Electrophotography – Supplemental electrophotographic process – Exposure or charging
Patent
1997-03-21
1999-03-16
Royer, William
Electrophotography
Supplemental electrophotographic process
Exposure or charging
399186, 399187, G03G 2100
Patent
active
058841253
ABSTRACT:
A control circuit for outputting a signal for controlling an amount of light emitted from a plurality of light emitting elements. The control circuit includes a controller or CPU, and a D/A converter outputting a signal for setting a voltage in multiple gradation in accordance with a lighting state of the light emitting element. An amplifying circuit amplifies an output of the D/A converter and outputs an amplified output as a control signal. A reference voltage generating circuit generates a reference voltage and a comparator compares the control signal with the reference voltage. The controller varies an output of the D/A converter based on the result of comparison by the comparator, to adjust the output of the D/A converter so that the control signal is equivalent to the reference voltage. Accordingly each voltage is reset in the multiple gradation to allow the light emitting element to appropriately emit light based on the adjusted output. As a result, a plurality of light emitting elements can be controlled stably without using a high precision circuit element.
Mashiba Tamaki
Mori Masanori
Taniguchi Akihiko
Taniguchi Hideo
Conlin David G.
Royer William
Sharp Kabushiki Kaisha
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