Dynamic information storage or retrieval – With servo positioning of transducer assembly over track...
Patent
1981-04-28
1984-01-31
Psitos, Aristotelis M.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
369126, 369251, G11B 700, G11B 900, G11B 1700
Patent
active
044293763
ABSTRACT:
A video disc player apparatus having a signal pickup stylus secured to a stylus arm for recovering recorded signal from a disc record, wherein the stylus arm is mechanically biased by a spring force to produce a positive stylus-disc pressure, includes apparatus cooperating with the stylus arm to maintain the stylus-disc pressure generally constant in the presence of stylus-disc displacements normal to the disc surface. A permanent magnet is secured to the stylus arm with its interpolar axis transverse to the stylus arm and substantially parallel to the disc record. First and second coils, coaxially aligned are disposed on either side of the magnet and arranged with their axes parallel to the interpolar axis of the magnet. Energizing currents are applied to the first and second coils creating respective magnetic fields which produce forces repulsive to the pole of the permanent magnet proximate thereto. The location of the permanent magnet with respect to the coil axis is arranged so that a component of the repulsive force tends to counteract changes in stylus-disc pressure due to displacements of the stylus arm in a direction normal to the disc record.
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U.S. Ser. No. 39,358, filed 5/15/79, Simshauser, "Track Skipper Apparatus for Video Disc Player".
Herrmann E. P.
Psitos Aristotelis M.
RCA Corporation
Tripoli J. S.
Whitacre E. M.
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