JP5061178B2 - Optical scanning apparatus and image forming apparatus - Google Patents

Description

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

  2. Description of the Related Art Conventionally, an optical scanning device, which is a main component of an image forming unit incorporated in an image forming apparatus such as a copying machine or a multifunction peripheral, has a housing having a predetermined volume space inside. In this housing, a polygon comprising a light beam generator (light beam emitting means) for generating a light beam (laser light) and a hexagon for deflecting the light beam emitted from the light beam generator. A mirror, a polygon motor (polygon scanner motor) that rotationally drives the polygon mirror, a control board that supports the polygon motor and mounts electronic components such as an IC, and a light beam deflected by the polygon mirror is used as a photosensitive member An optical element such as an imaging lens (fθ lens) for image formation is provided.

  By the way, the polygon motor attached to the control board generates heat when driven. As the polygon motor generates heat in this manner, the inside of the housing is heated, and various components arranged inside the housing are affected by the heat. For this reason, conventionally, countermeasures against heat have been taken in the optical scanning device.

  And in patent document 1, the method of cooling the inside of a housing is disclosed by forming the ventilation path through which air flows with respect to a housing, and releasing the heat inside a housing to the exterior through this ventilation path.

JP 2008-33135 A

However, the above-described light beam generator, polygon motor, and optical element are installed in the housing. When a hollow air passage is formed in the dark cloud for such a housing, the heat deformation is locally increased by the housing shape being greatly changed from the square shape, and the light beam generator, polygon motor In addition, the installation area of the optical element may be greatly distorted.
When the installation area of the light beam generator, the polygon motor and the optical element in the housing is distorted, these are inclined, and the light beam cannot be guided well.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to suppress poor light beam guiding due to thermal deformation of a housing in an optical scanning device.

  The present invention adopts the following configuration as means for solving the above-described problems.

  The first invention includes a light beam emitting means for emitting a light beam, a light guiding means for guiding the light beam, a deflecting means for deflecting the light beam, the light beam emitting means, the light guiding means, and An optical scanning device comprising a box-shaped housing for holding the deflecting means, wherein the housing comprises a base portion on which the light beam emitting means, the light guiding means and the deflecting means are installed, and an interior of the housing. A configuration is adopted in which a lid is provided with a concave heat radiation channel that transfers heat to the fluid.

  According to a second invention, in the first invention, a configuration is adopted in which the lid portions are respectively arranged with respect to the upper and lower sides of the base portion, and each lid portion includes the heat radiation channel.

  According to a third invention, in the first or second invention, the heat dissipation flow path is provided so as to extend in the same direction, and the flow direction of the fluid is opposite to each heat dissipation flow path. To do.

  According to a fourth aspect of the present invention, in any one of the first and second aspects of the present invention, a configuration is provided in which heat transfer means is provided in the heat dissipation flow path and transfers heat from the deflection means to the heat dissipation flow path. .

  According to a fifth invention, in any one of the first to fourth inventions, the light guide means includes a plurality of optical elements extending in the same direction, and the heat dissipation channel is the same as the extending direction of the optical elements. A configuration that extends in the direction is adopted.

  A sixth invention is the above-mentioned first invention, comprising a polygon mirror and a polygon motor arranged in the center of the base portion as the deflecting means and deflecting the light beams emitted from the two light beam emitting means, A configuration is adopted in which the lid portions are respectively disposed above and below the base portion, and the heat radiation passages are formed above and below the deflection means.

  According to a seventh invention, in the sixth invention, an area in which the inside of the housing guides the light beam emitted from one light beam emitting means and the other light beam emitting means by the heat radiating flow path. A configuration is adopted in which the light beam emitted from is divided into regions that guide the light beam.

  According to an eighth aspect of the present invention, there is provided an optical scanning device that emits and scans a light beam, a photosensitive member on which an electrostatic latent image is formed by irradiation with the light beam, and developing the electrostatic latent image. An image forming apparatus provided with a developing device for forming a toner image, wherein the optical scanning device according to any one of the first to seventh inventions is employed.

