JP2007318406A - Image reader and image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image reader that can suppress a rise in temperature of a light emitting element while preventing the manufacturing cost and weight from increasing by efficiently radiating heat of the light emitting element by simple constitution, and also can perform a high-precision read, and an image forming apparatus. <P>SOLUTION: A copying machine 10 is equipped with: a light irradiating means 50 including a plurality of light emitting diodes 43 provided in a horizontal scanning direction of an original and irradiating the original with light and a circuit board 51 driving the light emitting diodes 43; a support member 52 with the light irradiating means 50 fitted thereto; and a first carriage 35 with the support member 52 fitted thereto and traveling in a sub-scanning direction of the original. The copying machine is further equipped with a guide member 53 which guides air to the light irradiating means 50 when the first carriage 35 travels. Further, an oblique directional upper-end portion of a first mirror 44a is made to abut against the support member 52 via a lower-end portion of a base part 35a of the first carriage, then, the first mirror 44a may be used as a guide member. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an image reading apparatus and an image reading apparatus, and for example, an image reading apparatus such as a scanner apparatus provided with a light emitting element that irradiates light to read an original, a facsimile apparatus including the image reading apparatus, and a copying machine The present invention relates to an image forming apparatus such as a multifunction peripheral or a multifunction peripheral.

  In general, in an image reading apparatus such as a facsimile machine, a copier, or a multifunction machine, light is emitted from a light source to a document, and reflected light from the document is folded by a plurality of mirrors and incident on an image sensor such as a CCD image sensor. Like to do.

  21 and 22 are configuration diagrams of a conventional image reading apparatus. In FIGS. 21 and 22, the light emitted from the cylindrical xenon lamp 111 to the document placed on the contact glass 117 is reflected by the first mirror 112 a and then the second mirror 112 b and the third mirror 112 c. They are folded in order.

  The reflected light beam reflected by the third mirror 112 c is imaged on the image sensor 114 such as a CCD image sensor by the imaging lens 113 and is photoelectrically converted by the image sensor 114.

  The xenon lamp 111 and the first mirror 112a are mounted on the first carriage 115, and the second mirror 112b and the third mirror 112c are mounted on the second carriage 116. When reading, the first carriage 115 and the second carriage 116 travel in the sub-scanning direction, and main scanning of the document is performed by the xenon lamp 111, whereby the entire document surface is read.

  In such an image reading apparatus, there are demands for the rise speed of the light source, energy saving, longer life, etc. Recently, light emitting elements such as light emitting diodes are arranged in an array instead of a xenon lamp. There is a tendency to adopt a light source.

  In order to improve the productivity (number of copies, etc.), it is necessary to increase the illuminance of the light emitting diode. To increase the illuminance of the light emitting diode, a large current is passed through the light emitting diode or the light emitting diode. Therefore, it is necessary to take measures such as increasing the integration density.

  On the other hand, when the illuminance of the light emitting diode is increased, the light emitting diode generates heat. Therefore, it is indispensable to take measures against heat dissipation as a failure resistance, and suppress the decrease in illuminance and chromaticity change of the light emitting element due to heat generation. Therefore, a device for efficiently dissipating and cooling the light emitting diode has been devised.

As a heat dissipation method of a conventional light source, a heat dissipation substrate in which a light emitting element array is arranged, a heat pipe that is positioned substantially parallel to the arrangement direction of a large number of array elements in the light emitting element array and embedded in the heat dissipation substrate, There is a cooling device for a light emitting element array composed of heat dissipating fins arranged at at least one end of a heat pipe (see, for example, Patent Document 1).
In addition, by providing a recess in the vicinity of the housing that houses the LED lighting, inside the outer shape of the housing, it serves as a heat radiating fin and suppresses the temperature rise of the unit due to the heat generated by the light emission of the LED lighting light source. There are some (see, for example, Patent Document 2).
Japanese Utility Model Publication No. 4-135349 Japanese Patent No. 3336069

  However, in the heat radiation method of the light source shown in Patent Document 1, since it is necessary to provide a heat pipe and a heat radiation fin, the heat pipe and the heat radiation fin are attached to a traveling body that travels the light emitting element array in the sub-scanning direction of the document. In the case of mounting, it is difficult in terms of space, and there is a problem that the weight of the traveling body increases and the load during traveling increases. Furthermore, since the number of parts increases, the manufacturing cost of the image reading apparatus increases.

  Moreover, what is shown in patent document 2 is only a thing which provides a recessed part in a housing, and becomes a thing which increased the surface area for heat dissipation, and cannot anticipate the big heat dissipation effect.

  The present invention has been made to solve the conventional problems, and efficiently dissipates heat from the light-emitting element with a simple configuration, thereby suppressing an increase in manufacturing cost and weight and suppressing an increase in temperature of the light-emitting element. An object of the present invention is to provide an image reading apparatus and an image forming apparatus that can perform high-precision reading.

  The image reading apparatus according to the present invention includes a light irradiating unit provided with a plurality of light emitting elements that illuminate the original with light and a circuit board that drives the light emitting elements, and the light irradiating unit. A guide member that guides air to the light irradiating means when the traveling means travels in an image reading apparatus comprising: a supporting means to which the traveling means is attached; and a traveling means to which the supporting means is attached and travels in the sub-scanning direction of the document It is comprised from what provided.

