Patent ID: 7529172
Filing Date: 2009-05-05
Classification: G11B

Abstract:
1. An optical disk recording and playback device that uses an optical disk provided with two recording layers including a signal recording layer and an image recording layer formed, in that order, from a light incident surface on which laser light is incident, the optical disk recording and playback device comprising an optical pickup incorporating a first laser diode and a second laser diode, wherein the first laser diode emits laser light to be applied to the signal recording layer, and the second laser diode emits laser light to be applied to the image recording layer, the optical disk recording and playback device further comprising: a first laser driving circuit that supplies a driving signal to the first laser diode; a second laser driving circuit that supplies a driving signal to the second laser diode; a signal recording pulse generating circuit that generates a signal recording pulse signal in accordance with a signal to be recorded on the signal recording layer, and outputs the signal recording pulse signal to the first laser driving circuit; and an image recording pulse generating circuit that generates an image recording pulse signal in accordance with a signal to form an image on the image recording layer, and outputs the image recording pulse signal to the second laser driving circuit, wherein when recording of a signal to the signal recording layer and recording of an image to the image recording layer are simultaneously performed, the first laser diode and the second laser diode are controlled to prevent light emission from simultaneously occurring at recording levels.