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US 7,460,144 B2Granted
Optical scanning device and image forming apparatus
AssigneeBrother Kogyo Kabushiki Kaisha
InventorTasuku Sugimoto
Life of this patent
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Abstract
An optical scanning device that includes: a light-emitting unit that emits laser light to a polygon mirror on the basis of a turning-on signal; a sensor unit that detects laser light reflected by the polygon mirror and outputs a sensor signal; and a noise removing unit that outputs a laser light detection signal when the sensor signal is output during an output period of the turning-on signal.
Claims18
An optical scanning device comprising:
- a light-emitting unit that emits laser light to a polygon mirror on the basis of a turning-on signal;
- a sensor unit that detects laser light reflected by the polygon mirror and outputs a sensor signal;
- and
- a noise removing unit that outputs a laser light detection signal when the sensor signal is output during an output period of the turning-on signal, wherein an initial turning-on signal, which detects an initial sensor signal after a polygon motor for driving the polygon mirror starts to rotate, has an output period longer than those of subsequent turning-on signals.
1 more element
An optical scanning device comprising:
- a light-emitting unit that emits laser light to a polygon mirror on a basis of a turning-on signal;
- a sensor unit that detects laser light reflected by the polygon mirror and outputs a sensor signal;
- a noise removing unit that outputs a laser light detection signal when the sensor signal is output during an output period of the turning-on signal;
- a first circuit that outputs the first turning-on signal;
- and
- a second circuit that outputs the second turning-on signal, the second circuit being provided separately from the first circuit,
- wherein the turning-on signal comprises a first turning-on signal for laser light detection by the sensor unit, and a second turning-on signal generated on the basis of data for image formation, and
- wherein when the sensor signal is output within an output period of the first turning-on signal, the noise removing unit outputs the laser light detection signal, and the first circuit receives the sensor signal from the sensor unit and outputs the first turning-on signal according to the input of the sensor signal at regular intervals,
- and wherein the first circuit stops the output of the first turning-on signal on the basis of the input of the sensor signal from the sensor unit, and, with a timing of stopping the output of the first turning-on signal as a reference timing, restarts the output of the first turning-on signal after time T, which is shorter than time required until one surface of the polygon mirror crosses an irradiation position by the light-emitting unit, lapses from the reference timing.
6 more elements
An image forming apparatus comprising:
- an optical scanning device that comprises:
- a light-emitting unit that emits laser light to a polygon mirror on the basis of a turning-on signal;
- a sensor unit that detects laser light reflected by the polygon mirror and outputs a sensor signal;
- and
- a noise removing unit that outputs a laser light detection signal when the sensor signal is output during an output period of the turning-on signal, wherein an initial turning-on signal, which detects an initial sensor signal after a polygon motor for driving the polygon mirror starts to rotate, has an output period longer than those of subsequent turning-on signals.
2 more elements
An image forming apparatus comprising:
- an optical scanning device, the optical scanning device comprising:
- a light-emitting unit that emits laser light to a polygon mirror on a basis of a turning-on signal;
- a sensor unit that detects laser light reflected by the polygon mirror and outputs a sensor signal;
- a noise removing unit that outputs a laser light detection signal when the sensor signal is output during an output period of the turning-on signal;
- a first circuit that outputs the first turning-on signal;
- and
- a second circuit that outputs the second turning-on signal, the second circuit being provided separately from the first circuit,
- wherein the turning-on signal comprises a first turning-on signal for laser light detection by the sensor unit, and a second turning-on signal generated on the basis of data for image formation, and
- wherein when the sensor signal is output within an output period of the first turning-on signal, the noise removing unit outputs the laser light detection signal, and the first circuit receives the sensor signal from the sensor unit and outputs the first turning-on signal according to the input of the sensor signal at regular intervals,
- and wherein the first circuit stops the output of the first turning-on signal on the basis of the input of the sensor signal from the sensor unit, and, with a timing of stopping the output of the first turning-on signal as a reference timing, restarts the output of the first turning-on signal after time T, which is shorter than time required until one surface of the polygon mirror crosses an irradiation position by the light-emitting unit, lapses from the reference timing.
7 more elements
Dependencies are inferred from the claim text.