JP5315895B2 - Optical scanning apparatus and image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology for efficiently restraining rise in temperature inside a housing. <P>SOLUTION: An optical scanner includes: a rotary shaft 111 which rotates a rotary polyhedral mirror 22; a light-deflecting device 100 having bearing shafts 120a and 120b which support the rotary shaft 111; a housing 200 which accommodates the light-deflecting device 100 and on which exposure pores for exposing the bearing shafts 120a and 120b of the light-deflecting device 100 are formed; and a heat-radiating member 300 which is arranged between the housing 200 and a main frame 30, which supports the housing 200, and are held between the bearing shafts 120a, 120b and the main frame 30 so that the heat-radiating member may contact the main frame 30. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an optical scanning device and an image forming apparatus.

2. Description of the Related Art Conventionally, in an image forming apparatus using an electrophotographic method, an optical scanning device that performs scanning exposure with a laser beam on a photosensitive member has been used.
For example, Patent Document 1 describes the following technique. That is, using a rotating polygon mirror that rotates by driving the rotating shaft, the laser beam emitted from the laser unit is deflected and scanned, and scanning exposure with the laser beam is performed on the photosensitive member. In the optical scanning device described in Patent Document 1, an optical member such as silicon rubber having high thermal conductivity is sandwiched between the optical box body and the sheet metal, and the optical box body is fixed to the sheet metal. Have been described.

JP-A-6-75184

When the rotary polygon mirror provided in the housing of the optical scanning device rotates at a high speed, a large amount of heat is generated. When the temperature inside the housing of the optical scanning device becomes high, there is a risk of adversely affecting optical components and electronic components provided inside the housing.
An object of the present invention is to efficiently suppress an increase in temperature inside a casing due to heat generated as a rotating polygon mirror rotates at high speed.

The invention according to claim 1 includes an optical deflector having a rotating shaft for rotating the polygon mirror, and a rotating shaft bearing portion for supporting the rotating shaft, the optical deflector being housed, and the optical deflector of the optical deflector. The housing is disposed between a housing in which an exposure hole for exposing the rotary shaft bearing portion is formed, and the housing and a housing support member that supports the housing, and is in contact with the housing support member. A heat dissipating member sandwiched between the rotating shaft bearing portion and the housing support member , the heat dissipating member is provided with a fastening portion, and the heat dissipating member has the fastening portion as a vertex. The optical scanning device has a shape that is plastically deformed into a convex shape and elastically deforms when sandwiched between the rotary shaft bearing portion and the housing support member .
According to a second aspect of the present invention, the heat radiating member is provided with a fastening portion fixed to the optical deflector so as to face the rotating shaft bearing portion, and provided on the outer side of the fastening portion, and irregularities are alternately arranged. and a bent portion was, in claim 1, wherein the housing and a plurality of folding-back section of the bent portion comes into contact with the casing supporting member when being supported by the housing support member It is an optical scanning device of description.
According to a third aspect of the present invention, the fastening portion of the heat radiating member has a shape of a surface that is sandwiched between the rotating shaft bearing portion and the housing support member and faces the heat radiating member in the rotating shaft bearing portion. The optical scanning device according to claim 1 , wherein the optical scanning device is deformed so as to be along .

