Focus detection device and accompanying optical equipment
US5825016A · kind A · utility
16Cited by
7References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 6, 1996 |
| Grant date | Oct 20, 1998 |
| Priority date | — |
| Expiry date | Mar 6, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/346
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Where a person is being photographed, for example, both light from the person located at closer range and light from the background located farther away enter the photodetector elements. Where the contrast of the background is high, the rate at which the information from the background contributes to the focus detection becomes larger, which hinders accurate focus detection with regard to the person. In this case, the focus detection device divides a predetermined focus area into smaller areas and detects focus condition in each smaller area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.