JP4349027B2 - Image forming apparatus and print head - Google Patents

Description

  The present invention relates to an image forming apparatus such as an electrophotographic copying machine or a printer, and more particularly to an image forming apparatus mounted with an LED print head (LPH) for exposing a photosensitive member.

Conventionally, in an image forming apparatus such as a copying machine or a printer using an electrophotographic system, for example, a photosensitive member configured in a drum shape is uniformly charged, and the photosensitive member is controlled based on image information. To form an electrostatic latent image on the photoreceptor. The electrostatic latent image is developed with a developer holding a developer (toner) to form a toner image, and the toner image is transferred to a recording sheet and then fixed to form an image.
In recent years, in order to reduce the size of an image forming apparatus, an LED print head using an LED array as one of exposure means that does not require a mechanical drive mechanism and does not require a backlight like a liquid crystal element ( LPH) has been developed. Since this LPH is disposed in the vicinity of the developing device, the light irradiation surface of the LPH is easily contaminated with dust such as toner or dust. Therefore, in order to prevent image unevenness caused by such dirt, a cleaning device for cleaning the light irradiation surface may be provided.

  Here, as a conventional technique for cleaning the light irradiation surface of LPH, there is a technique for cleaning the light irradiation surface of the exposure device at a timing that does not affect the recording process of the recording unit (for example, see Patent Document 1). In addition, there is a technique for cleaning a light-emitting surface by a cleaning device when the charger is pulled out and stored (see, for example, Patent Document 2).

JP 11-338227 A (page 3-4) JP-A-5-286206 (page 2-3)

By the way, in the image forming apparatus equipped with LPH, when the cleaning surface of the LPH light irradiation surface is repeatedly applied by the cleaning device, dust such as toner and dust accumulates on the cleaning device, and the dust on the light irradiation surface is removed. As a result, the cleaning ability was lowered, and as a result, there was an inconvenience that dust remained on the light irradiation surface and image unevenness occurred. Further, since the cleaning device is provided outside the LPH, there is a problem that the image forming device is increased in size.
Therefore, the problem to be solved is to suppress the deterioration of the cleaning ability even if the cleaning of the light irradiation surface of the LED print head (LPH) is repeated many times, and to suppress the occurrence of image unevenness.
Another object is to reduce the size of an image forming apparatus equipped with an LPH equipped with a cleaning device.

  In addition, in the technique described in said patent document 1 and patent document 2, the effective technique for preventing the fall of the cleaning capability of a cleaning apparatus and the technique which aims at space saving of a cleaning apparatus are not disclosed.

  For this purpose, in the image forming apparatus of the present invention, a photoconductor, an exposure unit that exposes the photoconductor, an optical unit that forms an image of light emitted from the exposure unit on the surface of the photoconductor, and the optical unit And a cleaning means capable of reciprocating to clean the light irradiation surface of the means. The cleaning means is configured to be able to contact with and separate from the light irradiation surface of the optical means, and the edge contacts the light irradiation surface. A first cleaning member that is movable while contacting, and a second cleaning member that is configured to be able to contact and separate from the light irradiation surface of the optical means, and that is movable while a plane is in contact with the light irradiation surface. It is said. Here, the cleaning means is configured such that the first cleaning member contacts the light irradiation surface when moving in one direction, and the second cleaning member contacts the light irradiation surface when moving in a direction opposite to the one direction. Can be configured. At that time, the cleaning means may be configured such that the first cleaning member comes into contact with the light irradiation surface in the counter when moving in this one direction.

Further, the cleaning means is configured such that the first cleaning member and the second cleaning member abut against the light irradiation surface when moving in one direction, and the first cleaning member and the second cleaning member are moved when moving in the direction opposite to the one direction. It can also comprise so that a member may be spaced apart from a light irradiation surface. At that time, the cleaning means may be configured such that the first cleaning member is in counter contact with the light irradiation surface when moving in this one direction.
Furthermore, the cleaning means can be moved to the outside in the longitudinal direction of the optical means. In addition, the first cleaning member and the second cleaning member may perform a contact / separation operation outside the image area of the optical unit.