According to the present invention, the housing has a base portion on which the light beam emitting means, the light guiding means, and the deflecting means are installed, and a lid portion having a concave heat radiation channel for transferring heat inside the housing to the fluid. is doing. For this reason, the thermal deformation of the housing due to the heat radiation channel is concentrated on the lid portion, and the influence on the base portion on which the light beam emitting means, the light guiding means and the deflecting means are installed is reduced.
Therefore, according to the present invention, in the optical scanning device, it is possible to suppress the poor light beam guiding due to the thermal deformation of the housing.

1 is a cross-sectional view illustrating a schematic configuration of a copying machine according to a first embodiment of the present invention. 1 is a perspective view showing a schematic configuration of a laser scanning unit provided in a copying machine according to a first embodiment of the present invention. FIG. 2 is a bottom view of a laser scanning unit provided in the copier according to the first embodiment of the present invention. It is a perspective view which shows schematic structure of the laser scanning unit with which the copying machine in 2nd Embodiment of this invention is provided.

  Hereinafter, an embodiment of an optical scanning device and an image forming apparatus according to the present invention will be described with reference to the drawings. In the following drawings, the scale of each member is appropriately changed in order to make each member a recognizable size. In the following description, a copying machine will be described as an example of the image forming apparatus of the present invention.

(First embodiment)
FIG. 1 is a cross-sectional view showing a schematic configuration of a copying machine P according to the present embodiment. As shown in this figure, the copier P of this embodiment includes an image reading unit 1 that reads an image of a document, and a printing unit 2 that prints on a recording sheet (recording medium) based on the read image data. ing.

  The image reading unit 1 irradiates an image of a document with light and receives reflected light to read the image of the document as image data. The image reading unit 1 receives light returned from the light source device or the document that irradiates the document with light. It includes a light receiving sensor that receives light and converts it into image data.

  The printing unit 2 includes a belt unit 6, an image forming unit 7, a paper feed cassette 8, a paper feed tray 9, a secondary transfer unit 10, a fixing unit 11, a paper discharge tray 12, and a conveyance path 13. It has.

The belt unit 6 transfers the toner image formed in the image forming unit 7 and conveys the transferred toner image. The belt unit 6 includes an intermediate transfer belt 61 to which the toner image is transferred from the image forming unit 7, and an intermediate transfer belt 61. A transfer roller 61 is provided, and a driving roller 62 that drives the transfer belt 61 endlessly, a driven roller 63, and a tension roller 64 are provided.
The intermediate transfer belt 61 is stretched around a driving roller 62, a driven roller 63, and a tension roller 64.
The drive roller 62 is connected to a drive unit having a drive source such as a motor, and rotates while applying a grip force to the intermediate transfer belt 61.
The driven roller 63 is driven to rotate following the rotational drive of the drive roller 62.
The tension roller 64 is a kind of driven roller that is driven to rotate by the rotational driving of the driving roller 62, and has a spring mechanism to apply tension to the intermediate transfer belt 61.
Further, the belt unit 6 is provided with a cleaning unit (not shown) so that the toner remaining on the intermediate transfer belt 61 is removed.

  The image forming unit 7 is provided corresponding to each color of yellow (Y), magenta (M), cyan (C), and black (BK), and forms a toner image of each color. These image forming units 7 are arranged along the intermediate transfer belt 61.

Each image forming unit 7 includes a photoreceptor 71, a charger 72, a laser scanning unit 73 (optical scanning device), a developing device 74, a primary transfer roller 75, a cleaning device 76, a neutralizing device (not shown), and the like. Have
The photosensitive member 71 is formed in a cylindrical shape, and an electrostatic latent image and a toner image based on the electrostatic latent image are formed on the peripheral surface thereof. The charger 72 is disposed to face the photoconductor 71 and charges the peripheral surface of the photoconductor 71. The laser scanning unit 73 scans the circumferential surface of the charged photoreceptor 71 with laser light emitted based on the image data in the print format. The developing device 74 develops a toner image based on the electrostatic latent image on the circumferential surface of the photoreceptor 71 by supplying toner to the circumferential surface of the photoreceptor 71. The primary transfer roller 75 is disposed opposite to the photoreceptor 71 with the intermediate transfer belt 61 interposed therebetween, and primarily transfers the toner image developed on the photoreceptor 71 to the intermediate transfer belt 61. The cleaning device 76 removes toner remaining on the photoreceptor 71 after the primary transfer.

