Photometering apparatus of camera for variably weighting different areas of an image area
US5289225A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 4, 1991 |
| Grant date | Feb 22, 1994 |
| Priority date | — |
| Expiry date | Jun 4, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B7/09976
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photometering apparatus for a camera is provided that includes a split type photometering device for measuring the luminance of an object to be photographed and in which an image area is divided into a plurality of object luminance measuring zones, an automatic focusing device which selectively has a focus lock mode in which once an object within an object distance measuring is in focus, the focus is maintained, and a non-focus lock mode in which the focus is continuously adjusted within the object distance measuring zone. The photometering apparatus also includes an exposure controller which varies the weighting of the luminance signals of the object luminance measuring zones of the split type photometering device, in order to calculate an exposure value, depending on the selection of the focus lock mode or the non-focus lock mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.