JP2009014984A - Image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an image forming apparatus suppressing banding in an output image. <P>SOLUTION: A viscoelastic member 62 is energized by energizing force of a coil spring 72 on a side surface part 38B in a supporting member 38 for an LPH 20 installed in an attaching position. Thus, by having the coil spring 72 energized to the side surface part 38B, amplitude of oscillation in the LPH 20 to a side direction is reduced and therefore, the oscillation in the LPH 20 can be attenuated. Furthermore, when detaching the LPH 20, since the viscoelastic member 62 is rotated, the viscoelastic member 62 is not deformed or deteriorated by sliding with the LPH 20. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an image forming apparatus including a light emitter in which a plurality of light emitting elements for exposing the surface of a photosensitive drum are arranged.

In the image forming apparatus described in Patent Document 1, a light emitter that extends in the axial direction of the photosensitive drum is disposed along the surface of the photosensitive drum. At both ends of the light emitter, contact bars extending toward the photosensitive drum are provided. Then, by bringing the tip of the contact rod into contact with the bearing member of the photosensitive drum, the focal length of the light emitter can be maintained at a predetermined distance, and a high-quality output image can be obtained. ing.
JP 2001-130047 JP

  However, since the abutment pin is not provided at the center of the light emitter, when an external force is applied to the light emitter, the light emitter is deformed at the center of the light emitter and the focal length of the light emitter is set to a predetermined distance. I can't keep it. If a contact pin is provided in the central portion of the light emitter, it must be brought into contact with the exposure area of the photosensitive drum, so that the contact pin cannot be provided in the central portion of the light emitter.

  Therefore, in the light emitter of this image forming apparatus, the central portion of the light emitter is deformed by disturbance due to vibration of a motor or the like that drives each portion, and the light emitter vibrates. It is conceivable that the focal length of the light emitter changes due to the vibration of the light emitter, and streaks (so-called banding) occur in the output image.

  An object of the present invention is to suppress banding of an output image in consideration of the above fact.

  An image forming apparatus according to a first aspect of the present invention includes a photosensitive drum on which a latent image is formed by light irradiation, and extends along the axial direction of the photosensitive drum, and emits light to the surface of the photosensitive drum. A plurality of light emitting elements to be irradiated are arranged, have a light emitter that is movable in and removed from the frame member in the attachment / detachment direction, and an attenuation member that contacts the light emitter and is rotatable in the attachment / detachment direction. It is characterized by.

  According to the above configuration, the image forming apparatus is provided with the photoconductor. Further, the light emitter that is movable in and removed from the frame member in the attaching / detaching direction is provided to extend along the axial direction of the photosensitive drum. Further, the light emitter is provided with a plurality of light emitting elements that irradiate light to the outer surface of the photosensitive drum.

  In addition, an attenuation member that can be rotated in the attaching / detaching direction of the light emitter is in contact with the light emitter.

  Here, when the frame member vibrates due to the vibration of a drive source such as a motor, the light emitter tends to vibrate.

  However, since the attenuation member is in contact with the light emitter, the vibration energy of the light emitter is absorbed and the amplitude is reduced, so that the vibration of the light emitter can be attenuated.

  In addition, since the attenuation member rotates when the light emitter is detached, the attenuation member does not slide and deform or deteriorate with the light emitter. And since the contact state of a light-emitting device and an attenuation member is stabilized, a predetermined attenuation effect can be obtained.

  Thus, since the vibration of the light emitter is reduced, banding of the output image can be suppressed.

  An image forming apparatus according to a second aspect of the present invention is the image forming apparatus according to the first aspect, wherein the swinging member supports the damping member so as to be swingable, and the biasing member biases the swinging member toward the light emitter. And a biasing member.

  According to the above configuration, the swing member supports the damping member so as to be swingable, and the biasing member biases the swing member toward the light emitter.