The paper feed cassette 8 can be pulled out with respect to the apparatus main body and accommodates storage paper. The paper feed tray 9 is openable and closable with respect to the apparatus main body, and stores storage paper.
The secondary transfer unit 10 performs secondary transfer of the image formed on the intermediate transfer belt 61 to a storage medium. The secondary transfer unit 10 sandwiches the drive roller 62 that drives the intermediate transfer belt 61 and the intermediate transfer belt 61 therebetween. The drive roller 62 and the secondary transfer roller 10a are arranged to face each other.
The fixing unit 11 fixes the toner image secondarily transferred onto the storage medium to the recording paper, and includes a heating roller that fixes the toner image to the recording paper by applying pressure and heating.
The transport path 13 includes a pickup roller 13 a that unloads the storage paper from the paper feed cassette 8, a paper feed roller 13 b that transports the storage medium, a paper discharge roller 13 c that discharges the storage medium to the paper discharge tray 12, and the like.

  The copying machine P of the present embodiment having such a configuration acquires image data in the image reading unit 1 as described above, and the printing unit 2 prints on recording paper based on the image data.

Next, a laser scanning unit (LSU) 73 in the copying machine P according to the present embodiment will be described with reference to FIGS. As described above, the laser scanning unit 73 is provided corresponding to each color of yellow (Y), magenta (M), cyan (C), and black (BK), but in this embodiment, The laser scanning unit 73 provided for yellow (Y) and the laser scanning unit 73 provided for magenta (M) are integrated into a laser scanning unit 73a, which is provided for cyan (C). The laser scanning unit 73 and the laser scanning unit 73 provided for black (BK) are integrated to form a laser scanning unit 73b, which is miniaturized.
Since each laser scanning unit 73a, 73b has the same configuration, only one laser scanning unit 73a will be described in the following description.
2 is a cross-sectional view of the laser scanning unit 73a, and FIG. 3 is a bottom view of the laser scanning unit 73a.

The laser scanning unit 73a includes a housing 30, a light beam generator 31 (light beam emitting means), a polygon mirror 32, a polygon motor 33, a control board 34, and optical elements 35a to 39a and 35b to 39b. ing.
In the present embodiment, the light beam is deflected by the polygon mirror 32 and the polygon motor 33. That is, in this embodiment, the deflection means in the present invention is constituted by the polygon mirror 32 and the polygon motor 33.
In the present embodiment, the light beam is guided by the optical elements 35a to 39a and 35b to 39b. That is, in this embodiment, the light guide means in the present invention is configured by optical elements 35a to 39a and 35b to 39b.

  The housing 30 is made of a hollow box-shaped synthetic resin and includes a base portion 30a, an upper lid portion 30b (lid portion), and a lower lid portion 30c (lid portion) as shown in FIG. .

The base 30a is provided with a light beam generator 31, a polygon mirror 32, a polygon motor 33, a control board 34, and optical elements 35a to 39a and 35b to 39b, and the upper and lower ends are open. It is considered as an end.
Moreover, the upper cover part 30b closes the upper end of the base part 30a, and the lower cover part 30c closes the lower end of the base part 30a. And each upper cover part 30b and the lower cover part 30c have the concave heat radiation flow path 30b1, 30c1 which transfers the heat inside the housing 30 to an air flow. That is, in the copying machine P of the present embodiment, the lid portions (upper lid portion 30b and lower lid portion 30c) are arranged on the upper and lower sides of the base portion 30a, and the lid portions (upper lid portion 30b and lower lid portion 30c) are arranged. Radiation flow paths 30b1 and 30c1 are provided.

  More specifically, the base portion 30a is formed by integrally molding a housing substrate 30d that bisects the interior of the housing 30 and a side wall 30e of the housing 30. Near the left and right side walls 30e of the housing substrate 30d, there are provided slits 30a1 and 30a2 for allowing light beams reflected by optical elements 36a and 36b (reflection mirrors) described later to pass therethrough.

