Sony Corporation

U.S. Philips Corporation

Sony Disc & Digital Solutions Inc.

Koninklijke Philips Corporation N.V.

Ajinomoto Co., Ltd.

Sanofi

Sopharma S.a.

Sony Dadc Corporation

Tadao Suzuki

Tadao Yoshida

Shigeaki A Wachi

Yoshizumi Inazawa

Sohmei Endoh

Muneyasu Maeda

Hiroshi Nakayama

Johannes Jan Mons

Makoto Akune

Hiroyuki Takemoto

Johannes M M Verbakel

Yoichiro Sako

Atsushi Takeuchi

Shunsuke Furukawa

Kazuya Hayashibe

Jun Nakano

Miki Abe

Jun Shimizu

Constant P Baggen

Yoshihito Fukushima

Mitsuo Arima

Kimitaka Nishimura

Tsuneo Furuya

Shoichi Nakamura

Hirohito Kawada

Ikuhiro Hideta

Tooru Nagai

Shirasagi Toshihiko

Gen Ichimura

Kenzo Akagiri

Akio Takada

Yoshio Osakabe

Kenichi Imai

Makoto Watanabe

Takuji Shibata

Yasuhiro Ogura

Katsuhiko Ohtomo

Hisao Nishioka

Takeshi Fukami

Takahiro Igari

Tadayuki Honda

Balthasar A Van Luyt

Yoshihiro Kanno

Kazuhiko Kamimura

Marinus J Monen

Yasuo Sugimoto

Yutaka Ohkubo

Yukio Kondo

Yuko Asano

Shunske Furukawa

Lambertus M Van Den Hoven

Audio-centered information is stored on a unitary medium by using a Table-of-Contents (TOC) mechanism that specifies an actual configuration of various audio items on the medium. In particular, each one of a set of one or more Track Areas gets at least two mutually logically conforming Sub-TOCs assigned. This allows to retrieve any constituent Sub-TOC part from at least any correct copy of the Sub-TOCs. Furthermore, one or more Master-TOCs are provided for specifically pointing to each of the Sub-TOCs.

Storing audio-centered information with a multi-level table-of-contents (TOC) mechanism having redundant sub-TOCs

In an optical device, a number of structures having higher portions or lower portions are arranged at a fine pitch equal to or shorter than a wavelength of visible light on a surface of a base. Each of the structures is arranged to form a plurality of arc track rows on the surface of the base, and to form a quasi-hexagonal lattice pattern, and the structure has an elliptical cone or truncated elliptical cone shape having a major axis in a circumferential direction of the arc tracks.

Optical device, method for producing master for use in producing optical device, and photoelectric conversion apparatus

Binary information previously recorded in an innermost rim side area is enabled to be stably reproduced. A record medium is formed by sequentially laminating a first information layer, an intermediate layer, a second information layer, and a cover layeronto a substrate. First grooves are previously formed in the innermost rim area of the substrate. Second grooves are previously formed in an area where data is recorded. The first grooves are set to be shallower and narrower than the second grooves. Thus, such a situation that a BCA signal is modulated by diffraction due to the grooves can be reduced.

Record medium, its manufacturing method, mother disc for record medium, and its manufacturing method

In an optical recording and reproducing medium having a grooveformed along a recording track and which is recorded and/or reproduced with irradiation of light L having a predetermined wavelength &#x3bb;, a track pitch p of the grooveis selected in a range of from 200 nm to 350 nm and a ratio w'/p between a width wof the grooveand the track pitch p is selected in a range of from 0.24 to 0.67.

Manufacturing method for optical recording and reproducing medium stamper

An optical recording/reproducing medium having grooves formed along recording tracks and used for recording/reproducing when irradiated with light L with a specified wavelength &#x3bb;, wherein the track pitch p of a groove is at least 200 nm and up to 350 nm, and a ratio w/p between the width wof a groove and a track pitch p is at least 0.24 and up to 0.67.

Optical recording medium having a relationship between groove width and track pitch

An optical information recording medium, which includes both of a land surface and a groove surface as a recording track and presents high signal quality. The optical information recording medium includes both a land and a groove as the recording track on a substrate, in which a laser light is irradiated from a reverse side of the substrate to thereby carry out a recording and a reproduction, and an inclination angle of a groove side is 25&#xb0; or more and 40&#xb0; or less, and both of arithmetic average roughness (Ra) on the land surface and the groove surface are assumed to be 0.2 to 0.7 nm.

Optical information recording medium, original disc for optical information recording medium, and method of manufacturing the same

Storing audio-centered information with a multi-level table-of contents (TOC) mechanism having redundant sub-TOCs

A signal level detector to detect the level of 1-bit digital signal is provided. It includes a level detector () supplied with a sequence of 1-bit digital signals decoded by an audio decoder () and which counts the number of 0 (zeros) or 1 (ones) included in the row of a predetermined number n of 1-bit digital signals to detect the level of the 1-bit digital signal, and an indication unit () to indicate the signal level detected by the level detector ().

Signal level detection apparatus and detection method, and signal level indication apparatus

Optical information recording medium

METHOD, DEVICE, AND INFORMATION STRUCTURE FOR STORING AUDIO-CENTERED INFORMATION WITH A MULTI-LEVEL TABLE-OF-CONTENTS (TOC) MECHANISM AND DOUBLING OF AREA-TOCS, A DEVICE FOR USE WITH SUCH MECHANISM AND A UNITARY STORAGE MEDIUM HAVING SUCH MECHANISM

A recording apparatus for modulating a master key used for encrypting main data in a pit-width direction by changing a light amount of a laser beam to then record it on an optical recording medium and records the main data encrypted by using the master key with correcting the main data so as to have a certain pit width and a pit length so that a jitter resulting in intersymbol interference of adjacent pits should be reduced. A reproducing apparatus for reproducing the recorded optical recording medium, and to thereby prevent an optical recording medium from being duplicated by an illegal copy.

Recording apparatus, reproducing apparatus and optical recording medium

A recording medium conforming with a specific physical format of Digital Video Disc/Digital Versatile Disc (DVD) or the like is contrived to achieve superior sound quality in audio data recording and reproduction, common usability of data, and enhanced interchangeability of an apparatus. In this recording medium, identification data signifying the existence of recorded data of a second data format such as Direct Stream Digital Disc (DSD) different from a first data format such as DVD is included in physical format management information recorded in a lead-in area. The data of such second data format is recorded in a data area in conformity with the physical format management information. And second data management information of a Table of Contents (TOC) is recorded at a predetermined position to manage an operation of reproducing the data of the second data format.

Recording medium with format for preventing unauthorized copying, and

A system wherein management data for managing allowance or unallowance (i.e., prohibition) of copies on a recording medium are recorded, and a time restriction condition, an area limiting condition, a condition for restricting a copy mode, etc. are managed on the basis of the recorded copy management data. When data are copied to different recording media, the copy management data are recorded together with the main data, thereby restricting the reproducing operation of the main data.

Recording medium having digital copy management data recorded therein,

A recording method for a disc-shaped recording medium formed by cementing two disc members having a recording layer on one surface, a diameter of approximately 12 cm and a thickness of approximately 0.6 mm, includes the steps of generating a digital audio signal that is generated by performing a .SIGMA..increment.-modulation for converting an analog audio signal with a sampling frequency set to a multiple of the standard compact disc sampling frequency fs=44.1 kHz, and recording the generated digital audio signal to the disc-shaped recording medium.

Method of recording on a disc medium a .SIGMA..DELTA.-modulated signal

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Tokyo, Japan

Tadao Suzuki