JPH06176312A - Thin type magnetic disk device - Google Patents

Abstract

PURPOSE:To provide the thin type magnetic disk device which saves electric power by eliminating the movement of a head or extremely lessening the movement, drastically decreases the loss of the time heretofore required for the movement of the head and can reduce the size over the entire part of the device. CONSTITUTION:A head array 3 is constituted of plural heads formed by joining plural thin films consisting of magnetic materials and plane coils. The head of the array 3 is disposed to face the tracks of a magnetic memory medium 2. The movement of the head is eliminated or the movement is, therefore, extremely lessened, by which the electric power is saved in the case the magnetic memory medium 2 is subjected to reading out of data and writing of data. In addition, the size over the entire part of the device is reduced. The heads may be provided at every other several tracks or the adjacent heads may be disposed by changing their directions 90 deg. if the magnetic memory medium is of a high density and the spacings between the respective tracks is narrow.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin magnetic disk device for storing data by using a rotating magnetic medium such as a floppy disk or a hard disk. The present invention relates to a thin magnetic disk device in which the head movement is eliminated or reduced by allocating a head for each track or every other track, thereby reducing the size of the entire device and saving power.

[0002]

2. Description of the Related Art Floppy disk or hard disk
In a magnetic disk device that uses a rotating magnetic medium such as a disk for storage, conventionally, one head is
It was driven by a motor or the like to be moved to a target track, and after the vibration due to the movement was stabilized, data reading or writing was performed.

Therefore, a large amount of electric power is required when driving the step motor, and as described above, the time required for moving the head to the target track and the time until the vibration due to the movement stabilizes. It was necessary and the data read / write speed was slow.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to remedy the above-mentioned drawbacks of the prior art. It eliminates the step motor to eliminate the movement of the head or reduces the movement very much. Power saving, and greatly reduce the loss of time required to move the head.
It is an object of the present invention to provide a thin magnetic disk device capable of downsizing the entire device.

[0005]

In order to solve the above-mentioned problems, the invention of claim 1 of the present invention is a magnetic disk device provided with a head for writing data to a magnetic medium and reading data from the magnetic medium. A plurality of heads formed by joining a plurality of thin films composed of a body and a plane coil are provided facing a track of a magnetic storage medium.

According to a second aspect of the present invention, in the first aspect of the invention, a head driving means for moving the head by n tracks is provided, and a head made of a thin film is provided for each n tracks of the magnetic storage medium. It is a thing. According to a third aspect of the present invention, in the first aspect of the invention, adjacent heads are arranged with their directions turned by about 90 °.

[0007]

According to the first aspect of the present invention, since a plurality of heads formed by joining a plurality of thin films composed of a magnetic material and a planar coil are provided facing the tracks of the magnetic storage medium, a plurality of heads are provided. The movement of the head can be eliminated or the movement can be reduced very much, so that the power saving can be achieved and the time loss required for the movement of the head can be significantly reduced. Further, the head can be made compact and have a high density, and the device can be made compact.

According to the second aspect of the present invention, the head drive means for moving the head by n tracks is provided, and the head is provided for every n tracks of the magnetic storage medium. All tracks can be accessed even if the distance between the tracks is narrow. In the invention of claim 3 of the present invention, the adjacent heads are arranged at about 90 °.
Since the magnetic storage medium is arranged with the orientation changed, the influence can be minimized even when the density of the magnetic storage medium becomes extremely narrow and the spaces between the tracks become extremely narrow and the magnetic interference between the heads becomes a problem.

[0009]

1 is a diagram showing the overall structure of a magnetic disk device according to an embodiment of the present invention. FIG. 1 (a) is a top view of the magnetic disk device, and FIG. 1 (b) is a side view of the magnetic disk device. Shows. In the figure, 1 is a magnetic disk device, 2 is a magnetic storage medium on which data is written or read by a head rotated by a medium rotation motor or the like (not shown), 3 is formed of a thin film, and is composed of a plurality of heads. Head array. It should be noted that in FIG. 1, a motor for rotating the storage medium, a circuit board for controlling reading and writing of data of the magnetic disk device, etc. are omitted. 2A and 2B are views showing the configuration of the head array 3 formed of the thin film shown in FIG. 1, in which FIG. 2A is a top view of the head array, and FIG. 2B is a view of FIG. A front view of the heads of m tracks and m + 1 tracks of the head array viewed from the A direction, and (c) is a side view of the same head viewed from the B direction.

