Patent ID: 6643303
Filing Date: 2003-11-04
Classification: G11B,H01S

Abstract:
A laser driving apparatus comprising:n laser light sources L1 to Ln in which n is a natural number equal to or larger than 2; a photodetector detecting rays emitted from said n laser light sources; n variable resistors VR1 to VRn connected to said photodetector; a voltage detector detecting n different values of voltages V1 to Vn related to said n variable resistors; a controller controlling outputs of said laser light sources so that the detected voltage values are maintained at predetermined values, and said n variable resistors VR1 to VRn are connected in series to one another, wherein each of the n different values of voltages V1 to Vn detected is a voltage across both ends of one variable resistor within said n variable resistors, or a voltage across both ends of a serial circuit including at least two resistors within said n variable resistors.