Lens assembly which zooms by combined movement of plural barrels
US5699200A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 30, 1996 |
| Grant date | Dec 16, 1997 |
| Priority date | — |
| Expiry date | Jul 30, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A lens assembly is disclosed in which the amount of movement of at least one lens unit is achieved by combining the amounts of relative movement of at least two barrels. A linear advancement barrel advances straight ahead relative to a fixed barrel. A first lens unit moves together with the linear advancement barrel. A second lens unit is located in front of the first lens unit along the optical axis. A third lens unit is located behind the first lens unit along the optical axis. A cam ring moves together with the linear advancement barrel along the optical axis and rotates around the optical axis. The cam ring has first and second cams that move the second lens unit and the third lens unit by amounts of movement relative to the linear advancement barrel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.