According to a fourth aspect of the present invention, the heat radiating member is arranged on the rotating shaft before being sandwiched between the rotating shaft bearing portion and the housing support member on the surface of the fastening portion on the rotating shaft bearing portion side. Projecting toward the bearing portion, and having a projecting portion that is sandwiched between the rotating shaft bearing portion and the housing support member and deforms along the shape of the surface of the rotating shaft bearing portion that faces the heat dissipation member. 4. The optical scanning device according to claim 1, wherein the optical scanning device is characterized in that:
According to a fifth aspect of the present invention, in the optical deflector, the heat radiating member is curved in a convex shape such that the fastening portion is a vertex before the housing is supported by the housing supporting member. 5. The structure according to claim 1, wherein when the casing is attached to the casing support member, the rotary shaft bearing portion and the casing support member are clamped. It is an optical scanning device of description.
According to a sixth aspect of the present invention, there is provided an optical deflector having an image holding member rotatably supported by the main body frame, a rotating shaft that rotates the polygon mirror, and a rotating shaft bearing portion that supports the rotating shaft, A housing that accommodates the optical deflector and has an exposure hole that exposes the rotating shaft bearing portion, and the rotating shaft that is disposed between the housing and the main body frame so as to be in contact with the main body frame An optical scanning device that includes a heat radiating member sandwiched between the bearing portion and the main body frame, and deflects and scans the light emitted from the light source to form an electrostatic latent image on the image carrier. The heat radiating member of the scanning device is provided with a fastening portion, and the heat radiating member has a shape that is plastically deformed into a convex shape such that the fastening portion is the apex, and includes the rotating shaft bearing portion and the main body frame. Elastic deformation when pinched An image forming apparatus, characterized by.

A seventh aspect of the present invention is the image forming apparatus according to the sixth aspect, further comprising a blowing unit that sends cooling air between the casing and the main body frame .
According to an eighth aspect of the present invention, the heat radiation member of the optical scanning device includes a fastening part fixed to the optical deflector so as to face the rotating shaft bearing part, and an unevenness provided on the outer side of the fastening part. And a plurality of folded portions of the bent portion are in contact with the main body frame when the casing is supported by the main body frame. The image forming apparatus according to 7.

According to a ninth aspect of the present invention, the fastening portion of the heat radiating member of the optical scanning device is sandwiched between the rotating shaft bearing portion and the main body frame and faces the heat radiating member in the rotating shaft bearing portion. The image forming apparatus according to claim 6 , wherein the image forming apparatus is deformed so as to conform to the shape of the image forming apparatus.
According to a tenth aspect of the present invention, the heat radiating member is disposed on the surface of the fastening portion on the rotating shaft bearing portion side before being sandwiched between the rotating shaft bearing portion and the main body frame. And a protrusion that is sandwiched between the rotary shaft bearing portion and the main body frame and deforms along the shape of the surface of the rotary shaft bearing portion that faces the heat radiating member.
The image forming apparatus according to claim 6 , wherein the image forming apparatus is an image forming apparatus.
According to an eleventh aspect of the present invention, the heat dissipating member of the optical scanning device is curved in a convex shape such that the fastening portion becomes a vertex before the housing is supported by the main body frame. 11. The fixing device according to claim 6, wherein the rotating shaft bearing portion and the main body frame are clamped when the housing is fixed to the optical deflector and the casing is attached to the main body frame. This is an image forming apparatus.

According to the first aspect of the present invention, the heat generated inside the housing can be radiated to the outside more efficiently than the configuration in which the heat radiating member is sandwiched between the housing and the housing support member. Moreover, the sealing performance of the housing can be improved.
According to the second aspect of the present invention, it is possible to efficiently dissipate the heat generated inside the housing to the outside with a simpler structure than in the case where the present invention is not adopted.
According to the third aspect of the present invention, the sealing performance of the housing can be improved as compared with the case where the present invention is not adopted .

According to claim 4 of the present invention, the sealing performance of the housing can be improved as compared with the case where the present invention is not adopted .
According to claim 5 of the present invention, the heat inside the housing can be dissipated to the outside with higher accuracy than when the present invention is not adopted .
According to the sixth aspect of the present invention, the heat generated inside the housing of the optical scanning device mounted on the image forming apparatus is more efficient than the configuration in which the heat radiating member is sandwiched between the housing and the main body frame. It can dissipate heat well outside. Moreover, the sealing performance of the housing can be improved.

