JP2018010150A - Optical scanner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical scanner that prevents vibration of a reflection mirror from being increased by vibration of a lateral wall of an optical box.SOLUTION: An intermediate member 10 is provided in each of the spaces between the central part of a reflection mirror 405 in the longitudinal direction and two fixing mechanisms for fixing the reflection mirror 405, and both intermediate members 10 are fixed to the reflection mirror 405 and an inner surface of a lateral wall 501 of an optical box to reduce vibration of the reflection mirror 405.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an optical scanning device provided in an electrophotographic image forming apparatus.

  An image forming apparatus using an electrophotographic system exposes a photosensitive member with a light beam emitted from an optical scanning device, thereby forming a latent image on the photosensitive member and developing the latent image with toner. In this image forming apparatus, a toner image developed on a photosensitive member is transferred onto a recording material, and the toner image on the recording material is fixed on the recording material by a fixing device. Further, the image forming apparatus discharges the recording material on which the fixing process has been performed.

  The optical scanning device includes a deflecting device that deflects the light beam so that the light beam emitted from the light source scans on the photoconductor. The deflecting device includes, for example, a rotary polygon mirror having a plurality of reflection surfaces and a drive motor for rotating the mirror, or a galvano mirror having one reflection surface and a drive motor for reciprocating the galvano mirror. The light beam deflected by the deflecting device is guided onto the photosensitive member by a lens and a mirror provided in an optical box of the optical scanning device.

  In such an optical scanning device, when the vibration frequency of the drive motor matches the frequency of the intrinsic signal of the mirror, the mirror resonates. When the mirror resonates, the optical path of the reflected light beam vibrates, which may cause image defects. In many cases, the mirror receives a pressing force from a leaf spring and is fixed to the optical box. However, the mirror does not receive a pressing force in the entire longitudinal direction of the mirror, and the mirror can move in the longitudinal direction and the width direction. For this reason, the position of the mirror may slightly fluctuate due to vibration during transportation such as when the image forming apparatus is shipped.

  In Patent Document 1, in order to reduce the vibration of the reflection mirror, an intermediate member disposed between the reflection mirror and the side wall of the optical box and at the center in the longitudinal direction of the reflection mirror is used as the reflection mirror and the side wall of the optical box. An optical scanning device that is bonded with a rubber adhesive is disclosed. The vibration of the reflection mirror is reduced by bonding the intermediate member to the reflection mirror and the side wall of the optical box. Further, since the reflection mirror is bonded and fixed to the optical box via the intermediate member, the intermediate member has an effect of suppressing the change in the posture of the reflection mirror due to vibration during distribution.

JP 2012-93474 A

  However, Patent Document 1 has the following problems. That is, since the side wall of the optical box has a thin plate shape, the side wall surface facing the central portion of the reflecting mirror is located away from the corner of the side wall. Therefore, the portion is structurally low in rigidity and tends to be weak against vibration. Although it is desirable to fix the central part in order to suppress the vibration of the reflection mirror alone, if the mirror is bonded to a place vulnerable to such vibration via a fixing member, it will be affected by the vibration of the side wall. The reflection mirror itself vibrates, and a sufficient vibration reduction effect cannot be obtained.

  Accordingly, an object of the present application is to reduce the vibration of the mirror without being affected by the vibration of the side wall of the optical box.

  The optical scanning device of the present invention includes a light source that emits a light beam, a rotating polygon mirror that deflects the light beam so that the light beam emitted from the light source scans on a photosensitive member, and the rotating polygon mirror. A deflection device including a drive motor that rotates about a shaft, a reflection mirror that is housed in the optical box and guides a light beam deflected by the deflection device onto a photosensitive member, the deflection device, and the reflection mirror Is a first support portion for supporting one end side of the reflection mirror in the longitudinal direction of the reflection mirror, and a first pressing the reflection mirror against the first support portion. A first fixing mechanism including a first attachment portion to which the plate spring is attached, a second support portion for supporting the other end side of the reflection mirror in the longitudinal direction of the reflection mirror, and the second support Said part A second fixing mechanism including a second attachment portion to which a second leaf spring for pressing the reflecting mirror is attached, and the reflection mirror is formed by the first support portion and the second support portion. An optical box in which the first fixing mechanism and the second fixing mechanism are provided so as to be supported along one side wall of the optical box, a center of the reflection mirror in the longitudinal direction, and the first A first intermediate member bonded to both the inner surface of the side wall of the optical box and a surface other than the reflecting surface of the reflecting mirror, and the center of the reflecting mirror in the longitudinal direction, A second intermediate member bonded to both the inner surface of the side wall of the optical box and a surface other than the reflecting surface of the reflecting mirror is provided between the second supporting portion and the second supporting portion.

