Display device with orbitally movable plates
US4021944A · kind A · utility
1Cited by
4References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 3, 1976 |
| Grant date | May 10, 1977 |
| Priority date | — |
| Expiry date | May 3, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09F11/23
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An opaque face plate has arrays of openings which are each arranged to form numerals when light is transmitted through a predetermined selection of openings. A plurality of opaque back plates are movably mounted behind the face plate, each back plate having an array of openings positioned to coact with face plate openings to form different numerals depending upon the position of movement of the back plate. Each back plate is driven in an orbital path in a plane parallel to the plane of the face plate by means which includes a slot in the back plate, and cam means coacting with said slot.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.