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    Image forming apparatus
    1.
    发明授权
    Image forming apparatus 有权

    公开(公告)号：US12099312B2

    公开(公告)日：2024-09-24

    申请号：US17848335

    申请日：2022-06-23

    申请人： CANON KABUSHIKI KAISHA

    发明人： Shingo Ito ,  Masashi Tanaka

    IPC分类号： G03G15/00 ,  G02B26/12 ,  G03G15/04 ,  G03G15/043

    CPC分类号： G03G15/043 ,  G02B26/125 ,  G03G15/04072

    摘要： An image forming apparatus includes an exposure unit that reflects a laser beam emitted from a light source by a polygon mirror having a plurality of reflection surfaces to form a latent image on a photosensitive member, and a control unit that controls the image forming apparatus in a plurality of operation modes including a normal mode and a low speed mode having a slower process speed than the normal mode. The control unit controls the polygon mirror to use all of the plurality of reflection surfaces to reflect the laser beam when in the normal mode. When in the low speed mode, the control unit makes the process speed faster than 0.5 times that of the normal mode, rotates the polygon mirror faster than in the normal mode, and controls the polygon mirror to use only some of the plurality of reflection surfaces to reflect the laser beam.

    Image forming apparatus with switched process speeds and resolutions
    3.
    发明授权
    Image forming apparatus with switched process speeds and resolutions 有权

    公开(公告)号：US11835881B2

    公开(公告)日：2023-12-05

    申请号：US17841599

    申请日：2022-06-15

    申请人： CANON KABUSHIKI KAISHA

    发明人： Tomonori Sato

    IPC分类号： G03G15/04 ,  G02B26/12 ,  G03G15/043

    CPC分类号： G03G15/04072 ,  G02B26/124 ,  G03G15/043 ,  G03G15/0435 ,  G03G2215/0404

    摘要： An image forming apparatus includes a scanning means provided with a light source, a polygon mirror and a driving means for driving rotation of the polygon mirror; a photosensitive member, a developing means, and a detecting means for detecting a laser light from the light source. A controller controls to execute a light emission operation so that an area including an image forming area of the photosensitive member is irradiated with the laser light. The controller controls to execute a switching operation in which a rotational speed of the polygon mirror is switched from a first speed to a second speed different from the first speed. The controller controls to execute the light emission operation in a state in which the photosensitive member and the developing means are in contact and are rotating, and to execute the switching operation based on a detecting result of the detecting means in the light emission operation.

    OPTICAL SCANNING DEVICE
    5.
    发明申请
    OPTICAL SCANNING DEVICE 审中-公开

    公开(公告)号：US20190243279A1

    公开(公告)日：2019-08-08

    申请号：US16386039

    申请日：2019-04-16

    申请人： CANON KABUSHIKI KAISHA

    发明人： Jun Nagatoshi ,  Mitsuhiro Ohta ,  Shunsuke Tanaka

    IPC分类号： G03G15/04 ,  G02B26/10 ,  G02B26/12

    CPC分类号： G03G15/04036 ,  G02B26/10 ,  G02B26/12 ,  G03G15/04072

    摘要： In one embodiment, an optical scanning device includes a board and a light receiving member, the positional accuracy of which is improved. When a length in a scanning direction and a length in an intersection direction of a body portion of the light receiving member are denoted by Lx0 and Ly0, respectively, and a length in the scanning direction and a length in the intersection direction of a through-hole formed in the board are denoted by Lx1 and Ly1, respectively, the lengths Lx0, Ly0, Lx1, and Ly1 satisfy the following formula: (Lx1−Lx0)>(Ly1−Ly0).

    IMAGE FORMING APPARATUS
    6.
    发明申请
    IMAGE FORMING APPARATUS 审中-公开

    公开(公告)号：US20190196355A1

    公开(公告)日：2019-06-27

    申请号：US16227980

    申请日：2018-12-20

    申请人： Yuuichiroh UEMATSU ,  Satoshi Kaneko ,  Terumichi Ochi ,  Shuji Hirai

    发明人： Yuuichiroh UEMATSU ,  Satoshi Kaneko ,  Terumichi Ochi ,  Shuji Hirai

    IPC分类号： G03G15/043 ,  G03G15/04

    CPC分类号： G03G15/043 ,  G03G15/04072 ,  G03G15/5058 ,  G03G2215/00033 ,  G03G2215/00037

    摘要： An image forming apparatus includes a latent image bearer; a writing device configured to write a latent image onto the latent image bearer; a detection device configured to detect, at a plurality of positions, a density of a toner image obtained through development of the latent image; and a controller configured to correct a writing intensity of the writing device to correct an uneven density based on detection values of the detection device. The controller determines whether each of the detection values is pass or fail. In response to a determination that a detection value is fail, the controller corrects the wiring intensity based on another detection value determined to be pass at a position different from a position at which the detection value is determined to be fail, instead of correcting the writing intensity based on the detection value determined to be fail.

    IMAGE FORMING APPARATUS
    7.
    发明申请
    IMAGE FORMING APPARATUS 审中-公开

    公开(公告)号：US20190171127A1

    公开(公告)日：2019-06-06

    申请号：US16321225

    申请日：2018-06-08

    申请人： KYOCERA Document Solutions Inc.

    发明人： Seiji TAKI

    IPC分类号： G03G15/043 ,  G03G15/04 ,  H04N1/00 ,  H04N1/113

    CPC分类号： G03G15/043 ,  G03G15/04072 ,  G03G15/5062 ,  G03G15/55 ,  H04N1/00087 ,  H04N1/1135

    摘要： Provided is an image forming apparatus configured to acquire a density of a test print image at each position in the main scanning direction, which is read by the image reading unit after a first test print image is formed, to correct a setting value of an exposure amount of an exposure device to a first light amount, which is higher than a reference light amount that is an exposure amount when the first test print image is formed, in an area where the acquired density is lower than a target density, to correct the exposure amount of the exposure device to a second light amount, which is lower than the reference light amount, in an area where the acquired density is higher than the target density, and to form a second test print image. On the basis of the second test print image, density correction is performed.

    CIRCUIT FOR DRIVING A LIGHT SOURCE IN IMAGING DEVICE FOR ENHANCING QUALITY OF ISOLATED PIXELS
    9.
    发明申请
    CIRCUIT FOR DRIVING A LIGHT SOURCE IN IMAGING DEVICE FOR ENHANCING QUALITY OF ISOLATED PIXELS 审中-公开

    公开(公告)号：US20180284638A1

    公开(公告)日：2018-10-04

    申请号：US15472733

    申请日：2017-03-29

    申请人： LEXMARK INTERNATIONAL, INC.

    发明人： JOHN BRUCE BERRY ,  WILLIAM POHL CORBETT, JR. ,  ROBERT MICHAEL TULENKO

    IPC分类号： B41J2/385

    CPC分类号： G03G15/043 ,  G03G15/04072

    摘要： An imaging device has a photoconductor with a surface that is selectively discharged by a light from a laser diode to create a latent electrostatic image for attracting toner for transfer to a media. A circuit drives the laser diode. The circuit has a switch for turning on and off the light, a resistor complementary to the laser diode selectively connectable to the switch, and a passive circuit component coupled to the laser diode. The passive circuit component is a delay line, inductor, choke, coiled wire, or ferrite bead is contemplated. It may also typify a length of copper tracing on a printed circuit board that supports the laser diode. The circuit causes an initial overshoot voltage spike in an on voltage pulse that is about 20% or more than the settled on voltage. The voltage spike dampens out in about one-fourth of a total voltage on time of the pulse.