JPS62226401A - Magnetic head device - Google Patents

Abstract

PURPOSE:To minimize an azimuth by delaying signals from respective heads so that the phases of signals from plural laminated reproduction heads can be the same. CONSTITUTION:The laminated reproduction heads A-C function as a reproduction head independently and comprise one reproduction head unit. After the read signals available from the heads A-C are delayed by delay circuits 22-24, (fixed delay time 23, variable delay time 22, 24 they are added by an adder circuit 25, and turn out to be reproduction signals through a reproduction amplifier 27. With the signal from the circuit 23 as a reference a delay time control circuit 26 controls the phases of the signals from the circuits 22 and 24. When all the phases of the signals outputted from the circuits 22-24 are the same, a signal obtained by totaling said signal becomes maximum. Therefore the circuit 26 controls a delay time control signal so that a signal passing through the circuit 25 can be maximum. Thus an azimuth can be minimized even if an error between the azimuths of a piece of data recorded on a recording medium is present.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head device, and more particularly, to a magnetic head device in which the reproducing head and reproducing circuit of a magnetic recording/reproducing device are improved.

[Prior Art] A conventional magnetic head of this type is shown in FIGS. 3 and 4.

FIG. 3 shows the playback head. This reproducing head 5 abuts the core halves 1 and 2 through the gap 4, and the winding window 1a
The coil 3 is wound using.

The reproduction signal obtained by this reproduction head is processed by a reproduction circuit having a reproduction amplifier 6 as shown in FIG.

[Problem to be Solved by the Invention 1] In the reproducing head and reproducing circuit configured as described above, the azimuth angle of the reproducing head 5 and the azimuth angle of data recorded on a recording medium (not shown) are If there is an error between them, azimuth loss will occur.

Particularly when reading data recorded at high density, the gap width becomes narrow, and even a slight azimuth angle error causes a large azimuth loss, making it impossible to perform proper reproduction.

[Means for solving the problem] In order to solve the above-mentioned problem, in the present invention,
A playback head unit formed by stacking a plurality of playback heads each functioning independently, a circuit for delaying the playback signal of each of the plurality of playback heads, and detecting the phase of the playback signal of each playback head, We adopted a structure that includes a circuit that controls the signals so that they are in the same phase.

[Function] By adopting the above structure, the signals from each playback head can be delayed so that the sum of the signals from each playback head is maximized, and the azimuth angle of the playback head and the recording medium can be delayed. Even if there is an error between the azimuth angle of the data recorded in the data and the azimuth angle, the azimuth loss can be reduced and good reproduction can be performed.

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

1 and 2 illustrate an embodiment of the present invention. In this embodiment, the reproducing unit 21 has a structure in which three reproducing units A, B, and C are laminated. We are hiring.

The reproducing head A consists of core halves 7 and 8 and a coil 9 that are butted together through a magnetic gap 10, and the reproducing head B
are the core halves 1 which are butted together through the magnetic gap 15
2.13 and a coil 14, and the reproducing head C consists of a half-core core 17.
18 and a coil 19.

The reproducing heads A, B, and C function independently as reproducing heads, and are stacked with the same azimuth angle and the shield plates 11 and 16 interposed so that the gaps are on the same straight line. A head unit 21 is configured.

On the other hand, FIG. 2 shows a reproducing circuit. This reproduction circuit is a delay circuit 22. Delay circuit 23. A delay circuit 24 and an adder circuit 25 connected thereto. It has a delay time control circuit 26, the output of the adder circuit 25 is input to a reproduction amplifier 27, and the reproduction output is fed back to the delay time control circuit 26.

Next, the operation of this embodiment configured as above will be explained.

The read signals obtained from the reproduction radars A, B, and C are delayed through delay circuits 22, 23, and 24, respectively, and then these three signals are added together in an adder circuit 25, and then passed through a reproduction amplifier 27 and reproduced. It becomes a signal.

The delay circuit 23 has a fixed delay time.

The delay circuits 22 and 24 are configured such that their delay times can be varied by electrical signals.

Signals from the delay circuits 22, 23 and 24 and the reproduction amplifier 27 are input to the delay time control circuit 26, and delay time control signals are output to the delay circuits 22 and 24.

Here, the operation of the reproducing circuit when reading data recorded at an azimuth angle different from that of the reproducing head will be explained.

Considering the signal waveform read by the reproducing head 23 as a reference, the signal read by the reproducing head 22 is delayed (or leading) in phase, and the signal read by the reproducing head 24 is advanced (or delayed) in phase. ) is there. Each of these signals passes through a delay circuit and is input to the delay time control circuit 26.

The delay time control circuit 26 uses the signal from the delay circuit 23 as a reference to detect the phase advance or lag of the signals from the delay circuits 22 and 23, and when one phase is ahead, generates a signal to lengthen the delay time. , when the phase is delayed, a signal for shortening the delay time is output to the delay circuit 22 and the delay circuit 24.

Then, when the phases of the signals output from each delay circuit are all the same, the signal obtained by adding these signals becomes the maximum, so the delay time control circuit 26 adjusts the signal after passing through the adding circuit 25 to the maximum. The delay time control signal is controlled so that

Since this embodiment is configured as described above, even if there is an error between the azimuth angle of the reproducing head and the azimuth angle of data recorded on the recording medium, the azimuth loss can be reduced to the minimum, Good playback is possible.

In this embodiment, the signal from the reproduction head B, that is, the central reproduction head of the reproduction head unit 21 is used as the reference, but the signal from any other reproduction head may be used as the basis.

Further, in this embodiment, the reproducing head unit is composed of three reproducing heads, but any number of reproducing heads may be used as long as a plurality of reproducing heads are used.

At this time, if the number is large, the azimuth loss can be further reduced.

Alternatively, the signal from each reproducing head may be amplified by a reproducing amplifier and then guided to the delay circuit.

In this embodiment, the azimuth angles of the plurality of playback heads are the same, and the caps are arranged on the same straight line. However, since the playback circuit can correct this, even if the azimuth angles and gap positions are slightly different, I don't mind.

[Effects] As is clear from the above description, according to the present invention, a plurality of playback heads are stacked to form one playback head unit,
Since a configuration is adopted in which the signals from each playback head are delayed so that the sum of the signals from each playback head is maximized, the azimuth angle of the playback head
Even if there is an error between the azimuth angle of data recorded on the recording medium, azimuth loss can be reduced and good reproduction can be performed.

Furthermore, data recorded on a recording medium at any azimuth angle can be reproduced with small azimuth loss.

Another advantage is that the azimuth angle can be positioned with coarse precision when attaching the reproducing head to the magnetic recording device.

[Brief explanation of drawings]

1 and 2 illustrate one embodiment of the present invention. FIG. 1 is a perspective view of a reproducing head, FIG. 2 is a block diagram of a reproducing circuit, and FIG. 3 is a perspective view of a conventional reproducing head. 4 are block diagrams of conventional reproducing circuits. 7.8,12,13.17.18...Core half-day 9.1
4.19...Coil 10,15.20...Magnetic gap 11.16...Shield plate 21...Reproduction head units A, B, C...Reproduction head wJ1 Figure 4

Claims (1)

[Claims] A playback head unit formed by stacking a plurality of playback heads each functioning independently, a circuit for delaying the playback signal of each of the plurality of playback heads, and detecting the phase of the playback signal of each playback head, 1. A magnetic head device comprising: a circuit for controlling the phases so that they are in the same phase.