| 摘要 |
PURPOSE:To improve constriction quality totally of a screen, by controlling the length of a long shaped light source with beam shielding plates diagonally and vertically of axes of the screen. CONSTITUTION:Each pair of beam shielding materials 44, 44, 54, 54 constituted by variable and fixed every two sheets are provided on a long shaped light source 24. Shape of an opening part of the variable and fixed beam shielding materials 44, 44, 54, 54 are changed, and length of the light source is optionally controlled in the direction of central part-horizontal axis on one hand in the direction of vertical axis-diagonal axis in the other hand, then synchronized with a shutter of zone exposure to vary the length of the light source in each position of the internal surface of a panel. |
