1
Isao Kobayashi, Yosuke Hamada, Kenji Mori, Hiromu Hirai: Sample moving apparatus, sample moving system and semiconductor manufacturing apparatus. Hitachi, Antonelli Terry Stout & Kraus, December 17, 1991: US05073912 (44 worldwide citation)

A sample moving apparatus for positioning wafers with high accuracy, which apparatus comprises a fine adjustment actuator having a drive stroke to finely move the wafer, a fine adjustment stage driven by the fine adjustment actuator, a coarse adjustment actuator having a drive stroke to relatively c ...


2
Yosuke Hamada, Haruaki Otsuki, Yuji Hata, Shigeyoshi Saito: Method and apparatus for eliminating external disturbances in a disk drive device. Hitachi, Antonelli Terry Stout & Kraus, March 28, 1995: US05402400 (29 worldwide citation)

A disk storage device comprises a microcomputer for estimating an external disturbance compensation signal and storing it and a first adder for adding the external disturbance compensation signal as a feedforward signal to a positioning compensation signal to a drive circuit. Where a positioning com ...


3
Takashi Yamaguchi, Katsuhiro Tsuneta, Katsumoto Onoyama, Tsuyoshi Arai, Yoshikatsu Fujii, Hidehiko Numasato, Yosuke Hamada, Masahito Kobayashi: Magnetic disk apparatus having an accelerometer for detecting acceleration in the positioning direction of the magnetic head. Hitachi, Mattingly Stanger & Malur P C, June 18, 2002: US06407876 (24 worldwide citation)

A sector servo type magnetic disk apparatus is provided with, in addition to servo signals, a sensor such as an accelerometer for detecting a state of a magnetic head or a support for the magnetic head at a period shorter than a sampling period of the servo signals. Since an accelerometer mounted on ...


4
Jiro Abe, Yosuke Hamada: Magnetic disk drive and voice coil motor drive circuit. Hitachi, Antonelli Terry Stout & Kraus, August 26, 2003: US06611118 (19 worldwide citation)

A magnetic disk drive uses a back electromotive force sensor that detects the back electromotive force produced in a VCM actuator without being affected by fast changes of current during a high-speed control sampling cycle, and that enables configuration of a fast, high-band speed control system. A ...


5
Takashi Yamaguchi, Katsuhiro Tsuneta, Katsumoto Onoyama, Tsuyoshi Arai, Yoshikatsu Fujii, Hidehiko Numasato, Yosuke Hamada, Masahito Kobayashi: Apparatus for positioning magnetic head and method of the same. Hitachi, Beall Law Offices, November 16, 1999: US05986845 (9 worldwide citation)

An apparatus for positioning a magnetic head includes a servo signal detection circuit for detecting a servo signal recorded on a magnetic disk in a predetermined first period, an acceleration measuring portion which is fitted to a part of a mechanism for mounting a magnetic head, outputs an acceler ...


6
Jiro Abe, Yosuke Hamada: Magnetic disk drive and voice coil motor drive circuit. Hitachi, Antonelli Terry Stout & Kraus, March 8, 2005: US06864656 (9 worldwide citation)

A magnetic disk drive that drives and positions an actuator using a voice coil motor, includes a current sensing resistor connected in series to a terminal on current input side of the voice coil motor, a first operational amplifier and a second operational amplifier. The magnetic disk drive further ...


7
Takashi Yamaguchi, Katsuhiro Tsuneta, Katsumoto Onoyama, Tsuyoshi Arai, Yoshikatsu Fujii, Hidehiko Numasato, Yosuke Hamada, Masahito Kobayashi: Magnetic disk apparatus having an accelerometer for detecting acceleration in the positioning direction of the magnetic head. Hitachi, Mattingly Stanger & Malur P C, January 1, 2002: US06335845 (6 worldwide citation)

A sector servo type magnetic disk apparatus is provided with, in addition to servo signals, a sensor such as an accelerometer for detecting a state of a magnetic head or a support for the magnetic head at a period shorter than a sampling period of the servo signals. Since an accelerometer mounted on ...


8
Kyo Akagi, Yoshihiro Shiroishi, Reijiro Tsuchiya, Takehiko Hamaguchi, Masuo Umemoto, Mikio Suzuki, Takashi Kawabe, Katsuro Watanabe, Kiyoshi Matsumoto, Atsushi Saito, Kouichirou Wakabayashi, Yosuke Hamada: Magnetic recorder and magnetooptical recorder. Hitachi, Kenyon & Kenyon, October 10, 2000: US06130797 (6 worldwide citation)

Virtual tracks are set so that the rotation center of a magnetic recording medium or the vicinity of the rotation center coincides with the track center of the data information, and positioning servo control is performed. Thus, since it is not necessary to faithfully follow the track center line spe ...


9
Yosuke Hamada, Iwao Oshimi, Jiro Abe, Kiyotada Ito, Shinsuke Nakagawa: Disk storage device and head positioning method. Hitachi, Antonelli Terry Stout & Kraus, May 18, 2004: US06738218 (6 worldwide citation)

Settling response characteristics after change-over from a speed controller to a position controller is attained. Fluctuations in a time taken until change-over is made from the speed controller to the position controller are reduced to stabilize a moving time and to shorten an access time. To this ...


10
Yosuke Hamada, Kazuyuki Date: Disk storage device. Hitachi Global Storage Technologies Japan, Townsend and Townsend and Crew, January 24, 2006: US06989957 (3 worldwide citation)

A disk drive comprises a controller (70) that calculates a drive signal for positioning a head at a desired track on the basis of a desired track-position signal and a measured head-position signal, and a drive circuit for driving a voice-coil motor. The drive circuit includes a current feedback amp ...