WO2014102958A9 - 画像形成装置 - Google Patents
画像形成装置 Download PDFInfo
- Publication number
- WO2014102958A9 WO2014102958A9 PCT/JP2012/083847 JP2012083847W WO2014102958A9 WO 2014102958 A9 WO2014102958 A9 WO 2014102958A9 JP 2012083847 W JP2012083847 W JP 2012083847W WO 2014102958 A9 WO2014102958 A9 WO 2014102958A9
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- shutter
- light beam
- cover
- transparent window
- polygon mirror
- Prior art date
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Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
- G03G15/043—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material with means for controlling illumination or exposure
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/105—Scanning systems with one or more pivoting mirrors or galvano-mirrors
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/12—Scanning systems using multifaceted mirrors
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
- G03G15/0105—Details of unit
- G03G15/011—Details of unit for exposing
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
- G03G15/0142—Structure of complete machines
- G03G15/0178—Structure of complete machines using more than one reusable electrographic recording member, e.g. one for every monocolour image
- G03G15/0189—Structure of complete machines using more than one reusable electrographic recording member, e.g. one for every monocolour image primary transfer to an intermediate transfer belt
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
- G03G15/0409—Details of projection optics
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
- G03G15/043—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material with means for controlling illumination or exposure
- G03G15/0435—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material with means for controlling illumination or exposure by introducing an optical element in the optical path, e.g. a filter
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
- G03G21/1604—Arrangement or disposition of the entire apparatus
- G03G21/1623—Means to access the interior of the apparatus
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
- G03G21/1661—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements means for handling parts of the apparatus in the apparatus
- G03G21/1666—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements means for handling parts of the apparatus in the apparatus for the exposure unit
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2221/00—Processes not provided for by group G03G2215/00, e.g. cleaning or residual charge elimination
- G03G2221/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements and complete machine concepts
- G03G2221/1636—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements and complete machine concepts for the exposure unit
Definitions
- the present invention relates to an image forming apparatus including an optical scanning device having a transparent window for passing laser light and a mechanism for moving a shutter covering the transparent window for passing laser light.
- An optical scanning device provided in an electrophotographic image forming apparatus includes a transparent window that allows laser light deflected by a polygon mirror to pass outside the optical scanning device. Dust adhering to the transparent window blocks the laser beam, leading to a reduction in the quality of the output image.
- toner dropped from the developing device adheres to the transparent window due to vibration when removing a cartridge in which the developing device and the photosensitive member are integrated.
- Patent Document 1 describes an image forming apparatus in which a slit for passing a laser beam provided in an optical scanning device is moved by a shutter moving mechanism so as to prevent dust from being formed in the slit. .
- a shutter is moved in a first direction by a motor, an opening is provided in the shutter, and an elastic force of a spring connected to the inner wall of the shutter opening and the upper cover of the optical scanning device is used.
- a configuration in which the shutter is moved in the second direction is described.
- Patent Document 1 is configured to attach a spring to the upper cover of the optical scanning device.
- it is necessary to provide a gap for providing a spring between the shutter and the upper cover, or it is necessary to design the spring so that the spring fits inside the opening by increasing the thickness of the shutter. There arises a problem that the configuration of the shutter and the optical scanning device is increased.
- the image forming apparatus of the present invention has a first light source that emits a first light beam for exposing the first photoconductor, and a second light source for exposing the second photoconductor.
- a second light source that emits the light beam, and the first light beam scans the first photoconductor, and the second light beam scans the second photoconductor.
- a rotating polygon mirror that deflects the first light beam and the second light beam on opposite sides of the rotating polygon mirror.
- a mirror an optical box in which the first light source, the second light source, and the rotating polygon mirror are disposed; and a cover for closing the optical box, the first deflected by the rotating polygon mirror
- the first transparent window through which the light beam passes is deflected by the rotating polygonal mirror.
- a second transparent window that allows the light beam to pass therethrough, a cover that is disposed on the opposite side of the rotary polygon mirror, and a cover that faces the cover, the first transparent window and the second transparent window And a position retracted from the optical path of the first light beam that has passed through the first transparent window and the optical path of the second light beam that has passed through the second transparent window.
- the elastic force that urges the shutter in a direction opposite to the direction in which the pressing means presses is increased, and the elastic force causes the shutter to move in the opposite direction.
- a shutter moving mechanism having a spring for riding, and on the opposite surface of the cover facing the shutter, on the opposite side of the first light source and the second light source with the rotary polygon mirror interposed therebetween And a recess is provided between the first transparent window and the second transparent window, the recess falling into the inner side of the optical box closed by the cover, and the spring coupled to the shutter is provided in the recess. Is provided with a connecting portion to which the two are connected.
- the concave portion is provided on the facing surface of the cover that faces the shutter, and the spring for sliding the shutter is connected to the connecting portion provided in the concave portion, thereby configuring the shutter and the optical scanning device. Increase in size can be suppressed.
- FIG. 1 Schematic sectional view of the image forming apparatus Perspective view of appearance of image forming apparatus
- recovery toner container 114 The figure which shows the state in which the collection
- FIG. 1 is a schematic cross-sectional view of an electrophotographic image forming apparatus 100.
- An image forming apparatus 100 illustrated in FIG. 1 includes four image forming units 101Y, 101M, 101C, and 101BK that form toner images of yellow, magenta, cyan, and black.
- Each of the image forming units 101Y, 101M, 101C, and 101BK includes photosensitive drums 102Y, 102M, 102C, and 102BK that are photosensitive members.
- Each image forming unit includes charging devices 103Y, 103M, 103C, and 103BK that charge the photosensitive drums 102Y, 102M, 102C, and 102BK, and developing devices 104Y and 104M that develop the electrostatic latent image on the photosensitive drum using toner. , 104C, 104BK. Further, each image forming unit includes cleaning devices 111Y, 111M, 111C, and 111BK that remove residual toner on the photosensitive drum from the photosensitive drum.
- Each image forming unit constitutes a process cartridge in which the above-described photosensitive drum, charging device, developing device, and cleaning device are integrated.
- the process cartridge is an exchange unit that can be attached to and detached from the image forming apparatus.
- the image forming units 101Y, 101M, 101C, and 101BK are referred to as process cartridges 101Y, 101M, 101C, and 101BK.
- the main body of the image forming apparatus 100 includes an optical scanning device 200, transfer rollers 105Y, 105M, 105C, and 105BK, an intermediate transfer belt 106, a cleaning device 112, a paper feeding unit 109, a paper discharge unit 110, a transfer roller 107, and a fixing device 108.
- the optical scanning device 200 is disposed on the lower side in the gravity direction with respect to each photosensitive drum.
- the optical scanning device may be arranged to expose the photosensitive drum from the upper side in the gravity direction.
- the optical scanning device 200 emits light beams LY, LM, LC, and LBK (laser light) that expose the photosensitive drums 102Y, 102M, 102C, and 102BK charged by the charging devices 103Y, 103M, 103C, and 103BK, respectively.
