SU418892A1 - - Google Patents

Description

one

The invention relates to the field of magnetic recording, in particular to scanning devices for perpendicular magnetic recording.

A scanning device for perpendicular magnetic recording is known, which contains a U-shaped magnetic core equipped with a not sensitive element and a winding connected to the source of the underdraft signal, an annular magnetic core having a through slot and another winding connected to a sawtooth generator, a source of interrogation pulses and magnetic recording media having a working layer and a non-magnetic base.

Such a device can provide both recording and playback from a movable or fixed magnetic recording medium, but it does not provide a sufficiently high resolution.

In order to eliminate this drawback, a wedge-shaped plate made of a material with a rectangular hysteresis loop is inserted into the proposed device and a magnetic plate is fixed on its narrow side, reinforced in the through slot of the ring-shaped magnetic core, and a magnetic magnetic layer placed between the working layer and the non-magnetic base.

FIG. 1 depicts the described scanning device with sections along A-A and

BB; in fig. 2 - diagrams characterizing his work.

The scanning device comprises an annular magnetic core 1 made with a wedge-shaped through groove 2. On the annular magnetic core 1 there is a winding 3 connected to a nilo current generator (not shown). In addition, it contains H-shaped

a magnetic core 4, equipped with a flow-sensitive element 5, connected to a source of interrogation pulses (not shown in the drawings), and another winding 6 connected to a source of a recorded signal (on

drawings not shown). The ring-shaped magnetic core 1 and the H-shaped magnetic core 4 are coupled with a magnetic magnetic carrier, made in the form of a working layer 7, a non-magnetic base 8 and a magnetic soft layer 9 placed by them and ensuring the closure of the magnetic flux lines 10 of the magnetic flux.

The device also comprises a wedge-shaped plate made of a material with a rectangular hysteresis loop 11 and a magnetic flexible plate 12 placed on its narrow side, which are fixed in a wedge-shaped through groove 2 of the annular magnetic core 1.

In the recording process, a wedge-shaped plate made of a material with a rectangular hysteresis loop 11 is saturated by feeding a pulse to the winding 3. For this reason, the recording magnetic flux created by the winding 6 passes mainly through the magnetic soft plate 12.

In the process of reproduction, a variable polarity control current is fed to the winding 6 from a sawtooth current generator, the timing diagram of which is shown in FIG. 2a This leads to the fact that with an increase in the absolute value of the control current, the wedge-shaped plate of material with a rectangular hysteresis loop 11 begins to reverse magnetization in the opposite direction. In this case, in the region between the two directions of magnetization, a nonmagnetized zone 13 occurs, alternating in the direction of the arrow 14. Through the nonmagnetized zone 13 a magnetic flux of the signal recorded on the track 15 (Fig. 26) passes into the U-shaped core and excites the flow-sensitive element 5 appropriate reattachment. When applying the polling pulses (Fig. 2c), the cnnxpoHHfJx signal to the sawtooth current generator, the voltage of the current-sensitive element 5 is converted into a sequence of pulses (Fig. 2d) carrying information about the recorded digital signal.

Subject invention

Scanning device for perpendicular magnetic recording, containing a U-shaped magnetic core equipped with a flow-sensitive element and a winding connected to the source of the recorded signal, a ring-shaped magnetic core having a through groove and other winding connected to the sawtooth generator, current source of interrogation pulses magnetic recording, having a working layer and a non-magnetic base, from l and h and y n; This is due to the fact that, in order to increase the resolution ability, a wedge-shaped plate made of a material with a rectangular hysteresis loop was inserted into it and a magnetic plate fixed on its narrow side and reinforced in the through groove of the ring-shaped magnetic core and a magnetic layer placed between the working layer and non-magnetic base.

P I

FIG. 2