Patent ID: 7190659
Filing Date: 2007-03-13
Classification: G11B

Abstract:
1. An optical information recording method of recording information on an optical information recording medium by irradiation of laser beam, the method being for only write-once recording, and the method comprising the steps of: forming a recording waveform which forms a first pit having a shortest pit length, by using a top pulse having a width narrower than a width of a channel clock cycle; forming a recording waveform which forms a second pit that is second shortest following the first pit, by using the top pulse and a terminal pulse having a width narrower than the width of the channel clock cycle; and forming a recording waveform which forms a pit that is longer than the second pit, by using the top pulse, the terminal pulse, and at least one multipulse formed between the top pulse and the terminal pulse, wherein, among top pulses of pits, a width of a top pulse having a shortest pulsewidth is in a range of 20% to 70% of a width of a top pulse having a longest pulsewidth, and wherein, when “L” represents an interval between pits to be formed, a width of one top pulse, immediately before which a width of the interval L is shortest among the intervals, is in a range of 1% to 50% of a width of another top pulse, immediately before which a width of the interval L is longest among the intervals.