JP2017058498A - Optical deflection apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical deflection apparatus in which a bearing can be cooled and tilt of a luminous flux reflection surface of a polygon mirror can be suppressed.SOLUTION: The optical deflection apparatus deflecting a luminous flux from a light source using a rotating optical deflection member is provided that comprises: a bearing part that supports a rotary shaft of the optical deflection member; a heat radiation member that is arranged so as to surround an outer perimeter of the bearing, and is fixed to an apparatus body; and a heat transfer member that contacts with the bearing part and the heat radiation member. A fixing position of the heat radiation member to the apparatus body is configured to be almost orthogonal to a first straight line connecting a center of the luminous flux on a light reflection surface of the optical deflection apparatus to a center of the rotary shaft, and be located on a second straight line passing through the center of the rotary shaft.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an optical deflection apparatus, and more particularly to an optical deflection apparatus that deflects a light beam from a light source with a rotating optical deflection member.

  In an electrophotographic image forming apparatus provided with a facsimile, a printer, a copying machine, and a combination of these functions, a photosensitive drum whose surface is uniformly charged by a charging device is irradiated with light from an exposure device to be exposed to light. An electrostatic latent image is formed on the surface of the body drum, and the electrostatic latent image is visualized with toner in the developing device, and then the developed toner image is transferred to a transfer member such as paper, and the transfer member is heated by the fixing device. The toner image is melted and fixed on the transfer member by applying pressure.

  The exposure apparatus includes a light source, a light deflection device that deflects and scans a light beam emitted from the light source, and an optical component that forms an image on the photosensitive drum by the light beam deflected and scanned by the light deflection device. The light deflecting device deflects a light beam from a light source by a rotating light deflecting member such as a polygon mirror.

  Currently, image forming apparatuses are required to increase the speed of image formation and increase the density of formed images. Measures to meet such demands include an increase in the number of light beams and a high-speed rotation of the polygon mirror. Of these, an increase in the number of light beams is accompanied by a significant cost increase.

  On the other hand, although the increase in cost of the polygon mirror can be suppressed by increasing the cost, the temperature of the polygon mirror rises due to the heat generated by the motor and the heat generated by the friction of the bearing that supports the rotating shaft of the polygon mirror. Therefore, it is necessary not only to cool the polygon mirror according to the atmosphere but also to actively cool the bearing.

  As a method for cooling the bearing, Patent Document 1 discloses a method in which a heat transfer member is provided in contact with the bearing and the cover member of the optical scanning device, and the heat of the bearing is released from the cover member via the heat transfer member. ing.

JP 2001-208997 A

  However, in the method disclosed in Patent Document 1, the heat transfer member is fixed to the cover member with screws so that the heat transfer member and the cover member are in close contact with each other. For this reason, when the heat transfer member expands or deforms due to a temperature rise, the position of the bearing may fluctuate and the axis of the polygon mirror may tilt. If the axis of the polygon mirror is tilted, the light beam reflecting surface of the polygon mirror is also tilted and the direction of the light beam is changed, so that the quality of the electrostatic latent image formed on the photosensitive drum is lowered, and consequently the image quality may be lowered. There is.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide an optical deflecting device capable of cooling the bearing of the optical deflecting device and suppressing the inclination of the light beam reflecting surface of the polygon mirror. And

  In order to achieve the above object, an optical deflection apparatus according to the present invention is an optical deflection apparatus that deflects a light beam from a light source with a rotating optical deflection member, and a bearing portion that supports a rotational axis of the optical deflection member; A heat dissipating member disposed so as to surround the outer periphery of the bearing part and fixed to the apparatus main body, and a heat transfer member that contacts the bearing part and the heat dissipating member, and fixing the heat dissipating member to the apparatus main body The position is substantially perpendicular to the first straight line connecting the center of the light beam on the light reflecting surface of the light deflecting member and the center of the rotation axis, and is positioned on the second line passing through the center of the rotation axis. Features.

  According to this configuration, even when the heat radiating member expands and deforms due to a temperature rise and the bearing portion is inclined, the amount of deformation of the heat radiating member on both sides sandwiching the second straight line is equalized. There is almost no inclination of the bearing part. Therefore, the inclination of the light flux reflecting surface and the change in the direction of the light flux accompanying this hardly occur, and the deterioration of the quality of the electrostatic latent image formed on the photosensitive drum is suppressed.

