Shutter device and projection type video display
US7338174B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 17, 2005 |
| Grant date | Mar 4, 2008 |
| Priority date | — |
| Expiry date | Dec 12, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/3141
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Each shading plate comprises a rotating shaft and a driving shaft arranged vertically. First divided shading plate is loosely fitted to and supported by (not adhere to) the rotating shaft and rotates around the shaft. Second divided shading plates are fixed to the rotating shafts and rotate by rotating movement of the shafts. A driving shaft is connected longitudinally to (not adhere to) an edge of the first divided shading plate and supply power to rotate the first divided shading plates. Recesses are formed at the center of upper short side and at the center of lower short side of the first divided shading plate and the first divided shading plate and the second divided shading plates which form one and the same shading plate are so constructed that their short sides are overlapped each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.