Beam spot control device using a thin micro lens with an actuator
US4775967A · kind A · utility
44Cited by
5References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 11, 1985 |
| Grant date | Oct 4, 1988 |
| Priority date | — |
| Expiry date | Oct 11, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0909
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In the present invention, a micro Fresnel lens in the shape of a thin film is used. A lens driving member constructed of piezoelectric transducers or of magnets and coils is disposed around the lens. The focus of the lens is adjusted by controlling applied voltages to the piezoelectric transducers or the coils.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.