  In the image forming apparatus of the present invention, the optical unit that forms an image of light irradiated from the exposure unit that exposes the photosensitive member on the surface of the photosensitive member and the sweeping member that sweeps out the deposit on the light irradiation surface of the optical unit are applied. A cleaning means having a wiping member for wiping off deposits is provided. Here, the cleaning means can be configured such that the sweeping member is constituted by a plate-like body, and the edge of the sweeping member abuts on the light irradiation surface. The cleaning means can be configured such that the wiping member is a planar body, and the flat surface of the wiping member abuts on the light irradiation surface.

Further, the present invention is regarded as a print head, and the print head of the present invention forms an image of a light emitting diode array that is supported by a housing and exposes the photosensitive member, and light emitted from the light emitting diode array on the surface of the photosensitive member. A moving member that includes a lens member, a sweeping member whose edge can abut against the light irradiation surface of the lens member, and a wiping member whose plane can abut against the light irradiation surface of the lens member. The light irradiation surface is cleaned while being moved along the light irradiation surface of the member. Here, the sweeping member can be configured to contact the light irradiation surface when moving in at least one direction, and at least the wiping member to contact the light irradiation surface when moving in the direction opposite to the one direction. Further, the sweeping member and the wiping member can be configured to abut against the light irradiation surface when moving in one direction and to be separated from the light irradiation surface when moving in the direction opposite to this one direction.
Furthermore, the moving mechanism unit may be arranged inside the housing.

  As an effect of the present invention, it is possible to improve the cleaning capability of the light irradiation surface of the print head to maintain the formation of a clear image and to reduce the size of the image forming apparatus.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
[Embodiment 1]
FIG. 1 illustrates an image forming apparatus according to Embodiment 1 of the present invention. As shown in FIG. 1, the image forming apparatus according to the present embodiment includes a charging roller 11 that uniformly charges the surface of the photosensitive drum 10 around the photosensitive drum 10 that rotates at a constant speed in the direction of arrow A, and an image. An LED print head (LPH) 12 that exposes light controlled based on information, a developing device 13 that develops an electrostatic latent image formed on the photosensitive drum 10, and a transfer roller that transfers a toner image onto a recording paper 20 14 is provided with a cleaner 15 for removing the transfer residual toner from the photosensitive drum 10. The LPH 12 is disposed below the photosensitive drum 10.
Furthermore, a fixing device 16 is provided for heating and fixing the toner image transferred to the recording paper 20.

The charging roller 11 is configured by laminating conductive rubber or conductive sponge and conductive rubber. A power source (not shown) is connected to the charging roller 11, and a DC voltage or a voltage in which an AC voltage is superimposed on the DC voltage is supplied from the power source. The surface of the photosensitive drum 10 is uniformly charged with a constant voltage.
The LPH 12 is connected to the LPH drive unit 21. The LPH 12 irradiates light controlled by the LPH driving unit 21 based on the image data from the control unit 30 to form an electrostatic latent image on the photosensitive drum 10. The configuration of the LPH 12 will be described in detail later.

The developing device 13 includes a developing housing 22 that stores the developer and a developing roller 23 that carries and conveys the developer. The developing roller 23 carries the developer stored in the developing housing 22 and supplies toner to the photosensitive drum 10 while rotating in the direction of arrow B to form a toner image that visualizes the electrostatic latent image. To do.
The transfer roller 14 is configured by laminating conductive rubber or conductive sponge and conductive rubber, and is connected to a power source (not shown) and supplied with a DC voltage. Then, the toner image is transferred onto the recording paper 20 conveyed by the paper feed roller 31.

