Retrofocus type wide-angle lens system
US4206975A · kind A · utility
4Cited by
3References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 21, 1978 |
| Grant date | Jun 10, 1980 |
| Priority date | — |
| Expiry date | Sep 21, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/04
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A retrofocus type wide-angle lens system for use in micro readers, micro printers, facsimiles, etc. comprising a first negative meniscus lens component, a second positive lens component, a third biconcave lens component, a fourth positive lens component, a fifth positive lens component and a sixth negative meniscus lens component. Said lens system assures high resolution even at marginal portions of image and has a high aperture efficiency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.