Patent ID: 7474601

Claim:
An information recording apparatus irradiating a laser beam on a recording medium and forming a recording mark corresponding to a recording signal, comprising: a light source which emits the laser beam; a signal generating device which generates a recording pulse signal; and a control device which drives the light source on the basis of the recording pulse signal to irradiate laser pulses on the recording medium, wherein the recording pulse signal includes a mark period in which the recording mark is formed, and a space period in which the recording mark is not formed, wherein the recording pulse signal, to form the recording mark not longer than a predetermined length, includes a first-type recording pulse having a single amplitude level, wherein the recording pulse signal, to form the recording mark longer than the predetermined length, includes a second-type recording pulse having a top pulse with a first amplitude level corresponding to a first recording power, and an intermediate bias portion having a second amplitude level corresponding to a second recording power which is lower than the first recording power and continuously existing from a terminating position of the top pulse to a terminating position of the second-type recording pulse, wherein the second amplitude level of the intermediate bias portion is constant, and wherein the top pulse of the second-type recording pulse has a constant width irrespective of the length of the recording mark.