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PRISM SHEET FOR PROJECTION IMAGE DISPLAY DEVICE, SHEET TYPE OPTICAL ELEMENT, METHOD FOR MANUFACTURING SHEET TYPE OPTICAL ELEMENT AND PROJECTION IMAGE DISPLAY DEVICE
PRISM SHEET FOR PROJECTION IMAGE DISPLAY DEVICE, SHEET TYPE OPTICAL ELEMENT, METHOD FOR MANUFACTURING SHEET TYPE OPTICAL ELEMENT AND PROJECTION IMAGE DISPLAY DEVICE
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机译：用于投影图像显示装置的棱镜片，片式光学元件，制造片式光学元件的方法和投影图像显示装置
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摘要
PROBLEM TO BE SOLVED: To reduce the length from front to rear in a projection image display device and to increase the projection magnification while increasing uniformity of the luminance and sharpness of the screen. SOLUTION: The prism sheet is formed by densely arranging many thin prisms 3 each composed of a first inclined face 1 and a second inclined face 2. The angle 2 of the second inclined face is controlled to totally reflect the light transmitting through the first inclined face 1 and to allow the light to emit. The angle 1 between the first inclined face 1 and the second inclined face 2 is =45 deg.. A flat top face 5 is formed to connect the top edge of the first inclined face 1 and the top edge of the second inclined face 2. The angle of the top face 5 is controlled not to inhibit the light entering the first face 1 of the adjacent prism 3 and totally reflected by the second inclined face 2, and the angle is gradually varied over the prism parts 3 according to the incident angle of light. The prisms 3 have a function of a light diffusing layer or a tint layer, or a light diffusing layer or a tint layer is unitedly laminated in the exit side of the prisms 3. In the prisms 3 in the region near the optical axis A, the angles formed by the first and second inclined faces 1, 2 to the plane perpendicular to the optical axis A decrease to almost 0 in the prisms nearer to the optical axis A.
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