- An electrostatic latent image is formed on the photosensitive drums 102Y, 102M, 102C, and 102BK by exposure with the light beam.
- the developing device 104Y develops the electrostatic latent image formed on the photosensitive drum 102Y with yellow toner.
- the developing device 104M develops the electrostatic latent image formed on the photosensitive drum 102M with magenta toner.
- the developing device 104C develops the electrostatic latent image formed on the photosensitive drum 102C with cyan toner.
- the developing device 104BK develops the electrostatic latent image formed on the photosensitive drum 102BK with black toner.
- the yellow toner image formed on the photosensitive drum 102Y is transferred to the intermediate transfer belt 106 which is an intermediate transfer member by the transfer roller 105Y in the transfer portion Ty.
- the cleaning device 111Y collects toner remaining on the photosensitive drum 102Y without being transferred to the intermediate transfer belt 106, between the transfer portion Ty in the rotation direction of the photosensitive drum 102Y and the charging portion of the charging device 103Y.
- the magenta toner image formed on the photosensitive drum 102M is transferred to the intermediate transfer belt 106 by the transfer roller 105M at the transfer portion Tm.
- the cleaning device 111M collects the toner remaining on the photosensitive drum 102M without being transferred to the intermediate transfer belt 106 between the transfer portion Tm in the rotation direction of the photosensitive drum 102M and the charging portion of the charging device 103M.
- the cyan toner image formed on the photosensitive drum 102C is transferred to the intermediate transfer belt 106 by the transfer roller 105C at the transfer portion Tc.
- the cleaning device 111C collects the toner remaining on the photosensitive drum 102C without being transferred to the intermediate transfer belt 106 between the transfer portion Tc in the rotation direction of the photosensitive drum 102C and the charging portion of the charging device 103C.
- the black toner image formed on the photosensitive drum 102BK is transferred to the intermediate transfer belt 106 by the transfer roller 105BK in the transfer portion TBk.
- the cleaning device 111BK collects the toner remaining on the photosensitive drum 102BK without being transferred to the intermediate transfer belt 106 between the transfer portion TBk in the rotation direction of the photosensitive drum 102BK and the charging portion of the charging device 103BK.
- the cleaning devices 111Y, 111M, 111C, and 111BK of this embodiment include a blade that contacts the photosensitive drum, and collects the residual toner by scraping off the toner remaining on the photosensitive drum by the blade.
- the toner images of each color transferred onto the intermediate transfer belt 106 are transferred onto the recording paper conveyed from the paper supply unit 109 by the transfer roller 107 in the transfer unit T2.
- the toner image transferred to the recording paper in the transfer unit T2 is fixed by the fixing device 108 and discharged to the paper discharge unit 110 after the fixing process.
- the image forming apparatus 100 includes a cleaning device 112 between the transfer unit T2 and the transfer unit Ty in the rotation direction of the intermediate transfer belt 106.
- the cleaning device 112 includes a blade that comes into contact with the intermediate transfer belt 106, and scrapes residual toner on the intermediate transfer belt 106 with the blade, thereby removing toner remaining on the intermediate transfer belt 106 without being transferred to the recording medium. to clean up.
- FIG. 2 is a perspective view of the appearance of the image forming apparatus 100.
- the image forming apparatus 100 of this embodiment includes a maintenance door 113.
- a collected toner container 114 is attached to the inside of the door 113 of the image forming apparatus 100.
- the collected toner container 114 accumulates the toner collected from the respective photosensitive drums by the cleaning devices 111Y, 111M, 111C, and 111BK, and the toner collected from the intermediate transfer belt 106 by the cleaning device 112.
- the collected toner container 114 is an exchange unit that can be attached to and detached from the main body of the image forming apparatus 100.
- the user performs an operation of replacing the collected toner container 114 by displaying a prompt to replace the collected toner container 114 on a display unit (not shown).
- the user removes the collected toner container 114 from the image forming apparatus 100 by moving the collected toner container 114 attached to the image forming apparatus 100 in the ⁇ X direction (FIG. 2B). c)).
- the collected toner container 114 is attached to the image forming apparatus 100 as shown in FIG.
- the user cannot remove the process cartridge while the collected toner container 114 is attached to the image forming apparatus 100.
- FIG. 3A is a diagram illustrating a connection state between the collected toner container 114 and the cleaning device 112.
- FIG. 3B is a perspective view of the collected toner container 114.
- the collected toner container 114 is integrally formed with a toner transport path 114a connected to the cleaning device 112.
- the toner conveyance path 114a is provided with a toner receiving port 114d through which the toner conveyed from the cleaning device 112 flows.
- the toner receiving port 114d is connected to the toner conveyance path 112a of the cleaning device 112.
- the toner cleaned by the cleaning device 112 during image formation is moved by a transport screw (not shown) and passes through the toner transport path 112a on the cleaning device 112 side and the toner transport path 114a on the recovery toner container 114 side to the recovered toner container 114. Collected.
- the collection toner container 114 is formed with receiving ports 114e, 114f, 114g, and 114h for receiving toner conveyed from the cleaning devices 111Y, 111M, 111C, and 111BK.
- the receiving port 114e is connected to the cleaning device 111Y
- the receiving port 114f is connected to the cleaning device 111M
- the receiving port 114g is connected to the cleaning device 111C
- the receiving port 114h is connected to the cleaning device 111BK.
- the collected toner container 114 includes a toner storage portion 114i that stores toner flowing in from each cleaning device, and a protrusion 114b.
- the protrusion 114b includes a first flat surface 114b1 (first inclined portion) and a second flat surface 114b2 (second inclined portion).
- the first plane 114b1 is a plane inclined with respect to a virtual plane (XZ plane) parallel to the moving direction (X-axis direction) of the collected toner container 114b when the collected toner container 114 is attached and detached.
- the second plane 114b2 is a plane that is continuous with the first plane 114b1 and is inclined with respect to the virtual plane.
- the inclination angle of the second plane 114b2 with respect to the virtual plane is smaller than the inclination angle of the first plane 114b1 with respect to the virtual plane.
- the angle between the virtual plane and the second plane 114b2 is approximately 0 degrees.
- the protrusion 114b will be described later.
- the first plane 114b1 and the second plane 114b2 may have a linear shape such as a V-shaped top.
- FIG. 4A is a diagram illustrating a state where the collected toner container 114 is attached to the image forming apparatus 100.
- the image forming apparatus 100 includes a toner container holding mechanism 115 (toner container holding unit) that holds the collected toner container 114 to such an extent that the user can easily attach and detach it.
- the toner container holding mechanism 115 includes a contact member 401 that contacts a protrusion 114 c (positioning protrusion) provided on the collected toner container 114 and a spring 402 that is attached to the contact member 401.
