SU566261A1 - Flux-responsive magnetic head - Google Patents

Description

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The invention relates to instrumentation, namely, to flux-sensitive magnetic heads in magnetic recording equipment.

A flux-sensitive magnet on the head is known with a branched magnetic circuit and windings forming an oscillating circuit with capacitors, a transistor amplifier connected with an oscillating circuit so that the entire system works in self-oscillating mode of frequency modulation of reproducible synthesis.

The closest in technical essence to the present invention is a flow-sensitive magnetic head comprising a magnetic core branched in the middle part, a main and additional identical generators and windings.

However, "well-known magnetic heads have relatively low sensitivity, V

The purpose of the invention is to increase the sensitivity of the head.

.Postavlenna; the goal is achieved by sabzhe-tion of the head of the phase-sensitive 1K-1 rectifier, moreover, two windings of the phaeochuvic rectifier located on the isthmuses of the magugg of the head, connected in series and; According to, and their connection point is connected through the winding of the pitcher Gras1 | prmator of the phase-sensing rectifier located on the magnetic circuit of the additional generator with the free ends of the first two windings.

The drawing shows the proposed magnetic head.

The magnetic head contains an axis: oh LC-generator with a map-topow head. additional identical LC-generator 2 s; support 5: eutechny e-3, phasephug - rectifier 4, magnetic conductor 5, identical, 1st branched part of the magnetic circuit of head 1, windings of the phase-sensitive rectifier 6 and 7, wound on the head magnetic wires; winding 8 pi.tayayuschih transformer phase1gur, sopitelpo1o vigf mitel, winding

on the magnetic circuit of an identical 11, C-generator.

The device works as follows

In the absence of a signal reproducible from a magnetic recording medium, the main C – C generator 1 generates a certain constant frequency. The frequency of the additional generator 2 is set equal to the frequency of the generator 1 using the trimming capacitance 3. In this case, between the voltages of the generators 1 and 2, the maximum phase shift vp 90 ° is set, and the voltage at the head output is zero.

When a signal reproduced from the recording medium appears, the magnetic flux, the passage through the Gyulovka map, changes the inductance. The LC circuit of the main generator 1. This leads to a decrease in the voltage phase on the oscillating circuit of the additional generator 2, but the frequency of the generators 1 and 2 remains the same. The voltages of both generators are fed to the phacosensitive rectifier 4 through the windings 6, 7 and 8, which are connected to the inductance windings of the generators by common magnetic conductors. The windings of the inductance of the generators perform the functions of the primary windings of the transformers. The voltage is removed from the output of the phase-sensitive rectifier, the value of which is proportional to the magnitude of the phase shift between the voltages of both generators, i.e., proportional to the magnitude of the signal reproduced with the recording media. ,

In the proposed head, the frequency locking phenomenon is used. The essence of this phenomenon is the mutual synchronization of the frequencies of two coupled oscillators operating at very close frequencies. Between identical LC-generators, there is a connection through the power supply busses and scattering fluxes of magnetic conduits. The presence of these connections leads to the fact that the npi operation of two generators configured

at exactly the same frequency, a zero phase shift is established between the voltages on the oscillating circuits. The slightest change in the flow read from the recording medium introduces a detuning of the head, the voltage of the generators will be dispersed in several phases, but their frequency will remain the same. Increasing the magnetic flux, you can bring the phase shift to 90. Only after that the generators begin to generate different frequencies. If another sign is misaligned, the same picture is obtained, but n is another phase sign. Within the pickup zone, the phase shift between the generator voltages changes dramatically with the slightest change in mismatch between the generators, i.e., the sensitivity of the magnetic head increases. The use of the proposed head will allow to obtain the output signal level significantly exceeding the output signal level from conventional inductive hoppo-wok and known flux-sensitive heads, which will simplify the circuits and design of the amplifying equipment.

Claims (1)

Invention Formula A flux-sensitive magnetic head containing a magnetic core branched in the middle part, main and additional identical generators and windings, characterized in that, in order to increase the sensitivity of the head, it is equipped with a phase-sensitive rectifier, and two windings of the phase-sensitive rectifier located on the magnetic cores heads are connected in series and in agreement, and their connection point is connected through the winding of the supplying transformer of the phase-sensitive rectifier located on the Agnit wire additional generator with free ends of the first two windings, -M-7V 1