JP3371658B2 - Rotating polygon mirror mounting structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary polygon mirror mounting structure, and more particularly to a polygonal prism rotary polygon mirror having a reflecting surface for deflecting a light beam formed on a side surface thereof as a rotary shaft of a motor. The present invention relates to a rotary polygon mirror mounting structure for mounting on a rotating plate that rotates integrally.

[0002]

2. Description of the Related Art In recent years, laser printers and laser copying machines are provided with an optical scanning device for scanning a light beam on a photosensitive material or a photosensitive member. The optical scanning device deflects the light beam in a predetermined direction. A rotating polygon mirror is installed. Metal or resin such as aluminum or aluminum alloy is generally used for the material of the rotary polygon mirror. For example, when metal such as aluminum or aluminum alloy is used, the rotary polygon mirror is highly accurately cut into a polygonal column shape. The reflective surface is formed by a method such as vacuum deposition by using aluminum oxide as a protective layer and copper as a reflective layer on each side surface. On the other hand, when a resin is used as the material, it is formed into a polygonal column with high precision, and each side surface thereof is subjected to metal vapor deposition or plating to form a reflecting surface.

FIG. 7 shows a configuration example in which the rotary polygon mirror formed as described above is attached to a predetermined motor. As shown in FIG. 7, the rotary polygon mirror 102 is fixed to the rotating portion (the rotor 104 and the rotating plate 106) of the motor 100 and is rotated around the central axis X by the driving force of the motor 100.

In such a case, as a fixing method for fixing the rotary polygon mirror 102 to the rotary plate 106 in the direction of the central axis X, for example, as shown in Japanese Patent Laid-Open No. 6-51226, a spring washer near the center of rotation is used. Or fixing with a speed nut or cutting the screw on the rotary shaft to fix the center with a nut, or as shown in Japanese Utility Model Laid-Open No. 5-25418, screws are provided at equal intervals on concentric circles on the upper surface of the rotary polygon mirror. Method of fixing (other, actual Kaihei 1-9
Japanese Unexamined Patent Publication No. 0022 and Japanese Unexamined Patent Publication No. 3-194513) have been used.

[0005]

However, in any of the conventional methods for fixing the rotary polygon mirror in the central axis direction as described above, the rotary polygon mirror is fixed directly on the upper surface of the rotary polygon mirror. As shown in FIG. 8A, the fixed position 112 of the rotary polygon mirror 110 and the rotary polygon mirror 110 are fixed to the rotary plate 1.
14 is different from the position 116 held in the central axis direction, the rotary polygon mirror 110 is distorted as shown by the dotted line, and the traveling direction of the light beam T reflected by the reflecting surface 110A is displaced as shown by the dotted line. There was fear.

Further, as shown in FIG. 8B, even when the fixed position 112 of the rotary polygon mirror 110 and the position 116 of holding the rotary polygon mirror 110 by the rotary plate 114 in the central axis direction coincide with each other in the radial direction. , The rotary polygon mirror 110 is distorted as shown by the dotted line depending on how the screws 118 are tightened, and
The traveling direction of the light beam T reflected by 10A is displaced as shown by the dotted line, or as shown in FIG.
There is a possibility that unevenness may occur in A and the flatness may deteriorate.

By the way, in order to prevent the reflection surface from being distorted, the rotary polygon mirror is made thick to increase the rigidity,
Although it is possible to deal with such things as molding with extremely hard metal, as described above, the rotary polygon mirror needs to be molded into a polygonal column with high accuracy, and if the above-mentioned measures are taken,
The above countermeasures were actually difficult because the load and labor of the molding work increase.

The present invention has been made to solve the above-mentioned problems, and it is possible to prevent distortion of the reflecting surface of a light beam when the rotary polygon mirror is attached to a motor. It is intended to provide a mounting structure for.

[0009]

The invention according to claim 1 is
A rotary polygon mirror mounting structure for mounting a polygonal polygonal rotary polygon mirror having a reflecting surface for deflecting a light beam formed on a side surface thereof to a rotary plate that rotates integrally with a rotation shaft of a motor,
The rotary polygon mirror is fixed or integrally formed with the rotary polygon mirror, and the dimension in the radial direction of the rotation axis is larger than that of the rotary polygon mirror.
Yes and large stationary member, and an outer fastening means for fastening to the rotating plate on the outside than the large fixed member and the reflecting surface have
Then, the large-sized fixing member is fastened to the rotary plate.
Absorbs deformation between the position and the position of the reflecting surface of the rotating polygon mirror
It has a deformation | transformation absorption site | part for doing. It is characterized by the above-mentioned.