  In this way, the urging member urges the swinging member toward the light emitter, whereby the attenuation member is pressed against the light emitter. Thereby, the contact force between the light emitter and the attenuation member can be maintained at a predetermined value, and the vibration of the light emitter can be attenuated in a stable state.

  An image forming apparatus according to a third aspect of the present invention is the image forming apparatus according to the first or second aspect, wherein the light emitter has an optical member that transmits light emitted from the light emitting element, and a rectangular parallelepiped shape that supports the optical member. A support member, and the support member includes an orthogonal surface portion orthogonal to the focal direction of the light emitter, and a side surface portion orthogonal to the orthogonal surface portion, and the attenuation member is a roller, It abuts on the part.

  According to the above configuration, the light emitter provided extending along the axial direction of the photosensitive drum includes the optical member that transmits the light emitted from the light emitting element and the rectangular parallelepiped support member that supports the optical member. .

  The support member includes an orthogonal surface portion orthogonal to the focal direction of the light emitter and a side surface portion orthogonal to the orthogonal surface portion.

  The damping member, which is a roller, is in contact with the side surface of the support member. When the light emitter is detached, the roller rotates, so that the light emitter can be removed without difficulty.

  Moreover, since the attenuation member is in contact with the side surface portion, it is possible to attenuate the vibration to the side of the light emitter.

  An image forming apparatus according to a fourth aspect of the present invention is the image forming apparatus according to the first or second aspect, wherein the light emitter has an optical member that transmits light emitted from the light emitting element, and a rectangular parallelepiped shape that supports the optical member. A support member, and the support member includes an orthogonal surface portion orthogonal to the focal direction of the light emitter, and a side surface portion orthogonal to the orthogonal surface portion, and the attenuation member is a roller, the orthogonal member It abuts on the surface portion.

  According to the above configuration, the light emitter provided extending along the axial direction of the photosensitive drum includes the optical member that transmits the light emitted from the light emitting element and the rectangular parallelepiped support member that supports the optical member. .

  The support member includes an orthogonal surface portion orthogonal to the focal direction of the light emitter and a side surface portion orthogonal to the orthogonal surface portion.

  The damping member, which is a roller, is in contact with the orthogonal surface portion of the support member. When the light emitter is detached, the roller rotates, so that the light emitter can be removed without difficulty.

  In addition, since the attenuation member is in contact with the orthogonal surface portion, the vibration in the focal direction of the light emitter can be attenuated.

  An image forming apparatus according to a fifth aspect of the present invention is the image forming apparatus according to the first or second aspect, wherein the light emitter has an optical member that transmits light emitted from the light emitting element, and a rectangular parallelepiped shape that supports the optical member. A support member, and the support member includes an orthogonal surface portion orthogonal to the focal direction of the light emitter, and a side surface portion orthogonal to the orthogonal surface portion, and each of the side surfaces includes the focal direction and Protruding members having orthogonal contact surface portions are disposed, and the attenuation member contacts the side surface portions and the contact surface portions.

  According to the above configuration, the light emitter provided extending along the axial direction of the photosensitive drum includes the optical member that transmits the light emitted from the light emitting element and the rectangular parallelepiped support member that supports the optical member. .

  The support member includes an orthogonal surface portion orthogonal to the focal direction of the light emitter and a side surface portion orthogonal to the orthogonal surface portion. Further, a protruding member having a contact surface portion orthogonal to the focal direction is disposed on each side surface portion.

  The attenuation member is in contact with the side surface portion of the support member and the contact surface portion of the protruding member. For this reason, the vibration to the side of the light emitter and the vibration in the focal direction can be attenuated.

  An image forming apparatus according to a sixth aspect of the present invention is the image forming apparatus according to any one of the first to fifth aspects, wherein the light emitting device is attached and detached in a focal direction of the light emitting device.

  According to the above configuration, the direction in which the light emitter is detached is the focal direction of the light emitter. When the light emitter is detached, the attenuation member rotates in the focal direction, so that the attenuation member does not slide and deform or deteriorate with the light emitter.