  In the above configuration, when a heat generation source is provided in addition to the light deflection member, it is preferable that the fixed position is located between the rotation axis center and the heat generation source. More preferably, the heat generation source is disposed on a second straight line and at a position farther from the fixed position than the rotation axis center.

  The said structure WHEREIN: It is preferable that the Young's modulus of the said heat transfer member is lower than the Young's modulus of the said heat radiating member.

  In the above configuration, the heat radiating member may be cylindrical.

  In the optical deflecting device of the present invention, the bearing can be cooled and the inclination of the light reflecting surface of the polygon mirror can be suppressed, so that a high-quality image can be formed when used in an image forming apparatus. Can do.

FIG. 1 is a view showing an example of an image forming apparatus provided with a light deflection apparatus according to the present invention. FIG. 2 is a schematic block diagram of the exposure apparatus. FIG. 3 is a cross-sectional view showing the configuration of the light deflection apparatus according to the present invention. FIG. 4 is a plan view of the light deflection apparatus of the present invention. 5 is a cross-sectional view taken along the line VV in FIG. FIG. 6 is a cross-sectional view corresponding to FIG. 5 of the optical deflecting device when the fixing hole of the heat sink is not on the second straight line. FIG. 7 is a plan view of another example of the optical deflection apparatus according to the present invention. 8 is a sectional view taken along line VIII-VIII in FIG.

  FIG. 1 is a diagram showing an example of an image forming apparatus provided with a light deflection apparatus according to the present invention. FIG. 1 shows a tandem color printer D as an image forming apparatus. The color printer D includes an endless intermediate transfer belt 33 having conductivity. The intermediate transfer belt 33 is hung on a pair of rollers 31 and 32 disposed on both the left and right sides in the drawing. The roller 32 is connected to a motor (not shown). When the motor is driven, the roller 32 rotates counterclockwise, whereby the intermediate transfer belt 33 and the roller 31 in contact with the roller 32 are driven to rotate. A secondary transfer roller 34 is in pressure contact with the outside of the belt portion supported by the roller 32. The toner image formed on the intermediate transfer belt 33 at the nip portion (secondary transfer region) between the secondary transfer roller 34 and the intermediate transfer belt 33 is transferred onto the conveyed paper P.

  A cleaning member 35 for cleaning the surface of the intermediate transfer belt 33 is provided outside the belt portion supported by the roller 31. The cleaning member 35 is in pressure contact with the roller 31 via the intermediate transfer belt 33 and collects untransferred toner at the contact portion.

  Below the intermediate transfer belt 33 suspended between the rollers 31 and 32, yellow (Y), magenta (M), cyan (C), black ( K) four image forming units 2Y, 2M, 2C, and 2K (hereinafter may be collectively referred to as “image forming unit 2”). In these image forming units 2, a toner image of a corresponding color is created using each color developer.

  The image forming unit 2 includes a cylindrical photosensitive drum 20 as an electrostatic latent image carrier. Around the photosensitive drum 20, a charger 21, a developing device 23, a primary transfer roller 24, and a photosensitive drum cleaning member 25 are arranged in this order along the rotation direction (clockwise direction). The primary transfer roller 24 is in pressure contact with the photosensitive drum 20 with the intermediate transfer belt 33 interposed therebetween to form a nip portion (primary transfer region). An exposure device 6 is disposed below the image forming unit 2. The exposure device 6 corresponds to one of the four image forming units 2 and emits a light beam modulated according to the image gradation data of each color according to the gradation data. The structure of the exposure apparatus 6 will be described in detail later.

  Above the intermediate transfer belt 33, hoppers 4Y, 4M, 4C, and 4K that contain toner to be supplied to the developing devices 23 of the respective colors are arranged. A paper feed cassette 50 is detachably disposed as a paper feed device below the exposure device 6. The sheets P stacked and accommodated in the sheet cassette 50 are sent out one by one to the transport path sequentially from the top by the rotation of the sheet feed roller 51 disposed in the vicinity of the sheet cassette 50. The paper P sent out from the paper feed cassette 50 is conveyed to the registration roller pair 52 and is sent out to the secondary transfer area at a predetermined timing.

