view showing the configuration of the document reading apparatus according to the embodiment.

FIG. 6 is an explanatory diagram showing scanning by the document reading device.

FIG. 7 is a side view showing a configuration of a modification of the present embodiment.

[Explanation of symbols]

 Reference Signs List 30 digital copier 40a first scanning unit 40b second scanning unit 41 lamp reflector assembly 41a lamp reflector assembly support 41b reflector support 41c opening 41d insertion portion 100 xenon lamp 101 aperture 101a opening (aperture) 102 reflector 102a Reflecting surface 102b Weakened part 102c Opening 103 Slit 104 Direct irradiation light 105 Indirect irradiation light 121 Lamp holder 204 Drive circuit board 206 Inverter 210 Fixing reflector

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 1/04 101 H04N 1/04 101 (72) Inventor Tetsuji Ito 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka No. Sharp Corporation (72) Inventor Mago Masuda 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka F-term (reference) 2H076 AA04 AA07 AA11 AA58 BA45 BA98 EA06 EA08 2H108 AA01 CB01 DA01 JA04 2H109 AA02 AA15 AA23 AA28 CA12 5B047 AA01 BC09 BC11 BC12 BC20 5C072 AA01 CA02 CA04 CA09 CA10 DA04 XA01

Claims (7)

[Claims] An illumination light source for irradiating a document, a reflection member for reflecting light from the illumination light source, and a drive unit having a heating device for driving the illumination light source, wherein the illumination light source, the reflection member, A document reading device for relatively moving a document and irradiating the document with light from the irradiation light source, wherein a heat conduction path is formed between the reflection member and the heating device. . 2. The apparatus according to claim 1, further comprising: a scanning unit that integrally holds the irradiation light source, the reflecting member, and the driving unit, and scans the scanning unit to read an original.
The document reading device according to 1. 3. The reflection member is provided between a portion where a heat conduction path is formed between the heat-generating device and the reflection portion.
The document reading apparatus according to claim 1, further comprising a holding unit configured to hold the reflection member on the scanning unit. 4. The document reading apparatus according to claim 1, wherein the heat generating device is disposed adjacent to a back side of the reflection surface. 5. The reflection member includes a weakened portion having a bending strength smaller than that of another portion, at least in a portion extending from a portion where a heat conduction path between the heat generating device is formed and the reflection portion. The document reading device according to claim 1, wherein: 6. The scanning unit includes a base for holding the reflection member, the driving unit includes a driving circuit board on which a driving circuit is formed, and the base includes an opening. In the base portion, the heat generating device is disposed so as to penetrate the opening portion and cover the front and back of the base portion, and the drive circuit board is held on the back side on which the reflection member is held. Claim 1
6. The document reading device according to any one of items 1 to 5, 7. The reflection surface of the reflection member is installed to be inclined with respect to the traveling direction of the scanning unit, and the drive circuit board is installed to be inclined to the back side of the reflection surface of the reflection member. The document reading apparatus according to claim 1, wherein the heating device is provided on a reflection member side of the drive circuit board.