JP6410049B2 - Optical scanning device and image forming apparatus including the optical scanning device - Google Patents

Description

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

  2. Description of the Related Art Conventionally, there is known an optical scanning device that is mounted on an electrophotographic image forming apparatus and scans a surface of a photosensitive drum with a light beam corresponding to image data (for example, see Patent Document 1). The optical scanning device includes a light source, a rotating polygon mirror that reflects and scans a light beam emitted from the light source, an optical box that houses the light source and the rotating polygon mirror, and a lid member that closes the ceiling side of the optical box. And. The lid member has a light passage opening through which the light beam can pass. In addition to the light source and the rotary polygon mirror, a first scanning lens and a first reflection mirror are provided on the bottom wall of the optical box. The first reflecting mirror reflects the light beam reflected by the rotary polygon mirror toward the ceiling side (lid member side) from the rotary polygon mirror. In the vicinity of the lid member in the optical box, an optical element that guides the light beam reflected by the first reflecting mirror to the member to be scanned through the light passage opening (second scanning lens, second reflecting mirror). And a third reflecting mirror). Each optical element has a shape that is long in the main scanning direction, and is disposed closer to the ceiling than the rotary polygon mirror. Both ends of each optical element in the main scanning direction are supported by support columns extending from the bottom wall portion of the optical box toward the ceiling.

JP 2011-51128 A

  However, in the optical scanning device shown in Patent Document 1, an optical element (an optical element that guides the light beam reflected by the first reflecting mirror to the member to be scanned) disposed on the ceiling side of the rotary polygon mirror is optically used. Since it is supported by the support pillar extending from the bottom wall portion of the box to the ceiling side, there is a problem that it is difficult to ensure the support rigidity of the optical element. If the support rigidity of the optical element is low, the optical element easily vibrates due to the rotational vibration of the rotary polygon mirror, etc., and the light beam irradiation accuracy on the photosensitive drum by the optical scanning device decreases, and as a result, the printed image The image quality will be degraded.

  On the other hand, it is conceivable to arrange the optical element so as not to overlap the first scanning lens on the bottom wall portion of the optical box. Thereby, since the optical element can be directly supported on the bottom wall portion of the optical box, the vibration of the optical element can be suppressed as compared with the case where the optical element is supported by the support column. However, in this case, it is necessary to make the area of the bottom wall portion of the optical box as large as the arrangement space of the optical elements, and there is a problem that the installation area of the optical scanning device increases.

  The present invention has been made in view of the above points, and the object of the present invention is to avoid an increase in the installation area of the optical scanning device, while the optical element disposed on the ceiling side of the rotary polygon mirror is, The object is to prevent vibration due to rotational vibration of the rotary polygon mirror.

An image forming apparatus according to the present invention includes a bottomed optical box whose ceiling side is open, a lid member that is disposed so as to cover the ceiling side of the optical box and has a light passage opening, and is disposed in the optical box. A light source that emits a light beam, a rotating polygon mirror that is supported by the bottom wall of the optical box and reflects and deflects and scans the light beam emitted from the light source, and is deflected and scanned by the rotating polygon mirror. A reflection mirror that reflects the light beam toward the ceiling side with respect to the rotary polygon mirror, and a light beam that is disposed on the ceiling side with respect to the rotary polygon mirror and reflected by the reflection mirror passes through the light passage opening. And an optical element guided to the member to be scanned, the optical element being supported by the lid member, and the lid member being divided into a lid portion that supports the optical element and a lid portion that does not support the optical element. Has been.

  ADVANTAGE OF THE INVENTION According to this invention, it can prevent that the optical element arrange | positioned on the ceiling side rather than a rotary polygon mirror vibrates by the rotational vibration of a rotary polygon mirror, avoiding the increase in the installation area of an optical scanning device. .

FIG. 1 is a schematic diagram illustrating an internal structure of an image forming apparatus including an optical scanning device according to an embodiment. FIG. 2 is a plan view showing a state in which the lid member of the optical scanning device is removed. 3 is a view in the direction of the arrow III in FIG. FIG. 4 is a plan view showing a state in which the lid member is attached to the optical scanning device. FIG. 5 is an enlarged side view of the support portion of the second reflecting mirror viewed from the main scanning direction. 6 is a view in the direction of the arrow VI in FIG. FIG. 7 is an enlarged side view of the support portion of the third reflecting mirror viewed from the main scanning direction. FIG. 8 is a side view of the second scanning lens as viewed from the main scanning direction in an enlarged manner. 9 is a view taken in the direction of the arrow IX in FIG. FIG. 10 is a view corresponding to FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following embodiment.