  In the color printer D having such a configuration, image formation is performed as follows. First, in each image forming unit 2, the outer peripheral surface of the photosensitive drum 20 that is rotationally driven at a predetermined peripheral speed is charged by the charger 21. Next, light corresponding to the image information is projected from the exposure device 6 on the surface of the charged photosensitive drum 20 to form an electrostatic latent image. Subsequently, the electrostatic latent image is made visible by toner as a developer supplied from the developing device 23. When the toner image of each color formed on the surface of the photosensitive drum 20 in this way reaches the primary transfer region by the rotation of the photosensitive drum 20, the toner image from the photosensitive drum 20 in the order of yellow, magenta, cyan, and black. Transfer (primary transfer) is performed on the intermediate transfer belt 33 and overlapped.

  Untransferred toner remaining on the photosensitive drum 20 without being transferred to the intermediate transfer belt 33 is scraped off by the photosensitive drum cleaning member 25 and removed from the outer peripheral surface of the photosensitive drum 20.

  The superimposed four color toner images are conveyed to the secondary transfer region by the intermediate transfer belt 33. On the other hand, the sheet P is conveyed from the registration roller pair 52 to the secondary transfer area in accordance with the timing. Then, the four color toner images are transferred (secondary transfer) from the intermediate transfer belt 33 to the paper P in the secondary transfer region. The sheet P on which the four color toner images are transferred is conveyed to the fixing device 1.

  In the fixing device 1, the paper P passes through a nip portion between the pressure roller 12 and a fixing roller 11 incorporating a rod-shaped halogen heater 13. During this time, the paper P is heated and pressurized, and the toner image on the paper P is melted and fixed on the paper P. The paper P on which the toner image is fixed is discharged to the paper discharge tray 54 by the discharge roller pair 53.

  On the other hand, the intermediate transfer belt 33 that has passed through the secondary transfer region is cleaned by the cleaning member 35. Thereafter, the rotational drive of each photosensitive drum 20 and the intermediate transfer belt 33 is stopped.

  FIG. 2 shows a schematic block diagram of the exposure apparatus 6. The exposure apparatus 6 includes a housing 60, light sources 61Y, 61M, 61C, and 61K (hereinafter may be collectively referred to as “light source 61”), a collimator lens 62, and a reflection lens disposed in the housing 60. Members 63Y, 63M, 63C, and 63K (hereinafter sometimes collectively referred to as “reflecting member 63”), adjustment mirror 64, light deflecting device 7, scanning lens 65, and separating reflecting members 66Y, 66M, and 66C. 66K (hereinafter, sometimes collectively referred to as “separation reflection member 66”. The separation reflection member 66K is illustrated in FIG. 1 but is not illustrated in FIG. 2 because the height of the separation reflection member 66K is different.) It has.

  Each light source 61 is a light source that emits a light beam for exposing each of the photosensitive drums 20 of each image forming unit 2, and is, for example, a laser diode that emits a laser beam as a light beam. The collimator lens 62 is disposed on the light emission surface side of each light source 61 and converts the light beam L emitted from each light source 61 from diffused light to parallel light.

  The light beam L emitted from each light source 61 is reflected by each reflecting member 63 and is applied to the adjustment mirror 64. In FIG. 2, the light beams L emitted from the light sources 61 are shown to overlap each other. However, since the light sources 61 have different installation heights in the direction perpendicular to the paper surface in FIG. (See FIG. 1). The adjusting mirror 64 reflects each light beam reflected by each reflecting member 63 toward the light deflecting device 7.

  The light deflection device 7 is a circuit board 71, a motor 72 attached to the circuit board 71, a polygon mirror (light deflection) which is attached to a rotation shaft of the motor 72 and has a plurality of light reflecting surfaces arranged side by side in the circumferential direction. Member) 73. The structure of the optical deflection device 7 will be described later.

  The light beam L reflected by the adjustment mirror 64 is incident on the light reflecting surface at a constant angle with respect to the central axis of the polygon mirror 73. By rotating the polygon mirror 73, the incident angle and reflection angle of the light beam L incident on the light reflecting surface of the polygon mirror 73 change. That is, the reflected light beam is scanned by causing the light beam L to enter the rotating polygon mirror 73 from the side surface.

