Shutter device
US6071019A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 23, 1997 |
| Grant date | Jun 6, 2000 |
| Priority date | — |
| Expiry date | Jun 23, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/64
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a shutter device having a first driving lever which engages a shutter blade and which is given an urging force by a first spring and a second driving lever which is given an urging force by a second spring and which pushes the first driving lever from behind during an exposure action, the shutter device comprises a charge mechanism which, after the exposure action is performed by the shutter blade, causes the first spring and the second spring to be overcharged by moving the first driving lever and the second driving lever to an overcharging position and which, after that, returns to an initial position, wherein the first driving lever and the second driving lever are arranged to be moved from the overcharging position to an exposure start position by the urging forces of the first spring and the second spring, and wherein, after moving the first driving lever and the second driving lever to the overcharging position, the charge mechanism is urged toward the initial position by the urging force of the second spring obtained while the second driving lever is being moved from the overcharging position to the exposure start position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.