JP5146832B2 - Optical scanning apparatus and image forming apparatus - Google Patents

Description

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

  Some image forming apparatuses such as copiers, printers, facsimiles, and the like form a latent image on a latent image carrier by irradiating the latent image carrier with writing light according to image information by deflecting scanning. An image obtained by developing this latent image is known (for example, Patent Document 1). An optical scanning apparatus that deflects and scans writing light is generally a rotating polygon mirror in which light emitted from a light source such as a laser diode (LD) is shaped into a predetermined shape by a collimating lens or aperture attached to an optical housing. Incident on a polygonal mirror. The light incident on the polygon mirror is deflected and scanned by a polygon scanner, which is a deflection scanning means including the polygon mirror, and is irradiated onto the latent image carrier through an optical system component such as an imaging lens. A light source, an aperture, a polygon scanner, and the like are housed in an optical housing. Then, the optical scanning device is sealed by covering the optical housing with a cover member or the like so that dust and dust do not adhere to optical system components such as the imaging lens. The light source, the aperture, the polygon scanner, and the like are attached to the base base of the optical housing.

  In recent years, polygon mirrors have been rotated at a high speed of 40000 to 50000 [rpm] in response to demands for higher image forming speed and higher pixel density. For this reason, a polygon motor bearing for rotating the polygon mirror at high speed generates heat. Further, when the polygon motor is driven, the electronic control component on the drive board for driving and controlling the polygon motor also generates heat. Since the inside of the optical scanning device is hermetically sealed with a cover member, the heat generated by the polygon motor and the driving substrate is transferred to the inside of the optical scanning device, and the inside becomes high temperature. When the temperature inside the optical scanning device becomes high, there is a possibility that optical parts such as an aperture are thermally deformed. If the components of the optical system are thermally deformed, there is a risk that light cannot be imaged on the surface of the latent image carrier. Further, in the case of a color image forming apparatus, the irradiation position on the surface of each latent image carrier is shifted, resulting in a color shift.

Therefore, conventionally, the optical housing is composed of a member having high thermal conductivity such as aluminum. Thereby, the base stand which is a part of the optical housing to which the polygon scanner and the driving substrate are attached becomes a material having high thermal conductivity. As a result, heat generated from the polygon scanner is conducted to the base table, and heat can be released from the base table to the outside of the optical scanning device. As described above, heat generated from the polygon motor and the driving substrate can be released to the outside, so that temperature rise in the optical scanning device can be suppressed, and thermal deformation of the optical system components can be suppressed.
JP 2008-102291 A

  However, in addition to the polygon scanner, an aperture or the like is attached to the base base of the optical housing. As a result, heat from the polygon scanner or the like conducted to the base table is conducted from the base table to the aperture, and the aperture is heated. Since the aperture is made of resin, it is easily deformed under the influence of heat. For this reason, the aperture is thermally deformed by the heat conducted from the base, and the shape of the slit for forming light into a predetermined shape changes. As a result, the light that has passed through the aperture cannot be formed into a target shape. In particular, as described in Patent Document 1, when the aperture is directly fixed to the base table, heat is directly transferred from the base table to the aperture, and the aperture is heated early. As a result, the aperture is thermally deformed at an early stage.

  The present invention has been made in view of the above problems, and an object thereof is to provide an optical scanning device and an image forming apparatus capable of suppressing deformation due to the thermal influence of an aperture.

To achieve the above object, the invention of claim 1 houses a light source, an aperture for shaping a light beam emitted from the light source into a target shape, and a deflection scanning means for deflecting and scanning the light beam. has an optical housing, an optical scanning device for optically scanning a scanning object by the light beam emitted from the light source, the optical housing includes a base stand before Symbol deflection scanning means is fixed, provided on the base stand on And an aperture mounting surface to which the aperture is mounted, and the height of the aperture mounting surface from the base table is higher than the height of the optical path from the base table.
According to a second aspect of the present invention, in the optical scanning device according to the first aspect, the aperture mounting surface is a surface having a flatness obtained by secondary processing.
According to a third aspect of the present invention, in the optical scanning device according to the second aspect, the aperture extends perpendicularly from the slit surface on which the slit is formed, contacts the aperture mounting surface, and the aperture mounting And a flange surface fixed to the aperture fixing portion on which the surface is formed.
According to a fourth aspect of the present invention, in the optical scanning device of the third aspect, a guide hole is provided in the flange surface, and a guide pin that engages with the guide hole is provided in the aperture fixing portion. Is.
According to a fifth aspect of the present invention, in the optical scanning device according to any one of the first to fourth aspects, the aperture fixing portion is provided at a position not facing the slit of the aperture.
According to a sixth aspect of the present invention, in the optical scanning device according to any of the first to fifth aspects, the housing is made of aluminum.
According to a seventh aspect of the present invention, in the optical scanning device according to any one of the first to sixth aspects, a multi-beam light source unit that includes a plurality of the light sources and emits a plurality of light beams is used. .
The invention according to claim 8 is a latent image carrier that carries a latent image, optical scanning means that forms a latent image on the surface of the latent image carrier by optical scanning, and a latent image carrier that carries the latent image. An image forming apparatus including a developing unit that develops a latent image uses the optical scanning device according to claim 1 as the optical scanning unit.