  The scanning lens 65 is disposed in the housing 60 so that the light beam L scanned by the polygon mirror 73 is transmitted. The light beam L that has passed through the scanning lens 65 is incident on the separating and reflecting member 66 that reflects the light beam toward the photosensitive drum 20 of each image forming unit 2. The light beam L is incident on the separation / reflection member 66 at a point (spot), and the spot moves in the longitudinal direction of the separation / reflection member 66 by scanning the light beam L.

  The scanning lens 65 adjusts the transmitted light beam so that the moving speed of the spot of the light beam L on the separation reflection member 66 is a constant speed in the linear direction. The light beam L reflected by the separation reflection member 66 is further reflected by the reflection member 67 (see FIG. 1) as necessary, and scans and exposes the photosensitive drum 20.

  Next, details of the configuration of the optical deflector according to the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 3 is a cross-sectional view showing the configuration of the light deflection apparatus 7 according to the present invention. A motor 72 is attached to the circuit board 71 so that the axial direction is perpendicular to the circuit board 71, and the bearing portion 721 of the motor 72 projects outward from the back surface of the circuit board 71. A polygon mirror 73 is attached to the rotation shaft 722 of the motor 72, and the polygon mirror 73 is attached so that its central axis coincides with the rotation shaft 722 of the motor 72. Since the rotation axis of the motor 72 is the rotation axis of the polygon mirror 73, the bearing portion 721 supports the rotation axis of the polygon mirror 73.

  The housing 70 of the optical deflection device 7 is formed with a through hole 70 a into which the bearing portion 721 of the motor 72 can enter and a screw hole 70 b for fixing the circuit board 71 with a screw member 77. On the surface opposite to the surface where the screw hole 70b of the housing 70 is formed, a heat radiating plate 76 is disposed so as to block the through hole 70a. The heat radiating plate 76 is made of a metal such as iron, for example, and constitutes the main body of the light deflecting device 7 together with the housing 70. A part of the casing 60 of the exposure apparatus 6 shown in FIG. 2 may be used as the casing 70 of the light deflection apparatus 7.

  A cylindrical heat radiating member 74 is disposed inside the through hole 70 a so as to surround the bearing portion 721. Between the outer peripheral surface of the bearing portion 721 and the inner peripheral surface of the heat radiating member 74, the bearing portion 721 and the heat radiating member are disposed. The heat transfer member 75 is filled so as to be in close contact with both the member 74. A fixing hole 76 a for positioning the heat radiating member 74 is formed in a portion exposed to the through hole 70 a of the heat radiating plate 76. A protrusion 74a provided at the bottom of the heat dissipation member 74 is inserted into the fixing hole 76a, and the heat dissipation member 74 is fixed. That is, the fixing hole 76 a is a fixing position of the heat radiating member 74 to the main body of the light deflection apparatus 7. When the temperature of the bearing portion 721 rises with the operation of the optical deflecting device 7, the heat of the bearing portion 721 is transferred to and released from the heat radiating member 74 and the heat radiating plate 76 via the heat transfer member 75. To be cooled. The heat radiating member 74 is made of, for example, a metal such as aluminum, and the heat transfer member 75 is made of, for example, thermally conductive silicone. The heat radiating member 74 has a bottomless cylindrical shape in FIG. 3, but may have a bottom on the heat radiating plate 76 side. In this case, the heat transfer member 75 can also be filled between the bottom surface of the bearing portion 721 and the bottom surface of the heat dissipation member 74, and cooling of the bearing portion 721 can be promoted.

  FIG. 4 is a plan view of the light deflection apparatus of the present invention. In the figure, a straight line connecting the center position 73a of the light beam L on the light reflecting surface of the polygon mirror 73 and the rotation axis center 73b of the polygon mirror 73 is defined as a first straight line S1. A straight line that passes through the rotation axis center 73b of the polygon mirror 73 and is substantially orthogonal to the first straight line S1 is defined as a second straight line S2. In the light deflecting device 7 of the present invention, the fixing hole 76a of the heat radiating plate 76 shown in FIG. 3 is provided on the second straight line S2 in plan view. The central position 73a of the light beam L on the light reflecting surface of the polygon mirror 73 slightly varies with the rotation of the polygon mirror 73, and the positions of the first straight line S1 and the second straight line S2 also vary accordingly. However, the position of the fixing hole 76a may be within the range of this variation.

