Finder optical system with low-hygroscopic organic material
US5581400A · kind A · utility
9Cited by
5References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 3, 1994 |
| Grant date | Dec 3, 1996 |
| Priority date | — |
| Expiry date | Nov 3, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B23/14
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A finder optical system including an objective system, an image erecting system for erecting an object image formed by the objective system, and an eyepiece system for observing the object image. These systems are constructed of low-hygroscopic organic materials. Thus, the finder optical system can prevent transient variations of optical properties caused by hygroscopicity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.