Method and apparatus for testing styli

Details Method and apparatus for testing styli Method and apparatus for testing styli

1981-01-05

1983-02-22

Stephan, Steven L.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 53, 369 71, 369276, 369277, H04N 576, G11B 338

Patent

active

043750958

ABSTRACT:
A test disc record suitable for use in testing a capacitive playback stylus, which includes a stylus shoe which contacts a capacitive information disc record during playback and a stylus electrode which is used to recover information recorded in the capacitive information disc record by means of capacitance variations between the capacitive information disc record and the stylus electrode, wherein the test disc record includes in a major surface a continuous spiral groove which comprises an arrangement of a plurality of spiral groove turns wherein the width of a first spiral groove turn or portion thereof and signal information which can be read out by capacitance means contained in a second spiral groove turn or portion thereof which is contiguous with the first spiral groove turn or portion thereof may be used to test the width of the stylus electrode.
A method and an apparatus for testing the capacitive playback stylus which employs the test disc record.

REFERENCES:
patent: 3460841 (1969-08-01), Caldwell
patent: 3842194 (1974-10-01), Clemens
patent: 3842217 (1974-10-01), Clemens
patent: 3909517 (1975-09-01), Clemens
patent: 4030123 (1977-06-01), Taylor et al.
patent: 4030124 (1977-06-01), Allen
patent: 4037253 (1977-07-01), Nagaoka
patent: 4080625 (1978-03-01), Kawamoto et al.
patent: 4162510 (1979-07-01), Keizer
patent: 4208671 (1980-01-01), Ozawa et al.
patent: 4213148 (1980-07-01), Clemens
patent: 4296371 (1981-10-01), Keizer et al.

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