According to a second aspect of the present invention, a rotary polygonal mirror having a polygonal prism having a reflecting surface for deflecting a light beam formed on its side surface is attached to a rotary plate that rotates integrally with a rotary shaft of a motor. a mounting structure of a polygon mirror, a fixed portion to which the rotary polygonal mirror is integrally molded with secured to or rotating polygon mirror
The material and the fixing member on the rotation axis side of the reflecting surface.
And an inner fastening means that fastens the rotary plate from the rotary plate side .

[0011]

[0012]

[0013] above the mounting structure according to claim 1, wherein the rotating polygon mirror is molded integrally with the secured to or rotating polygon mirror, rotating multi
A large-sized fixing member having a larger dimension in the radial direction of the rotation axis than the surface mirror is provided, and this large-sized fixing member is fastened to the rotary plate outside the reflecting surface by the outer fastening means.

As described above, since the rotary polygon mirror is not directly fastened to the rotary plate but indirectly fastened to the rotary plate by using a large-sized fixing member, the distortion caused by the conventional fixing is fixed to the rotary polygonal face. It can be prevented from occurring on the reflecting surface of the mirror.

[0015]

However, in this case, when the distortion caused by fixing is large and the reflecting surface of the rotary polygon mirror is close to the fastening position,
It is difficult to completely remove the distortion generated on the reflecting surface . Therefore, in the large-sized fixing member, by providing the deformation absorbing portion between the fastening position and the position of the reflecting surface of the rotary polygon mirror, the strain due to the fastening is absorbed by the deformation absorbing portion.
As a result, it is possible to prevent the distortion from reaching the reflection surface and to enhance the effect of preventing the distortion of the reflection surface.

The deformation absorbing portion corresponds to, for example, a groove 12D formed on a concentric circle around the rotation axis W shown in FIGS. 4 (A) and 4 (B).

The mounting structure according to claim 2 is characterized in that
A fixed part to which a face mirror is fixed or integrally formed with a rotary polygon mirror
Material is provided, and this fixing member is
It is fastened to the rotating plate. In this way the rotating polygon mirror rotates
It is not directly fastened to the plate, but it is fixed to the rotary plate using the fixing member.
Since it is indirectly fastened, it is accompanied by conventional fixing
Preventing distortion from occurring on the reflective surface of the rotating polygon mirror
You can Then, as a mounting structure for indirectly fastening the rotary polygon mirror on the rotating plate, it is a mounting structure for fastening the fixed member from the rotating plate side rotating plate in rotation axis side of the reflecting surface (inside) by the inner fastening means ing.

An example of this mounting structure is shown in FIGS.
As shown in FIGS. 10 and 11, by fastening the fixed member 12B to the rotary plate 50 from the rotary plate 50 side, the fixed member 12B is not on the outside of the reflecting surface but on the rotary shaft side as in the invention according to claim 1. Even if they are fastened, it is possible to realize a mounting structure that indirectly fastens the rotary polygon mirror to the rotary plate. Also in the mounting structure of the second aspect, since the rotary polygon mirror is indirectly fastened to the rotary plate, that distortion associated with prior such fixing is prevented from occurring in the reflecting surface of the rotary polygon mirror it can.

Further, in the mounting structure according to the second aspect of the present invention, the size of the fixing member viewed in the radial direction of the rotating shaft does not necessarily have to be larger than the size of the rotary polygon mirror, so that the fixing member is within a range allowable in terms of rigidity. There is an advantage that the size can be reduced.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 shows an optical scanning device 1 to which the present invention is applied.
0 is shown, and FIG. 1 is a schematic diagram showing the configuration of the image recording device 11 incorporating the optical scanning device 10.

First, the schematic structure of the image recording apparatus 11 will be described with reference to FIG. The image recording device 11 is provided with an optical scanning device 10 including a rotary polygon mirror 12 to be described later and a cylindrical photoconductor 24. The photoconductor 24 is rotating in the direction of arrow F, and in the vicinity of the side surface of the photoconductor 24, a charger 14 that charges the surface of the photoconductor 24 along the rotation direction, and toner on the surface of the photoconductor 24. A developing device 16 for adhering the toner, a transfer charging device 20 for transferring the toner from the surface of the photoconductor 24 to the paper 18, and a cleaner 26 for removing the toner from the surface of the photoconductor 24 are sequentially installed.

