Kabushiki Kaisha Toshiba

Tadashi Kobayashi

Hisashi Yamada

Atsushi Inoue

Naomasa Nakamura

Akinori Koga

Takanari Okamura

Shokou Ito

Naoki Morishita

Yoshinori Honguh

Toyoki Taguchi

Hiroshi Hasegawa

Hideo Ando

Tomoo Yamakage

Katsumi Suzuki

Shinichi Kikuchi

Kazuhiko Taira

Hideki Mimura

Yasufumi Tsumagari

Hideki Takahashi

Masahiko Yamada

Takeshi Takahara

Masao Itoh

An information recording medium comprising a substrate having a recording surface provided with emboss pits or guiding grooves, a reflective film formed on the recording surface of the substrate, and a first protective film formed on the reflective film. This information recording medium is featured in that both sides of the information recording medium are constituted by a first surface provided with the protective film and by a second surface formed opposite to the first surface, and that an irradiated light beam is irradiated through the first surface, a recorded information being reproduced based on changes in light intensity of the reflected light beam. The distance between the recording surface of the substrate and the light incident surface is smaller than a thickness of the substrate, and a surface roughness 'R' of the light incident surface meets a relationship represented by the following formula (1):R&#x2266;&#x3bb;/(8n) &#x2003;&#x2003;(1)

Information recording medium and method of manufacturing resinous substrate for use in the recording medium

An information recording medium comprising a substrate having a recording surface provided with emboss pits or guiding grooves, a reflective film formed on the recording surface of the substrate, and a first protective film formed on the reflective film. This information recording medium is featured in that both sides of the information recording medium are constituted by a first surface provided with the protective film and by a second surface formed opposite to the first surface, and that an irradiated light beam is irradiated through the first surface, a recorded information being reproduced based on changes in light intensity of the reflected light beam. The distance between the recording surface of the substrate and the light incident surface is smaller than a thickness of the substrate, and a surface roughness 'R' of the light incident surface meets a relationship represented by the following formula (1):R&#x2266;&#x3bb;/(8n)&#x2003;&#x2003;(1)

An information recording medium comprising a substrate having a recording surface provided with emboss pits or guiding grooves, a reflective film formed on the recording surface of the substrate, and a first protective film formed on the reflective film. This information recording medium is featured in that both sides of the information recording medium are constituted by a first surface provided with the protective film and by a second surface formed opposite to the first surface, and that an irradiated light beam is irradiated through the first surface, a recorded information being reproduced based on changes in light intensity of the reflected light beam. The distance between the recording surface of the substrate and the light incident surface is smaller than a thickness of the substrate, and a surface roughness 'R' of the light incident surface meets a relationship represented by the following formula (1):R&#x2266;&#x3bb;/(8n)&#x2003;&#x2003;(1)wherein &#x3bb; is a wavelength of the light beam, and n is a refractive index of the first protective film to a light having the wavelength &#x3bb;.

According to one embodiment, an information recording apparatus which records content compliant with a second DVD standard on an information storage medium, the second DVD standard being a DVD standard later than a first DVD standard defined for a first image quality and being defined for a second image quality higher than the first image quality, includes a determination unit configured to determine whether narrow burst cutting area (NBCA) of the information storage medium is valid or not, and whether supported maximum recording speed of the information storage medium is triple speed or more of a predetermined recording speed, and a recording unit configured to perform real-time recording of the content compliant with the second standard on the information storage medium on the basis of the determination.

Information recording apparatus, information recording method, information playback apparatus, and information playback method

A information recording medium on which stream information including images or sound and management information of the stream information are digitally recorded includes a first recording region in which first management information of the management information for use in common in management of each stream information divided every predetermined data amount can be recorded, and a second recording region in which a reference unit of information obtained by adding second management information of the management information for use in management of divided individual stream information to the divided stream information can be recorded.

Information recording medium, information recording apparatus, and information reproducing apparatus

In an optical disc in/from which data is recorded or reproduced by irradiating a storage area on the optical disc with a laser, information containing recording velocity information (RVI) for recording/reproduction, which represents a linear velocity different from the standard linear velocity, and write strategy information (WSI) corresponding to the recording velocity information is stored in a land pre-pit or the like on the optical disc.

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

Growing community of inventors

Chiba, Japan

Tadashi Kobayashi