  According to the present invention, since the first intermediate member and the second intermediate member are arranged avoiding the inner surface of the side wall facing the central part of the reflection mirror, the influence of the vibration of the side wall of the optical box on the reflection mirror is affected. Can be suppressed.

The figure which shows the optical scanning device, intermediate member, and dynamic vibration absorber in an Example Sectional drawing of the AA part shown by FIG. The figure which shows the vibration characteristic of the reflective mirror with which the optical scanning device in the Example was equipped Sectional drawing of the AA part shown by FIG. Diagram showing vibration acceleration of reflection mirror The figure which shows the vibration reduction effect of the reflective mirror 405 The perspective view of the optical scanning device with which the intermediate member in the Example was attached, and the perspective view of the optical scanning device of a comparative example A perspective view and a sectional view showing an optical scanning device for black Diagram showing the shape of the intermediate member The perspective view and sectional drawing of the optical scanning device in an Example The figure which shows the image forming apparatus in an Example

(Image forming device)
FIG. 11 is a schematic cross-sectional view of a digital full-color printer (color image forming apparatus) that forms an image using a plurality of colors of toner. Hereinafter, an embodiment using FIG. 11 will be described. An embodiment will be described by taking a color image forming apparatus and an optical scanning device provided therein as an example. However, the embodiment is not limited to the color image forming apparatus and the optical scanning device provided therein, and a single color toner (for example, black) It is also possible to use an image forming apparatus that forms an image by itself and an optical scanning device provided in the image forming apparatus.

  The image forming apparatus 100 includes four image forming units (image forming units) 101Y, 101M, 101C, and 101Bk that form images according to colors. Here, Y, M, C, and Bk represent yellow, magenta, cyan, and black, respectively. The image forming units 101Y, 101M, 101C, and 101Bk perform image formation using toners of yellow, magenta, cyan, and black, respectively.

  The image forming units 101Y, 101M, 101C, and 101Bk are provided with photosensitive drums 102Y, 102M, 102C, and 102Bk that are photosensitive members. Around the photosensitive drums 102Y, 102M, 102C, and 102Bk, charging devices 103Y, 103M, 103C, and 103BK, optical scanning devices 104Y, 104M, 104C, and 104Bk, and developing devices 105Y, 105M, 105C, and 105Bk are provided, respectively. . In addition, drum cleaning devices 106Y, 106M, 106C, and 106Bk are disposed around the photosensitive drums 102Y, 102M, 102C, and 102Bk.

  An endless belt-like intermediate transfer belt 107 is disposed below the photosensitive drums 102Y, 102M, 102C, and 102Bk. The intermediate transfer belt 107 is stretched around a driving roller 108 and driven rollers 109 and 110, and rotates in the direction of arrow B in the figure during image formation. In addition, primary transfer devices 111Y, 111M, 111C, and 111Bk are provided at positions facing the photosensitive drums 102Y, 102M, 102C, and 102Bk via the intermediate transfer belt 107 (intermediate transfer member).

  The image forming apparatus 100 according to the present exemplary embodiment also includes a secondary transfer device 112 for transferring the toner image on the intermediate transfer belt 107 to the recording medium S, and a fixing device 113 for fixing the toner image on the recording medium S. Is provided.

  Here, an image forming process from the charging process to the developing process of the image forming apparatus 100 having such a configuration will be described. Since the image forming process in each image forming unit is the same, the image forming process will be described using the image forming unit 101Y as an example, and the description of the image forming processes in the image forming units 101M, 101C, and 101Bk will be omitted.

