Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Other

Victor Company of Japan, Limited

Matsushita Electrical Industrial Co., Ltd.

Kenji Koishi

Mitsuaki Oshima

Yoshiho Gotoh

Shinichi Tanaka

Mitsuro Moriya

Yoshinari Takemura

Mamoru Shoji

Mitsurou Moriya

Shuichi Tasaka

Isao Satoh

Tomio Yoshida

Shunji Ohara

Takashi Ishida

Eiichi Igami

Atsushi Nakamura

Shigeru Furumiya

Makoto Usui

Toyoji Gushima

Tamotsu Matsuo

Kohjyu Konno

Shin-ichi Tanaka

Norio Miyatake

Motoyoshi Murakami

Shinichi Konishi

Yutaka Osada

Yuichi Kamioka

Yuuichi Kamioka

Shunji Harigae

Yasuhiro Ueki

Yuzuru Kuroki

Yoshiyuki Miyabata

Satoshi Kondo

Takeshi Nakajima

Junichi Minamino

Naoyasu Miyagawa

Daisuke Ogata

Hironori Deguchi

Kenzo Ishibashi

Chikashi Inokuchi

Yoshiharu Kobayashi

Takashi Kawai

Shinji Kubota

Naoyuki Nakamura

Ryoji Yamaguchi

Kenichi Tatehara

Hideharu Eguchi

Tomonori Ueno

Mari Kimura

Kiyoshi Nakamori

Toru Fujimoto

Ikuo Hidaka

Yoshitaka Mitui

Osamu Yanagisawa

Mitsuhiko Oohta

Yoshino Gotoh

Yoshiro Gotoh

Jun-ichi Ninamino

Katsuhiko Yoshida

Shin-Ichi Tanaka

Disclosed is an optical disk barcode forming method wherein, as information to be barcoded, position information for piracy prevention, which is a form of ID, is coded as a barcode and is recorded by laser trimming on a reflective film in a PCA area of an optical disk. When playing back the thus manufactured optical disk on a reproduction apparatus, the barcode data can be played back using the same optical pickup.

Optical disk, an optical disk barcode forming method, an optical disk reproduction apparatus, a marking forming apparatus, a method of forming a laser marking on an optical disk, and a method of manufacturing an optical disk

A recording method is provided, which comprises the steps of (a) generating a plurality of pulse sequences corresponding to a plurality of linear velocities, (b) while rotating a recording medium with a linear velocity selected from the plurality of linear velocities, forming at least one of a recording mark and a space by irradiating the recording medium with a pulse sequence selected from the plurality of pulse sequences, the pulse corresponding to the linear velocity. The step (a) comprises the steps of (a-1) measuring at least one first recording parameter corresponding to at least one linear velocity selected from the plurality of linear velocities, (a-2) determining a second recording parameter corresponding to the plurality of linear velocities based on the at least one first recording parameter measured, and (a-3) generating the plurality of pulse sequences corresponding to the plurality of linear velocities based on the second recording parameter measured.

Recording method, recording apparatus, and recording medium

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

The operating and other procedures of a disk or recording medium application system of the type for which a network is used are simplified. Disks or recording media have auxiliary data recording areas, where different IDs for individual disk, and/or cipher keys and/or decoding keys for ciphers are recorded in advance in a factory. By using the IDs to release the soft ciphers, and using the cipher keys when sending the ciphers, and using the decoding keys when receiving the ciphers, user authorization procedures are simplified.

Recording medium reproducer, cryptocommunication system and program license system

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. 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 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.

An information recording method is provided, which comprises the steps of (a) determining a power level of a pulse sequence, (b) generating the pulse sequence based on the power level determined, and (c) irradiating an information recording medium with light corresponding to the pulse sequence generated to record information represented by at least either a recording mark or a space onto the information recording medium. The pulse sequence comprises a multi-pulse chain for forming the recording mark. The multi-pulse chain comprises a plurality of pulses having a peak power level. In the step (a), a bottom power level is determined between the peak power level and an erase power level which is lower than the peak power level while keeping an interpulse spacing constant.

Information recording method, information recording apparatus and information recording medium

An optical disk that includes main information and write-once information recorded on the optical disk. The write-once information is recorded as information unique to the optical disk, and the write-once information stores at least watermark production parameters for producing a watermark.

Magneto-optical recording medium having watermark for preventing unauthorized copy

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Sanda, Japan

Kenji Koishi