Projection lens system
US5130850A · kind A · utility
17Cited by
3References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 13, 1990 |
| Grant date | Jul 14, 1992 |
| Priority date | — |
| Expiry date | Dec 13, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/16
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A projection lens system for use in a projection type display and for displaying an image formed on a face plate of a cathode ray tube on a screen. The projection lens system includes of eight lens components disposed at the optical axis. The second and seventh lenses from the image side, among the eight lens components essentially have somewhat weak optical power, and are made up of a plastic lens having aspheric surfaces on both sides.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.