Optical projection system with a varifocal projection lens
US5564811A · kind A · utility
11Cited by
8References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 30, 1994 |
| Grant date | Oct 15, 1996 |
| Priority date | — |
| Expiry date | Dec 30, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/7458
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical projection system capable of displaying an image of M.times.N pixels in various sizes, wherein M and N are integers, comprises an non-point light source, a collimating lens, a focussing lens, an optical baffle, an array of M.times.N actuated mirrors, and a varifocal projection system including a positive power lens and a negative powers lens separated by a distance, wherein the image in various sizes is provided by changing the distance between the positive and negative power lenses in the varifocal projection lens system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.