BEAM OUTPUT CONTROL APPARATUS

PROBLEM TO BE SOLVED: To certainly control the light quantity of a plurality of beams through simple structure. SOLUTION: A selection part 62 of beams to be corrected generates a selection signal Pcng0 of the beams to be corrected showing the order of the output quantity correction process of each of the beams. A switching signal generation part 65 of APC lighting beam generates the switching signal Pcng0 of APC lighting beam having a clock corresponding to the beam. A reference signal generation part 68 counts the switching signal of APC lighting beam, switches a switching device 85 on the basis of a select signal SEL from an APC timing control part 67 and outputs reference signals of corresponding colors in time division. A counting processing part 66 and the APC timing control part 67 cooperate to generate a beam-corresponding clock in which a correction timing is so adjusted that the correction process of a following beam is stopped for a predetermined term immediately after switching a reference value and the correction process of the stopped beam is begun after the predetermined term elapses, and further output the switching signal Pcng of APC lighting beam to an output value control part 52. COPYRIGHT: (C)2007,JPO&INPIT