SU574601A1 - Device for measuring the gap between magnetic head and record carrier - Google Patents

Description

one

The invention relates to the field of instrumentation, namely, to measuring devices in the apparatus for recording and reproducing electrical signals.

Various devices for measuring the gap between the magnetic strip and the carrier, containing a magnetic head, a recording unit, a detector and a recorder 1, 2, are known.

However, their work is due to the presence of a large number of elements.

It is also known a device for measuring the gap between the magnetic head and the carrier, which contains a block of magnetic heads with insulated metal plates connected to an oscillatory circuit, and a recording unit 3.

This device has a complex construction and cannot be used in the process of operation of the device of the magnetic recording.

The aim of the invention is to simplify the device and expand its functionality.

The goal is achieved by introducing into the device a block of nonlinear function of one Variable, expressing the dependence of the gap between the carrier and the head on the amplitude of the reproduced silnal, connected between the recording unit and the amplitude detector, which is connected to the magnetic playback device.

The drawing shows a block diagram of a device for measuring the gap between a magnetic head and a carrier.

The device consists of a series-connected reproducing magnetic head 1, an amplitude detector 2, a block 3 of a non-linear function of one variable, and a block 4 of regnstracin. The device works as follows.

When an amplitude detector 2 arrives at the input of an alternating signal with a varying amplitude reproduced from a magnetic carrier (not shown) with a reproducing magnetic head 1, the monolithic signal consisting of a constant and proportional waveform consisting of a constant wavelength signal consisting of a constant wavelength of 2 and 2 is obtained. Jup, their, which is input to the block 3 nonlinear functions

one variable. Block 3 is a functional transducer that provides a set of functions for a single variable, 1 expressing the dependence of the gap between the workers of the multi plunger and nosntel on the amplitude of the reproducible signal in this channel of the given device. This is the inverse function with respect to the dependence of the amplitude of the reproduced signal on the gap. The latter must be determined in advance that it is experimental. In some cases, it can be determined theoretically.

Introducing such a unit into the device allows the output signal of the detector, proportional to the change in the amplitude of reproduction and Moro signal of the IBO time, to turn into a segment proportional to the current value of the navigation gap. At the output of block 3, we receive a signal proportional to the size of the gap between the surfaces of the reproducing head and the carrier, which is fed to the input of block 4 of the recording. The mean value of the gap is defined as the average value of the signal input to the recording unit, and its component, in the case of a rotating carrier, should be selected on the grounds that the parasitic signal is a periodic, th function of the angle of rotation of the carrier.

The use of such a device makes it possible to measure with high accuracy the gap between the magnetic head and the carrier directly in the active zone of the serial reproducing magnetic head of any storage device in which the amplitude of the reproduced signal somehow depends on the gap between the working surfaces and the carrier. The device itself is essentially simpler than the known devices of analogy.

Thus, the device gives "both technical and e economic effect.

Claims (3)

1. USSR author's certificate number 411517, cl. G 11B 27/36, 1971. 2. US patent number 3329943, cl. 340-174.1, publ. 1967. 3. USSR author's certificate JMb 229820, cl. G IV 5/46, 1967.