| 摘要 |
PURPOSE:To regulate and to prevent so-called tramp caused by the curve of a disk when the disk is rotated by forming guide parts which crimp the outer circumference part of the disk to be protrusive at the inside of a cartridge main frame opposed to the outer circumference part being out of the recording face of the disk. CONSTITUTION:The disk 1 made of a thin metallic film is housed freely rotatably in the cartridge main frame 13 and the guide parts 15 and 16 which crimp the outer circumference part of the disk 1 are formed to be protrusive at the inside of the cartridge main frame 13 opposed to the outer circumference part being out of the recording face of the disk 1. Therefore the outer circumference being out of the recording face of the metallic disk 1 is crimped by the guide parts 15 and 16 and housed freely rotatably in the cartridge main frame 13. Thus the so-called tramp caused by the curve of the disk when the disk is rotated is regulated and prevented.
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