Kabushiki Kaisha Toshiba

Memory-tech Corporation

Tokyo Shibaura Denki Kabushiki Kaisha

Toshihiro Sugaya

Yoshinori Honguh

Masato Otsuka

Hisashi Yamada

Toru Kambayashi

Kazuo Sumita

Koichiro Akiyama

Hideki Hirakawa

Norio Nakamura

Shuichi Tsujimoto

Masahiko Tanaka

Kazunori Moriya

Nobuyuki Takagi

Kazuo Watabe

Naomasa Nakamura

Yuji Sakai

Toyoki Taguchi

Hiromichi Kobori

Nobuhisa Yoshida

Takehito Yamada

Kei Shimura

Hideo Ando

Akihito Ogawa

Chosaku Noda

Hiroshi Hasegawa

Teruo Murakami

Isao Hoshino

Hiroharu Satoh

Kimiyoshi Ban

Akihiro Isomura

Hiroharu Sato

Sadanari Fujimoto

Takao Muraoka

A single disc is configured to deal with both HD DVD information and DVD information. This invention has the following basic elements (1) a single-sided dual layer optical disc where a light transmission layer, a first recording layer accessed with a first laser beam, an space layer, and a second recording layer accessed with a second laser beam are arranged in that order in the direction in which a laser beam enters, (2) the areal recoding density of the second recording layer is three times or more that of the first recording layer, (3) information indicating that the second recording layer has been formed is formed in the first recording layer, and (4) information indicating that the first recording layer has been formed is formed in the second recording layer.

Optical disc, optical disc apparatus, and optical disc reproducing method

An information recording apparatus comprises an encryption section encrypting contents information and also a license condition referred to to limit use of the contents information and a decoding key for decoding the encrypted contents information to generate license information, and a recording section recording the encrypted contents information and the generated license information on a recording medium. An information reproducing apparatus comprises a decoder unit decoding the license information recorded on the recording medium using a second decoding key for decoding the license information and deciding on the basis of the license condition contained in the decoded license information whether the contents information can be used. If it is decided that the contents information can be used, the encrypted contents information recorded on the recording medium is decoded using the first decoding key contained in the decoded license information.

Information recording apparatus, information reproducing apparatus, and information distribution system

A single-sided dual-layer optical disc comprising an optically transparent layer; a first recording layer accessed by a first laser beam; an intermediate layer; and a second recording layer accessed by a second laser beam, wherein the optically transparent layer, the first recording layer, the intermediate layer, and the second recording layer are sequentially disposed in a laser beam incidence direction, wherein a thickness of the optically transparent layer, which is a distance from a light incident surface to the first recording layer, is 550 to 575 &#x3bc;m, wherein a thickness of the intermediate layer, which is a distance between the first and second recording layers, is 29 to 47 &#x3bc;m, and wherein a surface recording density of the second recording layer is at least 3 times that of the first recording layer.

Optical disc and optical disc device

An optical disc is based on the following the distance of the light transmission layer from a light incidence plane to the first recording layer is a minimum of 550 &#x3bc;m. The distance between the first and the third recording layer is a maximum of 72 &#x3bc;m. The distance between the second and the third recording layer is a minimum of 15 &#x3bc;m. The distance between the first and the second recording layer is about 31 to 40 &#x3bc;m. The reflectivities of the first and the second recording layer with respect to the first laser beam are 18% or more, and the ratio between the reflectivities is about 1.15 or less. The areal recording density of the third recording layer is three times or more as high as the areal recording density of the first and the second recording layer.

Single-sided triple layer optical disc

According to one embodiment, an optical disc is the following the distance between a light incidence plane and the first recording layer is a minimum of 550 &#x3bc;m. The distance between the first and the third recording layer is a maximum of 72 &#x3bc;m. The distance between the second and the third recording layer is a minimum of 15 &#x3bc;m. The distance between the first and the second recording layer is about 31 to 40 &#x3bc;m. The reflectivities of the first and the second recording layer with respect to the first laser beam range from 18 to 27%, and the ratio therebetween is about 1.1 or less. The reflectivity of the third recording layer is below about 6%. The areal recording density of the third recording layer is three times or more as high as that of the first recording layer and the second recording layer.

