JP2001255481A - Optical scanner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an inexpensive optical scanner having a loading failure preventive mechanism of a sealing member without causing a loss on a customer. SOLUTION: When an engagement part 63 of a bent piece 61 is disengaged from the edge of a hole part 66A, a spring 72 is elongated to push out a shutter member 70 toward the direction of an arrow B, and the optical path of a laser beam 60 made incident on a pickup mirror 62 is interrupted by the interrupting part 74 of the shutter member 70. Thus, synchronous detection is impossible because the laser beam 60 does not reach the synchronous detecting sensor 64 when the seal glass 58 inserted in the holder 59 is removed from a housing 66. Thereby, a synchronous detecting sensor 64 cannot output a synchronous detection signal, and an image forming device 12 stops. Because the customer is not made to notice the loading failure of the seal glass 58 by a mistake copy, the loss is not given on the customer.

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 used for an image forming apparatus such as a digital copying machine and a laser printer.

[0002]

2. Description of the Related Art In a conventional optical scanning device used for an image forming apparatus such as a digital copying machine or a laser printer, a seal member which is disposed near a photoconductor and transmits a laser beam is disposed near an exposure position on the photoconductor. The toner is contaminated by a discharge product generated from the charged charging device, a toner cloud generated in the vicinity of the developing device, dust entering from outside the image forming device, and the like.

For this reason, the seal member can be cleaned to prevent a decrease in the amount of exposure light on the photoreceptor. To facilitate cleaning of the seal member, the seal member is detachably attached to the optical scanning device. I have.

On the other hand, in Japanese Patent Application Laid-Open No. H10-58750, a laser beam is applied to a photoconductor of an optical scanning device when a sealing member detachably mounted near the photoconductor of the optical scanning device is removed from the optical scanning device. A shutter is provided to close the opening through which the light passes.

If the image forming apparatus is operated while the shutter closes the opening, the shutter blocks the laser beam from irradiating the photoreceptor, resulting in a blank copy. For this reason, the customer notices that the user has forgotten to attach the seal member, but the customer loses due to miscopying.

A light detection sensor for detecting the open / closed state of the shutter is provided, and a mirror 204 for guiding a laser beam 202 to a synchronization detection sensor 200 is attached to a shutter 206 as shown in FIG. Apart from the laser beam 210, the laser beam 2 is transmitted to the synchronization detection sensor 200 in a state where the shutter 206 is closed.
There is also a method of stopping the image forming apparatus by detecting the closed state of the shutter by, for example, making 02 incident, and preventing the seal member from being forgotten to be attached to the optical scanning device.

However, a light detection sensor for detecting the open / closed state of a shutter provided in the optical scanning device is provided, or a laser is supplied to the synchronization detection sensor separately from a mirror for guiding a laser beam to the synchronization detection sensor when the shutter is open. Since a mirror for guiding the beam is provided, the number of components increases, and the cost of the optical scanning device increases.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described circumstances, and has as its object to provide an optical scanning apparatus having a mechanism for preventing forgetting to attach a seal member at a low cost without causing loss to a customer.

[0009]

According to the first aspect of the present invention, the housing has an opening through which a laser beam for irradiating the image carrier passes, and this opening can be closed by a seal member. It has become.

[0010] Further, a synchronization detecting means is housed in the housing, and a laser beam is incident on the synchronization detecting means. When the sealing member is removed from the housing, an optical path of the laser beam toward the synchronization detecting means is obtained. Is blocked by the blocking means.

As described above, by providing the blocking means for blocking the optical path of the laser beam toward the synchronization detecting means, the laser beam does not reach the synchronization detecting means when the seal member is not attached to the housing. Synchronization cannot be detected.

Therefore, the synchronization detecting means cannot output the synchronization detection signal, and the image forming apparatus stops. As described above, since the image forming apparatus is stopped, unlike the case where the optical path of the laser beam for irradiating the image carrier is interrupted, the misprint does not remind the customer of forgetting to attach the seal member. No loss is given.