According to the seventh aspect of the present invention, the heat inside the housing can be radiated more rapidly than in the case where the present invention is not adopted.
According to the eighth aspect of the present invention , it is possible to efficiently dissipate the heat generated inside the housing to the outside with a simpler structure than in the case where the present invention is not adopted.
According to the ninth aspect of the present invention, the sealing performance of the housing can be improved as compared with the case where the present invention is not adopted .
According to the tenth aspect of the present invention, the sealing performance of the housing can be improved as compared with the case where the present invention is not adopted .
According to the eleventh aspect of the present invention, the heat inside the housing can be dissipated to the outside with higher accuracy than when the present invention is not adopted.

The best mode (embodiment) for carrying out the present invention will be described below in detail with reference to the accompanying drawings.
<First Embodiment>
FIG. 1 is a diagram illustrating an overall configuration of an image forming apparatus 1 to which an optical scanning device 20 according to the first embodiment is applied.
The image forming apparatus 1 is a so-called tandem type digital color machine that forms a color image by a plurality of image forming units 10Y, 10M, 10C, and 10K (hereinafter also referred to as “image forming unit 10”) by electrophotography. is there. The image forming apparatus 1 includes an image forming unit 10 that forms an image of each color, an optical scanning device 20 that exposes the photosensitive drum 11 of each image forming unit 10 to form an electrostatic latent image, and the photosensitive drum 11. And an intermediate transfer belt 12 that superimposes and holds the toner image held thereon.

  The intermediate transfer belt 12 is looped around a drive roll 12A, a backup roll 12B, and idle rolls 12C and 12D. A primary transfer roll 13 is disposed at a position facing the photosensitive drum 11 of each image forming unit 10 with the intermediate transfer belt 12 interposed therebetween.

  The image forming apparatus 1 also includes a paper feed cassette 14 that stores recording paper (sheets) P, and a transport path 15 that transports the recording paper P upward from the paper feed cassette 14. Yes. In the middle of the conveyance path 15, a backup roll 12 </ b> B, a secondary transfer roll 16 disposed at a position facing the intermediate transfer belt 12, and a fixing device 17 are disposed. Further, on the upper surface of the image forming apparatus 1, a paper discharge stacking unit 18 on which the recording paper P on which the toner image is fixed by the fixing device 17 is discharged and stacked is disposed.

  Four sets of image forming units 10 are provided corresponding to the respective colors of yellow (Y), magenta (M), cyan (C), and black (K). Each image forming unit 10 includes a photosensitive drum 11. Are equipped with various devices for image formation. That is, the electrostatic latent image formed on the photosensitive drum 11 by the exposure by the charging device that charges the photosensitive drum 11 along the rotation direction of the photosensitive drum 11 and the light scanning device 20 is toner. A developing device that develops the image and a cleaner that removes residual toner remaining on the photosensitive drum 11 after the transfer of the toner image to the intermediate transfer belt 12 are disposed.

Next, the optical scanning device 20 will be described in detail.
The optical scanning device 20 scans the surface emitting laser array chip 21 having a plurality of light emitting points and the laser beams LY, LM, LC, and LK emitted from the surface emitting laser array chip 21 having a plurality of reflecting surfaces. And a rotating polygon mirror 22. The optical scanning device 20 also includes an optical system 23 that guides the laser beams LY, LM, LC, and LK scanned by the rotary polygon mirror 22 to the photosensitive drums 11 of the image forming units 10Y, 10M, 10C, and 10K, respectively. I have. Then, the photosensitive drums 11 of the image forming units 10Y, 10M, 10C, and 10K are exposed with the laser beams LY, LM, LC, and LK emitted from the surface emitting laser array chip 21 to form latent images.

FIG. 2 is a view showing the AA cross section in FIG. 1 of the optical scanning device 20.
The optical scanning device 20 includes an optical deflector 100 having a rotating polygon mirror 22, a housing 200 that houses the optical deflector 100 and is attached to the main body frame 30 of the image forming apparatus 1, and the optical deflector 100 and the main body frame 30. And a heat dissipation member 300 sandwiched between the two. The main body frame 30 is an example of a housing support member.