The fixing device 16 includes a pair of rollers including a heating roller 16a and a pressure roller 16b. The recording paper 20 to which the toner image has been transferred is conveyed to the fixing device 16, and is heated and pressurized when passing through the fixing device 16, and the toner image is fixed to the recording paper 20.
On the other hand, the cleaner 15 includes a cleaning blade 24 and a cleaner housing 25. The cleaning blade 24 is in contact with the rotation direction A of the photosensitive drum 10 in the counter direction, scrapes off the transfer residual toner remaining on the photosensitive drum 10 at the time of transfer, and stores it in the cleaner housing 25.

Next, the LPH 12 in the present embodiment will be described.
FIG. 2 is a cross-sectional view showing the configuration of the LPH 12. In FIG. 2, an LPH 12 sensitizes light from an LPH housing 40 as a support, a light emitting diode array (LED array) 41 as an example of an exposure unit that emits light controlled based on image information, and the LED array 41. A selfock lens array (SLA) 42 as an example of an optical unit that forms an image on the surface of the body drum 10 and a cleaning device 60 as an example of a cleaning unit that cleans the light irradiation surface 45 of the SLA 42 are provided.
The LPH housing 40 is formed of, for example, a sheet metal such as aluminum, and a housing main body 71, an LED array holding portion 72 that holds the LED array 41, and a lens holding portion 73 that holds the SLA 42 are integrally connected by bending. Configured. The LED array holding unit 72 and the lens holding unit 73 are configured so that the light emitting point of the LED array 41 and the focal point of the SLA 42 are aligned with each other.
The housing body 71 is bent into a “U” shape with the LED array holding portion 72 as one side. By bending in this way, it is possible to increase the vibration resistance strength of the LPH housing 40 in the optical axis direction of the SLA 42, so that it is possible to suppress the reduction of the sharpness of the image due to vibration and at the same time manufacture at a low cost. It becomes possible.

Next, the cleaning device 60 for the LPH 12 will be described. FIG. 3 is a side view of the LPH 12. As shown in FIGS. 2 and 3, the cleaning device 60 includes a support member 50 carried in the housing main body 71 of the LPH housing 40 of the LPH 12, a rail portion 51 provided in the longitudinal direction of the support member 50, and a rail portion. The sliding member 53 is slidably supported by the sliding member 51, the cleaning rod 52 extends in the longitudinal direction of the supporting member 50, the cleaning member 62 that cleans the light irradiation surface 45, and the swing member 61 that supports the cleaning member 62. Yes.
Here, in the cleaning device 60, in the LPH housing 40, the main part of the cleaning device 60 is disposed in the “U” -shaped internal space of the housing main body 71, and only the swing member 61 is the outer portion of the LPH housing 40. Are arranged. That is, as shown in FIG. 2, the cleaning device 60 supports the support member 50 provided with the rail portion 51, the cleaning rod 52, the cleaning rod support member (not shown), and the swing member 61. The slide member 53 constitutes a moving mechanism portion and is stored inside the housing main body portion 71. Further, the swing member 61 provided with the cleaning member 62 is disposed outside the LPH housing 40. With this configuration, the LPH 12 can be configured in a small size, and the LPH 12 can be disposed in a limited space around the photoconductor drum 10, so that the image forming apparatus can be easily downsized.

  The support member 50 is disposed in the housing main body 71 of the LPH housing 40 along the longitudinal direction of the LPH housing 40. Therefore, the rail portion 51 provided on the support member 50 is positioned in parallel with the light irradiation surface 45. Further, the cleaning bar 52 is slidably supported by a cleaning bar support member (not shown) supported on one end of the support member 50, and the other is slidably supported on the rail part 51. It is connected. In other words, the cleaning rod 52 and the slide member 53 are integrally movable along the rail portion 51, and the slide member 53 is exposed to the exposure region (image region) of the light irradiation surface 45 as the cleaning rod 52 moves. ) Can be reciprocated within a certain range.

