SU1580439A1 - Method of checking position of magnetic head - Google Patents

Abstract

The invention relates to instrumentation and can be used in the adjustment and testing of magnetic recording devices, such as tape paths, guides for magnetic heads. The invention allows to increase the accuracy of control. In the waveform 1, the width of zones 14 coincides with the width of the normalized track and the read track of head 4. Therefore, with the shown average position of head 4, the signal from demagnetized zones 14 is not reproduced, and the reproduced signals from recording sections 11, balanced in amplifiers 5 and 6, are subtracted by the input of the indicator 10 compensate each other. To eliminate the error caused by the discrepancy between the widths of zones 14 and the distance between the extreme edges of the head channels, as well as to enable the use of the waveform when the normalized track is located on the edge of the tape, closed demagnetized zones are made with a width smaller than the width of the read tracks of the head 4. 1 zp f-ly, 4 ill.

Description

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The invention relates to instrumentation and can be used in the adjustment and testing of magnetic recording devices, such as tape paths, guides for magnetic heads.

The purpose of the invention is the creation of a siphonogram, which provides an increase in the accuracy of control, and the development of a method in which improved control accuracy is combined with an increased productivity of control operations.

Fig. 1 shows a functional diagram of a device allowing the method of controlling the position of the magnetic head to be carried out; 2 and 3 are control waveforms; 4 shows timing diagrams for the operation of the device;

The device has one of the control signals of 1.2 or 3S magnetic head 4 with upper and lower channels connected to the inputs of amplifiers 5 and 6, respectively, rectifiers on diodes 7 and 8, adder 9 and indicator 10 with a central arrow.

Signalogram 1.2 or 3 has a JQ 11, 12 or 13 signal of constant amplitude placed along the magnetic tape, on which the zones 14, 15 or 16, respectively, in the form of demagnetized segments of tracks are formed by erasing.

The diagrams (Fig. 4a, b) show the voltage plots at the output of diodes 7 and 8, respectively, and in Fig. 4b, the output plots of the adder S. when the head 4 moves upwards relative to the waveform 2 or 3.

The diagrams (figs, 4d, e) show the voltage diagrams at the outputs of diodes 7 and 8, respectively, and in fig.4g -

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When the head 4 is biased or down, respectively, in the upper or lower channels reproduction signals appear that are proportional to the amount of displacement, which after subtraction take the form of diagrams in FIG. 4c or 4g, respectively, and are recorded by the deviation of the indicator indicator 10 in the corresponding direction by the corresponding value.

To eliminate the error caused by the discrepancy between the widths of the zones 14 and the distance between the extreme edges of the head channels, and also to allow the use of the waveform when the normalized track is located on the edge of the tape, closed demagnetized zones are made with a width smaller than the width of the readout track of the head 4 or normalized .

Claims (2)

1. A method of controlling the position of a magnetic head, based on a preliminary recording with subsequent two-channel reproduction and indication of a constant amplitude signal, characterized in that In order to improve the accuracy of control, before reproduction, part of the recording is erased with the formation of at least one demagnetized closed zone as a track segment, combined with a normalized two-channel reproduction track and not going beyond the last one, the signals reproduced by channel will be subtracted followed by an indication of the resulting signal, moreover, in the process of reproducing a portion of the phonogram outside the said demagnetized closed zone, the output of the adder 9 with the displacement of the head is the zero position of the indicator by ki 4 down relative to the waveform 2 or 3. control of the electric flea transmission coefficient of reproduction of e and during the subsequent reproduction of a portion of the phonogram with a demagnetizer control of the electric flea transmission coefficient of reproduction of e and during the subsequent reproduction of a portion of the phonogram with a demagnetizer In the signalogram 1, the width of zones 14 coincides with the width of the normalized additional closed zone, the magnitude and direction of the magnetic shift. horns and read tracks of head 4. Therefore, when the average position of head 4 is shown, the signal from demagnetized zones 14 is not reproduced, and the reproduced signals from recording sites 11, balanced in amplifiers 5 and 6, after subtraction at the input of indicator 10 compensate each other. 55 heads with respect to the normalized track of two-channel reproduction, they are monitored by the magnitude and direction of the indicator arrow deviation from the conventional value. 2. Method pop.1, characterized in that, in order to automate the process of regulating control of the electric flea transmission coefficient of reproduction, while the subsequent reproduction of a portion of a phonogram with a demagnetized closed zone, the magnitude and direction of the displacement of the magnetic heads relative to the normalized two-channel playback track, they are monitored by the magnitude and direction of the indicator arrow deviation from the track value. 2. The method of pop. 1, characterized in that, in order to automate the process of regulating the coefficient .g. a b B g d e Editor N. Tupitsa FogL Compiled by S. Podorsky Tehred M. Khodanich Proofreader L. Bezkid Order 2017 Circulation 488 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 ъ / 13 s.j Subscription