JP2002333592A - Optical scanner and image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact optical scanner capable of preventing stray light from occurring due to the front surface pressing member of a reflection member. SOLUTION: The reflection member 124 for reflecting a laser beam is supported in an interposing state where its posture is freely adjusted by the front surface pressing members 230 and 231 and back surface supporting members 225 and 226, and measures to prevent the stray light are taken for the surfaces of the members 230 and 231.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical scanning device provided inside an image recording device such as a laser beam printer, a digital copying machine, a facsimile, etc., for scanning a scanned object with a laser beam according to image information. More particularly, the present invention relates to an improvement in a support mechanism of an optical component of the optical scanning device.

[0002]

2. Description of the Related Art An image forming apparatus provided with an optical scanning device for scanning an object to be scanned (photosensitive drum) with a laser beam in accordance with input image information includes a mirror for reflecting the laser beam. Is provided, the supporting mechanism is, for example, as described in JP-A-9-184963, JP-A-11-223787, etc.
The configuration is such that the attitude of the reflecting member can be finely adjusted.

In the support mechanisms described in these publications, a biasing member such as a leaf spring is disposed on the non-reflective surface side (opposite to the reflective surface) of the reflective member, and an adjusting member such as a male screw is provided on the reflective surface side. Provided, the posture of the reflecting member sandwiched between the two members,
By operating the adjustment member, the adjustment can be performed.

[0004]

SUMMARY OF THE INVENTION Incidentally, Japanese Patent Application Laid-Open No.
In the case of Japanese Patent No. 184963, the attitude adjustment of the reflection member (26) can be performed only from the inside of the optical scanning device. Therefore, for adjustment, it is necessary to remove the optical box (casing) (50) fixed to the main body frame (30) of the optical scanning device by the screw (52), which is very troublesome.

Further, in the case of Japanese Patent Application Laid-Open No. H11-223787, since the structure can be adjusted only from the upper surface or the side surface of the optical scanning device, when the optical scanning device is attached to the main body of the image forming apparatus, the reflecting member ( It was difficult to adjust the posture of 24).

In order to solve these adjustment problems, for example, as shown in FIGS. 12 and 13, the adjusting members 302 are provided on both sides of the non-reflecting surface side (the back side of the reflecting surface) of the reflecting member 301. , 302 are disposed on both sides on the reflection surface side, and front pressing members 303, 3 made of a biasing member such as a leaf spring.
A configuration is conceivable in which the optical scanning device 04 is arranged to enable adjustment from the side of the optical scanning device.

More specifically, supporting members 306, 306 are erected on both sides of the frame 305 in a fixed state, and the supporting members 306, 306 are provided with the adjusting members 302, 302, the front pressing members 303, 304, and the upper pressing member ( Biasing member)
Hemispherical lower support members 308 are provided on both sides of the frame 305 to which the reflectors 307 and 307 are attached.

With such a structure, both lower sides of the reflecting member 51 are supported by the lower supporting members 308, 308 in a point contact state (slidable state). Adjustment members 302, 302
And the front pressing members 303 and 304, and the upper side portions of the reflecting member 301 are pressed down by upper pressing members (biasing members) 307 and 307.

Although the illustration of the adjusting member 52 is omitted,
For example, a pair of screws that abut on the back side of the reflecting member 301 so as to be able to advance and retreat in the vertical direction are arranged in the vertical direction.
8 is slidably supported on the reflecting member 301
Posture can be adjusted appropriately.

However, in such a configuration, the reflecting member 3
Since the front side pressing members 303 and 304 press down both sides of the front surface of the front surface 01, a relatively large (large area) pressing margin is required at both ends of the reflecting member 51 on the reflecting surface side.

Therefore, when such a support mechanism is used for a light beam turning member or the like of an optical scanning device, it is used for an effective reflection surface of the reflection member 301 (actual reflection surface of the reflection surface of the reflection member 301). Area) and the front pressing member 30
When the light beams 3 and 304 are close to each other, the emitted light beam is reflected on the surfaces of the front pressing members 303 and 304 to become stray light, and a clear image cannot be obtained.