  With this configuration, since the guide member that guides air to the light irradiation unit when the traveling unit travels is provided, the light irradiation unit can efficiently dissipate heat. For this reason, it can suppress that the temperature of a light emitting element rises, preventing the manufacturing cost and weight of an image reading apparatus increasing.

  In addition, since the temperature of the light emitting element can be suppressed from increasing, a decrease in illuminance and a change in chromaticity due to heat generation of the light emitting element can be suppressed, and the image reading performance can be improved.

Further, the guide member of the image reading apparatus of the present invention is configured to guide air to the light emitting element.
With this configuration, air is directly guided to the light emitting element by the guide member during traveling of the traveling means, so that the light emitting element can be efficiently radiated and the temperature of the light emitting element can be prevented from rising.

Further, the guide member of the image reading apparatus of the present invention is configured to guide air to the support means.
With this configuration, air is guided to the support means by the guide member during travel of the travel means, so that heat transmitted from the light irradiation means to the support means can be efficiently dissipated, and an increase in the temperature of the light emitting element is suppressed. be able to.

  The light irradiation means of the image reading apparatus of the present invention includes a cover member that covers a part of the light emitting element and prevents scattering of the light emitting element, and the guide member guides air to the cover member. It is composed of

  With this configuration, since air is guided to the cover member by the guide member during traveling of the traveling unit, the heat transmitted from the light irradiation unit to the support unit can be efficiently radiated, and the temperature of the light emitting element is prevented from rising. be able to.

  In addition, the image reading apparatus of the present invention is attached to the traveling means so as to face the light irradiating means and the supporting means in the sub-scanning direction, and reflects the light emitted from the emitting element to the document. And a guide member provided on the reflecting means.

  With this configuration, air is guided to the light irradiating means by using the reflecting member attached to the traveling means so as to face the light irradiating means and the supporting means in the sub-scanning direction when the traveling means is traveling. The light irradiation means can be efficiently radiated using existing components. For this reason, it is possible to prevent the temperature of the light emitting element from rising while further preventing an increase in manufacturing cost and weight of the image reading apparatus.

  Further, the guide member of the image reading apparatus according to the present invention is configured to be provided in the support means and guide air to the light emitting element through the guide member.

  With this configuration, air is guided to the light irradiation means by the guide member provided directly on the support means when the traveling means is traveling, so that the light irradiation means can efficiently dissipate heat. For this reason, it is possible to prevent the temperature of the light emitting element from rising while further preventing an increase in manufacturing cost and weight of the image reading apparatus.

  In addition, a mirror member that is inclined at a predetermined angle is attached to the traveling unit of the image reading apparatus of the present invention so that the light emitted from the light emitting element to the original and reflected from the original is turned back toward the image sensor. The mirror member is configured to use the mirror member as the guide member by bringing the upper end portion in the tilt direction of the mirror member into contact with the lower end portion of the support means directly or via the traveling means.

  With this configuration, since the air is guided to the light irradiating means using the mirror member when the traveling means is traveling, the light irradiating means can efficiently dissipate heat. For this reason, it is possible to prevent the temperature of the light emitting element from rising while further preventing an increase in manufacturing cost and weight of the image reading apparatus.

  Further, since the upper end of the mirror member in the inclination direction is brought into contact with the lower end of the support means via the traveling means, it is possible to eliminate windage loss during traveling of the traveling means, and to efficiently guide the air to the light irradiation means. be able to.

  In addition, a mirror member that is inclined at a predetermined angle is attached to the traveling unit of the image reading apparatus of the present invention so that the light emitted from the light emitting element to the original and reflected from the original is turned back toward the image sensor. The upper end portion in the sub-scanning direction of the mirror member is configured to be provided in a direction in which the traveling means travels to the reading side with respect to the light emitting element.

  With this configuration, since the air is guided to the light irradiating means using the mirror member when the traveling means is traveling, the light irradiating means can efficiently dissipate heat. For this reason, it is possible to prevent the temperature of the light emitting element from rising while further preventing an increase in manufacturing cost and weight of the image reading apparatus.

  In addition, since the upper end portion of the mirror member in the sub-scanning direction is provided in the direction in which the traveling means travels to the reading side with respect to the light emitting element, it is possible to eliminate windage loss during traveling of the traveling means and It can be efficiently guided to the irradiation means.

  In addition, a mirror member that is inclined at a predetermined angle is attached to the traveling unit of the image reading apparatus of the present invention so that the light emitted from the light emitting element to the original and reflected from the original is turned back toward the image sensor. The guide member is composed of an extension portion extending from the traveling means to the upper end portion in the inclination direction of the mirror member.

  With this configuration, since the air is guided to the light irradiating means using the mirror member when the traveling means is traveling, the light irradiating means can efficiently dissipate heat. For this reason, it is possible to prevent the temperature of the light emitting element from rising while further preventing an increase in manufacturing cost and weight of the image reading apparatus.

  Further, since the guide member is composed of the extending portion that extends from the traveling means to the upper end of the mirror member in the inclination direction, it is possible to eliminate windage loss during traveling of the traveling means, and to efficiently apply air to the light irradiation means. Can lead.

  The image reading apparatus according to the present invention includes an auxiliary guide member attached to the traveling unit so as to face the light irradiation unit and the support unit in the sub-scanning direction.

  With this configuration, it is possible to form an air passage that is guided from the mirror member to the light emitting element and the supporting means by the light irradiation means, the supporting means, and the auxiliary guide member, and efficiently guides air from the mirror member to the light emitting element and the supporting means. be able to.

