JP2019219567A - Optical scanner and image forming apparatus - Google Patents

Abstract

To provide an optical scanner that allows front incidence from a direction orthogonal to a rotation axis of a reflection member to ensure vignetting margin, can minimize a bow, and can be reduced in thickness and size in the direction of rotation axis of the reflection member.SOLUTION: An optical scanner comprises: a light source 10 that radiates beam light L including a first polarization component; and a reflection member 30 that reflects the beam light L toward a body to be scanned. On a light path PO between the light source 10 and reflection member 30, a first polarizing member 21 that reflects the first polarization component and transmits a second polarization component having a phase difference with respect to the first polarization component, and a second polarizing member 22 that causes a phase difference to occur in the first polarization component reflected by the first polarizing member 21 and makes the second polarization component incident on the first polarizing member 21, are arranged.SELECTED DRAWING: Figure 3

Description

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

  2. Description of the Related Art Conventionally, there has been known an optical scanning device that includes an optical system including a light source and a reflection member, and scans an object to be scanned with a light beam from the light source.

  An optical scanning device often employs a light beam layout in which a light beam is incident obliquely not from the front of the reflection member but from the side in order not to obstruct the emitted light beam reflected by the reflection member.

  Further, the optical scanning device needs to secure a vignetting margin that allows an error in the irradiation position of the light beam with respect to the reflection member in order to prevent the light beam from coming off the reflection member.

JP-A-60-205419

  However, in the light beam layout in which the light beam is obliquely incident on the reflecting member from the side, the effective area of the reflecting surface becomes narrow depending on the angle of the reflecting member, and it is difficult to secure the vignetting margin. In particular, when a MEMS mirror is used as a reflection member, the mirror size in the main scanning direction is smaller than that of a polygon mirror.

  As a layout different from the above-described light beam layout, a light beam layout in which a light beam is incident from the front of the reflection member at an angle to the rotation axis of the reflection member is also known. According to this light ray layout, the light beam is incident from the front of the reflection member, so that a vignetting margin can be secured.

  However, in the light beam layout in which the light beam is incident at an angle with respect to the rotation axis of the reflection member, since the light path of the light beam also extends in the rotation axis direction of the reflection member, the thickness of the optical scanning device increases. is there. Further, since the reflection position of the light beam is different between the image height center and the scanning end, there is also a problem that the sub-scanning line bending (bow) of the reflected light beam occurs.

  Patent Literature 1 discloses a light beam layout in which a prism and a quarter-wave plate form an optical path of light beam from lower incidence to upper incidence. However, in this light ray layout, optical axes are provided vertically in the rotation axis direction of the reflection member. For this reason, the thickness of the reflection member in the rotation axis direction is required, and there is a problem that the thickness of the optical scanning device increases.

  An object of the present invention is to enable front incidence from a direction perpendicular to the rotation axis of the reflection member, to ensure vignetting margin, minimize bow, and reduce the thickness and size of the reflection member in the rotation axis direction. It is an object of the present invention to provide an optical scanning device which can be integrated and an image forming apparatus provided with the same.

The optical scanning device of the present invention includes:
A light source for irradiating a beam light including a first polarization component;
A reflecting member for reflecting the light beam toward the object to be scanned,
With
On an optical path between the light source and the reflecting member,
A first polarizing member that reflects the first polarized light component and transmits a second polarized light component having a phase difference with respect to the first polarized light component;
A second polarizing member that causes a phase difference between the first polarized light component reflected by the first polarizing member and causes the second polarized light component to enter the first polarizing member;
(First configuration).

  According to the above configuration, the first polarization member and the second polarization member are arranged on the optical path between the light source and the reflection member, and the first polarization member reflects the first polarization component and converts the second polarization component. The second polarization member transmits the first polarization component and causes a phase difference in the first polarization component reflected by the first polarization member. For this reason, front incidence from a direction orthogonal to the rotation axis of the reflection member is possible, and a vignetting margin can be secured and bow can be minimized. Further, the optical scanning device can be made thinner and smaller in the rotation axis direction of the reflection member.

