Shutter device and projection type video display

摘要

Each shading plate 22 comprises a rotating shaft 23 and a driving shaft 24 arranged vertically. First divided shading plate 22A is loosely fitted to and supported by (not adhere to) the rotating shaft 23 and rotates around the shaft 23. Second divided shading plates are fixed to the rotating shafts 23 and rotate by rotating movement of the shafts 23. A driving shaft 24 is connected longitudinally to (not adhere to) an edge of the first divided shading plate 22A and supply power to rotate the first divided shading plate 22A. Recesses C are formed at the center of upper short side and at the center of lower short side of the first divided shading plate 22A and the first divided shading plate 22A and the second divided shading plates 22B which form one and the same shading plate 22 are so constructed that their short sides are overlapped each other.