Lens unit for projector
US5867320A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 8, 1997 |
| Grant date | Feb 2, 1999 |
| Priority date | — |
| Expiry date | Aug 8, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/7441
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A lens unit, for a projector, includes a scrambler which converts light input from a lamp into a uniform light. An image lens unit is arranged on an optical path between the scrambler and a liquid crystal display (LCD) panel for generating an image. The image lens unit allows the light passing through the scrambler to be emitted to the entire surface of the LCD panel. A collimating lens is arranged on the optical path between the image lens and the LCD panel and is provided for converting the light passing through the image lens into a parallel beam. The image lens unit consists of a first image lens of a positive power and a second image lens of a positive power.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.