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1. 发明授权

US11592759B2 Image forming apparatus 有权
公开(公告)号：US11592759B2
公开(公告)日：2023-02-28
申请号：US17399296
申请日：2021-08-11
申请人： CANON KABUSHIKI KAISHA
发明人： Hidefumi Yoshida
IPC分类号： G03G15/043
摘要： An image forming apparatus includes a photosensitive drum which is rotatable; light-emitting portions arranged along a direction of a rotational axis of the photosensitive drum, the light-emitting portions emitting light based on image data in order to expose the photosensitive drum; a reference clock signal generation portion which generates a reference clock signal with a predetermined period; a modulated clock signal generation portion which generates a modulated clock signal with a predetermined modulation period by spreading a spectrum of the reference clock signal and by modulating the predetermined period, wherein the light-emitting portions emit light for a lighting time set based on the modulated clock signal; and a control signal generation portion which generates with a period of n times the predetermined modulation period (n is an integer greater than or equal to 1) a control signal for controlling a timing at which the light-emitting portions emit light.

2. 发明申请

US20220146959A1 LIGHT EMITTING DEVICE AND IMAGE FORMING APPARATUS INCLUDING LIGHT EMITTING DEVICE 有权
公开(公告)号：US20220146959A1
公开(公告)日：2022-05-12
申请号：US17584516
申请日：2022-01-26
申请人： CANON KABUSHIKI KAISHA
发明人： Yasutomo Furuta , Takahisa Ono , Hayato Koyama , Hidefumi Yoshida
IPC分类号： G03G15/04 , G03G15/041
摘要： A light emitting device 401 includes a silicon substrate and a light emitting region including a lower electrode, a light emitting layer, and an upper electrode, and an exposure head is provided with a printed board on which light emitting devices 401 are arranged in a staggered form and a circuit portion 602 for controlling, on the basis of image data, a voltage of each of electrodes included in the lower electrode so that the light emitting device layer emits light and is for forming an image with a resolution corresponding to an arrangement interval of the lower electrode with respect to a crossing direction, and the circuit portion 602 is disposed together with the light emitting region on the silicon substrate. Costs on wire bonding and an area of a wiring board can be suppressed.

3. 发明授权

US11635703B2 Light emitting device and image forming apparatus including light emitting device 有权
公开(公告)号：US11635703B2
公开(公告)日：2023-04-25
申请号：US17584516
申请日：2022-01-26
申请人： CANON KABUSHIKI KAISHA
发明人： Yasutomo Furuta , Takahisa Ono , Hayato Koyama , Hidefumi Yoshida
IPC分类号： B41J2/45 , B41J2/447 , H01L51/50 , G03G15/04 , G03G15/041
摘要： A light emitting device 401 includes a silicon substrate and a light emitting region including a lower electrode, a light emitting layer, and an upper electrode, and an exposure head is provided with a printed board on which light emitting devices 401 are arranged in a staggered form and a circuit portion 602 for controlling, on the basis of image data, a voltage of each of electrodes included in the lower electrode so that the light emitting device layer emits light and is for forming an image with a resolution corresponding to an arrangement interval of the lower electrode with respect to a crossing direction, and the circuit portion 602 is disposed together with the light emitting region on the silicon substrate. Costs on wire bonding and an area of a wiring board can be suppressed.

4. 发明授权

US10921727B2 Exposure head, image forming apparatus, and circuit board 有权
公开(公告)号：US10921727B2
公开(公告)日：2021-02-16
申请号：US16427988
申请日：2019-05-31
申请人： CANON KABUSHIKI KAISHA
发明人： Hidefumi Yoshida
IPC分类号： G03G15/043
摘要： An exposure head configured to expose a photosensitive drum to light includes a circuit board on which a plating layer is formed, a semiconductor chip, which is provided on the plating layer, and includes a light emitting element configured to emit the light for exposing the photosensitive drum, a lens array configured to condense the light emitted from the light emitting element onto the photosensitive drum, and a housing to which the lens array and the circuit board are fixed, wherein the plating layer and a part of the housing abut against each other in an optical axis direction of the lens array, and wherein the light emitting element and the lens array are opposed to each other in the optical axis direction.

5. 发明申请

US20200004173A1 IMAGE FORMING APPARATUS 审中-公开
公开(公告)号：US20200004173A1
公开(公告)日：2020-01-02
申请号：US16448223
申请日：2019-06-21
申请人： CANON KABUSHIKI KAISHA
发明人： Hidefumi Yoshida
IPC分类号： G03G15/043
摘要： An image forming apparatus including: an exposure portion including a plurality of surface emitting elements configured to expose a photosensitive member; a drive unit configured to turn ON the surface emitting elements based on image information; and a light amount control unit configured to adjust a drive current value to control an amount of light to be emitted from the surface emitting elements; and a controller configured to output the image information to the exposure portion, the controller including: a light amount adjustment unit configured to correct the image information based on an adjustment value to adjust the amount of light to be emitted from the surface emitting elements; and a medium tone processing unit configured to quantize the image information corrected by the light amount adjustment unit by error diffusion to reduce a number of tones in the image information.

