Variable focal lens device
US4861146A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 21, 1988 |
| Grant date | Aug 29, 1989 |
| Priority date | — |
| Expiry date | Jan 21, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/102
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A variable focal lens device having an optical system comprising a variable power lens group and a focusing lens group disposed on one identical optical axis in which a deviation of a focusing position is resulted with an identical object when the focusing lens group is set at a predetermined focusing position from a nearest position to an infinite position on the optical axis corresponding too an object distance from a nearest distance to an infinite distance and then moving the variable power lens group along the optical axis thereby renewing an entire system focal length of the variable power optical system from a first focal length to a second focal length.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.