In the first configuration,
The first polarizing member includes:
The beam light reflected by the first polarizing member is disposed so as to be incident on the reflecting member in front from substantially the center of the deflection angle of the reflecting member,
The second polarizing member,
It may be arranged between the first polarizing member and the reflecting member (second configuration).

  According to the above configuration, the first polarizing member is arranged such that the light beam reflected by the first polarizing member is incident on the reflecting member in front from substantially the center of the deflection angle of the reflecting member. Therefore, the vignetting margin can be maximized.

In the first or second configuration,
The first polarizing member includes:
It may be arranged at a position where the light beam reflected by the reflection member is transmitted (third configuration).

  According to the above configuration, the first polarizing member is disposed at a position where the light beam reflected by the reflecting member is transmitted. Therefore, the size of the optical scanning device can be reduced.

In any one of the first to third configurations,
An emission lens that emits the light beam reflected by the reflection member toward the object to be scanned,
The first polarizing member includes:
It may be arranged between the reflection member and the exit lens (fourth configuration).

  According to the above configuration, the first polarizing member is disposed between the reflecting member and the exit lens. Therefore, the size of the optical scanning device can be reduced.

In the fourth configuration,
The first polarizing member includes:
A reflection point for reflecting the light beam emitted from the light source may be disposed closer to the reflection member than a midpoint of an optical path from the reflection member to the emission lens (fifth configuration). ).

  According to the above configuration, the first polarizing member is disposed such that the reflection point for reflecting the beam light emitted from the light source is located closer to the reflection member than the midpoint of the optical path from the reflection member to the emission lens. I have. Therefore, the first polarizing member can be reduced in size, and the optical scanning device can be reduced in thickness and size.

In any one of the first to fifth configurations,
An optical axis of the light beam reflected by the first polarizing member, an optical axis of the light beam reflected by the reflecting member, and a light transmitted through the first polarizing member on a plane including a scanning surface for scanning the object to be scanned. The first polarizing member and the reflecting member may be arranged such that the optical axis of the light beam is substantially included (sixth configuration).

  According to the above configuration, the optical axis of the light beam reflected or transmitted by the first polarizing member and the reflecting member is substantially included in the plane including the scanning surface that scans the object to be scanned. Therefore, the optical scanning device can be made thinner and smaller.

In any one of the first to sixth configurations,
The first polarizing member includes:
The transmitted second polarized light component may be arranged so as to face the device housing (seventh configuration).

  According to the above configuration, the first polarizing member is disposed so that the transmitted second polarized light component is directed toward the device housing. Therefore, it is possible to prevent the second polarization component transmitted through the first polarization member from being incident on the reflection member.

In the seventh configuration,
The device housing,
A reduction unit configured to reduce reflection of the second polarization component transmitted through the first polarization member may be provided (an eighth configuration).

  According to the above configuration, the reduction unit reduces the reflection of the second polarization component transmitted through the first polarization member. For this reason, it is possible to suppress the second polarization component from being scattered and becoming stray light.

  The image forming apparatus of the present invention includes the optical scanning device having any one of the first to eighth configurations (a ninth configuration).

  According to the above configuration, the first polarization member and the second polarization member are arranged on the optical path between the light source and the reflection member, and the first polarization member reflects the first polarization component and converts the second polarization component. The second polarization member transmits the first polarization component and causes a phase difference in the first polarization component reflected by the first polarization member. For this reason, frontal incidence from a direction orthogonal to the rotation axis of the reflection member becomes possible, and the vignetting margin can be ensured and the bow can be minimized. Further, the optical scanning device can be made thinner and smaller in the rotation axis direction of the reflection member.

