1
Atsushi Saito, Takeshi Maeda, Takeshi Nakao, Kiyoshi Matsumoto, Atsushi Saito, Hiroyuki Minemura, Tetsuya Fushimi: Data recording/reproducing method and apparatus using a recording medium having clock marks recorded in a wobbled track for read/write synchronization. Hitachi, Fay Sharpe Beall Fagan Minnich & McKee, December 27, 1994: US05377178 (114 worldwide citation)

A data recording/reproduction method and apparatus uses an optical disk equipped with wobbling track guide grooves disposed in a track scanning direction and minutely wobbled. The apparatus uses a circuit for detecting and correcting displacement of an optical spot position from the wobbling track, ...


2
Harukazu Miyamoto, Yoshio Suzuki, Motoyuki Suzuki, Hisataka Sugiyama, Hiroyuki Minemura, Tetsuya Fushimi, Nobuhiro Tokushuku: Optical reproducing method. Hitachi, Antonelli Terry Stout & Kraus, April 15, 2003: US06549497 (83 worldwide citation)

An optical reproducing method for an optical medium including a disk-like substrate having a groove structure along tracks divided into a plurality of units. Each of the units includes a dropout portion of the groove structure along the track which is a non-groove portion. The groove structure is wo ...


3
Harukazu Miyamoto, Yoshio Suzuki, Motoyuki Suzuki, Hisataka Sugiyama, Hiroyuki Minemura, Tetsuya Fushimi, Nobuhiro Tokushuku: Information recording medium and method and apparatus for recording and reproducing information using the same. Hitachi, Antonelli Terry Stout & Kraus, August 10, 1999: US05936933 (50 worldwide citation)

A disk-like information recording medium includes recording areas provided in both of a groove portion and a land portion. The information recording medium is divided into groups of a plurality of areas, each track is divided into circular arc-shaped sectors having the same central angle arranged to ...


4
Takeshi Shimano, Masayuki Inoue, Akira Arimoto, Hiroyuki Minemura, Hisao Fujita, Hideaki Koyanagi: Object lens and optical head for reproducing data from optical disks in different thickness of substrate. Hitachi, Hoya Corporation, Fay Sharpe Beall Fagan Minnich & McKee, March 30, 1999: US05889748 (44 worldwide citation)

The objective lens has a numerical aperture NA=0.6 when reproducing a DVD having a thickness of 0.6 mm and NA=0.42 when reproducing a CD having a thickness of 1.2 mm. At a boundary of NA 0.42, a slight stepped portion is formed so as to establish a phase difference. In this case, a designed waveleng ...


5
Takeshi Maeda, Hirofumi Sukeda, Hiroyuki Minemura, Hidehiko Kando, Makoto Miyamoto: Recording a mark with the rising and falling edges varied based on previously recorded control data. Hitachi, Antonelli Terry Stout & Kraus, December 12, 2000: US06160784 (43 worldwide citation)

Optimum edge recording methods are previously held in a control data zone on the recording medium, and one of the methods is selected in a write mode by referring to the recorded methods. An information recording apparatus for forming a recording mark by converting an energy beam to a multi-pulsed t ...


6
Hiroyuki Minemura, Tetsuya Fushimi: Phase changing recording medium with amorphous points each formed by a pair of high power and low recording pulses. Hitachi, Fay Sharpe Beall Fagan Minnich & McKee, March 4, 1997: US05608710 (42 worldwide citation)

A spatially-independent N amorphous point train is formed by pulse width modulation of a laser to record information in a sample-servo optical disk drive used for a personal computer. Amorphous points are each formed by a pair of a high-power recording pulse WH and a lower power recording pulse WL f ...


7
Satoshi Shimada, Shinji Ohyama, Manabu Sato, Masahiko Ibamoto, Yoshio Sato, Nobuyoshi Tsuboi, Norifumi Miyamoto, Hiroyuki Minemura, Hiroaki Koyanagi: Intergrated optical head with flexible substrate portion. Hitachi, Kenyon & Kenyon, June 26, 1990: US04937808 (36 worldwide citation)

An optical head including a substrate, an optical waveguide formed on the substrate, a light source formed on a portion of the substrate, a collimator lens for converting light from the light source into parallel light rays, an objective lens for focusing light from the collimator lens onto a record ...


8
Hideki Nihei, Nobuyoshi Tsuboi, Hiroyuki Minemura, Hiroshi Kimura, Shigeki Morinaga: High-speed two-dimensional electrostatic actuator. Hitachi, Antonelli Terry Stout & Kraus, October 8, 1991: US05055731 (34 worldwide citation)

An electrostatic actuator includes a stationary element and a movable element. The stationary element has a surface which faces a surface of the moving element. Both the surface of the stationary element and the surface of the moving element have electrode lines disposed thereon, including a first s ...


9
Harukazu Miyamoto, Hiroyuki Minemura, Hisataka Sugiyama: Optical disk having wobbled information shared between tracks. Hitachi, Antonelli Terry Stout & Kraus, September 8, 1998: US05805565 (30 worldwide citation)

In an optical disk recording medium having grooves and lands formed on a substrate and information recording areas formed in association with both the groove and the land, prepits are disposed on a virtual extension of the boundary between a groove and a land, the prepits being disposed to satisfy s ...


10
Hiroyuki Minemura, Yoshio Sato, Nobuyoshi Tsuboi, Hiroaki Koyanagi, Shinji Ohyama: Optical element, optical disc and rotary encoder with the optical element. Hitachi, Antonelli Terry Stout & Kraus, December 18, 1990: US04978187 (27 worldwide citation)

A waveguide path type optical pickup is provided for preventing a returning light from returning back to a light source. A filter for selectively allowing either Te polarized light or TM polarized light to pass through the filter is provided in an optical path from a light source to an optical path ...



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