ROTARY HEAD DEVICE FOR MAGNETIC RECORDING AND REPRODUCING DEVICE

摘要

PURPOSE:To supply the power to a revolving preamplifying means with high stability and high reliability by rectifying the AC signal produced from an AC signal generating means by means of a rectifying means when a video head is revolving and stabilizing the output of rectification to apply it to the power supply of the preamplifying means. CONSTITUTION:A recessed/projected tooth is provided at the lower outer circumfer ential part of an inner tooth 34 of an AC signal generating means which is fixed to a thrust holding tool 9 with a screw 35 together with a rotor 11 of a motor. While an outer tooth 38 of said signal generating means is provided at the outer circumferen tial part and opposite to the recessed/projected tooth of the inner tooth 34. The outer side of the tooth 38 is adhered to a motor cover 39, and the tooth 38 also has a recessed/projected tooth at the inner side of the tooth 38. The lead wires 41 and 41' led into a pierced hole of a hollow rotary shaft 33 are connected to an AC signal rectifying means 42 through repeating terminals 40 and 40'. The rectifying means 42 is formed at a part of a circuit base board 29 fixed to the upper side of a rotary cylinder 4 and rectifies the applied AC signal by the rectifying function of a diode and a capacitor. Thus the AC signal is stabilized to the prescribed DC voltage and applied to the power supply of a preamplifying means 31.