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AssigneeSharp Kabushiki Kaisha
InventorsHideo Taniguchi, Akihiko Taniguchi, Tamaki Mashiba, Masanori Mori
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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.
A light emitting element control device, comprising:
An optical sensor control device designed for an optical sensor including a light emitting element and a light receiving element for outputting a sensor voltage that varies according to an amount of light received wherein an output signal for controlling an amount of light emitted from the light emitting element is output from control means having a D/A converter stored therein, said optical sensor control device comprising:
A blank lamp control means comprising:
Dependencies are inferred from the claim text.