| 摘要 |
PURPOSE:To make the transmission and screening of external light freely controllable, by providing two sheets of films wherein plural bands having different angles of polarization are connected alternately and successively in plural layers, containing the same in plural layers of glass and moving one sheet of the films. CONSTITUTION:Films 1, 1 are constituted by connecting alternately and successively a belt 1a having an angle alpha of polarization and a belt 1b having an angle beta of polarization orthogonal with the angle alpha of polarization. the films 1 are disposed in plural layers so as to face to each other, and are contained in two sheets of glass 2, 2. Two sheets of the glass 2 are held apart from each other by means of upper and lower support frames 3, 4. The end parts of the films 1 are held by holders 5, 5 having a pair of semi-circular cylindrical grasping grooves 5a, 5b, and the holders 5 are turned by the levers on the outside of the support frames. The left film 1 is made movable downward and the right film 1 upward by the leftward turning of the holders 5. |
