# US 7,609,601 B2 · Information recording apparatus, information recording method and information recording program > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,609,601 B2 - Document ID: US7609601B2 - Status: Granted - Kind: B2 - Application number: 10/594,525 - Filed: 2005-03-30 - Published: 2007-10-04 - Granted: 2009-10-27 - Earliest claimed: 2005-03-30 - Assignees: Pioneer Corporation - Inventors: Yoshio Sasaki; Hiroyuki Uchino; Kunihiko Horikawa - Web page: https://patentgrep.com/patent/US7609601B2 ## CPC - G11B 7/0062: {Overwriting strategies, e.g. recording pulse sequences with erasing level used for phase-change media} - G11B 7/00456: {Recording strategies, e.g. pulse sequences (G11B7/0062 takes precedence)} - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) ## Abstract An information recording apparatus for recording information with less waveform deformation with an adequate modulation degree and with a high asymmetry, an information recording method, and an information recording program. An information recording apparatus in which a laser beam is applied to a recording medium and a recording mark corresponding to a recording signal is formed includes a light source for emitting a laser beam and signal generating means for generating a recording pulse signal for driving the light source according to the recording signal. The recording pulse signal includes a mark period during which a recording mark is formed and a space period during which no recording mark is formed. During the mark period corresponding to a long mark, the level of the recording pulse signal corresponds to a recording power with which the reproduction compatibility is ensured and the waveform distortion is at or below a predetermined value. ## Claims ### Claim 1 An information recording apparatus which irradiates a laser light onto a recording medium and forms a recording mark corresponding to a recording signal, comprising: a light source which emits the laser light; and a signal generating unit which generates a recording pulse signal driving the light source based on the recording signal and including a mark period for forming the recording mark and a space period for forming no recording mark, wherein the signal generating unit makes a level of the recording pulse signal corresponds to a recording power ensuring reproduction compatibility in a mark period corresponding to a long mark and corresponds to a recording power having asymmetry within a predetermined range in a mark period corresponding to a short mark, thereby to generate the recording pulse signal. ### Claim 2 (depends on 1) The information recording apparatus according to claim 1, wherein the recording power ensuring the reproduction compatibility is a recording power having a modulation degree within a predetermined range. ### Claim 3 (depends on 2) The information recording apparatus according to claim 2, wherein the recording power having the modulation degree within the predetermined range is a recording power having a modulation degree equal to or larger than 60%. ### Claim 4 (depends on 1) The information recording apparatus according to claim 1, wherein the recording power having the asymmetry within the predetermined range is a recording power having asymmetry within a range of −0.05 to 0.15. ### Claim 5 (depends on 1) The information recording apparatus according to claim 1, wherein the short mark is a shortest mark, and the long mark is a mark other than the short mark. ### Claim 6 (depends on 1) The information recording apparatus according to claim 1, wherein the short mark is a shortest mark and a second shortest mark, and the long mark is a mark other than the short mark. ### Claim 7 (depends on 1) The information recording apparatus according to claim 1, wherein the short mark is a mark having a level of no largest magnitude, and the long mark is a mark having a level of the largest magnitude. ### Claim 8 (depends on 1) The information recording apparatus according to claim 1, wherein the recording pulse signal has a same level for all the long marks. ### Claim 9 (depends on 1) The information recording apparatus according to claim 1, wherein the recording pulse signal has different levels for each of the short marks. ### Claim 10 An information recording apparatus which irradiates a laser light onto a recording medium and forms a recording mark corresponding to a recording signal, comprising: a light source which emits the laser light; and a signal generating unit which generates a recording pulse signal driving the light source based on the recording signal and including a mark period for forming the recording mark and a space period for forming no recording mark, wherein the signal generating unit makes a level of the recording pulse signal corresponds to a recording power having waveform distortion equal to or smaller than a predetermined value in a mark period corresponding to a long mark and corresponds to a recording power having asymmetry within a predetermined range in a mark period corresponding to a short mark, thereby to generate the recording pulse signal. ### Claim 11 (depends on 10) The information recording apparatus according to claim 10, wherein the recording power having the waveform distortion equal to or smaller than the predetermined value is a recording power having waveform distortion equal to or smaller than 10%. ### Claim 12 (depends on 10) The information recording apparatus according to claim 10, wherein the recording power having the waveform distortion equal to or smaller than the predetermined value is a recording power having waveform distortion of 0. ### Claim 13 An information recording apparatus which irradiates a laser light onto a recording medium and forms a recording mark corresponding to a recording signal, comprising; a light source which emits the laser light; and a signal generating unit which generates a recording pulse signal driving the light source based on the recording signal and including a mark period for forming the recording mark and a space period for forming no recording mark, wherein the signal generating unit makes a level of the recording pulse signal corresponds to a recording power ensuring reproduction compatibility and having waveform distortion equal to or smaller than a predetermined value