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Katsuyuki Yamada, Hiroko Iwasaki, Yukio Ide, Makoto Harigaya, Yoshiyuki Kageyama, Hiroshi Deguchi, Masaetsu Takahashi, Yoshitaka Hayashi: Sputtering target, method of producing the target, optical recording medium fabricated by using the sputtering target, and method of fabricating the optical recording medium. Ricoh Company, Cooper & Dunham, August 28, 2001: US06280684 (217 worldwide citation)

A sputtering target for fabricating a recording layer of a phase-change type optical recording medium contains a compound or mixture including as constituent elements Ag, In, Te and Sb with the respective atomic percent (atom. %) of &agr;, &bgr;, &ggr; and &dgr; thereof being in the relationship of ...


2
Yuki Nakamura, Katsuyuki Yamada, Eiji Noda, Ippei Ogawa: Phase-change information recording medium and optical recording method to make higher rotation rates feasible. Ricoh Company, Dickstein Shapiro Morin & Oshinsky, August 28, 2001: US06280810 (61 worldwide citation)

An information recording medium includes a substrate, a first protective layer formed on the substrate, a recording layer formed on the first protective layer, and a second protective layer formed on the recording layer. The first protective layer has a thickness in a range from 65 nm to 130 nm. The ...


3
Katsuyuki Yamada, Yuki Nakamura, Eiji Noda, Kyohji Hattori, Kenichi Aihara, Fumiya Ohmi, Yujiro Kaneko: Optical recording medium and recording and reproducing method using the same. Ricoh Company, Oblon Spivak McClelland Maier & Neustadt P C, October 26, 1999: US05974025 (43 worldwide citation)

An optical recording medium capable of recording and erasing information, includes a first dielectric layer, a recording layer, a second dielectric layer, a light reflection and heat dissipation layer, and an overcoat layer which are successively overlaid on a substrate, the recording layer includin ...


4
Yukio Ide, Hiroko Iwasaki, Yoshiyuki Kageyama, Yujiro Kaneko, Katsuyuki Yamada, Michiaki Shinotsuka, Makoto Harigaya, Hiroshi Deguchi: Sputtering target. Ricoh Company, Cooper & Dunham, April 7, 1998: US05736657 (37 worldwide citation)

A sputtering target contains a target material including as constituent elements Ag, In, Te and Sb with the respective atomic percents (atom. %) of .alpha., .beta., .gamma. and .delta. thereof being in the relationship of 0.5.ltoreq..alpha.<8, 5.ltoreq..beta..ltoreq.23, 17.ltoreq..gamma..ltoreq.38, ...


5
Kyohji Hattori, Fumiya Ohmi, Kenichi Aihara, Katsuyuki Yamada, Yuki Nakamura, Eiji Noda, Michihisa Takahashi, Yujiro Kaneko, Yukio Ide: Initialization of phase-change optical recording medium. Ricoh Company, Cooper & Dunham, September 3, 2002: US06445669 (33 worldwide citation)

A method of initializing a phase-change optical information recording medium is provided, using an optical system incorporating a semiconductor laser device. The laser device is characterized by a specified spatial power distribution. In a spatial distribution of the laser power focused on the recor ...


6
Yukio Ide, Makoto Harigaya, Katsuyuki Yamada, Hiroko Iwasaki: Information recording medium. Ricoh Company, Cooper & Dunham, March 31, 1992: US05100700 (32 worldwide citation)

An information recording medium comprising a substrate, and a recording layer formed thereon, which comprises as the main component a compound having the following formula:


7
Masaki Kato, Shinya Narumi, Katsuyuki Yamada: Method and device for recording optical data. Ricoh Company, Cooper & Dunham, July 11, 2006: US07075871 (29 worldwide citation)

There is provided a method and a device for recording optical data able to improve recording power setting during recording by means of PWM with a small number of pulses. During the test recording, using a period of a recording channel clock Tw as the minimum unit, marks having different mark length ...


8
Osamu Nonoyama, Yukio Ide, Makoto Harigaya, Yoshiyuki Kageyama, Hiroshi Deguchi, Katsuyuki Yamada, Masaetsu Takahashi, Hiroko Iwasaki: Recording and simultaneous verifying method of phase-changing type of information recording medium. Ricoh Company, Cooper & Dunham, July 8, 1997: US05646924 (29 worldwide citation)

An intensity of light reflected on a phase-changing type of information recording medium is changed since unrecorded and recorded portions of the recording medium have different phase states so that reflectivities of the unrecorded and recorded portions are different from each other. Such an intensi ...


9
Makoto Harigaya, Yukio Ide, Katsuyuki Yamada, Hiroko Iwasaki: Optical information recording medium. Ricoh Company, Oblon Spivak McClelland Maier & Neustadt, April 30, 1991: US05011723 (29 worldwide citation)

A phase-change type optical information recording medium is disclosed, which medium comprises a substrate and a recording layer formed thereon. The recording layer comprises a phase-transition type compound consisting of 4 to 6 elements, having a chalcopyrite structure, represented by the following ...


10
Katsuyuki Yamada, Narihito Kojima, Yukio Ide, Makoto Harigaya, Hiroko Iwasaki: Information recording medium. Ricoh Company, Cooper & Dunham, January 14, 1992: US05080947 (28 worldwide citation)

An information recording medium comprises a substrate and a recording film layer thereon comprising a hydrocarbon polymer and finely-divided particles of a metallic component dispersed therein, which recording film layer is a plasma polymerized film prepared by subjecting an organic metallic complex ...



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