  For this reason, the light emitting element can be efficiently cooled, the support means can be efficiently radiated, and the temperature and temperature of the light emitting element can be increased while further preventing an increase in manufacturing cost and weight of the image reading apparatus. Can be suppressed.

  In addition, the guide member of the image reading apparatus of the present invention is constituted by a groove portion formed inside the support means, and air is guided to the inside of the support means by the groove portion.

  With this configuration, air is guided to a groove portion as a guide member formed inside the support means during travel of the travel means, so that heat transmitted from the irradiation means to the support means can be efficiently radiated, and simple. The temperature rise of the light emitting element can be suppressed by the configuration.

Further, the image reading apparatus of the present invention is configured such that an opening is formed at the bottom of the support means, and air is guided into the opening through the mirror member.
With this configuration, since air is guided from the mirror member into the opening, the heat transmitted from the light irradiation means to the support means can be efficiently radiated, and the light emitting element can be cooled.

  The image reading apparatus according to the present invention further includes a traveling unit that varies a traveling speed when the traveling unit travels in one direction and the other in the main scanning direction, and the cover member has a surface that covers the light emitting element. It is comprised from what the driving | running | working means opposes in the fast direction.

  With this configuration, since the surface of the cover member that covers the light emitting element is opposed to the direction in which the traveling speed of the traveling means is high, the guide member can dissipate heat when the traveling means travels at high speed, and the cover member emits light. Since cold air can be guided to the element, the temperature of the light emitting element can be further suppressed from increasing.

Further, the support means of the image reading apparatus of the present invention is made of a material having a higher thermal conductivity than the circuit board.
With this configuration, a large amount of heat transmitted from the light irradiation means to the support means can be efficiently radiated.

Further, the circuit board of the image reading apparatus of the present invention is constituted by a notch part formed on a part of the mounting surface of the light emitting element.
With this configuration, the air guided from the guide member to the light irradiation means can be guided to the light emitting element through a notch formed in a part of the mounting surface of the light emitting element, so that the light emitting element is efficiently cooled. And the temperature of the light emitting element can be further suppressed from increasing.

  The image reading apparatus of the present invention includes an image forming unit that forms an image on a recording medium and includes the above-described image reading apparatus.

  With this configuration, since the guide member that guides air to the light irradiation unit when the traveling unit travels is provided, the light irradiation unit can efficiently dissipate heat. For this reason, it can suppress that the temperature of a light emitting element rises, preventing the manufacturing cost and weight of an image reading apparatus increasing.

  Accordingly, the temperature rise of the light emitting element can be suppressed, so that a decrease in illuminance and a change in chromaticity due to heat generation of the light emitting element can be suppressed, and image reading performance can be improved. An apparatus can be provided.

  Also provided is an image forming apparatus capable of uniform reading of heat transmitted from the light irradiating means to the supporting means, uniforming the heat radiation amount of the plurality of light emitting elements, and performing highly accurate reading without uneven illuminance. can do.

  The present invention can efficiently dissipate a light emitting element with a simple configuration, suppress an increase in manufacturing cost and weight, suppress an increase in temperature of the light emitting element, and perform highly accurate reading. An image reading apparatus and an image forming apparatus can be provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 6 are diagrams showing a first embodiment of an image reading apparatus and an image forming apparatus provided with the image reading apparatus according to the present invention, and show an example in which the image forming apparatus is applied to a copying machine. . The image forming apparatus is not limited to a copying machine, but can be applied to an image forming apparatus such as a facsimile machine or a multifunction machine having a copying function and a facsimile function.

  First, the configuration will be described. In FIG. 1, a copying machine 10 includes an automatic document feeder (hereinafter simply referred to as ADF) 11, a paper feeding unit 12, an image reading unit (image reading device) 13, and an image forming unit (image forming unit) 14. .

  The ADF 11 conveys the document placed on the document tray 16 onto the contact glass 15 by the separation feeding unit 17 including various rollers such as a feeding roller and a separation roller, and contacts the document after reading by the conveyance belt 18. After unloading from the glass 15, the paper is discharged onto a paper discharge tray 20 by a paper discharge means 19 comprising various paper discharge rollers.

  When reading both sides of the document, the document is returned onto the contact glass 15 by the branching mechanism provided on the paper discharge means 19 and the conveyor belt 18 to read the unread surface.

  The paper feeding unit 12 includes paper feeding cassettes 21a and 21b that store recording papers of different sizes, and paper feeding means 22 including various rollers that transport the recording papers stored in the paper feeding cassettes 21a and 21b to an image forming position. It has.

  As will be described in detail later, the image reading unit 13 drives the first carriage 35 and the second carriage 36 in the left-right direction (sub-scanning direction) in FIG. The surface is read, and the reading light is reflected by a mirror, and then taken into an image reading sensor such as a CCD by the lens unit 37.

  The image forming unit 14 includes an exposure device 23 that forms a write signal based on a read signal taken into the lens unit, a plurality of photosensitive drums 24 on which a write signal generated by the exposure device 23 is formed, A developing device 25 that is filled with toners of different colors and supplies different color toners to the respective photosensitive drums 24 to visualize the writing signals, and a visible image formed on the photosensitive drums 24 are superimposed. A transfer belt 26 for transferring the color image onto the recording paper fed from the paper supply unit 12, and a fixing for fixing the color image fixed on the recording paper to the recording paper. Device 27.

