JPH0772925B2 - Magnetic recording device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording device, and more particularly to a magnetic recording device suitable for improving the data transfer rate of magnetic information to a magnetic medium.

[Background of the Invention]

With the increase in capacity of magnetic recording devices, it has become necessary to increase the data transfer rate of magnetic information to magnetic media.

The data transfer rate of the magnetic recording device is the product of the bit density on the magnetic medium and the relative speed between the magnetic medium and the magnetic head. Therefore, in order to increase the data transfer rate, either the bit density or the above You have to increase the relative speed.

In order to increase the bit density, it is necessary to develop a magnetic medium having excellent electric characteristics. Further, the increase in the relative speed has a problem of damage due to sliding between the magnetic medium and the magnetic head.

Therefore, there has been a demand for a method of increasing the data transfer rate without increasing the relative speed between the magnetic medium and the magnetic head while maintaining the current magnetic medium and bit density.

In a conventional magnetic recording device, there is no precedent device having a plurality of magnetic heads suitable for simultaneously recording and reproducing a plurality of signals in order to double the data transfer rate of magnetic information.

As a magnetic recording device provided with a plurality of magnetic heads, for example, there is one described in Japanese Patent Publication No. 59-44697, which is for obtaining a control signal for improving the positioning accuracy during reproduction. Yes, no consideration was given to improving the data transfer rate.

[Object of the Invention]

The present invention has been made in view of the above-mentioned conventional state of the art, and it is possible to improve the data transfer rate of magnetic information without increasing the bit density on the magnetic medium and the relative speed between the magnetic medium and the magnetic head. The purpose is to provide such a magnetic recording device.

[Outline of Invention]

A magnetic recording apparatus according to the present invention comprises a magnetic head assembly for recording and reproducing magnetic information on a magnetic medium, a control circuit for inputting / outputting magnetic information, and a movement control means for the magnetic head assembly. In a magnetic recording device provided with, the control circuit is provided with a circuit that divides a serial input signal into a plurality of serial signals, and a circuit that integrates a plurality of serial signals into a serial signal, and divides the plurality of serial signals respectively. A plurality of magnetic heads capable of independently recording and reproducing are mounted on the same magnetic head assembly whose movement is controlled by the movement control means.

The concept of developing the present invention will be described below.

The data transfer rate of the magnetic recording device is the product of the writing density (bit density) of magnetic information on the magnetic medium and the relative speed between the magnetic medium and the magnetic head. It is possible to increase the density or increase the relative speed.

However, the bit density of current magnetic recording devices is limited due to the electrical performance of magnetic media such as magnetic disks. In addition, the increase in relative velocity has a practical limit because of the risk of damage due to sliding between the magnetic head and the magnetic medium.

On the other hand, with the increase in capacity of magnetic recording devices, the data transfer rate of magnetic information is not satisfactory at present (for example, 3 Mbit / sec in large magnetic disk devices).

For this reason, it has become necessary to improve the data transfer rate without increasing the bit density and relative speed.

Therefore, it was considered to divide the serial data sent at the clock time T by the clock time of T / n and extend the signal connection time by using the peak hold circuit so that the signal is carried on the clock time of nT.

The signal generated in this way becomes an n-column signal having a clock time that is n times the clock time of the first signal.

Next, the signals of the n columns are independently sent to the n magnetic heads at the same time, and n signals are sent to one sync signal (index signal).
・ Record in sequence with a time interval of T.

For reproduction, the reverse operation is performed. That is, the signals read from the n magnetic heads are converted into n.T
Sampling with clock time T at time intervals of
That is, the signal duration is shortened.

The output signal of the clock time T is synthesized by adding the sampled signals of n columns, and the reproduction is completed.

As a result, the data transfer rate can be improved while keeping the bit density at 1 / n. That is, the data transfer rate is increased by n times while maintaining the current bit density.

Although the above method can be applied only to an electric circuit,
There are problems to be solved in realizing the individual magnetic head. When multiple magnetic heads are assigned to the magnetic heads used in the conventional device, the positioning of each magnetic head can be controlled individually and the signals can be written on the medium having different magnetic properties. Can be considered.