The swing member 61 is pivotally supported by the slide member 53 and is configured to swing within a predetermined range in the longitudinal direction of the LPH housing 40. Further, the swing member 61 is connected to the cleaning rod 52 and swings in accordance with the sliding direction of the cleaning rod 52. That is, in FIG. 3, when the cleaning rod 52 slides in the direction of the left (arrow C) in FIG. 3, the swinging member 61 tilts in the direction of the left (arrow E) of the drawing, and the cleaning rod 52 moves in the direction of the right (arrow D) of the drawing. When sliding, it is configured to incline in the right direction of the drawing (arrow F).
Further, as shown in FIG. 4, the swing member 61 has a substantially “L” cross section, and the cleaning member 62 provided on the swing member 61 is felt on the surface 62 a protruding in the SLA 42 direction. A wiping member (second cleaning member) 63 made of (nonwoven fabric) and a sweeping member (first cleaning member) 64 made of a plate-like elastic body such as Mylar are disposed (see also FIG. 3). . The swinging member 61 swings within a range where the sweeping member 64 of the cleaning member 62 provided on the swinging member 61 contacts the light irradiation surface 45 and at the same time the wiping member 63 is separated. Between the position where the wiping member 63 comes into contact with the light irradiation surface 45 at the same time.

FIG. 5 is a diagram illustrating a contact state between the cleaning member 62 and the light irradiation surface 45 when the cleaning device 60 is slid. 5A shows a case where the cleaning device 60 is moved in the right direction (arrow D) in the drawing, and FIG. 5B shows a case where the cleaning device 60 is moved in the left direction (arrow C) in the drawing. As shown in FIG. 5A, when the cleaning device 60 moves in the right direction of the drawing (arrow D), the sweeping member 64 of the cleaning member 62 contacts the light irradiation surface 45 while the wiping member 63. Swing member 61 swings away from light irradiation surface 45. In accordance with the movement of the cleaning member 62, the sweeping member 64 is configured to move while being in counter contact with the light irradiation surface 45 on the upstream side of the wiping member 63.
On the other hand, as shown in FIG. 5B, when the cleaning device 60 moves in the left direction of the drawing (arrow C), the sweeping member 64 of the cleaning member 62 is separated from the light irradiation surface 45. The swing member 61 swings so that the wiping member 63 contacts the light irradiation surface 45. As the cleaning member 62 moves, the wiping member 63 is configured to move while sliding on the light irradiation surface 45.

Here, the cleaning operation when the cleaning member 62 of the cleaning device 60 cleans the light irradiation surface 45 will be described. 6 (1) and (2) show a case where the cleaning member 62 moves in the right (D) direction of the drawing, and in FIGS. 6 (3) and (4), the cleaning member 62 moves in the left (C) direction of the drawing. Shows the case.
In the configuration shown in FIG. 3, when the cleaning member 62 moves in the right direction (D direction) in the drawing, the swinging member 61 swings in the arrow F direction as the cleaning rod 52 is pulled in the right direction in the drawing. (See also FIG. 5 (a)). In this case, as shown in FIGS. 6 (1) and 6 (2), the sweeping member 64 comes into contact with the light irradiation surface 45 in the counter direction on the upstream side of the wiping member 63 and the image area of the light irradiation surface 45 is reached. Slide in the area containing. On the other hand, the wiping member 63 is positioned away from the light irradiation surface 45. Then, the cleaning member 62 sweeps the toner, dust, and the like adhering to the light irradiation surface 45 to the end of the light irradiation surface 45 while the sweeping member 64 slides on the light irradiation surface 45, as shown in FIG. As described above, the toner, dust, and the like swept by the sweeping member 64 are collected from the light irradiation surface 45 into a collection box (not shown).

  Further, in the configuration shown in FIG. 3, when the cleaning member 62 moves in the left direction (C direction) in the drawing, the swinging member 61 moves in the direction of arrow E as the cleaning rod 52 is pushed in the left direction in the drawing. It swings (see also FIG. 5B). In this case, as shown in FIGS. 6 (3) and 6 (4), the wiping member 63 contacts the light irradiation surface 45 so as to rub the region including the image region of the light irradiation surface 45. The member 64 comes into contact with the light irradiation surface 45 in the width direction on the downstream side of the wiping member 63. Then, as shown in FIG. 6 (4), the cleaning member 62 wipes off the remaining toner, dust, etc. that the wiping member 63 slides on the light irradiation surface 45 but cannot be swept away by the sweeping member 64.

