Automatic focusing device and automatic exposure control device
US4728980A · kind A · utility
24Cited by
3References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 4, 1986 |
| Grant date | Mar 1, 1988 |
| Priority date | — |
| Expiry date | Aug 4, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B7/095
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An automatic focusing device which comprises a defocus amount detecting unit for detecting a defocus amount attributable to a first optical system of an interchangeable lens assembly and a second optical system of an AF convertor, a converting circuit for converting the defocus amount into a data corresponding to a focusing amount of the second optical system which varies in non-linear relationship to the defocus amount, and an optical drive unit for moving the second optical system on the basis of a data representative of the focusing amount supplied from the converting circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.