  2 and 3 are diagrams showing the configuration of the image reading unit 13. FIG. 2 is a side view showing the positional relationship between the components of the image reading unit 13. FIG. 3 is a schematic diagram for explaining the relationship between the driving wire 33 for driving the second carriage 36 and each pulley. FIG. 3A is a side view, and FIG. 3B is a diagram showing the connection state of the drive wires 33 as viewed from above.

  2 and 3, the image reading device 13 includes a main body frame 31, a drive shaft 32, a drive wire 33, a wire drive pulley 34, a first carriage 35, a second carriage 36, a lens unit 37, a tension spring 39, and a carriage pulley 40. , Idler pulleys 41 and 42 and an image sensor 57 are provided.

  A first rail and a second rail (not shown) are provided inside the main body frame 31, and a first carriage 35 as a traveling body is slidably attached to the first rail, and the second rail is attached to the first rail. The second carriage 36 is slidably attached.

  The drive shaft 32 is connected to a motor (not shown), and wire drive pulleys 34 are attached to both ends of the drive shaft. A drive wire 33 is wound around the wire drive pulley 34, and the drive wire 33 extends in the left-right direction in FIG. 3, which is a predetermined direction.

  Two drive wires 33 are used for driving the first carriage 35 and for driving the second carriage 36. FIG. 3 shows the drive wire 33 for driving the second carriage 36.

The drive wire 33 and the idler pulleys 41 and 42 are provided one by one on the front and rear sides of the main body frame 31, respectively, but since both have the same configuration and function, the one-side drive wire 33 and the idler pulleys 41 and 42 will be described. do. That is, in the present embodiment, two wires 33 and four idler pulleys 41 and 42 are provided at the four corners of the main body frame 31.
The second carriage 36 is provided with a carriage pulley 40, and the drive wire 33 passes through the carriage pulley 40 and idler pulleys 41 and 42.

  As shown in FIGS. 4 and 5, the first carriage 35 is provided with a flat circuit board 51 having a plurality of light emitting diodes 43 as light emitting elements. The light emitting diodes 43 and the circuit board 51 are irradiated with light. The means 50 is comprised. The light emitting diode 43 of the present embodiment is a side view type that emits light in the mounting plane direction of the circuit board 51.

  A plurality of light emitting diodes 43 are provided along the main scanning direction, and the circuit board 51 controls the light emission of the light emitting diodes 43. The circuit board 51 is fixed to a support member 52 as a support means by a screw 58. The support member 52 is formed in a substantially V-shaped cross section and is attached to the base portion 35a of the first carriage 35 by a screw (not shown). Yes.

  The support member 52 of the present embodiment is made of a metal such as sheet metal or aluminum, and the support member 52 is formed by press molding that bends one thin plate into a substantially U-shape, or die casting. . The circuit board 51 is made of glass epoxy, and the thermal conductivity of the support member 52 is higher than that of the circuit board 51.

  A first mirror 44a as a mirror member is mounted on the lower guide plate 35b of the first carriage 35. Light emitted from the light emitting diode 43 to the original and reflected from the original is formed on the base 35a. The light enters the first mirror 44a through the opening 35c.

  The first carriage 35 is disposed between the wire drive pulley 34 and the second carriage 36, and when the first carriage 35 is pulled by the drive wire 33 and travels at a predetermined speed V, the light irradiation means 50 is contacted with the contact glass 15. The document placed on is sub-scanned.

  When the original is irradiated from the light emitting diode 43, the reflected light beam of the original is folded back toward the second carriage 36 by the first mirror 44 a, and this reflected light flux is mounted on the second carriage 36. After further folding back by the second mirror 44b and the third mirror 44c, the light enters the lens unit 37.

  Then, this reflected light beam is focused and imaged on an image sensor 57 such as a CCD placed on the focal plane by an imaging lens included in the lens unit 37. As a result, the image sensor 57 performs main scanning on the line on the document along the light emitting diode 43.

  In addition, the second carriage 36 cancels the overlapping of the optical path caused by the return of the light flux by the second mirror 44b and the third mirror 44c, so that the first carriage 35 has a speed that is half the speed of the first carriage 35, that is, a speed of V / 2. It travels in the same direction as the carriage 35, and the second carriage 36 travels at a travel distance (L / 2) that is half the travel distance L of the first carriage 35.

  Due to this travel speed relationship, even if the first carriage 35 and the second carriage 36 travel, the optical path length of the light flux from the document surface to the lens unit 37 does not change.

  On the other hand, the drive wire 33 includes two systems that are wound around the wire drive pulley 34 and extend in the left direction and the right direction. The portion 33a of the drive wire extending in the left direction is folded back by an idler pulley 41 whose shaft is fixed to the main body frame 31, reaches a portion 33b, reaches the outer carriage pulley 40b, and is folded again here to become a portion 33c. The part is fixed to the idler pulley 41.

  Further, the portion 33d of the drive wire 33 extending rightward is folded back by an idler pulley 42 fixed to the main body frame 31 to become a portion 33e to reach the inner carriage pulley 40a, where it is folded back again to become a portion 33f. It is fixed to the idler pulley 42 via a tension spring 39 as a spring member.

