Koichi Maruyama
139Patents
19h-index
101Co-inventors
89Inventor score
Filing activity: Nov 29, 1972 → Feb 9, 2021
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US8570668B2 | Imaging optical system and imaging apparatus | Physics | 118 | Active |
| US6118594A | Objective lens for optical pick-up | Physics | 81 | Expired |
| US6191889A | Objective lens for optical pick-up | Physics | 55 | Expired |
| US5838496A | Diffractive multi-focal objective lens | Physics | 50 | Expired |
| US5629799A | Chromatic aberration correcting element and its application | Physics | 47 | Expired |
| US5991102A | Beam protecting device | Physics | 35 | Expired |
| US5461513A | Image stabilizing apparatus | Physics | 29 | Expired |
| US5039211A | Zoom lens capable of image blur compensation | Physics | 28 | Expired |
| US5297114A | Magneto-optic recording/reproduction apparatus for minimizing variation in focusing error signals caused by variation in optical source wavelength | Physics | 27 | Expired |
| US4948233A | Beam shaping optical system | Physics | 25 | Expired |
| US5280387A | Image stabilizing apparatus | Physics | 25 | Expired |
| US4848883A | Telephoto zoom lens system having four lens groups | Physics | 24 | Expired |
| US5796520A | Chromatic aberration correcting element and its application | Physics | 23 | Expired |
| US5825555A | Beam projecting apparatus | Physics | 22 | Expired |
| US6807019B2 | Objective lens having diffractive structure for optical pick-up | Physics | 22 | Expired |
| US5121978A | Image blur compensating telephotographic lens | Physics | 21 | Expired |
| US6130785A | Eyepiece lens system | Physics | 20 | Expired |
| US5321550A | Optical system of optical information recording/reproducing apparatus | Physics | 19 | Expired |
| US6594222B2 | Objective lens for optical pick-up | Physics | 19 | Expired |
| US6760295B1 | Optical pick-up | Physics | 18 | Expired |
| US6344935B1 | Optical system of optical pick-up | Physics | 18 | Expired |
| US4142131A | Color picture tube | Electricity | 17 | Expired |
| US6101035A | Triplet lens system with diffractive lens features | Physics | 17 | Expired |
| US5173809A | Objective lens system of optical information recording/reproducing apparatus | Physics | 17 | Expired |
| US5278401A | Optical disc apparatus having five light receiving areas for detecting focus error and tracking error | Physics | 17 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.