JPH02168474A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To avoid temperature rise of a motor coil and to fulfill the normal function by arranging a metallic plate on the surface of the motor coil of a voice coil motor. CONSTITUTION:In the case of frequent positioning, since a current flows to a motor coil 55, heat due to the resistance of the motor coil 55 itself is caused. The heat is delivered to a metallic plate 1 with excellent thermal conduction and attached to the motor coil 55 and also delivered to an arm holder 53 or the like. Thus, the temperature rise in the motor coil 55 is avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device, and particularly to a magnetic disk device having a feature in a positioning portion of a magnetic head.

[Conventional technology]

Conventionally, a magnetic disk device is a storage device that is connected to a computer main body via a control device. The recording and reproducing portion is assembled into a magnetic disk, a magnetic head, a positioning section, and a disk rotation mechanism.

The conventional example will be explained below based on FIG.

In the conventional example shown in FIG. 2, there are a plurality of magnetic disks 51 for data recording stacked at regular intervals, and each magnetic disk 51 inserted between these magnetic disks 51
A magnetic head 52 that writes or reads data on the surface.
an arm holder 53 that attaches and fixes the magnetic head 52 in a comb shape and moves each magnetic head 52 as necessary; and a permanent arm that drives the arm holder 53 and positions each magnetic head 52. magnet 54
and a voice coil motor 5 having a motor coil 55
7. The motor coil 55 is a permanent magnet 54
The magnetic circuit reciprocates within the magnetic circuit gap 56 sandwiched between the magnetic circuits.

Next, the operation will be explained.

A plurality of magnetic disks 51 for data recording stacked at regular intervals are rotated at high speed by an external force. The magnetic head 52 is inserted between these magnetic disks 51 to write or read data on each magnetic disk 51 surface. At this time, positioning must be performed to move the magnetic head 52 to a required position on the surface of the magnetic disk 51. This positioning is achieved by reciprocating the motor coil 55 of the voice coil motor 57 in the magnetic circuit gap 56 created by the permanent magnet 54 to drive the arm portion 53A protruding from the arm holder 53. As a result, the magnetic head 52 is moved to an arbitrary location.[Problem to be solved by the invention] However, in the above conventional example, when positioning is frequently performed, current is applied to the motor coil of the voice coil motor. The drawback was that heat was generated due to the resistance of the coil itself. In addition, because the heat generated in the motor coil is not cooled down sufficiently, this heat generates gas from the adhesive that adheres the coil, and it adheres to the magnetic disk surface and magnetic head, preventing normal function. was occurring.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic disk device that can overcome the disadvantages of the conventional example and can function normally.

[Means to solve the problem]

The present invention includes a plurality of magnetic disks for data recording stacked at regular intervals, a magnetic head inserted between these magnetic disks to write or read data on each magnetic disk surface, and a comb-shaped magnetic head. The magnetic head is provided with an arm holder that is attached and fixed to the magnetic head and moves each of the magnetic heads as necessary, and a voice coil motor that has a permanent magnet and a motor coil that drives the arm holder and positions each of the magnetic heads. . Then, a method is adopted in which a metal plate is disposed on the surface of the motor coil of the voice coil motor. This aims to achieve the above-mentioned objective.

[For production]

A plurality of magnetic disks for data recording, which are stacked at regular intervals, are rotated at high speed by an external force. A magnetic head is inserted between these magnetic disks to write or read data on each magnetic disk surface. At this time, positioning must be performed to move the magnetic head to a required position on the magnetic disk surface. This positioning is achieved by reciprocating the motor coil of the voice coil motor in a magnetic circuit gap created by a permanent magnet, driving the arm protruding from the arm holder, and as a result, the magnetic head can be moved arbitrarily. The event will be held after being moved to a new location. During positioning, which is frequently performed, current flows through the motor coil of the voice coil motor, generating heat due to the resistance of the coil itself. The heat generated in the motor coil is quickly transferred to a metal plate provided to cover the motor coil and dissipated.

[Embodiments of the invention]

Conventionally, magnetic disk devices have been used as external storage devices for computers to record large amounts of information, and their mission has been to accurately transfer arbitrary information at high speed.

Therefore, its main performance is storage capacity, access time, data transfer time, etc., as well as its reliability.

There are various factors that affect reliability, and one of the major factors is positioning. Two types of mechanisms are generally used for this positioning mechanism: a linear type and a rotation type.

Next, an embodiment of the present invention will be explained based on FIG. In addition, regarding the same components as the conventional example described above,
The same symbols will be used.

Here, a rotary positioning mechanism will be explained.

