Camera shutter multi-mode controller providing in one mode a power-saving interval
US3990089A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 29, 1975 |
| Grant date | Nov 2, 1976 |
| Priority date | — |
| Expiry date | Oct 29, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B9/64
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The controller of this invention is an electro-mechanical arrangement for controlling the operation of a camera shutter of the focal plane type. An electromagnet in the controller serves as a transducer between electrical and mechanical portions. The electrical portion includes switching circuitry that operates in either a first or a second mode depending upon how long an exposure interval is required. A key feature involved in the second mode is that the switching circuitry provides energization current to the electromagnet for first and second sub-intervals separated by a power-saving interval during which the electromagnet is deenergized. The mechanical portion is arranged so that the follower curtain of the shutter is released in accordance with either first or second disengageable stop means depending upon which mode the switching circuit operates in.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.