| 摘要 |
<p>PHN 9648 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 turntable formed with a recess, and a centring device being provided which comprises a centring element which rotates with an information disc placed on said turntable and makes contact both with the wall of the recess in the turntable and with the wall of the central opening 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 invention 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 tolerances, and the use of a centring element which cooperates 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 compensation means which compensate for differences in the diameters of said walls through elastic radial deformations..</p> |
