Pulse-modulation-signal generating device, light-source device, and optical scanning device
AssigneeRicoh Company, Ltd.
InventorDan Ozasa
Life of this patent
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Abstract
A high-frequency clock generating circuit generates a plurality of high-frequency clock signals having different phases. A modulation-signal generating circuit generates a pulse modulation signal based on transition timing data including data pertaining to a turn-on timing at which a state of a light source is changed from a turn-off state to a turn-on state and a turn-off timing at which the state of the light source is changed from the turn-on state to the turn-off state by inputting any one of the high-frequency clock signals for a predetermined period including the turn-on timing and the turn-off timing.
Claims13
A pulse-modulation-signal generating device that generates a pulse modulation signal for driving a light source to emit a pulsed light according to input image data, the pulse-modulation-signal generating device comprising:
- a high-frequency clock generating circuit that generates a plurality of high-frequency clock signals having different phases;
- and
- a modulation-signal generating circuit that generates the pulse modulation signal based on transition timing data including timing data pertaining to a turn-on timing at which a state of the light source is changed from a turn-off state to a turn-on state and a turn-off timing at which the state of the light source is changed from the turn-on state to the turn-off state by inputting any one of the high-frequency clock signals for a predetermined period including the turn-on timing and the turn-off timing.
A light-source device that emits a light modulated according to input image data, the light-source device comprising:
- a light source that emits a light;
- and
- a pulse-modulation-signal generating device that generates a pulse modulation signal for driving the light source to emit a pulsed light according to the input image data, the pulse-modulation-signal generating device including
- a high-frequency clock generating circuit that generates a plurality of high-frequency clock signals having different phases, and
- a modulation-signal generating circuit that generates the pulse modulation signal based on transition timing data including timing data pertaining to a turn-on timing at which a state of the light source is changed from a turn-off state to a turn-on state and a turn-off timing at which the state of the light source is changed from the turn-on state to the turn-off state by inputting any one of the high-frequency clock signals for a predetermined period including the turn-on timing and the turn-off timing.
An optical scanning device that scans a target surface with a light, the optical scanning device comprising:
- a light-source device that emits a light modulated according to input image data, the light-source device including
- a light source that emits a light, and
- a pulse-modulation-signal generating device that generates a pulse modulation signal for driving the light source to emit a pulsed light according to the input image data, the pulse-modulation-signal generating device including
- a high-frequency clock generating circuit that generates a plurality of high-frequency clock signals having different phases, and
- a modulation-signal generating circuit that generates the pulse modulation signal based on transition timing data including timing data pertaining to a turn-on timing at which a state of the light source is changed from a turn-off state to a turn-on state and a turn-off timing at which the state of the light source is changed from the turn-on state to the turn-off state by inputting any one of the high-frequency clock signals for a predetermined period including the turn-on timing and the turn-off timing;
- a deflector that deflects the light emitted from the light source;
- and
- a scanning optical system that focuses a deflected light deflected by the deflector on the target surface.
Dependencies are inferred from the claim text.