Variable aperture formed by linearly movable elements
US4904055A · kind A · utility
5Cited by
6References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 3, 1988 |
| Grant date | Feb 27, 1990 |
| Priority date | — |
| Expiry date | Oct 3, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/005
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A plurality of aperture blades are each provided with an opening having a V-shaped edge, such that when the blades are superimposed they cooperate to define a six-sided aperture. The blades are each mounted for rectilinear movement by a pair of guide pins. Cam pins supported on a driver rotated by a stepper motor engage cam slots in the blades and position them rectilinearly to change the aperture size.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.