This easily causes a difference in the S / N ratio and the output voltage between the signals divided into the n columns, and an error is likely to occur in the signal combination at the time of reading.

Further, when the movement control of a plurality of magnetic heads is performed by different movement control means, there is a problem in accuracy when the recording density in the moving direction of the magnetic heads (for example, the track density of the magnetic disk) is increased. Occur.

In order to avoid these problems, it is desirable that the magnetic head is provided with a magnetic head at a position as close to the same magnetic medium (for example, a magnetic disk) as possible to perform movement control by one movement control means.

In order to satisfy such a requirement, one magnetic head assembly which is controlled to move by one movement control means is equipped with n magnetic heads so as to maintain the azimuth angle. By providing this azimuth angle, it is possible to reduce mutual interference when reading adjacent magnetic information, and it is possible to integrate and install a plurality of magnetic heads.
For example, for a magnetic disk, one track can be divided and used by a plurality of magnetic heads without widening the current track width.

By integrating the magnetic heads, the divided signals can be recorded at extremely close positions on the same magnetic medium, and the difference between the output signals can be reduced.

Further, the movement control of a plurality of magnetic heads can be performed by one movement control means, and even when the track density is further increased, it is sufficient to increase the precision of movement control for one magnetic head assembly. There is no need to match the precision between them.

Example of Invention

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

1 is a block diagram showing the main structure of a magnetic recording apparatus according to an embodiment of the present invention, and FIG. 2 is a perspective view of a magnetic head assembly used in the magnetic recording apparatus of FIG. FIG. 3 is a plan view of the magnetic head assembly.

In FIG. 1, 1 is a magnetic head assembly, 2 and 2'are a plurality of magnetic heads (two in this example), 3 is a movement control means, and the magnetic heads 2 and 2'are the same magnetic head 1. The magnetic head 1 mounted on the top of the magnetic head 1 is movement-controlled by one movement control means 3.

4,4 'are write amplifiers related to a circuit for supplying a recording current to the windings of the magnetic heads 2,2', and 5,5 'are modulation reproduction amplifiers connected to the write amplifiers 4,4', respectively. Circuit (read amplifier in the block of Fig. 1), 6
Is a clock, and 7 and 7'are the modulation and reproduction amplifier circuits, respectively.
Peak hold circuits connected to 5, 5 ', and 8, 8'are signal division circuits connected to the peak hold circuits 7, 7', respectively. It is divided by the clock 6.

Reference numerals 9 and 9'represent a sampling circuit for reproduction connected to the modulation and reproduction amplifier circuits 5 and 5 ', respectively, and 10 an adder circuit for integrating and outputting the signals of the sampling circuits 9 and 9'. Is.

Reference numeral 11 is a magnetic medium such as a magnetic disk, 12 is position detecting means for detecting the operating position of the magnetic medium 11, and 13 is an index circuit for sending a timing signal to the clock 6.

The serial input signal is divided into two series of serial signals through the signal dividing circuits 8 and 8'controlled by the clock 6. This signal has its signal duration extended by the peak hold circuits 7, 7 ', passes through the modulation reproduction amplifier circuits 5, 5', is sent to the write amplifiers 4, 4 ', and is magnetic media by the magnetic heads 2, 2'. Written and stored in 11.

On the other hand, the signals read by the magnetic heads 2, 2'are
Sampling circuit 9, 9'through modulation reproduction amplifier circuit 5, 5 '
The signal holding time is thereby shortened, and the adder circuit 10 restores the output signal corresponding to the original serial input signal.

The movement of the magnetic medium 11 is detected by the position detecting means 12,
It is configured to send an index signal, that is, a timing signal through the index circuit 13.

FIG. 2 is a perspective view of the magnetic head assembly 1.

The central rear part is equipped with two magnetic heads 2,2 '. The two magnetic heads 2 and 2'hold the azimuth angle θ as shown in FIG.

Next, the operation of this embodiment will be described with reference to FIG.
This will be described with reference to FIG.

FIG. 4 is a clock diagram of input / output signals in the magnetic recording apparatus of FIG. 1, and FIG. 5 is an explanatory diagram of a magnetic recording pattern.

