# US 2008/0304401 A1 · Information recording medium, information recording method, and information reproducing method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2008/0304401 A1 - Document ID: US20080304401A1 - Status: Published application - Kind: A1 - Application number: 11/969,732 - Filed: 2008-01-04 - Published: 2008-12-11 - Earliest claimed: 2007-01-16 - Assignees: Kabushiki Kaisha Toshiba - Inventors: Hideo Ando; Hisashi Yamada; Seiji Morita; Koji Takazawa; Naomasa Nakamura; Kazuo Watabe; Nobuaki Kaji; Masahiko Mawatari; Nobuhisa Yoshida; Koichi Nagai - Web page: https://patentgrep.com/patent/US20080304401A1 ## CPC - G11B 7/24079: Width or depth (G11B7/24076 takes precedence) - G11B 7/00736: {Auxiliary data, e.g. lead-in, lead-out, Power Calibration Area [PCA], Burst Cutting Area [BCA], control information (sector headers or adresses in prepits G11B7/00745; address data in track wobble G11B7/24082)} - G11B 7/00745: {Sectoring or header formats within a track (formats in general G11B20/12)} - G11B 20/00086: {Circuits for prevention of unauthorised reproduction or copying, e.g. piracy (indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00)} - G11B 20/0021: {involving encryption or decryption of contents recorded on or reproduced from a record carrier} - G11B 20/00224: {wherein the key is obtained from a remote server} - G11B 20/00253: {wherein the key is stored on the record carrier} - G11B 20/00449: {content scrambling system [CSS]} - G11B 20/00492: {wherein content or user data is encrypted} - G11B 20/00869: {wherein the remote server can deliver the content to a receiving device} - G11B 2220/215: Recordable discs - G11B 2220/2562: DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) ## Abstract According to one embodiment, an optical information recording medium includes pre-grooves with an irregular shape and lands each of which is sandwiched between the pre-grooves adjacent to each other, where the pre-grooves and lands are defined on an interface between a recording layer and a light reflection layer in a recording film, where the recording film includes a light reflectivity that enables reproduction with light of 650±5 nm, the recording layer includes a recording sensitivity with respect to light by a wavelength shorter than 650±5 nm, and a recording mark can be formed on the pre-groove by using light with a wavelength shorter than 650±5 nm. ## Claims ### Claim 1 An information storage medium comprising: a recording film comprising a recording layer and a light reflection layer; pre-grooves, and a plurality of lands, each of which is sandwiched between the pre-grooves and positioned adjacent to each other, the pre-grooves and the lands being forming on an interface between the recording layer and the light reflection layer, wherein the recording film includes a light reflectivity that enables reproduction with light of 650±5 nm, wherein the recording layer includes a recording sensitivity with respect to light with a wavelength shorter than 650±5 nm, and wherein a recording mark is configured to be formed on the pre-groove by using light of a wavelength shorter than 650±5 nm. ### Claim 2 (depends on 1) The information storage medium of claim 1, wherein the pre-groove depth is smaller than 650/(16·n650) nm, where n650 is a refractive index in the recording layer with respect to the light of 650±5 nm. ### Claim 3 A method of recording information in a storage medium, the method comprising applying a recording mark to a storage medium, wherein the storage medium comprises a recording film that comprises a recording layer and a light reflection layer; pre-grooves, and a plurality of lands each of which is sandwiched between the pre-grooves and positioned adjacent to each other, the pre-grooves and the lands being formed on an interface between the recording layer and the light reflection layer, wherein the recording film includes a light reflectivity that enables reproduction with light of 655±5 nm, wherein the recording layer has a recording sensitivity with respect to light with a wavelength shorter than 655±5 nm, and wherein the recording mark is configured formed on the pre-groove of the recording layer by using light of a wavelength shorter than 650±5 nm. ### Claim 4 (depends on 3) The method of claim 3, wherein the pre-groove depth is smaller than 650/(16·n650) nm, where n650 is a refractive index in the recording layer with respect to the light of 650±5 nm. ### Claim 5 A method of reproducing information from a storage medium, the storage medium comprising a recording film that comprises a recording layer and a light reflection layer, the storage medium further comprising pre-grooves and lands each of which lands is sandwiched between the pre-grooves adjacent to each other, the pre-grooves and the lands being formed on an interface between the recording layer and the light reflection layer, wherein the recording film includes a light reflectivity that enables reproduction with light of 650±5 nm, wherein the recording layer includes a recording sensitivity with respect to light by a wavelength shorter than 655±5 nm, a recording mark is formed on the pre-groove of the recording layer by using light with a wavelength shorter than 650±5 nm, the method comprising reproducing information recorded on the recording film by using the light of 650±5 nm. ### Claim 6 (depends on 5) The method of claim 5, wherein the pre-groove depth is smaller than 650/(16·n650) nm, where n650 is a refractive index in the recording layer with respect to the light of 650±5 nm.