Playback instrument for an information carrier disc

Details Playback instrument for an information carrier disc Playback instrument for an information carrier disc

1979-05-16

1982-03-30

Shepperd, John W.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Specific detail of storage medium support or motion production

369271, 369280, 369282, G11B 360

Patent

active

043228410

ABSTRACT:
A playback instrument for a record disc, the instrument including a turntable for supporting the disc to be played on which the disc is centered by means of a central bore, is provided with two annular, concentrically disposed, radially spaced flat bearing surfaces mounted on the turntable for the disc, the surfaces forming a rigid support, one bearing surface being disposed in the vicinity of the location of the center of such disc and the other bearing surface being disposed radially to the outside of the one surface at a distance from the location of the center of such disc, and disc holding components provided for exerting on such disc an attracting force of such magnitude as to cause the disc to contact the bearing surfaces over the entire area thereof.

REFERENCES:
patent: 663194 (1900-12-01), Myers
patent: 1637544 (1927-08-01), Bishop
patent: 2806704 (1957-09-01), Burdett
patent: 2943861 (1960-07-01), Redfield
patent: 3430966 (1969-03-01), Gregg
patent: 3670315 (1972-06-01), Fowler
patent: 3682487 (1972-08-01), Eriksson
patent: 3706085 (1972-12-01), Mowrey et al.
patent: 3912283 (1975-10-01), Hammond et al.
patent: 4065135 (1977-12-01), Doughty
patent: 4068851 (1978-01-01), Yamamura
patent: 4153257 (1979-05-01), Wittenberg et al.

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