Embodiment 1
FIG. 1 is a cross-sectional view showing a schematic configuration of a laser printer 1 as an image forming apparatus in the present embodiment.

  As shown in FIG. 1, the laser printer 1 includes a box-shaped printer main body 2, a manual paper feed unit 6, a cassette paper feed unit 7, an image forming unit 8, a fixing unit 9, and a paper discharge unit 10. It has. Thus, the laser printer 1 is configured to form an image on a sheet based on image data transmitted from a terminal or the like (not shown) while conveying the sheet along a conveyance path L in the printer body 2. ing.

  The manual paper feed unit 6 includes a manual feed tray 4 that can be opened and closed on one side of the printer main body 2, and a manual paper feed roller 5 that is rotatably provided inside the printer main body 2. ing.

  The cassette paper feeding unit 7 is provided at the bottom of the printer main body 2. The cassette paper feed unit 7 separates the paper feed cassette 11 that stores a plurality of papers stacked on each other, a pick roller 12 that takes out the paper in the paper feed cassette 11 one by one, and the paper that is taken out one by one. The feed roller 13 and the retard roller 14 are fed to the transport path L.

  The image forming unit 8 is provided above the cassette paper feeding unit 7 in the print main body 2. The image forming unit 8 includes a photosensitive drum 16 which is an image carrier rotatably provided in the printer main body 2, a charger 17 disposed around the photosensitive drum 16, a developing unit 18, a transfer roller 19, and A cleaning unit 20, an optical scanning device 30 disposed above the photosensitive drum 16, and a toner hopper 21 are provided. Thus, the image forming unit 8 forms an image on the sheet supplied from the manual sheet feeding unit 6 or the cassette sheet feeding unit 7. The transport path L is provided with a pair of registration rollers 15 that supply the fed sheet to the image forming unit 8 at a predetermined timing after temporarily waiting.

  The fixing unit 9 is disposed on the side of the image forming unit 8. The fixing unit 9 includes a fixing roller 22 and a pressure roller 23 that are pressed against each other and rotate. Thus, the fixing unit 9 is configured to fix the toner image transferred to the sheet by the image forming unit 8 on the sheet.

  The paper discharge unit 10 is provided above the fixing unit 9. The paper discharge unit 10 includes a paper discharge tray 3, a pair of paper discharge rollers 24 for conveying paper to the paper discharge tray 3, and a plurality of conveyance guide ribs 25 for guiding paper to the paper discharge roller pair 24. Yes. The paper discharge tray 3 is formed in a concave shape at the top of the printer body 2.

  When the laser printer 1 receives the image data, the photosensitive drum 16 is rotationally driven in the image forming unit 8, and the charger 17 charges the surface of the photosensitive drum 16.

  Then, based on the image data, a light beam is emitted from the optical scanning device 30 to the photosensitive drum 16. An electrostatic latent image is formed on the surface of the photosensitive drum 16 by irradiation with a light beam. The electrostatic latent image formed on the photosensitive drum 16 is developed by the developing unit 18 to become a visible image as a toner image.

  Thereafter, the sheet passes between the transfer roller 19 and the photosensitive drum 16. At that time, the toner image on the photosensitive drum 16 is transferred onto the sheet by the transfer bias applied to the transfer roller 19. The sheet on which the toner image is transferred is heated and pressed by the fixing roller 23 and the pressure roller 24 in the fixing unit 9. As a result, the toner image is fixed on the paper.

  As shown in FIGS. 2 and 3, the optical scanning device 30 includes a bottomed optical box 31 that opens on the ceiling side, and a lid member 32 that covers the ceiling side of the optical box 31.

  A buffer member 46 is provided between the lid member 32 and the optical box 31. The buffer member 46 is formed in a rectangular frame shape so as to extend along the end surface of the side wall of the optical box 31 on the ceiling side. The buffer member 46 is made of, for example, an elastic material including a foamed material such as urethane foam or an elastic resin such as rubber. The buffer member 46 has a function of absorbing rotational vibration of the polygon mirror 34 and preventing the rotational vibration from being transmitted to the lid member 32. The buffer member 46 may be fixed to the lid member 32, may be fixed to the optical box 31, or may not be fixed to both the lid member 32 and the optical box 31. .

