Camera having a lens shutter mechanism
US5497208A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 1994 |
| Grant date | Mar 5, 1996 |
| Priority date | — |
| Expiry date | Sep 9, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B9/24
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A camera having a lens shutter mechanism in accordance with the present invention comprises sectors lying in a lens frame and forming a predetermined exposure aperture, a drive ring for opening and closing the sectors, a high-speed sector opening lever and a low-speed sector opening lever which drive the drive ring through an interlock lever, a plurality of springs having different strengths and constraining the high-speed sector opening lever and low-speed sector opening lever, a sector closing lever for driving the high-speed sector opening lever and low-speed sector opening lever in a direction causing the sectors to close, a mode changing member for changing shutter speeds by selecting whether both or either of the high-speed sector opening lever and low-speed sector opening lever should be driven, a charge cam gear for resetting the shutter mechanism to an initial position after exposure is completed, and a groove bored along the optical axis in a camera body and designed to guide the drive ring along the optical axis when the lens frame collapses and to restrain the drive ring from rotating about the optical axis after the lens frame completes collapsing. Only a minimum numbe…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.