According to the second aspect of the present invention, the housing is provided with a detachable reflecting member for reflecting the laser beam to the synchronization detecting means. The reflection member regulates the movement of the seal member when the seal member is removed from the housing, and cannot be attached unless the seal member is attached to the housing.

For this reason, unless the reflection member is removed, the seal member cannot be removed from the housing, and cannot be mounted unless the seal member is mounted on the housing. The reflecting member cannot be attached to the housing even though it is not attached to the housing.

Therefore, when the sealing member is removed from the housing, the reflection member is also removed from the housing, so that the laser beam does not reach the synchronization detecting means and synchronization cannot be detected. The synchronization detection unit cannot output the synchronization detection signal, and the image forming apparatus stops.

As described above, the reflecting member itself can be attached to and detached from the housing, and the presence or absence of the sealing member can be detected by the presence or absence of the reflecting member.
Since there is no need to separately provide a member for interrupting the optical path of the laser beam incident on the synchronization detecting means, the number of parts does not increase and the operation can be performed at low cost.

According to the third aspect of the present invention, the sealing member and the reflecting member are provided integrally, and the reflecting member reflects the laser beam to the synchronization detecting means in a state where the sealing member is attached to the housing. .

As described above, since the sealing member and the reflecting member are provided integrally, when the sealing member is mounted on the housing, the reflecting member is also necessarily mounted on the housing, and the sealing member is removed from the housing. In the detached state, the reflection member is always removed from the housing.

In addition, there is no need to remove or attach the sealing member and the reflecting member from the casing, respectively, as in claim 2, and the sealing member and the reflecting member can be easily attached to and detached from the casing.

According to the fourth aspect of the present invention, the cleaning means is provided on the movement locus of the seal member. When the seal member moves, the cleaning member slides to clean the surface of the seal member.

The purpose of removing the seal member is to clean the seal member. Therefore, when the seal member is moved, the seal member slides on the cleaning means to clean the surface of the seal member. Since it is not necessary to remove the member from the housing and clean it, it is inevitable to forget to attach the seal member.

[0022]

FIG. 1 shows an example of an image forming apparatus 12 such as a digital copying machine and a laser printer using an optical scanning device 10 according to the present embodiment.

In the image forming apparatus 12, three rollers 14, 16, and 18 are disposed, and an endless belt 20 is stretched. The endless belt 20 is conveyed at a constant speed in a direction indicated by an arrow in the figure by a drive motor (not shown).

On the upper surface side of the endless belt 20, four drum shafts (not shown) are disposed in a direction perpendicular to the conveying direction, and a plurality of photosensitive drums 22 (image carriers) are arranged at predetermined intervals. Are located.

Here, the photosensitive drums 22 are for yellow, magenta, cyan and black recording, respectively.
Above each photoconductor drum 22, an optical scanning device 10 for performing recording corresponding to the color is arranged.

As shown in FIG. 2, the photosensitive drum 22
The charge corotron 24 uniformly applies the surface potential. Therefore, when the laser beam of the optical scanning device 10 scans the surface of the photosensitive drum 22, an electrostatic latent image is formed on the surface of the photosensitive drum 22.

The electrostatic latent image formed on the surface of the photosensitive drum 22 becomes a toner image developed by the developing device 26. This toner image is transferred from the surface of the photosensitive drum 22 to the surface of the endless belt 20 by the transfer corotron 28. On the other hand, the toner remaining on the surface of the photosensitive drum 22 after the transfer is collected by the cleaning device 30.

With the above structure, four color toner images of yellow, magenta, cyan and black are formed on the surface of the endless belt 20 shown in FIG. The transfer of the yellow, magenta, cyan, and black toner images formed on the surface of the endless belt 20 to paper (not shown) is performed.