  Further, a home position sensor (not shown) is provided on the left side in FIG. 2, and a first motor 35 travels to the left side in FIG. 2 and passes through the home position sensor to drive a drive shaft 32. When driven only by pulses, the motor is stopped.

At this time, the wire drive pulley 34 is stopped via the drive shaft 32. This position becomes the home position position of the first carriage 35. When the reading of the document is finished, the first carriage 35 always travels to the home position position and travel is started again from this position.
In the present embodiment, the motor, the drive shaft 32, the drive wire 33, the wire drive pulley 34, the carriage pulley 40, and the idler pulleys 41 and 42 constitute a traveling means.

In addition, the first carriage 35 and the second carriage 36 of the present embodiment travel in the scanning direction on the right side in FIG. When returning to the position, the vehicle travels in the return direction on the left side in FIG.
When the vehicle travels in the return direction, it is not affected by the reading speed of the document, and therefore travels at a high speed in order to increase the productivity of the document.

  On the other hand, a guide member 53 is attached to the first carriage 35, and this guide member 53 faces the light irradiation means 50 and the support member 52 in the return side sub-scanning direction. Further, a bent portion 53a is formed on the upper portion of the guide member 53, and the bent portion 53a is bent in the sub-scanning direction on the return side. In addition, a through hole 53 b is formed in the guide member 53, and the through hole 53 b opens at substantially the same height as the light emitting diode 43.

  Further, the first carriage 35, the guide member 53, and the lower guide plate 35b of the present embodiment are integrally formed with a mold resin.

  In the copying machine 10 having such a configuration, the first carriage 35 and the second carriage 36 are caused to travel in the main scanning direction, so that light is emitted from the light emitting diode 43 to the document surface.

  The reflected light beam of the document is folded back in the order of the first mirror 44a, the second mirror 44b, and the third mirror 44c, then enters the lens unit 37, and is placed on the focal plane by the imaging lens of the lens unit 37. The light is focused on. Thereby, the image sensor 57 scans the line on the document along the light emitting diode 43 in the main scanning direction and the sub scanning direction.

  When the reading of the document is completed, the first carriage 35 and the second carriage 36 are moved in the return direction and are moved to the home position. At the time of reading a document, the light emitting diode 43 as a heat source becomes high temperature, and the heat of the light emitting diode 43 is transmitted to the support member 52 through the circuit board 51, so that the light emitting diode 43 is dissipated by radiating the support member 52. It needs to be cooled.

  In the present embodiment, a guide member 53 is provided so as to face the light irradiation means 50 in the return-side sub-scanning direction, and a bent portion 53 a that is bent in the return-side sub-scanning direction is formed on the guide member 53. Therefore, air can be collected by the guide member 53 when the first carriage 35 travels in the return direction.

  Further, since the through hole 53b that opens at substantially the same height as the light emitting diode 43 is formed in the guide member 53, the air collected by the guide member 53 can be guided to the light emitting diode 43 through the through hole 53b.

  For this reason, the light emitting diode 43 can be efficiently radiated with a simple configuration, and an increase in the temperature of the light emitting diode 43 can be suppressed while preventing an increase in manufacturing cost and weight of the copying machine 10. .

  Further, since it is possible to suppress the temperature of the light emitting diode 43 from rising, it is possible to suppress a decrease in illuminance and a change in chromaticity due to heat generated by the light emitting diode 43, and to improve image reading performance. .

  In the present embodiment, the through hole 53b is opened at substantially the same height as the light emitting diode 43. However, as shown in FIG. 6, the through hole is formed at a position facing the support member 52 below the light emitting diode 43. 53c may be provided.

  In this way, air can be guided to the support member 52 by the guide member 53 when the first carriage 35 travels, and the heat transmitted from the light irradiation means 50 to the support member 52 can be efficiently radiated from the support member 52. It is possible to suppress the temperature of the light emitting diode 43 from rising.

  Further, since the support member 52 has a higher thermal conductivity than the circuit board 51, a large amount of air transmitted from the circuit board 51 to the support member 52 when air is guided to the light emitting diode 43 by the guide member 53. Heat can also be radiated efficiently, and the light emitting diode 43 can be cooled more efficiently.

  FIG. 7 is a diagram showing a second embodiment of an image reading apparatus and an image forming apparatus provided with the image reading apparatus according to the present invention. The same reference numerals are given to the same components as those in the first embodiment. The description is omitted.

  As shown in FIG. 7, the first carriage 35 is provided with a cover member 61 that constitutes a light irradiation means, and this cover member 61 covers a part of the light emitting diode 43 to prevent scattering of the light emitting diode 43. It has a function.

  Further, the cover member 61 faces the light emitting diode 43 in the return direction where the traveling speed of the first carriage 35 is high, and the through hole 53 b of the guide member 53 is substantially the same as the cover member 61 and the light emitting diode 43. Open at height.

  In the present embodiment, when the first carriage 35 travels in the return direction, air is collected by the guide member 53, and the air collected by the guide member 53 is guided to the light emitting diode 43 and the cover member 61 through the through hole 53b. it can.

  Further, since the cover member 61 faces the light emitting diode 43 in the return direction in which the traveling speed of the first carriage 35 is high, the air guided from the guide member 53 to the cover member 61 is guided to the light emitting diode 43. Can do.

  Accordingly, the heat transmitted from the light emitting diode 43 to the cover member 61 can be radiated from the cover member 61 with a simple configuration, and the light emitting diode 43 itself can also be radiated efficiently, and the temperature of the light emitting diode 43 increases. Can be suppressed.

