Issued Patents All Time
Showing 26–50 of 69 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6697398 | Laser light intensity controller | Fumihiko Sano | 2004-02-24 |
| 6577565 | Optical pickup for performing recording or reading operation on recording medium having prepits | Masayoshi Yoshida, Yoshitaka Shimoda | 2003-06-10 |
| 6577581 | Variable recording layer disk image pickup device | — | 2003-06-10 |
| 6567354 | Optical pickup device minimizing an undesirable astigmatism | — | 2003-05-20 |
| 6442115 | Information recording apparatus | Yoshitaka Shimoda, Masayoshi Yoshida | 2002-08-27 |
| 6363038 | Optical pickup device minimizing an undesirable astigmatism | — | 2002-03-26 |
| 6346695 | Optical pickup device | Takahiro Togashi, Shinichi Nagahara | 2002-02-12 |
| 6339581 | Disc player having a prepit detecting circuit | Masayoshi Yoshida, Yoshitaka Shimoda, Shinichi Nagahara | 2002-01-15 |
| 6327237 | Optical pickup for recording or reproducing system | Eiji Muramatsu | 2001-12-04 |
| 6317400 | Optical pickup apparatus | Shinichi Nagahara | 2001-11-13 |
| 6266313 | Optical pickup for recording or reproducing system | Eiji Muramatsu | 2001-07-24 |
| 6246660 | Device for controlling the power of a recording optical beam in an information storage apparatus | — | 2001-06-12 |
| 6160768 | Floating optical pickup and information recording and reproducing apparatus including the same | — | 2000-12-12 |
| 6088310 | Pickup for an optical system including a blazed hologram for dividing a laser | — | 2000-07-11 |
| 6075759 | Optical information recording and reproducing apparatus | Fumihiko Sano, Hiroshi Suzuki, Shinji Suzuki, Yasumitsu Suzuki, Masanori Nakahara | 2000-06-13 |
| 5982733 | Optical head | Fumihiko Sano | 1999-11-09 |
| 5894460 | Magneto-optical card recording apparatus employing an initialization magnet and a recording magnet | Fumihiko Sano, Hiroshi Suzuki, Shinji Suzuki, Yasumitsu Suzuki, Masanori Nakahara | 1999-04-13 |
| 5764610 | Optical disk type identification system using a frequency detector | Masayoshi Yoshida | 1998-06-09 |
| 5748600 | Rotational optical head for optical recording medium | Manabu Sugano, Susumu Nomura, Hiroshi Suzuki | 1998-05-05 |
| 5726961 | Optical pickup control system for optical discs having different reflectivities | — | 1998-03-10 |
| 5673245 | Rotary optical system for guiding and converging divided light beams to a tape recording medium | Susumu Nomura, Fumihiko Sano | 1997-09-30 |
| 5610883 | Optical pickup apparatus having means to eliminate crosstalk in a focus error signal | — | 1997-03-11 |
| 5555538 | Optical pickup | Fumihiko Sano | 1996-09-10 |
| 5550799 | Device for and method of calibrating optimum recording power for recordable optical disc recording apparatus | Akiyoshi Inoue, Shoji Taniguchi, Eisaku Kawano, Hiroshi Suzuki | 1996-08-27 |
| 5539721 | Reducing the recording power based on the timing of recorded synchronization signal | Shinichi Okada | 1996-07-23 |