Thus, in the cleaning device 60 provided in the LPH 12 in the present embodiment, when the cleaning device 60 moves from the home position toward the other end, the sweeping member 64 is located upstream of the wiping member 63. The region including the image region of the light irradiation surface 45 is slid in contact with the light irradiation surface 45 in the counter direction, and the toner, dust, etc. adhering to the light irradiation surface 45 are swept to the end of the light irradiation surface 45. . On the other hand, when moving in the direction toward the home position, the wiping member 63 comes into contact with the light irradiation surface 45 so as to rub, so that the cleaning member 64 can wipe off the remaining toner and dust. It is configured.
As described above, when moving in one direction, the sweeping member 64 sweeps most of the toner, dust and the like adhering to the light irradiation surface 45 to the end, and when moving in the opposite direction, the wiping member 63 Since the light irradiation surface 45 is rubbed and a small amount of toner and dust left by the sweeping member 64 are wiped off, the amount of dust such as toner and dust accumulated in the wiping member 63 is extremely reduced, and the cleaning ability is maintained over a long period of time. As a result, the frequency of replacement of the wiping member 63 can also be reduced.

  Here, the remaining state of dust when the cleaning device 60 cleans the light irradiation surface 45 is compared. FIG. 7 is a diagram for comparing the remaining state of dust when the cleaning member 62 of the cleaning device 60 cleans the light irradiation surface 45. FIG. 7A shows a case where a conventional cleaning device composed of only the wiping member 63 slides on the light irradiation surface 45 in both the right direction (outward) and the left direction (return) in the drawing. (B) is the case of the cleaning device 60 of the present embodiment, in which the sweeping member 64 abuts on the light irradiation surface 45 in the forward path, and the wiping member 63 slides on the light irradiation surface 45 in the return path. Represents.

  As shown in FIG. 7A, in the conventional cleaning device, the wiping member 63 moves in the forward path while rubbing against the light irradiation surface 45, and wipes off dust on the light irradiation surface 45 outside the image area. (FIG. 7 (a) (1)), the dust that has accumulated as the wiping member 63 moves while sliding on the light irradiation surface 45 in the return path is pulled back together with the wiping member 63 (FIG. 7 (a) (2) )), The light irradiation surface 45 is soiled (FIGS. 7A and 3). Such a phenomenon appears remarkably by repeating the cleaning operation many times.

  On the other hand, in this embodiment, as shown in FIG. 7B, first, on the forward path, the dust on the light irradiation surface 45 is swept out by the member 64 (FIGS. 7B and 1). (2)). Then, on the return path, the wiping member 63 moves while rubbing the light irradiation surface 45 (FIGS. 7B and 3). Therefore, most of the dust on the light irradiation surface 45 is wiped out of the image area by the sweeping member 64 (FIGS. 7B and 2), and the wiping member 63 wipes only a small amount of remaining dust (FIG. 7). (B) (3)). Thus, since a large amount of dust is not accumulated in the wiping member 63, dust does not adhere to the light irradiation surface 45 again in the return path, and the light irradiation surface 45 is not soiled. In particular, by moving the sweeping member 64 to the outside in the longitudinal direction of the SLA 42, the dust accumulated on the sweeping member 64 can be removed from the SLA 42, so that accumulation of dust on the wiping member 63 can be prevented as much as possible. .

  The operation of bringing the cleaning member 62 into contact with or separating from the light irradiation surface 45 is performed in a state where the cleaning member 62 is located outside the range of the image area. In particular, when the cleaning member 62 is separated from the light irradiation surface 45, there is a high possibility that dust accumulated on the cleaning member 62 will remain on the light irradiation surface 45, so the cleaning member 62 is positioned outside the range of the image area. It is necessary to do it in a state where

In this embodiment, a mechanical mechanism is used as means for bringing the cleaning member 62 into and out of contact with the light irradiation surface 45, but it can also be brought into and out of contact with an electromagnetic mechanism.
Furthermore, the movement of the slide member 53 is manually performed by the cleaning rod 52, but an electric drive means can also be used.

