JP6610875B2 - Optical scanning device and image forming apparatus - Google Patents

Description

  The present invention relates to an image forming apparatus such as a copying machine, a printer, a facsimile, or a complex machine thereof, and an optical scanning device installed there.

  Conventionally, in an image forming apparatus such as a copying machine or a printer, a metal is used for the purpose of reducing vibration generated in an optical deflector of an optical scanning device for forming a latent image on a photosensitive drum (image carrier). A technique is known in which an optical deflector in which a polygon mirror or the like is held on a substrate is screwed to a plurality of convex bearing surfaces formed on an optical frame (housing) (see, for example, Patent Document 1). .

Specifically, in Patent Document 1, the optical scanning device includes a light source that emits light corresponding to image information toward the optical deflector, an optical deflector that deflects incident light emitted from the light source, and optical deflection. An optical element for guiding the light deflected by the device to the surface of the photosensitive drum is provided. The optical deflector is provided with a polygon mirror, a polygon motor, and the like on a substrate made of a metal material. Furthermore, the above-described light source, optical deflector, optical element, and the like are provided in the optical frame (housing).
A plurality of convex portions (boss portions) are formed on the bottom surface (reference surface) inside the optical frame, and the optical deflector is placed on the seating surface of the plurality of convex portions. The substrate of the optical deflector is screwed to the convex portion. Accordingly, the optical deflector is not held in direct contact with the bottom surface of the optical frame, but is held in a space with respect to the bottom surface.

The technology of Patent Document 1 described above can expect a certain degree of effect of reducing vibration generated in an optical deflector in an optical scanning device with a relatively simple configuration at a relatively low cost without installing a vibration isolator or the like. it can.
However, in a high-speed machine in which the polygon mirror is driven to rotate at a higher speed, vibration generated in the optical deflector in the optical scanning apparatus may not be sufficiently reduced. If a large vibration is generated in the optical deflector, band-shaped density unevenness (banding image) in the main scanning direction is generated in the image formed on the photosensitive drum.

  The present invention has been made to solve the above-described problems, and vibration generated in the optical deflector is further reduced with a relatively low cost and relatively simple configuration without installing a vibration isolator or the like. An optical scanning device and an image forming apparatus are provided.

The optical scanning device according to the present invention includes an optical deflector for deflecting light emitted from a light source, a housing in which the optical deflector is provided, and one end side fixed to the fixing portion of the housing together with the optical deflector. are, e Bei and a bridging member which is fixed to the portion different from the fixed portion in the other end the housing, the light deflector, be those polygon mirror on a substrate is installed rotatably The substrate of the optical deflector is sandwiched between the one end side of the bridging member and the fixing portion, and the substrate and the one end side of the bridging member serve as the fixing portion. It has been tightened together .

  According to the present invention, it is possible to provide an optical scanning device and an image forming apparatus in which vibration generated in the optical deflector is further reduced with a relatively simple configuration at a relatively low cost.

1 is an overall configuration diagram illustrating an image forming apparatus according to an embodiment of the present invention. 2 is a cross-sectional view illustrating an image forming unit in the image forming apparatus. FIG. It is a perspective view which shows the inside of an optical scanning device. It is a side view which shows the inside of an optical scanning device. It is a perspective view which shows the state by which the optical deflector was hold | maintained at the housing | casing. It is a side view which shows the state by which the optical deflector was hold | maintained at the housing | casing. When holding an optical deflector directly in a housing, (A) a schematic diagram showing a state where resonance does not occur, and (B) a schematic diagram showing a state where resonance occurs.

  Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the part which is the same or it corresponds, The duplication description is simplified or abbreviate | omitted suitably.

First, the overall configuration and operation of the image forming apparatus 100 will be described with reference to FIGS.
As shown in FIG. 1, an intermediate transfer belt device 15 is installed in the center of the image forming apparatus main body 100. Further, process cartridges 6Y, 6M, 6C, and 6BK corresponding to the respective colors (yellow, magenta, cyan, and black) are arranged in parallel so as to face the intermediate transfer belt 8 (intermediate transfer member) of the intermediate transfer belt device 15. Yes. Further, two optical scanning devices 5A and 5B are arranged in parallel above the process cartridges 6Y, 6M, 6C, and 6BK.