In the figure, 2 is a magnetic storage medium having 0 to n tracks and moving in the direction of the arrow in the figure, 3 is 3-
A head array having n + 1 heads of 0 to 3-n, 3a is a writing or reading flat coil provided in each head 3-0 to 3-n, 3b is a magnetic body of the head, and 3c is each head. It is an insulating / protective layer provided.

As shown in the figure, a plurality of heads 3-0
The head array 3 is composed of
Each head 3-0 to 3-n faces each track 1 to n of the magnetic storage medium 2. Then, a write current is applied to the coils 3a of the heads 3-0 to 3-n to move the magnetic storage medium 2 in the direction of the arrow in FIG.
Data is written in the magnetic storage medium 2, and the magnetic storage medium in which the data is written is moved in the arrow direction of FIG.
Data is read from the -n coil 3a.

3A and 3B are views showing an example of an assembling method of the head array 3, in which FIG. 3A shows each thin film forming the head array 3, and FIG. It is the figure which looked at what joined each thin film from the side. In the figure, 3a is a plane coil, a shaded portion 3b is a magnetic material, 3c is an insulating / protective layer, 31 to 34 are heads,
Each thin film forming the array 3 is shown.

To assemble the head array 3 formed of the thin film of this embodiment, as shown in FIG. 3, the magnetic substance 3b is attached to the thin film 31 formed of the magnetic substance in the central portion and the lower portion in advance. A thin film 32 having a plurality of plane coils 3a printed thereon is joined around the magnetic body 3b in the central portion. Next, the magnetic body 3b is attached to the central portion, and the thin film 33 formed of an insulator is joined to the joined body of the thin film 31 and the thin film 32. Further, the thin film 34 formed of the magnetic body 3b is joined to the joined body of the thin films 31, 32, and 33.

As described above, each thin film 31, 32, 33,
After bonding 34, the outer side of the bonded body of the respective thin films is covered with the insulating / protective layer 3c as shown in FIG. 3B to obtain a head array composed of a plurality of heads. FIG. 4 is a diagram showing the first and second embodiments of the read / write circuit for the head array 3.

In the first embodiment shown in FIG.
Is a digital system that controls reading of data from the magnetic storage medium and writing of data to the magnetic storage medium,
Reference numeral 42 is an analog integrated circuit, 42a is a head amplifier having a bidirectional characteristic for amplifying a read signal from the magnetic storage medium and a write signal to the magnetic storage medium, and 42b is a multiplexer which can be switched by the output of the digital system 41. , The output of the multiplexer 42b is connected to the heads 3-0 to 3-n shown in FIGS.

In the figure, when reading data from the magnetic storage medium, the read currents from the heads 3-0 to 3-n are given to the analog integrated circuit 42 and switched by the output of the digital system 41.
It is selected by b and supplied to the head amplifier 42a. The head amplifier 42a amplifies the read signal from the head selected by the multiplexer 42b,
It is given to the digital system 41. The digital system 41 processes the output of the head amplifier 42a to obtain a read digital signal.

When writing data to the magnetic storage medium, the digital signal output from the digital system 41 is amplified to a proper current value by the head amplifier 42a and given to the multiplexer 42b. Multiplexer 4
2a is switched according to the output of the digital system 41, and a write current is supplied to the corresponding head. In the present embodiment, the output of the digital system 41 is used to output the multiplexer 42.
Since b is switched, only the target track of the magnetic storage medium can be accessed.

FIG. 2B shows a second embodiment. In the drawing, the same components as those shown in FIG. 4A are designated by the same reference numerals, and in this embodiment, In the case where the digital system 41 is highly integrated and parallel processing is possible, a plurality of head amplifiers 42a-1 to 42a-n are provided and a selection switch means 42c is provided to enable simultaneous writing and reading to a plurality of tracks. An example is shown.

In the figure, 41 is a digital system for controlling the reading of data from the magnetic storage medium and the writing of data to the magnetic storage medium, 42 is an analog integrated circuit, and 42a-1 to 42a-n are magnetic storages. A head amplifier having a bidirectional characteristic for amplifying a read signal from the medium and a write signal to the magnetic storage medium, and 42c is a selection switch unit which is switched by the output of the digital system 41, and the output of the selection switch unit 42c is shown in FIG. , Heads 3-0 to 3-n shown in FIG.