[Embodiment 2]
In the first embodiment, the cleaning device 60 provided in the LPH 12 is configured to reciprocate with respect to the light irradiation surface 45, and when moving in one direction, the sweeping member 64 is upstream of the wiping member 63. When the light irradiation surface 45 slides on the light irradiation surface 45 in the counter direction and moves in the opposite direction, the wiping member 63 contacts the light irradiation surface 45 so as to rub. The image forming apparatus configured to wipe off the toner and dust on the light irradiation surface 45 has been described. In the second embodiment, the cleaning device 60 provided in the LPH 12 is configured to reciprocate with respect to the light irradiation surface 45. When the cleaning device 60 moves in one direction, the sweeping member 64 and the wiping member 63 simultaneously emit light. An image forming apparatus configured so that the sweeping member 64 and the wiping member 63 are both separated from the light irradiation surface 45 when sliding on the irradiation surface 45 and moving in the opposite direction will be described. In addition, about the structure similar to Embodiment 1, the same code | symbol is used and the detailed description is abbreviate | omitted here.

The LPH 12 cleaning device 80 used in the image forming apparatus according to the second embodiment of the present invention will be described. FIG. 8 is a diagram for explaining a contact state between the cleaning member 62 and the light irradiation surface 45 when the cleaning device 80 in the present embodiment is slid. FIG. 8A shows a case where the cleaning device 80 is moved in the left direction (arrow C) in the drawing, and FIG. 8B shows a case where the cleaning device 80 is moved in the right direction (arrow D) in the drawing.
First, as shown in FIG. 8, the cleaning device 80 of the present embodiment is similar to the cleaning device 60 of the first embodiment in that the support member 50 is carried in the housing main body 71 of the LPH housing 40 of the LPH 12. A rail part 51 provided in the longitudinal direction of the support member 50, a slide member 53 slidably supported by the rail part 51, a cleaning rod 52 extending in the longitudinal direction of the support member 50, and a cleaning member for cleaning the light irradiation surface 45 62, and a swinging member 61 that supports the cleaning member 62. In the cleaning device 80, in the LPH housing 40, the main portion (moving mechanism) of the cleaning device 60 is disposed in the “U” -shaped internal space of the housing main body 71, and only the swing member 61 is the LPH housing. 40 on the outer side.

  Further, the cleaning rod 52 and the slide member 53 are integrally movable along the rail portion 51, and the slide member 53 includes a certain area including the image area of the light irradiation surface 45 as the cleaning rod 52 moves. It is possible to reciprocate within the range. In the present embodiment, the swing member 61 is pivotally supported by the slide member 53 and swings within a predetermined range in the longitudinal direction of the LPH housing 40. However, the swing member 61 is a cleaning rod. When 52 is slid in the left direction (arrow C), it tilts in the right direction (arrow G). When the cleaning rod 52 is slid in the right direction (arrow D), it is in the left direction (arrow H). It differs from the case of Embodiment 1 by the point comprised so that it may incline.

As shown in FIG. 8A, when the cleaning device 80 moves in the left direction of the drawing (arrow C), the sweeping member 64 and the wiping member 63 of the cleaning member 62 both come into contact with the light irradiation surface 45. The swing member 61 swings (in the direction of arrow G). As the cleaning member 62 moves, the light irradiation surface 45 is swept out by the sweeping member 64 and the wiping member 63 in contact with each other.
On the other hand, as shown in FIG. 8B, when the cleaning device 80 moves in the right direction of the drawing (arrow D), the sweeping member 64 and the wiping member 63 of the cleaning member 62 are both separated from the light irradiation surface 45. Thus, the swing member 61 swings (in the direction of arrow H). The cleaning member 62 is configured to move while being separated from the light irradiation surface 45.