The upper end of the base portion 30a is covered with the upper lid portion 30b, and the lower end of the base portion 30a is covered with the lower lid portion 30c. On the outer side of the lower lid portion 30c, a concave heat radiation channel 30c1 is formed across the entire lower lid portion 30c (in FIG. 3, the whole from the upper end to the lower end) while passing through the center portion thereof. . The most depressed portion of the heat dissipation channel 30c1 (in FIG. 2, the upper end portion of the heat dissipation channel 30c1) is configured to be in contact with the bottom surface of the housing substrate 30d. The lower lid portion 30c is provided with slits 30c2 and 30c3 for allowing light beams reflected by optical elements 39a and 39b (reflecting mirrors), which will be described later, to pass near the heat radiation channel 30c1.
That is, the housing 30 has an upper chamber X formed on the upper side thereof by the housing substrate 30d, and lower chambers Y1 and Y2 divided by the heat radiation channel 30c1 are formed on the lower side of the housing substrate 30d.

  Here, the inside of the housing 30 is divided into two vertically by the housing substrate 30d. However, when the laser scanning unit 73a that can be placed in FIG. Divide into left and right. Therefore, in the present invention, the phrase “dividing the inside of the housing up and down” means simply dividing the inside of the housing 30 into two.

  The light beam generator 31 is fixed to the housing 30 and is fixed to the side wall 30e of the base portion 30a located on the back side of the sheet of FIG. The light beam generator 31 irradiates the polygon mirror 32 provided in the housing 30 with a light beam.

  The polygon mirror 32 deflects the light beam emitted from the light beam generator 31 and has a polygonal shape (in the illustrated example, a hexagon). The outer periphery of the polygon mirror 32 is formed of a reflection mirror, and the center position of the polygon mirror 32 is attached so as to penetrate the rotation shaft of the polygon motor 33.

  The polygon motor 33 rotates the polygon mirror 32, and is composed of a precision motor such as a DC brushless motor. The polygon motor 33 is installed on the control board 34.

The control board 34 is made of a plate material containing metal, and its planar shape is rectangular. Then, one surface side, that is, the back surface side of the control substrate 34 is fixed to the upper surface of the housing substrate 30d through four screws (not shown). Further, a polygon motor 33 is fixed on the side surface side of the control board 34.
Although omitted in FIG. 2, electronic components such as a driving IC for the polygon motor 33 are mounted on the surface side of the control board 34. The control board 34 is also provided at the central portion of the upper surface of the housing substrate 30d because the polygon mirror 32 is provided at the central portion of the upper surface of the housing substrate 30d.

Among the optical elements 35a to 39a and 35b to 39b, the optical elements 35a and 35b are fθ lenses provided in the upper chamber X, and function to form an image of the light beam emitted from the polygon mirror 32. The polygon mirror 32 is provided on the left and right sides, respectively.
The optical elements 36a and 36b are reflection mirrors, which are provided outside the optical elements 35a and 35b, respectively, and can guide the light beams emitted from the polygon mirror 32 to the lower chambers Y1 and Y2 through the slits 30c2 and 30c3, respectively. It is configured as follows.
The optical elements 37a and 37b are reflection mirrors provided in the lower chambers Y1 and Y2, respectively, and are configured to be able to irradiate the lower chambers Y1 and Y2 with light beams guided through the slits 30a1 and 30a2, respectively. .
The optical elements 38a and 38b are long lenses provided in the lower chambers Y1 and Y2, respectively, and are provided on the inner side (radiation flow path 30c1 side) than the optical elements 37a and 37b. These optical elements 38a and 38b act so that the light beams emitted from the optical elements 37a and 37b can be uniformly irradiated onto the photoconductor 71 without any difference in magnification.
The optical elements 39a and 39b are reflection mirrors, which are provided inside the optical elements 38a and 38b (on the side of the heat radiation channel 30c1), respectively, so that the photosensitive member 71 can be irradiated through the slits 30c2 and 30c3. It is configured.

  In the present embodiment, the optical elements 35a to 39a and 35b to 39b are provided so as to extend in the same direction and extend in the same direction as the heat radiation channels 30b1 and 30c1.