  A light source 33 and a polygon mirror 34 are accommodated in the optical box 31. The light source 33 is fixed to a pedestal 31 a that protrudes from the bottom wall of the optical box 31. The light source 33 is a laser light source having a laser diode, for example. An incident mirror 37 is provided in the optical path from the light source 33 to the polygon mirror 34. The incident mirror 37 reflects the light beam emitted from the light source 33 and makes it incident on the reflecting surface of the polygon mirror 34. A collimator lens 41 and a cylinder lens 42 are disposed between the light source 33 and the incident mirror 37.

  The polygon mirror 34 is rotationally driven by a polygon motor 45 as shown in FIG. The polygon motor 45 is installed on the bottom wall portion of the optical box 31. A first scanning lens 35 is installed on the side of the polygon mirror 34 on the bottom wall of the optical box 31. The first scanning lens 35 is bonded and fixed to a pedestal portion 31 b protruding from the bottom wall portion of the optical box 31. A first reflecting mirror 38 is disposed on the bottom wall portion of the optical box 31 on the side opposite to the polygon mirror 34 side of the first scanning lens 35. The first reflecting mirror 38 has a long shape that is long in the main scanning direction. The first reflecting mirror 38 is fixed to a pedestal portion 31 c protruding from the bottom wall portion of the optical box 31.

  An optical element that guides the light beam reflected by the first reflecting mirror 38 to the photosensitive drum 16 as the member to be scanned is provided through the light passage opening 32a in the vicinity of the lid member 32 in the optical box 31. ing. In the present embodiment, a second reflection mirror 39, a second scanning lens 36, and a third reflection mirror 40 are provided as optical elements.

  The second reflection mirror 39 is disposed on the upper side (ceiling side) of the first reflection mirror 38. The third reflection mirror 40 is disposed on the side of the second reflection mirror 39 and on the upper side (ceiling side) of the polygon mirror 34. A rectangular light passage opening 32a (see FIG. 4) extending in the main scanning direction is formed in a portion of the lid member 32 facing the third reflection mirror 40. And the reflected light of the 3rd reflective mirror 40 radiate | emits the exterior of the optical box 31 through the light passage opening 32a. The second scanning lens 36 is disposed between the second reflection mirror 39 and the third reflection mirror 40. The second reflecting mirror 39, the third reflecting mirror 40, and the second scanning lens 36 all have a long shape that is long in the main scanning direction.

  In the optical scanning device 30 configured as described above, the light emitted from the light source 32 passes through the collimator lens 41 (see FIG. 2) and the cylinder lens 42 and is then reflected by the incident mirror 37 to be reflected by the polygon mirror 34. Focused on the reflecting surface. The light beam condensed on the polygon mirror 34 is deflected and scanned by the reflection surface of the polygon mirror 34 and enters the first scanning lens 35. The light beam that has passed through the first scanning lens 35 is reflected by the first reflecting mirror 38 toward the ceiling side rather than the polygon mirror 34. The light beam reflected by the first reflecting mirror 38 is reflected by the second reflecting mirror 39, passes through the second scanning lens 36, is then reflected by the third reflecting mirror 40, and passes through the light passage opening 32a to the photosensitive drum. 16 leads to. Thus, the light beam forms an image on the surface of the photosensitive drum 16. The light beam imaged on the surface of the photosensitive drum 16 scans the surface of the photosensitive drum 16 in the main scanning direction by the rotation of the polygon mirror 34, and scans in the sub-scanning direction by the rotation of the photosensitive drum 16. An electrostatic latent image is formed on the surface.

  As shown in FIG. 3, the second reflection mirror 39 is supported on the lid member 32 by the mirror support portion S1, the third reflection mirror 40 is supported on the lid member 32 by the mirror support portion S2, and the second scanning lens 36 is It is supported on the lid member 32 by the lens support portion S3. As shown in FIG. 4, the mirror support part S1, the mirror support part S2, and the lens support part S3 are respectively intermediate parts in the main scanning direction of the second reflection mirror 39, the third reflection mirror 40, and the second scanning lens 36 ( In this embodiment, for example, the central portion is supported.