  According to the present invention, since the height of the aperture mounting surface from the base table is higher than the height of the optical path from the base table, the height of the aperture mounting surface from the base table is the same as the height of the optical path from the base table. The distance from the base stand to the aperture mounting surface can be increased compared to a lower one. As a result, the heat conduction distance from the base table to the mounting surface can be made longer than the height of the aperture mounting surface from the base table being lower than the height of the optical path from the base table. As a result, the amount of heat radiation in the process of heat conduction from the base base to the mounting surface can be increased compared to the height of the aperture mounting surface from the base base lower than the height from the base base of the optical path, The amount of heat conducted to the aperture mounting surface can be reduced. As a result, the temperature rise of the aperture mounting surface can be suppressed, and the amount of heat conducted from the aperture mounting surface to the aperture can be reduced. Therefore, the temperature rise of the aperture can be suppressed. As a result, it is possible to suppress thermal deformation of the aperture, and light that has passed through the aperture over time can be formed into a target shape.

Hereinafter, embodiments of an image forming apparatus and an optical scanning apparatus to which the present invention is applied will be described.
FIG. 1 is a schematic configuration diagram illustrating an image forming apparatus according to an embodiment. This image forming apparatus forms a toner image by a known electrophotographic process. A charging device 51, a developing device 52, a transfer roller 53, a cleaning device 54, and the like are provided around a drum-shaped photoconductor 50 serving as a latent image carrier. The photoreceptor 50 has an organic photosensitive layer coated on the surface, and is driven to rotate clockwise in the drawing in the dark. Then, the charging device 51 uniformly charges the surface. The surface of the photoreceptor 50 after the uniform charging is optically scanned by the optical scanning device 1 to carry an electrostatic latent image. This electrostatic latent image is developed into a toner image by a developing device 52 that employs a well-known one-component development method or two-component development method.

  The transfer roller 53 is in contact with the surface of the photoconductor 50 to form a transfer nip. In the transfer nip, a transfer electric field is formed between the transfer roller 53 and the image portion of the photoreceptor 50 by applying a transfer bias to the transfer roller 53.

  A paper feed cassette 55 that accommodates a plurality of recording sheets P in a bundle of sheets is attached to and detached from the housing of the image forming apparatus. The recording paper P in the paper feed cassette 55 is sent out one by one to the paper feed path by the rotational drive of the paper feed roller 55a. Then, the sheet is sandwiched between the registration nips of the registration roller pair 56 disposed near the end of the sheet feeding path.

  The registration roller pair 56 sends the recording paper P sandwiched in the registration nip toward the transfer nip described above at a timing at which the recording paper P can be superimposed on the toner image on the photoconductor 50. The toner image on the photoconductor 50 is electrostatically transferred to the recording paper P sandwiched between the transfer nips by the action of a transfer electric field or nip pressure. The recording paper P onto which the toner image has been transferred in this manner is subjected to fixing processing of the toner image on the surface by the fixing device 57, and then discharged onto a stack tray 59 outside the apparatus through a pair of paper discharge rollers 58. Is done.

  Untransferred toner that has not been transferred to the recording paper P adheres to the surface of the photoreceptor 50 after passing through the transfer nip. This transfer residual toner is removed from the surface of the photoreceptor 50 by the cleaning device 54. Thereafter, the surface of the photoconductor 50 is neutralized by a neutralizing lamp (not shown) and then uniformly charged by the charging device 51.