  Referring to FIG. 2, a process cartridge 6Y corresponding to yellow includes a photosensitive drum 1Y as an image carrier, a charging device 4Y (charging unit) disposed around the photosensitive drum 1Y, and a developing device 3Y ( The developing unit), the cleaning device 2Y (cleaning unit), the charge eliminating unit (not shown), and the like are configured to be detachable (replaceable) from the image forming apparatus main body 100 as one unit. Then, an image forming process (charging process, exposure process, developing process, transfer process, cleaning process) is performed on the photosensitive drum 1Y, and a yellow image is formed on the photosensitive drum 1Y. That is, the process cartridge 6Y constitutes an image forming unit together with the primary transfer roller 9Y (primary transfer device) and the like.

  The other three process cartridges 6M, 6C, and 6BK (image forming unit) have substantially the same configuration as the process cartridge 6Y (image forming unit) corresponding to yellow except that the color of the toner used is different. Therefore, an image corresponding to each toner color is formed. Hereinafter, description of the other three process cartridges 6M, 6C, and 6BK (image forming unit) will be omitted as appropriate, and only the process cartridge 6Y (image forming unit) corresponding to yellow will be described.

Referring to FIG. 2, the photosensitive drum 1Y (image carrier) is driven to rotate clockwise by a motor (not shown). Then, the surface of the photosensitive drum 1Y is uniformly charged at the position of the charging device 4Y (charging roller) (this is a charging process).
Thereafter, the surface of the photosensitive drum 1Y reaches the irradiation position of the exposure light L (laser light) emitted from the optical scanning devices 5A and 5B (writing device), and the electrostatic scan corresponding to yellow is performed by the exposure scanning at this position. An electrostatic latent image is formed (this is an exposure process).

Thereafter, the surface of the photosensitive drum 1Y reaches a position facing the developing device 3Y, and the electrostatic latent image is developed at this position to form a yellow toner image (developing process).
Thereafter, the surface of the photosensitive drum 1Y reaches a position facing the intermediate transfer belt 8 and the primary transfer roller 9Y, and the toner image on the photosensitive drum 1Y is transferred onto the intermediate transfer belt 8 at this position ( Primary transfer step). At this time, a small amount of untransferred toner remains on the photosensitive drum 1Y.

Thereafter, the surface of the photosensitive drum 1Y reaches a position facing the cleaning device 2Y, and untransferred toner remaining on the photosensitive drum 1Y at this position is collected in the cleaning device 2Y by the cleaning blade 2a (cleaning). Process.)
Finally, the surface of the photosensitive drum 1Y reaches a position facing a neutralization unit (not shown), and the residual potential on the photosensitive drum 1Y is removed at this position.
Thus, a series of image forming processes performed on the photosensitive drum 1Y is completed.

The image forming process described above is performed in the same manner as the process cartridge 6Y (image forming unit) for yellow with the other process cartridges 6M, 6C, and 6BK (image forming unit). That is, the exposure light L based on the image information is irradiated onto the photosensitive drums of the process cartridges 6M, 6C, and 6BK from the optical scanning devices 5A and 5B disposed above the image forming unit.
Thereafter, the toner images of the respective colors formed on the respective photosensitive drums through the developing process are transferred onto the intermediate transfer belt 8 in an overlapping manner. In this way, a color image is formed on the intermediate transfer belt 8.

  Here, referring to FIG. 1, the intermediate transfer belt device 15 includes an intermediate transfer belt 8, four primary transfer rollers 9Y (see FIG. 2), a driving roller, a driven roller, and the like. The intermediate transfer belt 8 is stretched and supported by a driving roller, a driven roller, and a primary transfer roller, and is endlessly moved in the arrow direction (counterclockwise direction) in FIG. 1 by the rotational driving of the driving roller.

The primary transfer roller 9Y sandwiches the intermediate transfer belt 8 with the photosensitive drum 1Y to form a primary transfer nip. A transfer voltage (transfer bias) opposite to the polarity of the toner is applied to the primary transfer roller 9Y.
The intermediate transfer belt 8 travels in the direction of the arrow and sequentially passes through the primary transfer nip of each primary transfer roller (9Y). In this way, the toner images of the respective colors on the respective photosensitive drums (1Y) are primarily transferred while being superimposed on the intermediate transfer belt 8.

  Thereafter, the intermediate transfer belt 8 on which the toner images of the respective colors are transferred in a superimposed manner reaches a position facing the secondary transfer roller 19. At this position, the drive roller (secondary transfer counter roller) sandwiches the intermediate transfer belt 8 with the secondary transfer roller 19 to form a secondary transfer nip. The four-color toner images formed on the intermediate transfer belt 8 are transferred onto a recording medium P such as transfer paper conveyed to the position of the secondary transfer nip (secondary transfer step). . At this time, untransferred toner that has not been transferred to the recording medium P remains on the intermediate transfer belt 8.