  As shown in FIG. 5, the mirror support portion S <b> 1 that supports the second reflection mirror 39 includes a support plate portion 60, an opposing wall portion 61, and a connecting wall portion 62. The support plate portion 60 is connected to a surface of the lid member 32 facing the optical box 31 at a predetermined angle when viewed from the main scanning direction. The support plate portion 60 may be formed integrally with the lid member 32 or may be formed of a member different from the lid member 32. The facing wall portion 61 faces the facing wall portion 61 at an end portion of the support plate portion 60 opposite to the lid member 32 side. The opposing wall portion 61 is formed in a rectangular plate shape that extends in the main scanning direction. An end edge on the bottom wall portion side of the optical box 31 in the support plate portion 60 and an end edge on the bottom wall portion side in the opposing wall portion 61 are connected via a connecting wall portion 62.

  The central portion of the second reflecting mirror 39 in the main scanning direction is held by a rectangular block-shaped holder 81 (see FIGS. 5 and 6). A groove 81 a extending in the main scanning direction is formed on one side surface of the holder 81 in the thickness direction. The second reflecting mirror 39 is fitted and fixed to the groove 81a. One of the two edge portions extending in the main scanning direction of the holder 81 is inserted into a recess 63 (see FIG. 5) formed by the support plate portion 60, the opposing wall portion 61, and the connecting wall portion 72. Yes. A leaf spring 101 having a U-shaped cross section is inserted in a compressed state between one side surface in the thickness direction of the holder 81 and the opposing wall portion 61. The holder 81 is constantly urged toward the support plate 60 by the urging force of the leaf spring 101. Two screw holes 81b (only one screw hole 81b is shown in FIG. 5) are formed at the end of the holder 81 on the lid member 32 side so as to be spaced apart in the main scanning direction. An adjusting bolt 91 is screwed into each of the two screw holes 81b. The tip of the adjusting bolt 91 is formed in a hemispherical shape and abuts on the support plate 60. By rotating the adjustment bolt 91 with a screwdriver or the like, the attachment angle of the holder 81 with respect to the support plate portion 60 can be adjusted, and consequently the attachment angle of the second reflection mirror 39 with respect to the support plate portion 60 can be adjusted.

  Since the basic configuration of the mirror support portion S2 that supports the third reflection mirror 40 is the same as that of the mirror support portion S1, the following description will be briefly given. That is, the mirror support portion S2 includes a support plate portion 70, an opposing wall portion 71, and a connecting wall portion 72, as shown in FIG. The third reflecting mirror 40 is fitted and bonded to a groove 82 a formed in the holder 82. One of the two edge portions extending in the main scanning direction of the holder 82 is inserted into a recess 74 formed by the support plate portion 70, the opposing wall portion 71, and the connecting wall portion 72. A leaf spring 102 having a U-shaped cross section is inserted between the holder 82 and the opposing wall portion 71 in a compressed state. The holder 82 is formed with two screw holes 82b (only one screw hole 82b is shown in FIG. 7) arranged at intervals in the main scanning direction. An adjusting bolt 92 is screwed into each of the two screw holes 82b. The tip of the adjustment bolt 92 is in contact with the support plate portion 73, and the adjustment angle of the third reflection mirror 40 with respect to the support plate portion 73 can be adjusted by rotating the adjustment bolt 92 with a screwdriver or the like.

  As shown in FIG. 8, the lens support portion S <b> 3 that supports the second scanning lens 36 has a support plate portion 50. The support plate portion 50 is connected to the surface of the lid member 32 facing the optical box 31 at a predetermined angle when viewed from the main scanning direction. The support plate part 50 may be formed integrally with the lid member 32, or may be formed of a member different from the lid member 32. The second scanning lens 36 is supported on the support plate part 50 via the holder 80. The holder 80 has a block plate-like holder main body 80a extending in the main scanning direction and an inclined plate portion 80b connected to the holder main body 80a at a predetermined angle when viewed from the main scanning direction. The end of the support plate 50 opposite to the lid member 32 is inserted between the holder body 80a and the inclined plate 80b. A leaf spring 100 having a V-shaped cross section is inserted between the end of the support plate 50 and the holder body 80a in a compressed state.