In order to solve such a problem, as shown in FIG.
When provided at a position separated by a predetermined distance (L) from both sides of the effective reflection area (EL) of the reflection member 301, the reflection member 30
Another length of 1 is required for the length (2 L), which causes another problem that the size of the apparatus is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and can prevent the generation of stray light due to a front pressing member of an irradiated light beam (without making the reflecting member longer than the effective reflection area). The purpose is to provide.

[0014]

According to the present invention, means for solving the above-mentioned problems are constituted as follows.

(1) In a laser beam scanning apparatus using an overfield emission method for writing read image information on an electrostatic latent image carrier, a reflecting member for reflecting laser light includes a front pressing member and a rear surface. It is characterized by being supported in a holding state in which the posture can be adjusted by a supporting member, and a stray light preventing measure is applied to a surface of the front pressing member.

According to this configuration, since the surface of the front pressing member is provided with a stray light preventing measure, the front pressing member can be provided close to the effective reflection area of the reflecting member. Accordingly, it is not necessary to make the reflection member extra long as in the related art, and the size of the optical scanning device can be reduced. It is possible to prevent adverse effects such as being disturbed.

(2) The surface of the front pressing member is coated with black as a stray light preventing measure.

According to this structure, the front holding member can be prevented from stray light by a simple surface treatment.

(3) The reflection member is used as an emission turning member in an optical scanning device.
According to this configuration, since the reflection member is used as the output turning member in the optical scanning device, the size of the output turning member of the optical scanning device can be reduced, and the position adjustment of the output turning member can be easily performed from the side. Can do it.

(4) An optical scanning device according to any one of claims 1 to 3 is provided.

According to this configuration, in the image forming apparatus, image defects such as ghosts due to the influence of stray light on the photosensitive drum do not occur, and the space for adjusting the accommodation portion and the attitude of the optical scanning device of the image forming apparatus. Need not be provided in the vertical direction, and the image forming apparatus can be made compact.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an optical scanning device and an image forming apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a configuration diagram of an image forming system, FIG. 2 is a configuration diagram of main parts, FIG. 3 is a perspective view showing a configuration of an optical scanning device, and FIG. 4 is an arrangement of main optical components of the optical scanning device and a light beam. FIG. 5 is a perspective view showing an optical path, and FIG. 5 is an explanatory view of the optical path.

(Image Forming System) FIG. 1 is a sectional view showing an example of an image forming system using an optical scanning device according to the present invention. As shown in FIG. 1, a printing unit 2, a paper supply unit 3, and a paper post-processing unit 4.

First, when there is a document to be read, the document set tray 6 of the automatic document feeder 5 of the document reading section 1
The original is sequentially set on the platen glass 8 of the scanner 7, and the original image data is read by the scanner 7. The read document is discharged to a document discharge tray 9.

The printer 11 as the printing unit 2 is shown in FIG. 2 based on original image data read by the original reading unit 1 or image data sent from an external device (for example, a personal computer or FAX) via a line. A laser beam is emitted from the optical scanning device 22, and the light is scanned on a photosensitive member (photosensitive drum) 200 as a scanned object by a scanning optical system to form an electrostatic latent image on the photosensitive member 200.

The electrostatic latent image formed on the photoreceptor 200 is developed by receiving toner from the developing unit 16, and thereafter, paper is supplied from the multi-stage paper supply unit 17 of the paper supply unit 3, and the conventional electronic latent image is developed. The image on the photoreceptor 200 is transferred onto the paper by the photographic development process, the image data is visualized, and the image is fixed on the paper by the fixing device 18 and printing is completed.

The multi-stage paper feed unit 17 of the paper supply unit 3
Stores a plurality of types of paper, and operates a paper transport mechanism 171a # corresponding to the tray 171 # containing the paper selected by the user to transport the paper to the printing unit 2. .

As described above, the sheet printed by the printing unit 2 is conveyed to the sheet post-processing device 19 of the sheet post-processing unit 4 and
Stapling processing, sorting processing, and the like are performed. With the above operations, a series of image forming operations of the image forming system is completed.

(Optical Scanning Apparatus) Next, the optical scanning apparatus 22 will be described in detail with reference to FIGS. The optical scanning device 22 includes a light beam 103 irradiated from a semiconductor laser 112 as a beam emitting means toward a rotary polygon mirror 120 having a plurality of reflection surfaces 120a in a rotational direction.
(Hereinafter, referred to as an incident beam 103)
The light beam 104 formed by being reflected by the zero reflection surface 120a
This device scans the photosensitive member 200, which is the object to be scanned, by an emission beam 104 (hereinafter, referred to as an emission beam 104).