FIG. 2 is a configuration diagram showing the internal configuration of the optical scanning device 1 from above, and FIG. 3 is a cross-sectional view around the LD unit. The optical scanning device 1 of the present embodiment is a multi-beam crossing type optical scanning device that simultaneously irradiates a plurality of lights and makes them enter substantially the same location on the polygon mirror reflecting surface.
The optical scanning device 1 includes an LD unit 103, a drive substrate 102, an aperture 106, a cylindrical lens 403 (see FIG. 3), a polygon scanner 101, an fθ lens 107, a curved axis type toroidal lens 108, reflection mirrors 110 and 111, and the like. These are accommodated in the optical housing 104.
The optical housing 104 is formed by aluminum die casting, and is provided with a partition plate 104b that partitions a light source region to which the LD unit 103 and the drive substrate 102 are attached and an optical scanning region to which a polygon scanner or the like is attached. .

  The LD unit 103, which is a multi-beam light source unit, includes a first light source 401a and a second light source 401b made of a semiconductor laser, a first collimating lens 402a, and a second collimating lens 402b. In the LD unit 103, the first light source 401a and the first light source 401a and the first light source 401a and the second light source 401b are crossed in the vicinity of a polygon mirror (not shown) so that the light beam emitted from the first light source 401a and the light beam emitted from the second light source 401b intersect each other. Two light sources 401b are mounted and held. The light beams emitted from the first light source 401a and the second light source 401b are adjusted in their optical axes and focal points by the first collimating lens 402a and the second collimating lens 402b. A first light source 401a and a second light source 401b are fixed to the LD unit 103 at a predetermined interval. The LD unit 103 to which the two light sources are fixed is attached to the optical housing 104 so as to be rotatable with respect to the scanning optical system. By rotating the LD unit 103, the beam pitch on the surface of the photoreceptor 50 is adjusted. The In the present embodiment, the LD unit 103 is rotated and adjusted so that the beam pitch is 21.2 [μm] in order to achieve 1200 [dpi], and then fixed to the optical housing 104.

  The driving substrate 102 fixed to the light source region controls driving of the polygon motor 101a and the like, and is screwed to the base table 104a of the optical housing 104. In the optical scanning area, an aperture 106, a cylindrical lens 403, a polygon scanner 101, an fθ lens 107, a curved axis type toroidal lens 108, reflection mirrors 110 and 111, and the like are fixed. The polygon scanner 101 includes a polygon motor 101 a, a polygon mirror (not shown) that is a rotating polygon mirror, and the like, and is fixed to the base table 104 a of the optical housing 104. The aperture 106 is provided with two rectangular slits as shown in FIG. The light beam from the first light source 401a passes through one slit 301a (see FIG. 8) and is shaped into a rectangular light beam, and the light beam from the second light source 401b passes through the other slit 301b to form a rectangular light beam. It is shaped.

  As shown in FIG. 5, the light beams 502 and 503 emitted from the first light source 401a and the second light source 401b fixed to the LD unit 103 pass through the collimator lenses 402a and 402b, respectively, and then exit the LD unit 103. Enter the scan area. Then, after being shaped into a fixed shape by the aperture 106, the light is condensed in the sub-scanning direction (direction corresponding to the direction of movement of the photosensitive member surface on the photosensitive member surface) by passing through the cylindrical lens 403. Next, the light is reflected by the reflecting mirror 110, crosses in the vicinity of a polygon mirror (not shown), and enters the polygon mirror. The light incident on the polygon mirror is deflected in the main scanning direction (direction corresponding to the axial direction on the surface of the photosensitive member) while being reflected by the reflection surface of the polygon mirror. The fθ lens 107 that converts the moving speed of the light beam deflected in the main scanning direction at a constant angular velocity by the polygon mirror to a constant velocity, the curved-axis toroidal lens 108 for correcting the surface tilt, the folding mirror After sequentially passing through 111, it is released out of the housing 104 and reaches the surface of the photoreceptor not shown.