  First, the photosensitive drum 102Y that is rotationally driven by the charging device of the image forming unit 101Y is charged. The charged photosensitive drum 102Y (on the image carrier) is exposed by a light beam emitted from the optical scanning device 104Y. As a result, an electrostatic latent image is formed on the rotating photoconductor. Thereafter, the electrostatic latent image is developed as a yellow toner image by the developing device 105Y.

  Hereinafter, the image forming process after the secondary transfer process will be described by taking the image forming unit as an example. The yellow, magenta, cyan, and black toner images formed on the photosensitive drums 102Y, 102M, 102C, and 102Bk of the image forming units when the primary transfer devices 111Y, 111M, 111C, and 111Bk apply a transfer bias to the transfer belt. Are respectively transferred to the intermediate transfer belt 107. As a result, the toner images of the respective colors are superimposed on the intermediate transfer belt 107.

  When the four-color toner image is transferred to the intermediate transfer belt 107, the four-color toner image transferred onto the intermediate transfer belt 107 is transferred from the manual feed cassette 114 or the paper feed cassette 115 by the secondary transfer device 112. Transfer (secondary transfer) is performed again on the recording medium S conveyed to the next transfer portion T2. Then, the toner image on the recording medium S is heated and fixed by the fixing device 113 and discharged to the paper discharge unit 116, and a full color image is obtained on the recording medium S.

  The photosensitive drums 102Y, 102M, 102C, and 102Bk that have been transferred have their residual toner removed by the drum cleaning devices 106Y, 106M, 106C, and 106Bk, and then the above-described image forming process continues.

(Configuration of optical scanning device)
FIG. 10A is a perspective view of the optical scanning device 104. FIG.10 (b) is CC sectional drawing in Fig.10 (a).

  As shown in FIG. 10A, the optical unit 200 is attached to the optical box 401. The optical box 401 has a shape opened up and down, and the inside is sealed by attaching an upper cover and a lower cover (not shown). Inside the optical box 401 is a polygon mirror 402 (rotating polygonal mirror) which is a deflecting means for deflecting the light beam emitted from the optical unit so that the light beam scans on the photosensitive drum 102 in a predetermined direction. Is provided. The polygon mirror 402 is rotationally driven by a motor 403 shown in FIG. The light beam deflected by the polygon mirror 402 is incident on the first fθ lens 404. The light beam that has passed through the first fθ lens 404 is reflected by the reflection mirror 405 and the reflection mirror 406 and is incident on the second fθ lens 407. The light beam that has passed through the second fθ lens 407 is reflected by the third mirror 408, passes through the dust-proof glass 409, and is guided onto the photosensitive drum 102. The light beam that has passed through the first fθ lens 404 and the second fθ lens 407 forms an image on the photosensitive drum 102 and scans the photosensitive drum 102 at a constant speed.

  As shown in FIG. 10A, both ends of the reflection mirror 405 are pressed toward the optical box 401 by the leaf spring 417. Similarly, the reflection mirror 406 and the reflection mirror 408 are pressed against the optical box 401 by a leaf spring (not shown). Since the reflection mirror 405 is a member that reflects the scanning light, it has an elongated shape in the scanning direction of the laser light, as shown in FIG. As can be seen from FIGS. 7A and 7B, the reflection mirror 405 has a prismatic shape, and the corners are chamfered. The reflection mirror 405 of this embodiment is a quadrangular prism. The reflection mirror 406 and the reflection mirror 407 have the same shape. The reflection mirror 405 is a glass mirror. The length of the reflection mirror 405 in the longitudinal direction is 165 mm. The direction corresponding to the sub-scanning direction of the reflection mirror 405 is 10 mm. The thickness of the reflection mirror 405 is 5 mm.

  FIG. 1 is an enlarged view of the optical scanning device shown in FIG. A reflection mirror 405 is accommodated inside the optical box 401 along the side wall 501 of the optical box 401. An attachment portion to which a plurality of leaf springs 417 are attached is provided on the side wall of the optical box 401. In the longitudinal direction of the reflection mirror 405, the reflection mirror 405 and the side wall 501 of this embodiment are parallel.

