Viewfinder optical system
US6052234A · kind A · utility
10Cited by
8References
34Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 16, 1997 |
| Grant date | Apr 18, 2000 |
| Priority date | — |
| Expiry date | Apr 16, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B23/14
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A viewfinder optical system has a relay lens system. The relay lens system focuses a primary image to form a secondary image. The relay lens is provided at an optical conjugate point with respect to a pupil. A surface of the relay lens system has an optical power of diffraction. The surface is positioned between the primary image and the optical conjugate point. The surface also has optical power of refraction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.