Viewfinder optics with zero power doublet
US4086000A · kind A · utility
21Cited by
1References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 23, 1976 |
| Grant date | Apr 25, 1978 |
| Priority date | — |
| Expiry date | Aug 23, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B23/14
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A chromatically neutral viewfinder optical system of positive forward and rearward elements and including therebetween a substantially zero power doublet which neutralizes chromatic errors generated by the positive elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.