  The second scanning lens 36 is bonded and fixed to the end surface of the holder body 80a opposite to the lid member 32 side. A pair of protruding boss portions 36a (see FIGS. 8 and 9) arranged at intervals in the main scanning direction are formed on the contact surface of the second scanning lens 36 with the holder 80a. The pair of protruding boss portions 36a are fitted into positioning holes 80c formed in the lens fixing surface of the holder main body 80a to position the second scanning lens 36. A pair of through-holes 80d are formed at the end of the holder body 80a on the lid member 32 side so as to be arranged at intervals in the main scanning direction. An adjusting bolt 90 is inserted through each through hole 80d. The tip of each adjustment bolt 90 is screwed into a screw hole 50 a formed in the support plate 50. By rotating the adjusting bolt 90 with a screwdriver or the like, the mounting angle of the holder 80 with respect to the support plate portion 50 can be adjusted, and by extension, the mounting angle of the second scanning lens 36 with respect to the support plate portion 50 can be adjusted. .

  As described above, in the optical scanning device 30 of the present embodiment, the three optical elements (the second reflection mirror 39, the third reflection mirror 40, and the second scanning lens 36) provided on the ceiling side with respect to the polygon mirror 34. Is supported by the lid member 32. Therefore, it is not necessary to support each optical element by the support pillar extending from the bottom wall portion of the optical box 31 to the ceiling side. Therefore, it is possible to avoid a decrease in the support rigidity of each optical element due to the bending deformation of the support column. Thus, by ensuring sufficient support rigidity of each optical element, it is possible to suppress the vibration of each optical element due to the rotational vibration of the polygon mirror 34. The lid member 32 that supports the three optical elements is configured separately from the optical box 31 in which the polygon mirror 34 that is a vibration source is installed. Therefore, as compared with the case where the three optical elements are arranged on the bottom wall portion of the optical box 31, the rotational vibration of the polygon mirror 34 is not easily transmitted to the optical element, and the area of the bottom wall portion of the optical box 31 is reduced. Can be made as small as possible.

  Further, in the conventional optical scanning device 30, in order to prevent the optical path from being blocked by the support pillars extending from the bottom wall portion of the optical box 31 to the ceiling side, both ends of each optical element in the main scanning direction by the pair of support pillars. The part is supported. For this reason, there is a problem in that the optical performance of the optical scanning device 30 is deteriorated by bending deformation at the intermediate portion in the main scanning direction of each optical element. In addition, since it is necessary to dispose support pillars near both ends of each optical element, there is a problem that the size of the optical box 31 in the main scanning direction is increased.

  On the other hand, in this embodiment, each optical element is supported by the lid member 32 via each mirror support part S1-S3. Therefore, the intermediate portions in the main scanning direction of the optical elements can be supported without blocking the optical path by the mirror support portions S1 to S3. As a result, the above-described problem of bending deformation of the intermediate portion of the optical element and the problem of increase in the size of the optical box 31 in the main scanning direction can be solved simultaneously.

  In addition, since the buffer member 46 is provided between the optical box 31 and the lid member 32, the rotational vibration of the polygon mirror 34 is transmitted to the lid member 32 via the bottom wall portion and the side wall portion of the optical box 31. Can be reliably suppressed.

  In the present embodiment, the surface of the lid member 32 that faces the optical box 31 supports the three optical elements (second scanning lens 36, second reflecting mirror 39, and third reflecting mirror 40). 50, the support plate part 60, and the support plate part 70 are connected. The optical scanning device 30 includes position adjusting means (adjustment bolts 90 to 92, etc.) for adjusting the mounting angle of each optical element with respect to each support plate 50, the support plate 60, and the support plate 70. Yes. Therefore, even if the positioning accuracy of the lid member 32 with respect to the optical box 31 is lowered by providing the buffer member 46 between the optical box 31 and the lid member 32, the mounting angle of each optical element supported by the lid member 32 is changed. By adjusting the position adjustment means, it is possible to suppress deterioration in image quality of the print image of the laser printer 1.

<< Embodiment 2 >>
FIG. 10 shows the second embodiment. In the present embodiment, the configuration of the lid member 32 is different from that of the first embodiment. In addition, since structures other than the cover member 32 are the same as that of Embodiment 1, detailed description is abbreviate | omitted about the same component as Embodiment 1. FIG.

