Brake device for focal plane shutter
US5315335A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 30, 1992 |
| Grant date | May 24, 1994 |
| Priority date | — |
| Expiry date | Jul 30, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B9/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A focal plane shutter comprising a front blade braking lever functioning to press a front blade actuating lever to a rotating shaft thereof by utilizing resilience of a front blade actuating spring at a final stage of an exposure operation performed by the front blade actuating lever and a rear blade braking lever functioning to press a rear blade actuating lever to a rotating shaft thereof by utilizing resilience of a rear blade actuating spring at a final stage of an exposure operation performed by the rear blade actuating lever. This focal plane shutter is simple in structure thereof, capable of controlling exposure of film with high accuracy and maintaining initial performance thereof for a long term, and can be manufactured at a low cost.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.