Patent ID: 7161888
Filing Date: 2007-01-09
Classification: G11B

Abstract:
1. An information recording apparatus which irradiates a laser light on a recording medium and forms recording marks according to a recording signal, comprising: a driving source which rotationally drives the recording medium at least at a first rotation speed and a second rotation speed higher than the first rotation speed; a light source which emits the laser light; a signal generating unit which generates a recording pulse signal including a top pulse located at a front end portion and having a first magnitude, a last pulse located at a back end portion and having the first magnitude, and an intermediate bias portion located between the top pulse and the last pulse and having a second magnitude, based on the recording signal; and a control unit which irradiates a laser pulse on the recording medium by controlling the light source based on the recording pulse signal, wherein the second magnitude is smaller than the first magnitude, the intermediate bias portion is continuous in time to the top pulse, and the last pulse is continuous in time to the intermediate portion, wherein the signal generating unit shifts a position of the top pulse ahead of a position of the top pulse in a case that the recording medium is rotationally driven at the first rotation speed, when the recording medium is rotationally driven at the second rotation speed.