1
Takashi Masaki, Shigenori Yanagi, Shigeru Arai: Optical storage drive controller with predetermined light source drive values stored in non-volatile memory. Fujitsu, Greer Burns & Crain, February 21, 1995: US05392273 (76 worldwide citation)

A control method and controller for an optical storage drive including: an optical head having a laser light source for applying light to an optical disk and a detector for receiving reflected light from the optical disk; and a seek mechanism for positioning the optical head on the optical disk. The ...


2
Shigenori Yanagi, Masateru Sasaki, Akira Minami, Toshitaka Iwamoto, Shigeyoshi Tanaka: Optical disk access system. Fujitsu, Staas & Halsey, December 31, 1991: US05077719 (41 worldwide citation)

An optical disk access system capable of varying the focus position of a beam spot illuminating the optical disk. The focus position of the beam spot is varied in accordance with a mode of operation of the optical disk system. The various focus positions are automatically selected by the optical dis ...


3
Shinya Kobayashi, Shigenori Yanagi, Teruji Yamakawa, Kiyomi Imamura: Optical storing apparatus and reproducing method for correcting read errors. Fujitsu, Greer Burns & Crain, February 3, 2004: US06687194 (34 worldwide citation)

A read retry of an MSR medium is executed while changing a setting of a reproducing magnetic field. Parameter set values of a successful read retry are stored as statistic information. When changes of the set values for defaults increase, the defaults are updated. The parameter set information of a ...


4
Satoshi Yamashita, Shunji Saitou, Yukio Abe, Shigenori Yanagi: Storage device, control method, control device, and program. Toshiba Storage Device Corporation, Greer Burns & Crain, November 16, 2010: US07835104 (33 worldwide citation)

A heater for changing a projection distance protrusion value by thermal expansion accompanying electric-power-distributed heating is provided in a head having at least a reading element. At desired correction timing, a changed distance detection unit measures a clearance changed distance in a state ...


5
Shigenori Yanagi: Optical disk device eliminating offset of actuator and offset eliminating method used thereby. Fujitsu, Staas & Halsey, February 23, 1993: US05189653 (28 worldwide citation)

An optical disk device for eliminating an offset of an actuator which controls a fine adjustment of a tracking control. In the device, during an offset measuring mode, an electric drive current of the actuator is changed and the drive current is stored and held when a detection output at a neutral p ...


6
Tomonori Yamashita, Shigenori Yanagi: Optical storage apparatus having track seek control unit providing improved seek performance. Fujitsu, Greer Burns & Crain, August 3, 1999: US05933397 (25 worldwide citation)

When an access of a 1-track seek is instructed from an upper apparatus, a 1-track seek period is divided into a predetermined accelerating period and decelerating period. A decelerating current is determined in accordance with a difference between sample points before and after a zero-cross point of ...


7
Toru Ikeda, Shigenori Yanagi: Disk storage apparatus including a single power supply hysteresis comparator having a symmetrical characteristic. Fujitsu, Greer Burns & Crain, September 27, 1994: US05351222 (25 worldwide citation)

A rectangular wave generator includes a comparator having a first input terminal receiving an input signal, a second input terminal, and an output terminal. The comparator slices the input signal at a hysteresis voltage so that a rectangular wave is output via the output terminal. The generator also ...


8
Hiroshi Kumita, Shigenori Yanagi, Yoshiyuki Nanba: High power controlling system for magneto-optical storage system. Fujitsu, Greer Burns & Crain, March 12, 2002: US06356515 (25 worldwide citation)

An optical storage medium processing method where a high power process is conducted upon the power adjusting area of the optical storage medium (which is used to perform optical beam power adjustment) by repeatedly conducting information recording by repeatedly radiating the optical beam at a power ...


9
Shigenori Yanagi: Optical disk apparatus using transition control between positioner seek control and lens seek control. Fujitsu, Staas & Halsey, August 31, 1993: US05241522 (24 worldwide citation)

An optical disk apparatus with an optical disk having tracks, an optical head having an object lens, a positioner to move the optical head along the optical disk, a tracking actuator to move the object lens, a tachometer to detect the velocity of the positioner, and a seek operation controller. The ...


10
Takashi Masaki, Shigenori Yanagi: Optical storage apparatus. Fujitsu, Greer Burns & Crain, September 5, 2000: US06115338 (23 worldwide citation)

A light emission adjustment processing unit of a laser diode sequentially instructs a D/A converter for light emission of a light emission by test powers at predetermined two points, allows the laser diode to emit the light, instructs a D/A converter for subtraction of subtraction currents correspon ...