Downstream of the photosensitive drum 22 in the transport direction,
A color misregistration detection sensor 32 is provided, and the color misregistration detection sensor 32 detects a color misregistration inspection pattern transferred from the photosensitive drum 22 of each color on the upper surface of the endless belt 20.

The optical scanning device 10 of the image forming apparatus 12 is controlled based on the color misregistration information of the color misregistration detection sensor 32, and the color misregistration of the four color toner images formed on the surface of the endless belt 20 is minimized. Can be

The paper (not shown) on which the toner images of the respective colors have been transferred in this manner is peeled off from the surface of the endless belt 20 and is fixed by a fixing device (not shown). Exhausted from above.

On the other hand, the optical scanning device 10 of the image forming apparatus 12
Are arranged corresponding to yellow, magenta, cyan, and black. As shown in FIGS. 2 and 3, the laser beam 36 emitted from the light source of the semiconductor laser 34 passes through a collimator lens 38 and a spherical lens 40 and enters a mirror 42.

The mirror 42 controls the laser beam 36.
Is reflected and transmitted through the cylinder lens 44, and then sequentially reflected by mirrors 46 and 48. Next, the laser beam 36 passes through the F-θ lens 50 and enters the rotary polygon mirror 52.

The laser beam 36 in the image range reflected by the rotary polygon mirror 52 passes through the F-θ lens 50 and is reflected by the mirrors 48 and 54 sequentially. Next, the laser beam 36 is reflected by the cylindrical mirror 56, passes through a seal glass 58 (seal member) described later, and is converged on the photosensitive drum 22. The laser beam 36 converged on the photosensitive drum 22 optically scans the surface of the photosensitive drum 22 in the axial direction by the rotation of the rotary polygon mirror 52.

On the other hand, the laser beam 60 outside the image range reflected by the rotary polygon mirror 52 passes through the F-θ lens 50 and is sequentially reflected by the mirrors 48 and 54. Next, the laser beam 36 is sequentially reflected by a cylindrical mirror 56 and a pickup mirror 62 (reflection member) described later, and is incident on a synchronization detection sensor 64 (synchronization detection means).

As a result, a synchronization detection signal is output,
A laser beam 36 modulated based on the image signal is emitted from the light source of the semiconductor laser 34 in synchronization with the synchronization detection signal.

Next, the optical scanning device 10 according to the first embodiment will be described.

As shown in FIG. 4, the photosensitive drum 22 (see FIG. 2) is provided on the bottom plate of the housing 66 of the optical scanning device 10.
The opening 68 through which the laser beam 36 in the image range for irradiating the laser beam passes is formed.

A plate-shaped holder 59 is mounted in the opening 68, and a highly transparent sealing glass 58 is fitted in the frame of the holder 59. The sealing glass 58 is formed by a discharge product generated near the charge corotron 24 shown in FIG. 2, a toner cloud generated near the developing device 26, or dust entering from outside the image forming apparatus 12 through the opening 68. This prevents image quality degradation caused by adhering to optical components in the housing 66.

On the other hand, a pair of steps 68A are provided in the opening 68 along the longitudinal direction, and guided by the step 68A and the peripheral wall 68B of the opening 68, the holder 59 moves with respect to the housing 66 with an arrow. It is slidable in the A direction. One end of the holder 59 is tapered, and the bent piece 61 is folded back.

A gap is provided between the facing surfaces 59A and 61A, and an elastic force is applied to the bent piece 61. An engaging portion 63 is formed at the tip of the bent piece 61 toward the outside of the bent piece 61 so as to be able to engage with an edge of a hole 66A formed in a wide plate of the housing 66. Has become.

For this reason, the holder 59 is pushed inward of the hole 66A to bend the bent piece 61 toward the facing surface 59A. When the engaging portion 63 passes through the edge of the hole 66A, the bent piece 61 is bent. To restore.