Thereafter, the intermediate transfer belt 8 reaches the position of the intermediate transfer cleaning device 16 (intermediate transfer cleaning blade). At this position, the untransferred toner on the intermediate transfer belt 8 is mechanically removed by an intermediate transfer cleaning blade (intermediate transfer cleaning device 16) that is in pressure contact with the intermediate transfer belt 8. The intermediate transfer cleaning blade is a substantially plate-like member made of an elastic material such as urethane rubber, and is in contact with the intermediate transfer belt 8 with a predetermined contact pressure and contact angle.
Thus, a series of transfer processes performed on the intermediate transfer belt 8 is completed.

Here, referring to FIG. 1, the recording medium P conveyed to the position of the secondary transfer nip is fed from a sheet feeding unit 26 disposed below the apparatus main body 100 to a sheet feeding roller 27 and a registration roller pair 28. (A pair of timing rollers) or the like.
Specifically, a plurality of recording media P such as transfer paper are stored in the paper supply unit 26 in a stacked manner. When the paper feed roller 27 is driven to rotate counterclockwise in FIG. 1, the uppermost recording medium P is fed toward the rollers of the registration roller pair 28.

  The recording medium P transported to the registration roller pair 28 temporarily stops at the position of the roller nip of the registration roller pair 28 whose rotation drive has been stopped. Then, the registration roller pair 28 is rotationally driven in synchronization with the color image on the intermediate transfer belt 8, and the recording medium P is conveyed toward the secondary transfer nip. In this way, a desired color image is transferred onto the recording medium P.

Thereafter, the recording medium P on which the color image is transferred at the position of the secondary transfer nip is conveyed to the position of the fixing device 20 (fixing nip). At this position, the color image (toner image) transferred to the surface is fixed on the recording medium P by heat and pressure generated by the fixing belt 21 (fixing member) and the pressure roller 22 (pressure member). (This is a fixing process.)
Thereafter, the recording medium P is discharged out of the apparatus by a pair of paper discharge rollers. The recording medium P discharged out of the apparatus by the pair of paper discharge rollers is sequentially stacked on the stack unit (main body cover 110) as an output image.
Thus, a series of image forming processes in the image forming apparatus is completed.

Hereinafter, the optical scanning devices 5A and 5B will be described with reference to FIGS.
As described above with reference to FIG. 1, the image forming apparatus 100 according to the present embodiment includes two optical scanning devices (the first optical scanning device 5A and the second optical scanning device 5B). .) Is installed. The first optical scanning device 5A is for performing an exposure process on the photosensitive drum of the black process cartridge 6BK and the photosensitive drum of the cyan process cartridge 6C, respectively. The second optical scanning device 5B is for performing an exposure process on the photosensitive drum of the magenta process cartridge 6M and the photosensitive drum of the yellow process cartridge 6Y, respectively.
Since the two optical scanning devices 5A and 5B (writing device) are configured in substantially the same manner except that the exposure light irradiation target is different as described above, the second optical scanning device 5B will be described below. Only the first optical scanning device 5A will be described by omitting appropriately.

  3 and 4, the optical scanning device 5A (writing device) includes an LD unit 51, an optical deflector 53 (polygon scanner unit), a scanning lens 54 (fθ lens), reflection mirrors 55C, 55BK, 56BK, Optical components such as scanning lenses 57BK and 57C having power in the sub-scanning direction are installed inside the housing 500 (optical housing). Although not shown, the ceiling portion of the housing 500 (optical housing) is covered with a cover member, so that the inside of the optical scanning device 5A becomes a substantially sealed space to prevent the intrusion of dust inside. doing. The LD unit 51 and the optical deflector 53 are installed on the end side of the housing 500 (the left side in FIGS. 3 and 4).

  The LD unit 51 includes a black light source 52BK composed of a semiconductor laser for irradiating the surface of the photosensitive drum of the black process cartridge 6BK with exposure light LBK (scanning light beam), and a cyan process cartridge 6C. And a cyan light source 52C made of a semiconductor laser for irradiating exposure light LC (scanning light) toward the surface of the photosensitive drum. The LD unit 51 is configured so that the light (light beam) emitted from the light source 52BK for black and the light (light beam) emitted from the light source 52C for cyan are irradiated to the same position of the polygon mirror 53a. The light sources 52BK and 52C are mounted and held.