Next, features of the present embodiment will be described.
The polygon motor 101a of the polygon scanner 101 rotates at high speed when deflecting and scanning light, so that the bearings and the like generate heat. Also, an electronic control component (not shown) on the drive board 102 also generates heat. Due to the heat generated by the polygon motor 101a serving as the heat generating portion of the polygon scanner 101 and the electronic control components on the drive substrate 102, the temperature inside the optical scanning device 1 becomes high, and the lens, mirror, aperture, etc. are thermally deformed, resulting in magnification deviation, beam spot Changes occur in the diameter and beam waist position. Variation in the beam waist position eliminates the depth margin and makes it difficult to achieve the required beam spot diameter specification on the photoreceptor image surface. For this reason, in this embodiment, the optical housing 104 is manufactured by aluminum die casting, and the optical housing 104 is made of an aluminum material having high thermal conductivity. As a result, heat generated from the drive substrate 102 and heat generated by the polygon motor 101a are conducted to the base base 104a of the optical housing 104, and heat can be radiated from the optical housing 104 to the outside. As a result, temperature rise in the optical scanning device 1 can be suppressed, and thermal deformation of the lens, mirror, aperture, and the like can be suppressed. The same effect can be obtained by forming the optical housing with a material having a thermal conductivity of 120 to 160 [W / m ° C.] other than aluminum, such as zinc or magnesium.
The heat transferred from the polygon motor 101a or the drive substrate 102 to the base table 104a is transferred as indicated by the arrows in FIG. Conventionally, as shown in FIG. 6, since the aperture 106 is directly fixed to the base table 104a, heat generated from the polygon motor 101a and the drive board 102 is conducted from the base table 104a to the aperture 106, and the aperture 106 is heated. End up. Since the aperture 106 is formed of a material that is easily thermally deformed, such as a resin, when the aperture 106 is heated, the shapes of the slits 301a and 301b are deformed due to thermal expansion. In particular, even if the slits 301a and 301b of the aperture 106 are slightly inclined with respect to the optical axis, the slits are tapered and thin so that the spot diameter is not significantly affected. Around, the temperature easily rises and is easily deformed by thermal expansion. As a result, the light after passing through the aperture is not shaped into a desired shape, causing problems such as fluctuations in the beam spot diameter.
Therefore, in the optical scanning device 1 of the present embodiment, an aperture fixing base is provided in the optical housing, and the height from the base base 104a of the receiving surface, which is an aperture mounting surface provided in the aperture fixing portion to which the aperture 106 is attached, is set in the optical path. The height is higher than the height from the base table 104a. This will be specifically described below.

FIG. 7 is a perspective view showing how the aperture 106 is fixed to the optical scanning device 1, and FIG. 8 is a perspective view showing how the aperture 106 is fixed to the apparatus main body. In the figure, the X-axis direction is the light traveling direction from the LD unit, the Y-axis direction is the vertical direction, and the Z-axis direction is a direction orthogonal to the X-axis and the Y-axis.
As shown in FIG. 7, an aperture fixing base 201 serving as an aperture fixing part is provided at a position farther in the Z-axis direction than the notch 104c for allowing the light from the LD unit 103 of the partition plate 104b to pass therethrough. Accordingly, the aperture fixing base 201 does not face the slits 301a and 301b of the aperture 106. Therefore, the aperture fixing base 201 does not block the light that has passed through the slits 301a and 301b. Further, as shown in FIG. 9, the aperture fixing base is hollow, and the inner peripheral surface of the aperture fixing base is in contact with the outside air. On the upper surface 201a of the aperture fixing base 201, an aperture receiving surface 205 as an aperture mounting surface is provided. A guide pin 202 is provided. The aperture receiving surface 205 is a surface on which flatness is obtained by performing secondary processing. In the center of these receiving surfaces 205, a screw hole 206 in which a female screw is cut is provided.

The aperture 106 is provided with a flange surface 203 at the upper end of the slit surface 207 in which the slits 301 a and 301 b are formed, and guide holes 204 a and 204 b into which the guide pins 202 are inserted are formed at both ends of the flange surface 203. Is provided. The first guide hole 204a is a long hole extending in the Z-axis direction in the figure, and the length in the optical axis direction (X-axis direction in the figure) is substantially the same as the diameter of the guide pin 202. The second guide hole 204 b is a hole having a diameter substantially the same as the diameter of the guide pin 202. Inside the guide holes 204a and 204b, a through hole 208 is provided for the screw to pass therethrough.
Further, the length of the slit surface 207 of the aperture 106 in the vertical direction (Y-axis direction in the drawing) is shorter than the length from the base base 104a to the aperture receiving surface 205. With this configuration, when the aperture 106 is fixed, contact between the lower end of the slit surface 207 of the aperture 106 and the base 104a can be avoided (see FIG. 3). Thereby, heat is not directly transferred from the base 104a to the aperture 106. Further, by making the length of the slit surface 207 in the Z-axis direction shorter than the length between the aperture fixing bases 201, heat transfer from the aperture fixing portion 201 becomes only the flange surface 203, and the temperature increase of the aperture 106 is suppressed. be able to.