  An image forming apparatus according to a seventh aspect of the present invention is the image forming apparatus according to any one of the first to fifth aspects, wherein the light emitting device is attached and detached in an axial direction of the photosensitive drum.

  According to the above configuration, the attaching / detaching direction of the light emitter is the axial direction of the photosensitive drum. When the light emitter is detached, the attenuation member rotates in the axial direction, so that the attenuation member does not slide and deform or deteriorate with the light emitter.

  An image forming apparatus according to an eighth aspect of the present invention is the image forming apparatus according to any one of the first to seventh aspects, wherein the damping member is formed of a viscoelastic member.

  According to the said structure, a damping member is comprised with a viscoelastic member. For this reason, a viscoelastic member deform | transforms with the vibration of a light-emitting device, and the vibration of a light-emitting device can be attenuated by absorbing the vibration energy of a light-emitting device.

  According to the image forming apparatus of the present invention, banding of the output image can be suppressed.

  An image forming apparatus according to a first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 6, the image forming apparatus 10 is stretched around a plurality of rollers 12 inside a casing 11 constituting the main body, and is conveyed in the direction of arrow A by driving a motor (not shown). An endless belt-like intermediate transfer belt 14 is provided.

  The image forming apparatus 10 corresponds to the formation of a color image, and forms an image forming unit that forms toner images corresponding to four colors of yellow (Y), magenta (M), cyan (C), and black (K). 15Y, 15M, 15C, and 15K are arranged along the longitudinal direction of the intermediate transfer belt 14.

  In addition, about the member provided for each color, it adds and shows the alphabet (Y / M / C / K) which shows each color at the end of a code | symbol, but when it demonstrates without distinguishing especially a color, The description will be made by omitting the alphabet at the end of the code.

  The image forming unit 15 includes a photosensitive drum 16 that is rotated counterclockwise by a driving unit including a motor and a gear (not shown).

  Further, a charging roller 18 for uniformly charging the surface of the photosensitive drum 16 to a predetermined potential is disposed on the peripheral surface of the photosensitive drum 16. The charging roller 18 is a conductive roller, and its peripheral surface is in contact with the peripheral surface of the photosensitive drum 16, and is arranged so that the axial direction of the charging roller 18 coincides with the axial direction of the photosensitive drum 16. Has been.

  Further, an LED (light emitting diode) as a light emitting element for forming an electrostatic latent image on the photosensitive drum 16 is used as a light source on the peripheral surface downstream of the charging roller 18 in the rotation direction of the photosensitive drum 16. An LED print head (LPH) 20 as a light emitter is provided extending in the axial direction of the photosensitive drum 16. Hereinafter, the LED print head 20 is referred to as LPH 20.

  As shown in FIG. 5, the LPH 20 includes a plurality of LEDs arranged in a line shape, an LED array 28 in which LED chips 30 are arranged, and a plurality of LEDs in order to image light output from the LEDs on the surface of the photoreceptor. A selfoc lens array 32 in which rod lenses are arranged and a rectangular parallelepiped support member 38 that supports the selfoc lens array 32 are configured.

  Specifically, the LED array 28 is configured by arranging a plurality of LED chips 30 on a printed board 28A on which a circuit for supplying various signals for controlling the driving of the LED array 28 is formed. The number of LEDs in the entire LED array 28 corresponds to the number of pixels (dots) corresponding to the resolution, for example, paper of A3 size (420 mm × 297 mm), and printing is performed at 600 dpi in the LED arrangement direction (LPH longitudinal direction). In this case, about 7020 are provided.

  Further, the LED chips 30 are arranged in the longitudinal direction of the LPH 20 (staggered arrangement) with the arrangement direction of each LED aligned with the longitudinal direction of the LPH 20, and the mounting positions are alternately shifted by a predetermined pitch (staggered arrangement). It is attached.