The optical deflector 53 includes a polygon mirror 53a (rotating polygonal mirror) formed in a regular polygonal column, a polygon motor 53b that rotates the polygon mirror 53a, a substrate 53c that holds the polygon mirror 53a and the polygon motor 53b, and the like. Has been. An electronic component (circuit board) for controlling the rotational drive of the polygon motor 53b is also mounted on the board 53c. The polygon mirror 53a has reflecting mirrors formed on its six side surfaces. In the present embodiment, the polygon mirror 53a is formed in a regular hexagonal prism shape, but the shape of the polygon mirror 53a is not limited to this.
In the present embodiment, the optical deflector 53 is fixedly installed on the housing 500 by screw fastening using the bridging member 103, which will be described in detail later.

Then, the optical scanning device 5A configured as described above operates as follows.
First, the light beam emitted from the black light source 52BK fixed to the LD unit 51 is converted into a parallel light beam by the collimator lens 59a disposed on the optical path between the LD unit 51 and the polygon mirror 53a. Then, the light passes through the cylindrical lens 59b, and is condensed in the sub-scanning direction (the direction corresponding to the moving direction (rotating direction) of the photosensitive drum on the surface of the photosensitive drum), and is collected on the polygon mirror 53a. Incident. The light incident on the polygon mirror 53a is deflected in the main scanning direction (the direction corresponding to the rotational axis direction of the photosensitive drum on the surface of the photosensitive drum) while being reflected by the reflecting mirror of the polygon mirror 53a, and thereafter. The moving speed in the deflection direction of the light beam passing through the scanning lens 54 and deflected in the main scanning direction at a constant angular velocity by the polygon mirror 53a is converted to a constant velocity. The light that has passed through the scanning lens 54 is sequentially reflected at the positions of the first reflecting mirror 55BK and the second reflecting mirror 56BK, and then passes through the scanning lens 57BK having power in the sub-scanning direction, and passes through the polygon mirror 53a. Troublesome is corrected. Then, the light that has passed through the scanning lens 57BK passes through a dust-proof glass 58BK provided so as to cover the opening 504BK formed on the bottom surface of the housing 500, and passes through the photosensitive drum of the black process cartridge 6BK. The surface is irradiated (optically scanned).

  The operation until the light emitted from the cyan light source 52C fixed to the LD unit 51 is applied to the surface of the photosensitive drum of the cyan process cartridge 6C is also performed after passing through the scanning lens 54. The procedure is the same as that for black described above except that the optical path (the optical path in which the reflection mirror 55C, the scanning lens 57C, and the dustproof glass 58C (opening 504C) are installed) is different.

The characteristic configuration and operation of the optical scanning devices 5A and 5B in the present embodiment will be described in detail below with reference to FIGS.
As described above with reference to FIGS. 3 and 4, the optical scanning device 5 </ b> A according to the present embodiment includes the optical deflector 53 that deflects the light emitted from the light source 52 </ b> BK and the optical deflector 53. A case 500 is provided. In the optical deflector 53, a polygon mirror 53a is rotatably installed on a substrate 53c.

  Here, referring to FIGS. 5 and 6, in optical scanning device 5 </ b> A in the present embodiment, bridging members 103 are provided at both ends in the longitudinal direction of substrate 53 c of optical deflector 53. The bridging member 103 has one end A fixed to a boss 510 serving as a fixing portion of the casing 500 together with the optical deflector 53 (substrate 53c), and the other end B connected to the boss 510 (fixing section) in the casing 500. ) Is fixed to a different part (the second boss part 511).

Specifically, the boss portion 510 (first boss portion) is formed so as to stand up from the reference surface 500 a (bottom surface) of the housing 500, and functions as a fixing portion that fixes the optical deflector 53 to the housing 500. . Specifically, the bosses 510 (first bosses) are formed at positions corresponding to the four corners of the substrate 53c of the optical deflector 53, respectively.
The bridging member 103 is fastened together with a screw 105 together with the substrate 53c of the optical deflector 53 to the female screw portion formed on the boss portion 510 at one end A, and the other end B is formed on the reference surface 500a of the housing 500. The screw 105 in the female screw portion (in this embodiment, the female screw portion of the second boss portion 511 formed so as to stand up from the reference surface 500a at a height lower than that of the first boss portion 510). It is concluded by Therefore, the optical deflector 53 (substrate 53c) is not held in direct contact with the reference surface 500a (bottom surface) of the casing 500, but is provided with a space between the reference plane 500a and the casing 500. Will be held. Specifically, the bridging member 103 is screwed to the two boss portions 510 (first boss portions) together with the substrate 53c, and the bridging member 103 is screwed to the two second boss portions 511, respectively. Are screwed in a total of four places. In the present embodiment, the bridging member 103 has one end A in surface contact with the substrate 53c, and the other end B in surface contact with only the two second boss portions 511 raised from the reference surface 500a.

