Nobuo Ogata
32Patents
11h-index
33Co-inventors
75Inventor score
Filing activity: Nov 10, 1986 → Nov 9, 2010
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5085496A | Optical element and optical pickup device comprising it | Physics | 163 | Expired |
| US5940364A | Optical disk including wobbled guiding groove composed of pits, optical disk manufacturing apparatus, and optical disk recording/reproducing apparatus | Physics | 56 | Expired |
| US5189655A | Optical head for optical disk recording/reproducing apparatus including modified Wollaston prism | Physics | 28 | Expired |
| US5673247A | Optical pickup having two objective lenses | Physics | 19 | Expired |
| US5446721A | Objective lens drive device with support system | Physics | 19 | Expired |
| US6407968B1 | Optical information recording/reproducing apparatus having focus error signal compensation | Physics | 19 | Expired |
| US5999502A | Optical information recording/reproducing apparatus having focus servo control compensation for lands and grooves | Physics | 13 | Expired |
| US5050155A | Pick-up device for use in an optical information recording system utilizing a diffraction grating with blaze characteristics | Physics | 13 | Expired |
| US4812638A | Focusing error detector and optical data detecting device incorporating the focusing error detector | Physics | 12 | Expired |
| US5696742A | Optical disk device for reproducing address information from wobbled groove | Physics | 11 | Expired |
| US7260047B2 | Optical pickup that uses light sources with different wavelengths for each of multiple recording mediums | Physics | 11 | Expired |
| US6392970B1 | Reproducing light quantity control method for optical memory device, and reproducing light quantity control device, and optical recording medium | Physics | 11 | Expired |
| US5428595A | Optical information recording and reproducing device | Physics | 9 | Expired |
| US4985880A | Optical information recording and reproducing apparatus | Physics | 8 | Expired |
| US6614720B1 | Optical pickup device | Physics | 7 | Expired |
| US5442616A | Light source unit and method of adjusting for maximizing focus and tracking errors thereby | Physics | 6 | Expired |
| US5659528A | Information recording-reproduction method | Physics | 6 | Expired |
| US9158151B2 | Surface light-emitting unit and display device provided with the same | Electricity | 5 | Active |
| US7239603B1 | Recording medium with judging area for track area identification based on wobbling polarity | Physics | 4 | Expired |
| US5737297A | Optical head | Physics | 3 | Expired |
| US7075865B2 | Optical pickup | Physics | 3 | Expired |
| US6930976B2 | Optical recording medium and optical pickup device | Physics | 2 | Expired |
| US4849825A | Pick-up device for use in an optical information recording system | Physics | 2 | Expired |
| US5774428A | Method and apparatus for magneto-optical recording or reproducing using modulated magnetic field | Physics | 1 | Expired |
| US8297784B2 | Surface-emission unit and method for producing the same | Electricity | 1 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.