Signal pickup device with tracking control and jitter compensation for a video disc

A signal pickup device in an apparatus for reproducing an information signal recorded on a track on a rotary recording medium in a horizontal surface, said signal pickup device comprising:

• a reproducing stylus for tracing the track on the rotary recording medium thereby to reproduce the information signal;
• a cantilever provided at a free distal end thereof with the reproducing stylus;
• means for supporting said cantilever so as to be rotatable about substantially proximal root end thereof and movable in an longitudinal direction thereof;
• coil means including at least two movable coils fixed to said support means, with the winding axial direction thereof coinciding with the longitudinal direction, and supplied with a control signal independently;
• means generating a control signal current to be supplied to said coils, and including a circuit for generating a tracking control signal current in response to tracking error, a circuit for generating a jitter compensation signal current in response to a magnitude of jitter detected, and operating circuit for conducting adding and subtracting operation between said tracking control signal current and said jitter compensation signal current, and
• magnetic field forming means secured at a predetermined position of a main body of the device and adapted to apply to said coils a magnetic field in a direction parallel with the rotary recording medium,
• said coils undergoing a motion due to a mutual interaction between the magnetic field and the current flowing therethrough, whereby said reproducing stylus is displaced by way of said cantilever in the width direction and longitudinal direction of said track and tracking control and jitter compensation are thereby accomplished.

A signal pickup device in an apparatus for reproducing an information signal recorded on a track on a rotary recording medium in a horizontal surface, said signal pickup device comprising:

• a reproducing stylus for tracing the track on the rotary recording medium thereby to reproduce the information signal;
• a cantilever provided at a free distal end thereof with the reproducing stylus;
• means for supporting said cantilever so as to be rotatable about substantially proximal root end thereof and movable in a longitudinal direction thereof;
• coil means including two movable coils connected in series and a single movable coil fixed to said support means, with the winding axial direction thereof coinciding with the longitudinal direction;
• means generating a control signal current to be supplied to said coils, and comprising a circuit for generating a tracking control signal current in response to tracking error, and a circuit for generating a jitter compensation signal current in response to a magnitude of jitter detected;
• and
• magnetic field forming means secured at a predetermined position of a main body of the device and adapted to apply to said coils a magnetic field in a direction parallel with the rotary recording medium;
• said coils undergoing a motion due to a mutual interaction between the magnetic field and the current flowing therethrough, whereby said reproducing stylus is displaced by way of said contilever in the width direction and longitudinal direction of said track and tracking control and jitter compensation are thereby accomplished.