Here, the cleaning operation when the cleaning member 62 of the cleaning device 80 cleans the light irradiation surface 45 will be described. 9 (1) and 9 (2) show the case where the cleaning member 62 moves in the left direction (C direction) in the drawing. In FIGS. 9 (3) and 4 (4), the cleaning member 62 moves in the right direction (D direction). ) Shows the case of moving.
In the configuration of the present embodiment, when the cleaning member 62 moves from the home position in the left direction (C direction) in the drawing, the swinging member 61 moves in the arrow G direction as the cleaning rod 52 is pushed in the left direction in the drawing. (See also FIG. 8A). In this case, as shown in FIGS. 9 (1) and 9 (2), the sweeping member 64 comes into contact with the light irradiation surface 45 in the counter direction on the upstream side of the wiping member 63 and the image area of the light irradiation surface 45 is reached. The wiping member 63 also comes into contact with the light irradiation surface 45 so as to rub. In the cleaning member 62, the sweeping member 64 sweeps the toner or dust attached to the light irradiation surface 45 to the end of the light irradiation surface 45 while sliding on the light irradiation surface 45. At this time, the wiping member 63 is a sweep member. The toner and dust left by 64 are wiped off and collected (FIG. 9 (2)).

  Further, in the configuration of the present embodiment, when the cleaning member 62 moves in the right direction (D direction) in the drawing, the swinging member 61 moves in the arrow H direction as the cleaning rod 52 is pulled in the right direction in the drawing. It swings (see also FIG. 8B). In this case, as shown in FIGS. 9 (3) and 9 (4), the sweeping member 64 and the wiping member 63 are separated from the light irradiation surface 45. Then, as shown in FIG. 9 (4), the cleaning member 62 returns to the home position in a state where the sweeping member 64 and the wiping member 63 are separated from the light irradiation surface 45.

Thus, in the cleaning device 80 provided in the LPH 12 in the present embodiment, when the cleaning device 80 moves from the home position toward the other end, the sweeping member 64 is located upstream of the wiping member 63. The toner or dust adhering to the light irradiation surface 45 is swept out to the end of the light irradiation surface 45 while coming into contact with the light irradiation surface 45 in the counter direction and sliding on the light irradiation surface 45. At the same time, the wiping member 63 is also in contact with the light irradiation surface 45, and the toner and dust left by the sweeping member 64 are wiped and collected. On the other hand, when moving in the direction toward the home position, the sweeping member 64 and the wiping member 63 are configured to return to the home position while being spaced apart from the light irradiation surface 45.
As a result, the sweeping member 64 sweeps most of the toner and dust adhering to the light irradiation surface 45 to the end, and a slight amount of toner and dust remaining by the sweeping member 64 is wiped off the light irradiation surface 45. Since rubbing and wiping is performed, the amount of dust such as toner and dust accumulated in the wiping member 63 is extremely reduced, and the cleaning ability can be maintained high over a long period of time. As a result, the frequency of replacing the wiping member 63 can also be reduced.
Further, after the toner and dust are swept out, the cleaning member 62 is moved away from the light irradiation surface 45, so that accumulated dust is not pulled back together with the cleaning member 62 (FIG. 9 (3)). The light irradiation surface 45 is not soiled. In particular, by allowing the cleaning member 62 to move to the outside in the longitudinal direction of the SLA 42, it is possible to prevent dust accumulated on the cleaning member 62 from being removed from the SLA 42, thereby preventing accumulation of dust on the cleaning member 62 as much as possible. .

  As an application example of the present invention, it can be applied to, for example, a print head that forms an electrostatic latent image by exposing a photosensitive drum in an image forming apparatus such as a copying machine or a printer using an electrophotographic system.

