Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1980-07-07
1982-09-21
Shepperd, John W.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
33 1B, G11B 310
Patent
active
043510450
ABSTRACT:
Method and apparatus for obtaining a measure of or relating to lateral tracking error at each of a plurality of predetermined radial distances from the spindle axis of phonographic turntable equipment that includes a spindle (13), a rotatable platter (14), and a pivotally mounted tonearm (11) to carry a cartridge-mounted stylus (12) via a separate or integral headshell (16). The apparatus comprises an alignment protractor (20, 120) placed on the platter for arcuate movement about the spindle axis, and a device (30, 130, 40) mounted on the tonearm in place of the cartridge or both the cartridge and headshell. The alignment protractor (20) is marked with a plurality of equi-angularly spaced radial lines indicative of differing tracking error values and a plurality of equi-spaced transverse straight lines crossing all the radial lines and intersecting at right angles the radial line indicative of zero tracking error. The device (30, 40) is marked with a distance scale comprising a main line (35, 45) directed at the offset angle with respect to the tonearm and intersected by equi-spaced distance marks corresponding to and/or defining different stylus points (whereby each distance mark defines a different value for the stylus overhang distance).
REFERENCES:
patent: 3183004 (1965-05-01), Miessner
patent: 3283411 (1966-11-01), Steward
patent: 3493234 (1970-02-01), Voss et al.
patent: 3528077 (1970-09-01), Seiden
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