  Since the LED chips 30 are arranged in a staggered manner in this way, the LPH longitudinal direction positions of the LED chips 30 adjacent to each other in the longitudinal direction of the LPH 20 can be arranged in an overlapping manner, and the intervals between the LEDs may vary. There is no such thing.

  The LED chips 30 may be arranged in a line regardless of the staggered arrangement as long as the LEDs are arranged at equal intervals in the LPH longitudinal direction. May be arranged only.

  The SELFOC lens array 32 is provided between the LED array 28 and the photosensitive drum 16 as an imaging lens. The SELFOC lens array 32 is composed of, for example, refractive index distribution type rod lenses arranged at a pitch corresponding to each pixel (dot) corresponding to the resolution, and sensitizes the light beam emitted from each LED. An image is formed on the body drum 16. Details of the LPH 20 will be described later.

  The LPH 20 having the above structure forms an electrostatic latent image on the photosensitive drum 16 by irradiating the photosensitive drum 16 with a light beam according to image data.

  Further, as shown in FIG. 6, an electrostatic latent image formed on the photosensitive drum 16 is placed on a peripheral surface downstream of the LPH 20 in the rotation direction of each photosensitive drum 16 with a predetermined color (yellow / magenta). / Cyan / Black) is provided with a developing device 22 for developing the toner image to form a toner image.

  The developing device 22 has a cylindrical developing roller 24 that is disposed in proximity to the photosensitive drum 16 and is rotatably provided. A developing bias is applied to the developing roller 24, and the toner loaded in the developing device 22 is attached to the peripheral surface. As the developing roller 24 rotates, the toner attached to the developing roller 24 is conveyed to the surface of the photosensitive drum 16, and the toner is rubbed against the photosensitive drum 16 to form an electrostatic latent image formed on the photosensitive drum 16. The image is developed.

  Further, a transfer roller 25 for transferring the toner image on each photosensitive drum 16 to the intermediate transfer belt 14 is provided on the peripheral surface downstream of the developing device 22 in the rotation direction of each photosensitive drum 16. . The transfer roller 25 is charged to a predetermined potential and rotates clockwise to convey the intermediate transfer belt 14 at a predetermined speed and sequentially face the photosensitive drum 16. As a result, the transfer roller 25 transfers the toner on the photosensitive drum 16 onto the intermediate transfer belt 14.

  Further, a cleaning blade 26 that collects residual toner such as transfer residual toner and retransfer toner on the photosensitive drum 16 is disposed downstream of the transfer roller 25 on the peripheral surface of the photosensitive drum 16. The cleaning blade 26 is arranged so that one side is in contact with the photosensitive drum 16, and toner remaining on the photosensitive drum 16 without being transferred to the intermediate transfer belt 14, or on the photosensitive drum 16 at the time of transfer. The toner of other colors that have adhered to the toner is scraped off and collected.

  Here, the toner images of different colors formed by the image forming units 15 are transferred on the belt surface of the intermediate transfer belt 14 so as to overlap each other. As a result, a color toner image is formed on the intermediate transfer belt 14. In this embodiment, the toner image in which the four color toner images are transferred in a superimposed manner is referred to as a final toner image.

  On the downstream side of the four image forming units 15 in the transport direction of the intermediate transfer belt 14, a transfer device 34 including two rollers 34A and 34B facing each other is disposed. The final toner image formed on the intermediate transfer body belt 14 is sent between the rollers 34A and 34B, taken out from the paper tray 36 provided at the bottom of the image forming apparatus 10, and is similarly supplied to the rollers 34A and 34B. It is transferred to the sheet material P that has been conveyed in between.

  In addition, a fixing device 40 including a heating roller 40A and a pressure roller 40B is disposed in the conveyance path of the sheet material P to which the final toner image has been transferred. The sheet material P conveyed to the fixing device 40 is nipped and conveyed by the heating roller 40A and the pressure roller 40B, whereby the toner on the sheet material P melts and is pressed against the sheet material P to be fixed. .