- FIG. 4B to 4D are enlarged views of the vicinity of the toner container holding mechanism 115, and are diagrams for explaining an operation example of the toner container holding mechanism 115 when the collected toner container 114 is attached to and detached from the image forming apparatus. It is.
- FIG. 4B shows a state before the collected toner container 114 is attached to a position (predetermined position) for receiving toner from each cleaning device.
- FIG. 4D shows a state where the collected toner container 100 is attached to a predetermined position of the image forming apparatus.
- FIG. 4C shows a state between FIG. 4A and FIG.
- the contact member 401 includes a top 401a, an inclined surface 401b inclined to the door 113 side with the top 401a as a boundary, and an inclined surface 401c inclined to the side where the optical scanning device 200 is disposed. Is formed.
- the spring 402 is attached to the other end side of the contact member 401 when the top portion 401a is one end.
- a plurality of toner container holding mechanisms 115 for positioning the collected toner container 114 with respect to the image forming apparatus are provided in the image forming apparatus in addition to the positions shown in FIGS.
- the collected toner container 114 is securely held at a predetermined position of the image forming apparatus by a plurality of toner container holding mechanisms.
- the process cartridges 101Y, 101M, 101C, and 101BK are exchange units that can be attached to and detached from the image forming apparatus main body.
- the image forming apparatus 100 is provided with holding rails 501, 502, 503, 504, and 505 (cartridge holding units) that hold process cartridges.
- the holding rails 501 and 502 hold the process cartridge 101Y.
- the holding rails 501 and 502 have a function of a guide rail (guide member) for guiding the movement of the process cartridge in the + X direction or the ⁇ X direction when the process cartridge 101Y is attached or detached.
- the holding rail 502 and the holding rail 503 hold the process cartridge 101M
- the holding rail 503 and the holding rail 504 hold the process cartridge 101C
- the holding rail 504 and the holding rail 505 hold the process cartridge 101BK. Since the functions of the holding rail 503 to the holding rail 505 are the same as those of the holding rail 501 and the holding rail 502, the description thereof is omitted.
- the collected toner container 114 When the collected toner container 114 is mounted on the image forming apparatus, the collected toner container 114 covers a part of the process cartridge. Therefore, the process cartridge cannot be removed from the image forming apparatus in this state.
- the user when replacing the process cartridge, the user opens the door 113 and then removes the collected toner container 114 from the image forming apparatus 100.
- the process cartridges 101Y, 101M, 101C, and 101BK are slid in the ⁇ X direction as shown in FIG.
- the user slides the process cartridge to be replaced in the ⁇ X direction, and removes the used process cartridge from the main body of the image forming apparatus 100.
- the user slides a new process cartridge in the + X direction and attaches the process cartridge to the main body of the image forming apparatus 100.
- the user attaches the collected toner container 114 to the image forming apparatus 100 and closes the door 113.
- FIG. 6A is a perspective view showing the configuration of the optical scanning device 200
- FIG. 6B is a cross-sectional view of the optical scanning device 200.
- light source units 202Y, 202M, 202C, and 202BK are attached to the outer wall (side wall) of the optical box (housing) 201 of the optical scanning device 200.
- the light source unit 202Y that is a third light source emits a laser beam LY (third light beam) that exposes the photosensitive drum 102Y that is a third photosensitive member.
- the light source unit 202M that is a first light source emits a laser beam LM (first light beam) that exposes the photosensitive drum 102M that is a first photosensitive member.
- the light source unit 202C as the second light source emits a laser beam LC (second light beam) for exposing the photosensitive drum 102C as the second photosensitive member.
- the light source unit 202BK as the fourth light source emits laser light LBK (fourth light beam) for exposing the photosensitive drum 102BK as the fourth photosensitive member.
- the light source units 202Y, 202M, 202C, 202BK are arranged close to each other.
- a plane crossing the polygon mirror 203 with the rotation axis of the polygon mirror 203 as a normal is defined as a virtual plane.
- the laser light LY emitted from the light source unit 202Y and the laser light LBK emitted from the light source unit 202Bk are incident on the reflecting surface of the polygon mirror 203 through an optical path obliquely incident on the virtual plane from the upper side in the gravity direction.
- the laser beam LC emitted from the light source unit 202C and the laser beam LM emitted from the light source unit 202M take an optical path obliquely incident on the virtual plane from the lower side in the gravitational direction and are reflected from the polygon mirror 203. Is incident on.
- a polygon mirror (rotating polygonal mirror) 203 having four reflecting surfaces is installed at the center of the optical box 201.
- the polygon mirror 203 rotates the rotation axis indicated by the dotted line in FIG. 6A in the R1 direction.
- the laser beam LY emitted from the light source unit 202Y enters the reflecting surface of the polygon mirror 203.
- the laser beam LY is deflected (reflected) to the A side shown in FIG.
- the laser beam LM emitted from the light source unit 202M is incident on the same reflecting surface as the reflecting surface of the polygon mirror 203 on which the laser beam LY is incident.
- the laser beam LM is deflected to the same side (A side) as the laser beam LY by the reflection surface of the polygon mirror 203.
- the laser light LBK emitted from the light source unit 202BK is incident on a reflection surface different from the reflection surface on which the laser beams LY and LM are incident.
- the laser beam LBK is deflected by the reflection surface of the polygon mirror 203 to the B side shown in FIG.
- the laser beam LC emitted from the light source unit 202C is incident on the same reflecting surface as the reflecting surface of the polygon mirror 203 on which the laser beam LBK is incident.
- the laser beam LC is deflected to the same side (B side) as the laser beam LBK by the reflection surface of the polygon mirror 203.
- the laser beam LY and the laser beam LBK are deflected to the opposite sides by the polygon mirror 203 with the polygon mirror 203 interposed therebetween.
- the laser beam LM and the laser beam LC are deflected by the polygon mirror 203 to the opposite sides with the polygon mirror 203 interposed therebetween.
- the laser beams LY and LM deflected by the polygon mirror 203 become laser beams that move in the + X direction. That is, by being deflected by the rotating polygon mirror 203, the laser beam LY becomes a laser beam that scans the photosensitive drum 102Y in the + X direction, and the laser beam LM becomes a laser beam that scans the photosensitive drum 102M in the + X direction.
- the laser beams LBK and LC deflected by the polygon mirror 203 become laser beams moving in the ⁇ X direction. That is, by being deflected by the rotating polygon mirror 203, the laser beam LBK becomes a laser beam that scans the photosensitive drum 102BK in the -X direction, and the laser beam LC becomes a laser beam that scans the photosensitive drum 102C in the -X direction. .
- the optical box 201 includes a polygon mirror 203, lenses 206, 207, 208, 209, 210, 211, reflection mirrors 212, 213, 214, 215, 216, 217, and the like. Optical components are attached.
- the optical box 201 is further provided with a cover 218 for dust-proofing the polygon mirror 203, each lens, and each reflection mirror.