  FIG. 2 is a view showing a cross section taken along line AA of FIG. As shown in FIG. 2, support portions 21 and 22 that support the reflection mirror 405 are formed in the optical box 401. The support unit 21 includes a support surface 21 a that contacts the same surface as the reflection surface of the reflection mirror 405. The support unit 22 includes a support surface 22 a that supports a surface adjacent to the reflection surface of the reflection mirror 405. The support part 21 and the support part 22 are provided at both ends of the reflection mirror 405 in the longitudinal direction of the reflection mirror 405. The distance between the support portions at both ends is 154 mm. The plurality of support portions 21 that support both ends of the reflection mirror 405 support the reflection mirror 405 outside the scanning region of the light beam. The right side of a reflection mirror 405 in FIG. 6 to be described later is one end side, and the left side is the other end side. In the longitudinal direction of the reflection mirror 405, the positions of the support part 21 and the support part 22 on one end side are the same, and the positions of the support part 21 and the support part 22 on the other end side are the same. The width in the longitudinal direction of the reflection mirror 405 of the support surface 21a and the support surface 22a is 2 mm. The support part 21, the support part 22, the leaf spring 417, and the attachment part on one end side constitute a first fixing mechanism for fixing the reflection mirror 405 in the optical box 401. The support surface 21 a and the support surface 22 a on one end side are provided at a position 6 mm from one end of the reflection mirror 405. Further, the support portion 21, the support portion 22, the leaf spring 417, and the attachment portion on the other end side constitute a second fixing mechanism for fixing the reflection mirror 405 in the optical box 401. The support surface 21 a and the support surface 22 a on the other end side are provided at a position of 3.5 mm from one end of the reflection mirror 405.

(Reflection mirror vibration suppression mechanism)
FIG. 1 is a view showing a vibration suppressing mechanism of the reflection mirror 405 in the present embodiment. A dynamic vibration absorber having a weight 11 and a double-sided tape 12 is attached to the back surface of the opposite reflection surface. In the longitudinal direction of the reflection mirror 405, the weight 11 is fixed to a surface different from the reflection surface of the reflection mirror 405 (specifically, the back surface of the reflection surface) by the double-sided tape 12 at the center. The double-sided tape 12 is attached to the central portion of the reflection mirror 405 (the antinode portion of the vibration of the reflection mirror 405). The width of the double-sided tape 12 in the longitudinal direction of the reflection mirror 405 is 50 mm, and is pasted at a position of 57.5 mm to 107.5 mm from one end side of the reflection mirror 405. The weight 11 has free ends on both sides with respect to the double-sided tape 12 in the longitudinal direction of the reflection mirror 405. The length of the weight is 115 mm, and both ends 32.5 mm not attached to the double-sided tape 12 are free ends. When vibration energy is transmitted to the reflection mirror 405, the dynamic vibration absorber absorbs the vibration energy and the free end vibrates. When the weight 11 of the dynamic vibration absorber vibrates, the amplitude of the reflecting surface 405 is suppressed. The double-sided tape 12 is attached to the central portion of the reflection mirror 405 (the antinode portion of the vibration of the reflection mirror 405).

  FIG. 3 is a graph showing the vibration characteristics of the reflection mirror 405 when the vibration from 300 Hz to 600 Hz is swept. The horizontal axis represents frequency and the vertical axis represents vibration acceleration. The larger the vertical axis, the greater the vibration at that frequency.

  FIG. 3A shows the vibration characteristics of the reflection mirror 405 to which no dynamic vibration absorber is attached. According to FIG. 3A, it can be seen that the reflection mirror 405 to which no dynamic vibration absorber is attached has a natural frequency in the vicinity of 500 Hz. For example, in this system, when the excitation frequency of the motor 403 is in the vicinity of 500 Hz, the reflection mirror 405 vibrates greatly, and it can be said that the system is weak against the vibration of the motor 403.

