1
Miyagawa Naoyasu, Gotoh Yasuhiro: Optical information recording medium and optical information recording/reproducing apparatus.. Matsushita Electric, March 23, 1994: EP0588305-A2 (91 worldwide citation)

Both concave and convex portions formed spirally or concentrically on an optical information recording medium (40) are used as recording tracks (41, 61, 62), in which identification signals (80, 81, 82) including position information, etc. on the optical information recording medium and so on are re ...


2
Narumi Kenji, Nishiuchi Kenichi: Optical information recording medium and optical information recording method, optical information recording device. Matsushita Electric, June 11, 2003: EP1318509-A1 (80 worldwide citation)

An optical information recording medium according to the present invention includes a first information recording layer on which information is to be recorded by laser light; and a second information recording layer on which information is to be recorded by the laser light which has passed through t ...


3
Naoyasu Miyagawa, Yasuhiro Gotoh: Optical recording/reproducing medium and apparatus using land and groove encoded information signals and identification signals including position information. Matsushita Electric Industrial, Spencer Frank & Schneider, September 19, 1995: US05452284 (79 worldwide citation)

Both concave and convex portions formed spirally or concentrically on an optical information recording medium are used as recording tracks, in which identification signals including position information on the optical information recording medium and so on are recorded in advance, and information si ...


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Nagata Kenichi, Nishiuchi Kenichi, Yamada Noboru, Akahira Nobuo: Optical information recording medium, recording and reproducing method therefor and optical information recording and reproduction apparatus. Matsushita Electric, November 17, 1999: EP0957477-A2 (63 worldwide citation)

A multi-layer optical information recording medium has a first information layer (7) located at the incident side for a laser beam and another information layer (17) at the back thereof. Thus, it has a large capacity. A relationship that R1a R2c holds for the reflectances R1a and R1c of the informat ...


6
Maeda Takanori: Optical information recording medium.. Pioneer Electronic, December 30, 1992: EP0520619-A1 (63 worldwide citation)

An optical information recording medium (1) configured to prevent signal reproduction due to intermodulation as well as to ensure a compatibility between players that involve read lights with different wavelengths and improved data transfer rate with higher information recording density. The optical ...


7
Hiroki Iwata, Yutaka Murakami: Optical information recording medium. Pioneer Electronic Corporation, Pioneer Video Corporation, Sughrue Mion Zinn Macpeak & Seas, May 11, 1993: US05210738 (63 worldwide citation)

An optical information recording medium, such as an optical disk, includes a meandering guide groove being varied in period according to first additional information and in amplitude according to second additional information. The optical information recording medium enables recording a plurality of ...


8
Kenichi Nishiuchi, Ken ichi Nagata, Nobuo Akahira: Optical recording medium having two separate recording layers. Matsushita Electric Industrial, Merchant Gould Smith Edell Welter & Schmidt P A, June 9, 1998: US05764619 (61 worldwide citation)

In an optical information recording medium having at least two information layer, guide grooves for tracking or sample pits or information pits corresponding to information signals are formed on a surface of a first substrate. A first information layer formed by a thin film for reflecting a portion ...


9
Emiko Hamada, Yuji Arai, Yuaki Shin, Takashi Ishiguro: Optical information recording medium. Taiyo Yuden Company, Oblon Spivak McClelland Maier & Neustadt, July 10, 1990: US04940618 (60 worldwide citation)

An optical information recording medium of the type wherein recorded data signals are reproduced by scanning them with a laser beam. The medium comprises a ROM region where optically readable pits are already formed and an information recordable region where optically readable pits can be formed by ...


10
Yoshito Tsunoda, Takeshi Maeda, Yoshitada Oshida: Information reproducing apparatus with plural beam readout. Hitachi, Craig & Antonelli, April 18, 1978: US04085423 (58 worldwide citation)

Information reproducing apparatus for producing information on an optical information recording medium includes a first light source which gives forth a beam of light of a wavelength .lambda..sub.1 and a second light source which gives forth a beam of light of a wavelength .lambda..sub.2 different f ...



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