Focal-plane shutter having resilient stopping members for shutter blades
US6530703B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 20, 2002 |
| Grant date | Mar 11, 2003 |
| Priority date | — |
| Expiry date | Feb 20, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B9/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A focal-plane shutter comprises a shutter plate having a shutter opening, opening blades and closing blades for opening and closing the shutter opening, and arms connected by connector portions to the opening and closing blades for driving the blades parallel to the shutter opening to effect an exposure. Resilient stopping members are disposed to make resilient contact with the opening blades at opening positions thereof where the opening blades are retracted from the shutter opening, and other resilient stopping members are disposed to make resilient contact with the closing blades at closing positions thereof where the closing blades close the shutter opening. The resilient stopping members are positioned on opposite sides of the connector portions so that when the blades strike the stopping members, reaction forces are produced which cancel each other out thereby preventing excessive wear of the connector portions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.