Zoom lens drive mechanism
US5305149A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 22, 1993 |
| Grant date | Apr 19, 1994 |
| Priority date | — |
| Expiry date | Mar 22, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A zoom lens drive mechanism, for translationally driving and positionally locating a lens subgroup of a zoom lens to a zooming position along an optical axis of the zoom lens, comprises a base ring member having an aperture concentrically defined about the optical axis of the zoom lens and a drive ring member rotatably mounted on the base member for concentric rotation about the optical axis with axial constraint. A translatable lens subgroup ring member is suspended concentrically from the base and drive ring members by means of rods independently coupled at first ends thereof to the base and drive ring members and joined at second ends thereof to a common pivot point on the translatable ring member. Alternative split ball joint arrangements are described for coupling the suspension rods to the translatable ring member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.