  According to the optical scanning device and the image forming apparatus of the present invention, frontal incidence from a direction orthogonal to the rotation axis of the reflection member is enabled, vignetting margin can be secured, bow can be minimized, and reflection member It is possible to reduce the thickness and size in the direction of the rotation axis.

FIG. 1 is a longitudinal sectional view schematically illustrating an overall configuration of an image forming apparatus to which an optical scanning device according to a first embodiment is applied. FIG. 2 is a diagram schematically illustrating a configuration around a photosensitive drum in the image forming apparatus. FIG. 2 is a plan view schematically showing an optical system of the optical scanning device. FIG. 2 is a plan view schematically showing an optical system of the optical scanning device. FIG. 4 is a view taken in the direction of arrow A in FIG. 3. FIG. 4 is a view taken in the direction of arrow B in FIG. 3. FIG. 9 is a plan view schematically showing an optical system of the optical scanning device according to the second embodiment. FIG. 9 is a plan view schematically showing an optical system of an optical scanning device according to a third embodiment.

[Embodiment 1]
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a vertical cross-sectional view schematically illustrating an overall configuration of an image forming apparatus 200 to which the optical scanning device 100 according to the first embodiment is applied. An image forming apparatus 200 shown in FIG. 1 is a digital multifunction peripheral capable of printing a document read by a scanner 81 or printing image data input from an external device via a network.

  The image forming apparatus 200 includes a photosensitive drum 60, a charging unit 62, a cleaning unit 64, an optical scanning device 100, a developing unit 74, a transfer unit 75, a fixing unit 76, a scanner 81, a paper feed tray 82, and a paper discharge tray 83. ing.

  The scanner 81 includes a document set tray, an automatic document feeder, a document reading device, and the like. The document reading device includes a document table and a document scanning device.

  The paper feed tray 82 is a tray for storing recording paper such as plain paper, coated paper, color copy paper, and OHP film. A plurality of paper feed trays 82 are provided, and each paper feed tray 82 stores, for example, recording papers having different sizes. The recording sheet on which the image is formed is discharged to the discharge tray 83.

  FIG. 2 is a diagram schematically illustrating a configuration around the photosensitive drum 60 in the image forming apparatus 200 (see FIG. 1). As shown in FIG. 2, a charging unit 62, a cleaning unit 64, an optical scanning device 100, a developing unit 74, a transfer unit 75, and a fixing unit 76 are provided around the photosensitive drum 60.

  The photoconductor drum 60 is a roller-shaped member provided to be rotatable in the direction of arrow R1. On the surface of the photosensitive drum 60, a photosensitive film on which an electrostatic latent image and a toner image are formed is formed.

  The charging unit 62 charges the outer peripheral surface of the photoconductor drum 60 to a predetermined polarity and potential. The charging section 62 of the present embodiment is a charging roller 63. The charging roller 63 charges the photosensitive drum 60 by contacting the outer peripheral surface of the photosensitive drum 60.

  The cleaning unit 64 removes residual toner remaining on the outer peripheral surface of the photosensitive drum 60. The cleaning section 64 includes a cleaning blade 65.

  The optical scanning device 100 (see FIG. 1) irradiates the charged photosensitive drum 60 with a light beam L corresponding to image data. An electrostatic latent image corresponding to the image data is formed by the light beam L applied to the outer peripheral surface of the photosensitive drum 60.

  The developing unit 74 supplies toner to the outer peripheral surface of the photosensitive drum 60, and visualizes the electrostatic latent image formed on the outer peripheral surface of the photosensitive drum 60 as a toner image.

  The transfer unit 75 applies a transfer bias from the back surface of the recording paper P passing between the photosensitive drum 60 and the transfer unit 75, and transfers the visualized toner image on the outer peripheral surface of the photosensitive drum 60 to the recording paper P. .

  The fixing unit 76 melts and fixes the toner image transferred to the recording paper P by heating and pressing the recording paper P passing through the fixing nip.