The photoconductor 24 charged by the charger 14.
Has a characteristic that, when it receives light, the potential of its light receiving portion decreases. In the image recording device 11, utilizing this characteristic, the surface of the photoconductor 24 charged by the charger 14 and rotating in the direction of arrow F is irradiated with light from the optical scanning device 10 shown by arrow J, and The potential of the light receiving part is lowered.

Further, the toner is adhered by the developing device 16 only to the above-mentioned light receiving portion of the surface of the photoconductor 24, that is, the portion where the potential is lowered. The toner attached only to the light receiving portion on the surface of the photoconductor 24 is transferred from the surface of the photoconductor 24 to the paper 18 by the transfer charger 20. The sheet of paper 18 transferred here is conveyed in the direction of arrow G, and the toner on the sheet of paper 18 is fused and fixed by the fixing device 22 installed on the downstream side in the conveying direction.

Next, the schematic configuration of the optical scanning device 10 will be described with reference to FIG. A laser diode 30 as a light source is installed in the optical scanning device 10, and a collimator lens for converting the light beam from the laser diode 30 from a diffused light beam to a parallel light beam in the vicinity of the emission side of the laser diode 30. 32 are arranged.

The light beam, which has been converted into parallel rays by the collimator lens 32, is focused via the cylindrical lens 34 on the reflecting surface 12C provided on the side surface of the light reflecting portion 12A of the rotary polygon mirror 12. . The cylindrical lens 34 has a role of correcting the surface tilt of each reflecting surface 12C.

The light reflecting portion 12A of the rotary polygon mirror 12 has eight reflecting surfaces 12C and rotates at high speed in the direction of arrow P about the shaft 42 by the driving force from a motor which will be described later.
It has a role of continuously changing and deflecting the incident angle of the light beam on each reflecting surface 12C. That is, the rotary polygon mirror 12
Causes the light beam to be deflected and scanned along the main scanning direction indicated by arrow K.

In the traveling direction of the light beam deflected by the rotary polygon mirror 12, f for moving the image forming point of the light beam on the photosensitive member 24 in the main scanning direction indicated by the arrow K at a constant speed.
A θ lens 28 is arranged. The light beam that has passed through the fθ lens 28 forms an image on the surface of the photoconductor 24 via the cylindrical lens 36.

On the other hand, the cylindrical photosensitive member 24 rotates about the axis V in the direction of arrow Q. That is, the side surface 24A of the photoconductor 24 is scrolled from the top to the bottom (in the sub-scanning direction) in FIG.

Therefore, by the movement of the image forming point on the photoconductor 24 along the main scanning direction by the action of the fθ lens 28 and the scrolling of the photoconductor 24 in the sub-scanning direction, the photoconductor 24 is moved. The side surface 24A is scanned by the light beam.

The mirror 38 is provided at the end of the light beam in the main scanning direction that does not affect the exposure of the image on the photoconductor 24.
And a synchronization sensor 40 for detecting the main scanning start timing is arranged in the direction of reflection of the light beam by the mirror 38.

Now, the rotary polygon mirror 12 according to the present invention will be described.
The configuration of the motor that drives the rotary polygon mirror 12 will be described.

As shown in FIGS. 4 (A) and 4 (B), the rotary polygon mirror 12 has a regular octagonal prism-shaped light reflecting portion 12A having a light beam reflecting surface formed on its side surface and a light reflecting portion 12A. And a disc portion 12B having a large diameter and having a substantially disc shape. These are arranged so that the central axes W thereof coincide with each other.
Is bonded to the lower surface of the disk portion 12B and the upper surface of the disk portion 12B. Further, a hole 12F having a predetermined diameter is provided so as to penetrate the light reflecting portion 12A and the disc portion 12B along the central axis W. Since the rotor 52 (see FIG. 3) of the motor, which will be described later, is fixed to the hole 12F, the hole 12F is an important part for positioning the rotary polygon mirror 12 with respect to the motor.
It is drilled with high dimensional accuracy.

The disk portion 12B corresponds to the large-sized fixing member of the present invention, and the light reflecting portion 12A corresponds to the rotary polygon mirror of the present invention. The rotary polygon mirror 12 in the present embodiment means a member including a light reflecting portion 12A and a disc portion 12B.