  On the other hand, a cleaner 42 that collects toner remaining on the intermediate transfer belt 14 without being transferred to the sheet material P by the transfer device 34 is disposed downstream of the transfer device 34 in the conveyance direction of the intermediate transfer belt 14. Has been. The cleaner 42 is provided with a blade 44 so as to be in contact with the intermediate transfer body belt 14, and collects residual toner by rubbing it.

  In the image forming apparatus 10 configured as described above, an image is formed as follows.

  First, the charging roller 18 uniformly negatively charges the surface of the photosensitive drum 16 with a predetermined charging portion potential. Further, exposure is performed by the LHP 20 so that the charged image portion on the photosensitive drum 16 has a predetermined exposure portion potential, and an electrostatic latent image is formed on the photosensitive drum 16.

  That is, an electrostatic latent image corresponding to an image is formed on each photosensitive drum 16 by turning on and off the laser beam of the LHP 20 based on image data supplied from a control unit (not shown).

  Further, when the electrostatic latent image on the rotating photosensitive drum 16 passes through the developing roller 24 provided in the developing device 22, the toner of the developer G adheres to the electrostatic latent image by electric force, and the electrostatic latent image Is visualized as a toner image.

  The visualized toner images of the respective colors are sequentially transferred to the intermediate transfer body belt 14 by the electric force of the transfer roller 25, and a color final toner image is formed on the intermediate transfer body belt 14.

  This final toner image is fed between rollers 34A and 34B provided in the transfer device 34, taken out from the paper tray 36, and transferred to the sheet material P that is also conveyed between the rollers 34A and 34B. .

  Further, the toner image transferred to the sheet material P is fixed by the fixing device 40, and the sheet material P is discharged outside the device.

  Next, the LPH 20 and the photosensitive drum 16 will be described in detail.

  As shown in FIG. 1, the photosensitive drum 16 has a cylindrical shaft portion 50 that protrudes outward from both end faces. Further, cylindrical bearings 52 are respectively provided at both ends of the photosensitive drum 16, and the bearings 52 rotatably support the photosensitive drum 16.

  Further, the LPH 20 is disposed below the photoconductive drum 16 so as to face the photoconductive drum 16, and contact pins 46 extending toward the bearing 52 are provided at both ends of the LPH 20. Yes.

  As shown in FIG. 3A, the tip of the contact pin 46 is in contact with the surface of the bearing 52, and the focal direction of the LPH 20 with respect to the photosensitive drum 16 is maintained at a predetermined distance. In addition, the support member 38 of the LPH 20 to which the contact pin 46 is fixed includes a side surface portion 38B orthogonal to the orthogonal surface portion 38A and the orthogonal surface portion 38A.

  On the other hand, both ends of the LPH 20 are provided with brackets 54 (see FIG. 1) which are fixed to a frame member (not shown) and have a U-shaped cross section with the upper part opened.

  A hemispherical projection 56 is provided inside the standing plate 54A of the bracket 54, and a plate spring 58 having a square cross section is provided on the standing plate 54A facing the projection 56. Yes. The end of the leaf spring 58 is fixed to the standing plate 54A, and the leaf spring 58 urges the side surface portion 38B of the support member 38 and presses the support member 38 against the protrusion 56.

  Further, a pair of leaf springs 60 having a square cross-sectional shape for biasing the orthogonal surface portion 38A of the support member 38 from below are attached to the standing plate 54A so as to face each other. More specifically, the inclined surface 60 </ b> A of the leaf spring 60 biases the orthogonal surface portion 38 </ b> A in the focal direction, and the contact pin 46 is brought into contact with the bearing 52.

  With this configuration, both end portions of the LPH 20 are supported by the bracket 54.

  The LPH 20 is detachable in the focal direction, and the LPH 20 is moved downward from the mounting position of the LPH 20 shown in FIG. It moves to the position.