  FIG. 3 is a plan view schematically showing the optical system of the optical scanning device 100. The optical scanning device 100 causes the light beam L emitted from the light source 10 to enter from the front of the reflecting member 30 and reflects the incident light beam L toward the front of the reflecting member 30 to scan the object to be scanned (photosensitive drum). 60) is an optical scanning device for scanning. In the following drawings, the main scanning direction of the light beam L is defined as the X-axis direction, the sub-scanning direction of the light beam L orthogonal to the main scanning direction (X-axis direction) is defined as the Y-axis direction, and the main scanning direction (the X-axis direction). Direction) and the sub-scanning direction (Y-axis direction), the height direction of the rotating shaft 33 of the reflecting member 30 is defined as the Z-axis direction.

  As shown in FIG. 3, the optical scanning device 100 includes a light source 10, a collimating lens 12, a cylindrical lens 14, a first polarizing member 21, a second polarizing member 22, a reflecting member 30, and an emission lens 40. In the present embodiment, by using the first polarizing member 21 and the second polarizing member 22, the light beam L can be made incident on the reflecting member 30 from the front.

  The light source 10 emits a light beam L according to the input image data. As the light source 10, for example, an LD (Laser Diode) or an LED (Light Emitting Diode) can be used. In the present embodiment, an LD is used as the light source 10, and the rotation is adjusted so that the S-polarized light component enters the first polarizing member 21. A polarization component having a phase difference of １ ／ wavelength with respect to the S polarization component is a P polarization component. The S-polarized light component corresponds to the first polarized light component of the present invention, and the P-polarized light component corresponds to the second polarized light component of the present invention.

  The collimator lens 12 is an optical member that converts the conical light beam L emitted from the light source 10 into a parallel light beam.

  The cylindrical lens 14 is an optical member that condenses the light beam L converted into parallel light by the collimator lens 12 in the sub-scanning direction.

  The first polarizing member 21 is an optical member that reflects one of the polarization components included in the light beam L and transmits the other. The first polarizing member 21 is disposed between the reflection member 30 and the emission lens 40 and on the optical path PO between the light source 10 and the reflection member 30. Further, the first polarizing member 21 is disposed at a position where the light beam L reflected by the reflecting member 30 is transmitted. As the first polarizing member 21, for example, a wire grid polarizing film, a dielectric multilayer film, or the like can be used. In the present embodiment, a wire grid polarizing film is used as the first polarizing member 21. The wire grid polarizing film can change the polarized component to be reflected and transmitted depending on the arrangement direction. The first polarizing member 21 is installed in a direction that reflects the S-polarized component included in the light beam L and transmits the P-polarized component.

  The second polarizing member 22 is an optical member that causes a phase difference in the S-polarized light component reflected by the first polarizing member 21. The second polarizing member 22 is disposed on the optical path PO between the light source 10 and the reflecting member 30 and between the first polarizing member 21 and the reflecting member 30. As the second polarizing member 22, for example, a λλ wavelength plate can be used. The λλ wavelength plate is a wavelength plate having a function of generating a 差 wavelength phase difference in the incident light beam L. In the present embodiment, the S-polarized light component is transmitted to the second polarizing member 22 twice to change the S-polarized light component to the P-polarized light component. The change from the S-polarized component to the P-polarized component will be described later in detail.

  The reflection member 30 is an optical member that reflects the light beam L toward the scanned object (photosensitive drum 60). As the reflection member 30, for example, a MEMS mirror, a polygon mirror, or the like can be used. In the present embodiment, a MEMS mirror 32 is used as the reflection member 30. The MEMS mirror 32 has a mirror 34 that is driven to rotate about a rotation axis 33. By rotating the mirror 34 to change the direction in which the light beam L is reflected, the light beam L can be scanned. The deflection angle (optical deflection angle) of the mirror 34 is defined as an angle θ.

  The emission lens 40 is a lens that emits the light beam L reflected by the reflection member 30 toward the scanned object (photosensitive drum 60). As the emission lens 40, for example, an Fθ lens or a θless lens can be used.

