1
Naoyasu Miyagawa, Yasuhiro Gotoh: Optical recording/reproducing apparatus for optical disks with various disk substrate thicknesses. Matsushita Electric Industrial, Stevens Davis Miller & Mosher, August 10, 1993: US05235581 (82 worldwide citation)

An optical disc apparatus for recording, reproducing or erasing an information signal by converging a light flux onto a recording layer through a transparent substrate. The apparatus includes one or a plurality of optical heads having a plurality of objective lenses whose aberrations have respective ...


2
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 ...


3
Eiji Ohno, Kenichi Nishiuchi, Yoshitaka Sakaue, Kazuhisa Ide, Naoyasu Miyagawa, Nobuo Akahira: Optical information recording medium. Matsushita Electric Industrial, Ratner & Prestia, April 28, 1998: US05745475 (40 worldwide citation)

An optical information recording medium includes: a substrate including a groove having a concave shape and a land having a convex shape adjacent to the groove; and a recording layer on the substrate, wherein the recording layer consists of a material which changes between a first state and a second ...


4
Naoyasu Miyagawa, Mamoru Shoji, Takashi Ishida, Shigeru Furumiya, Yuji Hisakado: Optical information recording/reproducing device and method for recording, reproducing and erasing information on an optical information recording medium utilizing light beam radiation. Matsushita Electric Industrial, Snell & Wilmer, March 28, 2000: US06044051 (37 worldwide citation)

There is provided an optical information recording/reproducing device for recording, reproducing, or erasing information on an optical information recording medium including information tracks formed on a disk substrate including alternating groove tracks and land tracks each including: a header reg ...


5
Naoyasu Miyagawa, Eiji Ohno, Kenichi Nishiuchi: Optical information recording media and optical information read/write device. Willian Brinks Hofer Gilson & Lione, September 5, 1995: US05448551 (24 worldwide citation)

Both guide grooves and lands of an optical information recording medium constitute information tracks, the depth of the guide groove being between approximately .lambda./8 and approximately .lambda./4.7 in optical length and the width of the guide groove being between 0.34R and R, where R represents ...


6
Naoyasu Miyagawa, Yasuhiro Gotoh: Optical recording medium permitting detection of identification signals in land areas and groove areas, optical information recording/reproducing apparatus and apparatus for producing an original disk for forming a disk substrate. Matsushita Electric Industrial, Spencer & Frank, April 1, 1997: US05616390 (23 worldwide citation)

An optical information recording medium is configured so that grooves and lands formed spirally or concentrically on a disk substrate are used as recording tracks. Identification signal areas are provided in which identification signals including positional information are formed in advance on the d ...


7
Naoyasu Miyagawa, Yasuhiro Gotoh: Optical disc apparatus with tracking error compensation. Matsushita Electric Industrial, Parkhurst Wendel & Rossi, December 12, 1995: US05475662 (18 worldwide citation)

An optical disc apparatus, which uses an optical disc having a signal recorded on both hollow and convex portions of tracks, provides stable tracking control. An offset judging circuit judges whether the signal has been recorded only on either of two recording regions adjacent in a vertical directio ...


8
Shinichi Kadowaki, Yoshiaki Komma, Naoyasu Miyagawa: Optical pickup head wherein an error signal is produced by detecting a phase difference in diffraction beams from a holographic optical element. Matsushita Electric Industrial, Lowe Price LeBlanc & Becker, March 8, 1994: US05293367 (16 worldwide citation)

A light source emits a light beam which is focused on an optical recording medium. The light beam is reflected and diffracted by the optical recording medium. A holographic optical element has divided regions formed with different holographic patterns. The divided regions of the holographic optical ...


9
Naoyasu Miyagawa, Takashi Ishida, Junichi Minamino, Kenji Koishi, Shigeru Furumiya: Optical information recording/reproducing method and optical information recording/reproducing apparatus. Matsushita Electric Industrial, Wenderoth Lind & Ponack L, January 21, 2003: US06510116 (15 worldwide citation)

When data is reproduced by an apparatus which is different from an apparatus used for recording the data, the fluctuation of edge positions of the reproducing data increases, making reproduction incompatible, and the present invention solves this problem. The present invention comprises reproducing ...


10
Naoyasu Miyagawa, Yasuhiro Gotoh: Optical information recording medium offset pre-pit array indicating identification information. Matsushita Electric Industrial, Renner Otto Boisselle Sklar, September 12, 2000: US06118752 (12 worldwide citation)

An optical information recording medium according to the present invention includes at least one groove track and at least one land track allowing information to be recorded on or reproduced from the groove track and the land track, the groove track and the land track adjoining each other. The optic ...