From the semiconductor laser 112 to the rotating polygon mirror 12
Various optical components are disposed in the optical path to 0 (hereinafter, referred to as an incident beam optical path) and the optical path from the rotary polygon mirror 120 to the photoconductor 200 (hereinafter, referred to as an outgoing beam optical path). Now, the optical components disposed in the incident beam optical path are referred to as an incident optical system 101, and the optical components disposed in the output beam optical path are referred to as an exit optical system 102. These components are incorporated in a housing 221. .

The incident optical system 101 includes a semiconductor laser 11
2. The incident beam 103 emitted from the
And the incident beam 103 is shaped such that the cross-sectional shape of the incident beam 103 becomes a rectangular shape having a width larger than the width of the reflection surface 120a of the rotary polygon mirror 120.

A collimator lens 113 for converting the emitted light beam into a parallel beam in the order from the semiconductor laser 112 on the incident beam optical path to the rotary polygon mirror 120, a concave lens 114 for expanding the incident light beam in the scanning direction,
An aperture plate 115 composed of a plate-like member having a rectangular opening 115a provided at a substantially central portion, a cylindrical lens 116, an incident return mirror 117 as a return means, and an fθ lens 123 are arranged in this order. The beam unit 111 is constituted by the semiconductor laser 112, the collimator lens 113, the concave lens 114, and the aperture plate 115.

Next, the output optical system 102 outputs the output beam 1 reflected by the reflecting surface 120a of the rotary polygon mirror 120.
04 is guided from the rotating polygon mirror 120 to the photoconductor 200, and the beam spot 108 when the incident beam 103 irradiates the photoconductor 200 has a predetermined size, and scans the photoconductor 200 at a constant speed. Works. In order from the rotary polygon mirror 120 to the photoreceptor 200 in the exit beam optical path, an fθ lens 123 composed of one pair of lenses 121 and 122 as a converging lens, an exit turning mirror (reflecting member) 124 as a returning unit, and A cylindrical mirror 125 for correcting the tilt of the rotating polygon mirror 120 is provided.

The incident beam 103 is reflected by the incident turning mirror 1
17, the light travels through the end of the fθ lens 123 obliquely downward and upward, and irradiates the central portion in the height direction of the reflecting surface 120 a of the rotary polygon mirror 120.

The outgoing beam 104 passes obliquely upward from the fθ lens 123 and is guided to the photoreceptor 200 via the outgoing return mirror 124 and the cylindrical mirror 125. The output beam 104 is the rotating polygon mirror 1
The light reaches the photoconductor 200 through different optical paths depending on the position of the reflective surface 120a in the rotation direction.

Now, the width of the outgoing beam 104 used for forming an image on the photosensitive member 200, that is, the outgoing beam 104 (hereinafter, referred to as the main beam scanning line 107).
The spatial region through which the emitted beam passes when the main scanning beam 105 is scanned is referred to as a main scanning beam region.

The manner in which the output beam 104 scans the photoconductor 200 is such that the output beam 104 periodically scans the main scanning line 107 while the photoconductor 200 rotates.
A different location is scanned on the photoconductor 200 at regular intervals.

The output beam 104 is applied to the photosensitive member 20.
Each time 0 is scanned, the writing start point l of the main scanning line 107 is
A synchronization detection device 129 for synchronizing each scan is provided so that 07a is the same.

The synchronization detecting device 129 outputs a signal for synchronization to the output beam 1 outside the main scanning beam area.
04 (hereinafter, referred to as a synchronization detection beam 106).

After the synchronization detection beam 106 passes through the fθ lens 123, the synchronization detection sensor 127 detects the end 12 of the exit turning mirror 124 of the exit optical system 102.
The synchronous beam that has been turned back by 4a and further turned back by the turning mirror 126 as the synchronous beam turning means is detected.