  Next, the change from the S-polarized light component to the P-polarized light component by the second polarizing member 22 will be described. FIG. 4 is a plan view schematically showing the optical system of the optical scanning device 100. In FIG. 4, the light beam L is shown by the optical axis (LA1, LA2, LA3, LA4, LA5, and LA6). The optical axis LA1 is the optical axis of the light beam L reflected by the first polarizing member 21, and the optical axis LA2 is the light axis of the light beam L transmitted through the second polarizing member 22 from the first polarizing member 21 side to the reflecting member 30 side. The optical axis and the optical axis LA3 are the optical axis of the light beam L reflected by the reflecting member 30, and the optical axis LA4 is the light beam L transmitted through the second polarizing member 22 from the reflecting member 30 side to the first polarizing member 21 side. Is the optical axis of the light beam L transmitted through the first polarizing member 21, and the optical axis LA6 is the optical axis of the light beam L emitted from the emission lens 40. The optical axis LA6 forms a scanning surface LH that scans the scanned object (photosensitive drum 60).

  As shown in FIG. 4, the S-polarized light component (optical axis LA1) reflected by the first polarizing member 21 is transmitted to the second polarizing member 22 from the first polarizing member 21 side to the reflecting member 30 side to be 1 /. A phase difference of four wavelengths occurs (optical axis LA2, S + ／ λ). The light beam L (optical axis LA3, S + ／ λ) transmitted through the second polarizing member 22 and reflected by the reflecting member 30 transmits again the second polarizing member 22 from the reflecting member 30 side to the first polarizing member 21 side. By doing so, a further phase difference of 波長 wavelength occurs (optical axis LA4, S + ／ λ). A polarization component having a phase difference of １ ／ wavelength with respect to the S polarization component is a P polarization component. That is, by transmitting the S-polarized light component twice through the second polarizing member 22, the S-polarized light component is changed to the P-polarized light component. Since the first polarizing member 21 reflects the S-polarized component and transmits the P-polarized component, the light beam L (optical axis LA5) changed from the S-polarized component to the P-polarized component transmits through the second polarizing member 22. .

  As described above, in the present embodiment, the first polarizing member 21 reflects the S-polarized light component included in the light beam L and causes the reflected light to enter the second polarizing member 22. The first polarization member 21 transmits the S-polarized component reflected by the member 21 twice to change it to a P-polarized component, and the first polarizing member 21 transmits the beam light L changed to the P-polarized component. Can be made frontal incidence.

  Here, the arrangement of the first polarizing member 21 will be described in detail with reference to FIGS. 3, 4, 5, and 6. FIG. 5 is a view as viewed in the direction of the arrow A in FIG. 3, and FIG. 6 is a view as viewed in the direction of arrow B in FIG.

  As shown in FIG. 3, the first polarizing member 21 is arranged such that the light beam L reflected by the first polarizing member 21 is incident on the reflecting member 30 from the center of the deflection angle θ by the reflecting member 30. Have been. That is, assuming that a virtual bisector of the deflection angle θ by the reflecting member 30 is HL, the first polarizing member 21 reflects the light beam L reflected by the first polarizing member 21 in parallel with the bisector HL. 30 are arranged so as to be incident.

  As shown in FIGS. 5 and 6, the first polarizing member 21 is configured such that the optical axis LA1 (see FIG. 4) of the light beam L reflected by the first polarizing member 21 is orthogonal to the rotation axis 33 of the reflecting member 30. It is arranged to be. In other words, the light beam L reflected by the first polarizing member 21 enters from a direction orthogonal to the rotation axis 33 of the reflecting member 30. That is, the optical axis LA1 of the light beam L reflected by the first polarizing member 21 and the light beam L reflected by the reflecting member 30 are placed on a plane including the scanning surface LH that scans the object to be scanned (photosensitive drum 60). The first polarizing member 21 and the reflecting member 30 are arranged so as to substantially include the optical axis LA3 and the optical axis LA5 of the light beam L transmitted through the first polarizing member 21.

