Patent ID: 7760779
Filing Date: 2010-07-20
Classification: G11B

Abstract:
1. A laser drive circuit that generates a drive current for driving a laser diode according to inputted first and second variable currents and inputted first and second pulse control signals, the laser drive circuit comprising: a first drive circuit receiving an input of the first variable current and the first pulse control signal and outputting a first drive current in synchronism with the first pulse control signal; a pulse output circuit outputting a pulse signal in response to a falling edge of the first pulse control signal; and a second drive circuit receiving an input of the second variable current and the second pulse control signal, generating a second drive current in synchronism with the second pulse control signal, with decreased current value at least in synchronism with the pulse signal, wherein the laser diode is driven by a current obtained by adding the output current of the first drive circuit and the output current of the second drive circuit.