  In addition, since the temperature of the light emitting diode 43 can be further suppressed, a decrease in illuminance and a change in chromaticity due to heat generated by the light emitting diode 43 can be further suppressed, and the image reading performance can be further improved. This can be further improved.

  FIGS. 8 to 10 are views showing a third embodiment of an image reading apparatus and an image forming apparatus provided with the image reading apparatus according to the present invention. The same reference numerals are used for the same components as those in the first embodiment. The description is omitted.

  The present embodiment is characterized in that a dedicated guide member is eliminated and a reflector is used as the guide member. In FIG. 8, a reflector (reflecting means) 62 is provided so as to face the light irradiation means 50 in the return side sub-scanning direction, and the upper part of the reflector 62 contacts the light emitted from the light emitting diode 43. A bent portion 62a is formed that is bent in the auxiliary travel direction on the return side so that the glass 15 can be guided to the original.

  Therefore, since the irradiation light from the light emitting element 43 is reflected on the document surface by the bent portion 62a, it is possible to eliminate the shadow caused by the step of the document when the cut and pasted document is read.

  The reflector 62 is formed with a through-hole 62b that opens at substantially the same height as the light-emitting diode 43. When the first carriage 35 travels in the return direction, air collected by the reflector 62 is passed through the through-hole 62b. It is led to the light-emitting diode 43 through.

  In the present embodiment, as shown in FIG. 9, a plurality of through holes 62b are formed along the main scanning direction of the reflector 62 so that the bending strength of the reflector 62 in the main scanning direction is not lowered. It is preferable.

  As described above, in the present embodiment, the reflector 62 is used as a guide member that guides air to the light emitting diode 43 when the first carriage 35 travels. Therefore, the light emitting diode 43 can be efficiently radiated with a simple configuration. It is possible to suppress the temperature of the light emitting diode 43 from rising.

  Further, since the reflector 62 is used as a guide member, it is not necessary to provide a dedicated guide member, and the manufacturing cost of the copying machine 10 can be further reduced.

  In the present embodiment, air is guided to the light emitting diode 43 by the reflector 62, but the height of the through hole 62b is set to the same height as the cover member 61 and the support member 52 as in the second embodiment. In this case, the cover member 61 and the support member 52 may be radiated.

  Further, as shown in FIG. 10, a reflector 63 having a bent portion 63a bent in the return-side sub-running direction is provided, and a lower portion of the through-hole 63b of the reflector 63 is bent toward the return direction to be bent 63c. May be formed.

  In this way, when the first carriage 35 travels in the return direction, the air can be efficiently guided by the light emitting diode 43 if the bent portion 63c guides the air to the through hole 63a.

  FIG. 11 is a diagram showing a fourth embodiment of an image reading apparatus and an image forming apparatus provided with the image reading apparatus according to the present invention. The same reference numerals are given to the same components as those in the first embodiment. The description is omitted.

  In the present embodiment, as shown in FIG. 11, a groove 52a divided along the main scanning direction is formed inside the support member 52, and this groove 52a functions as a guide member, so that the first carriage 35 travels. In some cases, the temperature of the light emitting diode 43 is prevented from rising by guiding the air to the groove 52a to dissipate the support member 52.

  Alternatively, the through holes 62a and 63a of the reflectors 62 and 63 may be eliminated so that the reflector functions as the reflector 60 without functioning as the guide member. In this case, when the first carriage 35 travels in the return direction, air can be guided through the groove portion 52a through the bent portion 60a of the reflector 60 and the opening portion 35c of the base portion 35a.

  FIG. 12 is a diagram showing a fifth embodiment of an image reading apparatus and an image forming apparatus provided with the image reading apparatus according to the present invention. The same reference numerals are given to the same components as those in the first embodiment. The description is omitted.

  In the present embodiment, instead of providing a guide member at a position facing the light irradiation means 50, an extended portion 52 b is provided on the support member 52. The extending portion 52b is inclined in the return direction from the upper portion of the support member 52 directly below the light emitting diode 43, and when the first carriage 35 travels in the return direction, the extending portion 52b is provided in the light emitting diode 43. Air is led to the light emitting diode 43 through the through hole.

  As described above, in the present embodiment, since the extending portion 52b as a guide member for guiding air to the light emitting diode 43 is provided on the support member 52, the light emitting diode 43 is driven by the extending portion 52b when the first carriage 35 travels. The air can be led to the light emitting diode 43 and the light emitting diode 43 can be cooled.

  FIGS. 13 to 16 are views showing a sixth embodiment of an image reading apparatus and an image forming apparatus provided with the image reading apparatus according to the present invention. The same reference numerals are used for the same components as those in the first embodiment. The description is omitted.

  The present embodiment is characterized in that the first mirror 44a is used as a guide member. In FIG. 13, the first mirror 44a attached to the lower guide plate 35b is inclined at a predetermined angle (about 45 degrees) so that the reflected light beam is folded back onto the second mirror 44b, and the upper end in the inclination direction of the first mirror 44a. The portion is in contact with the lower end portion of the support member 71 via the base portion 35 a of the first carriage 35. Therefore, when the first carriage 35 travels in the return direction, air is guided to the support member 51 and the light emitting diode 43 through the first mirror 44a.

