Finder optical system
US5194886A · kind A · utility
12Cited by
7References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 2, 1991 |
| Grant date | Mar 16, 1993 |
| Priority date | — |
| Expiry date | Apr 2, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B23/145
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a finder optical system provided separately from a taking lens system, an objective lens system forms a primary image which is an inverted image of a subject, a relay lens system erects the primary image formed by the objective lens system to form a secondary image which is an erecting image and can change the size of the secondary image, and an ocular enlarges the secondary image formed by the relay lens system and can change the enlargement ratio. The finder optical system is useful for a camera constituting the trimming system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.