Focus detecting device having two selectively movable lenses
US4792669A · kind A · utility
15Cited by
11References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 30, 1986 |
| Grant date | Dec 20, 1988 |
| Priority date | — |
| Expiry date | Dec 30, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/346
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A focus detecting device which is provided with a field lens disposed on the predetermined imaging plane of an objective lens and a plurality of imaging lenses disposed rearwardly of the field lens and in which the images of the imaging lenses are sensed to thereby determine the focus adjusted state of the objective lens. A unit body integrally constitutes the units such as the field lens and the imaging lenses and has a surface for movably supporting the field lens. The unit body also has adjusting device for rotating the imaging lenses relative to the optical axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.