The optical deflector 100 includes a rotating body 110 that has a rotating polygon mirror 22 and rotates at high speed, and a sleeve 120 that is sealed at the lower end and supports the rotating shaft 111 of the rotating body 110.
The rotating body 110 includes a rotating body main body 113 to which a rotating polygon mirror 22, a rotating shaft 111, and a drive magnet 112 in which N poles and S poles are alternately magnetized in multiple poles are attached. The rotating polygon mirror 22, the rotating shaft 111, and the drive magnet 112 are attached to the rotating body main body 113 by, for example, press-fitting or bonding. The rotating polygon mirror 22 is fixed to the rotating body main body 113 by a leaf spring 114 and a washer 115.

The sleeve 120 includes a radial bearing portion 120 a that supports the radial direction of the rotating shaft 111 and a thrust bearing portion 120 b that supports the thrust direction of the rotating shaft 111. The gap between the rotary shaft 111 and the radial bearing portion 120a of the sleeve 120 is about several μm to several tens of μm, and this gap is filled with lubricating oil.
The thrust bearing portion 120 b is a pivot bearing formed of a lower end portion of the rotating shaft 111 and a sliding member (for example, a thermoplastic industrial resin agent) 121. The axial direction of the rotating body 110 is supported by the thrust bearing portion 120b. The sliding member 121 is sealed with a lid member 130 provided on the lower end side of the sliding member 121.

As shown in FIG. 2, an armature coil 122 that constitutes a motor with the drive magnet 112 is attached to the sleeve 120 at a position facing the drive magnet 112 in the radial direction. The armature coil 122 is attached to the sleeve 120 by, for example, press-fitting or bonding.
A printed circuit board 123 is attached to the sleeve 120 by caulking, for example. A magnet position detector 124 (for example, a Hall element) is mounted on the printed circuit board 123 at a position facing the armature coil 122 in the axial direction. The printed circuit board 123 is mounted with a driving IC 125 and a connector 126.

  The motor system in the present embodiment is a system called an outer rotor type in which a magnetic gap is provided in the radial direction and the drive magnet 112 is laid out on the outer diameter portion of the armature coil 122. The rotating body 110 refers to the signal output from the magnet position detector 124 by the magnetic field of the driving magnet 112 as a position signal, and rotates by switching the excitation of the armature coil 122 by the driving IC 125. The drive magnet 112 is magnetized in the radial direction, and rotates by generating rotational torque with the outer periphery of the armature coil 122. A harness (not shown) is connected to the connector 126 to supply power from the image forming apparatus 1 main body, to start / stop the motor, and to input / output control signals such as the number of rotations.

  And the optical deflector 100 comprised as mentioned above is accommodated in the housing | casing 200. FIG. However, the thrust bearing portion 120b of the sleeve 120 and the lower portion in the axial direction of the radial bearing portion 120a are fitted to the bearing portion support portion 201 formed in the housing 200, and the lower end surface of the thrust bearing portion 120b extends from the housing 200. Exposed outside. The heat radiating member 300 is fastened to the lid member 130 via the washer 150 by screw holes and bolts 140 formed in the lid member 130 provided in the thrust bearing portion 120b. The bearing portions 120a and 120b of the rotary shaft 111 of the optical deflector 100 are exposed to the outside of the housing 200 through holes for fitting the bearing portions 120a and 120b formed in the bearing portion support portion 201. For this reason, the bearing portion support portion 201 forms an exposure hole that exposes the bearing portions 120 a and 120 b of the rotating shaft 111.

  In addition, the outer diameter of the washer 150 is larger than the inner diameter of the bearing support portion 201 of the housing 200. Therefore, when the heat radiating member 300 is tightened from the outside of the housing 200 to the lid member 130 of the sleeve 120, the optical deflector 100 is pulled downward, and the lower surface of the printed circuit board 123 and the upper surface of the bearing support 201 are brought into contact with each other. The sealed state in the housing 200 is maintained.

