| 摘要 |
A magnetic recorder of the flexible disc type has an improved recording device comprising a pair of thin flexible recording discs having oppositely facing magnetizable surfaces and a flexible backing disc between the recording discs extending behind essentially their entire surface. A hub connects all three of said discs and forms the sole connection therebetween. The hub includes a central aperture and a drive aperture outwardly of the central aperture, the drive aperture including a surface extending along a chord of the hub to provide with the central aperture a unique two point attachment defining the center of rotation of the discs. A cassette surrounds the discs, protecting and supporting them, and including top and bottom walls spaced apart sufficiently to avoid substantial contact with the recording discs when the hub is rotated at recording speed. The top and bottom walls having openings sufficiently larger than and aligned with the hub to afford drive access to the hub and to allow the hub and discs to comply to a center of rotation established by the structure of the hub. The top and bottom walls having elongated transducer access ports extending on a radius of the discs and aligned with each other whereby air flowing outwardly in the cassette during rotation of the discs will tend to exit equally at both the top and bottom of the cassette to minimize disturbance of the plane assumed by the rotating discs.
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