| 摘要 |
PURPOSE:To accurately realize focusing whenever a light transmitting plate is replaced by pressing a filing sheet against a supporting frame or the light transmitting plate supported with the supporting plate of the filing sheet of the filing sheet against the supporting block on a light source means. CONSTITUTION:The filing sheet 17 is inserted between a pressing plate 13 placed on the position where a free edge surrounds the condenser lens 2 of the light source means and the supporting plane 8a of the supporting frame 8. The frame part 17a of the filing sheet 17 is formed into a chevron section. The pressing plate 13 is brought into contact with the top surface of the frame part 17a and presses the frame part 17a of the filing sheet 17 downward. Thus, the filing sheet 17 is maintained by pressing it against the supporting plane 8a of the supporting frame. When the light transmitting plate 18 on the projecting position is replaced, it is moved by moving the filing sheet 17 in a direction X with the sheet 17 pushed against the pressing plate 13 by moving the supporting frame 8 in a direction Y. Therefore, focusing without deviation can be obtained at the time of replacing the light transmitting plate.
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