Focus detecting device for use with cameras
US4952966A · kind A · utility
140Cited by
21References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 11, 1988 |
| Grant date | Aug 28, 1990 |
| Priority date | — |
| Expiry date | Apr 11, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/34
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image sensing device capable of being utilized in an automatic focus detecting system includes a pair of sets of light sensing elements that are spaced from each other. These light sensing elements can have a variable accumulation time of storing electric charges depending upon the intensity of the light level incident thereon. Since the automatic focus detection system must be managed within the parameters of photography, a first and second light measuring element is uniquely positioned adjacent each of the sets of light sensing elements. The outputs of these light measuring elements can control the charge accumulation period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.