Patent ID: 7480230
Filing Date: 2009-01-20
Classification: G11B,H01S

Abstract:
1. A light source drive which modulates a light source so as to cause the same to emit a light, comprising: a superposition current generation part which generates a superposition current approximately corresponding to a charging/discharging current needed for a capacitance occurring in parallel to said light source for a predetermined time period near at least one of a rising-up part and a decaying-down part of a waveform of a drive current of said light source; an addition/subtraction part which adds to or subtracts from the drive current the superposition current generated by said superposition current generation part; and an output impedance control part which changes an output impedance value of a drive current output part which provides the drive current to said light source, for a predetermined time period near at least one of a rising-up part and a decaying-down part of a waveform of the drive current.