  The aperture 106 is fixed to the apparatus main body by inserting the guide pin 202 into the guide holes 204 a and 204 b and bringing the flange surface 203 into contact with the surface 205. By inserting the guide pin 202 into the guide holes 204a and 204b, the aperture 106 is positioned in the X-axis direction (optical axis direction), the Z-axis direction, and the rotation direction about the Y-axis center in the figure. That is, since the second guide hole 204b has almost the same diameter as the guide pin 202, the guide pin 202 is inserted into the second guide hole 204b, thereby positioning in the Z-axis direction. Thereby, the shift | offset | difference of the main scanning direction of the light which passed the aperture 106 can be suppressed. Further, since the length of the first guide hole 204a in the X-axis direction is substantially the same as the diameter of the guide pin 202, the guide pin 202 is inserted into the first guide hole 204a and the second guide hole 204b. , Positioning in the X-axis direction and the rotation direction about the Y-axis center is performed. Since positioning in the rotational direction about the Y-axis center is performed, the slits 301a and 301b can be orthogonal to the optical axis, and a desired spot diameter can be obtained.

  Further, since the flatness of the receiving surface 205 is obtained by secondary processing, when the flange surface 203 abuts on the receiving surface 205, the Y axis direction of the aperture 106, the rotation direction about the X axis, and Z Positioning with the rotational direction of the shaft center is performed. By positioning the aperture 106 in the Y-axis direction, deviation in the sub-scanning direction of light that has passed through the aperture 106 is suppressed. Further, by positioning the aperture 106 in the rotation direction about the Z-axis, the slits 301a and 301b can be orthogonal to the optical axis, and a desired spot diameter can be obtained. Further, since the aperture 106 is positioned in the rotation direction about the X axis, the slits 301a and 301b are not shifted in the rotation direction with respect to the optical axis, and the light after passing through the aperture can be shaped into a desired shape. it can.

  When the aperture 106 is positioned in this manner, as shown in FIG. 8, the screw 113 is inserted into the through hole 208, the screw is screwed into the screw hole 206, and the aperture 106 is fixed to the aperture fixing base 201.

  In the present embodiment, as shown in FIG. 9, the inner peripheral surface of the aperture fixing base 201 is in contact with the outside air, so that heat conducted from the base base 104 a to the aperture fixing base 201 is transmitted from the aperture fixing base 201. Released to the outside. In addition, as shown in FIG. 9, the height H of the aperture receiving surface 205, which is an aperture mounting surface, from the base table 104a is higher than the height h of the optical path L from the base table 104a. Accordingly, the distance from the base table 104a to the aperture receiving surface 205 is longer than the height H of the aperture receiving surface 205 from the base table 104a is lower than the height h of the optical path L from the base table 104a. can do. As a result, in the process in which heat is conducted from the aperture fixing base 201 to the receiving surface 205, the amount of heat released from the aperture fixing base 201 is such that the height H of the aperture receiving surface 205 from the base base 104a is equal to that of the optical path L. The number can be increased as compared with a height lower than the height h from the base table 104a. As a result, the temperature rise of the receiving surface 205 can be suppressed as compared to the case where the height H of the aperture receiving surface 205 from the base table 104a is lower than the height h of the optical path L from the base table 104a. As a result, the amount of heat conducted from the receiving surface 205 to the aperture 106 can be reduced, and the temperature rise of the aperture 106 can be suppressed. Thereby, the deformation of the slits 301a and 301b due to the thermal expansion of the aperture can be suppressed, and the light after passing through the aperture can be shaped into a desired shape.

  Further, according to the optical scanning device 1 of the present embodiment, the aperture receiving surface 205 is flattened by secondary processing. Therefore, the aperture 106 is brought into contact with the receiving surface 204 to position the aperture 106. It can be carried out. As a result, it is possible to prevent the aperture 106 from being fixed due to the aperture 106 being inclined in the optical axis direction or falling down.

  The aperture 106 is provided with a slit surface 207 in which slits 301 a and 301 b are formed and a flange surface 203 that extends perpendicularly from the slit surface 207 and is fixed in contact with the aperture receiving surface 205. Thus, by bringing the flange surface 203 into contact with the receiving surface 205, the aperture 106 is moved in the vertical direction (Y-axis direction), the rotation direction about the optical axis (X-axis), and both the vertical direction and the optical axis direction. Positioning with the rotation direction of the orthogonal Z-axis center can be performed. As a result, it is possible to suppress the deviation in the sub-scanning direction of the light that has passed through the slits 301a and 301b and to shape it into a desired beam shape.