  When the LPH 20 is moved from the attachment position to the separation position, the plate spring 60 is bent so that the LPH 20 can be moved downward. When the LPH 20 is moved to the separation position, the plate spring 60 is restored and the plate spring 60 is inclined. The portion 60B contacts the orthogonal surface portion 38A located above the support member 38. As a result, the LPH 20 is supported at the detached position.

  On the other hand, as shown in FIG. 1, a roller-like viscoelastic member 62 that is a damping member is in contact with the longitudinal center of the side surface portion 38 </ b> B of the LPH 20.

  Specifically, as shown in FIG. 2A, a shaft member 64 that rotatably supports the viscoelastic member 62 is provided at the center of the roller-like viscoelastic member 62 in the axial direction of the photosensitive drum 16. It extends to. The shaft member 64 exposed from both ends of the viscoelastic member 62 is fixed to one end of a long plate-like swinging member 66, and the other end of the swinging member 66 is fixed to a rectangular parallelepiped holding member 68. It is supported by.

  Further, one end of a tension coil spring 72 is fixed to the central portion in the longitudinal direction of the swing member 66, and the other end of the coil spring 72 is fixed to a holding member 68. With this configuration, the viscoelastic member 62 tries to rotate counterclockwise (arrow B direction) about the shaft portion 70 by the biasing force of the coil spring 72 and is biased toward the side surface portion 38B of the support member 38.

  In addition, when the LPH 20 moves to the separation position shown in FIG. 2B, the viscoelastic member 62 rotates counterclockwise by the frictional force with the side surface portion 38B and is separated from the side surface portion 38B. Yes. Further, when the LPH 20 moves to the disengagement position, the swinging member 66 that supports the viscoelastic member 62 swings counterclockwise about the shaft portion 70 and swings by a stopper (not shown) provided on the shaft portion 70. The member 66 is held in the horizontal direction.

  When the LPH 20 is moved from the separation position shown in FIG. 2 (B) to the mounting position shown in FIG. 2 (A), the operation is the reverse of the above-described operation. That is, the viscoelastic member 62 hits the side surface 38B of the LPH 20 that moves to the mounting position, the viscoelastic member 62 rotates clockwise, and the swing member 66 swings clockwise. As a result, the viscoelastic member 62 returns to the initial position where the coil spring 72 biases the side portion 38B.

  Here, the inventor of the present application, in the experiment, when the central portion of the LPH 20 supported at both ends is biased via the viscoelastic member 62 and when biased without the viscoelastic member 62 Then, the amplitude of LPH20 was investigated.

  As shown in FIG. 4, it can be seen that when the viscoelastic member 62 is used, the amplitude is remarkably reduced in the vicinity of the natural frequency.

  Here, when the LPH 20 is vibrated by the vibration of a motor or the like that drives each part, the LPH 20 vibrates, the focal length of the LPH 20 with respect to the photosensitive drum 16 changes, and streaks (so-called banding) occur in the output image There is.

  However, in this embodiment, the viscoelastic member 62 is urged by the urging force of the coil spring 72 on the side surface portion 38B of the support member 38 of the LPH 20 disposed at the mounting position.

  In this way, the coil spring 72 biases the viscoelastic member 62 toward the side surface portion 38B, thereby reducing the amplitude of the vibration of the LPH 20 to the side, thereby attenuating the vibration of the LPH 20.

  Further, since the viscoelastic member 62 rotates when the LPH 20 is detached, the viscoelastic member 62 does not slide and deform or deteriorate with the LPH 20.

  Further, since the coil spring 72 presses the viscoelastic member 62 against the LPH 20, the contact force between the LPH 20 and the viscoelastic member 62 can be maintained at a predetermined value, and the vibration of the LPH 20 can be attenuated in a stable state.

  Thus, since the vibration of the LPH 20 is reduced, banding of the output image can be suppressed.

