Light metering device for camera
US5495313A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 5, 1995 |
| Grant date | Feb 27, 1996 |
| Priority date | — |
| Expiry date | Jun 5, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B7/09979
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a light metering device, first luminance information is calculated from the output of a first photoelectric converter which photoelectrically converts the light beam from a first area of the object field. After a predetermined time from the photoelectric conversion, second luminance information is calculated from the output of a second photoelectric converter which photoelectrically converts the light beam from a second area, having an overlapping area with the first area. A first overlapping area luminance, in the overlapping area of the first photoelectric converter, and a second overlapping area luminance, in the overlapping area of the second photoelectric converter are determined, and the light values in the first and second areas are calculated from the first and second luminance information and the first and second overlapping area luminance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.