  With this configuration, even if the polygon mirror 53a is a high-speed machine that is rotationally driven at a high speed, the optical scanning device 5A can be configured with a relatively simple structure at a relatively low cost without installing an anti-vibration material. The vibration generated in the optical deflector 53 can be sufficiently reduced. Therefore, a problem that a large vibration (resonance) is generated in the optical deflector 53 and a band-shaped density unevenness (banding image) in the main scanning direction is generated in the image formed on the photosensitive drum is surely reduced. It will be.

Hereinafter, such effects in the present invention will be supplementarily described.
First, banding due to vibration during driving of the optical deflector 53 will be described with reference to FIG.
As shown in FIG. 7, if the optical deflector 53 (substrate 53 c) is directly held in the housing 500, the resonance frequency of the housing 500 is excited to coincide with or close to the driving frequency of the optical deflector 53. It becomes easy to vibrate. In such a case, the optical deflector 53 fixed to the housing 500 also vibrates accordingly, and the posture change is repeated at the vibration cycle of the optical deflector 53. Therefore, as shown in FIG. 7A, the incident light K1 is reflected as reflected light K2 at the same angle with respect to a plane perpendicular to the installation surface of the optical deflector 53, whereas 7 (B), since the optical deflector 53 changes its posture in the direction of the double arrow, the reflected light K2 differs from the plane perpendicular to the installation surface of the optical deflector 53 for each reflective surface of the polygon mirror 53a. It will be reflected at an angle. As a result, a banding image is generated by deviating from a desired position on the photosensitive drum.

  On the other hand, in this embodiment, one end side A of the bridging member 103 is fastened together with the optical deflector 53 to the boss portion 510 (fixed portion), and the other end side B of the bridging member 103 is other than the boss portion 510. It is fastened to the part. Therefore, since the bridging member 103 functions as a beam and increases the rigidity of the housing 500, the resonance frequency can be shifted to the high frequency side, and is coincident with or close to the drive frequency of the optical deflector 53. Can be prevented. Therefore, it is possible to reduce a problem that the optical deflector 53 vibrates and a banding image is generated. Further, since the bridging member 103 is connected to the optical deflector 53 that is a vibration source, a large load is applied to the bridging member 103, and the bridging member 103 functions effectively as a beam.

In the present embodiment, the other end B of the bridging member 103 is screwed to the second boss portion 511 of the reference surface 500a. However, the other end B of the bridging member 103 is directly connected to the reference surface 500a. It can also be configured to be screw-fastened. That is, screws can be fastened with the other end B of the bridging member 103 in surface contact with the reference surface 500a.
Even in this case, the same effect as that of the present embodiment can be obtained.

5 and 6, in the present embodiment, a portion of housing 500 where the other end side B of bridging member 103 is fixed (a portion fixed to second boss portion 511). Is formed outside the outer shape of the optical deflector 53 (substrate 53c). That is, when the optical deflector 53 and the bridging member 103 are projected from above, the portion to which the other end B of the bridging member 103 is fixed is outside the range of the optical deflector 53 (substrate 53c) (projection range). Outside).
In many cases, the optical deflector 53 is arranged near a position where the vibration of the housing 500 becomes an antinode. For this reason, the other end B of the bridging member 103 (the portion that does not directly contact the bridging member 103) is located outside the outer shape of the optical deflector 53 (substrate 53c), so that the vibration of the casing 500 is performed. Is connected to a small position, and effectively functions as a member for preventing the bridging member 103 from resonating with vibration of the casing 500.

