Wide field eyepiece lens system
US5227918A · kind A · utility
4Cited by
1References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 3, 1992 |
| Grant date | Jul 13, 1993 |
| Priority date | — |
| Expiry date | Apr 3, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B25/001
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An eyepiece lens system comprising, in the order from the side of incidence of rays, a first lens unit having positive or negative refractive power as a whole and a second lens unit having positive refractive power as a whole, said eyepiece lens system having little aberrations, image surface flatness excellent to the marginal portions of visual field, a high eye point and a wide visual field.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.