Light metering device with adjustable output
US5602617A · kind A · utility
0Cited by
14References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 10, 1995 |
| Grant date | Feb 11, 1997 |
| Priority date | — |
| Expiry date | Mar 10, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J1/44
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A light metering device incorporates a light dependent resistor as a light sensing element, a network including a plurality of circuit elements, and a selection mechanism for selectively connecting the light dependent resistor to one of the plurality of circuit elements in the network. The selection mechanism is controlled to set a voltage measured at an output terminal of the light dependent resistor within a predetermined threshold level. The light metering device can be readily incorporated in both photographic and electronic cameras.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.