JPH064845A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To eliminate the influence of the bending force of a flexible wire which is of a problem in the case of miniaturization of a magnetic disk. CONSTITUTION:The signal which is heretofore transmitted and received by the flexible wire is transmitted and received by substituting the flexible wire with a rotary transformer consisting of primary coil channels 12, 13 and secondary coil channels 14, 15, by which the bending force of the flexible wire is decreased. The servo treatment for moving and positioning a head is easier than with the conventional flexible wire.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device used as an external storage device of a computer.

[0002]

2. Description of the Related Art In recent years, notebook computers have been attracting attention due to the trend toward miniaturization in the field of computers. Along with this, the magnetic disk device, which is a component of a computer, is also becoming smaller and lighter. The history of miniaturization of magnetic disk devices can be seen in the miniaturization of disk diameter. Starting from 14 inches, 8 inches, 5 inches,
The diameter is steadily decreasing to 3.5 inches, 2.5 inches, and 1.8 inches.

There have been various technological innovations in the process of miniaturization. For example, change from linear access arm to rotary access arm, change from servo surface servo system to data surface servo system, and dramatic improvement in the degree of integration of electrical circuits (edited by Japan Electronic Industry Development Association, small hard disk drive) See Glossary). Looking at the history of the past, there are generations whose mechanical structures have changed significantly and those whose processing methods have changed significantly. In the process of shifting from the 3.5-inch type to the 2.5-inch type, there were few mechanical structural changes. Therefore,
The mechanical structure is almost the same except that the dimensions are different.

An example of the mechanical structure most often used in the above-mentioned conventional magnetic disk drive will be described below with reference to the drawings. FIG. 4 is a mechanical structure diagram when the conventional magnetic disk device is viewed from the direction perpendicular to the surface of the magnetic recording medium. In FIG. 4, 1 is a head for recording / reproducing information on / from a magnetic recording medium, 2 is a slider for flying the head, 3 is a flexure for controlling the head flying characteristics, and 4 is a signal transmitted / received from the head. To a head amplifier, 5 is a head amplifier for amplifying a signal reproduced from the head, 6 is a disk which is a magnetic recording medium rotated by a spindle motor (not shown), 7 Is an arm for supporting the head, 8 is a voice coil motor (hereinafter referred to as VCM) for driving the arm, 9 is an arm rotation center, and 10 is a support base for supporting the whole.

The operation of the conventional disk device thus constructed will be described below. The disk 6 rotates on the support base 10. The head 1 is floated above the disk 6 by the slider 2 and forms a track in the circumferential direction. Further, the head 1 is moved by an arm 7 which rotates about an arm rotation center 9, and forms a cylinder in the radial direction of the disk 6. VCM as a power source for rotating the arm 7
8 is used. The electric signal transmitted / received to / from the head 1 is connected to the head amplifier 5 via the flexible wire 4. The signal passing through the flexible wire 4 generally includes two types of signals for connecting the head 1 and the head amplifier 5 and a signal for driving the VCM 8.

[0006]

However, if the conventional structure as described above is used to reduce the size, the bending force of the flexible wire becomes relatively large, which makes it difficult to perform accurate head positioning. Had a problem.

In view of the above problems, it is an object of the present invention to provide a magnetic disk device capable of relatively reducing or eliminating the bending force of a flexible wire.

[0008]

In order to solve the above problems, the magnetic disk device of the present invention uses at least a portion between the head 1 and the head amplifier 5 among the signals which are conventionally transmitted and received using a flexible wire. The radio using a transformer is used for the signals to be combined.

[0009]

With the above structure, it is possible to reduce the influence of the bending force of the flexible wire, which is a problem when miniaturizing the magnetic disk device.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is a sectional view of an arm rotation center of a magnetic disk device showing an embodiment of the present invention, FIG. 2 is a view showing electrical connection between a head and a head amplifier in the magnetic disk device, and FIG. 3 is an arm including a VCM part. It is sectional drawing of a rotation center part. In FIG. 1, 7 is an arm, 9 is an arm rotation center, 12 is a channel A of a primary coil transformer,
13 is the channel B of the primary coil transformer, 14 is the channel A of the secondary coil, and 15 is the channel B of the secondary coil. The primary coil transformer is on the arm 7 side, and the secondary coil transformer is on the support base 10 side. Each is installed. Further, 17 is a bearing, 18 is a flexure mounting hole, and 16 is a magnetic shielding member. In FIG.
Reference numeral 1 is a head, 4 is a flexible wire, 5 is a head amplifier, 11 is a transformer, 12 is a primary coil channel A, and 14 is a secondary coil channel A. In FIG. 3, 20 is a magnet attached to the arm 7 side, and 21 is a coil attached to the support base 10 side.

