Velocity correction system for video disc player
AssigneeRCA Corporation
InventorsMinoru Toda, Susumu Osaka, Yasushi Matsumoto
Life of this patent
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Abstract
A pickup cartridge for use in a velocity correction system includes a polymer bimorph element mechanically interposed between a cartridge housing and a pickup arm carrying a groove-riding stylus. Signals representative of cyclical deviations in the stylus/record relative velocity are applied to the polymer bimorph element to cause displacement of the groove-riding stylus in a manner that opposes cyclical deviations.
Claims9
A pickup cartridge for use in a velocity adjusting system for opposing undesired cyclical variations in the relative velocity between a rotating disc record and a pickup means which is positioned adjacent to successive regions of a spiral information track disposed on the surface of said disc record for playing back signals recorded along said track;
- said pickup cartridge being removably subject to reception in a carriage which is translated along a path radially disposed relative to said disc record in correlation with radial motion of said pickup means during playback of said recorded signals;
- said system including means for developing a correction signal in response to cyclical variations of said relative velocity;
- said pickup cartridge comprising:
- (A) a demountable cartridge housing;
- (B) a pickup arm mechanically supporting said pickup means at one end thereof;
- (C) a piezoelectric bimorph element having a first edge and a second edge;
- said first edge being mechanically secured to said cartridge housing such tht said piezoelectric element is disposed within the confines of said cartridge housing;
- said second edge being mechanically secured to the other end of said pickup arm remote from said pickup means;
- and
- (D) terminals disposed on said cartridge housing for applying the output of said signal developing means to said piezoelectric bimorph element when said cartridge is received in said carriage;
- said piezoelectric bimorph element being so arranged that said application of said correction signal causes translation of said pickup means relative to said record along said information track throughout the range of said translation in a manner that opposes said cyclical variations.
A pickup cartridge for use in a velocity adjusting system for opposing undesired cyclical variations in the relative velocity between a rotating rigid disc record and a pickup stylus which is positioned adjacent to successive regions of a spiral information track disposed on the surface of said disc record for playing back signals recorded along said track;
- said pickup cartridge being removably subject to reception in a carriage which is translated along a path radially disposed relative to said disc record in correlation with radial motion of said pickup stylus during playback of said recorded signals;
- said system including means for developing a correction signal in response to cyclical variations of said relative velocity;
- said cartridge comprising:
- (A) a demountable cartridge housing;
- (B) a pickup arm mechanically supporting said pickup stylus at one end thereof;
- (C) a piezoelectric bimorph element having a first edge and a second edge;
- said first edge being mechanically secured to said cartridge housing such that said piezoelectric element is disposed within the confines of said cartridge housing;
- (D) an elastic coupler for mechanically securing said second edge of said piezoelectric element to the other end of said pickup arm remote from said pickup stylus;
- and
- (E) terminals disposed on said cartridge housing for applying the output of said signal developing means to said piezoelectric bimorph element when said cartridge is received in said carriage;
- said piezoelectric bimorph element being so arranged that said application of said correction signal causes translation of said pickup stylus relative to said disc record along said information track throughout the range of said translation in a manner that opposes said cyclical variations.
Dependencies are inferred from the claim text.