Issued Patents All Time
Showing 1–22 of 22 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5717506 | Image communication apparatus for communicating binary and multi-value color image data | Masakuni Yamamoto, Susumu Matsumura, Hiroaki Hoshi, Koyo Hasegawa, Eiji Yamaguchi +2 more | 1998-02-10 |
| 5668872 | Information processing method and system | Hideki Morishima, Susumu Matsumura, Hiroaki Hoshi, Koyo Hasegawa, Masakuni Yamamoto +2 more | 1997-09-16 |
| 5661701 | Optical pickup using split beams impinging on different photodetector areas | Kazuya Matsumoto, Tetsuro Kuwayama | 1997-08-26 |
| 5488598 | Optical pickup using split beams impinging on different photodetector areas | Kazuya Matsumoto, Tetsuro Kuwayama | 1996-01-30 |
| 5416755 | Optical pickup using split beams impinging on different photo-detector areas | Kazuya Matsumoto, Tetsuro Kuwayama | 1995-05-16 |
| 5233598 | Information recording medium having a plurality of information tracks arranged in a predetermined rectilinear direction | Hiroaki Hoshi | 1993-08-03 |
| 5070490 | Optical recording medium with tracking tracks extending beyond the recording layer and a method for detecting tracking signal from said medium | — | 1991-12-03 |
| 5051974 | Optical head device having a light splitter with a diffraction grating structure | Naosato Taniguchi, Tetsuro Kuwayama, Hiroaki Hoshi, Hiroshi Osawa, Koyo Hasegawa +1 more | 1991-09-24 |
| 5042020 | Information recording and/or reproducing apparatus with an optical medium sensor for providing automatic variation in light beam intensity in accordance with various recording medium | — | 1991-08-20 |
| 4982391 | Method and apparatus for accessing a desired track of a recording medium during a stopped state of recording or reproduction | Wataru Sakagami, Shigeyuki Taniwa, Hideki Hosoya | 1991-01-01 |
| 4916687 | Apparatus for mounting and rotating an optical card for recording and/or reproducing information | — | 1990-04-10 |
| 4812020 | Optical information recording and reproducing apparatus | — | 1989-03-14 |
| 4733065 | Optical head device with diffraction grating for separating a light beam incident on an optical recording medium from a light beam reflected therefrom | Hiroaki Hoshi, Naosato Taniguchi, Tetsuro Kuwayama, Hiroshi Osawa, Yasuo Nakamura | 1988-03-22 |
| 4654839 | Optical head | — | 1987-03-31 |
| 4642703 | Information recording-reproducing method and apparatus | — | 1987-02-10 |
| 4599714 | Photo-magnetic reproducing apparatus | — | 1986-07-08 |
| 4595290 | Device for measuring light incident on an optical system | Noriyuki Nose | 1986-06-17 |
| 4561032 | Magnetooptic reproducing device | Kazuya Matsumoto | 1985-12-24 |
| 4544269 | Device for measuring light incident on an optical system | Noriyuki Nose | 1985-10-01 |
| 4486096 | Device for measuring incident light | Noriyuki Nose | 1984-12-04 |
| 4436398 | Device for splitting part of light incident on an image forming optical system | Noriyuki Nose | 1984-03-13 |
| 4214249 | Recording member for laser beam and process for recording | Masanao Kasai, Hitoshi Hanadate, Yoshioki Hajimoto, Takashi Kitamura | 1980-07-22 |