Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1984-06-21
1986-03-18
Stephan, Steven L.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 53, G11B 300, H04N 576
Patent
active
045773033
ABSTRACT:
Test equipment is provided for determining the size or the degree of wear of a phono pickup needle. The static friction which is experienced by a motion of the stylus in the groove of a record is measured. The test equipment employs components of a record player and includes a turntable capable of being turned manually. A base part is positioned on the turntable. An axis is disposed at the base part. A carrying part is supported by the base part and is rotatable about the axis such that the carrying part moves about in a plane parallel to the base part on the turntable. A test support area is made of a material corresponding to a phonograph record. The test support area is provided with grooves and rests on the carrying part such that the grooves correspond in their position to the grooves of a record and such that the stylus engages a groove. Elastic coupling means is provided between the carrying part and the base part. The restoring force of the coupling means increases with increasing relative turning of the base part with respect to the carrying part. Display means indicates the relative turning of the base part with respect to the carrying part.
REFERENCES:
patent: 2091022 (1937-08-01), Stuart
patent: 2740296 (1956-04-01), Andres
patent: 3328037 (1967-06-01), Lehmann et al.
patent: 3481609 (1969-12-01), Lukens
patent: 4165078 (1979-08-01), Kuehn
patent: 4375095 (1983-02-01), Keizer
Kasper Horst M.
Stephan Steven L.
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