SU1525740A1 - Piezoelectric stabilizer of speed of magnetic head movement - Google Patents

Abstract

The invention relates to devices for improving the quality of the process of recording and reproducing information in magnetic recording apparatus. In order to increase the accuracy and expand the possibilities of compensating the oscillations of the tape speed, the base 1 is inserted into the device, on which four fixed guides 3 are installed, the magnetic head 2, the holder 5 to which the rocker arm 7 is suspended by two flexible metal tapes 6, on which two pushers are mounted 8, forming, together with the fixed guides 3, two pockets A and B with a carrier 4. A piezoceramic plate 9 is attached to the holder 5 by the middle, the console protruding ends of which are attached by means of the t g 10 The yoke 7, wherein the plates of the piezoceramic plate 9 are divided across into two parts and connected into groups, and the outputs of the control signal generating unit 11 are connected to them. 2 Il.

Description

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The invention relates to instrumentation and can be used to improve the parameters of the process of recording and reproducing information on magnetic media in magnetic recording apparatus.

The purpose of the invention is to increase the accuracy of the stabilization of the speed of the magnetic tape.

Figure 1 presents the scheme of the stabilizer; Fig. 2 is a diagram of the connection of the plates of a bimorph actuator.

The stabilizer comprises a base 1, on which the magnetic head 2 is mounted, four fixed guides 3 installed in contact with the magnetic tape 4, as well as a holder 5 to which the rocker 7 is suspended by means of two flexible metal plates 6 the ends of which have two pushers 8, which are similar in construction to the guides 3, which together form two pockets A and B with a specific carrier length in them, the holder 5, in addition, a bimorph of the piezoceramic plate 9, con solo protruding ends of which are connected by means of m .10 to different ends of the rocker arm 7, the outputs of the control signal generation unit 1J, to the input of which the output of the speedometer 12 signals of magnetic tape speeding tailings are connected, are connected to common points of the plates 13 - 16 - points C and D, The plates of the bimorph piezoceramic actuator 9 are divided and joined as shown in FIG. 2, the plates are divided (a), kda) into two parts across. Thus, two parts were obtained, identical in parameters, I and II. The outer plates 13 and 16 of both parts are electrically connected (shown in FIG. 2), and at the same time each is connected to a common (14 and 15) facing plate of the opposite part of the piezoceric plate 9. The movement of the plate 9 is controlled through terminals C and D. -. The compensation of the speed fluctuations of the magnetic tape 4 is carried out as follows.

Magnetic tape 4 in the dynamics is disturbed by both sides of the zone of magnetic heads 2. Suppose that the tape moves in the direction shown by the arrow in FIG. 1, the control signal is reproduced from magnetic tape 4 by magnetic head 2, and the signals from it arrive at A forshfatel 12 tape speed fluctuation signals, such as a frequency demodulator. If there is no oscillation of the tape speed at the output of the control signal generator 11, there is no control signal and the actuating element 9 is not activated. If there is a change in the instantaneous speed of the tape 4, for example, the increase, at the output of the imaging unit 12 of the velocity fluctuation signals, a signal, for example, of positive polarity, is produced. It arrives at the control signal generator 11, in which a signal is generated to control the position of the ends of the bimorph plate 9, the plates of which are connected so that when voltage is applied to terminals B and D one end of the bimorph plate (I) moves in the direction of increasing the amount of tape in the pocket And those. it goes deeper into it, and the other end (II) in the direction of decreasing the amount of tape in pocket B. Thus, the tape cut between the pushers

t, e, in the magnetic head 2, slows down the speed. And vice versa, when the tape speed decreases in the zone of the filament head 2 at the output of the block, and a FormIpc signal, the end of the bimorph plate I moves in the direction of decreasing the amount of tape in the pocket A, and the end II, on the contrary, increasing the speed of the tape in the area of the magnetic head 2 in this way, the driver 11 is usually a controlled constant-voltage source that transforms the signal from the speed-oscillation signal generating unit 12 into a signal needed to control the motion of the beam rfnoy plate 9,

The proposed stabilizer provides compensation for the speed fluctuations of the tape and when reversing its direction of movement. In this case, it is necessary to change the phase of the control voltage in the control signal generating unit 1.1

Claims (1)

Invention Formula Piezoelectric tape speed stabilizer. containing a speed fluctuation signal generator connected to a block of magnetic reproduction heads, characterized in that, in order to increase the speed stabilization accuracy, a control signal forming unit, a holder, a rocker arm, two metal rods, two pushers made in the form of guiding ribbons and mounted on the beam, is bimorphic to a piezoceramic plate, the console protruding ends of which are connected by metal with the corresponding ends of the rocker arm, the middle part of the benmorphic piezoelectric plate is attached to the holder, the inner parts of the plates of the bimorph piezoceramic plate are separated and electrically connected to the pairs of outer plates of the opposite parts and the corresponding outputs of the control signal conditioning unit whose input connected to the speed sensor of the oscillation speed of the magnetic tape.