5 and 6, in the present embodiment, one end side A of bridging member 103 is fixed to boss portion 510 (fixed portion) via optical deflector 53 (substrate 53c). Is formed. That is, the bridging member 103 is disposed between the substrate 53 c and the screw head of the screw 105, and is fastened together with the substrate 53 to the boss portion 510 by the screw 105.
In general, the mounting seat surface (the upper end surface of the boss portion 510) to which the optical deflector 53 is fixed in the housing 500 is set with high accuracy. In the case where the bridging member 103 is formed of a relatively inexpensive galvanized steel plate (SECC) or the like, the mounting seat surface to which the optical deflector 53 is fixed cannot be formed with such a high degree of accuracy. If the member 103 is disposed, the installation accuracy of the optical deflector 53 is lowered, and the latent image formed on the photosensitive drum may be disturbed to deteriorate the image quality.
On the other hand, in this embodiment, since the substrate 53c is directly arranged on the boss portion 510 having a highly accurate mounting seat surface, the installation accuracy of the optical deflector 53 can be kept good. .

5 and 6, in the present embodiment, bridging member 103 is a plate-like member made of a metal material, and at least one bent portion is formed. Specifically, in the present embodiment, the bridging member 103 is obtained by bending a galvanized steel sheet having a plate thickness of about 1 to 3 mm at two locations, and has a step parallel to the reference plane 500a. The two planes and a vertical plane connecting the ends of the planes are formed in a substantially Z shape.
With this configuration, the rigidity of the bridging member 103 can be increased, the bridging member 103 effectively functions as a beam, and the optical deflector 53 is less likely to resonate with the vibration of the casing 500.

As described above, the optical scanning devices 5A and 5B in the present embodiment include the optical deflector 53 that deflects the light emitted from the light sources 52BK and 52C, and the housing 500 in which the optical deflector 53 is installed. , Is provided. One end A is fixed to the boss portion 510 (fixed portion) of the housing 500 together with the optical deflector 53, and the other end B is fixed to a portion of the housing 500 different from the boss portion 510 (fixed portion). A bridging member 103 is further provided.
Thereby, vibration generated in the optical deflector 53 can be further reduced with a relatively simple configuration at a relatively low cost.

In the present embodiment, the present invention is applied to the optical scanning devices 5A and 5B installed in the color image forming apparatus 100. However, the present invention is also applied to the optical scanning device installed in the monochrome image forming apparatus. Of course, the present invention can be applied.
In the present embodiment, the present invention is applied to the optical scanning devices 5A and 5B in which the optical paths of the two exposure lights L corresponding to the two colors are formed. Naturally, the present invention can also be applied to an optical scanning device in which the optical path of the exposure light is formed.
Even in these cases, the same effects as those of the present embodiment can be obtained.

  It should be noted that the present invention is not limited to the present embodiment, and it is obvious that the present embodiment can be modified as appropriate within the scope of the technical idea of the present invention, other than suggested in the present embodiment. is there. In addition, the number, position, shape, and the like of the constituent members are not limited to the present embodiment, and the number, position, shape, and the like suitable for implementing the present invention can be achieved.

1Y photosensitive drum (image carrier),
5A, 5B optical scanning device (writing device),
53 Optical deflector,
53a Polygon mirror,
53b Polygon motor,
53c substrate,
103 cross-linking member,
105 screws,
500 housing (optical housing),
500a Reference plane,
510 boss (fixed part),
511 second boss part,
100 Image forming apparatus (image forming apparatus main body).

JP 2002-98926 A

Claims (6)

An optical deflector for deflecting the light emitted from the light source;
A housing in which the optical deflector is installed;
One end side is fixed together with the optical deflector to the fixing portion of the casing, and the other end side is fixed to a portion different from the fixing section in the casing;
Bei to give a,
The light deflector is a polygon mirror rotatably installed on a substrate,
In a state where the substrate of the optical deflector is sandwiched between the one end side of the bridging member and the fixing portion, the substrate and the one end side of the bridging member are fastened to the fixing portion. An optical scanning device characterized by that .   2. The optical scanning device according to claim 1, wherein a portion of the housing to which the other end side of the bridging member is fixed is formed outside the outer shape of the optical deflector.   The optical scanning device according to claim 1, wherein the one end side of the bridging member is formed to be fixed to the fixing portion via the optical deflector.   4. The optical scanning device according to claim 1, wherein the bridging member is a plate-like member made of a metal material, and at least one bent portion is formed. 5. The fixed portion is a boss portion that stands up from a reference surface of the housing,
The bridging member is a female screw part, in which the one end side is fastened together with a screw together with the substrate of the optical deflector to the female screw part formed on the boss part, and the other end side is formed on the reference surface of the casing. The optical scanning device according to claim 1, wherein the optical scanning device is fastened to the screw portion with a screw.   An image forming apparatus comprising the optical scanning device according to claim 1.

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