A groove 12 for balancing is provided on the disk portion 12B.
D is provided concentrically with respect to the central axis W. Further, outside the groove 12D with respect to the central axis W, a plurality of holes 12E for fixing the rotary polygon mirror are provided concentrically with the central axis W at equal intervals. As is clear from FIG. 4B, the hole 12E is provided with a step, and the head of the rotary polygon mirror fixing screw or the like projects upward from the upper surface of the disk portion 12B to irradiate the reflecting surface 12C. The device is designed to avoid the interruption of the light beam.

FIG. 3 shows a configuration diagram when the rotary polygon mirror 12 is fixed to the motor as described above. The motor in the present embodiment is an outer rotor type motor, and the shaft 54 is fixed to the motor housing 58 by bolts 56. Around the shaft 54, the shaft 5
A rotor 52 that is rotatable around 4 is arranged, and the shaft 54 and the rotor 52 form a radial bearing.

The rotor 52 has a substantially disk-shaped rotating plate 5
0 is fixed. On the upper surface of the rotating plate 50, there is provided a protruding portion 50A for fixing the rotary polygon mirror 12 to the disk portion 12.
It is formed corresponding to the hole 12E of B. A thrust bearing 60 is formed on the outer edge of the rotary plate 50 and faces a thrust bearing 61 formed on the motor housing 58 side. Further, a drive magnet 62 is installed on the lower surface of the rotary plate 50, and faces the drive coil 64 installed on the motor housing 58 side.

With respect to the motor as described above, the rotary polygon mirror 12 has a side surface of the rotor 52 and a protruding portion 50A of the rotary plate 50.
Fixed in. That is, the hole 1 shown in FIG.
The rotor 52 and the shaft 54 are inserted through 2F, and the inner peripheral surface of the hole 12F is fixed to the outer peripheral surface of the rotor 52. Further, each hole 12E of the disk portion 12B is positioned directly above the protruding portion 50A, and the disk portion 12B is fixed to the protruding portion 50A by the screw 44. As described above, the rotary polygon mirror 12 of the present embodiment is fixed to the rotating plate 50 in the rotation axis direction at a portion (disk portion 12B) other than the light reflecting portion 12A having the reflecting surface 12C on the side surface.

Next, the operation of this embodiment will be described. When the operator instructs the image recording apparatus 11 to start the image recording process, the driving coil 6 shown in FIG.
4 is supplied with an electric current, an electromagnetic induction action is generated between the driving coil 64 and the driving magnet 62, and the rotor 52, the rotary plate 50, and the rotary polygon mirror 12 rotate around the shaft 54. That is, the rotary polygon mirror 12 rotates in the direction of arrow P shown in FIG.

On the other hand, the photosensitive member 24 is moved in the direction of arrow Q (=
1, the paper 18 is also conveyed at a predetermined speed in the direction of the arrow G in FIG.

At the time when the rotation of the rotary polygon mirror 12 and the photosensitive member 24 and the conveyance of the paper 18 are stably performed, a light beam corresponding to an image to be recorded is emitted from the laser diode 30.

The light beam, after being collimated by the collimator lens 32, passes through the cylindrical lens 34,
It is focused on the reflecting surface 12C of the rotary polygon mirror 12. Since the rotating polygon mirror 12 rotates in the direction of arrow P, the reflecting surface 12C
The angle of incidence of the light beam on is continuously changed, and the light beam is deflected along the main scanning direction indicated by arrow K.

By the way, the rotary polygon mirror 12 of the present embodiment.
Is fixed to the rotating plate 50 in the rotation axis direction at a portion (disc portion 12B) other than the light reflecting portion 12A having the reflecting surface 12C on its side surface. Therefore, according to the present embodiment, It is possible to prevent the distortion due to the fixing from occurring in the reflecting surface 12C. Therefore, there is no variation or deviation in the traveling direction of the light beam deflected by the reflecting surface 12C, and stable deflection performance can be obtained.

The deflected light beam is fθ lens 2
8, through the cylindrical lens 36 in order, and the photoconductor 2
Image on 4. At this time, the image formation point on the photoconductor 24 moves at a constant speed along the main scanning direction indicated by the arrow K.

On the other hand, the side surface 24A which is the surface to be scanned of the photoconductor 24 is from top to bottom (in the sub-scanning direction) in FIG.
Scrolling. As a result, the side surface 2 of the photoconductor 24
4A will be scanned by the light beam.

In parallel with the exposure of the light beam corresponding to the image to be recorded onto the photoconductor 24 by the optical scanning device 10 as described above, the photoconductor 24 to the paper 18 as will be described below.
Transfer to.

