Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4897828 | Optical pickup device | Hidehiro Kume, Yoshiyuki Matsumoto, Koji Mitsumori, Etsufumi Yamamoto, Hiroshi Oinoue | 1990-01-30 |
| 4893296 | Optical pickup device | Yoshiyuki Matsumoto, Hidehiro Kume, Koji Mitsumori, Etsufumi Yamamoto, Hiroshi Oinoue | 1990-01-09 |
| 4873429 | Optical pick-up head without pick-up of stray light | Hidehiro Kume, Yoshiyuki Matsumoto | 1989-10-10 |
| 4823331 | Focusing detection apparatus | Yoshiyuki Matsumoto, Hidehiro Kume | 1989-04-18 |
| 4794588 | Optical disk player | Tsutomu Toyoguchi, Ryoji Takamatsu | 1988-12-27 |
| 4772784 | Semiconductor laser apparatus for optical head | Yoshiyuki Matsumoto | 1988-09-20 |
| 4731777 | Optical disk player | Tsutomu Toyoguchi, Ryoji Takamatsu, Yoshiro Watanabe | 1988-03-15 |
| 4687296 | Optical pickup | Yasunori Terayama, Masashi Nakamura, Kazuhiko Fujiie | 1987-08-18 |