Canon Kabushiki Kaisha

Hiroyuki Fukuhara

Yoshihiko Tanaka

Takashi Kawana

Yuuji Takayama

Hikaru Uchidate

Shuichi Kurokawa

Kazuyuki Ishihara

Jun Nagatoshi

Mitsuhiro Obara

Naoki Matsushita

Tetsuya Nishiguchi

Chihiro Shirakawa

Akira Nakamura

Hidenori Kanazawa

Shuhei Watanabe

Yoji Misao

Junya Kobayashi

Taku Murotani

Isshin Sato

An optical scanning apparatus includes a light source, a polygon mirror including a plurality of reflecting surfaces configured to reflect light emitted from the light source, the polygon mirror being configured to be rotated around a rotary shaft, and a casing configured to accommodate the light source and the polygon mirror. The casing defines a first space that accommodates the polygon mirror and a second space that is different from the first space, the casing including a partition wall disposed between the first space and the second space. The second space is disposed further from the rotary shaft than the partition wall in a radial direction orthogonal to an axial direction of the rotary shaft, and is disposed such that the second space overlaps with the first space in the axial direction.

Optical scanning apparatus and image forming apparatus

An image-forming apparatus includes a light-irradiation unit configured to move a spot of laser light on a surface of a photosensitive member at a non-constant scanning velocity in a main scanning direction to form a latent image on the photosensitive member, an image data correcting unit configured to correct a length in the main scanning direction of image data by inserting one or more image data pieces into the image data, the number of the image data pieces increasing as the scanning velocity increases, and/or extracting one or more image data pieces from the image data, the number of the image data pieces increasing as the scanning velocity decreases, and a brightness correcting unit configured to correct a brightness of the laser light so that an emission brightness increases as the scanning velocity increases and/or the emission brightness decreases as the scanning velocity decreases.

Image-forming apparatus

An image forming apparatus includes a detection unit configured to detect a first scan beam from a first light source; and a control unit. The control unit performs corrections in which a light emission period of scan beams per pixel is changed in accordance with which section is scanned by the scan beams, and performs corrections in which a light exposure amount by which the photosensitive member is exposed to light by the scan beams is changed in accordance with which section in the main scanning direction is scanned by the scan beams. Based on a detection timing at which the detection unit has detected the first scan beam, the control unit controls scan start timings at which the scan beams start scanning of the photosensitive member.

Image forming apparatus that scans photosensitive member using plurality of scan beams

An image forming apparatus is provided which forms an image on a recording medium. The image forming apparatus includes a housing; a plurality of photosensitive members which bear respective toner images; a scanning unit which scans surfaces of the plurality of photosensitive members by laser light in accordance with image information; and a recording medium container which contains the recording medium and is detachably mounted in the housing. The scanning unit is disposed under the plurality of photosensitive members and over the recording medium container in the vertical direction, and other components are not interposed between the scanning unit and the recording medium container in the vertical direction.

Image forming apparatus with reduced height

An optical scanning apparatus includes a deflector to deflect laser light emitted from a light source for scanning, and a detection unit attached to a substrate provided with a through-hole for the detection unit to receive laser light that has passed through the through-hole. The substrate is attached to an optical box that is to store the deflector. The detection unit detects the laser light to control an irradiation position on a scanned surface of the laser light reflected by the deflector. The optical box is provided with a passing portion to guide the laser light emitted from the light source to the detection unit, and protruded portions disposed around the passing portion and protruded toward the substrate side. The substrate is attached to the optical box in a state where the protruded portions are engaged with walls forming the through-hole.

An optical scanning apparatus, including: a detector configured to detect a writing start position of a light beam emitted from a light source and reflected by a rotary polygon mirror; and a control circuit board electrically connected to the light source, wherein the detector is fixed to the control circuit board, the control circuit board includes a first connection portion at which the light source is connected to the control circuit board and a second connection portion through which the control circuit board and an exterior are electrically connected, the control circuit board is fixed to an optical box by a fixing unit, and the fixing unit is arranged, between the first connection portion and the second connection portion, on a second straight line orthogonal to a first straight line connecting the light source and the detector, so as to be closer to the detector than to the light source.

An optical scanning apparatus according to the present invention includes a light source, and a substrate including an electric circuit for causing the light source to emit light. The number of holes in the substrate into which terminals in the light source are respectively inserted is larger than the number of the terminals, so that the substrate can also be used for another light source including a different number of terminals.

Optical scanning apparatus and optical scanning apparatus system

An image forming apparatus includes a scanner unit configured to emit light depending on image information, the scanner unit including an optical element and an optical box provided with an opening and configured to accommodate the optical element; and an outer cover of the image forming apparatus. The optical box has an open portion uncovering the optical element. The open portion of the optical box faces the outer cover.

Image forming apparatus

An image forming apparatus includes: a rotating polygonal mirror having reflection surfaces, and to reflect a luminous flux at each reflection surface so as to scan a photosensitive member; a detection unit configured to detect the luminous flux; a measurement unit configured to measure an interval between time points at which the detection unit detects the luminous flux; a storage unit configured to store correction value data for correcting an image signal for each reflection surface relative to a reference reflection surface; and a specification unit configured to select a characteristic value from among a plurality of values that are obtained from results of measurements, and to specify the reference reflection surface based on the characteristic value. The plurality of values include results of predetermined operations performed on two or more intervals measured by the measurement unit.

Image forming apparatus that scans photosensitive member by using rotating polygonal mirror

Image-forming apparatus for correcting a brightness of a laser light

The present invention relates to an optical scanning device and an image forming apparatus. In order to suppress jitter, the degree of convergence of a first incident optical system and the degree of convergence of a second incident optical system are both equal to or greater than 0, and the degree of convergence of the second incident optical system is greater than the degree of convergence of the first incident optical system. An angle of incidence, within a sub-scanning section, of a light beam incident on a deflection surface of an optical deflector from the second incident optical system is less than an angle of incidence, within the sub-scanning section, of a light beam incident on the deflection surface of the optical deflector from the first incident optical system.

Optical scanning device and image forming apparatus

The present invention roughens at least a partial region of an outer planar surface of at least one of an optical case and a lid of a laser scanner; thus, electrification of the optical case to be caused by friction with another member or a person is reduced, and damage to an electronic component is prevented.

Optical scanning device

An image forming apparatus includes: a scanning unit configured to form a latent image on a photosensitive member, wherein a scanning speed changes within a scan line; a control unit configured to perform correction control of a luminance and a light-emitting time of a light source; a holding unit configured to hold profile information indicating a change of the light spot due to an environment or due to a position of the pixel. The holding unit is further configured to hold scanning information indicating the light-emitting time of the light source or the luminance of the light source with respect to a pixel, for correcting a change in the scanning time of the pixel, and the control unit is further configured to perform the correction control based on the scanning information and the profile information.

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Suntou-gun, Japan

Hiroyuki Fukuhara