Issued Patents All Time
Showing 26–50 of 51 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6983383 | Method for providing priority to an ac adaptor if the input to the ac adaptor is above a predetermined value even if the power supply via an interface is present | Shuko Saito, Shigeyoshi Tanaka, Satoshi Furuta | 2006-01-03 |
| 6331966 | Optical storage apparatus and recording and reproducing method of optical storage medium | Yoshiyuki Nanba | 2001-12-18 |
| 6292444 | Optical storage device made thinner by substituting electrical means for capabilities of sensors | Toru Ikeda, Masateru Sasaki, Nobuhiko Isato, Shigeru Arai | 2001-09-18 |
| 5990106 | Bicyclic amino group-substituted pyridonecarboxylic acid derivatives, esters thereof and salts thereof, and bicyclic amines useful as intermediates thereof | Masato Sakamoto, Katsumi Chiba, Yukio Tominaga | 1999-11-23 |
| 5978330 | Optical storage device made thinner by substituting electrical means for capabilities of sensors | Toru Ikeda, Masateru Sasaki, Nobuhiko Isato, Shigeru Arai, Takayuki Kawabe | 1999-11-02 |
| 5970032 | Focus control method, and optical disk unit with focus offset correction | Toru Ikeda | 1999-10-19 |
| 5930212 | Positioning control system including a servo-error signal generating circuit | Shigeyoshi Tanaka, Michio Matsuura, Hiromichi Kuwano, Kazuyuki Tamanoi | 1999-07-27 |
| 5909415 | Positioning control system which generates a servo-error signal in accordance with a difference between detection currents | Shigeyoshi Tanaka, Michio Matsuura, Hiromichi Kuwano, Kazuyuki Tamanoi | 1999-06-01 |
| 5812503 | Positioning control system having an optical beam and a servo-error signal generating circuit for accurately irradiating a desired position | Shigeyoshi Tanaka, Michio Matsuura, Hiromichi Kuwano, Kazuyuki Tamanoi | 1998-09-22 |
| 5636191 | Positioning control system utilizing optical beam having servo-error signal generating circuit | Shigeyoshi Tanaka, Michio Matsuura, Hiromichi Kuwano, Kazuyuki Tamanoi | 1997-06-03 |
| 5631890 | Light modulation method for optical disk drive device | Toru Ikeda, Shigenori Yanagi | 1997-05-20 |
| 5631817 | Load current control of pulse width modulated drive signal including calibration and correction coefficient | — | 1997-05-20 |
| 5566143 | Positioning control system utilizing optical beam | Shigeyoshi Tanaka, Michio Matsuura, Hiromichi Kuwano, Kazuyuki Tamanoi | 1996-10-15 |
| 5495458 | Optical disk apparatus for detecting error readings of a track address in MCAV format | Toru Ikeda, Shigenori Yanagi | 1996-02-27 |
| 5289447 | Track cross signal generation circuit of optical disk device for correctly outputting track cross signal and correctly and stably carrying out seek operation even within high-speed region of beam | Shigeko Kobayashi, Shigenori Yanagi | 1994-02-22 |
| 5276671 | Control apparatus of laser diode | Shigeyoshi Tanaka | 1994-01-04 |
| 5197059 | Laser diode current supply including a threshold current component subject to automatic power control | Masateru Sasaki | 1993-03-23 |
| 5175722 | Power supply circuit for stabilizing power input to a laser diode | Shigenori Yanagi | 1992-12-29 |
| 5142520 | System for obtaining optimum focusing position in optical disc system | Shigenori Yanagi, Masateru Sasaki, Shigeru Arai, Toshitaka Iwamoto, Hidenori Saitoh | 1992-08-25 |
| 5077719 | Optical disk access system | Shigenori Yanagi, Masateru Sasaki, Toshitaka Iwamoto, Shigeyoshi Tanaka | 1991-12-31 |
| 4977551 | Optical disk tracking control system and method having normalized tracking error control signal | Shigeyoshi Tanaka | 1990-12-11 |
| 4785443 | Light control circuit of optical disc system | Akio Futamata | 1988-11-15 |
| 4707648 | Focus servomechanism control system of optical disc system having offset setting means | — | 1987-11-17 |
| 4627040 | Optical disk tracking apparatus | Shigeru Arai, Itaru Shibata, Koichi Ogawa | 1986-12-02 |
| 4611409 | Liquid removing method | Sho Nakao, Takao Nakayama | 1986-09-16 |