Magnetic fluid sealer and method for mounting magnetic fluid sealer
US6830248B2 · kind B2 · utility
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6References
11Claims
0Family size
Assignee
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Key dates
| Filing date | Dec 18, 2002 |
| Grant date | Dec 14, 2004 |
| Priority date | — |
| Expiry date | Dec 18, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/20
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A high-performance magnetic fluid sealer which maintains light-shielding property even when an interval change of a gap is large and a method for easily mounting a magnetic fluid sealer. A pair of annular magnets are supported by levitation from a lens barrel by magnetic levitation force which a magnetic fluid imparts in a fitting groove in the inner peripheral face of a lens barrel. Therefore, even when the lens barrel is greatly eccentric to the lens barrel, the pair of annular magnets move radially so as to keep a constant gap from the lens barrel with the magnetic fluid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.