JP2000057507A - Magnetic disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the limit of a write frequency from being restrained by the length of a lead wire by providing an IC circuit, which supplies a write current to a magnetic head, on a suspension member for supporting the magnetic head. SOLUTION: An IC element 110 is mounted on a suspension 103 while a magnetic head 12 is mounted at the tip end of a suspension 103 that supports the head and an arm 101. The parallel wiring line 107 connected to this IC 110 is constituted of parallel write data lines and plural reproducing data lines. In addition, the IC 110 is connected to a control signal line 108 other than these data lines and that a wiring 109 is connected on the magnetic head 12 side of the IC 110. By positioning this IC circuit near the magnetic head 12, a distance can be shortened from the terminal to the magnetic head, and the loss problem concerning rise in frequency can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus used for an electronic computer, an information processing apparatus, and the like, and more particularly to a magnetic disk apparatus suitable for realizing a large-capacity recording.

[0002]

2. Description of the Related Art A semiconductor memory and a magnetic memory are mainly used as storage (recording) devices of information equipment. Semiconductor memory is used for the internal storage device from the viewpoint of access time,
A magnetic memory is used for an external recording device from the viewpoint of large capacity and non-volatility. Today, the mainstream of magnetic memory is on magnetic disks and magnetic tapes. In the recording media used for these, a magnetic thin film is formed on an Al substrate or a resin tape. In order to write magnetic information on these recording media, a functional unit having an electromagnetic conversion function is used. Also, in order to reproduce magnetic information, a magnetoresistance phenomenon or
A functional part utilizing a giant magnetoresistance phenomenon or an electromagnetic induction phenomenon is used. These functional units are provided in an input / output component called a magnetic head.

FIG. 3 shows a basic configuration of a magnetic disk drive. 1A shows a plan view of the device, and FIG. 1B shows a cross-sectional view. The recording medium 11 is directly connected to the motor 10 and rotates. The magnetic head 12 can move on the recording medium surface. Therefore, the magnetic head is supported by the rotary actuator 13 via the arm 101. The suspension 103 has a function of pressing the magnetic head 12 against the recording medium 11 with a predetermined load. A predetermined electric circuit is necessary for processing the reproduction signal and inputting / outputting information.
These are attached to the case 102.

The magnetic head 12 generates a magnetic field based on electrical information, and writes magnetic information on a recording medium by the magnetic field. At the time of reproduction (at the time of reading), the magnetic flux from the magnetic information in the recording medium is converted into an electric signal by using an electromagnetic conversion effect or a magnetoresistance effect.

[0005] In a conventional magnetic recording apparatus, a circuit board 103 mounted in a case 102 as shown in FIG.
From the integrated circuit (IC) 104 mounted on the
5, an electric signal (inversion of the current polarity corresponding to the write information) was transmitted to the magnetic head 12. Conversely, the reproduced electric signal was transmitted to the IC 104 via the lead wire 106.

When the IC 104 is mounted on the circuit board 103 provided on the magnetic disk drive main body as described above, the length of the lead wires 105 and 106 is 30 to 50 mm. The frequency of the electrical signal for writing and reading in a conventional magnetic recording device is at most about 100 MHz,
No problems related to the above line occurred.

[0007]

The performance of a storage device is determined by the speed at the time of input / output operation and the storage capacity. To improve product competitiveness, it is essential to shorten the access time and increase the capacity. In order to satisfy this requirement, first, it is necessary to increase the frequency of a write operation that requires reversal of the current polarity. In order to satisfy this requirement, studies for improving the electrical characteristics of the magnetic head have been made. Specifically, in order to improve the responsiveness under high frequency conditions, measures to use a film having a high specific resistance as the magnetic film used for the magnetic path (core), and to reduce the load on the drive circuit, This is a measure to shorten the length.

It has been confirmed that, by implementing these measures, a recording operation can be performed even if the recording frequency is increased to 150 MHz.

In order to enhance product competitiveness, it is necessary to further increase the frequency. For this purpose, the specific resistance of the magnetic path must be 45 μm.
A magnetic head with a resistance of Ωcm or more was prototyped. However, desired high-speed writing could not be realized. In pursuit of this cause, it was found that there was no problem in the magnetic head main body, and there was a problem in the line transmitting the high-frequency write current. This problem can be solved by shortening the length of the lead wire existing between the magnetic head and the IC circuit. However, it has been found that the magnetic disk drive requires a lead wire having a length at least as long as the radius of the recording medium, and thus the conventional structure has limitations.

An object of the present invention is to disclose a new magnetic disk structure in which the limit of the writing frequency is not limited by the length of the lead wire. It is another object of the present invention to clarify the possibility of a magnetic recording device that realizes writing at a frequency of 200 MHz or more using the same structure.

[0011]

In order to achieve the above object, the present invention uses the following means.

