| 摘要 |
PURPOSE: To improve the rigidity and accuracy and also to facilitate the cleaning of a disk by constituting of a sheath having a side part opening in which a reinforced end part component is mounted, and further arranging one window closing with one movable shutter. CONSTITUTION: The cartridge is provided with the substantially flat parallelepipedic shape and mainly formed by the sheath 20 which is formed by two same half sheathes 20, 20', and the half sheathes 20, 20' are joined each other by sealing or bonding, then the single component having the side part opening 21 is formed. The reinforced end part component 22 is mounted in the side part opening 21, and further each of the upper surface and lower surface of the sheath 20 or one of them is provided with the window 23, and each of the upper window and lower window is being closed by the shutter 25. By this arrangement, the high rigidity and dimensional accuracy are obtained, and the disk 24 is easily removed to attain the cleaning.
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