  In contrast, FIG. 3B shows the vibration characteristics of the reflection mirror 405 to which the dynamic vibration absorber is attached. According to FIG. 3B, the peak near 500 Hz is greatly reduced in the reflection mirror 405 to which the dynamic vibration absorber is attached. This is considered because the vibration energy that vibrates the reflection mirror 405 is converted into the vibration energy of the weight of the dynamic vibration absorber as described above.

(Stabilization of mirror posture)
In FIG. 1, the reflection mirror 405 is connected to the inner surface of the side wall of the optical box 401 by two intermediate members 10 (a first intermediate member and a second intermediate member). The intermediate member 10 is a member bonded to the reflection mirror 405 and the inner surface of the side wall 501 in order to suppress vibration and movement of the reflection mirror 405 supported on the support portion 21 and the support portion 22.

  The shape of the intermediate member 10 is demonstrated using FIG. 9 (a) (b). As shown in FIG. 9, the intermediate member 10 has a substantially triangular shape, and includes contact surfaces 10 a, 10 b, and 10 c (contact planes) substantially along each side. The intermediate member 10 includes application areas 10d, 10e, and 10f for applying an adhesive.

  In the structure in which the distance between the inner surface of the side wall 501 and the reflection mirror 401 is short, the reflection mirror is arranged so that the longest triangular side contacts the inner surface of the side wall 501 as shown in FIG. The intermediate member 10 is placed between 405 and the side wall 501. The angle formed by the contact surface 10a and the contact surface 10c is substantially equal to the angle formed by the plane on the reflection mirror 405 side that the contact surface 10a contacts and the plane on the side wall 501 side that the contact surface 10c contacts. In this state, the contact surface 10a contacts the surface of the reflection mirror 405, and the contact surface 10c contacts the inner surface of the side wall 501. The intermediate member 10 is adhered to the reflection mirror 401 and the inner surface of the side wall 501 by applying an adhesive to the application regions 10d and 10e.

  In the structure in which the distance between the inner surface of the side wall 501 and the reflection mirror 401 is long, when the optical scanning device is assembled, the side that is not the longest side of the wedge-shaped triangle is formed on the inner surface of the side wall 501 as shown in FIG. The intermediate member 10 is placed between the reflection mirror 405 and the side wall 501 so as to come into contact with each other. The angle formed by the contact surface 10a and the contact surface 10b is substantially equal to the angle formed by the plane on the reflection mirror 405 side that the contact surface 10a contacts and the plane on the side wall 501 side that the contact surface 10b contacts. In this state, the contact surface 10b and the surface of the reflection mirror 405 are in contact with each other, and the contact surface 10a and the inner surface of the side wall 501 are in contact with each other. The intermediate member 10 is adhered to the reflection mirror 401 and the inner surface of the side wall 501 by applying an adhesive to the application regions 10f and 10e.

  In the image forming apparatus of this embodiment, in order to extend the life of the Bk photoconductor that is printed in the market, two types of optical scanning devices, an optical scanning device corresponding to YMC and an optical scanning device corresponding to K, are mounted. doing. The first optical scanning device shown in FIG. 1 corresponds to YMC, and the second optical scanning device corresponding to Bk is shown in FIG. Although the components such as the polygon motor 402 and the mirror 405 are almost the same, the shape of the optical box is slightly different. Therefore, the distance L between the mirror 405 and the wall surface of the optical box is different, and the relationship is L1 <L2 as compared with the first optical scanning device of FIG. Therefore, the intermediate member 10 fixed to the reflection mirror and the inner surface of the side wall cannot be mounted by the same mounting method. Therefore, as shown in FIG. 8, the intermediate member 10 is formed in an intermediate member shape that can cope with both by changing the mounting direction without changing the shape of the intermediate member 10.

  As shown in FIGS. 9A and 9B, the two intermediate members 10 are in contact with both the inner surface of the side wall 501 of the optical box 401 and both end portions of the reflection mirror 405, and are adhesively fixed. The side wall 501 vibrates most at the weakly rigid central portion and approaches the corner of the optical box 401 as it goes to the end, so that the vibration is reduced. In the present embodiment, since the plurality of intermediate members 10 are provided on the end side of the side wall 501, the reflection mirror 401 is less susceptible to the vibration of the side wall 501.