First, at least a magnetic disk drive was composed of a magnetic recording medium and a magnetic head having means for writing and reproducing the recording medium. In particular, an IC circuit for supplying a write current to the magnetic head was provided on a suspension member supporting the magnetic head, and a plurality of data transfer lines were also provided.

Similarly, at least a magnetic disk drive is constituted by a magnetic recording medium and a magnetic head having means for writing and reproducing data to and from the recording medium, and in particular, supplies a write current to the magnetic head on an arm member supporting the magnetic head. An IC circuit and a plurality of data transfer lines are provided.

Here, the switch circuit of the write current polarity and the parallel data are converted into serial data (time series) in the IC circuit.
At least a circuit for performing the operation is provided.

Alternatively, at least a magnetic disk drive is constituted by a magnetic recording medium and a magnetic head having means for writing and reproducing data to and from the recording medium. In particular, the magnetic head is joined to a suspension member via an IC element for supplying a write current. did.

Here, a plurality of data transfer lines are provided on a suspension member having an IC element to which a magnetic head is joined.

A magnetic disk drive driven at a recording frequency of 200 MHz or more is realized by selectively or combinedly applying the above-described configuration.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIG. The figure shows the magnetic head 12, the suspension 103 supporting the magnetic head 12, and the tip of the arm 101.
These basic configurations are the same as those of the conventional example shown in FIGS. In the present invention, the IC element 11
There is a feature in that 0 is mounted.

Further, a line 107 connected to the IC 110
Is composed of a plurality of data lines. Data line 1
Reference numeral 07 includes at least a parallel data line for writing and a plurality of data lines for reproduction.

Further, a control signal line 108 other than these data lines is connected to the IC 110. The control signal line 108 includes at least a power supply line, a ground line (zero potential line), an IC control signal line, a reference clock signal line, and the like.

A line 109 is connected to the IC 110 on the side of the magnetic head 12. The line 109 includes at least a line for supplying a write current to the magnetic head and a line for transmitting a reproduction signal from the magnetic head.

A feature of the present invention resides in that a plurality of data lines are provided on the suspension 103. In order to realize this function, as shown in FIG. 5A, a circuit 30 capable of inputting parallel data and converting it into serial data is provided in an IC bonded to a suspension. The basics of this device are LS151
It is an IC circuit called. According to the element, terminals 32, 3
The parallel data from 3, 34, and 35 can be output from terminal 36 as serial data (time-series data). This process requires a reference clock, which was input from terminal 31.

Specifically, the operation of the above circuit is as follows. Assuming that the terminal 32 has information "1", the terminal 32 has information "1", the terminal 33 has
When information “0” is input to terminal 34, information “0” is input to terminal 34, and information “1” is input to terminal 35, “100” is input from terminal 36.
Time series information corresponding to 1 "is output.

In the present invention, a current switch circuit 43 is provided at the subsequent stage of the circuit 30 as shown in (b), and information from a terminal 36 is input to the circuit from a terminal 37. The circuit 43 is supplied with a recording current from the terminal 38 and has a function of switching the current polarity in accordance with information from the terminal 37.
As far as this function is concerned, there is also a conventional writing IC.

A write current is supplied from terminals 40 and 41 to the coil of the magnetic head. Above the magnetic head
By locating the IC circuit, the distance from the terminals 40 and 41 to the magnetic head can be shortened, and the problem of loss associated with the increase in frequency can be reduced. By the way, in the above circuit, the terminal 39 is connected to the ground. The terminal 39 is a terminal on the outflow side with respect to the current supply terminal 38. Therefore, it is also possible to use it at a negative potential.

According to the above configuration, the writing frequency can be limited to a short line from the terminals 40 and 41 near the magnetic head to the magnetic head. Therefore, the problem related to the higher frequency can be solved as described above.

According to our experiments, when the IC was provided on the suspension and the data line was a single line, it was easily affected by noise. By parallelizing the write data lines as in this embodiment, the signal frequency can be reduced to 1 / n (n: the number of parallelizations). From this effect, the load on the circuit system can be reduced, and a circuit resistant to noise can be constructed at low cost.

It is easily understood that the same effect can be obtained even when the data lines on the reproduction side are parallelized. The present invention does not distinguish between these effects. That is, it includes a configuration in which one or both of the write data line and the read data line are parallelized.

In the above embodiment, the IC circuit was mounted on the suspension. However, the same effect was observed when the IC was mounted on the arm member supporting the suspension. In this case as well, it goes without saying that a plurality of data transfer lines are provided on the arm member. In this example,
The distance between the magnetic head and the IC is inevitably longer than in the above embodiment (see FIG. 3). Therefore, it is inevitable that it is inferior to the above embodiment from the viewpoint of increasing the frequency.

Next, a second embodiment will be described with reference to FIG.
This example is characterized by the positional relationship between the IC 111 and the magnetic head 12. That is, as shown in FIG.
Are connected to the suspension 103 via the IC 111. This is seen from the direction indicated by the arrow, as shown in FIG. That is, the IC element 111 is attached to the suspension 103.
And the magnetic head 12 is joined to the IC element 111 via the adhesive surface 112. Magnetic head 12
Is provided close to the recording medium 11.

