Issued Patents All Time
Showing 25 most recent of 39 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5568337 | Head positioning using a disk drive mounted to a rotating table | Tadashi Eguchi, Katsumi Momose, Hiroji Narumi, Kotaro Hosaka, Masaaki Tsukiji +1 more | 1996-10-22 |
| 5532819 | Rotary detector having an optical system for guiding two diffracted lights | Koh Ishizuka | 1996-07-02 |
| 5438586 | Apparatus with light-emitting element and method for producing it | Satoshi Ishii, Koh Ishizuka, Hiroshi Kondo | 1995-08-01 |
| 5436724 | Apparatus for measuring relative movement using a diffraction grating having an orthogonally polarized input beam | Koh Ishizuka | 1995-07-25 |
| 5404220 | Measuring method and measuring apparatus for determining the relative displacement of a diffraction grating with respect to a plurality of beams | Seiji Takeuchi, Minoru Yoshii, Hiroyasu Nose, Koh Ishizuka | 1995-04-04 |
| 5390022 | Displacement information detection apparatus for receiving a divergent light beam | Koh Ishizuka, Hiroshi Kondo, Yasushi Kaneda | 1995-02-14 |
| 5283434 | Displacement detecting device with integral optics | Koh Ishizuka, Yasushi Kaneda | 1994-02-01 |
| 5198873 | Encoder utilizing interference using multi-mode semiconductor laser | Ko Ishizuka, Yoichi Kubota, Masaaki Tsukiji, Satoshi Ishii | 1993-03-30 |
| 5159192 | Encoder and scanning system using a scale having a non-uniform pitch | Koh Ishizuka | 1992-10-27 |
| 5146085 | Encoder with high resolving power and accuracy | Koh Ishizuka | 1992-09-08 |
| 5129725 | Method of optically detecting position of object and position detecting apparatus using the method | Koh Ishizuka, Masaaki Tsukiji, Chikara Satoh, Satoshi Ishii | 1992-07-14 |
| 5126562 | Encoder for setting optical path lengths of related beams | Koh Ishizuka | 1992-06-30 |
| 5101102 | Rotary encoder having a plurality of beams emitted by a diffraction grating | Koh Ishizuka | 1992-03-31 |
| 5067813 | Optical apparatus for measuring displacement of an object | Kou Ishizuka, Masaaki Tsukiji, Satoshi Ishii | 1991-11-26 |
| 5067089 | Device having signal interpolation circuit and displacement measuring apparatus comprising the device | Satoshi Ishii, Masaaki Tsukiji, Koh Ishizuka | 1991-11-19 |
| 5066130 | Displacement measuring apparatus | Masaaki Tsukiji, Koh Ishizuka, Satoshi Ishii, Yoichi Kubota | 1991-11-19 |
| 5059791 | Reference position detecting device utilizing a plurality of photo-detectors and an encoder using the device | Koh Ishizuka, Osamu Kasahara | 1991-10-22 |
| 5051579 | Optical scale encoder with light intensity alarm | Masaaki Tsukiji, Koh Ishizuka, Satoshi Ishii | 1991-09-24 |
| 5038491 | Scale for use for measurement of the displacement of an object to be examined, and displacement measuring apparatus | Masaaki Tsukiji, Satoshi Ishii, Koh Ishizuka | 1991-08-13 |
| 5038032 | Encoder incorporating a displaceable diffraction grating | Yoichi Kubota, Satoshi Ishii, Koh Ishizuka, Masaaki Tsukiji | 1991-08-06 |
| 5036192 | Rotary encoder using reflected light | Koh Ishizuka, Osamu Kasahara | 1991-07-30 |
| 5026985 | Method and apparatus for detecting a reference position of a rotating scale with two sensors | Koh Ishizuka, Masaaki Tsukiji, Satoshi Ishii | 1991-06-25 |
| 5021649 | Relief diffraction grating encoder | Koh Ishizuka, Satoshi Ishii, Masaaki Tsukiji | 1991-06-04 |
| 5017777 | Diffracted beam encoder | Koh Ishizuka, Masaaki Tsukiji, Yoichi Kubota, Satoshi Ishii | 1991-05-21 |
| 5000542 | Optical type encoder | Masaaki Tsukiji, Satoshi Ishii, Koh Ishizuka, Yoichi Kubota | 1991-03-19 |