In synchronization with the clock signal 102, serial data related to magnetic information is input in order from the index signal 101.

This serial input signal is converted to 1 by the signal division circuit 8, 8 '.
It is divided into two serial signals of 03 and 104. At this time, the duration of the signal remains T.

The two series serial signals 103 and 104 are converted into a signal 104 whose signal duration is set to 2T by the peak hold circuits 7 and 7 '.
Change to 105. This signal is sent to the write amplifiers 4, 4'through the modulation / reproduction amplifier circuits 5, 5 ', and recorded on the magnetic medium 11 by the magnetic heads 2, 2'.

On the other hand, the serial signal divided into two series can be reproduced as the original signal 102 by reading and adding in synchronization with the timing signal of the index signal 101.

The signals 104 and 105 shown in FIG. 49 are recorded by the magnetic heads 2, 2 ', in close proximity with an azimuth angle, as can be seen, for example, in FIG.

The density of the recording signal corresponds to the clock time 2T, and the transfer speed twice as high as that in the case of reading the signal of the same recording density can be achieved.

As described above, by providing the magnetic head assembly 1 with the magnetic heads 2, 2'provided with an azimuth angle, the two magnetic heads 2, 2'can be arranged close to each other, and the conventional magnetic head 2 ' The track of the magnetic medium 11 (for example, a magnetic disk) used in the head can be used in the two magnetic heads 2 and 2 ', the track density is substantially doubled, and the storage capacity is also doubled.

According to this embodiment, the bit density of the magnetic medium, the magnetic medium,
The data transfer rate of magnetic information can be increased without increasing the relative speed between the magnetic heads.

In the above-described embodiment, an example in which two magnetic heads are mounted on the magnetic head assembly has been described, but the number of magnetic heads is not limited to two.

In addition, the above-mentioned embodiment, as shown in FIG. 1 and FIG.
Although the magnetic disk device has been exemplified, it goes without saying that the present invention is not limited to this, and can be applied to a magnetic storage device such as a magnetic drum device or a magnetic tape device.

〔The invention's effect〕

As described above, according to the present invention, the bit density on the disk-shaped magnetic medium and the magnetic medium are improved by the improvement of a part of the magnetic head assembly constituting the magnetic recording device and the configuration of the control circuit. Without increasing the relative speed with the magnetic head,
The data transfer rate of magnetic information can be improved, and as a result, the storage capacity can be increased with a simple configuration.

[Brief description of drawings]

FIG. 1 is a block diagram showing the main configuration of a magnetic recording apparatus according to an embodiment of the present invention, FIG. 2 is a perspective view of a magnetic head assembly used in the magnetic recording apparatus of FIG. 1, and FIG. FIG. 4 is a plan view of the magnetic head assembly, FIG. 4 is a clock diagram of input / output signals in the magnetic recording apparatus of FIG. 1, and FIG.
It is explanatory drawing of a magnetic recording pattern. 1 ... Magnetic head assembly, 2, 2 '... Magnetic head, 3 ...
... Movement control means, 6 ... Clock, 7,7 '... Peak hold circuit, 8,8' ... Signal division circuit, 9,9 '... Sampling circuit, 10 ... Adding circuit, 11 ... Magnetic medium ,13……
Index circuit.

Claims (1)

[Claims] 1. A magnetic head assembly for recording and reproducing magnetic information on and from a disk-shaped magnetic medium, a control circuit for inputting / outputting the magnetic information, and a movement control means for the magnetic head assembly. In a magnetic recording apparatus provided with the magnetic head assembly, a slider, the movement of which is controlled by the movement control means, and a plurality of magnetic heads provided close to each other while holding an azimuth angle on the slider. The control circuit divides the serial input signal into a plurality of serial signals by a clock, and gives each signal from the signal division circuit a signal duration by a clock and outputs the signal to each magnetic head. A peak hold circuit, a sampling circuit for shortening the signal holding time of a read signal from each of the magnetic heads by a clock, and a sampling circuit The magnetic recording apparatus, characterized in that is constituted by an adding circuit for outputting a signal corresponding to the serial input signal by adding a signal from the ring circuit.