The operation of the magnetic disk device having such a structure will be described below with reference to FIGS. 1, 2 and 3. FIG. 1 is a cross-sectional view of an access arm cut along the arm rotation center of a magnetic disk device. The arm 7 is connected to a support base 10 by a bearing 17, and the bearing 17 causes the arm 7 to rotate around the arm rotation center 9. Rotate about. 1 differs from the conventional example in that it includes a primary coil channel A12, a primary coil channel B13, a secondary coil channel A14, and a secondary coil channel B15. The channels of these coils are covered by the magnetic shield member 16, and the channels A12 and B13 of the primary coil and the channel A1 of the secondary coil adjacent thereto are provided.
4 and a channel B15 form a wireless rotary type transformer.

In FIG. 2 showing the electrical connection between the head 1 and the head amplifier 5, the circuit diagram shown in FIG. 2 (a) shows the conventional electrical connection and is shown in FIG. 2 (b). The circuit diagram shows the electrical connection of the transformer composed of the primary coil and the secondary coil configured in FIG. In the conventional configuration,
As shown in FIG. 2A, a flexible wire 4 is used between the head 1 and the head amplifier 5. However, in this embodiment, as shown in FIG. 2B, the transformer 11 is used instead of the flexible wire 4 so that the bending force generated by the flexible wire 4 is eliminated. In general, when one disc 6 is used, both sides are used. In FIG. 1, there is one disk 6 and one head 1 on each side. In FIG. 1, the description of channel A and channel B corresponds to a total of two heads, one on each surface, and the number of channels is required to correspond to the number of heads. With the above configuration, of the signals included in the flexible wire 4 that has been conventionally used, the signal that couples between the head 1 and the head amplifier 5 can be deleted.

Generally, the signal included in the flexible wire 4 includes a signal for driving the VCM 8. FIG. 3 is a cross-sectional view showing a configuration for deleting this signal. As shown in FIG. 3, the flexible wire 4 can be completely removed by fixing the magnet 20 on the arm 7 side and arranging the coil 21 on the support base 10 side.

When miniaturizing the magnetic disk device, there are some portions whose dimensions can be simply reduced in proportion and some portions which cannot be simply reduced. In particular, the flexible wire 4 has a problem that the inner conductor cannot be made thin even if its size is made small. Therefore, the influence of the bending force of the flexible wire 4 increases as the size is reduced. According to this embodiment, the influence of the bending force of the flexible wire 4 can be reduced or eliminated.

[0015]

As described above, according to the present invention, of the signals that are conventionally transmitted and received using a flexible wire,
By using a transformer for the signal that couples between the head and the head amplifier, the effect of reducing the bending force of the flexible wire can be obtained. Further, by fixing the magnet on the arm side and arranging the coil on the support base side, the effect of being able to completely eliminate the influence of the flexible wire is obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of an arm rotation center portion in a magnetic disk device according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing an electrical connection between a head and a head amplifier.

FIG. 3 is a sectional view of an arm rotation center portion including a VCM portion in the magnetic disk device according to the embodiment of the present invention.

FIG. 4 is a mechanical structural diagram of a conventional magnetic disk device.

[Explanation of symbols]

 1 head 2 slider 3 flexure 5 head amplifier 6 disk 7 arm 10 support base 11 transformer 12 primary coil channel A 13 primary coil channel B 14 secondary coil channel A 15 secondary coil channel B 16 magnetic shielding member 17 bearing 18 flexure Mounting hole 20 Magnet 21 Coil

Claims (2)

[Claims] 1. A magnetic recording medium, a spindle motor for rotating the magnetic recording medium, a head for recording / reproducing information on / from the magnetic recording medium, and a head for moving the head in a radial direction of the magnetic recording medium. An access arm, a support base for supporting the rotation center axis of the spindle motor and the rotation center axis of the access arm, a primary coil arranged on the access arm side, and a primary coil arranged close to and on the support base side. A secondary coil and a transformer including these primary and secondary coils, which is configured to wirelessly transmit / receive a recording / reproducing signal transmitted / received by a head through the primary coil and the secondary coil. And a magnetic disk device. 2. A magnet is provided on the side of the access arm and a coil is provided on the side of the support base, and the access arm is driven by a magnetic coupling formed between the magnet on the access arm side and the coil on the support base. Claim 1 characterized in that
The magnetic disk device described.