Automatic focus device
US5745804A · kind A · utility
40Cited by
4References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 11, 1996 |
| Grant date | Apr 28, 1998 |
| Priority date | — |
| Expiry date | Dec 11, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/36
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An automatic focus device capable of optimum focus lens driving control corresponding to the magnitude of the positional error of the focus lens. The automatic focus device specifies the target position of the focus lens based on information relating to the defocus distance of the focus lens, the velocity of the subject image, the current position of the focus lens and controls the driving power of the focus lens based on non-linear functions of the positional error defined as the difference between the target position and the current position of the focus lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.