- the laser beam LY deflected by the polygon mirror 203 is incident on the reflection mirror 212 after passing through the lens 206 and the lens 207.
- the reflection mirror 212 reflects the incident laser beam LY toward the photosensitive drum 102Y.
- the cover 218 has an opening 219 through which the laser light LY reflected by the reflection mirror 212 passes.
- the opening 219 is closed by a transparent dustproof window 223 (third transparent window) that allows the laser beam LY to pass therethrough.
- the laser beam LY that has passed through the dustproof window 223 forms an image on the photosensitive drum 102Y.
- the laser beam LM deflected by the polygon mirror 203 passes through the lens 206 and then enters the reflection mirror 213.
- the reflection mirror 213 reflects the incident laser beam LM toward the reflection mirror 214 toward the lens 208.
- the laser beam LM reflected by the reflection mirror 213 passes through the lens 208 and enters the reflection mirror 214.
- the reflection mirror 214 reflects the incident laser light LM toward the photosensitive drum 102M.
- the cover 218 has an opening 220 through which the laser light LM reflected by the reflection mirror 214 passes.
- the opening 220 is closed by a transparent dustproof window 224 (first transparent window) that allows the laser light LM to pass therethrough.
- the laser beam LM that has passed through the dustproof window 224 forms an image on the photosensitive drum 102M.
- the laser beam LBK deflected by the polygon mirror 203 passes through the lens 209 and the lens 210 and then enters the reflection mirror 215.
- the reflection mirror 215 reflects the incident laser beam LBK toward the photosensitive drum 102BK.
- the cover 218 has an opening 222 through which the laser light LBK reflected by the reflection mirror 215 passes.
- the opening 222 is closed by a transparent dustproof window 226 (fourth transparent window) that allows the laser beam LBK to pass therethrough.
- the laser beam LBK that has passed through the dustproof window 222 forms an image on the photosensitive drum 102BK.
- the laser beam LC deflected by the polygon mirror 203 enters the reflection mirror 216 after passing through the lens 209.
- the reflection mirror 216 reflects the incident laser light LC toward the lens 211.
- the laser beam LC reflected by the reflection mirror 211 passes through the lens 211 and enters the reflection mirror 217.
- the reflection mirror 217 reflects the incident laser beam LC toward the photosensitive drum 102C.
- the cover 218 has an opening 221 through which the laser light LC reflected by the reflection mirror 218 passes.
- the opening 221 is closed by a transparent dustproof window 225 (second transparent window) that allows the laser light LC to pass therethrough.
- the laser beam LC that has passed through the dustproof window 225 forms an image on the photosensitive drum 102C.
- cover 218 The cover 218 will be described. As shown in FIG. 7A, a cover 218 is attached to the optical box 201 in order to close the internal space of the optical box 201.
- the cover 218 is provided with a plurality of hook portions 218a.
- the cover 218 is attached to the optical box 201 by a snap-fit structure in which the plurality of hook portions 218a are engaged with the plurality of protrusions 220a provided on the outer wall of the optical box. It is done.
- the cover 218 includes a recess 218 b that falls toward the inside of the optical box 201 on the facing surface 218 g of the cover 218 that faces the shutter 300, and toward the outside of the optical box 201. Projecting convex portions 218c (first convex portions) and 218d (second convex portions) are provided.
- the shutter 300 is a member for preventing foreign matters such as toner from adhering to the dustproof windows 223, 224, 225, and 226.
- the shutter 300 covers the dustproof windows 223, 224, 225, and 226.
- FIG. 7B is a perspective view showing the shutter 300 attached to the optical scanning device so as to cover the cover 218.
- the shutter 300 is a single plate-like resin member that faces the cover 218 and is a common member that covers the dustproof windows 223, 224, 225, and 226 of the cover 218.
- the outer shape of the shutter 300 is a rectangle that is substantially the same as the outer shape of the cover 218 of the optical scanning device.
- the shutter 300 includes an opening 323 that allows the laser light LY that has passed through the dust-proof window 223 to pass, an opening 324 that allows the laser light LM that has passed through the dust-proof window 224 to pass, and an opening 325 that allows the laser light LC that has passed through the dust-proof window 225 to pass.
- the shutter 300 is formed with a long hole 301 for attaching a spring 310 which is an elastic body to be described later.
- elongated holes 302 and 303 are formed in the shutter 300.
- the convex part 218c of the cover 218 is inserted into the long hole 302 (first insertion part).
- the convex part 218d of the cover 218 is inserted into the elongated hole 303 (second insertion part).
- the long holes 302 and 303 and the convex portions 218c and 218d are engaging mechanisms in which the long hole 302 and the convex portion 218c and the long hole 303 and the convex portion 218d engage with each other, and the moving direction (sliding direction) of the cover 218 is changed. It functions as a guide mechanism that restricts in the Y-axis direction. Since the long hole 302 and the long plan 303 are long holes in a direction parallel to the Y axis of the shutter 300, the movement of the shutter 300 is performed in a reciprocating direction parallel to the Y axis by the long holes 302 and 303 and the convex portions 218c and 218d. Be regulated.
- the shutter 300 may be attached to the image forming apparatus side.
- the convex portion may be provided on the shutter 300 side
- the concave portion (insertion portion) corresponding to the elongated hole may be provided on the cover 218 side
- the convex portion provided on the shutter 300 side may be inserted into the concave portion to serve as a guide member.
- the shutter 300 is provided to prevent dust such as toner from adhering to the dustproof windows 223, 224, 225, and 226 of the cover 218.
- the shutter 300 moves when a mechanism for moving the shutter described below operates.
- FIG. 8A is a top view of the shutter moving mechanism, the shutter, and the optical scanning device provided in the image forming apparatus 100 main body.
- FIG. 8B is a top view of the rotation mechanism 803 constituting a part of the shutter moving mechanism.
- the rotation mechanism 803 includes a rotation shaft 804, a rotation unit 805, a first arm unit 806, and a second arm unit 807.
- the rotation shaft 804 is a fixed shaft provided in the main body of the image forming apparatus 100 and having a circular cross section.
- the rotation unit 805, the first arm unit 806, and the second arm unit 807 constitute one rotation member, and the shaft 804 passes through an opening 808 provided in the rotation unit 805.
- a first arm portion 806 and a second arm portion 807 extend from the rotating portion 805 in the radial direction of the shaft 804.
- the rotating member constituted by the rotating unit 805, the first arm unit 806, and the second arm unit 807 has a rotating shaft 804 as a center of rotation (having a circular cross section of the rotating shaft 804). It can rotate in the clockwise direction (first rotation direction) and the counterclockwise direction (second rotation direction: the direction opposite to the first rotation direction) with the center as the rotation center.
- FIG. 9A is a cross-sectional view taken along the line AA in FIG.
- FIG. 9B is an enlarged perspective view of the recess 218 b provided in the cover 218.
- FIG. 9C shows an enlarged perspective view of the opening 301 of the shutter 300.