  The material of the viscoelastic member 76 can be selected from styrene butadiene rubber, butyl rubber, silicone rubber, polynorbornene rubber, soft polyurethane, silicone gel, urethane gel, etc., but in this embodiment, silicone rubber is used. ing.

  Next, the image forming apparatus 10 of the second embodiment will be described with reference to FIGS.

  In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In this embodiment, as shown in FIGS. 7 and 8, as in the first embodiment, the viscoelastic member 80 is not biased by the coil spring 72 to the side surface portion 38 </ b> B of the support member 38, and is orthogonal. It is biased by the surface portion 38A. Further, the outer shape of the viscoelastic member 80 is made slightly smaller.

  In this manner, the coil spring 72 biases the viscoelastic member 80 toward the orthogonal surface portion 38A of the support member 38, whereby the amplitude of vibration in the focal direction of the LPH 20 can be reduced and the vibration of the LPH 20 can be attenuated.

  Next, the image forming apparatus 10 according to the third embodiment will be described with reference to FIGS.

  In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In this embodiment, as shown in FIGS. 9 and 10, as in the first embodiment, the viscoelastic member 88 is not pivotally supported so as to be rotatable in the focal direction of the LPH 20. The shaft is rotatably supported in the axial direction.

  As shown in FIGS. 9 and 11, brackets 82 are provided at both ends of the LPH 20 so as to be fixed to a frame member (not shown) and have a U-shaped cross section with the upper part opened.

  A hemispherical projection 84 is provided on the inner side of the standing plate 82A of the bracket 82, and a plate spring 86 having a square cross section as viewed from above is provided on the standing plate 54A facing the projection 84. Is provided. The end portion of the leaf spring 86 is fixed to the standing plate 82A, and the leaf spring 86 biases the side surface portion 38B of the support member 38 and presses the support member 38 against the protruding portion 84.

  With this configuration, both end portions of the LPH 20 are supported by the bracket 54, and the LPH 20 is further moved from the mounting position shown in FIG. By doing so, the LPH 20 can be moved to the separation position shown in FIG.

  Further, as shown in FIG. 10A, the coil spring 72 biases the viscoelastic member 88 toward the side surface portion 38B of the support member 38, thereby reducing the amplitude of the lateral vibration of the LPH 20, and the LPH 20 Can be damped.

  Further, as shown in FIG. 10B, when the LPH 20 is moved in the axial direction (arrow C direction) of the photosensitive drum 16 to be detached, the viscoelastic member 80 rotates. Does not slide or deform with the LPH 20 or deteriorate.

  Next, an image forming apparatus 10 according to a fourth embodiment will be described with reference to FIGS.

  In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In this embodiment, as shown in FIGS. 12 and 13, unlike the first embodiment, the viscoelastic member 62 is arranged on the opposite side with the LPH 20 interposed therebetween.

  Further, each side surface portion 38B of the support member 38 is provided with a projecting member 90 having a triangular cross section having a contact surface portion 90A orthogonal to the focal direction of the LPH 20.

  With this configuration, the coil spring 72 biases the viscoelastic member 62 toward the side surface portion 38B and the contact surface portion 90A.

  In this way, by urging the viscoelastic member 62 toward the side surface portion 38B and the contact surface portion 90A, the vibration to the side of the LPH 20 and the vibration in the focal direction can be attenuated.

