Gas zoom lens
US4331388A · kind A · utility
16Cited by
4References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 25, 1980 |
| Grant date | May 25, 1982 |
| Priority date | — |
| Expiry date | Feb 25, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B3/12
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A multi-element lens is provided having a central cavity containing a heavy, high index gas. The central cavity is defined by a pair of meniscus elements and acts as a thick positive lens. The pressure of the gas in the cavity is varied in response to magnification changes desired, the pressure change causing a change in the refractive index of the gas thereby altering the focal length of the lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.