SU1578764A1 - Device for shaping signal of magnetic heads displacent speed - Google Patents

Abstract

The invention relates to a magnetic recording technique, namely, automatic mechanisms for feeding magnetic heads to predetermined addresses, and can be used in magnetic disk drives having a tracking positioning system. The goal is to improve the accuracy of signal formation with increasing positioning speed. The signals from the outputs of the D / A converter 4 and the switch 7 are summed in the amplifier 5, the third input of which receives a signal compensating the bias voltage. The compensation signal is the actual speed signal supplied at the appropriate scale and polarity. From the output of summing amplifier 5, a smoothed signal is supplied to control the servo drive of the magnetic heads. 2 Il.

Description

1

The invention relates to a technique of magnetic recording, in particular to automatic devices for supplying magnetic heads at adan addresses in magnetic disk drives, and is an additional 5 to the auth. St. No. 1510003.

The purpose of the invention is to improve the accuracy of the speed signal formation with increasing positioning speed.

FIG. 1 shows a functional 10 device layout; FIG. 2 shows timing charts for his work.

A device for generating a speed signal of magnetic heads contains a comparator circuit 1, a difference counter 2 15, a limit transfer circuit 3, a digital-to-analog converter 4, a summing amplifier 5, a counter 6, a decoder-switch 7, buses 8 and 9 of the position signals P and Q, bus 10 preset and 20 bus 11 signal the actual speed.

The device works as follows.

The specified movement in the form of a digital code is entered into the difference counter 2, from 25 outputs of which, through the restriction circuit 3, goes to the digital-to-analog converter 4, where it is converted into a voltage level which, passing through the summing amplifier 5, begins to control 30 the next drive, the drive moves magnetic heads, one of which (servo-head) reads pulses from magnetic marks recorded on a special disk (servo-disk), from which 35 P and Q position signals are formed. Comparator diagram 1 forms of these sy gnal impulses

L / V

/

No. W

counting the traversed tracks, which are fed to the subtraction input of counter 2 difference, reducing its contents, as well as to the input of counter 6, which controls the operation of the decoder-switch 7. The counter b is preliminarily set from a bus 10 signal to a definite state that prevents the decoder from triggering - switch 7, bus 10 may be, for example, bus track 000 (track 0) or track type. The output signals from the D / A converter 4 and the switch 7 are summed in the amplifier 5, the third input of which receives a signal that compensates for the bias voltage. The compensation signal is the actual speed signal supplied at an appropriate scale and corresponding polarity. The actual speed signal can be generated, for example, by an electronic tachometer.

With the output of summing amplifier 5, the smoothed signal is supplied to control the servo drive of the magnetic heads.

Formula of the invention. A device for generating a signal of the speed of movement of magnetic heads along the ed. St. No. 1510003, characterized in that, in order to increase the accuracy of forming the speed signal with increasing positioning speed, a signal bus of the actual speed of movement of the magnetic heads, which is connected to the newly introduced additional input of the adder, is introduced into it.

/

/

/

X

Claims (1)

Claim A device for generating a signal of the speed of movement of the magnetic heads according to ed. St. No. 1510003, characterized in that, in order to increase the accuracy of generating a speed signal while increasing the positioning speed, a signal bus of the actual speed of movement of the magnetic heads is introduced into it, which is connected to the newly introduced additional input of the adder.