  As shown in FIG. 2, the heat dissipating member 300 has a bellows-like bent portion 301 in which irregularities are alternately arranged. When the housing 200 is attached to the main body frame 30 as an example of a housing support member, the plurality of folded portions of the bent portion 301 come into contact with the main body frame 30. That is, the heat dissipating member 300 is in contact with the main body frame 30 at a plurality of folded portions of the bent portion 301 on the main body frame 30 side, and is in contact with the washer 150 on the optical deflector 100 side. And the washer 150 which contacts the heat radiating member 300 is in contact with the bearing part of the rotating shaft 111. Thereby, the heat generated due to the rotation of the rotating shaft 111 of the optical deflector 100 is directly transmitted to the washer 150 and the heat radiating member 300 and then transmitted to the main body frame 30. Therefore, the heat generated inside the housing 200 due to the rotation of the rotating shaft 111 can be efficiently radiated to the outside. Therefore, even if the calorific value increases due to the rotation of the rotary polygon mirror 22 at a high speed, an increase in temperature inside the housing 200 can be suppressed.

  In the configuration described in Patent Document 1 in which an elastic member is sandwiched between the optical box body and the sheet metal described in the background section, the elastic member is sandwiched so as to contact the optical box body and the sheet metal. Yes. On the other hand, the heat radiating member 300 according to the present embodiment is in contact with the washer 150, and the washer 150 is in contact with the bearing portion of the rotating shaft 111. Therefore, compared to the configuration described in Patent Document 1, heat generated due to the rotation of the rotating shaft 111 is more transferred to the main body frame 30 via the heat radiating member 300, so that heat can be radiated more quickly. The temperature rise inside the housing 200 can be more efficiently suppressed.

The heat radiating member 300 can be exemplified by a bent metal sheet or an aluminum material formed by a die casting method.
FIG. 3 is a diagram illustrating a state in which the heat dissipation member 300 is assembled to the sleeve 120 of the optical deflector 100 when the heat dissipation member 300 is a bent leaf spring material.
As shown in FIG. 3, the shape of the fastening portion 302 of the heat dissipating member 300 that faces the washer 150 at the time of assembly is a convex shape such that the bolt hole 303 through which the bolt 140 passes is a vertex. Further, a protruding portion 304 protruding from the upper surface of the fastening portion 302 is provided. By adopting such a shape, the fastening portion 302 functions as a leaf spring, the contact pressure between the printed circuit board 123 and the bearing support portion 201 is increased, and the sealing performance of the housing 200 is improved.
Note that a plurality of ribs 200a (see FIG. 2) are provided on the bottom surface of the housing 200 in order to make the housing 200 difficult to deform even when the heat dissipation member 300 is assembled in this way.

FIG. 4 is a diagram illustrating the optical scanning device 20 in a state where the heat dissipation member 300 is assembled.
Since the heat radiating member 300 is a member / shape that is easily elastically deformed, when the heat radiating member 300 is assembled to the sleeve 120 of the optical deflector 100, the bent portion 301 of the heat radiating member 300 is curved as shown in FIG. It is elastically deformed to the state. Then, by fastening the housing 200 to the main body frame 30 in this state, as shown in FIG. 2, the heat radiating member 300 has a rotating shaft so that a plurality of folded portions of the bent portion 301 are in contact with the main body frame 30. 111 is held between the bearing portions 120 a and 120 b and the main body frame 30.

  The image forming apparatus 1 to which the optical scanning device 20 according to the first embodiment is applied includes a cooling unit that cools the optical scanning device 20. That is, as shown in FIG. 1, a fan 40 that sends air between the housing 200 and the main body frame 30 of the optical scanning device 20 is provided. Note that the direction of the air blown by the fan 40 is preferably a direction that is substantially orthogonal to the cross-section of the bent portion 301 of the heat radiating member 300, that is, a direction that is substantially orthogonal to the paper surface in FIG.

