Diaphragm device
US5072249A · kind A · utility
7Cited by
1References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 24, 1989 |
| Grant date | Dec 10, 1991 |
| Priority date | — |
| Expiry date | Nov 24, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B9/06
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A diaphragm device of reduced diameter in the entirety comprising a base plate having a substantially round central opening, first diaphragm blades whose one ends are supported about respective pivot pins on the base plate, a first member arranged to turn all the first diaphragm blades about the pivot pins, the same number of second diaphragm blades as that of the first diaphragm blades arranged in confronting relation to the first diaphragm blades and whose one ends are supported about respective pivot pins on the base plate, and a second member arranged to turn all the second diaphragm blades about the pivot pins.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.