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US 2003/0072066 A1Published application
Optical scanning device for reducing a dot position displacement at a joint of scanning lines
AssigneeRicoh Company, Ltd.
InventorsYoshinori Hayashi, Tomohiro Nakajima, Mitsumi Fujii, Yukito Satoh, Eiji Mochizuki
Life of this patent
Estimating the term…
Abstract
In this optical scanning device, a plurality of scanning optical systems are arranged in a main scanning direction. Each of the scanning optical systems includes a deflecting unit performing an optical scanning by oscillation. Scanning frequencies of the deflecting units are substantially equal to one another. Each of the deflecting units is provided with means for varying the scanning frequency. The scanning frequency of each of the deflecting units is set midway between a maximum value and a minimum value of a resonance frequency intrinsic to the deflecting unit.
Claims25
An optical scanning device comprising:
- a plurality of scanning optical systems including a plurality of respective deflecting units each performing an optical scanning by oscillation;
- wherein said deflecting units have substantially equal scanning frequencies.
An optical scanning device comprising:
- a plurality of scanning optical systems including a plurality of respective deflecting units each performing an optical scanning by oscillation;
- wherein a timing for performing an image recording is changed with respect to at least one of said scanning optical systems every predetermined number of scanning periods.
An optical scanning device comprising:
- a light source emitting a light;
- an optical scanner including a frame substrate, a stationary member, and a mirror supported by a mirror substrate via an elastic member so as to deflect said light emitted from said light source by oscillating said mirror back and forth on a twisting axis formed by said elastic member;
- and
- resonance-frequency adjusting means for adjusting an intrinsic resonance frequency determined by said mirror and said elastic member forming said twisting axis.
1 more element
An optical scanning device comprising:
- a light source emitting a light;
- an optical scanner including a first substrate and a second substrate both composed of silicon, an insulating layer provided between said first substrate and said second substrate, and a mirror supported by said first substrate via an elastic member so as to deflect said light emitted from said light source by oscillating said mirror back and forth on a twisting axis formed by said elastic member;
- a moving electrode provided on a side surface of said mirror;
- a stationary electrode provided on said first substrate opposing said moving electrode;
- a separation groove provided in said first substrate so as to electrically separate said stationary electrode and said moving electrode;
- resonance-frequency adjusting means for adjusting an intrinsic resonance frequency determined by said mirror and said elastic member forming said twisting axis;
- frequency varying means for varying a frequency of a voltage impressed to said moving electrode and said stationary electrode, according to said resonance frequency adjusted by said resonance-frequency adjusting means;
- and
- voltage adjusting means for adjusting said voltage impressed to said moving electrode and said stationary electrode.
6 more elements
An optical scanning device comprising:
- a plurality of scanning optical systems including respective light sources emitting respective light beams controlled according to image data, and respective deflecting units deflecting the emitted respective light beams;
- and
- an image bearer on which the deflected light beams are projected so that images are formed by the projected light beams scanning on said image bearer,
- wherein each of said deflecting units is capable of moving alternately back and forth,
- said scanning optical systems are arranged serially in a main scanning direction of said image bearer, and
- each of said projected light beams scans on said image bearer unidirectionally in one main scanning direction.
3 more elements
An optical scanning device comprising:
- more than two scanning optical systems including respective light sources emitting respective light beams controlled according to image data, and respective deflecting units deflecting the emitted respective light beams;
- and
- an image bearer on which the deflected light beams are projected so that images are formed by the projected light beams scanning on said image bearer,
- wherein said scanning optical systems are arranged serially in a main scanning direction of said image bearer,
- at least one pair of the adjacent scanning optical systems among said scanning optical systems cause said projected light beams to scan on said image bearer in opposite main scanning directions parting from a joint of the respective images formed on said image bearer, and
- no pair of the adjacent scanning optical systems among said scanning optical systems cause said projected light beams to scan on said image bearer in opposite main scanning directions both toward the joint of the respective images formed on said image bearer.
3 more elements
An optical scanning device comprising:
- a plurality of scanning optical systems including respective light sources emitting respective light beams controlled according to image data, and respective deflecting units deflecting the emitted respective light beams;
- and
- an image bearer on which the deflected light beams are projected so that images are formed by the projected light beams scanning on said image bearer,
- wherein said scanning optical systems are arranged serially in a main scanning direction of said image bearer,
- at least one pair of the adjacent scanning optical systems among said scanning optical systems cause said projected light beams to scan on said image bearer in opposite main scanning directions parting from a joint of the respective images formed on said image bearer, and
- main scanning lines drawn by said adjacent scanning optical systems have inclinations different from each other.
