Patent ID: 7671882
Filing Date: 2010-03-02
Classification: H01S,H04N

Abstract:
1. A semiconductor laser modulation driving apparatus comprising: a semiconductor laser; an image generating unit that generates an image data signal including a plurality of parallel signals; a semiconductor laser modulation signal generating unit that receives the image data signal and generates a semiconductor laser modulation signal for modulating the semiconductor laser; a semiconductor laser driving unit that receives the semiconductor laser modulation signal and drives the semiconductor laser based on the semiconductor laser modulation signal; and an impedance correction unit that adjusts an output impedance of the semiconductor laser modulation signal generating unit to match an input impedance of the semiconductor laser driving unit, wherein the semiconductor laser modulation signal generating unit transmits the semiconductor laser modulation signal as a pair of small swing differential signals, to the semiconductor laser driving unit, the semiconductor laser modulation signal generation unit and the image generating unit are formed on a single board or an ASIC, the semiconductor laser driving unit is formed on a different board that is different from said single board or on a different ASIC that is different from said ASIC on which the semiconductor laser modulation signal generation unit and the image generating unit are formed, the semiconductor laser driving unit is arranged to be proximate to the semiconductor laser, and the semiconductor laser modulation signal generating unit has a first supply voltage, and the semiconductor laser driving unit has a second supply voltage higher than the first supply voltage.