Stereoscopic image projection apparatus and telecentric zoom lens
US5982538A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 1997 |
| Grant date | Nov 9, 1999 |
| Priority date | — |
| Expiry date | Apr 3, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N13/363
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A stereoscopic image projector has a light valve controlled by two image signals. The light valve produces a polarized raster image in which some rasters are modulated by the first image signal and other rasters by the second image signal. A polarization switch changes the polarization of rasters modulated by the second image signal, thereby creating a stereoscopic image, which is projected through a projection lens onto a screen, and viewed through polarizing eyeglasses. A color stereoscopic image is obtained by using three light valves and three polarization switches, one for each of the three primary colors, and combining their images for projection through a single projection lens. The projection lens is preferably a telecentric zoom lens consisting of three lens groups.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.