Automatic focusing device wherein lens movement is controlled in accordance with lens hunting
US5402175A · kind A · utility
6Cited by
4References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 24, 1992 |
| Grant date | Mar 28, 1995 |
| Priority date | — |
| Expiry date | Nov 24, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/673
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An automatic focusing device including a focus detection circuit for detecting a focus state, and a motor for driving a focusing lens in accordance with an output from the focus detection circuit. The device controls the driving state of the motor in accordance with a result of comparing the amplitude of hunting of the focusing lens with a predetermined value when the direction of the drive of the focusing lens is reversed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.