LIGHT BEAM DETECTION CIRCUIT, LIGHT BEAM SCAN UNIT AND IMAGE FORMING APPARATUS

摘要

In order to detect a passage timing of a light beam and to suppress cost, a light beam detection circuit (2) includes a detection signal generation section (34) configured to receive a light beam for scanning of a scanning target (101A) with one optical sensor (10), and generate a detection signal corresponding to an amount of received light; a reference signal output section (44) configured to output a reference signal that is in proportion to a light-amount control signal of a light-emission element (LD1) that emits the light beam; and a synchronizing signal generation section (35) configured to compare a detection signal generated by the detection signal generation section (34) with a reference signal output from the reference signal output section (44) to generate a synchronizing signal to determine a position to start scanning of the scanning target (101A) with the light beam.

主权项

1. A light beam detection circuit, comprising:
a detection signal generation section configured to receive a light beam for scanning of a scanning target with one optical sensor, and generate a detection signal corresponding to an amount of received light; a reference signal output section configured to output a reference signal that is in proportion to a light-amount control signal of a light-emitting element that emits the light beam; and a synchronizing signal generation section configured to compare the detection signal generated by the detection signal generation section with the reference signal output from the reference signal output section to generate a synchronizing signal to determine a position to start scanning of the scanning target with the light beam.