| 摘要 |
PURPOSE:To make a device thin when a screen is used for a projection enlarger type television by forming any one of surfaces of the first lens sheet to which projecting light is made incident first in the shape of a saw tooth consisting of a horizontal line part and an oblique line part. CONSTITUTION:As for a lens sheet A of a transmission screen, the surface of the left side consists of a lenticular lens 7, and the surface of the right side is formed to be a saw tooth shape constituted by repeating the oblique line part 8 and the horizontal line part 9. The beams of projecting light 10-12 which are made incident to the screen at an angle of theta4 are refracted by the lens 7, also are refracted by the oblique line part 8, the center light 11 is emitted in parallel to a normal of the sheet A, and the beams of light 10, 12 are emitted at an angle theta5 in the vertical direction. In this way, the incident light from the diagonal lower part is emitted around the normal, therefore, when this screen is used for the projection enlarger type television, a reflection mirror can be installed in parallel to the screen, and the device can be made thin. |
