Optical pickup head having a hologram-associated objective lens and optical information processing apparatus using the same
US5111448A · kind A · utility
40Cited by
4References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 6, 1989 |
| Grant date | May 5, 1992 |
| Priority date | — |
| Expiry date | Aug 6, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0912
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical pickup head for performing recording, reproducing and erasing of information on an optical disc in an optical system employs an objective lens, which is integrated or combined with a holographic optical element, so that the focusing of a diffraction beam on a photo-sensor is stabilized irrespective of the movement of the objective lens due to the tracking control operation in the optical system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.