  The reason why the fixing hole 76a of the heat radiating plate 76 is provided on the second straight line S2 will be described. FIG. 5 is a cross-sectional view taken along the line V-V in FIG. 4, that is, a cross-sectional view including the first straight line S <b> 1 of the peripheral portion of the heat radiating member 74 of the optical deflection apparatus of the present invention. When the temperature of the bearing portion 721 rises, the heat radiating member 74 expands and deforms as indicated by the alternate long and short dash line due to the heat. When the heat dissipating member 74 expands, the heat transfer member 75 that is in close contact with the heat dissipating member 74 also extends in the left-right direction in the drawing. Since the heat transfer member 75 is also in close contact with the bearing portion 721, the bearing portion 721 receives a force from the extended heat transfer member 75.

  In the cross section shown in FIG. 5, the magnitudes Fa and Fb of the force received by the bearing portion 721 from the heat transfer member 75 are E and Young's modulus of the heat transfer member 75, respectively. Assuming Δa and Δb, they are expressed as Fa = p × E × Δa and Fb = p × E × Δb, respectively, using a predetermined constant p.

  Since the expansion amounts Δa and Δb of the heat transfer member 75 are the same as the expansion amount in the horizontal direction of the inner peripheral surface of the heat dissipation member 74 in the drawing, the linear expansion coefficient of the heat dissipation member 74 is α, If the temperature change amount is ΔT, and the distances from the fixing hole 76a to the contact portions pa and pb where the heat dissipation member 74 and the heat transfer member 75 are in contact on the cross section including the first straight line S1, D1a and D1b (see FIG. 4) Δa = q × α × ΔT × D1a and Δb = q × α × ΔT × D1b, respectively, using a predetermined constant q.

  In the optical deflecting device according to the present invention, the fixing hole 76a is disposed on the second straight line S2 that passes through the rotational axis center 73b of the polygon mirror 73 and is substantially perpendicular to the first straight line S1, and D1a and D1b are substantially the same. It will be the same length. Therefore, if the temperature change amount ΔT is uniform throughout the heat dissipation member 74, Fa and Fb have substantially the same value even if the temperature rises, and the bearing portion 721 hardly tilts in the first straight line S1 direction. Therefore, since the inclination of the light beam reflecting surface of the polygon mirror 73 and the change in the direction of the light beam hardly occur, a high-quality image can be stably formed even when the temperature rises.

  FIG. 6 is a cross-sectional view corresponding to FIG. 5 of the light deflector 7 when the fixing hole 76a of the heat radiating plate 76 is not on the second straight line S2. When the fixing hole 76a is not on the second straight line S2, the sizes of Fa and Fb are different, and the position of the bearing portion 721 is shifted. This figure shows a case where Fb is larger than Fa. At this time, since the position of the bearing portion 721 does not fluctuate in the portion in contact with the circuit board 71, the bearing portion 721 is inclined in the direction of the first straight line S1, the light flux reflecting surface of the polygon mirror 73 is also inclined, and the direction of the light flux is changed. The quality of the electrostatic latent image formed on the body drum is lowered, and the quality of the image is lowered.

  The Young's modulus of the heat transfer member 75 is preferably lower than the Young's modulus of the heat dissipation member 74. In this case, even if the heat radiating member 74 is deformed, the heat transfer member 75 can be in close contact with the bearing portion 721, so that the heat radiating efficiency can be improved. Further, the force received by the bearing portion 721 from the heat transfer member 75 can be reduced, and a high-quality image can be formed more stably.

(Second Embodiment)
Another example of the light deflection apparatus according to the present invention will be described with reference to the drawings. FIG. 7 is a plan view of another example of the light deflection apparatus according to the present invention. As shown in the figure, the optical deflection apparatus 7 of the second embodiment has the same configuration as the optical deflection apparatus 7 of the first embodiment except that an integrated circuit 78 is provided on a circuit board 71. Yes. Therefore, in 2nd Embodiment, the same code | symbol is attached | subjected to the same member and part as 1st Embodiment.

  Since the integrated circuit 78 provided on the circuit board 71 generates heat during operation, it becomes a heat generation source other than the polygon mirror 73 in the optical deflector 7. In the present embodiment, the integrated circuit 78 serving as such a heat generation source is disposed on the second straight line S2 in plan view. As a result, the distances D2a and D2b from the integrated circuit 78 to the contact portions pa and pb where the heat dissipation member 74 and the heat transfer member 75 are in contact are substantially the same on both sides of the first straight line S1 across the bearing portion 721. Therefore, the amount of temperature change caused by the heat generation of the integrated circuit 78 at these contact portions pa and pb is substantially the same. Therefore, for the same reason as in the first embodiment, the inclination of the bearing portion 721 in the direction of the first straight line S1 hardly occurs in the second embodiment.