In the figure, when data is read from the magnetic storage medium, read currents from the heads 3-0 to 3-n are given to the analog integrated circuit 42 and selectively turned on by the output of the digital system 41. Head amplifier 42a-1 selected by switch means 42c
Through 42a-n. Head amplifier 42a
-1 to 42a-n amplify the read signal from the head selected by the changeover switch means 42c,
It is given to the digital system 41. The digital system 41 processes the outputs of the head amplifiers 42a-1 to 42a-n to obtain a read digital signal.

When writing data to the magnetic storage medium, the digital signal output from the digital system 41 is amplified to an appropriate current value by the head amplifiers 42a-1 to 42a-n and given to the changeover switch means 42c. To be The changeover switch means 42c is selectively turned on by the output of the digital system 41, and a write current is passed to the corresponding head.

In this embodiment, since a plurality of head amplifiers and changeover switch means are provided, as described above, when the digital system 41 is highly integrated and parallel processing is possible, simultaneous writing to a plurality of tracks is performed. , Can be read. As described above, in the embodiment shown in FIGS. 1 to 4, the head array composed of a plurality of heads corresponding to each track of the magnetic storage medium reads data from the magnetic storage medium or magnetic storage. Since data is written to the medium, head driving means such as a stepping motor for moving the head is not required, power can be saved, and reading can be performed.
The writing speed can be improved.

Since the head array composed of a plurality of heads is made of a thin film, the head array can be downsized. FIG. 5 is a diagram showing a second embodiment of the head arrangement in the present invention. In the figure, 51-0 to 51-n are heads of a head array provided for every other track of the magnetic storage medium, and 52 is a piezoelectric element for moving the head in the direction of the arrow by the width of one head. is there.

In the figure, when reading data from the magnetic storage medium or writing data to the magnetic storage medium, the heads 51-0 to 51-n are moved by one track by the piezoelectric element 52. A target track of the magnetic storage medium is selected and read or write is performed. In the present embodiment, the heads are provided every other track, so that even if the magnetic storage medium has a high density and the tracks are extremely narrow, writing of data to and reading of data from all tracks can be performed. It can be carried out.

In the above embodiment, the heads are provided every other track, but if the magnetic storage medium has a high density and the tracks are narrower, the heads may be provided every several tracks. it can. FIG. 6 is a diagram showing a third embodiment of the head arrangement in the present invention. In FIG. 6, 61n to 61n + 2 are heads of the head array, and 62n to 62n + 2 are gaps of the heads. Are heads 61n through 61
An example is shown in which the direction of n + 2 is changed by 90 ° for attachment.

In this embodiment, even if the magnetic recording medium becomes high-density and the space between the tracks becomes extremely narrow and magnetic interference between the heads becomes a problem, the directions of the heads 61n to 61n + 2 are changed by 90 °. Since it is attached, its influence can be minimized.

[0027]

As is apparent from the above description,
In the present invention, since a plurality of heads configured by joining a plurality of thin films composed of a magnetic body and a planar coil are provided facing the tracks of the magnetic storage medium, the heads are eliminated or the movement of the heads is minimized. It is possible to reduce power consumption by reducing the amount of time, and it is possible to significantly reduce the loss of time required to move the head and improve the reading and writing speed.

Further, since the step motor can be omitted and the head can be made high in density, the entire apparatus can be downsized.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall configuration of a magnetic disk device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a head array formed of a thin film.

FIG. 3 is a diagram showing an example of a method of assembling a head array.

FIG. 4 is a diagram showing an embodiment of a data read / write circuit.

FIG. 5 is a diagram showing a second embodiment of the head arrangement according to the present invention.

FIG. 6 is a diagram showing a third embodiment of the head arrangement according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 magnetic disk device 2 magnetic storage medium 3 head array 3a writing and reading plane coil 3b magnetic material of head 3c insulating / protecting layer provided on each head 41 digital system 42 analog integrated circuit 42a, 42a-0, 42a- 1, 42a-n Head amplifier 42b Multiplexer 42c Changeover switch means 52 Piezoelectric element

Claims (3)

[Claims] 1. A magnetic disk device comprising a head for writing data to a magnetic medium and reading data from the magnetic medium, the head comprising a plurality of thin films composed of a magnetic body and a planar coil, the thin film comprising: A thin magnetic disk device comprising a plurality of heads each composed of a plurality of heads, the heads being arranged opposite to the tracks of the magnetic storage medium. 2. A thin magnetic disk drive according to claim 1, further comprising a head drive means for moving the head by n tracks, wherein a head composed of a thin film is provided for every n tracks of the magnetic storage medium. 3. The thin magnetic disk drive according to claim 1, wherein adjacent heads are arranged with their directions turned by about 90 °.