Arrangement for vibrationless coupling of a phonograph record wi

Details Arrangement for vibrationless coupling of a phonograph record wi Arrangement for vibrationless coupling of a phonograph record wi

1979-05-09

1981-04-07

Stephan, Steven L.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369270, 369271, G11B 360

Patent

active

042601614

ABSTRACT:
An arrangement for vibrationless coupling of a phonograph record with the turntable of a phonograph, having a liner for placing between turntable and phonograph record and a center contact member placed over the centering pin of the turntable. The liner is made of acoustically inert material. It has indentations beveled at the rims for receiving thicker portions of the record. The record contact region for the modulated portion of the record increases in thickness from the inside towards the outside. The center contact member may have the form of a truncated cone with a cylindrical stump having a diameter smaller than the smooth center area of the record and the contact area may also have a centered recess. A spirit level clinometer may be centered in the flat area of the truncated cone. A stroboscope may be provided on the outer periphery of the cylindrical stump of the center contact member.

REFERENCES:
patent: 3997174 (1976-12-01), Kawashima

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