Varifocal lens device
US4881799A · kind A · utility
28Cited by
3References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 20, 1988 |
| Grant date | Nov 21, 1989 |
| Priority date | — |
| Expiry date | Apr 20, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/102
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Compensation of a deviation produced in the image forming position of a varifocal lens in consequence of magnification is attained by transforming a compensation amount into a relative amount of movement through arithmetic operation and driving the focusing lens group of the varifocal lens until the actual amount of movement conforms to the value obtained by the transformation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.