- FIG. 9D is an enlarged cross-sectional view of the attachment portion of the spring 310.
- the recess 218b of the cover 218 is provided with an engaging portion 218e (second connecting portion) with which one end of a spring 310 such as a coil spring engages.
- the shutter 300 is provided with an engaging portion 304 (first connecting portion) with which the other end of the spring 310 is engaged. That is, the cover 218 and the shutter 300 are connected by the spring 310.
- the bottom surface 218f of the recess 218b of the cover 218 is closer to the optical box 201 than the dustproof windows 223, 224, 225, 226 in the rotation axis direction (Z-axis direction) of the polygon mirror 203. It is provided on the bottom side.
- the concave portion 218b is provided on an extension of the optical path of the laser light that is emitted from the light source units 202Y, 202M, 202C, and 202BK and enters the polygon mirror 203. That is, when viewed from the rotation axis direction of the polygon mirror 203, the recess 218b is provided on the opposite side of the light sources 202Y, 202M, 202C, and 202BK with the polygon mirror 203 interposed therebetween.
- 8A indicates the arrangement position of the rotary polygon mirror, and line segments 801 and 802 indicate the scanning region end portions of the laser light deflected by the polygon mirror 203. In FIG.
- the scanning area refers to an effective scanning area corresponding to one end to the other end of the electrostatic latent image formed on the photosensitive drum in the rotation axis direction of each photosensitive drum.
- the recess 218b of the cover 218 avoids the optical path of each laser beam deflected by the polygon mirror 203 inside the optical scanning device. In the position. Therefore, it is possible to provide a recess 218b that protrudes to the inside of the optical scanning device from the position of the dustproof window in the rotation axis direction of the polygon mirror 203 without interfering with the optical path of each laser beam inside the optical scanning device.
- a connecting portion to which the spring 310 is connected is provided on the bottom surface 218f of the recess 218b so that the spring 310 can be received in the recess 218b.
- the spring 310 does not have to be provided on the facing surface 218g, and therefore the optical scanning device 200 in the rotation axis direction of the polygon mirror 203 can be provided. Larger size can be avoided. Further, since the shutter 300 and the cover 218 can be disposed close to each other, an increase in the size of the guide members such as the convex portions 218c and 218d can be suppressed.
- FIG. 10A is a top view showing a state before the collected toner container 114 is attached to the toner container holding mechanism 115.
- the shutter 300 covers openings 223, 224, 225, and 226 provided in the cover 218. Even if the laser beams LY, LM, LC, and LBK are emitted, Laser light is blocked by the shutter.
- the state shown in FIG. 10A is the shutter closed state where the shutter 300 shields the laser light, or the state where the shutter 300 is located at the second position located on the optical path of the laser light.
- FIG. 10B is a top view of the state in which the collected toner container 114 is held by the toner container holding mechanism 115.
- the shutter 300 is located at the first position retracted from the optical path of the laser light. Therefore, the laser beams LY, LM, LC, and LBK can pass through the openings 223, 224, 225, and 226 of the shutter 300.
- the state shown in FIG. 10A is a shutter open state where the shutter 300 does not block the laser beam.
- FIG. 11A is an enlarged view of the rotation mechanism 803 in the state of FIG.
- the movement of the shutter in the + Y direction is defined as the movement in the first direction
- the movement in the ⁇ Y direction is defined as the movement in the second direction
- the movement in the + Y direction of the shutter may be defined as the movement in the second direction
- the movement in the ⁇ Y direction may be defined as the movement in the first direction.
- the tip end portion 806a of the first arm portion 806 moves in the arrow C direction on the first flat surface 114b1 of the protrusion 114b.
- the first arm portion 806 turns (moves) clockwise around the rotation shaft 804, and at the same time, the second arm portion 807 is moved. Also turns (moves) in the clockwise direction (FIG. 11B).
- the shutter 300 pressed by the distal end portion 807a of the second arm portion 807 turned (moved) by turning the first arm portion 806 slides in the ⁇ Y direction (short direction of the transparent window).
- the spring 310 expands.
- the amount of movement of the shutter 300 in the ⁇ Y direction is increased by the elastic force of the spring 310 (the biasing force by which the spring 310 biases the shutter 300 in the + direction).
- the elastic force of the spring 310 acts on the shutter 300 in the + Y direction. Therefore, the state where the shutter 300 and the distal end portion 807a of the second arm portion 807 are in contact with each other is maintained.
- the first arm 806 and the second arm 807 are rotated clockwise by the movement of the collected toner container 114 in the + X direction. Turn in the direction. Then, the shutter 300 pressed by the second arm 807 further slides in the ⁇ Y direction (FIG. 11C).
- the collected toner container 114 is not completely held by the toner container holding mechanism 115 of the image forming apparatus 100, and can further move in the + X direction.
- the tip end portion 806a of the first arm portion 806 comes into contact with the second flat surface 114b2 of the protrusion 114b.
- the second plane 114b2 is a plane parallel to the X axis. Therefore, even if the front end portion 806a of the first arm portion 806 moves on the second plane 114b, the first arm portion 806 and the second arm portion 807 can move in either clockwise or counterclockwise directions. Do not turn.
- Portion (first contact portion), engagement portion 304 as a contact portion (second contact portion) between shutter 300 and spring 310, and engagement portion 218e as a contact portion between spring 310 and cover 218 are substantially straight.
- the direction in which the force is applied from the second arm 807 to the shutter 300 and the direction in which the force is applied from the spring 310 to the shutter 300 are substantially collinear (on the dotted line in FIG. 10A).
- the convex portion 218c inserted into the long hole 302 and the convex portion 218d inserted into the long hole 303 are arranged on the dotted line in FIG.
- the pressing force pressing the shutter 300 in the ⁇ Y direction by the second arm portion 807 is applied to the convex portion 218c and the convex portion 218d from the long hole 302 and the long hole 303 of the shutter 300, respectively. Conversion to force acting in the X-axis direction can be suppressed.
- the elastic force of the spring 310 that biases the shutter 300 in the ⁇ Y direction is converted into a force acting in the X-axis direction from the elongated hole 302 and the elongated hole 303 of the shutter 300 to the convex portion 218c and the convex portion 218d, respectively.
- the contact portion between the second arm portion 807 and the shutter 300 is It is defined that an engagement portion 304 that is a contact portion between the shutter 300 and the spring 310 and an engagement portion 218e that is a contact portion between the spring 310 and the cover 218 are substantially on a straight line.
- the convex portion 218d is provided between the dustproof window 223 and the dustproof window 224 of the cover 218, and the convex portion 218c is provided between the dustproof window 225 and the dustproof window 226.
- a long hole 303 is provided between the opening 323 and the opening 324 of the shutter 300, a long hole 302 is provided between the opening 325 and the opening 326, and an opening 301 is provided between the opening 324 and the opening 325.