In the embodiment shown in FIG. 1, a plurality of magnetic disks 51 for data recording are stacked at regular intervals, and each magnetic disk 5 is inserted between these magnetic disks 51.
A magnetic head 5 that writes or reads data on one surface.
2, an arm holder 53 for attaching and fixing this magnetic head 52 in a comb shape and moving each of these magnetic heads 52 as necessary; and a permanent arm for driving this arm holder 53 and positioning each magnetic head 52. Voice coil motor 57 with magnet 54 and motor coil 55
It is equipped with The metal plate 1 is disposed on the surface of the motor coil 55 of the voice coil motor 57.

This will be explained in further detail. With the increase in storage capacity, a plurality of magnetic disks 51 are stacked one on top of the other at a constant interval. During this time, the magnetic head 52 is attached to the arm holder 53 via a head arm 58 in a comb shape. The arm holder 53 has a cylindrical shape, and is rotatably supported by a spindle so as to cover a pivot shaft 60 fixed to a frame 59. Further, on the outer surface of the arm holder 53, an arm portion 53A for driving is provided.
is provided protrudingly, and a motor coil 55 of a voice coil motor 57 serving as a drive source is attached to the tip thereof. A metal plate 1 with good thermal conductivity is attached to the outer surface of the motor coil 55 in close contact with the outer surface of the motor coil 55.

Next, the voice coil motor 57 will be further explained.

The performance required for magnetic head positioning is high speed and high precision. Therefore, a voice coil motor 57 is generally used. The voice coil motor 57 is a so-called linear motor, and is composed of a permanent magnet 54 and a motor coil 55 for generating a -like magnetic flux in the air gap. By passing a current through the motor coil 55, the motor coil 55 moves linearly within the magnetic circuit gap 56. Since the force generated in the motor coil 55 is proportional to the current flowing through the motor coil 55, the magnetic head 52 can be moved to a required position by adjusting the current flowing through the motor coil 55.

Next, the operation will be explained.

A plurality of magnetic disks 51 for data recording stacked at regular intervals are rotated at high speed by an external force. The magnetic head 52 is inserted between these magnetic disks 51 to write or read data on each magnetic disk 51 surface. At this time, positioning must be performed to move the magnetic head 52 to a required position on the surface of the magnetic disk 51.

This positioning is performed by moving the motor coil 55 of the voice coil motor 57 through the pivot shaft 60,
The arm holder 53 is rotated by driving the arm portion 53A protruding from the cylindrical arm holder 53 by reciprocating the magnetic circuit gap 56 created by the permanent magnet 54 in an arc shape. As a result, the magnetic head 5
2 is moved to an arbitrary location. During positioning, which is frequently performed, current flows through the motor coil 55, which generates heat due to the resistance of the motor coil 55 itself. This heat is transmitted to the metal plate 1 with good heat transmission attached to the motor coil 55, and further flows to the arm holder 53 and the like. Therefore, an increase in the temperature of the motor coil 55 can be avoided.

Although the explanation has been limited to a rotary type positioning mechanism here, the present invention is not limited to a rotary type positioning mechanism. This can have several effects.

〔Effect of the invention〕

As explained above, according to the present invention, when positioning is frequently performed, current flows through the motor coil, which accompanies heat generation due to the resistance of the motor coil itself. It is transmitted to a metal plate with good transmission, and then flows to an arm holder, etc. Therefore, it is possible to avoid an increase in the temperature of the motor coil, and the normal function of the motor coil will not be hindered by the gas generated from the adhesive used to bond the motor coil due to the motor coil becoming high temperature. It is possible to provide an unprecedented magnetic disk drive device that is highly reliable.

[Brief explanation of the drawing]

FIG. 1(A) is a sectional view showing one embodiment of the present invention, FIG. 1(B) is a plan view of the motor coil of this embodiment, and FIG.
) is a sectional view of FIG. 1(B), FIG. 2(A) is a sectional view of the conventional example, FIG. 2(B) is a plan view of the conventional motor coil, and FIG. 2(C) is a sectional view of the conventional example. FIG. 2 is a cross-sectional view of FIG. 2(B). l...Metal plate, 50...Positioning part,
51...Magnetic disk, 52...Magnetic head, 53...Arm holder, 54...
...Permanent magnet, 55...Motor coil, 57.
...Voice coil motor. Patent applicant: Japan Electric Co., Ltd. Agent: Isamu Takahashi, patent attorney

Claims (1)

[Claims] (1) A plurality of magnetic disks for data recording stacked at regular intervals, a magnetic head inserted between these magnetic disks to write or read data on each magnetic disk surface, and a comb-shaped magnetic head. an arm holder that is attached and fixed to the magnetic head and moves each of the magnetic heads as necessary; and a voice coil motor that has a permanent magnet and a motor coil that drives the arm holder and positions each of the magnetic heads. A magnetic disk device, characterized in that a metal plate is disposed on a surface of a motor coil of the voice coil motor.