Selectable aperture module
US4891738A · kind A · utility
47Cited by
6References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 26, 1988 |
| Grant date | Jan 2, 1990 |
| Priority date | — |
| Expiry date | Jul 26, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21W2131/406
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lighting system aperture mechanism formed by a movable carriage including a frame with openings for aperture means. The frame is moved to position a selected opening around a beam of light, and an aperture means disposed in the selected opening may be rotated as desired to produce special effect patterns in the beam of light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.