FIG. 3C is an enlarged view showing the relationship between the magnetic head and the IC element in FIG. Magnetic head 1
2 can be seen as being adhered on the surface of the IC 111.
The IC 111 is provided with a terminal 116 for a write current signal and a terminal 116 for a reproduction signal, and the terminal and the terminal of the magnetic head 12 are electrically connected. In addition, the above IC111
Is provided with an input / output terminal for parallel data, a power supply terminal, a control terminal, and the like 115.

Needless to say, in order to implement the writing of magnetic information, the magnetic head 12 is provided with a magnetic pole 117 for generating a write magnetic field on the recording medium surface side.
Further, in the case of the present embodiment in which the area of the magnetic head element 12 is extremely smaller than that of the IC element 111, the pad 114 is newly bonded as shown in FIG.
It is also possible to improve the performance of approaching the recording medium. To realize this function, the pad 114 is provided with a taper 118 on the inflow end side.

Also in the second embodiment described above, a plurality of data transfer lines are provided on a suspension member having an IC element to which a magnetic head is joined. This solves the problem related to high frequency.

The new effect of the present embodiment is that the manufacturing cost of the magnetic head can be kept low. The magnetic head is manufactured by the same lithography method as that for the semiconductor element. In order to reduce the manufacturing cost, it is necessary to fabricate many devices in a single wafer. If this effect is maximized, the devices will be miniaturized to the extent that the flying characteristics of the magnetic head are sacrificed. However, by adopting the form as in the present embodiment, the problem relating to the flying characteristics can be solved even if the element is miniaturized.

Further, since the distance between the IC element and the magnetic head is close to the limit, the problem related to the high frequency can be completely solved.

By applying the above-described suspension system and magnetic head configuration to a magnetic disk drive, it is possible to solve the problem related to line loss caused by increasing the recording frequency. From this effect, a desired recording and reproducing operation can be realized even when the recording frequency is increased to 200 MHz or more. This effect is difficult in the prior art having a large line loss, and is first realized by the present invention.

[0037]

According to the present invention, it is possible to solve the problem relating to line loss caused by increasing the recording frequency, and to provide a magnetic disk drive capable of realizing desired recording and reproducing operations even when the recording frequency is increased to 200 MHz or more.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a main part of a magnetic head for a magnetic disk and a suspension configuration according to the present invention.

FIG. 2 is a conceptual diagram showing a relationship between a conventional magnetic head and a line.

FIG. 3 is a conceptual diagram of a conventional magnetic recording device.

FIG. 4 is a conceptual diagram showing a second embodiment of the present invention.

FIG. 5 is a diagram showing an example of a circuit configuration enabling the present invention.

[Explanation of symbols]

12 ... magnetic head, 11 ... recording medium, 103 ... suspension, 101 ... arm, 13 ... rotary actuator, 10 ...
Motor, 102 ... case, 109 ... wiring, 110, 111 ... IC, 107
... Parallel wiring path, 108 ... Signal line, 103 ... Substrate, 105,106
... wiring paths, 32, 33, 34, 35, 31, 36, 37, 40, 41 ... terminals, 30 circuits, 114 pads, 118 tapers, 105 terminals, 116 terminals.

Claims (9)

[Claims] An IC circuit for supplying a write current to a magnetic head on a suspension member that supports the magnetic head, comprising: a magnetic disk device having a magnetic recording medium and a magnetic head that writes and reproduces information using the medium. A magnetic disk drive comprising a plurality of data transfer lines. 2. The magnetic disk drive according to claim 1, wherein said IC circuit includes a switch circuit of write current polarity and a circuit for converting parallel data into serial data. 3. The magnetic disk drive according to claim 1, wherein the magnetic disk drive is used at a recording frequency of 200 MHz or higher. 4. An IC circuit for supplying a write current to a magnetic head on an arm member for supporting the magnetic head, wherein the IC circuit has a magnetic recording medium and a magnetic head for writing and reproducing information using the medium. A magnetic disk drive comprising a plurality of data transfer lines. 5. The magnetic disk drive according to claim 4, wherein said IC circuit includes a switch circuit of write current polarity and a circuit for converting parallel data into serial data. 6. The magnetic disk drive according to claim 4, wherein said magnetic disk drive is used at a recording frequency of 200 MHz or higher. 7. A magnetic disk drive having a magnetic recording medium and a magnetic head for writing and reproducing information using the medium, wherein the magnetic head is joined to a suspension member via an IC element for supplying a write current. A magnetic disk device characterized by the above-mentioned. 8. The magnetic disk drive according to claim 7, wherein a plurality of data transfer lines are provided on said suspension member. 9. The magnetic disk drive according to claim 8, wherein said magnetic disk drive is used at a recording frequency of 200 MHz or more.