Light source driver, light source-driving method, image-forming apparatus, light source-driving circuit, and optical scanner
AssigneeRicoh Company, Ltd.
InventorsAtsufumi OMORI, Masaaki Ishida, Muneaki Iwata, Hayato Fujita
Life of this patent
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Abstract
A light source driver includes a controller which outputs an undershoot current in synchronization with lighting complete timing in lighting information, wherein the controller is configured to output the undershoot current such that a voltage in a light source when the output of the undershoot current is complete is equal to a voltage in the light source before being turned on.
Claims20
A light source driver, comprising:
- a controller which outputs an undershoot current in synchronization with lighting complete timing in lighting information, wherein
- the controller is configured to output the undershoot current such that a voltage in a light source when the output of the undershoot current is complete is equal to a voltage in the light source before being turned on.
A method of driving a light source, comprising:
- a step of outputting an operation current from lighting start timing to lighting complete timing in lighting information;
- and
- a step of outputting an undershoot current in synchronization with the lighting complete timing such that a voltage in the light source when the output of the undershoot current is complete equals to a voltage in the light source before being turned on.
A light source-driving circuit which drives a light source, comprising:
- a driving current generator which generates a predetermined current for obtaining a predetermined light volume from the light source, and a driving current including a first undershoot current and a second undershoot current to be subtracted from the predetermined current;
- and
- a controller which sets the first undershoot current to a fixed value, and sets the second undershoot current to a value adjusted according to the light volume of the light source.
An optical scanner, comprising:
- a light source;
- a reflection mirror which reflects light irradiated from the light source;
- and
- a light source-driving circuit which drives the light source, wherein
- the light source-driving circuit includes a driving current generator which generates a predetermined current for obtaining a predetermined light volume from the light source and a driving current including a first undershoot current and a second undershoot current subtracted from the predetermined current, and a controller which sets the first undershoot current to a fixed value, and sets the second undershoot current to a value adjusted according to the light volume of the light source.
An image-forming apparatus, comprising:
- a light source;
- a reflection mirror which reflects light irradiated from the light source;
- a photoreceptor which is scanned by light reflected by the reflection mirror;
- and
- a light source-driving circuit which drives the light source, wherein
- the light source-driving circuit includes a driving current generator which generates a predetermined current for obtaining a predetermined light volume from the light source and a driving current including a first undershoot current and a second undershoot current subtracted from the predetermined current, and a controller which sets the first undershoot current to a fixed value, and sets the second undershoot current to a value adjusted according to the light volume of the light source.
Dependencies are inferred from the claim text.