Focus detecting system for camera utilizing correction data on the aberration of the photographic lens
US4818865A · kind A · utility
22Cited by
8References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 10, 1987 |
| Grant date | Apr 4, 1989 |
| Priority date | — |
| Expiry date | Mar 10, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/38
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A focus detecting system having a passive type automatic focusing apparatus and an active type automatic focusing apparatus. When the passive type automatic focusing apparatus is used, focus detection is made using light which is incident from a position close to an optical axis of a photographic lens, while in the case of using the active type automatic focusing apparatus, focus detection is made using light passed through a position far from the optical axis of a photographic lens. The focus detection value is corrected using a preset correction value to set the photographic lens in the best image position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.