Latched shutter system having automatic delay of latch reset
US4032941A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 1975 |
| Grant date | Jun 28, 1977 |
| Priority date | — |
| Expiry date | Aug 28, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B9/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An exposure control system for photographic apparatus utilizing electrically controlled shutter-diaphragm blades mechanically latched in a light-blocking condition in conjunction with a latch actuator which delays return of the released latch to the blade path prior to commencement of the exposure interval during which scene light is passed to the film. In the illustrated embodiment, the actuator enables a latch element for release and energizes the blades to draw them slightly further in a light-blocking direction from the latched position so as to release the latch just prior to initiation of the exposure interval, and the actuator includes an over center spring arrangement which provides a decrease in the required force of actuation as the system is electrically energized so that the operator inherently holds the actuator in an operating position with the latch element held out of blade engagement for a time sufficient to allow escape of the blades from the latch position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.