  FIG. 2 is a cross-sectional view taken along line AA in FIG. 1 and shows a state in which the intermediate member 10 is fixed. The intermediate member 10 is inserted on the wedge between the reflection mirror 405 and the side wall 501. The adhesive region 13 is coated with an ultraviolet curable resin. The intermediate member 10 is bonded and fixed to the inner surface of the reflection mirror 10 and the side wall 501 by irradiating the bonding region 13 with ultraviolet rays.

  The leaf spring 417 in this embodiment presses only the back surface of the reflection surface of the reflection mirror 405. Therefore, as shown in FIGS. 4A and 4B, the reflection mirror 405 is in contact with the seating surface 22 a of the support portion 22 while being in contact with the seating surface 21 a of the support portion 21. In some cases, contact may not occur. The diagram shown in FIG. 5 shows the vibration acceleration at 500 Hz of the reflection mirror 401 when the posture of the reflection mirror 405 is that shown in FIGS. In addition, both are the measurement results in a state where the above-described dynamic vibration absorber is mounted. As can be seen from FIG. 5, the vibration acceleration differs by about twice depending on whether or not the reflecting mirror 405 and the optical box 401 are in contact with each other. As described above, since the state shown in FIG. 4B can sufficiently occur due to vibration in transportation, in order to stably create the state of FIG. 4A in which the reflection mirror 405 contacts the optical box 401, It is necessary to suppress the movement of the reflection mirror 405 by the intermediate member 10 described above.

(Vibration reduction effect of this example and conventional example)
6 and 7 are diagrams showing the vibration reduction effect of the reflection mirror 405 in this embodiment. 6A shows a configuration in which neither the dynamic vibration absorber nor the intermediate member 10 is attached to the reflection mirror 405, and FIG. 6B shows a configuration in which the intermediate member 10 is attached to the central portion of the reflection mirror 405 as in the conventional example. FIG. 6C shows the vibration acceleration in the configuration in which the dynamic vibration absorber and the intermediate member 10 are mounted on the reflection mirror 405 in this embodiment.

  As shown in FIG. 6C, one intermediate member 10 is provided between the central portion of the reflection mirror 405 in the longitudinal direction and two fixing mechanisms for fixing the reflection mirror. The intermediate member 10 on one end side of the reflection mirror 405 is fixed to the reflection mirror 405 so that one end of the intermediate member 10 is positioned at 16 mm from one end of the reflection mirror 405. The intermediate member 10 on the other end side of the reflection mirror 405 is fixed to the reflection mirror 405 so that the other end of the intermediate member 10 is positioned 15 mm from the other end of the reflection mirror 405. The width of the intermediate member 10 in the longitudinal direction of the reflection mirror 405 is 5 mm.

  FIGS. 7A to 7C correspond to FIGS. 6A to 6C, respectively, and show vibration accelerations at the center of the reflection mirror 405 and the side wall 501 of the optical box 401. FIG. As can be seen from FIG. 7, the vibration of the reflection mirror 405 has the worst structure in FIG. 6A, and the vibration acceleration decreases in the order of the structure in FIG. 6B and the structure in FIG. I understand. The reason why the structure shown in FIG. 6B has a larger vibration acceleration than the structure shown in FIG. 6C is that the intermediate member 10 is fixed to the center of the side wall 501 in the structure shown in FIG. It is thought that it is influenced by the vibration of. On the other hand, when looking at the vibration acceleration at the center of the side wall 510, the structure in FIG. 6B is the smallest, and the structure in FIG. 6C has increased vibration compared to the structure in FIG. 6B. Recognize. In the structure of FIG. 6B, although the vibration of the central portion of the side wall 501 is reduced, the vibration of the reflection mirror 405 is increased correspondingly. In the structure of FIG. 6C, the central portion of the side wall 501 is vibrated. However, the vibration of the central part of the reflection mirror 405 and the side wall 501 is separated, and the vibration of the reflection mirror 405 is reduced. In the composition of FIG. 6C, the vibration of the central portion of the side wall 501 increases more than the structure of FIG. 6B, but it is the vibration of the reflection mirror 405 that leads to an actual image defect. No matter how much the side wall of the optical box 401 vibrates, the image does not become defective unless the reflecting mirror 405 vibrates. Therefore, it can be said that the structure of FIG. 6C in which the vibration of the reflection mirror 405 is the smallest is a high quality system that has the least influence on the image defect.

