Lens control apparatus
US5956528A · kind A · utility
19Cited by
6References
32Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 25, 1997 |
| Grant date | Sep 21, 1999 |
| Priority date | — |
| Expiry date | Jul 25, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/102
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A lens control apparatus which corrects a variation in a focus position due to a zooming operation by driving a compensator lens at a standard speed according to a predetermined cam locus is arranged to determine a correction direction on the basis of an integral value of a high-frequency component and a correction speed on the basis of the ratio of the high-frequency component to a luminance difference, and to combine the correction speed based on the state of focus with the standard speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.