Further, as shown in FIG. 1, the copying machine P of the present embodiment causes the air flow to flow through the fan device 14 that flows the air flow through the heat dissipation flow path 30b1 of the upper lid portion 30b and the heat dissipation flow path 30c1 of the lower cover portion 30c. And a fan device 15.
In the present embodiment, as shown in FIG. 2, the fan devices 14 and 15 form an air flow a <b> 1 from the front side to the back side in the heat dissipation flow path 30 b 1 of the upper lid portion 30 b, and the lower lid An air flow a2 is formed in the heat radiation channel 30c1 of the portion 30c from the back side to the front side. In other words, in the present embodiment, the flow direction of the air flow a1 flowing with respect to the heat dissipation flow path 30b1 of the upper lid portion 30b is opposite to the flow direction of the air flow a2 flowing with respect to the heat dissipation flow path 30c1 of the lower lid portion 30c. It is said that.
Conventionally, there are cases in which a fan device is installed in a copying machine to cool the photoreceptor 71 or the like. In such a case, the existing fan device can also be used as one of the fan devices 14 and 15. As a result, the number of installed fan devices can be reduced and the copying machine can be miniaturized.

  In the laser scanning units 73a and 73b configured as described above, a light beam generated based on the image data is emitted from the light beam generator 31, and this light beam is applied to the polygon mirror 32. The light beam applied to the polygon mirror 32 is scanned by the rotation of the polygon mirror 32. The scanned light beams are optical elements 35a and 35b (fθ lenses), optical elements 36a and 36b (reflective mirrors), optical elements 37a and 37b (reflective mirrors), and optical elements 38a and 38b (long lenses). In addition, the light is guided onto the photoconductor 71 through optical elements 39a and 39b (reflection mirrors). On the photoconductor 71, an electrostatic latent image is formed by the irradiated light beam based on a detection signal for determining an image writing position on the photoconductor 71.

According to the laser scanning unit 73 provided in the copying machine P of the present embodiment, the housing 30 includes the light beam generator 31, the polygon mirror 32, the polygon motor 33, the control board 34, the optical elements 35a to 39a, 35b to 39b are provided with a base portion 30a and lid portions (upper lid portion 30b and lower lid portion 30c) provided with heat radiation passages 30b1 and 30c1 having concave stripes for transferring heat inside the housing 30 to the airflows a1 and a2. ).
For this reason, the thermal deformation of the housing 30 due to the heat radiation channels 30b1 and 30c1 is concentrated on the lid portions (upper lid portion 30b and lower lid portion 30c), and the light beam generator 31, polygon mirror 32, polygon motor 33, The influence on the base portion 30a on which the control board 34 and the optical elements 35a to 39a and 35b to 39b are installed is reduced.
Therefore, according to the laser scanning unit 73 provided in the copying machine P according to the present embodiment, it is possible to suppress a poor light beam guiding due to thermal deformation of the housing 30.

Further, in the laser scanning unit 73 provided in the copying machine P of the present embodiment, lid portions (upper lid portion 30b and lower lid portion 30c) are respectively arranged on the upper and lower sides of the base portion 30a, and each lid portion (upper lid portion 30b). The lower lid portion 30c) is provided with heat radiation channels 30b1 and 30c1.
For this reason, the heat in the housing 30 can be radiated from both the upper and lower directions, and the heat in the housing 30 can be radiated to the outside more efficiently.

In the above embodiment, the single polygon mirror 32 and the polygon motor 33 deflect the light beams emitted from the two light beam generators 31. Therefore, the number of polygon mirrors and polygon motors can be reduced as compared with the case where a polygon mirror and a polygon motor are provided for each light beam emitted from the light beam generator 31.
Further, in the above embodiment, the polygon mirror 32 and the polygon motor 33 are disposed in the center of the base portion 30 a, and the heat radiation channels 30 b 1 and 30 c 1 are formed above and below the polygon mirror 32 and the polygon motor 33. For this reason, the polygon mirror 32 and the polygon motor 33 can be radiated from both the upper and lower directions, and the heat in the housing 30 can be radiated to the outside more efficiently.

Further, in the above-described embodiment, the inside of the housing 30 guides the light beam emitted from one light beam generator 31 (lower chamber Y1) and the other light beam is generated by the heat radiating flow path 30c1. It is divided into a region (lower chamber Y2) for guiding the light beam emitted from the vessel 31.
For this reason, it is not necessary to separately provide a partition for dividing two regions (lower chamber Y1 and lower chamber Y2), and it is possible to reduce the material for forming the housing.