3 more elements
An image forming apparatus comprising:
- an optical scanning device including a plurality of scanning optical systems having a plurality of respective deflecting units each performing an optical scanning by oscillation, the deflecting units having substantially equal scanning frequencies,
- wherein said scanning optical systems are arranged in a main scanning direction so that respective scanning areas of said scanning optical systems are combined so as to form an image.
An image forming apparatus comprising:
- an optical scanning device including a plurality of scanning optical systems having a plurality of respective deflecting units each performing an optical scanning by oscillation, a timing for performing an image recording being changed with respect to at least one of said scanning optical systems every predetermined number of scanning periods,
- wherein said scanning optical systems are arranged in a main scanning direction so that respective scanning areas of said scanning optical systems are combined so as to form an image.
An image forming apparatus comprising:
- an optical scanning device comprising a light source emitting a light, an optical scanner including a frame substrate, a stationary member, and a mirror supported by a mirror substrate via an elastic member so as to deflect said light emitted from said light source by oscillating said mirror back and forth on a twisting axis formed by said elastic member, and resonance-frequency adjusting means for adjusting an intrinsic resonance frequency determined by said mirror and said elastic member forming said twisting axis;
- a photosensitive member on which an electrostatic latent image is formed by said optical scanning device;
- a developing unit developing said electrostatic latent image with a toner into a toner image;
- and
- a transferring unit transferring said toner image to a sheet.
2 more elements
An image forming apparatus comprising:
- an optical scanning device comprising a light source emitting a light, an optical scanner including a first substrate and a second substrate both composed of silicon, an insulating layer provided between said first substrate and said second substrate, and a mirror supported by said first substrate via an elastic member so as to deflect said light emitted from said light source by oscillating said mirror back and forth on a twisting axis formed by said elastic member, a moving electrode provided on a side surface of said mirror, a stationary electrode provided on said first substrate opposing said moving electrode, a separation groove provided in said first substrate so as to electrically separate said stationary electrode and said moving electrode, resonance-frequency adjusting means for adjusting an intrinsic resonance frequency determined by said mirror and said elastic member forming said twisting axis, frequency varying means for varying a frequency of a voltage impressed to said moving electrode and said stationary electrode, according to said resonance frequency adjusted by said resonance-frequency adjusting means, and voltage adjusting means for adjusting said voltage impressed to said moving electrode and said stationary electrode;
- a photosensitive member on which an electrostatic latent image is formed by said optical scanning device;
- a developing unit developing said electrostatic latent image with a toner into a toner image;
- and
- a transferring unit transferring said toner image to a sheet.
2 more elements
An image forming apparatus comprising:
- an optical scanning device comprising a plurality of scanning optical systems including respective light sources emitting respective light beams controlled according to image data, and respective deflecting units deflecting the emitted-respective light beams, and an image bearer on which the deflected light beams are projected so that images are formed by the projected light beams scanning on said image bearer, wherein each of said deflecting units is capable of moving alternately back and forth, said scanning optical systems are arranged serially in a main scanning direction of said image bearer, and each of said projected light beams scans on said image bearer unidirectionally in one main scanning direction.
An image forming apparatus comprising:
- an optical scanning device comprising more than two scanning optical systems including respective light sources emitting respective light beams controlled according to image data, and respective deflecting units deflecting the emitted respective light beams, and an image bearer on which the deflected light beams are projected so that images are formed by the projected light beams scanning on said image bearer, wherein said scanning optical systems are arranged serially in a main scanning direction of said image bearer, at least one pair of the adjacent scanning optical systems among said scanning optical systems cause said projected light beams to scan on said image bearer in opposite main scanning directions parting from a joint of the respective images formed on said image bearer, and no pair of the adjacent scanning optical systems among said scanning optical systems cause said projected light beams to scan on said image bearer in opposite main scanning directions both toward the joint of the respective images formed on said image bearer.
An image forming apparatus comprising:
- an optical scanning device comprising a plurality of scanning optical systems including respective light sources emitting respective light beams controlled according to image data, and respective deflecting units deflecting the emitted respective light beams, and an image bearer on which the deflected light beams are projected so that images are formed by the projected light beams scanning on said image bearer, wherein said scanning optical systems are arranged serially in a main scanning direction of said image bearer, at least one pair of the adjacent scanning optical systems among said scanning optical systems cause said projected light beams to scan on said image bearer in opposite main scanning directions parting from a joint of the respective images formed on said image bearer, and main scanning lines drawn by said adjacent scanning optical systems have inclinations different from each other.
Dependencies are inferred from the claim text.