Battery check device for a camera
US5528335A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 26, 1994 |
| Grant date | Jun 18, 1996 |
| Priority date | — |
| Expiry date | Sep 26, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B7/26
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A battery check device, suitable for use in a camera, for reliably checking the essential capacity of a battery power source without affecting the voltage recovery of the battery power source after a long period of non-use. The battery check device monitors a starting switch, for example, a main switch or a release button, with a timer circuit and compares a switch interval between a previous time the starting switch was set ON and a present time the starting switch is set ON with a predetermined time. When the switch interval is within the predetermined time, a battery check circuit checks the power supply capacity of the battery power source using a light load circuit. When the interval is not within the predetermined time, the battery check circuit checks the power supply capacity of the battery using a heavy load circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.