Signal pickup device for reproducing an information signal recorded on a track of a rotary recording medium

DETAILED DESCRIPTION Accordingly, it is a general object of the present invention to provide a novel and useful signal pickup device for reproducing rotary recording mediums, which device overcomes the above described problems.
Another and specific object of the invention is to provide a signal pickup device in which a permanent magnet member is fixed onto the proximal root part of a rotatably supported cantilever arm having a reproducing stylus at its distal free end.
The cantilever arm is subjected to a torque when a current is passed through a coil in the vicinity of the magnet member.
The torque provides for tracking control over the reproducing stylus.
Still another object of the invention is to provide a signal pickup device in which coils are provided for jitter compensation.
The coils are on opposite sides of a permanent magnet member, fixed on a cantilever arm for supporting a pickup stylus signal current responsive to any jitter error is passed through these coils to impart a displacing force upon the cantilever.
The displacing force is in an axial direction, acting on the permanent magnet member, thereby displacing the reproducing stylus in the track direction, whereby jitter compensation is accomplished.
A further object of the invention is to provide a signal pickup device in which jitter compensation coils are disposed in very close proximity to a permanent magnet member on a pickup arm, thereby to achieve jitter compensation with a high gain.
Other objects and further features of the invention will be apparent from the following detailed description with respect to preferred embodiments of the invention when read in conjunction with the accompanying drawings.