FIG. 5 shows the operation of the input optical system and the output optical system shown in FIGS. 3 and 4 when the optical axis (center of the beam) of the incident beam 103 and the output beam 104 is developed on a straight line. FIG. FIG. 5A shows an output beam 10.
FIG. 5B is a plan view of the optical axis No. 4 as viewed from a direction perpendicular to a plane formed during scanning (hereinafter referred to as a scanning plane).
FIG. 4 is a side view as viewed from a direction parallel to a scanning plane.

The outgoing beam 104 is transmitted to the rotating polygon mirror 12.
Since the reflection direction differs depending on the position of the reflection surface 120a in the rotation direction of 0, its optical axis also changes with the rotation of the reflection surface 120a, but the optical axis of the outgoing beam 104 in FIG. The optical axis of the main scanning beam 105 reaching the center of the main scanning line 107 of the photoconductor 200 is shown.

As shown in FIGS. 5A and 5B,
The incident beam 103 emitted in a substantially conical shape from the semiconductor laser 112 is converted into a parallel beam by the collimator lens 113 (the incident beam 103 that has become a parallel beam).
Has a substantially circular cross section in the direction perpendicular to the optical axis). Thereafter, the incident beam 103 passes through the concave lens 114 and is diffused by the concave lens 114 to become a diffuse beam having a substantially circular cross section in a direction perpendicular to the optical axis. Next, concave lens 1
The incident beam 103 that has passed through passes through an opening 115a provided in the opening plate 115, and becomes a diffused beam having a rectangular cross section in a direction perpendicular to the optical axis.

After that, the incident beam 103 enters the cylindrical lens 116. Cylindrical lens 1
According to FIG. 16, as shown in FIG. 5A, the direction of the incident beam 103 parallel to the generatrix of the cylindrical lens 116 continues to be diffused, and the direction of the incident beam 103 perpendicular to the generatrix of the cylindrical lens 116 converges. Can be changed to

After that, as shown in FIG. 5A, the incident beam 103 passes through the end of the fθ lens 123, is converted into a beam parallel to the scanning plane by the fθ lens 123, and is reflected by the rotating polygon mirror 120. At 120a, the light is incident as a beam parallel to the scanning plane.

Further, as shown in FIG.
03 enters the fθ lens 123 obliquely upward from obliquely downward, and enters the reflecting surface 120 a of the rotating polygon mirror 120.
It is incident as a convergent beam. The convergence line at which the incident beam 103 converges is near the center in the height direction of the reflecting surface 120a of the rotary polygon mirror 120.

The shape of the incident beam 103, which is perpendicular to the optical axis, is larger than the width of the reflecting surface 120a of the rotating polygon mirror 120 in the rotating direction, and is a beam shaped into an elongated rectangle. As one of the spins,
Different portions of the incident beam 103 are reflected to form an outgoing beam 104 directed in different directions.

The outgoing beam 104 formed by being reflected by the reflecting surface 120a of the rotary polygon mirror 120 remains a parallel beam in a direction parallel to the scanning plane, and diffuses after passing through a converging line in a direction perpendicular to the scanning plane. Beam, fθ
Head to lens 123. The outgoing beam 104 passes through the fθ lens 123 from obliquely downward to obliquely upward, and in a direction parallel to the scanning surface, is formed as a convergent beam so as to converge on the surface of the photoconductor 200, and in a direction perpendicular to the scanning surface, It remains a diffuse beam.

After that, the beam corresponding to the main scanning beam of the outgoing beam 104 is turned back by the outgoing turning mirror 124, reflected by the cylindrical mirror 125, and travels toward the photosensitive member 200. Cylindrical mirror 12
The incident beam 104 reflected by 5 remains a convergent beam in a direction parallel to the scanning surface, and is changed to a converging beam converging on the photoconductor 200 in a direction perpendicular to the scanning surface.

As described above, the output beam 104 is
A beam spot 10 having a predetermined size is placed on the photoreceptor 200.
8 will be connected.

The fθ lens 123 serves, in addition to the role described above, a beam spot 108 when the photoreceptor 200 is irradiated with the outgoing beam 104 moving at a constant angular velocity by the constant angular velocity movement of the rotary polygon mirror 120. Is also converted to move at a constant linear speed on the main scanning line.

(Over-Field Emission Optical System) As a method of writing image information on an electrostatic latent image carrier such as a photosensitive member using a laser beam, a method called an under-field emission optical system has conventionally been used in many cases. Was.
However, in recent years, a method called an overfield emission optical system has been developed for the purpose of making the optical system compact and reducing the rotational load of the polygon mirror in the optical system.

