Undertaking
Patent
1975-06-05
1977-11-29
Stephan, Steven L.
Undertaking
358128, G11B 724, H04N 128
Patent
active
040602486
ABSTRACT:
A playing apparatus, more specifically a video player for playing round records with a central hole, which are made of a transparent material, which records at one side have a transparent surface and at their other side are provided with information tracks which are optically readable with the aid of a read beam, which tracks are covered by a light-reflecting layer. In order to enable both relatively thick rigid records and relatively thin flexible records to be played on one playing apparatus, the invention provides a transparent adapter disc, which together with a flexible record can be positioned on the playing apparatus and driven in a rotary fashion. In order to prevent dust particles from being trapped between the flexible record and the transparent adapter disc, the adapter disc may be provided with a central recess with a number of air admission apertures at the circumference thereof, so that during operation a thin film of air is formed between the flexible record and the adapter disc.
REFERENCES:
patent: 2416135 (1947-02-01), Appleby
patent: 3249006 (1966-05-01), Stauffer
patent: 3825323 (1974-07-01), Landwer
patent: 3863266 (1975-01-01), Hoshino
patent: 3924063 (1975-12-01), Simons
Bulthius Kornelis
Lakerveld Herman Gerard
Sinjou Johannes Petrus
VAN Rosmalen Gerard Eduard
Cohen Simon L.
Stephan Steven L.
Trifari Frank R.
U.S. Philips Corporation
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