in a mark period corresponding to a long mark and corresponds to a recording power having asymmetry within a predetermined range in a mark period corresponding to a short mark, thereby to generate the recording pulse signal. ### Claim 14 An information recording method which irradiates a laser light onto a recording medium and forms a recording mark corresponding to a recording signal, comprising: a signal generating process which generates a recording pulse signal driving a light source based on the recording signal and including a mark period for forming the recording mark and a space period for forming no recording mark; and an irradiating process which irradiates a laser pulse onto the recording medium based on the recording pulse signal, wherein the signal generating process makes a level of the recording pulse signal corresponds to a recording power ensuring reproduction compatibility in a mark period corresponding to a long mark and correspond to a recording power having asymmetry within a predetermined range in a mark period corresponding to a short mark, thereby to generate the recording pulse signal. ### Claim 15 An information recording method which irradiates a laser light onto a recording medium and forms a recording mark corresponding to a recording signal, comprising a signal generating process which generates a recording pulse signal driving a light source based on the recording signal and including a mark period for forming the recording mark and a space period for forming no recording mark; and an irradiating process which irradiates a laser pulse onto the recording medium based on the recording pulse signal, wherein the signal generating process makes a level of the recording pulse signal corresponds to a recording power having waveform distortion equal to or smaller than a predetermined value in a mark period corresponding to a long mark and correspond to a recording power having asymmetry within a predetermined range in a mark period corresponding to a short mark, thereby to generate the recording pulse signal. ### Claim 16 An information recording method which irradiates a laser light onto a recording medium and forms a recording mark corresponding to a recording signal, comprising: a signal generating process which generates a recording pulse signal driving a light source based on the recording signal and including a mark period for forming the recording mark and a space period for forming no recording mark; and an irradiating process which irradiates a laser pulse onto the recording medium based on the recording pulse signal, wherein the signal generating process makes a level of the recording pulse signal corresponds to a recording power ensuring reproduction compatibility and having waveform distortion equal to or smaller than a predetermined value in a mark period corresponding to a long mark and correspond to a recording power having asymmetry within a predetermined range in a mark period corresponding to a short mark, thereby to generate the recording pulse signal. ### Claim 17 A computer-readable recording medium with a computer program recorded thereon executed in an information recording apparatus including a light source, irradiating a laser light onto a recording medium to form a recording mark corresponding to a recording signal, and making the information recording apparatus execute: a signal generating process which generates a recording pulse signal driving the light source based on the recording signal and including a mark period for forming the recording mark and a space period for forming no recording mark; and an irradiating process which irradiates a laser pulse onto the recording medium based on the recording pulse signal, wherein the signal generating process makes a level of the recording pulse signal corresponds to a recording power ensuring reproduction compatibility in a mark period corresponding to a long mark and correspond to a recording power having asymmetry within a predetermined range in a mark period corresponding to a short mark, thereby to generate the recording pulse signal. ### Claim 18 A computer-readable recording medium with a computer program recorded thereon executed in an information recording apparatus including a light source, irradiating a laser light onto a recording medium to form a recording mark corresponding to a recording signal, and making the information recording apparatus execute: a signal generating process which generates a recording pulse signal driving the light source based on the recording signal and including a mark period for forming the recording mark and a space period for forming no recording mark; and an irradiating process which irradiates a laser pulse onto the recording medium based on the recording pulse signal, wherein the signal generating process makes a level of the recording pulse signal corresponds to a recording power having waveform distortion equal to or smaller than a predetermined value in a mark period corresponding to a long mark and correspond to a recording power having asymmetry within a predetermined range in a mark period corresponding to a short mark, thereby to generate the recording pulse signal. ### Claim 19 A computer-readable recording medium with a computer program recorded thereon executed in an information recording apparatus including a light source, irradiating a laser light onto a recording medium to form a recording mark corresponding to a recording signal, and making the information recording apparatus execute: a signal generating process which generates a recording pulse signal driving the light source based on the recoding signal and including a mark period for forming the recording mark and a space period for forming no recording mark; and an irradiating process which irradiates a laser pulse onto the recording medium based on the recording pulse signal, wherein the signal generating process makes a level of the recording pulse signal corresponds to a recording power ensuring reproduction compatibility and having waveform distortion equal to or smaller than a predetermined value in a mark period corresponding to a long mark and correspond to a recording power having asymmetry within a predetermined range in a mark period corresponding to a short mark, thereby to generate the recording pulse signal.