Zoom lens apparatus with shared cam groove
US5907439A · kind A · utility
7Cited by
4References
8Claims
0Family size
Inventor
Key dates
| Filing date | Nov 10, 1997 |
| Grant date | May 25, 1999 |
| Priority date | — |
| Expiry date | Nov 10, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Two cam pins of the variable magnification lens group and the aberration correction lens group are guided by two side walls of one cam groove. Thus, two cam grooves can deal with three movable lens groups, and there is no need to provide three cam grooves. Consequently, the cam cylinder can be short, and thereby the zoom lens apparatus can be compact. A spring applies force to the two cam pins to separate from one another, so that the cam pins can be pressed against the side walls.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.