# US 7,609,595 B2 · Defining from a first recording speed a second recording speed for recording on an information recording medium > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,609,595 B2 - Document ID: US7609595B2 - Status: Granted - Kind: B2 - Application number: 10/577,774 - Filed: 2004-09-29 - Published: 2007-05-17 - Granted: 2009-10-27 - Earliest claimed: 2003-10-31 - Assignees: Pioneer Corporation - Inventors: Kunihiko Horikawa; Hiroyuki Uchino; Shoji Taniguchi; Akira Shirota; Yoshio Sasaki; Eiji Muramatsu - Web page: https://patentgrep.com/patent/US7609595B2 ## CPC - G11B 7/00456: {Recording strategies, e.g. pulse sequences (G11B7/0062 takes precedence)} - G11B 7/1267: Power calibration - 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 (300) is provided with: a recording device (352) for irradiating an information recording medium (100) with laser light and for recording information onto the information recording medium; an obtaining device (354) for obtaining at least one of (i) a special OPC strategy for defining a waveform of the laser light used to calculate an optimum laser power of the laser light for recording the information at a second recording speed different from a first recording speed, at the first recording speed, and (ii) a recording strategy for defining a waveform of the laser light used to record the information at the second recording speed; a power calculating device (354) for calculating the optimum laser power by using the special OPC strategy at the first recording speed; and a controlling device (354) for controlling said recording device to record the information at the second recording speed, by using the calculated optimum laser power and the recording strategy. ## Claims ### Claim 1 An information recording apparatus comprising: a recording device for irradiating an information recording medium with laser light and for recording information onto the information recording medium; an obtaining device for obtaining at least one of (i) a special OPC strategy for defining a waveform of the laser light used to calculate, at a first recording speed, an optimum laser power of the laser light for recording the information at a second recording speed different from the first recording speed, and (ii) a recording strategy for defining a waveform of the laser light used to record the information at the second recording speed; a power calculating device for calculating the optimum laser power by using the special OPC strategy at the first recording speed; and a controlling device for controlling said recording device to record the information at the second recording speed, by using the calculated optimum laser power and the recording strategy. ### Claim 2 (depends on 1) The information recording apparatus according to claim 1, wherein said power calculating device calculates the optimum laser power by recording a test-writing pattern for calculating the optimum laser power, and the special OPC strategy makes the waveform of the laser light for recording the test-writing pattern at the first recording speed, shorter than the waveform of the laser light for recording the information at the first recording speed. ### Claim 3 (depends on 2) The information recording apparatus according to claim 2, wherein the special OPC strategy makes a percentage to shorten the waveform of the laser light for recording the test-writing pattern having a relatively short length, larger than a percentage to shorten the waveform of the laser light for recording the test-writing pattern having a relatively long length, on the basis of a length of the test-writing pattern recorded on the information recording medium. ### Claim 4 (depends on 1) The information recording apparatus according to claim 1, wherein the second recording speed is faster than the first recording speed. ### Claim 5 (depends on 1) The information recording apparatus according to claim 1, wherein an amplitude of the waveform defined by the special OPC strategy is the same as an amplitude of the waveform defined by the recording strategy. ### Claim 6 An information recording method comprising: a recording process of irradiating an information recording medium with laser light and of recording information onto the information recording medium; an obtaining process of obtaining at least one of (i) a special OPC strategy for defining a waveform of the laser light used to calculate, at a first recording speed, an optimum laser power of the laser light for recording the information at a second recording speed different from the first recording speed, and (ii) a recording strategy for defining a waveform of the laser light used to record the information at the second recording speed; a power calculating process of calculating the optimum laser power by using the special OPC strategy at the first recording speed; and a controlling process of controlling said recording device to record the information at the second recording speed, by using the calculated optimum laser power and the recording strategy. ### Claim 7 A computer readable recording medium with a computer program recorded thereon for tangibly embodying a program of instructions executable by a computer provided for an information recording apparatus, to make the computer function as at least one portion of a recording device, an obtaining device, a power calculating device and a controlling device, said information recording apparatus comprising: said recording device for irradiating an information recording medium with laser light and for recording information onto the information recording medium; said obtaining device for obtaining at least one of (i) a special OPC strategy for defining a waveform of the laser light used to calculate, at a first recording speed, an optimum laser power of the laser light for recording the information at a second recording speed different from the first recording speed, and (ii) a recording strategy for defining a waveform of the laser light used to record the information at the second recording speed; said power calculating device for calculating the optimum laser power by using the special OPC strategy at the first recording speed; and said controlling device for controlling said recording device to record the information at the second recording speed, by using the calculated optimum laser power and the recording strategy. ### Claim 8 An information recording medium comprising: a data recording area to record therein information; and a control area to record therein at least a special OPC strategy for defining a waveform of the laser light used to calculate, at a first recording speed, an optimum laser power of the laser light for recording the information at a second recording speed different from the first recording speed. ### Claim 9 (depends on 8) The information recording medium according to claim 8, wherein: a usual OPC strategy for defining a waveform of the laser light used to calculate an optimum laser power of the laser light for recording the information at the first recording speed is recorded in said control area. ### Claim 10 (depends on 8) The information recording medium according to claim 8 wherein a recording strategy for defining a waveform of the laser light used to record the information at the second recording speed is recorded in said control area.