As a result, the engaging portion 63 is engaged with the edge of the hole 66A, and the seal glass 58 is positioned with respect to the housing 66 with the holder 59 attached to the housing 66.

When the holder 59 is removed from the housing 66, the bent piece 61 is bent toward the facing surface 59A to disengage the engaging portion 63 from the edge of the hole 66A. Is pulled out of the housing 66 and removed.

On the other hand, as shown in FIGS. 5A and 5B,
A pressing piece 59B protrudes from the other end of the holder 59, and an abutting portion 78 described below can abut. The pickup mirror 62 is arranged on the extension line of the holder 59 in the longitudinal direction at a distance from the end face of the holder 59.

The pickup mirror 62 reflects the laser beam 60 reflected by the cylindrical mirror 56 (see FIG. 3) and makes the laser beam 60 incident on the synchronization detection sensor 64. A shutter member 70 is provided between the pickup mirror 62 and the synchronization detection sensor 64, and one end of a spring 72 is in contact with the shutter member 70.

The other end of the spring 72 is connected to the housing 66.
And urges the shutter member 70 in the direction of arrow B. Guide walls (not shown) are provided on both side surfaces of the shutter member 70 to guide the movement of the shutter member 70.

Here, the shutter member 70 is provided with a blocking portion 74 for blocking the optical path of the laser beam 60,
, And a contact portion 78 that can contact the tip surface of the seal glass 58.

As shown in FIG. 5A, the engaging portion 63 of the bent piece 61 is engaged with the edge of the hole 66A, and
In the state where 9 is attached to the housing 66, the contact portion 78 is pressed by the pressing piece 59 </ b> B of the holder 59, and the spring 72 contracts. In this state, the shutter member 7 is provided between the pickup mirror 62 and the synchronization detection sensor 64.
The laser beam 60 incident on the pickup mirror 62 is reflected and incident on the synchronization detection sensor 64.

On the other hand, as shown in FIG. 5B, when the engaging portion 63 of the bent piece 61 is disengaged from the edge of the hole 66A, the spring 72 expands and the shutter member 70 is moved in the direction of arrow B. Extrude in the direction.

In this state, a blocking portion 74 of the shutter member 70 is disposed between the pickup mirror 62 and the synchronization detection sensor 64, and the laser beam 60 incident on the pickup mirror 62 has a light path blocked by the blocking portion 74. Is done.

As described above, the holder 59 is mounted on the housing 6.
When the laser beam 60 is removed from the synchronous detection sensor 64, the optical path of the laser beam 60 toward the synchronization detection sensor 64 is cut off, and the laser beam 60 does not reach the synchronization detection sensor 64, so that the synchronization cannot be detected.

For this reason, since the synchronization detection sensor 64 cannot output the synchronization detection signal, the image forming apparatus 12
Stops. As described above, when the seal glass 58 fitted in the holder 59 is removed from the housing 66, the image forming apparatus 12 is stopped, so that the optical path of the laser beam 36 for irradiating the photosensitive drum 22 is blocked. As shown, the seal glass 58 is provided to the customer by miscopying.
It does not remind customers that they have forgotten to wear it, so there is no loss to the customer.

In this case, the long hole 76 is formed in the shutter member 70 to transmit the laser beam 60. However, it is sufficient that the laser beam 60 can be transmitted. It may be fitted.

Although the holder 59 is provided with the bent piece 61 and the engaging portion 63 and attached to the housing 66, the present invention is not limited to this as long as the holder 59 can be attached to the housing 66.

Next, an optical scanning device according to a second embodiment will be described. The description of the same contents as in the first embodiment is omitted.

As shown in FIGS. 6, 7A and 7B, an opening 81 is formed in the bottom plate of the housing 83 of the optical scanning device 79. A holder 82 in which a seal glass 80 is fitted is detachably attached to the opening 81.

A notch 96 is formed at one end of the holder 82 along the longitudinal direction in accordance with the length of a mirror holder 86 described later. A guide groove 98 is formed on a surface facing the notch 96 along the sliding direction of the holder 82 (the direction of arrow C).

