Track skipper for video disc player
AssigneeRCA Corporation
InventorJohn C. Bleazey
Life of this patent
Estimating the term…
Abstract
In a video disc player, a carriage is subject to translatory motion in correlation with radial motion of a playback stylus relative to a disc record disposed on a rotatable turntable. A stylus arm carrying the stylus at one end thereof has the other end secured to the carriage by means of a compliant rubber coupler. A magnetic element is disposed on the stylus arm near its free end. An electromagnet is fixedly mounted in the carriage adjacent to the stylus arm-mounted, magnetic element. The electromagnet is selectively actuated to cause a change in the radial location of the stylus.
Claims2
In a system for recovering prerecorded information from a disc record having a spiral information track by a track-following stylus when stylus/record relative velocity is established;
- wherein normal operation of said system involves sensing of said prerecorded information along successive convolutions of said spiral track in a regular progression toward one extremity;
- an apparatus comprising:
- (A) a carriage subject to translatory motion in correlation with radial motion of said track-following stylus during playback;
- said carriage having an opening in a bottom wall thereof;
- (B) a stylus arm having a longitudinal axis, and carrying said track-following stylus at one end thereof;
- (C) means for yieldably securing the end of said stylus arm remote from said one end to said carriage;
- said yieldable securing means permitting said track-following stylus to protrude through said opening when said stylus arm is lowered during playback;
- (D) a permanent magnetic element secured to said stylus arm near said one end thereof and disposed above said stylus arm relative to said record during playback;
- (E) an electromagnet for providing a controllable magnetic field of a desired polarity when energized;
- (F) means for mounting said electromagnet to said carriage in the vicinity of said permanent magnetic element;
- and
- (G) means for selectively energizing said electromagnet to cause a shift in the radial location of said track-following stylus in a substantially radial direction, said radial direction depending upon the polarity of said controllable magnetic field.
Dependencies are inferred from the claim text.