All plastic projection lens assembly with aspheric surface
US4240701A · kind A · utility
10Cited by
8References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 12, 1978 |
| Grant date | Dec 23, 1980 |
| Priority date | — |
| Expiry date | Jun 12, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An all plastic lens assembly having a lens cell or housing and at least four separate airspaced lens elements mounted in the cell or housing, the lens elements are formed of plastic and at least one of the lens elements has an aspheric surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.