  As described above, the first polarizing member 21 causes the light beam L reflected by the first polarizing member 21 to move from the center of the deflection angle θ of the reflecting member 30 to the reflecting member 30 in a plan view (see FIG. 3). The light beam L reflected by the first polarizing member 21 is arranged such that the light beam L reflected by the first polarizing member 21 is perpendicular to the rotation axis 33 of the reflecting member 30 in a side view (see FIGS. 5 and 6). It is arranged to be incident. That is, the first polarizing member 21 is arranged at a position where the light beam L enters the reflecting member 30 from the front.

  Therefore, the effective area of the reflection surface (mirror 34) of the reflection member 30 can be maximized, and the vignetting margin can be secured, and the bow can be minimized. Further, the optical scanning device 100 can be made thinner and smaller in the direction of the rotation axis 33 of the reflection member 30.

  In the present embodiment, in the first polarizing member 21, the light beam L reflected by the first polarizing member 21 is orthogonal to the rotation axis 33 of the reflecting member 30 in a side view (see FIGS. 5 and 6). Although the first polarizing member 21 is arranged so as to be incident from a direction, the first polarizing member 21 may be arranged so as to be incident from a direction substantially orthogonal to the rotation axis 33 of the reflecting member 30. For example, it is preferable to dispose the first polarizing member 21 so that the light beam L is incident within a range of + -3 degrees with respect to a direction orthogonal to the rotation axis 33 of the reflecting member 30.

  As shown in FIG. 3, the first polarizing member 21 reflects the reflection point LRP that reflects the light beam L emitted from the light source 10 more than the middle point of the optical path PO from the reflection member 30 to the emission lens 40. It is preferable to be arranged so as to be located closer to the member 30. Specifically, the position where the light beam L (optical axis LA1, see FIG. 4) is reflected by the first polarizing member 21 is defined as the position of the reflection point LRP, and the distance of the optical path PO from the reflecting member 30 to the exit lens 40 is D1. The distance of the optical path PO from the reflecting member 30 to the reflection point LRP is D2, and the distance of the optical path PO from the reflection point LRP to the exit lens 40 is D3, so that D2 <D3 or D2 <D1 / 2. It is preferable to dispose the first polarizing member 21. By arranging the first polarizing member 21 in this manner, the first polarizing member 21 can be reduced in size, and the optical scanning device 100 can be reduced in thickness and size.

[Embodiment 2]
FIG. 7 is a plan view schematically showing the optical system of the optical scanning device 100A according to the second embodiment. In the optical scanning device 100A according to the second embodiment of the present invention, the light beam L emitted from the light source 110 contains an S-polarized component and a P-polarized component. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

  As shown in FIG. 7, the first polarizing member 121 is disposed between the reflection member 30 and the emission lens 40 and on the optical path PO between the light source 10 and the reflection member 30. The first polarizing member 121 is installed in a direction that reflects the S-polarized light component and transmits the P-polarized light component.

  The light beam L emitted from the light source 110 contains an S-polarized component and a P-polarized component. Therefore, the first polarizing member 121 reflects the S-polarized light component LS included in the light beam L toward the reflection member 30 and transmits the P-polarized light component LP included in the light beam L. The first polarizing member 121 is disposed so that the transmitted P-polarized light component LP is directed toward the device housing 50 of the optical scanning device 100A. The device housing 50 is provided with a reduction unit 52 that reduces the reflection of the P-polarized light component LP transmitted through the first polarizing member 121. For example, the reduction unit 52 may form minute unevenness on the inner wall of the device housing 50, or may provide a member formed of a suede material or the like.