In the photoreceptor 24 charged by the charger 14 shown in FIG. 1, the light receiving portion receiving the light beam from the optical scanning device 10 has a lower potential, and only the light receiving portion having the lowered potential is charged. Toner is attached by the developing device 16.

Here, the toner attached only to the light receiving portion is
From the surface of the photoconductor 24 to the paper 18 by the transfer charger 20.
Is transferred to. The sheet 18 transferred here is conveyed in the direction of arrow G, and the toner on the sheet 18 is fused and fixed by the fixing device 22.

In this manner, the toner adheres to the light receiving portion on the surface of the photoconductor 24 that receives the light from the optical scanning device 10, and the toner is transferred and melted and fixed at the position on the paper 18 corresponding to the adhering position. As a result, the image to be recorded is recorded on the paper 18.

In the transfer to the paper 18 by the transfer charger 20, the toner remaining on the surface of the photoconductor 24 is removed by the cleaner 26, and the surface of the photoconductor 24 from which the toner has been removed is left for a predetermined time. Later optical scanning device 10
The light beam from is again irradiated, and the series of processing relating to exposure and transfer is executed.

In this way, the recording of the image on the paper 18 is continuously executed. According to the present embodiment described above, it is possible to prevent the reflection surface 12C from being distorted due to the fixing of the rotary polygon mirror 12 to the rotating plate 50.
Since there is no variation or deviation in the traveling direction of the light beam deflected by 2C, the deflection performance of the optical scanning device 10 is stable, and accordingly the quality of the image recorded on the paper 18 by the image recording device 11 is stabilized. be able to.

Further, in this embodiment, as shown in FIG. 5, a groove 12D is provided between the fixed position of the rotary polygon mirror 12 on the rotary plate 50 and the reflecting surface 12C. Thereby, for example, when the distortion caused by fixing the rotary polygon mirror 12 to the rotating plate 50 is large, the groove 12D is deformed together with the fixing position (in the vicinity of the hole 12E), and the distortion is absorbed by the groove 12D. It will be.

Therefore, even when the distortion caused by the fixing is large, it is possible to prevent the distortion from reaching the reflecting surface 12C. That is, by providing the groove 12D between the fixed position of the rotary polygon mirror 12 on the rotary plate 50 and the reflecting surface 12C, the effect of preventing the distortion of the reflecting surface 12C can be enhanced.

In the above embodiment, the rotary polygon mirror 12 is used.
Although the form in which the screw is fixed to the rotating portion (rotating plate 50) of the motor in the hole 12E in the axial direction by the screw 44 has been described, the fixing method is not limited to the screw fastening. As shown in FIG. 6, the elastic member 66 may be fixed to the outer edge portion of the disk portion 12B as follows.

That is, in a substantially cylindrical elastic member 66 having a substantially L-shaped cross section and a protrusion 66A on one side of the L-shape, a cylindrical side surface portion 66B is provided at the outer edge portion 50B of the rotary plate 50.
Then, the tip of the protrusion 66A is brought into contact with the upper surface of the outer edge portion of the disc portion 12B, and the disc portion 12B is biased from above. On the other hand, the lower surface of the disk portion 12B has a protruding portion 50A.
Support by. In this way, the rotary polygon mirror 12 is fixed to the rotary plate 50 by supporting the lower surface of the disk portion 12B by the protruding portion 50A and urging the outer edge portion from above by the elastic member 66 as described above. In addition,
A step portion 12G is formed on the outer edge portion of the disk portion 12B,
The projecting portion 66A is configured to abut on the step portion 12G so that the light beam with which the reflecting surface 12C is irradiated is not blocked by the elastic member 66.

The rotary polygon mirror 1 in the above embodiment.
In FIG. 2, a disk-shaped disk portion 12B is used as a member that supports the light reflecting portion 12A, but the member that supports the light reflecting portion 12A does not have to be a disk shape, and may have a polygonal columnar shape or a truncated cone shape. It may be.

By the way, as a mounting structure of the rotary polygon mirror for preventing the distortion due to the fixing from reaching the reflecting surface of the rotary polygon mirror, as shown in FIGS. There is a mounting structure that fastens 50 and the disk portion 12B.

