Eyepiece
US5749008A · kind A · utility
17Cited by
11References
35Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 16, 1997 |
| Grant date | May 5, 1998 |
| Priority date | — |
| Expiry date | Jan 16, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B25/001
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An eyepiece for use in a viewfinder optical system has a wide dioptric power adjustment range. The eyepiece is provided with, from a side of a secondary-image plane formed by a first, a second, and a third relay lens, a first, a second, and a third eyepiece lens having a positive, a negative, and a positive refractive power, respectively. For dioptric power adjustment, the positive first eyepiece lens or the negative second eyepiece lens is moved in an optical axis direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.