  According to the optical scanning device 100 </ b> A according to the second embodiment, since the first polarization member 121 is disposed so that the transmitted P-polarized component LP is directed to the device housing 50, the first polarization member 121 transmits the first polarization member 121. The P-polarized component LP can be prevented from being incident on the reflection member 30. Further, since the reduction unit 52 reduces the reflection of the P-polarized light component LP transmitted through the first polarizing member 121, it is possible to suppress the P-polarized light component LP from being scattered and becoming stray light.

[Embodiment 3]
FIG. 8 is a plan view schematically showing an optical system of an optical scanning device 100B according to the third embodiment. In the optical scanning device 100B according to Embodiment 3 of the present invention, the first polarizing member 221 is formed so as to partially curve. By bending or bending a part of the first polarizing member 221, the first polarizing member 221 can be reduced in size, and the optical scanning device 100B can be reduced in thickness and size.

[Other embodiments]
The embodiment disclosed this time is an exemplification in all respects, and is not a basis for restrictive interpretation. Therefore, the technical scope of the present invention is not construed only by the embodiments described above, but is defined based on the description of the claims. The technical scope of the present invention includes all modifications within the meaning and scope equivalent to the claims.

  For example, in the description of the embodiment, the light beam L emitted from the emission lens 40 and scanned is a P-polarized component, but the optical system may be configured to scan with an S-polarized component. In this case, for example, the first polarizing member is installed in a direction that reflects the P-polarized light component included in the light beam L and transmits the S-polarized light component.

  In the description of the embodiment, the optical scanning device applied to the image forming apparatus has been described. However, the application of the optical scanning device is not limited to the image forming apparatus, and can be applied to various other uses. For example, the optical scanning device can be applied to an image display device such as a projector or a display that scans light to display an image.

  INDUSTRIAL APPLICABILITY The present invention can be applied to an optical scanning device and an image forming apparatus and an image display device including the same.

REFERENCE SIGNS LIST 100 light scanning device 200 image forming device 10 light source 21 first polarizing member 22 second polarizing member 30 reflecting member PO optical path

Claims (9)

A light source for irradiating a beam light including a first polarization component;
A reflecting member for reflecting the light beam toward the object to be scanned,
With
On an optical path between the light source and the reflecting member,
A first polarizing member that reflects the first polarized light component and transmits a second polarized light component having a phase difference with respect to the first polarized light component;
A second polarizing member that causes a phase difference between the first polarized light component reflected by the first polarizing member and causes the second polarized light component to enter the first polarizing member;
An optical scanning device characterized by disposing. The first polarizing member includes:
The light beam reflected by the first polarizing member is disposed so as to be incident on the reflecting member from substantially the center of the deflection angle of the reflecting member,
The second polarizing member,
Disposed between the first polarizing member and the reflecting member,
The optical scanning device according to claim 1. The first polarizing member includes:
It is arranged at a position that transmits the light beam reflected by the reflection member,
The optical scanning device according to claim 1. An emission lens that emits the light beam reflected by the reflection member toward the object to be scanned,
The first polarizing member includes:
Disposed between the reflecting member and the exit lens,
The optical scanning device according to claim 1. The first polarizing member includes:
A reflection point for reflecting the light beam emitted from the light source is disposed closer to the reflection member than a middle point of an optical path from the reflection member to the emission lens,
The optical scanning device according to claim 4. An optical axis of the light beam reflected by the first polarizing member, an optical axis of the light beam reflected by the reflecting member, and a light transmitted through the first polarizing member on a plane including a scanning surface for scanning the object to be scanned. The first polarizing member and the reflecting member are arranged so that the optical axis of the light beam is substantially included.
The optical scanning device according to claim 1. The first polarizing member includes:
The transmitted second polarization component is disposed so as to face the device housing.
The optical scanning device according to claim 1. The device housing,
A reduction unit configured to reduce reflection of the second polarization component transmitted through the first polarization member;
The optical scanning device according to claim 7.   An image forming apparatus comprising the optical scanning device according to claim 1.

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