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Yamada Katsuyuki, Narumi Shinya, Harigaya Makoto, Tani Katsuhiko, Iwata Noriyuki, Onagi Nobuaki, Ito Kazunori, Shibaguchi Takashi, Hibino Eiko, Yuzurihara Hajime, Ohkura Hiroko, Shimofuku Akira, Nakamura Yuki: Optical information recording medium, method of manufacturing the optical information recording medium, and method of and apparatus for recording/reproducing optical information. Ricoh, April 3, 2002: EP1193696-A2 (19 worldwide citation)

An optical information recording medium comprising a substrate having concentric circular guide groove stores information that indicates a maximum recording linear velocity Vh. A phase change type SbTe recording layer is formed on the substrate having such a composition and thickness that a dislocat ...


2
Narumi Shinya, Yamada Katsuyuki, Ito Kazunori, Yuzurihara Hajime, Onaki Nobuaki: Optical information recording medium and method and apparatus for the same. Ricoh, January 10, 2003: JP2003-006860 (18 worldwide citation)

PROBLEM TO BE SOLVED: To provide a good recording method in recording at different recording line speed.SOLUTION: In recording a 'zero' signal in which the signal width is nT (where T is a clock period of time), a continuous light beam having the power level of Pe is made. In recording a 'one' signa ...


3
Narumi Shinya, Kato Masanori, Yamada Katsuyuki: Optical information recording medium, recording condition deciding method, optical information recording device and information processor. Ricoh, February 12, 2004: JP2004-046966 (7 worldwide citation)

PROBLEM TO BE SOLVED: To attain information recording in the optional combination of an optical information recording medium and an optical information recording device having the same recording system, and to improve the compatibility or matching regarding the combination of the optical information ...


4
Yamada Katsuyuki, Narumi Shinya: Optical information recording medium. Ricoh, January 29, 2003: EP1280142-A1 (6 worldwide citation)

An optical information recording medium including a substrate, a light absorbing layer which is located overlying the substrate and in which marks are formed to store information and a light reflection layer located overlying the light absorbing layer including a crystal, wherein the optical informa ...


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Yamada Katsuyuki, Nakamura Yuki, Narumi Shinya, Kato Masaki: Optical recording medium and method for manufacturing the optical recording medium. Ricoh, September 10, 2003: EP1343155-A2 (5 worldwide citation)

An optical recording medium including a substrate (1) having guide groove thereon; a first protective layer (2) located overlying the substrate; a recording layer (3) located overlying the first protective layer (2); a second protective layer (4) located overlying the recording layer (3); a third pr ...


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Kibe Takeshi, Yamada Katsuyuki, Shinkai Masaru, Narumi Shinya, Shinotsuka Michiaki, Iwasa Hiroyuki: Optical recording medium, manufacturing method of the same, and sputtering target. Ricoh, November 23, 2005: EP1598818-A1 (4 worldwide citation)

An optical recording medium including a substrate (1), a bottom protective layer (2) located overlying the substrate (1), an optical recording layer (4) located overlying the bottom protective layer (2), a top protective layer (6) located overlying the optical recording layer (4), an intermediate la ...


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Nakamura Yuki, Narumi Shinya: Method and device for initializing optical disk. Ricoh, September 26, 2003: JP2003-272172 (4 worldwide citation)

PROBLEM TO BE SOLVED: To provide a device for initializing a phase change type optical disk that can reduce a time for initializing process so as to enhance the productivity of disks, uniformly initialize the disk so as to reduce unevenness of a reflective index, and enhance the recording characteri ...


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Yamada Katsuyuki, Narumi Shinya, Kato Masanori, Nakamura Yuki: Optical recording medium. Ricoh, July 14, 2005: JP2005-190642 (4 worldwide citation)

PROBLEM TO BE SOLVED: To provide an optical recording medium which exhibits high reliability with respect to the storage in high temperature and high humidity, can operate stably at high temperature, has good mechanical characteristics, can be produced with high productivity, and can be suitably use ...


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Narumi Shinya: Optical information recording medium, method for recording optical information and optical information recording device. Ricoh, September 13, 2002: JP2002-260226 (3 worldwide citation)

PROBLEM TO BE SOLVED: To make a recording with excellent signal characteristics in the case that a phase-variable optical information medium is used even when a multi- speed recording, a CAV recording and the like are made at different linear velocity.SOLUTION: When the values of pulse string-relati ...


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Hayashi Yoshitaka, Sasa Noboru, Fujii Toshishige, Fujiwara Masayuki, Narumi Shinya, Kato Masanori, Kibe Takeshi, Miura Yuji: Sputtering target, its manufacturing method, and write-once type optical recording medium. Ricoh, October 11, 2007: JP2007-261247 (3 worldwide citation)

PROBLEM TO BE SOLVED: To provide a sputtering target suitable for the realization of a write-once type optical recording medium achieving high-density recording having excellent recording properties such as a low jitter value, and also to provide a manufacturing method therefor, a high-density optic ...