It is a figure explaining the image forming apparatus in Embodiment 1 of this invention. It is sectional drawing which shows the structure of LPH. It is a side view of LPH. It is a figure which shows the structure of a rocking | swiveling member. It is a figure explaining the contact state of the cleaning member and light irradiation surface at the time of sliding the cleaning apparatus in Embodiment 1. FIG. It is a figure explaining the cleaning operation | movement at the time of the cleaning member of the cleaning apparatus cleaning a light irradiation surface. It is a figure which compares the residual state of the dust at the time of the cleaning member of the cleaning apparatus cleaning a light irradiation surface. It is a figure explaining the contact state of the cleaning member at the time of sliding the cleaning apparatus in Embodiment 2, and a light irradiation surface. It is a figure explaining the cleaning operation | movement at the time of the cleaning member of the cleaning apparatus cleaning a light irradiation surface.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Photosensitive drum, 11 ... Charging roller, 12 ... LED print head (LPH), 13 ... Developing device, 14 ... Transfer roller, 15 ... Cleaner, 16 ... Fixing device, 40 ... LPH housing, 41 ... Light emitting diode array ( LED array), 42 ... Selfoc lens array (SLA), 45 ... light irradiation surface, 50 ... support member, 51 ... rail part, 52 ... cleaning rod, 53 ... slide member, 60 ... cleaning device, 61 ... swing member , 62 ... cleaning member, 63 ... wiping member (second cleaning member), 64 ... sweeping member (first cleaning member), 71 ... housing body, 72 ... LED array holding part, 73 ... lens holding part

Claims (9)

A photoreceptor,
Exposure means for exposing the photoreceptor;
Optical means for imaging light irradiated from the exposure means on the surface of the photoreceptor;
A first cleaning member having an edge capable of contacting the light irradiation surface of the optical means; and a second cleaning member having a flat surface capable of contacting the light irradiation surface, and the light of the optical means. A cleaning means capable of reciprocating to clean the irradiation surface,
When the cleaning means moves in one direction along the light irradiation surface, the edge of the first cleaning member comes into contact with the light irradiation surface and the plane of the second cleaning member is irradiated with the light. The image formation is characterized in that the plane of the second cleaning member abuts on the light irradiation surface when moving away from the surface and in a direction opposite to the one direction along the light irradiation surface. apparatus. The cleaning means moves the edge of the first cleaning member to a position abutting on the light irradiation surface and a position separated from the light irradiation surface in correspondence with a moving direction along the light irradiation surface. The image forming apparatus according to claim 1, wherein the plane is moved between a position in contact with the light irradiation surface and a position separated from the position. The cleaning means, the image forming apparatus according to claim 1, wherein when moving to the one direction, wherein said first cleaning member is counter abuts on the light irradiation surface.   The image forming apparatus according to claim 1, wherein the cleaning unit is movable to the outside in the longitudinal direction of the optical unit. The image forming apparatus according to claim 1, wherein the cleaning unit moves to the outside in the longitudinal direction of the optical unit and sweeps dust adhering to the light irradiation surface to a collection box.   The image forming apparatus according to claim 1, wherein the first cleaning member and the second cleaning member perform contact and separation operations outside an image area of the optical unit. A light emitting diode array for exposing the photoreceptor;
A lens member that images light emitted from the light emitting diode array on the surface of the photoreceptor;
A housing that supports the light emitting diode array and the lens member;
A sweeping member whose edge can abut against the light irradiation surface of the lens member;
A wiping member capable of contacting a flat surface with the light irradiation surface of the lens member;
A moving mechanism that moves the sweeping member and the wiping member along the light irradiation surface of the lens member ;
When the movement mechanism unit moves the sweeping member and the wiping member in one direction along the light irradiation surface, the moving mechanism abuts the sweeping member on the light irradiation surface and moves the wiping member to the light irradiation surface. A print head , wherein the wiping member is brought into contact with the light irradiation surface when being moved away from the irradiation surface and moving in a direction opposite to the one direction along the light irradiation surface . The moving mechanism unit alternately moves the sweeping member and the wiping member to a position contacting the light irradiation surface and a position separating from the light irradiation surface in correspondence with a moving direction along the light irradiation surface. The print head according to claim 7. The print head according to claim 7 , wherein the moving mechanism is disposed inside the housing.

Images