As shown in FIGS. 10 and 11, by fastening the disk portion 12B to the rotary plate 50 from the rotary plate 50 side, the disk portion 12B is not on the outer side of the reflecting surface 12C but on the shaft 54 side as in the above embodiment. Even when fastened, the light reflecting portion 12A
It is possible to realize a mounting structure that indirectly fastens the
It is possible to prevent the distortion due to the fixing from occurring on the reflecting surface of the rotary polygon mirror. Further, in this case, the size (diameter) of the disk portion 12B viewed in the radial direction of the shaft 54 does not necessarily need to be larger than the size of the light reflecting portion 12A, so that the disk portion 12B can have an allowable range in terms of rigidity. The size can be reduced.

[0060]

According to the invention described in each of claims 1 and 2 , the rotary polygon mirror is not directly fastened to the rotary plate, but is indirectly connected to the rotary plate by using a fixed member (or a large fixed member). Since they are fastened together, it is possible to prevent the conventional distortion caused by fixing from occurring on the reflecting surface of the rotary polygon mirror.

Further, according to the first aspect of the present invention, since the distortion due to the fixation is absorbed at the deformation absorbing portion, the distortion is prevented from reaching the reflecting surface of the rotary polygon mirror, and the distortion of the reflecting surface is prevented. The effect that the prevention effect can be enhanced is obtained.

According to the second aspect of the invention, since the size of the fixing member viewed in the radial direction of the rotation axis does not necessarily have to be larger than the size of the rotary polygon mirror, the size is fixed within an allowable range in terms of rigidity. The effect that the member can be downsized can also be obtained.

[Brief description of drawings]

FIG. 1 is a schematic overall configuration diagram of an image recording apparatus having a built-in optical scanning device.

FIG. 2 is a schematic view of the optical scanning device as viewed from the vertically upper side.

FIG. 3 is an arrangement diagram showing an arrangement of a rotary polygon mirror and a motor.

FIG. 4A is a schematic perspective view of a rotary polygon mirror,
(B) is a sectional view showing a section taken along line 4-4 in (A).

FIG. 5 is an arrangement diagram showing an arrangement of a rotary polygon mirror and a rotating portion of a motor.

FIG. 6 is a diagram showing an aspect in which a rotary polygon mirror and a rotating portion of a motor are fixed by an elastic member.

FIG. 7 is an arrangement diagram showing an arrangement of a conventional rotary polygon mirror and a motor.

FIG. 8A is a diagram showing an example of the distortion of the reflecting surface when the fixed position in the axial direction of the conventional rotary polygon mirror and the position supporting the rotary polygon mirror are different, and FIG. FIG. 8 is a diagram showing an example of distortion of the reflecting surface when the fixed position in the axial direction of the rotating polygon mirror and the position supporting the rotating polygon mirror match.

FIG. 9 is a diagram showing an example in which the flatness of a reflecting surface is deteriorated in a conventional rotary polygon mirror.

FIG. 10 is a view showing a mounting structure in which a disc portion is fixed to a rotary plate from the rotary plate side.

FIG. 11 is a view showing a mounting structure in which a disc portion is fixed to a rotary plate from the rotary plate side.

[Explanation of symbols]

10 Optical scanning device 11 Image recording device 12 rotating polygon mirror 12A light reflector 12B Disk part (fixing member) 12C reflective surface 44 screws (fastening means) 50 rotating plate 54 shaft

Claims (2)

(57) [Claims] 1. A rotary polygon mirror mounting structure for mounting a polygonal polygonal rotary polygon mirror having a reflecting surface for deflecting a light beam on a side surface thereof to a rotary plate rotating integrally with a rotary shaft of a motor. , The rotary polygon mirror is fixed or integrally formed with the rotary polygon mirror, and the dimension in the radial direction of the rotation axis is larger than that of the rotary polygon mirror.
A large fixing member and the rotating plate on the outside of the reflecting surface with the large fixing member.
It has an outer fastening means for fastening to, the large fixing member, the reflective surface of the rotary polygon mirror and entered into the engaged position on the rotating plate
Between the position of and, there is a deformation absorption site to absorb the deformation.
An attachment structure for a rotating polygon mirror, characterized by having . 2. A rotary polygon mirror mounting structure for mounting a polygonal polygonal rotary polygonal mirror having a reflecting surface for deflecting a light beam on a side surface thereof to a rotary plate which rotates integrally with a rotary shaft of a motor. A fixed member to which the rotary polygon mirror is fixed or integrally formed with the rotary polygon mirror; and the rotary plate on the rotary shaft side of the fixed member with respect to the reflection surface.
And an inner fastening means for fastening from the side of the rotating plate , the mounting structure of the rotary polygon mirror.