On the other hand, the mirror holder 86 has a rectangular parallelepiped shape, and a pickup mirror 84 is attached to the top surface. Further, a protrusion 94 protrudes from the side surface of the mirror holder 86 along the longitudinal direction.
Can be engaged with the guide groove 98 formed in the groove.

Here, the length H1 from the bottom surface 98A of the guide groove 98 to the back surface of the holder 82 is equal to the length of the mirror holder 8.
The length from the back surface 94A of the projection 94 to the back surface of the mirror holder 86 is longer than H2.

For this reason, when the mirror holder 86 is attached to the holder 82, a gap is provided between the back surface of the mirror holder 86 and the receiving portion 93 provided on the entrance side of the hole 83A of the wide plate. . Therefore, when the holder 82 is not attached to the housing 83, the mirror holder 86 is directly placed on the receiving portion 93, and is located below the fixed position.

Incidentally, the tongue 8 is provided on the mirror holder 86.
The tongue 88 is provided with a hole 88A so that a fixing screw 90 can be inserted therethrough. on the other hand,
A mounting piece 92 is connected to the receiving portion 93, and a screw hole 92A is formed in the mounting piece 92 so that a fixing screw 90 can be screwed therein.

With the mirror holder 86 attached to the holder 82, the axis of the hole 88A of the tongue 88 and the axis of the screw hole 92A of the mounting piece 92 are aligned. For this reason, when the holder 82 is not attached to the housing 83, the mirror holder 86 is located below the fixed position, so that the axis of the hole 88A and the screw hole 92A are displaced, and the mirror holder 86 is displaced. It cannot be mounted on the mounting piece 92.

Therefore, although the holder 82 in which the sealing glass 80 is fitted is not attached to the housing 83, the mirror holder 86 to which the pickup mirror 84 is attached is attached to the housing 83 via the attachment piece 92. Never.

A leaf spring 100 fixed to the housing 83 is in contact with the other end of the holder 82, and pushes the holder 82 in the direction of removing the holder 82 from the housing 83 (the direction of arrow D). For this reason, the holder 82
The holder 82 is pushed back only by sliding the back of the hole 83A.

Accordingly, after the holder 82 is slid to the rear of the hole 83A, the protrusion 94 of the mirror holder 86 is slid along the guide groove 98 of the holder 82,
The mirror holder 8 moves in the direction against the urging force of the leaf spring 100.
6 and the holder 82 are pushed in, and the tongue 88 of the mirror holder 86 is in contact with the mounting piece 92.
To fix the mirror holder 86 to the housing 83 via the mounting piece 92. Thereby, the pickup mirror 8
4 is positioned with respect to housing 83.

On the other hand, when removing the holder 82 from the housing 83, the holder 82 cannot be slid in the direction of arrow D unless the mirror holder 86 is removed from the housing 83.

With the above configuration, the holder 82 cannot be removed from the housing 83 unless the mirror holder 86 is removed. If the holder 82 is not attached to the housing 83, the mirror holder 86 cannot be attached.

Therefore, when the seal glass 80 fitted in the holder 82 is removed from the housing 83, the pickup mirror 84 attached to the mirror holder 86 is also removed from the housing 83.

Therefore, the sealing glass 80 is
2, the laser beam 60 does not reach the synchronization detection sensor 64 shown in FIG. 2 and synchronization cannot be detected. Therefore, the synchronization detection sensor 64 cannot output a synchronization detection signal, and image formation is not performed. The device (see FIG. 1) stops.

As described above, the pickup mirror 84 itself can be attached to and detached from the housing 83, and the presence or absence of the seal glass 80 can be detected by the presence or absence of the pickup mirror 84.

With such a configuration, FIG.
As in the first embodiment shown in (B), there is no need to separately provide a shutter member 70 for interrupting the optical path of the laser beam 60 incident on the synchronization detection sensor 64. Can be implemented at cost.

