Polygram Gmbh

Frederik B Nusselder

Hermann Grobecker

Adelbert Zielasek

Werner Heher

High storage density information carriers, particularly optically readable video discs and digital records, can only be read error-free by a playback device when the high requirements made of freedom from warping also remain guaranteed over long storage times. A cassette is provided to support and fix an information carrier only within its central portion which is free of information tracks and, by a sufficient spacing of the information carrier in the support-free area between a bottom portion and a cover portion contact with the information carrier in this area is avoided, even given consideration of maximally-admissible warping tolerances of the storage cassette and of the information carrier.

Storage cassette for high storage density, disc-shaped information

A storage cassette suitable for the simultaneous storage of two and more tracked disks is provided with a box-shaped center part having an intermediate bottom part which is respectively terminated at its upper side and under side with a cover in the form of a box-shaped floor part, whereby each floor part is hingeable mounted in a hinge at one side at the center part. The cassette construction enables a disk to be supported and held in the cassette adjacent each floor part and on either side of the intermediate bottom part by virtue of a raised seat and peg arrangement centrally disposed on those parts.

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Bussum, Netherlands

Frederik B Nusselder