Patent ID: 7248410
Filing Date: 2007-07-24
Classification: G02B,G03B

Abstract:
1. A transmission type screen comprising a plurality of screen members combined with each other to realize various optical functions of light and a frame holding the screen members, characterized in that a smooth surface having a surface roughness Ra of 0 μm≦Ra≦0.5 μm is formed on a viewer side surface of a nearest-to-viewer side screen member, which is located nearest to a viewer side, of the plurality of screen members, and in that the screen members are held by the frame such that an amount of warping D of the nearest-to-viewer side screen member is −10 mm≦D≦15 mm wherein D=(A+B)/2−C, A and B are distances from a measurement reference line to upper and lower side centers of the nearest-to-viewer side screen member, and C is a distance from the measurement reference line to the center of the nearest-to-viewer side screen member.