- the engaging portion 218e which is a contact portion between the joining portion 304 spring 310 and the cover 218, the convex portion 218c inserted into the elongated hole 302, and the convex portion 218d inserted into the elongated hole 303 can be arranged on a substantially straight line. .
- FIG. 12 is a diagram showing the magnitude of the force in the ⁇ X direction that acts on the collected toner container 114 from the first arm portion 806. (A) to (d) shown on the horizontal axis in FIG. 12 correspond to FIGS. 11 (a) to (d), respectively.
- the force of Fa acts in the + Y direction from the shutter 113 to the second arm portion 807 by the elastic force of the spring 310 that biases the shutter 300 due to the extension of the spring 310.
- the force of F′a corresponding to Fa acts on the first plane 114b1 from the first contact portion 806a of the first arm portion 806.
- the recovered toner container 114 in the state shown in FIG. Works.
- a force of about 130 gf acts on the collected toner container 114 in the ⁇ X direction in the state shown in FIG.
- the force acting on the collected toner container 114 in the ⁇ X direction is 0 gf. Become. Therefore, in FIG. 11D, the collected toner container 114 is in a state where it is difficult to drop off from the toner container holding mechanism 115.
- the second plane 114b2 does not necessarily have to be parallel to the X axis, and it is desirable to make the inclination angle of the second plane 114b2 smaller than the inclination angle of the first plane 114b1 with respect to the X axis.
- the contact portion 806a does not need to be configured by only two planes such as the first plane 114b1 and the second plane 114b2, and may be configured by three or more planes. Further, the shape of the contact portion 806a may be a curved surface in which the inclination angle with respect to the virtual plane becomes gentler in the ⁇ X direction.
- the concave portion 218b is provided on the facing surface 218g of the cover 218 facing the shutter 300, and the spring 310 for sliding the shutter 300 is connected to the connecting portion 218e provided on the concave portion 218b. And the enlargement of the structure of an optical scanning device can be suppressed.
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Abstract
Description
(画像形成装置)
図1は、電子写真方式の画像形成装置100の概略断面図である。図1に示す画像形成装置100は、イエロー、マゼンタ、シアン、ブラックの各色のトナー像を形成する4基の画像形成部101Y、101M、101C、101BKを備える。画像形成部101Y、101M、101C,101BKは、それぞれ感光体であるところの感光ドラム102Y、102M、102C、102BKを備える。また、各画像形成部は、感光ドラム102Y、102M、102C、102BKを帯電する帯電装置103Y、103M、103C、103BK、感光ドラム上の静電潜像をトナーを用いて現像する現像装置104Y、104M、104C、104BKを備える。さらに、各画像形成部は、感光ドラム上の残留トナーを感光ドラム上から除去するクリーニング装置111Y、111M、111C,111BK、を備える。
図2は、画像形成装置100の外観の斜視図である。図2に示すように、本実施例の画像形成装置100はメンテナンス用の扉113を備えている。画像形成装置100の扉113の内側には回収トナー容器114が取り付けられている。回収トナー容器114は、クリーニング装置111Y、111M、111C、111BKが各感光ドラム上から回収したトナー、及びクリーニング装置112が中間転写ベルト106上から回収したトナーを蓄積する。回収トナー容器114は、画像形成装置100の本体に対して着脱可能な交換ユニットである。ユーザは、図示しない表示部に回収トナー容器114の交換を促す表示がされることによって、回収トナー容器114を交換する作業を行う。
図3(a)は、回収トナー容器114とクリーニング装置112との接続状態を示す図である。図3(b)は、回収トナー容器114の斜視図である。
図4(a)は、画像形成装置100に回収トナー容器114が取り付けられた状態を示す図である。画像形成装置100は、ユーザが容易に着脱できる程度に回収トナー容器114を保持するトナー容器保持機構115(トナー容器保持部)を備える。トナー容器保持機構115は、回収トナー容器114に設けられた突起114c(位置決め用突起)に接触する接触部材401、接触部材401に取り付けられるバネ402を備える。
図4(b)から(d)は、トナー容器保持機構115周辺の拡大図であり、回収トナー容器114を画像形成装置に対して着脱する際のトナー容器保持機構115の動作例を説明する図である。図4(b)は、回収トナー容器114が各クリーニング装置からトナーを受け取る位置(所定の位置)に取り付けられる前の状態を示している。図4(d)は、回収トナー容器100が画像形成装置の所定の位置に取り付けられた状態を示している。図4(c)は、図4(a)と図4(d)との間の状態を示している。
ユーザは、回収トナー容器114を画像形成装置に取り付けるべく、図4(b)の+X方向に回収トナー容器114を移動させると、図4(c)に示すように、回収トナー容器114に設けられた位置決め用突起114cが傾斜面401bに接触する。ユーザがさらに+X方向に回収トナー容器114を移動させると、傾斜面401bが位置決め用突起114cに押圧される。すると、バネ402が収縮し、位置決め用突起114cに押圧された接触部材401は、-Z方向に移動する。ユーザがさらに回収トナー容器114を+X方向に移動させると、位置決め用突起114cの下端と頂部401aとが接触した状態となる。