6. 发明授权

US11409208B2 Image exposure head and image forming apparatus 有权
公开(公告)号：US11409208B2
公开(公告)日：2022-08-09
申请号：US16999211
申请日：2020-08-21
申请人： CANON KABUSHIKI KAISHA
发明人： Hidefumi Yoshida , Hayato Koyama
IPC分类号： G03G15/04 , G03G15/043
摘要： An exposure head for forming an image of a first resolution corresponding to an arrangement interval of a plurality of lower electrodes in a crossing direction or an image of a second resolution lower than the first resolution. A circuit portion includes an image data storage portion that is arranged on the substrate together with a plurality of lower electrodes and converts input image data into image data according to the resolution. By this, the same exposure head can be used for both high resolution images and low resolution images without degrading the image quality.

7. 发明授权

US09817331B2 Image forming apparatus 有权
公开(公告)号：US09817331B2
公开(公告)日：2017-11-14
申请号：US15176566
申请日：2016-06-08
申请人： CANON KABUSHIKI KAISHA
发明人： Hidefumi Yoshida
IPC分类号： G03G15/00 , G03G15/043 , G06K15/02 , G03G15/04
CPC分类号： G03G15/043 , G03G15/04018 , G06K15/1801 , G06K15/1878
摘要： An image forming apparatus including: a light irradiating unit configured to irradiate a photosensitive member charged by a charging unit with light to form an electrostatic latent image; a processing unit configured to generate M-bit (M is an integer not less than 2) density data indicating a density based on the input image data, to generate (M+N)-bit processing data based on the M-bit density data and N-bit (N is an integer not less than 1) correction data, to convert the processing data into a plural-bit binary drive data corresponding to a value of the processing data, and to serially output the plural-bit drive data bit by bit to generate a drive signal; and a drive unit configured to drive the light irradiating unit based on the drive signal.

8. 发明申请

US20230050444A1 IMAGE FORMING APPARATUS 有权
公开(公告)号：US20230050444A1
公开(公告)日：2023-02-16
申请号：US17848480
申请日：2022-06-24
申请人： CANON KABUSHIKI KAISHA
发明人： Hidefumi Yoshida
IPC分类号： G06K15/12 , G03G15/043 , G03G15/04
摘要： Provided are: an exposure device being configured to perform multiple exposure with the second light-emitting element array to a place exposed with the first light-emitting element array; and a controller configured to transmit a signal for controlling the exposure device, in which the exposure device sets a first pulse signal for light emission of the first light-emitting element array, based on a first delay time and a first pulse width, sets a second pulse signal for light emission of the second light-emitting element array, based on a second delay time, different from the first delay time, and a second pulse width, identical to the first pulse width, and starts and terminates light emission of each of the first light-emitting element array and the second light-emitting element array, according to the set first pulse signal and second pulse signal.

9. 发明申请

US20210055669A1 IMAGE EXPOSURE HEAD AND IMAGE FORMING APPARATUS 有权
公开(公告)号：US20210055669A1
公开(公告)日：2021-02-25
申请号：US16999211
申请日：2020-08-21
申请人： CANON KABUSHIKI KAISHA
发明人： Hidefumi Yoshida , Hayato Koyama
IPC分类号： G03G15/043 , G03G15/04
摘要： An exposure head for forming an image of a first resolution corresponding to an arrangement interval of a plurality of lower electrodes in a crossing direction or an image of a second resolution lower than the first resolution. A circuit portion 602 includes an image data storage portion 804 which is arranged on the substrate together with a plurality of lower electrodes and converts input image data into image data according to the resolution. By this, the same exposure head can be used for both high resolution images and low resolution images without degrading the image quality.

10. 发明申请

US20220066351A1 IMAGE FORMING APPARATUS 有权
公开(公告)号：US20220066351A1
公开(公告)日：2022-03-03
申请号：US17399296
申请日：2021-08-11
申请人： CANON KABUSHIKI KAISHA
发明人： Hidefumi Yoshida
IPC分类号： G03G15/043
摘要： Disclosed is an image forming apparatus including a photosensitive drum which is rotatable; light-emitting portions arranged along a direction of a rotational axis of the photosensitive drum, the light-emitting portions emitting light based on image data in order to expose the photosensitive drum; a reference clock signal generation portion which generates a reference clock signal with a predetermined period; a modulated clock signal generation portion which generates a modulated clock signal with a predetermined modulation period by spreading a spectrum of the reference clock signal and by modulating the predetermined period, wherein the light-emitting portions emit light for a lighting time set based on the modulated clock signal; and a control signal generation portion which generates with a period of n times the predetermined modulation period (n is an integer greater than or equal to 1) a control signal for controlling a timing at which the light-emitting portions emit light.

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