Apparatus for reading a disk-shaped record carrier to be...

G - Physics – 11 – B

Patent

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352/21, 352/32.2

G11B 17/02 (2006.01) G11B 7/08 (2006.01) G11B 7/095 (2006.01) G11B 17/022 (2006.01) H04N 5/76 (2006.01)

Patent

CA 1059620

ABSTRACT A record player especially for disk-shaped video records, provided with a centring device which in- cludes an adjusting mechanism, by means of which the turn- table is movable relative to a frame which is disposed on a rotary shaft; at least one electromagnetic drive means for controlling the adjusting mechanism and an electrical measuring system for measuring the eccentricity of the tracks and supplying a control signal to the drive means. The drive means includes at least tow movable transmission elements which act in mutually different di- rection, each transmission element being movably connected to the frame, engaging with the turntable under pre-tension and cooperating with a drive means, at least one resilient element being disposed between the drive means and the transmission element. As transmission elements levers, wedges, disks and cam disks may be used. A measuring system with a main and an auxi- liary detector supplies control signals, one of which after differentiation is mulitplied by the other one. The product signal together with a trigger signal yields the control signal for the drive means via a multivibrator. - 28 -

220671

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