The overfield emission optical system is significantly different from the conventional underfield emission optical system. That is, irradiation of image information to a polygon mirror rotating at a high speed in the optical system (hereinafter referred to as an incident optical system)
In the underfield emission optical system, the irradiation area (corresponding to one surface) of the irradiation light (parallel light) to the polygon mirror when performing the light irradiation is irradiated to the overfield emission optical system. Is different in that it has an irradiation width for irradiating an adjacent surface other than the region (corresponding to one surface).

Therefore, when the overfield emission optical system is used, the polygon mirror is placed on the electrostatic latent image carrier on which the light emitted from the specified area (corresponding to one surface) forms an image. Unwanted image information from adjacent surfaces may be included as noise.

For this reason, in the present embodiment, by taking measures against stray light of the optical system in order to remove the noise,
It solves the practical problems of the over-field emission optical system, and makes the polygon mirror 120 in the optical scanning device compact, high-speed, and improves the accuracy (the polygon mirror 12).
0 surface accuracy).

(Supporting Structure of Reflecting Member) Next, a description will be given of a supporting structure of the exit turning mirror 124 to which such a stray light countermeasure (stray light preventing treatment) is applied. As shown in FIGS. 6 to 9, an output turning mirror (hereinafter simply referred to as a mirror)
Hemispherical lower support member 2 for supporting the lower portion of
21 is provided on a frame 222 of the optical scanning device 22. The lower support member 221 makes point contact with the lower portion of the mirror 124 so that the lower surface of the mirror 124 slides on the surface of the lower support member 221 when finely adjusting the angle of the mirror 124 as described later. It has become.

Thus, the mirror 124 is vertically mounted on the hemispherical upper surface of the lower supporting member 221, and the upper surfaces of both ends of the mirror 124 are fixedly mounted on both sides of the frame 222. The mirror 124 is supported in a state where it is elastically urged downward by upper holding members 224 and 224 attached to the upper portions of the members 223 and 223.

The upper holding member 224 is formed of a thin metal plate or the like, and its tip is bent slightly downward as shown in the figure, whereby a downward biasing force is constantly applied to the mirror 124. It is made to let.

Further, as shown in FIG. 7, a rear support member 225,
226 are supporting members 223 erected on the frame 222.
223 fixedly provided.

That is, the fulcrum member 22 is attached to the rear support member 225 corresponding to one end (right side in the figure) of the mirror 124.
7 and a first adjusting member (screw) 228 are provided, and a second adjusting member (screw) 229 is provided on a rear support member 226 corresponding to the other end side (left side in the figure) of the mirror 124. 124, the fulcrum member 227, the first
It is supported at three points by the adjusting member 228 and the second adjusting member 229.

On the other hand, as shown in FIG. 6, both ends of the mirror 124 face the rear side (corresponding to the support on the rear side (three-point support)) as shown in FIG. Front pressing members 230 and 231 are provided for urging (pressing). That is, one end side (the left side in FIG. 6) of the mirror 124 has a fulcrum member 227, a first adjustment member 228 on the back side, and a front surface made of a resilient plate member formed in a substantially U-shape in the lateral direction. The other side (the right side in FIG. 6) is sandwiched by the first front pressing member 230 on the side, and the second adjusting member 229 on the rear side and a second elastic plate member on the front side. Front holding member 23
1 pinched.

The first and second adjusting members 228, 229
Is composed of a screw (screw), and the front pressing members 230 and 2
The angle of the mirror 124 can be finely adjusted by screwing the screw forward and backward in response to the urging force of 31.

That is, the first and second front pressing members 230 and 231 supporting the front surface of the mirror 124, the fulcrum member 227 supporting the rear surface of the mirror 124, the first adjusting member 228, and the second adjusting member 229. When the screw of the first adjustment member 228 is screwed and retracted in a state where the mirror is supported at three points, the mirror 124 is moved to the mirror 124 with the tip of the fulcrum member 227 as a fulcrum (A) as shown in FIG. Can be finely adjusted in the vertical direction (α).