Here, the projecting portion 94 is connected to the guide groove 9.
By providing a gap between the back surface of the mirror holder 86 and the receiving portion 93 of the housing 83 in a state where the mirror holder 86 is engaged with the housing 8, the mirror holder 86 alone cannot be attached to the housing 83. In a state where the mirror holder 86 is not attached to the housing 83, the mirror holder 86 is not limited to this, as long as the mirror holder 86 cannot be attached to the housing 83.

Next, a modification of the optical scanning device according to the second embodiment will be described. The description of the same contents as in the second embodiment is omitted.

As shown in FIG. 8, a seal glass 104 and a pickup mirror 106 are mounted on the holder 102, and the seal glass 104 and the pickup mirror 106 are integrally formed.

For this reason, when the pickup mirror 106 is attached to the housing (not shown), the seal glass 104 is always attached to the housing. When the seal glass 104 is detached from the housing, the pickup mirror 106 is always detached from the housing.

Therefore, unlike the second embodiment shown in FIGS. 7A and 7B, there is no need to remove or attach the seal glass 80 and the pickup mirror 84 from the housing 83, respectively. Can be easily attached to and detached from the housing.

Next, an optical scanning device according to a third embodiment will be described. The description of the same contents as in the first and second embodiments is omitted.

As shown in FIG. 9, an opening 111 formed in the bottom plate of the housing 109 of the optical scanning device 107 has
The seal glass 108 is detachable. A pickup mirror 110 formed of a reflective film is adhered to one end of the seal glass 108. Further, a grip portion 113 is provided on the other end side of the seal glass 108, and the seal glass 108 is slid while holding the grip portion 113.

On the other hand, a pedestal 114 is provided on the entrance side of the hole 109A formed in the wide plate of the housing 109. A pair of cleaners 112 formed of a sponge material are placed on the pedestal 114. This cleaner 11
2 is fixed to the base 114 by the fixing member 116.

This cleaner 112 is used for sealing glass 108.
When the seal glass 108 is slid, the seal glass 108 slides on the cleaner 112, and the surface of the seal glass 108 is cleaned.

Since the purpose of removing the seal glass 108 is to clean the seal glass 108, when the seal glass 108 is slid, the cleaner 112 is removed.
The seal glass 108 is thus cleaned, so that it is not necessary to remove the seal glass 108 from the housing 109 and clean it, so that it is inevitable to forget to attach the seal glass 108.

In the first to third embodiments, a seal glass has been described as an example of a seal member for closing an opening through which a laser beam emitted from the optical scanning device to the photosensitive drum passes. The present invention is not limited thereto, and can be applied to a lens.

Further, the pickup mirror has been described as an example of the reflection member for guiding the laser beam outside the image range to the synchronization detection sensor. However, the present invention is not limited to this. Applicable to all mirrors.

[0085]

According to the present invention, the laser beam does not reach the synchronization detecting means when the sealing member is not attached to the housing, and the synchronization is detected. Cannot be performed, and the image forming apparatus stops because the synchronization detection means cannot output the synchronization detection signal. As described above, since the image forming apparatus is stopped, unlike the case where the optical path of the laser beam for irradiating the image carrier is interrupted, the misprint does not remind the customer of forgetting to attach the seal member. No loss is given. According to the second aspect of the present invention, when the seal member is removed from the housing, the reflection member is also removed from the housing, so that the image forming apparatus stops. In this way, the reflection member itself can be attached to and detached from the housing, and the presence or absence of the sealing member can be detected based on the presence or absence of the reflection member. Since there is no need to separately provide a member for interrupting the optical path of the beam, the number of components does not increase and the operation can be performed at low cost. According to the third aspect of the present invention, when the seal member is attached to the housing, the reflection member is always attached to the housing. When the seal member is removed from the housing, the reflection member is also attached to the housing. Removed from Further, there is no need to remove or attach the sealing member and the reflecting member from the housing, respectively, as in the second aspect, and the sealing member and the reflecting member can be easily attached to and detached from the housing. According to the fourth aspect of the present invention, there is no need to remove and clean the seal member from the housing, so that forgetting to attach the seal member can be inevitably prevented.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of an image forming apparatus.

