Range measuring device for camera
US4908646A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 1988 |
| Grant date | Mar 13, 1990 |
| Priority date | — |
| Expiry date | Jun 10, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/32
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Range measuring device for a camera measures the distances to objects respectively present in a central area of the photographing field and in plural areas including those surrounding the central area, then produces an outdoor signal indicating that the photographing is conducted outdoors or an indoor signal indicating that the photographing is conducted indoors, discriminates whether the object in the central area is the main object to be focused from the measured distance of the central area, and, if the distance in the central area is included in a reference distance range, determines the photographing distance based at least on the measured distance of the central area. The reference distance range is selected to be larger when the outdoor signal is produced than the case when the indoor signal is produced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.