Automatic focusing device for use in a camera
US4825237A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 1988 |
| Grant date | Apr 25, 1989 |
| Priority date | — |
| Expiry date | Mar 17, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/282
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An automatic focusing device for use in a camera using photographic lenses having a variable power region in which an entire focal length of a variable power optical system comprising a variable power lens group, a focusing lens group and a macro lens group disposed on an identical optical axis can optionally be set by the variable power lens group between a shortest focal length and a longest focal length, a macro region capable of macro photographing by the macro lens group, a variable power focusing region from an infinite position to a nearest position on the optical axis corresponding to an object distance from an infinite distance to a nearest distance and a macro focusing region capable of macro photographing in a predetermined region disposed from a nearest position on a side opposite to an infinite position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.