LASER DIODE CONTROL CIRCUITRY

摘要

32770CAN6A Laser Diode Control Circuitry Circuitry for control of the level of light output from a laser diode (1) that is adapted to direct its light output to a resonant scanning mirror (3) including a biasing current circuit portion (10) for providing a current level for the laser diode (1) at a desired set point and a circuit portion (8) connected to the laser diode which reduces the current through the laser diode (1) by an amount that is inversely proportional to the velocity of the scanning mirror (3) so the amount of light energy received from the scanning mirror at any portion of a scan surface covered by the scanning mirror will be the same when the laser diode (1) is on. Another circuit portion (9) is also connected directly to the laser diode (1) to selectively reduce the current through the laser diode to a level that is below the laser diode threshold current in accordance with binary signals supplied to such circuit portion (9).