FIG. 2 is an explanatory diagram of an optical system of the optical scanning device.

FIG. 3 is a schematic perspective view of an optical system of the optical scanning device.

FIG. 4 is a perspective view showing a seal member and a blocking unit attached to the optical scanning device according to the first embodiment.

FIG. 5A is used in the optical scanning device according to the first embodiment.
FIG. 3B is a cross-sectional view illustrating a state in which the seal member is attached to the housing of the optical scanning device and the laser beam is guided to the synchronization detection unit. FIG.
FIG. 4 is a cross-sectional view showing a state where a laser beam guided to a synchronization detecting unit is blocked.

FIG. 6 is a perspective view showing a seal member and a reflection member attached to the optical scanning device according to the second embodiment.

FIG. 7A is a perspective view showing a state in which a seal member and a reflection member attached to the optical scanning device according to the second embodiment are attached to a housing, and FIG. It is a perspective view showing the state where a reflection member was removed from a case.

FIG. 8 is a modified example of the optical scanning device according to the second embodiment, and is a perspective view showing a state in which a sealing member and a reflecting member attached to the optical scanning device are integrally formed.

FIG. 9 is a perspective view showing a state in which a cleaning unit is provided on a seal member attached to the optical scanning device according to the third embodiment.

FIG. 10 is an explanatory diagram of an optical system of a conventional optical scanning device.

[Explanation of symbols]

 Reference Signs List 10 optical scanning device 12 image forming device 58 seal glass (seal member) 62 pickup mirror (reflective member) 64 synchronization detection sensor (synchronization detection unit) 66 housing (housing) 70 shutter member (blocking unit) 72 spring (blocking unit) 74 Blocking part (blocking means) 78 Contact part (blocking means) 79 Optical scanning device 80 Seal glass (seal member) 83 Housing (housing) 84 Pickup mirror (reflective member) 104 Seal glass (seal member) 106 Pickup mirror ( (Reflective member) 107 Optical scanning device 108 Seal glass (seal member) 109 Housing (housing) 110 Pickup mirror (reflective member) 112 Cleaner (cleaning means)

Claims (4)

[Claims] 1. A housing provided with an opening through which a laser beam for irradiating an image carrier passes, a seal member capable of closing the opening, and a synchronization accommodated in the housing and receiving the laser beam. An optical scanning device comprising: a detection unit; and a blocking unit configured to block an optical path of the laser beam toward the synchronization detection unit when the seal member is removed from the housing. 2. A housing provided with an opening through which a laser beam for irradiating the image carrier passes, a seal member capable of closing the opening, and a laser beam received in the housing and incident on the housing. Synchronization detection means, provided detachably on the housing, reflects the laser beam to the synchronization detection means, regulates movement of the seal member when removing the seal member from the housing, the seal member is An optical scanning device comprising: a reflecting member that cannot be attached unless it is attached to a body. 3. A housing provided with an opening through which a laser beam for irradiating the image carrier passes, a seal member capable of closing the opening, and a synchronization accommodated in the housing and receiving the laser beam. An optical scanning device, comprising: a detection unit; and a reflection member provided integrally with the seal member and reflecting the laser beam to the synchronization detection unit in a state where the seal member is attached to the housing. 4. A housing provided with an opening through which a laser beam for irradiating the image carrier passes, a seal member capable of closing the opening, and a seal member provided on a movement path of the seal member When the seal moves, the seal member slides,
An optical scanning device comprising: a cleaning unit that cleans a surface of a seal member.