Finder optical system
US5495365A · kind A · utility
3Cited by
5References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 18, 1993 |
| Grant date | Feb 27, 1996 |
| Priority date | — |
| Expiry date | Jun 18, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B23/145
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A finder optical system includes an objective system having a positive refracting power, a reflecting member having a field frame of variable shape, for erecting an image, and an eyepiece system having a positive refracting power. At least one positive lens unit of the eyepiece system is moved along the optical axis, and at least one positive tens unit is inserted in the optical path of the eyepiece system. The magnification of the finder optical system can thus be increased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.