Panasonic Corporation

Matsushita Electric Industrial Co., Ltd.

Shuichi Tasaka

Mamoru Shoji

Kenji Koishi

Eiichi Igami

Takashi Ishida

Atsushi Nakamura

Takashi Inoue

Hiroyuki Yamaguchi

The invention provides an information recording medium including highly reliable power calibration areas, as well as an information recording and reproducing device utilizing it. The medium is an information recording medium having a recording layer including a data recordable areafor recording user information signals, a lead-in area provided on the inner periphery of the data recordable area, an inner power calibration area provided further on the inside of the lead-in area for recording test recording patterns, and a recording management area for recording management information related to the inner power calibration area. An outer power calibration areais provided on the outer periphery of the final point of recording of the user information signal on the recording layer.

Information recording medium with power calibration area

The optical data recording method comprising the steps of: modulating data to be recorded, to generate a plurality of recording modulation codes; and emitting a pulse-like light beam to an optical disc, so that a plurality of recording marks and spaces which have lengths corresponding to the plurality of recording modulation codes are formed on the optical disc. In the optical data recording method, at least two of the plurality of recording marks comprises: a first pulse which is disposed at a front and forms a leading edge of the recording mark, a last pulse which is disposed at a backend and forms a trailing edge of the recording mark, and a multi-pulse train which is disposed between the first pulse and the last pulse and forms a center of the recording mark. The multi-pulse train has a pulse period longer than T which represents a reference period of the recording modulation code.

Optical data recording method

A method of determining a recording power used to record information to an optical disc, includes carrying out test recording which records predetermined data to a predetermined area of the optical disc to determine the recording power, and recording predetermined data with a power equal to or more than the determined recording power to an area adjacent to the predetermined area.

Optical disc apparatus and recording power determining method thereof

An optical disk, which has a storage area is disclosed. Data is recorded and reproduced by emitting laser light into the storage area on the optical disk Power condition information and recording write strategy information which correspond to recording speed information for recording and reproducing data are recorded. The recording speed information is indicative of constant linear velocity and different linear velocity from the constant linear velocity.

Recordable optical disc, optical disc recording apparatus, optical disc reproduction apparatus, and method for recording data onto recordable optical disc

A method is provided for producing a data storage medium by recording disc information on the data storage medium.

Recording method and media having marks and spaces with lengths defined by a predetermined modulation method

A data storage medium is provided on which data is to be recorded by modulating the data to generate a plurality of recording modulation codes and irradiating a pulse-like light beam to the data storage medium, so that a plurality of recording marks and spaces which have lengths corresponding to the plurality of recording modulation codes are formed on the data storage medium. At least two of the plurality of recording marks are formed by the light beam emitted according to a recording pulse train. The recording pulse train comprising a first pulse which is disposed at a front and forms a leading edge of the recording mark, a last pulse which is disposed at a backend and forms a trailing edge of the recording mark, and a multi-pulse train which is disposed between the first pulse and the last pulse and forms a center of the recording mark. The multi-pulse train has a pulse period longer than T which represents a reference period of the recording modulation code. The plurality of recording marks have different lengths represented by T with each other. A number of pulses in each of the recording pulse trains is increased by one as the recording mark is increased in length by 2T. A shortest recording mark and a second shortest recording mark are constituted of a single pulse, respectively.

A data storage medium is provided on which data is to be recorded by modulating the data to generate a plurality of recording modulation codes and irradiating a pulse-like light beam to the data storage medium, so that a plurality of recording marks and spaces which have lengths corresponding to the plurality of recording modulation codes are formed on the data storage medium. The data storage medium comprises a disc information area that includes a region on which at least one of an irradiation information of the light beam to form the recording marks and a constitution information of the recording mark is to be recorded. At least two of the plurality of recording marks are formed by the light beam emitted according to a recording pulse train. The recording pulse train comprises a first pulse which is disposed at a front and forms a leading edge of the recording mark, a last pulse which is disposed at a backend and forms a trailing edge of the recording mark, and a multi-pulse train which is disposed between the first pulse and the last pulse and forms a center of the recording mark. The multi-pulse train has a pulse period longer than T which represents a reference period of the recording modulation code. The plurality of recording marks have different lengths represented by T with each other. A number of pulses in each of the recording pulse trains is increased by one as the recording mark is increased in length by 2T. A shortest recording mark and a second shortest recording mark are constituted of a single pulse, respectively. Each of the multi-pulse trains has an equal pulse width and pulse interval in the plurality of recording marks.

A DVD-R recorder according to the invention detects an item of recording speed information (d) from a DVD-R () on which histories of recording speed information, write strategy, and recording power condition are stored. When the decoded item of recording speed information (d) agrees with a set item of recording speed information (d), the recorder detects the write strategy (d) and the recording power condition (d) corresponding to the decoded item of recording speed information (d). A recording-pulse-determination section () converts a recording pattern (d) into a recording pulse (d) according to the write strategy (d). A recording-power-determination section () performs an OPC based on the recording power condition (d). The recording power condition (d) may include information specifying that a recording pulse corresponding to the front edge of a recorded mark has a larger recording power than other recording pulses.

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Takarazuka, Japan

Shuichi Tasaka