Misfocus prevention means for cameras having unidirectional automatic focusing
US4149792A · kind A · utility
8Cited by
8References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 30, 1977 |
| Grant date | Apr 17, 1979 |
| Priority date | — |
| Expiry date | Dec 30, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/40
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A variable focus lens capable of being moved within and outside of its normal focusing range by a manual and an automatic focus control system is provided with spring force biasing means to urge said lens into its normal focusing range to avoid the possibility of said lens being misfocused by said automatic focus control system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.