Detachable modular drive unit for projection screen apparatus
US4060310A · kind A · utility
45Cited by
0References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 6, 1976 |
| Grant date | Nov 29, 1977 |
| Priority date | — |
| Expiry date | Jan 6, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/58
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A projection screen apparatus includes a modular screen unit and a separate modular drive motor unit generally forming an extension of the screen unit. The screen unit has an elongate roller and a flexible screen which is wound on the roller when it is in a closed position and unwound from the roller when it is in an exposed position. The drive unit is detachably secured adjacent the screen unit and has an electric motor releasably coupled to the roller to rotate the roller to move the screen between exposed and closed positions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.