  In the second embodiment, as shown in FIG. 7, the fixing hole 76 a that is the fixing position of the heat radiating member 74 is formed so as to be positioned between the rotation axis center 73 b of the polygon mirror 73 and the integrated circuit 78. preferable. In the case where the fixing hole 76a is formed at such a position, at the two contact portions pc and pd where the heat radiating member 74 and the heat transfer member 75 are in contact with each other on the second straight line S2, the normal temperature due to the heat generation of the integrated circuit 78 is started. The temperature change amount ΔTc of the contact portion pc close to the integrated circuit 78 is larger than the temperature change amount ΔTd of the contact portion pd far from the integrated circuit 78. That is, ΔTc> ΔTd. On the other hand, the distance D2c from the fixed hole 76a to the contact part pc is shorter than the distance D2d from the fixed hole 76a to the contact part pd. That is, D2c <D2d.

  FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. Here, the force received by the bearing portion 721 from the heat transfer member 75 at the contact portions pc and pd is the same as described for the magnitudes Fa and Fb of the force received by the bearing portion 721 from the heat transfer member 75 in the first embodiment. , Fc and Fd are proportional to the elongation amounts Δc and Δd of the heat transfer member 75 in each portion, and the elongation amounts Δc and Δd are proportional to the temperature variations ΔTc and ΔTd and the distances D2c and D2d, respectively.

  By arranging the integrated circuit 78 at a position farther from the rotation axis center 73b of the polygon mirror 73 than the fixed hole 76a, ΔTc> ΔTd and D2c <D2d are satisfied, and Fc is greatly influenced by the temperature change amount ΔTc. While the influence of the distance D2c is small, Fd has a small influence of the temperature change ΔTd, and the influence of the distance D2d is large. Therefore, the influence of the temperature change amount and the influence of the distance from the protrusions cancel each other at the contact portions pc and pd, and the increase in the difference between the elongation amounts Δc and Δd can be suppressed, and the increase in the difference between Fc and Fd is also suppressed. it can. Therefore, the inclination of the bearing portion 721 in the second straight line S2 direction can also be suppressed, and a high-quality image can be formed more stably.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this content. The embodiments of the present invention can be variously modified without departing from the spirit of the invention.

  The light deflecting device of the present invention can cool the bearing and suppress the inclination of the light beam reflecting surface of the polygon mirror, so that it can form a high-quality image when used in an image forming apparatus. Can be useful.

7 Optical deflecting device 70 Housing 70a Through hole 70b Screw hole 71 Circuit board 72 Motor 721 Bearing portion 722 Rotating shaft 73 Polygon mirror (light deflecting member)
73a Center position 73b of light beam on the light reflection surface 74b Rotating shaft center 74 Heat radiation member 74a Projection 75 Heat transfer member 76 Heat radiation plate 76a Fixing hole 77 Screw member 78 Integrated circuit (heat generation source)
L luminous flux

Claims (5)

An optical deflecting device that deflects a light beam from a light source with a rotating optical deflecting member,
A bearing portion for supporting a rotation shaft of the light deflection member;
A heat dissipating member disposed so as to surround the outer periphery of the bearing portion, and fixed to the apparatus main body;
A heat transfer member that contacts the bearing and the heat dissipation member;
With
The fixing position of the heat radiating member to the apparatus main body is substantially orthogonal to the first straight line connecting the center of the light beam on the light reflecting surface of the light deflecting member and the center of the rotation axis, and passes through the center of the rotation axis. An optical deflecting device located on the second straight line. In addition to the light deflection member, it has a heat generation source,
The light deflection apparatus according to claim 1, wherein the heat generation source is arranged on a second straight line.   The light deflection apparatus according to claim 2, wherein the fixed position is located between the rotation axis center and the heat generation source.   The light deflection apparatus according to claim 1, wherein a Young's modulus of the heat transfer member is lower than a Young's modulus of the heat dissipation member.   The light deflection apparatus according to claim 1, wherein the heat radiating member is cylindrical.

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