  As described above, one intermediate member 10 is provided between the central portion of the reflecting mirror 405 in the longitudinal direction and the two fixing mechanisms for fixing the reflecting mirror 405, and the reflecting mirror 405 and the optical box are provided. By fixing both intermediate members 10 to the inner surface of the side wall 501 of 401, vibration of the reflection mirror 405 can be suppressed.

DESCRIPTION OF SYMBOLS 10 Intermediate member 100 Image forming apparatus 403 Motor 405 Reflecting mirror

Claims (7)

A light source that emits a light beam;
A deflection apparatus comprising: a rotary polygon mirror that deflects the light beam so that the light beam emitted from the light source scans on a photoreceptor; and a drive motor that rotates the rotary polygon mirror;
A reflection mirror that is housed inside the optical box and guides the light beam deflected by the deflecting device onto a photoreceptor;
An optical box that houses the deflecting device and the reflection mirror therein, the first support portion for supporting one end side of the reflection mirror in the longitudinal direction of the reflection mirror, and the first support portion on the first support portion A first fixing mechanism including a first attachment portion to which a first leaf spring for pressing the reflection mirror is attached; and a second support for supporting the other end side of the reflection mirror in the longitudinal direction of the reflection mirror. And a second fixing mechanism including a second attachment part to which a second leaf spring for pressing the reflection mirror is attached to the second support part, and the first support part and the second support part. An optical box in which the first fixing mechanism and the second fixing mechanism are provided so that the reflecting mirror is supported along one side wall of the optical box by the support part;
A first intermediate member bonded to both the inner surface of the side wall of the optical box and the surface other than the reflecting surface of the reflecting mirror between the center of the reflecting mirror and the first fixing mechanism in the longitudinal direction When,
A second intermediate member bonded to both the inner surface of the side wall of the optical box and the surface other than the reflecting surface of the reflecting mirror between the center of the reflecting mirror and the second support portion in the longitudinal direction. And an optical scanning device.   The first support part and the second support part are provided in the optical box so as to face a reflection surface of the reflection mirror, and the first intermediate member and the second intermediate member are provided with the reflection surface. The optical scanning device according to claim 1, wherein the optical scanners are bonded to different same surfaces. The reflection mirror is supported by the first support portion and the second support portion so that a facing surface facing the side wall of the reflection mirror moves away from the inner surface of the side wall toward the opening of the optical box,
The first intermediate member and the second intermediate member include a first plane that contacts a surface that faces the inner surface of the side wall included in the reflection mirror, and a second plane that contacts the inner surface of the side wall, The optical scanning device according to claim 1, wherein:   The angle formed by the first plane and the second plane is substantially equal to the angle formed by the side surface of the reflection mirror that contacts the first plane and the second plane. The optical scanning device according to claim 3.   5. The optical scanning device according to claim 3, wherein the reflection mirror supported by the first support part and the second support part are parallel to an inner surface of the side wall. 6. A dynamic vibration absorber is attached to a surface different from the reflection surface of the reflection mirror, and absorbs vibration of the reflection mirror,
3. The optical scanning device according to claim 1, wherein the first intermediate member and the second intermediate member are bonded to the reflection mirror at both ends of the dynamic vibration absorber in the longitudinal direction. .   The first support part and the second support part are provided in the optical box so as to face a reflection surface of the reflection mirror, and the first intermediate member and the second intermediate member are provided with the reflection surface. The optical scanning device according to claim 1, wherein the optical scanning devices are bonded to different same surfaces.

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