Videodisc reader with longitudinally displaced turntable
AssigneeThomson-CSF
InventorsGuy Bourdon, Jean-Claude Lehureau
Life of this patent
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Abstract
There is disclosed a device for displacing a video disk with respect to a reading head which includes the driving of a conductive disk by means of a video disk rotational motor. The conductive disk passes through the air gaps of two electromagnets located on either side of the displacement axis of a movable member supporting the rotational motor. By differentially energizing the electromagnets, a force is produced which provides for forward and backward movement of the complete movable member of the reader.
Claims5
A device for providing a rectilinear displacement, with respect to a fixed support, of a rotary engine having a shaft, said displacement being in a direction perpendicular to the axis of rotation of said shaft, said device comprising:
- a movable carriage rigidly locked with said engine;
- means to guide said carriage along said perpendicular direction;
- magnetic means producing a first air gap provided on said support and producing a magnetic output across of said first air gap;
- a conductive disk fixed on said shaft and crossing said air gap wherein the magnetic output of said magnetic means produces said displacement;
- and
- electronic control means for controlling the magnetic output of said magnetic means in order to control said displacement of said rotary engine.
Dependencies are inferred from the claim text.