Optical disc, optical disc manufacturing method, and optical disc apparatus

An optical disc of this invention is configured to be capable of dealing with both information in HD DVD and information in DVD. The optical disc is basically specified by the following items (1) to (7): (1) the optical disc is a single-sided dual layer optical disc where a light transmission layer, a first recording layer accessed with a first laser beam, an space layer, and a second recording layer accessed with a second laser beam are arranged in that order in the direction in which the laser beam enters, (2) the areal recoding density of the second recording layer is three times or more as high as that of the first recording layer, (3) identifying information which indicates that the first recording layer has been formed is formed in the second recording layer, (4) the distance in the light transmission layer from the incidence plane to the first recording layer is 550 &#x3bc;m or more, (5) the distance in the light transmission layer from the incidence plane to the second recording layer is 622 &#x3bc;m or less, (6) the reflectivity of the first recording layer with respect to the first laser beam is 45% to 65%, and (7) the reflectivity of the second recording layer with respect to the second laser beam is 15% to 29%.

Optical disc, optical disc apparatus, optical disk reproducing method, and digital work publication

User data recording areas and intermediate areas are alternately arranged on a disk. The intermediate area records at least information for synchronization.

Optical recording medium, information reproduction apparatus, and information recording/reproduction apparatus

A disk-shaped information recording medium has spiral tracks in which land- and groove-shaped tracks are alternately switched in units of rounds, and one index header which is aligned in the radial direction of a disk and is allocated at only the boundary between the land- and groove-shaped tracks.

Information recording medium with index header

An information recording medium has a plurality of stacked recording layers. Each recording layer has a spiral track which defines a plurality of rounds, and at least one index header aligned in the radial direction of the disk to partially intercept the spiral track. The index header has address data of each round of the spiral track, which is formed by embossed pits, and some or all of the index headers of the first and second recording layers are laid out to overlap each other when viewed from the predetermined surface.

An optical disk with sectional trapezoidal pits comprising a substrate having information recorded by a plurality of pit trains formed thereon at a specified track pitch, and a reflective layer formed on the substrate, wherein the information is reproduced by being irradiated with light beam via an objective lens, the track pitch is set within the range of (0.72 to 0.8) &agr;&times;&lgr;/NA/1.14 &mgr;m when a wavelength of the light beam is &mgr; nm and a numerical aperture of the objective lens is NA, each of the pits is a multiplication ratio used to secure allowable disk tilt angles in an upper width within the range of (0.3 to 0.50) &agr;&times;&lgr;/NA/1.14 &mgr;m, a bottom width within the range of (0.2 to 0.32) &agr;&times;&lgr;/NA/1.14 &mgr;m and a depth within the range of (1/4.2&times;&lgr;/n) to (1/5.2 &lgr;/n) (n: refractive index of said substrate and &lgr;: a wavelength) and obtained by 2.623&times;10 &times;(d/&lgr;) &minus;1.706&times;10 (d /&lgr;)&plus;0.934, where d is thickness of the substrate.

Optical disk having specified track pitch, and optical disk apparatus

Optical disk and optical disk apparatus

An information recording apparatus comprises an encryption section encrypting contents information and also a license condition referred to limit use of the contents information and a decoding key for decoding the encrypted contents information to generate license information, and a recording section recording the encrypted contents information and the generated license information on a recording medium. An information reproducing apparatus comprises a decoder unit decoding the license information recorded on the recording medium using a second decoding key for decoding the license information and deciding on the basis of the license condition contained in the decoded license information whether the contents information can be used. If it is decided that the contents information can be used, the encrypted contents information recorded on the recording medium is decoded using the first decoding key contained in the decoded license information.

An optical disk used for writing and reading data in units of an error correction block containing a plurality of sectors by means of a light beam and comprising land and groove tracks arranged adjacent to one another and a plurality of emboss pits formed on a boundary between the land and the groove tracks to detect respective positions of the error correction blocks.

Optical disk having radial lands and grooves, and boundary recognition marks, and optical disk apparatus for emitting a light beam to an optical disk having a plurality of error correction blocks after boundary recognition marks

The present invention is directed to a mail-order shopping system which allows a user to do electronic mail-order shopping by a simple operation without using a personal computer and to correctly acquire information of goods. An adapter including both a memory for registering user's information specifying a user and a modem for communicating with a mail-order firm, is connected to the DVD reproduction apparatus. The catalog information, recognition information of the mail-order firm, and communication programs representing a procedure for communication from the user to the mail-order firm, which are stored in a DVD for mail-order shopping, are reproduced by the DVD reproduction apparatus. The catalog information is displayed on a TV display, and both information of desired goods selected by the user and user's information registered in the memory of the adapter, are transmitted through a modem on the basis of the reproduced communication programs.

Growing community of inventors

Kitasoma-gun, Japan

Toshihiro Sugaya