Further, in the laser scanning unit 73 provided in the copying machine P of the present embodiment, the heat radiation channels 30b1 and 30c1 are provided to extend in the same direction, and the air flows a1 and a2 are provided to the heat radiation channels 30b1 and 30c1. The direction of flow is reversed.
For this reason, in the extending direction of the heat radiation flow paths 30b1 and 30c1, a cold air flow flows from both sides to the heat radiation flow paths 30b1 and 30c1, whereby the laser scanning unit 73 can be cooled uniformly.

Further, in the laser scanning unit 73 provided in the copying machine P of the present embodiment, the optical elements 35a to 39a and 35b to 39b are provided to extend in the same direction, and are in the same direction as the heat radiation channels 30b1 and 30c1. It extends to.
Therefore, the air flows a1 and a2 flow along the optical elements 35a to 39a and 35b to 39b, and the optical elements 35a to 39a, 35b to 39b themselves are subjected to thermal deformation of the entire optical elements 35a to 39a, 35b to 39b. It becomes possible to suppress over the range.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the description of the second embodiment, the description of the same parts as in the first embodiment will be omitted or simplified.

FIG. 4 is a cross-sectional view of the laser scanning unit 73a in the present embodiment. As shown in this figure, in the copying machine P of the present embodiment, the laser scanning unit 73a is disposed in the heat radiating flow path 30c1, and the heat radiating fin 40 (heat transfer means) transfers heat from the polygon motor 33 to the heat radiating flow path 30c1. ).
The heat radiating fins 40 are constituted by a plurality of fin members that are erected along the flow direction of the air flow a2 in the heat radiating flow path 30c1.

  By providing such heat radiation fins 40, the surface area for the air flow a2 is increased, and the heat of the polygon motor 33 can be efficiently radiated to the heat radiation flow path 30c1.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

For example, in the above-described embodiment, the configuration in which the laser scanning unit 73 that is an example of the optical scanning device of the present invention is mounted on a copying machine that is one of the image forming apparatuses has been described.
However, the optical scanning device of the present invention is not limited to this, and may be mounted on a device such as a measuring instrument or an inspection device in addition to an image forming apparatus such as a copying machine.

  P: Copying machine (image forming apparatus), 71: Photoconductor, 73, 73a, 73b ... Laser scanning unit (optical scanning apparatus), 74: Developing apparatus, 30 ... Housing, 30a: Base section, 30b... Upper lid part (lid part), 30b1... Heat radiation channel, 30c... Lower lid part (lid part), 30c1. Polygon mirror 33 Polygon motor 35a, 35b Optical element (fθ lens) 36a 36b 37a 37b 39a 39b Optical element (reflection mirror) 38a 38b Optical element (Long lens), 40 ... heat dissipation member (heat transfer means), a1, a2 ... air flow (fluid)

Claims (6)

A light beam emitting means for emitting a light beam, a light guide means for guiding the light beam, a deflecting means for deflecting the light beam, the light beam emitting means, the light guide means, and the deflecting means are held. An optical scanning device comprising a box-shaped housing,
The housing is
A base portion on which the light beam emitting means, the light guiding means and the deflecting means are installed;
A lid provided with a concave heat radiation channel for transferring heat inside the housing to the fluid ,
The optical scanning device according to claim 1, wherein the lid portions are respectively disposed above and below the base portion, and each lid portion includes the heat dissipation channel . 2. The optical scanning device according to claim 1, wherein the heat radiating passages are provided so as to extend in the same direction, and a flow direction of the fluid is opposite to each heat radiating passage . 3. The optical scanning device according to claim 1 , further comprising a heat transfer unit that is disposed in the heat dissipation channel and transfers heat of the deflection unit to the heat dissipation channel . 4. The said light guide means is provided with the some optical element extended in the same direction, The said thermal radiation flow path is extended in the same direction as the extension direction of the said optical element, The any one of Claims 1-3 characterized by the above-mentioned. The optical scanning device described. 5. The optical scanning device according to claim 1, further comprising: a fan device that causes an air flow to separately flow through the heat dissipation flow paths of the upper and lower lid portions . 6. An optical scanning device that emits and scans a light beam, a photosensitive member that forms an electrostatic latent image when irradiated with the light beam, and a developer that forms a toner image by developing the electrostatic latent image An image forming apparatus comprising:
An image forming apparatus comprising the optical scanning device according to claim 1 as the optical scanning device.

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