  In the present embodiment, air can be guided to the light emitting diode 43 and the support member 71 by the first mirror 44a during the travel of the first carriage 35, and the light emitting diode 43 can be cooled.

  In addition, since the upper end of the tilt direction of the first mirror 44a is brought into contact with the lower end of the support member 71 via the base 35a, it is possible to eliminate windage loss during the travel of the first carriage 35 and The light irradiation means 50 can be efficiently guided.

  As shown in FIG. 14, the light irradiation means 50 is provided with an auxiliary guide member 63 in the sub-scanning direction with respect to the support member 71, and the first mirror 44a is formed by the light irradiation means 50, the support member 71, and the auxiliary guide member 63. Alternatively, an air passage led from the light emitting diode 43 to the support member 71 may be formed.

  In this way, air can be efficiently guided from the first mirror 44 a to the light emitting diode 43 and the support member 71. For this reason, while being able to cool the light emitting diode 43 efficiently, the support member 71 can be thermally radiated efficiently and it can suppress that the temperature of the light emitting diode 43 rises.

  In addition, in order to eliminate windage loss when the first carriage 35 travels and to guide the air from the first mirror 44a to the light emitting diode 43 and the support member 71, as shown in FIG. 15, the upper end of the mirror member in the sub-scanning direction is provided. The first carriage 35 may be provided with respect to the light emitting diode 43 in the direction of traveling to the reading side (right side in FIG. 1).

  Further, as shown in FIG. 16, the auxiliary guide member may be constituted by a reflector 67. In this case, a bent portion 67 a that reflects the irradiation light from the light emitting diode 43 may be provided above the reflector 67.

  17 to 19 are views showing a seventh embodiment of an image reading apparatus and an image forming apparatus provided with the image reading apparatus according to the present invention. The same reference numerals are used for the same configurations as those in the first embodiment. The description is omitted.

  As shown in FIGS. 17 and 18, a plurality of openings 72 a that open toward the first mirror 44 a along the main scanning direction are formed at the bottom of the support member 72, and the upper end of the first mirror 44 a in the tilt direction is formed. The portion is in contact with the lower end portion of the support member 72.

  Therefore, when the first carriage 35 travels in the return direction, air can be guided to the opening 72a through the first mirror 44a, and the heat transmitted from the light irradiation means 50 to the support member 72 can be efficiently radiated. It is possible to suppress the temperature of the light emitting diode 43 from rising.

  Further, by providing the reflector 60 on the return side in the sub-scanning direction of the light emitting diode 43 and the support member 72, in addition to the function as a reflector, the light irradiation means 50, the support member 72, and the reflector 60 remove the first mirror 44a. You may make it form the channel | path of the air guide | induced to the opening part 72a.

  In order to eliminate windage loss during travel of the first carriage 35, the upper end portion in the tilt direction of the first mirror 44a is not brought into contact with the lower end portion of the support member 72, but as shown in FIG. An extension portion 65 extending from the first to the first mirror 44a may be provided.

  In each of the above embodiments, the light emitting diode 43 is mounted on the circuit board 51. However, as shown in FIG. 20, a notch 66 is formed in the circuit board 51, and a part of the light emitting diode 43 is formed. You may mount on the notch part 66. FIG.

In this way, the air guided from the guide member to the light irradiating means 50 can be guided to the light emitting diode 43 through the notch portion 66, so that the light emitting diode 43 can be efficiently cooled and the light emitting diode 43 can be cooled. It is possible to further suppress the temperature rise.
In each of the above embodiments, a light emitting diode is used as a light emitting element, but an EL (Electronic Luminescent) may be used.

  As described above, the image reading apparatus and the image forming apparatus according to the present invention efficiently dissipate heat from the light emitting element with a simple configuration, and prevent an increase in manufacturing cost and weight while suppressing an increase in temperature of the light emitting element. And an image reading device such as a scanner device having a light emitting element for irradiating the original with light to read the original and the image reading device. It is useful as an image forming apparatus such as a facsimile machine, a copying machine, or a multifunction machine.

1 is a schematic configuration diagram of an image forming apparatus according to a first embodiment of the present invention. 1 is a side view showing the positional relationship of components of an image reading apparatus according to a first embodiment of the present invention. (A) is a schematic front view of the image reading apparatus according to the first embodiment of the present invention, and (b) is a schematic perspective view of the image reading apparatus. 1 is a perspective view of a light irradiation unit and a support member of an image reading apparatus according to a first embodiment of the present invention. AA arrow sectional view of FIG. Sectional drawing which shows the light irradiation means of the image reading apparatus which concerns on the 1st Embodiment of this invention, a support member, and the other structure of the circumference | surroundings Sectional drawing which shows the structure of the light irradiation means of the image forming apparatus which concerns on the 2nd Embodiment of this invention, a support member, and its periphery Sectional drawing which shows the light irradiation means of the image forming apparatus which concerns on the 3rd Embodiment of this invention, a support member, and other structure of the circumference | surroundings Reflector perspective view of an image forming apparatus according to a third embodiment of the present invention Sectional drawing which shows the structure of the light irradiation means of the image forming apparatus which concerns on the 3rd Embodiment of this invention, a support member, and its periphery Sectional drawing which shows the structure of the light irradiation means of the image forming apparatus which concerns on the 4th Embodiment of this invention, a support member, and its periphery Sectional drawing which shows the structure of the light irradiation means of the image forming apparatus which concerns on the 5th Embodiment of this invention, a support member, and its periphery Sectional drawing which shows the light irradiation means of the image forming apparatus which concerns on the 6th Embodiment of this invention, a support member, and the surrounding structure Sectional drawing which shows the light irradiation means of the image forming apparatus which concerns on the 6th Embodiment of this invention, a supporting member, and the other structure of the circumference | surroundings Sectional drawing which shows the light irradiation means of the image forming apparatus which concerns on the 6th Embodiment of this invention, a supporting member, and the other structure of the circumference | surroundings Sectional drawing which shows the light irradiation means of the image forming apparatus which concerns on the 6th Embodiment of this invention, a supporting member, and the other structure of the circumference | surroundings Sectional drawing which shows the light irradiation means of the image forming apparatus which concerns on the 7th Embodiment of this invention, a support member, and the structure of the circumference | surroundings The perspective view when the support member and light irradiation means of the image forming apparatus which concern on the 7th Embodiment of this invention are seen from the back side Sectional drawing which shows the light irradiation means of the image forming apparatus which concerns on the 7th Embodiment of this invention, a support member, and the other structure of the circumference | surroundings 1 is a perspective view of a main part of a light irradiation unit of an image forming apparatus according to first to seventh embodiments of the present invention. Schematic configuration diagram of a conventional image reading apparatus Schematic diagram of conventional light source and surrounding area

