| 摘要 |
PURPOSE:To simplify a structure and to reduce the loss of light quantity and the limit of visible area by composing a horizontal direction image-formation lens plate having a periodic curvature in a horizontal direction, a shield grid having early same period as the image- formation lens plate in a horizontal plane and a three-dimensional video reproduction lens plate having a periodic curvature in a horizontal direction. CONSTITUTION:The horizontal direction image-formation lens plate 2 has the curvature only in the horizontal direction and its focal distance and a distance D between the back surface of the three-dimensional video reproducing lens plate 4 and said lens plate 2 are selected so that a line image group on the back surface of a protective glass plate 1 can be formed in the horizontal direction on the back surface of the three-dimensional video reproducing lens plate 4 in nearly equal magnification. Supposing that the fine line image group turning to a vertical direction, obtained by making N lines drawn on the back surface of the protective glass plate 1 as one set is an object, the position, the form and the dimension of the shield grid 3 are fixed so that light beams emitted from the line image group are made to arrive at only back surface of one element lens of the three-dimensional video reproducing lens plate 4 which exists in front of the line image group. Since the curvature of the horizontal direction image-formation lens plate 2 is limited in the horizontal direction and the shield grid 3 is a vertical grid group, the structure is simplified and the loss of the light quantity can be reduced. |