  That is, in the present embodiment, the lid member 32 is divided into a one-side divided portion 321 located on one side in the main scanning direction and an other-side divided portion 322 located on the other side in the main scanning direction. The one-side divided portion includes a rectangular plate portion 321a and first to third rectangular plate portions 321b to 321d protruding in a comb shape from the other side edge of the rectangular plate portion 321a toward the other side. Have. The first to third rectangular plate portions 321b to 321d are arranged at intervals in the direction orthogonal to the main scanning direction. A support plate portion 70 that supports the third reflection mirror 40 is connected to the first rectangular plate portion 321b, and a support plate portion 50 that supports the second scanning lens 36 is connected to the second rectangular plate portion 321c. A support plate portion 60 that supports the second reflection mirror 39 is connected to the third rectangular plate portion 321d.

  The other-side divided portion 322 includes a rectangular plate portion 322a, and first to third rectangular plate portions 322b to 322d that protrude in a comb shape from one side edge of the rectangular plate portion 322a toward the one side. have. The first to third rectangular plate portions 322b to 322d are arranged at intervals in the direction orthogonal to the main scanning direction. The first rectangular plate portion 322b is located on the ceiling side of the third reflection mirror 40, the second rectangular plate portion 322c is located on the ceiling side of the second scanning lens 36, and the third rectangular plate portion 322d is the second reflection mirror. 39 is located on the ceiling side.

  As described above, in the optical scanning device 30 of the present embodiment, the lid member 32 is divided into one side to support the three optical elements (second scanning lens 36, second reflection mirror 39, and third reflection mirror 40). It is divided into a part 321 and an other-side divided part 322 that does not support these three optical elements. Therefore, the user can easily adjust the attachment angles of the three optical elements supported by the one-side divided portion 321 by removing the other-side divided portion 322 from the optical box 31.

<< Other embodiments >>
In the above embodiment, the example in which the optical scanning device 30 is mounted on the laser printer 1 has been described. However, the present invention is not limited to this. That is, the optical scanning device 30 may be mounted on a projector, a barcode reader, a laser microscope, or the like.

  In the above embodiment, a laser printer has been described as an example of an image forming apparatus. However, the present invention is not limited to this, and the image forming apparatus may be a copying machine, a multifunction machine, or the like.

  As described above, the present invention is useful for an optical scanning device and an image forming apparatus including the optical scanning device.

S1 Mirror support part S2 Mirror support part S3 Lens support part 1 Laser printer (image forming apparatus)
16 Photosensitive drum (scanned member)
30 optical scanning device 31 optical box 32 lid member 32a light passage opening 33 light source
34 Polygon mirror (rotating polygon mirror)
38 First reflection mirror (reflection mirror)
39 Second reflection mirror (optical element)
40 Third reflection mirror (optical element)
46 Buffer member 50 Support plate portion 60 Support plate portion 70 Support plate portion 90 Adjustment bolt (position adjusting means)
91 Adjustment bolt (position adjustment means)
92 Adjustment bolt (position adjustment means)
321 One side division (lid)
322 Other side division part (lid part)

Claims (6)

A bottomed optical box with an open ceiling,
A lid member arranged to cover the ceiling side of the optical box and having a light passage opening;
A light source disposed in the optical box and emitting a light beam;
A rotating polygon mirror that is supported on the bottom wall of the optical box and reflects and deflects and scans the light beam emitted from the light source;
A reflection mirror that reflects the light beam deflected and scanned by the rotary polygon mirror toward the ceiling side of the rotary polygon mirror;
An optical element disposed on the ceiling side of the rotary polygon mirror and guiding the light beam reflected by the reflection mirror to the scanned member via the light passage opening;
The optical element is supported by the lid member ,
The optical scanning device, wherein the lid member is divided into a lid portion that supports the optical element and a lid portion that does not support the optical element . The optical scanning device according to claim 1,
An optical scanning device, wherein a buffer member is provided between the optical box and the lid member. The optical scanning device according to claim 1 or 2 ,
An optical scanning device, wherein a surface of the lid member facing the inside of the optical box is formed with a support plate portion that extends from the surface toward the bottom wall portion of the optical box and supports the optical element. The optical scanning device according to claim 3 .
An optical scanning device further comprising position adjusting means for adjusting an attachment angle of the optical element with respect to the support plate. In the optical scanning device according to any one of claims 1 to 4 ,
The optical element extends in the main scanning direction of the light reflected by the rotary polygon mirror,
An optical scanning device, wherein an intermediate portion in the main scanning direction of the optical element is supported by the lid member. An image forming apparatus including an optical scanning device according to any one of claims 1 to 5.

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