Issued Patents All Time
Showing 1–25 of 25 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6262964 | Disc player with objective lens arranged in a zigzag pattern | Hiroshi Yokota, Hiroyuki Hirano, Katsumi Ishii, Shinichi Naohara, Yoshifumi Tsukada +1 more | 2001-07-17 |
| 5953308 | Disc player with alternating ascending/descending guide devices | Hiroshi Yokota, Hiroyuki Hirano, Katsumi Ishii, Shinichi Naohara, Yoshifumi Tsukuda +1 more | 1999-09-14 |
| 5848049 | Disc player with parallel objective lenses | Hiroshi Yokota, Hiroyuki Hirano, Katsumi Ishii, Shinichi Naohara, Yoshifumi Tsukada +1 more | 1998-12-08 |
| 5677904 | Disc player | Hiroshi Yokota, Hiroyuki Hirano, Katsumi Ishii, Shinichi Naohara, Yoshifumi Tsukada +1 more | 1997-10-14 |
| 5671201 | Pulling-in circuit for PLL circuit, pulling-in method for PLL circuit, PLL circuit device and apparatus for reproducing optical disc | Hiroshi Yokota, Hiroyuki Hirano, Katsumi Ishii, Shinichi Naohara, Yoshifumi Tsukada +1 more | 1997-09-23 |
| 5646921 | Method and apparatus for reproducing information recorded on CLV disc type record medium | Hiroshi Yokota, Hiroyuki Hirano, Katsumi Ishii, Shinichi Naohara, Yoshifumi Tsukada +1 more | 1997-07-08 |
| 5619484 | Pulling-in circuit for PLL circuit, pulling-in method for PLL circuit, PLL circuit device and apparatus for reproducing optical disc | Hiroshi Yokota, Hiroyuki Hirano, Katsumi Ishii, Shinichi Naohara, Yoshifumi Tsukada +1 more | 1997-04-08 |
| 5463604 | Optical disc with data recorded at different rates on different zones and recording apparatus, and reproducing apparatus therefor | — | 1995-10-31 |
| 5034934 | Opto-magnetic disk unit with improved dynamic range characteristics and opto-magnetic disk therefor | Ikuya Kikuchi, Yoshihiro Utsumi | 1991-07-23 |
| 5025432 | Autochanger of writable discs including a non-volatile memory for storing most recent defect management information relating to the writable discs | — | 1991-06-18 |
| 5025431 | Autochanger of writable discs | — | 1991-06-18 |
| 5023876 | Method and apparatus for detecting finally recorded sector | Tsuneo Ishii | 1991-06-11 |
| 5021894 | Recorded data demodulation circuit | Keiji Kinpara | 1991-06-04 |
| 5001698 | Read-out information signal processing circuit in an optical recording and reproducing system | — | 1991-03-19 |
| 4935618 | Wide bandwidth photoelectric converting circuit | — | 1990-06-19 |
| 4929917 | Phase-locked loop circuit | Fumihiko Yokogawa | 1990-05-29 |
| 4679181 | Method for detecting an error in loading a recording disc | — | 1987-07-07 |
| 4637005 | Focus servo device of a system for reading out recorded information | Minoru Kosaka, Katsumi Kawamura | 1987-01-13 |
| 4636745 | Signal waveform equalizing circuitry | — | 1987-01-13 |
| 4611319 | Disc drive control system | — | 1986-09-09 |
| 4544837 | Focus servo control device for an optical system having an initial focus locking operation | Megumi Tanaka | 1985-10-01 |
| 4540897 | Digital modulation signal reading device | Saburo Takaoka, Fumihiko Yokogawa, Youichi Ogawa | 1985-09-10 |
| 4535306 | Phase-locked loop detecting circuit | Tadahiro Yamaguchi | 1985-08-13 |
| 4493068 | Pick-up point dislocation detecting device in recording a disc player | Hiroyuki Hirano | 1985-01-08 |
| 4486795 | Disc drive servo system | — | 1984-12-04 |