Patent ID: 6867555
Filing Date: 2005-03-15
Classification: H05B,Y10S

Abstract:
1. An intensity modulator, comprising: a light source driving circuit for periodically generating an output fluctuation point on a time axis; a light source which is driven by the light source driving circuit so as to output light; a light passage controller for controlling passage of the light; and a modulation controller for setting predetermined synchronizing periods and a plurality of unit periods with different time lengths in each of the synchronizing periods, controlling passage of the light using the light passage controller at each of the unit periods, and controlling intensity of the light so as to modulate pulse width at each of the synchronizing periods, wherein the modulation controller selects the unit period, where the intensity error which occurs with the output fluctuation point being inserted is predicted not to be visually recognized with human's eyesight characteristics, from the unit periods, and controls arrangement of the unit periods so that the output fluctuation point is inserted into the selected unit period.