位置決め用突起114cの下端と頂部401aとが接触した状態からユーザがさらに回収トナー容器114を+X方向に移動させると、位置決め用突起114cが傾斜面401cに接触した状態となり、接触部材401が図4(d)に示す+Z方向に移動する。回収トナー容器114が画像形成装置の所定の位置まで移動すると、図4(d)に示すように接触部材401に位置決め用突起114cが係合した状態となり、回収トナー容器114の-X方向への移動が規制され、回収トナー容器114が画像形成装置の所定の位置に取り付けられた状態となる。なお、回収トナー容器114を画像形成装置に対して位置決めするためのトナー容器保持機構115は、図4(a)及び(b)に示す位置の他に画像形成装置に複数設けられている。複数のトナー容器保持機構によって回収トナー容器114を画像形成装置の所定の位置に確実に保持する。
上述したように、プロセスカートリッジ101Y、101M、101C、101BKは、画像形成装置本体に対して着脱可能な交換ユニットである。図5(b)に示すように、画像形成装置100には、プロセスカートリッジを保持する保持レール501、502、503、504、505(カートリッジ保持部)が設けられている。保持レール501及び502は、プロセスカートリッジ101Yを保持する。また、保持レール501及び502は、プロセスカートリッジ101Yを着脱する際に+X方向または-X方向へのプロセスカートリッジの移動を案内するガイドレール(ガイド部材)の機能を有する。保持レール502及び保持レール503は、プロセスカートリッジ101Mを保持し、保持レール503及び保持レール504は、プロセスカートリッジ101Cを保持し、保持レール504及び保持レール505は、プロセスカートリッジ101BKを保持する。保持レール503から保持レール505の機能は、保持レール501及び保持レール502と同様であるので説明を省略する。
次に、光走査装置200について説明する。図6(a)は、光走査装置200の構成を示す斜視図であり、図6(b)は光走査装置200の断面図である。
図6(a)に示すように、光走査装置200の光学箱(筐体)201の外壁(側壁)には、光源ユニット202Y、202M、202C、202BKが取り付けられている。第3の光源である光源ユニット202Yは、第3の感光体である感光ドラム102Yを露光するレーザ光LY(第3の光ビーム)を出射する。第1の光源である光源ユニット202Mは、第1の感光体である感光ドラム102Mを露光するレーザ光LM(第1の光ビーム)を出射する。第2の光源である光源ユニット202Cは、第2の感光体である感光ドラム102Cを露光するレーザ光LC(第2の光ビーム)を出射する。第4の光源である光源ユニット202BKは、第4の感光体である感光ドラム102BKを露光するレーザ光LBK(第4の光ビーム)を出射する。
ポリゴンミラー203によって偏向されたレーザ光LMは、レンズ206を通過した後、反射ミラー213に入射する。反射ミラー213は、入射したレーザ光LMを反射ミラー214に向かってレンズ208に向かって反射する。反射ミラー213によって反射されてレーザ光LMは、レンズ208を通過して反射ミラー214に入射する。反射ミラー214は、入射したレーザ光LMを感光ドラム102Mに向かって反射する。カバー218には、反射ミラー214が反射したレーザ光LMを通過させる開口220が形成されている。その開口220は、レーザ光LMを通過させる透明の防塵窓224(第1の透明窓)によって閉塞されている。防塵窓224を通過したレーザ光LMは、感光ドラム102Mに結像する。
カバー218について説明する。図7(a)に示すように、光学箱201の内部空間を閉塞するために光学箱201にはカバー218が取り付けられる。カバー218には複数のフック部218aが設けられており、カバー218は光学箱の外壁に設けられた複数の突起220aに複数のフック部218aそれぞれを係合させるスナップフィット構造によって光学箱201に取り付けられる。なお、図7(a)に示すように、カバー218には、シャッタ300に対向するカバー218の対向面218gに光学箱201の内側に向かって落ち込む凹部218bと、光学箱201の外側に向かって突出する凸部218c(第1の凸部)、218d(第2の凸部)が設けられている。
続いて、シャッタ300について説明する。シャッタ300は、防塵窓223、224、225、226にトナーなどの異物が付着しないようにするための部材である。画像形成装置のメンテナンスをするために、ユーザが扉113を開いてプロセスカートリッジを着脱するとき、プロセスカートリッジの移動によってカートリッジからトナーが落下する場合がある。そのため、少なくともプロセスカートリッジを交換する場合は、シャッタ300が防塵窓223、224、225、226を覆った状態にすることが望ましい。
本実施例のシャッタ300は、カバー218の防塵窓223、224、225、226にトナーなどの塵埃が付着することを抑制するために設けられている。シャッタ300は、以下で説明するシャッタを移動させる機構が動作することによって移動する。
図8(a)は、画像形成装置100本体に設けられたシャッタ移動機構、シャッタ、及び光走査装置の上面図である。図8(b)は、シャッタ移動機構の一部を構成する回動機構803の上面図である。
次に、図10及び図11を用いてシャッタ移動機構(シャッタ開閉機構)の動作について説明する。
図10(b)は、回収トナー容器114がトナー容器保持機構115に保持された状態の上面図である。図10(b)において、シャッタ300は、レーザ光の光路上から退避した第1の位置に位置する。そのため、レーザ光LY、LM、LC、LBKは、シャッタ300の開口223、224、225、及び226を通過することができる。本実施例では、図10(a)の状態をシャッタ300がレーザ光を遮光しないシャッタ開状態とする。
第1の腕部806と突起部114bの第2の平面114b2との接触点が図11(d)に示す位置のとき、図4(d)に示すように回収トナー容器114はトナー容器保持機構115に保持された状態となる。第2の平面114b2をX軸と平行な平面とすることによって、第1の腕部806の先端部806aと第2の平面114b2とが接触した状態において第1の腕部806の先端部806aから突起部114bに対して-X方向への力が作用しない。このように第2の平面114b2を設けることによって、振動等により図4(d)の状態においてトナー容器保持機構115から回収トナー容器114が-X方向に離脱することを抑制することができる。
なお、X軸方向において、第2の腕部807とシャッタ300との接触部の位置は、第2の腕部807の回転移動によって微小に変化する。そこで、本実施例の画像形成装置は、第2の腕部807の移動に伴う第2の腕部807とシャッタ300との接触部の移動範囲をX軸方向における長穴の両端の幅以内に収まるように設計されている。本実施例では、第2の腕部807とシャッタ300との接触部の移動範囲がX軸方向における長穴の両端の幅に収まる限り、第2の腕部807とシャッタ300との接触部とシャッタ300とバネ310との接触部である係合部304と、バネ310とカバー218との接触部である係合部218eが略直線上にあるものと定義する。
218b 凹部
218c、218d 凸部
218e 係合部
218g 対向面
302、303 長穴
300 シャッタ
310 バネ
Claims (10)
- 第1の感光体を露光するための第1の光ビームを出射する第1の光源と、
第2の感光体を露光するための第2の光ビームを出射する第2の光源と、
前記第1の光ビームが前記第1の感光体を走査し、前記第2の光ビームが前記第2の感光体を走査するように前記第1の光ビーム及び前記第2の光ビームを偏向する回転多面鏡であって、前記第1の光ビームと前記第2の光ビームとを当該回転多面鏡を挟んで互いに反対側に偏向する回転多面鏡と、
前記第1の光源、前記第2の光源、及び前記回転多面鏡が配置される光学箱と、
前記光学箱を閉塞するカバーであって、前記回転多面鏡によって偏向された前記第1の光ビームを通過させる第1の透明窓と前記回転多面鏡によって偏向された前記第2の光ビームを通過させる第2の透明窓とが前記回転多面鏡を挟んで互いに逆側に配置されたカバーと、
前記カバーと対向するように配置され、前記第1の透明窓及び前記第2の透明窓を覆う位置と前記第1の透明窓を通過した前記第1の光ビームの光路上及び前記第2の透明窓を通過した前記第2の光ビームの光路上から退避した位置との間を往復するようにスライドするシャッタと、
前記シャッタを押圧することによって前記シャッタをスライドさせる押圧手段と、前記シャッタと前記カバーとに連結され、前記押圧手段によって押圧された前記シャッタの移動量が増加するにつれて前記押圧手段が押圧する方向と反対方向に前記シャッタを付勢させる弾性力が増加するように変形し、前記弾性力によって前記反対方向に前記シャッタをスライドさせるバネと、を有するシャッタ移動機構と、を備え、
