Patent
1973-12-20
1976-02-24
Canney, Vincent P.
17910041G, G11B 906
Patent
active
039405745
ABSTRACT:
Reproducing the information stored in the spiral track of a record-type information-bearing disc is achieved by uniformly charging the surface of the disc by means of a corona-generating device disposed in proximity to the disc, and, thereafter, using a conductive stylus riding in the track of the disc to pick up the charge from only the peak points of the track. All peaks are at the same height. The system preferably uses FM encoding, and the information is carried by the track according to the peak-to-peak spacing. The stylus is shaped in relation to the track such that it may not touch the peaks in the track. The stylus contacts the sides of the track for tracking purposes. An air breakdown between the peaks and the metallic portion of the stylus results in the signal picked up by the stylus.
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Anderson T. J.
Beck J. E.
Canney Vincent P.
Xerox Corporation
Zalman Leonard
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