SU733003A1 - Device for compensating for accidental oscillations of transported magnetic tape - Google Patents

Description

The invention relates to instrumentation, and in particular to a device with which it is possible to compensate for random vibrations of a transported magnetic tape in a magnetic recording apparatus.

A device is known made with a device that allows compensation of random vibrations of a transported magnetic tape (ML) in a magnetic recording apparatus [1]. This device requires the use of additional magnetic heads, an electromagnet, a rod and a spring-loaded lever. In addition to bulkiness, such a device has a high energy intensity, which requires the use of powerful power sources.

Closest to the described is a device for compensating for random vibrations of a transported magnetic tape, containing a magnetic head with a number of windings, a bimorph piezoelectric transducer (BPP), divided into several identical pairs of sectors connected in pairs diametrically opposite to each other, and amplifiers-shapers connected to the windings of the magnetic head [2]. However, this device has relatively narrow frequency and dynamic ranges, and its functionality is not high enough.

The aim of the invention is the expansion of the frequency and dynamic ranges, ₅ as well as the functionality of the described device.

This goal is achieved by the fact that between one pair of sectors of the BPP coupled to a magnetic head (MG) and the first amplifier-shaper, the first control unit (BU) and frequency discriminator are connected sequentially, and between another pair of sectors of the same BPP and the second amplifier-shaper connected in series to the second control unit and the phase discriminator.

In FIG. 1 shows a general view of the device; in FIG. 2 is a cross-section with connection points of the elements and blocks of the circuit.

In the process of transportation, magnetic 20 tape 1 in the vast majority interacts with the working surface of MG 2 directly. BPP 3 is attached to a metal spring 4, which are mounted together on a common housing 5. The middle sec. not shown). The extreme sectors 10 are connected in pairs opposite to each other and through the control unit 11, the phase discriminator 12 and the amplifier-former 13 can be connected to other autonomous head windings (not shown in the drawings).

In the process of transportation, the ML makes in addition to the planned oscillations, for example, when it is exposed to vibrations created by the BPP through the MG, random fluctuations that reduce the reliability of the recorded and reproduced information. In this case, the signal reproduced at the output of discriminator 8 has an amplitude, the magnitude of which is proportional to the fluctuations in the speed of the transported ML. This signal is supplied through the control unit 7 to sectors 6 (they are located on both sides of the spring 4), as a result of which the power supply unit bends and this moves the MG, which makes it possible to compensate. temporary distortions resulting from vibrations of a moving ML. The chain with discriminate _2J rum 12 similarly monitors ML bias. As a result, it is possible to carry out combined control of the position of the MG.

Compensation of random ML fluctuations allows to reduce the cost of recording and reproducing information, since there is no need for double-checking or duplication of recorded programs.

Claims (2)

Torus 6 BPP through BU 7, frequency discriminator 8 and the amplifier-shaper 9 is connected to the head 2, which in this area may be a separate winding (not shown). The extreme sectors 10 are connected in pairs opposite to each other and through the CU 11, the phase discriminator 12 and the amplifier-caper 13 can be connected to other autonomous head windings (not shown in the drawings). In the process of transporting the ML, in addition to the planned fluctuations, for example, when exposed to it through the MG oscillations created by the BPP, random fluctuations that reduce the reliability of the recorded and reproduced information. In this case, the signal reproduced at the output of the discriminator 8 has an amplitude whose magnitude is proportional to the fluctuations of the velocity of the transported ML. This signal through the CU 7 is applied to sectors 6 (they are located on both sides of the spring 4), with the result that the BNP bends and this moves the MG, which makes it possible to compensate. temporal distortions resulting from oscillations of moving ML. The circuit with discriminator 12 similarly tracks the imbalance ML. As a result, it is possible to carry out a combined control of the position of the MG. Compensating for random fluctuations in the ML allows you to reduce the cost of recording and reproducing information, since there is no need to re-check or duplicate recorded programs. Apparatus of the Invention A device for compensating random oscillations of a transported magnetic tape containing a magnetic head with a series of windings, a bimorph piezotransducer divided into several identical pairs of sectors, connected in pairs diametrically opposite to each other, and connected to the windings of the magnetic head shaping amplifiers, characterized in that in order to expand its frequency and dynamic ranges, as well as its functional capabilities, between one pair of piezotransducer sectors, with The first control unit and the frequency discriminator are connected in series with the first driver and the former amplifier, and the serially connected second control unit and the phase discriminator are connected between the other pair of sectors of the same piezoelectric transducer and the second amplifier driver. Sources of information taken into account in the examination 1. US patent number 3769464, cl. 179-100.2, publ. 1973. 2. USSR author's certificate number 474047, cl. G 11 V 15/28 (prototype). W