G - Physics – 11 – B
Patent
G - Physics
11
B
352/33.3
G11B 7/00 (2006.01) G11B 17/028 (2006.01)
Patent
CA 1155549
PHN 9648 -27- ABSTRACT A standard system for writing and/or reading information comprises a drive unit and interchangeable information discs which can be placed on and removed from the drive unit and which are each formed with a central opening, the drive unit having a rotary turn- table formed with a recess, and a centring device being provided which comprises a centring element which rotates with an information disc placed on said turn- table and makes contact both with the wall of the recess in the turntable and with the wall of the central open- ing of the information disc. In order to render such a system suitable for the storage of larger amounts of information than has previously been possible, the inven- tion proposes the use of information discs with a rigid carrier and with a central opening whose inner wall has accurately been machined with tight dimensional toler- ances, and the use of a centring element which cooper- ates with at least one of the said inner walls of the central opening of the relevant information disc and the recess in the turntable via elastically deformable com- pensation means which compensate for differences in the diameters of said walls through elastic radial deforma- tions..
365918
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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