Turntable device for an information disc

Details Turntable device for an information disc Turntable device for an information disc

1988-02-11

1996-05-21

Weinhardt, Robert A.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Specific detail of storage medium support or motion production

369271, 369290, 369282, G11B 17028

Patent

active

055196870

ABSTRACT:
Turntable (10) has a turntable bottom (19) and a turntable wall (20) which together define a locating space (21) in which the hub (7) of an information disc is engageable, and in which it is centered by means of a centering member (12) and clamped by magnetic clamping means. At the circumference of the locating space a centering wall (26) is provided, which wall has an inwardly sloping surface (27). The dimensions of the various parts, the field strength of the magnetic means and the coefficients of friction of the cooperating materials of the hub and the turntable are selected in such a way that, once an information disc has reached a position in which the free end of the centering member (22) has engaged the centering hole (17) of the information disc, the outer wall (28) of the hub (7) is situated above the sliding surface (27) of the turntable. The information disc is then automatically moved into the operating position under the influence of the magnetic forces exerted on it, which forces simultaneously cause the edge of the centering hole (17) to slide over the precentering surface (23) of the centering member (22) and the edge of the hub (7) to slide over the sliding surface (27).

REFERENCES:
patent: 3801476 (1974-04-01), Rischmann et al.
patent: 4351047 (1982-07-01), Redleah et al.
patent: 4587617 (1986-05-01), Mak et al.
patent: 4658393 (1987-07-01), Ohta et al.
patent: 4733388 (1988-03-01), Fujimoto et al.

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