Sony Corporation

Sony Dadc Corporation

Sony Disc & Digital Solutions Inc.

Shinobu Hayashi

Akiya Saito

Toru Aida

Tatsuya Inokuchi

Akitoshi Suzuki

Asako Kawakami

Information unique on a group basis is allowed to be efficiently added to a recording medium in which read-only contents data is recorded. Master data (cutting master) having a data structure in which data to be replaced is managed by a file system as data to be arranged in a specific folder or a specific file is produced by authoring. In manufacturing of a recording medium master disc through premastering and mastering using the master data, replacement data unique to each group is prepared, and the data to be replaced is replaced with the replacement data to perform the mastering (master disc exposure). Then, a stamper is produced from the produced master disc, and recording media is mass-produced by using the stamper. In other words, the replacement data are changed on the group basis to allow the recording media in which the replacement data (such as GPand GP) unique to each group is recorded as read-only data to be manufactured, as recording media containing the same content.

Method of manufacturing master disc, method of manufacturing recording medium, program, and recording medium

A master strategy adjustment method includes performing first recording on a master with a predetermined strategy, performing first measurement of an evaluation value of the master of the first recording, forming a first optical disc based on the master after the first recording, performing second measurement of an evaluation value of the optical disc formed as the first optical disc, calculating a target value of the evaluation value of the master based on a difference with the first measurement evaluation value and the second measurement evaluation value, and adjusting the strategy so that the evaluation value with regard to the master matches the target value, performing recording on the master with the adjusted writing strategy, performing measurement of the evaluation value of the master, and performing determination of whether the evaluation value is within a predetermined range with the target value as a reference until an affirmative result is obtained.

Master strategy adjustment method and disc manufacturing method

A recording apparatus includes a rotation driving portion that rotates and drives an optical disc master; and a recording portion that performs an information recording on the optical disc master, by performing a laser beam irradiation on the optical disc master, based on a recording waveform which has a land pulse of a first power, a recording waveform portion having a recording pulse of a second power higher than the first power, and a cooling pulse which has a third power lower than the first power and is inserted between the land pulse and the recording waveform portion.

Recording apparatus, master manufacturing apparatus, and method of manufacturing an optical disc recording medium

A recording drive waveform adjusting method for manufacturing a master disc is provided. The method includes forming an exposed area in an inorganic resist layer for test exposure by irradiating a master disc having the inorganic resist layer with laser light of a recording power based on a recording drive waveform according to a test recording signal. The method also includes obtaining reflected-light information by irradiating the exposed area formed in the test exposure with laser light of a reproducing power, determining whether the recording drive waveform is appropriate by using the reflected-light information, and correcting the recording drive waveform if the recording drive waveform is determined to be inappropriate in the determination.

Recording drive waveform adjusting method for manufacturing master disc, master disc manufacturing method, master disc manufacturing apparatus, and master disc

A reproduction control method adopted by an information-processing apparatus such as a personal computer for the purpose of protecting copyrights imposes a restriction on an operation carried out by a media reproduction apparatus such as a disc drive apparatus to reproduce musical data or the like (from a recording medium mounted on the media reproduction apparatus). A command issued by the processing main member of the information-processing apparatus (including application programs and an OS) to the media reproduction apparatus such as the disc drive apparatus to read out data recorded on the recording medium in a predetermined format is monitored. If the issuance of a command to read out data recorded in a predetermined format is confirmed, a copyright protection process is carried out to protect a copyright. The copyright protection process is a process to prohibit or conditionally permit a suck-up operation (to transfer the musical data from the recording medium to the personal computer).

Growing community of inventors

Shizuoka, Japan

Shinobu Hayashi