Automatic focusing device
US4482234A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 1982 |
| Grant date | Nov 13, 1984 |
| Priority date | — |
| Expiry date | Nov 15, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/34
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An automatic focusing device includes a detecting device for detecting a state of an object image formed by an objective lens, a driving device for driving the lens in response to the detecting device, and a setting device for setting a moving range in which the lens is movable by the driving device. The moving range may be selected from mutually different plural ranges including a first range and a second range which have a mutually overlapping portion, or including a range containing a part of a normal moving range and a part of a macro-photographing moving range. Further, the moving range may be selected by setting an end position thereof beyond which the lens is prevented from moving.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.