Automatic focusing method and camera provided with automatic focusing apparatus
US4841323A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 9, 1988 |
| Grant date | Jun 20, 1989 |
| Priority date | — |
| Expiry date | Mar 9, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A camera provided with an automatic focusing apparatus having a lens-driving device (40) to move a photographing lens (50) in the direction of an optical axis to a focal position on the basis of a distance information from a distance-measuring device, a lens-positioning device (30) to determine a position of stoppage of the photographing lens (50) moved in the direction of the optical axis, and one motor (60) driving the two devices (40) and (30). An automatic focusing method of detecting a distance to an object by a distance-measuring device, moving the photographing lens (50) in the direction of an optical axis on the basis of the information on the distance, determining a position of stoppage of the photographing lens (50) at the same time substantially, and stopping the photographing lens (50) at this position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.