FIG. 2 is a perspective view showing a photosensitive drum, LPH, and the like employed in the image forming apparatus according to the first embodiment of the present invention. 2A and 2B are cross-sectional views of a central portion in the longitudinal direction of a photosensitive drum, LPH, and the like employed in the image forming apparatus according to the first embodiment of the present invention. 2A and 2B are cross-sectional views of end portions in the longitudinal direction of a photosensitive drum, LPH, and the like employed in the image forming apparatus according to the first embodiment of the present invention. 6 is a diagram illustrating a result of an experiment of vibration in LPH employed in the image forming apparatus according to the first embodiment of the present invention. 1 is a perspective view showing an LPH employed in an image forming apparatus according to a first embodiment of the present invention. 1 is a schematic configuration diagram illustrating an image forming apparatus according to a first embodiment of the present invention. FIG. 5 is a perspective view showing a photosensitive drum, LPH, and the like employed in an image forming apparatus according to a second embodiment of the present invention. (A) (B) It is sectional drawing of the longitudinal direction center parts, such as a photosensitive drum and LPH, which were employ | adopted for the image forming apparatus which concerns on 2nd Embodiment of this invention. FIG. 6 is a perspective view showing a photosensitive drum, LPH, and the like employed in an image forming apparatus according to a third embodiment of the present invention. (A) (B) It is sectional drawing of the longitudinal direction center parts, such as a photoconductive drum and LPH, which were employ | adopted for the image forming apparatus which concerns on 3rd Embodiment of this invention. 2A and 2B are cross-sectional views of end portions in the longitudinal direction of a photosensitive drum, LPH, and the like employed in the image forming apparatus according to the first embodiment of the present invention. FIG. 10 is a perspective view showing a photosensitive drum, LPH, and the like employed in an image forming apparatus according to a fourth embodiment of the present invention. (A) (B) It is sectional drawing of longitudinal direction center parts, such as a photoconductive drum and LPH, which were employ | adopted for the image forming apparatus which concerns on 4th Embodiment of this invention.

Explanation of symbols

10 Image forming apparatus 16 Photosensitive drum 20 LPH (light emitting device)
32 Selfoc lens array (optical member)
38 Support member 38B Side surface portion 38A Orthogonal surface portion 54 Bracket (frame member)
62 Viscoelastic member (damping member)
66 Swing member 72 Coil spring (biasing member)
76 Viscoelastic member (damping member)
80 Viscoelastic member (damping member)
82 Bracket (Frame member)
90A Abutting surface 90 Projecting member

Claims (8)

A photosensitive drum on which a latent image is formed by light irradiation;
A plurality of light emitting elements that extend along the axial direction of the photosensitive drum and that irradiates light on the surface of the photosensitive drum, are arranged in a detachable direction with respect to a frame member;
An attenuating member that contacts the light emitter and is rotatable in the detaching direction;
An image forming apparatus comprising: A swinging member for swingably supporting the damping member;
A biasing member that biases the swing member toward the light emitter;
The image forming apparatus according to claim 1, further comprising: The light emitter includes an optical member that transmits light emitted from the light emitting element, and a rectangular parallelepiped support member that supports the optical member,
The support member includes an orthogonal surface portion orthogonal to the focal direction of the light emitter, and a side surface portion orthogonal to the orthogonal surface portion,
The image forming apparatus according to claim 1, wherein the damping member is a roller and abuts on the side surface portion. The light emitter includes an optical member that transmits light emitted from the light emitting element, and a rectangular parallelepiped support member that supports the optical member,
The support member includes an orthogonal surface portion orthogonal to the focal direction of the light emitter, and a side surface portion orthogonal to the orthogonal surface portion,
The image forming apparatus according to claim 1, wherein the attenuation member is a roller and abuts on the orthogonal surface portion. The light emitter includes an optical member that transmits light emitted from the light emitting element, and a rectangular parallelepiped support member that supports the optical member,
The support member includes an orthogonal surface portion orthogonal to the focal direction of the light emitter, and a side surface portion orthogonal to the orthogonal surface portion,
Each of the side portions is provided with a projecting member having a contact surface portion orthogonal to the focal direction,
The image forming apparatus according to claim 1, wherein the attenuation member is in contact with the side surface portion and the contact surface portion.   The image forming apparatus according to claim 1, wherein a direction in which the light emitter is attached / detached is a focal direction of the light emitter.   The image forming apparatus according to claim 1, wherein a direction in which the light emitter is attached and detached is an axial direction of the photosensitive drum.   The image forming apparatus according to claim 1, wherein the damping member is formed of a viscoelastic member.

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