Electrically controlled radial mass shifting elements for turnta

Details Electrically controlled radial mass shifting elements for turnta Electrically controlled radial mass shifting elements for turnta

1974-11-14

1976-03-30

Cardillo, Jr., Raymond F.

Telegraphy

Systems

Simplex-reversing periodic

178 66P, 178 67A, 1791001S, 1791003V, 1791004E, 274 9A, 360 73, H04N 576, G11B 1700, G11B 1928

Patent

active

039476251

ABSTRACT:
An apparatus for reading disc-shaped information carriers which are provided with substantially circular tracks, in which information is stored in coded form, in particular picture information, which information carriers are disposed on a turntable, a read unit supplying a control signal to a control device for maintaining the reading speed constant.
The control device comprises at least two mass elements which are connected to the turntable symmetrically relative to the axis of rotation of the turntable, resiliently in the radial direction and rigidly in the tangential direction, which elements are radially movable in response to the control signal.
In one control device each element consists of an axially magnetized rod-shaped permanent magnet, which is attached to the turntable by at least one radially flexible leaf spring, a coil being disposed around each magnet, which coil is connected to the control signal.
In another control device each element is identically attached to the edge of a metal disc via a connecting rod, which disc is disposed centrally and loosely around the drive shaft of the turntable, at least one electro-magnet being disposed underneath the disc, which electro-magnet magnetically cooperates with the disc and is connected to the control signal.
The control signal is to be derived from a pilot signal in the information signal.

REFERENCES:
patent: 3829612 (1975-08-01), Beyers
patent: 3873764 (1975-03-01), Boltz, Jr.
patent: 3873765 (1975-03-01), Schoop et al.

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