Explanation of symbols

10 Copying machine (image forming device)
13 Image reading unit (image reading device)
14 Image forming unit (image forming means)
32 Drive shaft (traveling means)
33 Drive wire (traveling means)
34 Wire drive pulley (traveling means)
35 First carriage (running body)
40 Carriage pulley (traveling means)
41, 42 idler pulley (traveling means)
43 Light Emitting Diode (Light Emitting Element)
44a First mirror (mirror member)
DESCRIPTION OF SYMBOLS 50 Light irradiation means 51 Circuit board 52, 71, 72 Support member 52a Groove part 52b Extension part 53 Guide member 53b, 53c Through-hole 61 Cover member 62, 63 Reflector (reflection means)
62b, 63b Through-hole 63 Auxiliary guide member 65 Extension portion 66 Notch portion 67 Reflector (auxiliary guide member)
72a opening

Claims (16)

A plurality of light emitting elements provided along the main scanning direction of the document, and a light irradiating unit including a light emitting element for irradiating light on the document and a circuit board for driving the light emitting element; In the image reading apparatus provided with the supporting means and the traveling means for traveling in the sub-scanning direction of the document,
An image reading apparatus, comprising: a guide member that guides air to the light irradiation unit when the traveling unit is traveling. The image reading apparatus, wherein the guide member guides air to the light emitting element. The image reading apparatus, wherein the guide member guides air to the support means. 2. The image reading apparatus according to claim 1, wherein the light irradiation unit includes a cover member that covers a part of the light emitting element and prevents scattering of the light emitting element, and the guide member guides air to the cover member. A reflection unit that is attached to the traveling unit so as to face the light irradiation unit and the support unit in a sub-scanning direction, and that guides the light emitted from the emitting element to the document;
The image reading apparatus according to claim 1, wherein the guide member is provided in the reflection unit. The image reading apparatus according to claim 2, wherein the guide member is provided in the support unit and guides air to the light emitting element through the guide member. The traveling means is attached with a mirror member that is inclined at a predetermined angle so that light emitted from the light emitting element to the original and reflected from the original is folded back toward the image sensor.
2. The mirror member is used as the guide member by bringing an upper end portion of the mirror member in an inclination direction into contact with a lower end portion of the support unit directly or via the traveling unit. The image reading apparatus according to claim 6. The traveling means is attached with a mirror member that is inclined at a predetermined angle so that light emitted from the light emitting element to the original and reflected from the original is folded back toward the image sensor.
The upper end portion in the sub-scanning direction of the mirror member is provided in a direction in which the traveling unit travels toward the reading side with respect to the light emitting element. Image reading apparatus. The traveling means is attached with a mirror member that is inclined at a predetermined angle so that light emitted from the light emitting element to the original and reflected from the original is folded back toward the image sensor.
7. The image reading apparatus according to claim 1, wherein the guide member includes an extending portion that extends from the traveling unit to an upper end portion in an inclination direction of the mirror member. . The auxiliary guide member attached to the traveling means so as to face the light irradiation means and the support means in a sub-scanning direction is provided. The image reading apparatus described in 1. The said guide member is comprised from the groove part formed in the inside of the said support means, The air is guide | induced to the inside of a support means by the said groove part, Claim 3, Claim 5, Claim 7-Claims characterized by the above-mentioned. The image reading apparatus according to any one of 10. The image reading apparatus according to claim 7, wherein an opening is formed in a bottom portion of the support unit, and air is guided into the opening through the mirror member. A traveling means for varying the traveling speed when traveling the traveling means in one and the other in the main scanning direction;
13. The image reading apparatus according to claim 4, wherein a surface of the cover member that covers the light emitting element faces in a direction in which a traveling speed of the traveling unit is high. The image reading apparatus according to claim 1, wherein the supporting unit is made of a material having a higher thermal conductivity than the circuit board. The image reading apparatus according to claim 1, wherein the circuit board has a notch formed in a part of a mounting surface of the light emitting element. An image forming apparatus comprising: an image forming unit that forms an image on a recording medium; and the image reading apparatus according to claim 1.

Images