In the optical scanning device 20 according to the first embodiment described above, the thrust bearing portion 120b of the sleeve 120 and the lower portion in the axial direction of the radial bearing portion 120a are fitted to the bearing portion support portion 201, and the heat radiating member 300 is provided. Is fastened to the lid member 130 of the sleeve 120 from the outside of the casing 200, thereby fixing the optical deflector 100 to the casing 200.
On the other hand, as a method of fixing the optical deflector 100 to the housing 200, it is conceivable to fasten the four corners of the printed circuit board 123 to the boss formed on the housing 200 with screws. However, with this method, in order to suppress the inclination of the rotation shaft 111 of the optical deflector 100 with respect to the fastening surface 200b to the main body frame 30 of the housing 200, the flatness of the printed circuit board 123 and the boss for fastening the printed circuit board 123 are used. The variation in the flatness, the dimensional variation in the fitting portion between the bearing portions 120a and 120b of the sleeve 120 and the bearing portion support portion 201 must be taken into consideration.
In the optical scanning device 20 according to the present embodiment, the light with respect to the fastening surface 200b (see FIG. 2) to the main body frame 30 of the housing 200 is fixed by fixing the optical deflector 100 to the housing 200 as described above. Suppression of the inclination of the rotating shaft 111 of the deflector 100 is more easily realized.

Further, the heat dissipating member 300 of the optical scanning device 20 according to the first embodiment described above is arranged in a direction substantially orthogonal to the cross section having the irregularities of the bent portion 301, that is, in a direction substantially orthogonal to the paper surface in FIG. (See FIG. 1).
Therefore, when the optical scanning device 20 is inserted into the image forming apparatus 1 from the side in a direction parallel to the paper surface of FIG. 1 and assembled to the main body frame 30, the heat radiation member 300 is inserted while contacting the main body frame 30. Even if it is done, the contact resistance between the heat dissipation member 300 and the main body frame 30 is small. Therefore, even if the heat radiating member 300 is provided in the lower part of the optical scanning device 20, the assembling property of the optical scanning device 20 into the image forming apparatus 1 is not adversely affected.

FIG. 5 is a view showing another embodiment of the sleeve 120 of the optical deflector 100.
The sleeve 160 shown in FIG. 5 is larger in diameter of the step portion to which the printed circuit board 123 is attached than the sleeve 120 shown in FIG. Then, when the light deflector 100 is fixed to the casing 200 by tightening the heat radiating member 300 to the lid member 130 of the sleeve 160 from the outside of the casing 200, the lower surface of the step portion of the sleeve 160 and the casing 200 are fixed. It is made for the upper surface of the bearing part support part 201 to contact. Then, machining is performed on the contact surface of the sleeve 160 with the bearing portion support portion 201 so that the surface degree becomes small.
By using such a sleeve 160, it is possible to stably hold the printed circuit board 123 and to prevent the rotation shaft 111 of the optical deflector 100 from being inclined with respect to the fastening surface 200b of the housing 200 to the main body frame 30. . In addition, the sealing performance of the housing 200 can be improved.

FIG. 6 is a diagram showing another embodiment of the heat radiating member.
The heat radiating member 400 shown in FIG. 6 has an area of the bent portion 401 larger than that of the bent portion 301 of the heat radiating member 300 shown in FIG. And when increasing the area | region of the bending part 401, it is set as the shape which follows the shape of the rib 200a provided in the bottom face of the housing | casing 200. FIG. By providing the heat dissipation member 400 having such a shape, the heat dissipation performance can be improved without impairing the rigidity of the housing 200.