When the screw of the second adjusting member 229 is screwed and retracted, the mirror 124 moves between the tip of the fulcrum member 227 and the tip of the first adjusting member 228 as shown in FIG. ), The angle (β) in the longitudinal direction of the mirror 124 can be finely adjusted.

Therefore, in this embodiment, the fθ lens 12
3 (121 + 122), the light beam irradiated to the mirror 124 so as to be expanded in the sub-scanning direction is applied to the first and second front pressing members 230 provided on the reflection surface side of the mirror 124. 231 to prevent stray light from occurring.

That is, as shown in FIG. 6, the surfaces of the first and second front pressing members 230 and 231 are coated with a black paint that easily absorbs light, or a black coloring film or the like is applied. The first and second front pressing members 23 for irradiating the light beam.
The generation of stray light on the surface of 0,231 can be effectively prevented.

Thus, the distal ends of the first and second front pressing members 230 and 231 are positioned close to the effective reflection area EL of the mirror 124 (that is, FIG. 12 showing a conventional example).
In addition, in FIG. 13, even if the arrangement is L = 0), the image is not hindered. Therefore, unlike the related art, the mirror 124 does not need to be lengthened, and the optical scanning device 22 can be downsized. Can be.

[0069]

As apparent from the above description, the present invention has the following effects.

According to the first aspect, the surface of the front pressing member that supports the front side of the reflecting member is provided with a stray light preventing measure. Therefore, the front pressing member is provided close to the effective reflection area of the reflecting member. Can be. Accordingly, it is not necessary to make the reflection member extra long as in the related art, and the size of the optical scanning device can be reduced. Disturbing effects can be prevented, and image quality can be improved.

According to the second aspect, as the stray light preventing measure,
Since the black paint is applied, the front holding member can be prevented from stray light by a simple surface treatment.

According to the third aspect, since the reflection member is used as the emission turning member in the optical scanning device, the size of the emission turning member of the optical scanning device can be reduced, and
The posture of the output turning member can be easily adjusted from the side.

According to the fourth aspect, in the image forming apparatus, image defects such as ghosts due to the influence of stray light do not occur on the photosensitive drum, and the image forming apparatus is used to adjust the accommodation section and the attitude of the optical scanning device. There is no need to provide a space in the vertical direction, and the image forming apparatus can be made compact.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an image forming system according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of the main part.

FIG. 3 is a perspective view showing a configuration of the optical scanning device.

FIG. 4 is a perspective view showing the same component arrangement and an optical path.

FIG. 5 is an explanatory diagram of the optical path.

FIG. 6 is a front view showing a support structure of the reflection member.

FIG. 7 is a rear view of the same.

FIG. 8 is a plan view of the same.

FIG. 9 is a diagram corresponding to the bottom surface.

FIG. 10 is an explanatory diagram of posture adjustment of the reflection member.

FIG. 11 is another explanatory diagram of the same.

FIG. 12 is a front view showing a conventional support structure for a reflection member.

FIG. 13 is a plan view of the same.

[Explanation of symbols]

 22-optical scanning device 124-reflecting member 225,226-rear supporting member 230,231-front pressing member

 ────────────────────────────────────────────────── ─── Continued from the front page (72) Inventor Tetsuya Nishiguchi 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka F-term (reference) 2C362 AA42 AA45 AA48 BA83 BA87 BA90 DA03 DA26 DA29 2H043 BC02 BC08 2H045 AA01 CB63 DA02 5C051 AA02 CA07 DB02 DB22 DB24 DB30 DC04 DC07 FA01 5C072 AA03 BA11 HA02 HA09 HA13 HA20 XA01 XA05

Claims (4)

[Claims] 1. A laser beam scanning device using an overfield emission method for writing read image information on an electrostatic latent image carrier, wherein a reflection member for reflecting laser light comprises a front holding member and a rear support. An optical scanning device, wherein the optical scanning device is supported in a holding state in which the posture can be adjusted by a member, and a stray light preventing measure is applied to a surface of the front pressing member. 2. The optical scanning device according to claim 1, wherein a black paint is applied to a surface of the front pressing member as a stray light preventing measure. 3. The optical scanning device according to claim 1, wherein the reflection member is used as an emission turning member in the optical scanning device. 4. An image forming apparatus comprising the optical scanning device according to claim 1.