  Also, guide holes 204a and 204b are provided in the flange surface 203, and guide pins 202 that engage with the guide holes 204a and 204b are provided in the aperture fixing base upper surface 201a, whereby the aperture 106 is moved in the X-axis (optical axis) direction. It can be positioned in the rotational direction around the Y axis (vertical direction). As a result, it is possible to suppress the deviation in the sub-scanning direction of the light that has passed through the slits 301a and 301b and to shape it into a desired beam shape.

  Further, by providing the aperture fixing base 201 as the aperture fixing portion at a position not facing the slits 301a and 301b of the aperture 106, the aperture fixing base 201 does not block the light beam.

  Moreover, the heat conduction of the optical housing 104 can be enhanced by configuring the optical housing 104 with aluminum. As a result, heat generated from the polygon scanner 101 or the like as the deflecting means is conducted to the optical housing 104 and can be radiated from the optical housing 104 to the outside air. Thereby, the temperature rise in the optical scanning device can be suppressed.

  Further, by using the LD unit 103 that is a multi-beam light source unit that includes a plurality of light sources and emits a plurality of light beams, high density in the sub-scanning direction can be achieved.

1 is a schematic configuration diagram illustrating an image forming apparatus according to an embodiment. FIG. 2 is a schematic cross-sectional view illustrating a configuration of an optical scanning device. Sectional drawing around LD unit. The figure which shows the shape of a slit. The figure explaining the path | route of the light until it injects into a polygon mirror from LD unit. The figure explaining fixation of the conventional aperture. The perspective view which shows a mode that an aperture is fixed to the optical scanning device 1. FIG. The perspective view which shows a mode that the aperture was fixed to the apparatus main body. The perspective view around an aperture fixing stand.

Explanation of symbols

1: optical scanning device 50: photoconductor 51: charging device 52: developing device 53: transfer roller 54: cleaning device 55: paper feed cassette 56: registration roller pair 57: fixing device 58: paper discharge roller pair 59: stack tray 101 : Polygon scanner 101a: Polygon motor 102: Drive substrate 103: LD unit 104: Optical housing 104 a: Base base 106: Aperture 201: Aperture fixing base 202: Guide pin 203: Flange surfaces 204 a and 204 b: Guide hole 205: Receiving surface 206 : Screw hole 207: Slit surface 208: Through-holes 301 a and 301 b: Slit h: Height from the base of the optical path H: Height of the aperture receiving surface from the base
L: Light path

Claims (8)

An optical housing that houses a light source, an aperture that shapes the light beam emitted from the light source into a target shape, and a deflection scanning unit that deflects and scans the light beam, and is scanned by the light beam emitted from the light source In an optical scanning device for optically scanning an object,
Wherein the optical housing has a base stand before Symbol deflection scanning means is fixed, provided on the base stand on, and said aperture mounting surface aperture is attached,
An optical scanning device characterized in that the height of the aperture mounting surface from the base table is higher than the height of the optical path from the base table. The optical scanning device according to claim 1.
2. The optical scanning device according to claim 1, wherein the aperture mounting surface is a surface having flatness obtained by secondary processing. The optical scanning device according to claim 2.
The aperture includes a slit surface in which a slit is formed, a flange surface that extends perpendicularly from the slit surface, contacts the aperture mounting surface, and is fixed to the aperture fixing portion in which the aperture mounting surface is formed. An optical scanning device. The optical scanning device according to claim 3.
An optical scanning device characterized in that a guide hole is provided in the flange surface, and a guide pin that engages with the guide hole is provided in the aperture fixing portion. In the optical scanning device in any one of Claims 1 thru | or 4,
The optical scanning device according to claim 1, wherein the aperture fixing portion is provided at a position not facing the slit of the aperture. The optical scanning device according to claim 1,
The optical scanning device characterized in that the housing is made of aluminum. In the optical scanning device in any one of Claims 1 thru | or 6,
An optical scanning device comprising a plurality of light sources and a multi-beam light source unit that emits a plurality of light beams. A latent image carrier that carries a latent image, an optical scanning unit that forms a latent image on the surface of the latent image carrier by optical scanning, and a developing unit that develops the latent image carried on the latent image carrier. In the image forming apparatus provided,
An image forming apparatus using the optical scanning device according to claim 1 as the optical scanning unit.

Images