<Second Embodiment>
FIG. 7 is a diagram illustrating an optical scanning device 500 according to the second embodiment. FIG. 7A is a diagram illustrating a state before assembly, and FIG. 7B is a diagram illustrating the state after assembly. FIG.
The optical scanning device 500 according to the second embodiment is characterized in that it has a holding member 600 that holds the optical deflector 100. The same functions as those of the optical scanning device 20 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted here.

  The holding member 600 of the optical scanning device 500 according to the second embodiment has a shape along the shape of the bottom surface side of the housing 200 of the optical deflector 100, that is, the shape of the sleeve 120 and the printed circuit board 123. In addition, screw holes (not shown) for fastening the printed circuit board 123 are formed in the holding member 600 at four corners. On the other hand, a hole (not shown) through which a screw is passed is formed in the printed circuit board 123 at a position corresponding to the screw hole of the holding member 600. Then, in a state where the optical deflector 100 is fixed to the holding member 600 with the screws 601, parts corresponding to the bearing portions 120 a and 120 b of the optical deflector 100 are fitted into the bearing portion support portion 201 of the housing 200. Then, the heat radiating member 300 is fastened to the screw hole formed on the lower end surface of the holding member 600 with the bolt 140.

  With such a configuration, for example, by finishing the holding member 600 by cutting, the dimensional accuracy in a state where the optical deflector 100 is assembled is improved and the sealing performance inside the housing 200 is improved. In addition, when the material of the holding member 600 is, for example, aluminum having good heat conduction, heat generated from the optical deflector 100 is efficiently released to the outside.

In addition, in embodiment mentioned above, although the shape of the heat radiating member 300,400 illustrated the bellows shape where the unevenness | corrugation was continued alternately, it is not limited to this shape in particular.
FIG. 8 is a diagram showing another embodiment of the heat radiating member. The shape of the heat radiating member may be a high and low wave shape like a wave, like the heat radiating member 700 of FIG. Further, like the heat radiating member 800 of FIG. 8B, the heat radiating member 800 and the main body frame 30 may be bent at an obtuse angle so as to be in contact with each other. Even with such a shape, the heat generated inside the housing 200 due to the rotation of the rotating shaft 111 can be efficiently radiated to the outside.

1 is a diagram illustrating an overall configuration of an image forming apparatus to which an optical scanning device according to a first embodiment is applied. It is a figure which shows the AA cross section in FIG. 1 of an optical scanning device. It is a figure which shows a mode that a thermal radiation member is assembled | attached to the sleeve of an optical deflector. It is a figure which shows the optical scanning device of the state which assembled | attached the heat radiating member. It is a figure which shows the other Example of the sleeve of an optical deflector. It is a figure which shows the other Example of a heat radiating member. It is a figure which shows the optical scanner which concerns on 2nd Embodiment, (a) is a figure which shows the state before an assembly | attachment, (b) is a figure which shows the state after an assembly | attachment. It is a figure which shows the other Example of a heat radiating member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Image forming apparatus, 10 ... Image forming part, 11 ... Photosensitive drum, 12 ... Intermediate transfer belt, 20,500 ... Optical scanning device, 22 ... Rotary polygon mirror, 30 ... Main body frame, 40 ... Fan, 100 ... Light Deflector, 110 ... Rotating body, 111 ... Rotating shaft, 112 ... Driving magnet, 113 ... Rotating body main body, 120, 160 ... Sleeve, 121 ... Sliding member, 122 ... Armature coil, 123 ... Printed circuit board, 130 ... Lid member 200 ... Case 300,400,700,800 ... Heat dissipation member 301,401 ... Bent part 600 ... Holding member

Claims (11)

