Optical disk cassette
First Claim
1. A cassette for an optical disk of the type comprising a plate possessing a first circular cavity for taking an optical disk and an envelope for containing the said plate, the envelope having an opening through which the plate may be inserted and the disk possessing a recording area on each side defined by two concentric circles of given first and second diameters, a second annular cavity being provided at the bottom of said first cavity of inner and outer diameters respectively less than and greater than those of the first and second given diameters, and in which a third cavity also of annular shape and of dimensions virtually equal to those of said second cavity is provided in the inner surface of the envelope cover, said second and third cavities being concentric when the plate is inserted in the envelope so that only unrecorded portions of said disk touch said plate or envelope independent of the orientation of said cassette in space.
1 Assignment
0 Petitions
Accused Products
Abstract
A cassette for storing and handling optical disks without touching them, including in particular video disks recorded on both sides, the cassette comprising a plate contained in a plastic envelope. The plate comprises a first cavity in which the disk to be protected is positioned. An additional annular cavity is provided in the bottom surface of the plate. The cover of the envelope comprises a cavity of shape matching that of the additional annular cavity such that the recorded areas of both sides of the disk are protected. Additional conical surfaces bearing one on the other are provided in the cover and plate around the edge of the first cavity. Means for locking the plate in the envelope are also provided.
47 Citations
9 Claims
- 1. A cassette for an optical disk of the type comprising a plate possessing a first circular cavity for taking an optical disk and an envelope for containing the said plate, the envelope having an opening through which the plate may be inserted and the disk possessing a recording area on each side defined by two concentric circles of given first and second diameters, a second annular cavity being provided at the bottom of said first cavity of inner and outer diameters respectively less than and greater than those of the first and second given diameters, and in which a third cavity also of annular shape and of dimensions virtually equal to those of said second cavity is provided in the inner surface of the envelope cover, said second and third cavities being concentric when the plate is inserted in the envelope so that only unrecorded portions of said disk touch said plate or envelope independent of the orientation of said cassette in space.
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9. A cassette for an optical disk recorded on both sides between two concentric circles comprising:
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a plate having a first circular cavity for receiving said disk, a conical bearing surface around the edge of said first cavity, a second annular cavity at the bottom of said first cavity having inner and outer diameters respectively less and greater than the diameters of said circles and two peripheral ramps extending over a given length and an envelope having an opening through which the plate may be inserted, a conical bearing surface bearing on the conical surface of said plate when said plate is in said envelope, two slots matching the shapes of said ramps to facilitate correct insertion of the plate into the envelope by slightly spreading by elastic distortion of the top and bottom surface of said envelope and a third annular cavity of dimensions virtually the same as the dimensions of said second cavity in the inner surface of said envelope so that unrecorded portions of said disk touch said plate or envelope independent of the orientation of said cassette in space.
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Specification