Multiple shutter digital device
US4152853A · kind A · utility
Inventor
Key dates
| Filing date | Oct 11, 1977 |
| Grant date | May 8, 1979 |
| Priority date | — |
| Expiry date | Oct 11, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09F9/37
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A multiple shutter device for displaying digital information and including an opaque face plate having a plurality of transparent windows situated thereon, a shutter support plate facing and closely disposed behind the face plate and having a plurality of opaque shutters situated thereon, each shutter in unique alignment with one of the segment windows, a multi-track grooved rotary cam facing and closely disposed behind the shutter support plate, a plurality of cam follower arms each being pivotally attached to one of the shutters at a first end and having a second end provided with a cam track following pin which engages a track on the cam, each arm further having a point intermediate the first and second ends which is pivotally attached to the shutter plate, whereby rotation of the cam causes various combinations of the shutter to be actuated to open and close the segment windows and sequentially display one or more digital characters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.