前記シャッタに対向する前記カバーの対向面には、前記回転多面鏡を挟んで前記第1の光源および前記第2の光源と反対側であり、かつ前記第1の透明窓と前記第2の透明窓との間に前記カバーによって閉塞された光学箱の内部側に落ち込む凹部が設けられ、前記凹部には前記シャッタに連結された前記バネが連結される連結部が設けられていることを特徴とする画像形成装置。 - 前記回転多面鏡に対して前記第1の感光体と同じ側であり前記第1の感光体よりも遠い位置に配置された第3の感光体を露光するための第3の光ビームを出射する第3の光源と、
前記回転多面鏡に対して前記第2の感光体と同じ側であり前記第2の感光体よりも遠い位置に配置された第4の感光体を露光するための第4の光ビームを出射する第4の光源と、を備え、
前記第3の光ビームは、前記第3の光ビームが前記第3の感光体を走査するように前記回転多面鏡によって前記第1の光ビームと同じ側に偏向され、
前記第4の光ビームは、前記第4の光ビームが前記第4の感光体を走査するように前記回転多面鏡によって前記第2の光ビームと同じ側に偏向され、
前記カバーは、前記回転多面鏡に対して前記第1の透明窓よりも遠い位置に配置され、前記回転多面鏡によって偏向された前記第3の光ビームを通過させる第3の透明窓と、前記回転多面鏡に対して前記第2の透明窓よりも遠い位置に配置され、前記回転多面鏡によって偏向された前記第4の光ビームを通過させる第4の透明窓と、を備えることを特徴とする請求項1に記載の画像形成装置。 - 前記凹部は、前記回転多面鏡の回転軸方向から見たときに前記回転多面鏡によって偏向された前記第1の光ビーム及び前記第2の光ビームの光路を遮らない位置に設けられていることを特徴とする請求項1に記載の画像形成装置。
- 前記凹部は、前記回転多面鏡の回転軸方向から見たときに前記回転多面鏡によって偏向された前記第1の光ビーム、前記第2の光ビーム、前記第3の光ビーム、及び前記第4の光ビームの光路を遮らない位置に設けられていることを特徴とする請求項2に記載の画像形成装置。
- 前記シャッタと前記シャッタを押圧する前記押圧手段との第1の接触部と、前記シャッタと前記バネとの連結部と、前記カバーと前記バネとの前記連結部と、が略直線上に位置することを特徴とする請求項1乃至4いずれか1項に記載の画像形成装置。
- 前記カバーの前記第1の透明窓と前記第3の透明窓との間の前記対向面に設けられた凸部と、前記シャッタに設けられ、前記凸部が挿入される挿入部と、を含み、前記挿入部に挿入された凸部によって前記シャッタのスライド方向を規制するガイド機構を備え、
前記シャッタと前記シャッタを押圧する前記押圧手段との第1の接触部と、前記シャッタと前記バネとの連結部と、前記カバーと前記バネとの前記連結部と、前記凸部とが略直線上に位置することを特徴とする請求項2または4に記載の画像形成装置。 - 前記カバーの前記第1の透明窓と前記第3の透明窓との間の前記対向面に設けられた第1の凸部と、前記カバーの前記第2の透明窓と前記第4の透明窓との間の前記対向面に設けられた第2の凸部と、前記シャッタに設けられ、前記第1の凸部が挿入される第1の挿入部と、前記シャッタに設けられ、前記第2の凸部が挿入される第2の挿入部と、を含み、前記第1の挿入部に挿入された前記第1の凸部及び前記第2の挿入部に挿入された前記第2の凸部とによって前記シャッタのスライド方向を規制するガイド機構を備え、
前記シャッタと前記シャッタを押圧する前記押圧手段との第1の接触部と、前記シャッタと前記バネとの連結部と、前記カバーと前記バネとの前記連結部と、前記第1の凸部と、前記第2の凸部とが略直線上に位置することを特徴とする請求項2または4に記載の画像形成装置。 - 前記シャッタに設けられた凸部と、前記カバーの前記第1の透明窓と前記第3の透明窓との間の前記カバーの前記対向面に設けられ、前記凸部が挿入される挿入部と、を含み、前記挿入部に挿入された凸部によって前記シャッタのスライド方向を規制するガイド機構を備えることを特徴とする請求項1または2に記載の画像形成装置。
- 前記シャッタに設けられた凸部と、前記カバーの前記第1の透明窓と前記第3の透明窓との間の前記対向面に設けられ、前記凸部が挿入される挿入部と、を含み、前記挿入部に挿入された凸部によって前記シャッタのスライド方向を規制するガイド機構を備え、
前記シャッタと前記シャッタを押圧する前記押圧手段との第1の接触部と、前記シャッタと前記バネとの連結部と、前記カバーと前記バネとの前記連結部と、前記凸部とが略直線上に位置することを特徴とする請求項2または4に記載の画像形成装置。 - 前記シャッタに設けられた第1の凸部及び前記第2の凸部と、前記カバーの前記第1の透明窓と前記第3の透明窓との間の前記対向面に設けられ、前記第1の凸部が挿入される第1の挿入部と、前記カバーの前記第2の透明窓と前記第4の透明窓との間の前記対向面に設けられ、前記第2の凸部が挿入される第2の挿入部と、を含み、前記第1の挿入部に挿入された前記第1の凸部及び前記第2の挿入部に挿入された前記第2の凸部とによって前記シャッタのスライド方向を規制するガイド機構を備え、
前記シャッタと前記シャッタを押圧する前記押圧手段との第1の接触部と、前記シャッタと前記バネとの連結部と、前記カバーと前記バネとの前記連結部と、前記第1の凸部と、前記第2の凸部とが略直線上に位置することを特徴とする請求項2または4に記載の画像形成装置。
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PCT/JP2012/083847 WO2014102958A1 (ja) | 2012-12-27 | 2012-12-27 | 画像形成装置 |
BR112015014234A BR112015014234A2 (pt) | 2012-12-27 | 2012-12-27 | aparelho de formação de imagem |
CN201280078010.6A CN104885019B (zh) | 2012-12-27 | 2012-12-27 | 成像设备 |
EP12890680.7A EP2942670B1 (en) | 2012-12-27 | 2012-12-27 | Image forming device |
US14/138,874 US9207559B2 (en) | 2012-12-27 | 2013-12-23 | Image forming apparatus including a light scanning device, tranparent window for passing a laser beam and a mechanism for moving a shutter |
US14/931,712 US9618876B2 (en) | 2012-12-27 | 2015-11-03 | Image forming apparatus |
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US7872664B2 (en) * | 2005-09-26 | 2011-01-18 | Ricoh Company, Limited | Optical scanning device including shutter member that closes or opens an emission window and image forming apparatus including the optical scanning device |
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US9207559B2 (en) | 2015-12-08 |
CN104885019A (zh) | 2015-09-02 |
EP2942670A1 (en) | 2015-11-11 |
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EP2942670B1 (en) | 2020-09-16 |
US20160124339A1 (en) | 2016-05-05 |
BR112015014234A2 (pt) | 2017-07-11 |
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US20140184719A1 (en) | 2014-07-03 |
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