One-hand zoom lens barrel
US4822153A · kind A · utility
37Cited by
2References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 2, 1986 |
| Grant date | Apr 18, 1989 |
| Priority date | — |
| Expiry date | Dec 2, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A lens barrel for a zoom lens in which zooming is achieved by moving both front and rear lenses but focussing is achieved by moving only the front lens. When a sliding ring slides linearly for zooming, a cam sleeve is rotated. A pin in the cam sleeve engages a cam groove in a moving frame for the front lens to thereby linearly move the front lens. Another cam groove in the cam sleeve engages a pin in the frame for the rear lens to thereby also linearly move it. Focussing is achieved by a threaded rotation of the frame for the front lens on the moving frame.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.