An optical deflector having a rotating shaft for rotating the polygon mirror, and a rotating shaft bearing for supporting the rotating shaft;
A housing that houses the optical deflector and has an exposure hole that exposes the rotary shaft bearing portion of the optical deflector;
A heat dissipating member that is disposed between the casing and the casing support member that supports the casing, and is sandwiched between the rotary shaft bearing portion and the casing support member so as to contact the casing support member and,
Have
The heat dissipating member is provided with a fastening portion, and the heat dissipating member has a shape that is plastically deformed into a convex shape such that the fastening portion is the apex, and is sandwiched between the rotary shaft bearing portion and the housing support member. An optical scanning device which is elastically deformed when being applied . The heat radiating member includes a fastening portion secured to the optical deflector so as to face the rotary shaft bearing portion, and a bent portion which unevenness is provided on the outside of the fastening portion is continuous alternately, the The optical scanning device according to claim 1, wherein when the casing is supported by the casing support member, the plurality of folded portions of the bent portion are in contact with the casing support member. The fastening portion of the heat radiating member is sandwiched between the rotary shaft bearing portion and the housing support member and is deformed so as to follow the shape of the surface of the rotary shaft bearing portion facing the heat radiating member.
The optical scanning device according to claim 1, wherein: The heat radiating member protrudes toward the rotating shaft bearing portion before being sandwiched between the rotating shaft bearing portion and the housing support member on the surface of the fastening portion on the rotating shaft bearing portion side. The protruding portion that is sandwiched between the shaft bearing portion and the housing support member and deforms along the shape of the surface of the rotating shaft bearing portion that faces the heat radiating member. The optical scanning device according to any one of 1 to 3. The heat radiating member is fixed to the optical deflector in a state of being curved in a convex shape such that the fastening portion is a vertex before the housing is supported by the housing supporting member. the optical scanning device according to any one of 4 from claim 1, characterized in that it is held between the rotary shaft bearing portion and the housing support member when attached to the housing support member. An image carrier rotatably supported by the main body frame;
An optical deflector having a rotating shaft for rotating the polygon mirror, and a rotating shaft bearing portion for supporting the rotating shaft, and a housing formed with an exposure hole for accommodating the optical deflector and exposing the rotating shaft bearing portion. And a light radiating member disposed between the casing and the main body frame and sandwiched between the rotary shaft bearing portion and the main body frame so as to be in contact with the main body frame, and the light emitted from the light source An optical scanning device that deflects and scans to form an electrostatic latent image on the image carrier ,
Including
The heat radiating member of the optical scanning device is provided with a fastening portion, and the heat radiating member has a shape that is plastically deformed into a convex shape such that the fastening portion is the apex, and the rotary shaft bearing portion and the main body frame. An image forming apparatus that is elastically deformed when sandwiched between the two . The image forming apparatus according to claim 6 , further comprising a blowing unit that sends cooling air between the housing and the main body frame. Radiating member of the optical scanning device includes a fastening portion secured to the optical deflector so as to face the rotary shaft bearing portion, and a bent portion which unevenness is provided on the outside of the fastening portion, which are arranged in this alternating 8. The image forming apparatus according to claim 6 , wherein when the housing is supported by the main body frame, the plurality of folded portions of the bent portion are in contact with the main body frame. The fastening portion of the heat radiating member of the optical scanning device is sandwiched between the rotary shaft bearing portion and the main body frame and deformed so as to follow the shape of the surface of the rotary shaft bearing portion facing the heat radiating member. The image forming apparatus according to any one of claims 6 to 8, wherein: The heat radiating member protrudes toward the rotary shaft bearing portion before being sandwiched between the rotary shaft bearing portion and the main body frame on the surface of the fastening portion on the rotary shaft bearing portion side. And a projecting portion that is deformed so as to conform to the shape of the surface of the rotary shaft bearing portion that faces the heat radiating member.
The image forming apparatus according to claim 6 , wherein the image forming apparatus is an image forming apparatus. The heat radiating member of the optical scanning device is fixed to the optical deflector in a state of being curved in a convex shape such that the fastening portion is a vertex before the housing is supported by the body frame. 11. The image forming apparatus according to claim 6, wherein when the body is attached to the main body frame, the image forming apparatus is sandwiched between the rotary shaft bearing portion and the main body frame.

Images