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US 8,314,975 B2Granted
Optical scanning device and image forming apparatus
AssigneeRicoh Company, Ltd.
InventorTadashi Nakamura
Life of this patent
Estimating the term…
Abstract
A first main-scanning-position correction unit divides a surface to be scanned into first areas in a main scanning direction into areas, sets a separate clock-pulse timing for first area, and corrects a main-scanning position error. A second main-scanning-position correction unit divides the surface into second areas in the main scanning direction based on first-scanning-position correction data, sets a separate clock-pulse timing for each second area, and corrects the main-scanning position error.
Claims20
An optical scanning device comprising:
- a light source configured to emit a light flux;
- and
- a deflector configured to sinusoidally oscillate and thereby deflectively scan a surface to be scanned with the light flux emitted from the light source;
- and
- wherein the optical scanning device includes a first correction unit configured to divide the surface into a plurality of first areas in a main scanning direction and set a separate clock-pulse timing for each of the first areas, and correct a main-scanning position error, and generate first corrected data;
- wherein the scanning device includes a second correction unit configured to divide the surface into a plurality of second areas in the main scanning direction based on the first corrected data, set a separate clock-pulse timing for each of the second areas, and correct residual main-scanning error after being corrected by the first correction unit;
- and
- wherein the main-scanning position error is corrected by the second correction unit based on the first corrected data.
5 more elements
An image forming apparatus comprising:
- a process unit configured to execute an electrophotographic process;
- and
- an optical scanning device as a unit that executes an exposing process of the electrophotographic process;
- and
- wherein the optical scanning device includes:
- a light source configured to emit a light flux;
- a deflector configured to sinusoidally oscillate and thereby deflectively scan a surface to be scanned with the light flux emitted from the light source;
- a first correction unit configured to divide the surface into a plurality of first areas in a main scanning direction and set a separate clock-pulse timing for each of the first areas, and correct a main-scanning position error;
- and a second correction unit configured to divide the surface into a plurality of second areas in the main scanning direction based on first corrected data, set a separate clock-pulse timing for each of the second areas, and correct the main-scanning position error, wherein the main-scanning position error is corrected by the second correction unit based on the first corrected data.
6 more elements
An optical scanning device comprising:
- a light source configured to emit a light flux;
- a deflector configured to sinusoidally oscillate and thereby deflectively scan a surface to be scanned with the light flux emitted from the light source;
- a first correction unit configured to divide the surface into a plurality of first areas in a main scanning direction and set a separate clock-pulse timing for each of the first areas, and correct a main-scanning position error;
- and
- a second correction unit configured to divide the surface into a plurality of second areas in the main scanning direction based on first corrected data, set a separate clock-pulse timing for each of the second areas, and correct the main-scanning position error,
- wherein the main-scanning position error is corrected by the second correction unit based on the first corrected data, and wherein the first correction unit determines a clock frequency for each of the first areas and the second correction unit corrects the main-scanning position error based on the clock frequency determined by the first correction unit.
3 more elements
Dependencies are inferred from the claim text.