Power source switch for use in a camera circuit to detect a focused condition
US4142788A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 3, 1977 |
| Grant date | Mar 6, 1979 |
| Priority date | — |
| Expiry date | Mar 3, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/30
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention relates to a power source used in a camera having a circuit for detecting a focused condition determining the distance at which the focused condition is established. The invention is particularly suited, for preventing careless opening of the power source by providing an operating member on the lens barrel or a light or temperature sensing element either in the lens barrel or in the view finder respectively. In this manner the power supply switch is functionally engaged in the operating member or operates in response to the output of either the light or temperature sensing element so as to close the current supply circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.