Photographic lens system having a large aperture ratio
US4106854A · kind A · utility
10Cited by
2References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 5, 1977 |
| Grant date | Aug 15, 1978 |
| Priority date | — |
| Expiry date | Apr 5, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B9/60
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A gauss type photographic lens system having a large aperture ratio which comprises five components of six lens elements and wherein symmetry of coma is improved and curvature of field, spherical aberration, etc., are favorably corrected by enlarging the airspace comprising a stop and increasing refractive indices of the lens elements arranged on both the sides of said stop.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.