JPS6282568A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To secure a large distance between the center of the rotary shaft of an arm and a magnetic head and to reduce the yawing angle, by setting each rotary shaft at each specific position. CONSTITUTION:A capstan 6, a pivot 5 and a spindle motor 2 are disposed so as to satisfy 90 deg. <= angle CPS < 180 deg.. An arm 10 can freely oscillate around the pivot 5 within a range of the angle CPS. A magnetic head 3 is set to the arm 10 so as to satisfy CP<HP. The capstan 6 is revolved counterclockwise by a stepping motor 7 when a magnetic disk 1 is revolved by the motor 2. In such a case, the right side of a steel belt 13 is taken up to the capstan 6 as shown in the figure. Thus the arm 10 is turned counterclockwise round the pivot 5 and therefore the head 3 moves toward the outer circumference side from the inner circumference side of the disk 1.

Description

[Detailed description of the invention] [Industrial application field] This invention applies to magnetic disk devices.

[Conventional technology]

FIG. 2 shows a conventional magnetic disk device disclosed in Japanese Unexamined Patent Publication No. 59-58670. In the figure, (1) is a magnetic disk, (2) is a spindle motor for rotating the magnetic disk (11), and (3) is a device for writing and reading information in the form of electrical signals on the magnetic disk (1). (4) is a swinging arm to which the magnetic head (3) is fixed and rotates and swings around a pivot (5); (6) is a capstan; (7) is a capstan (6);
A stepping morph directly connected to the steel belt (
8) to transmit the driving force to the arm (4). (9) shows a spring for applying constant tension to the steel belt (8).

Next, the operation will be explained. The magnetic disk (1) is rotated by a spindle motor (2) at, for example, 3600 revolutions per minute.

On the other hand, the stepping motor (7) rotates the capstan (6), and the driving force of the stepping motor (7) is transferred to the arm (4) via the steel belt (8) which is given constant tension by the spring (9). The deceleration is transmitted to. As a result, the arm (4) swings around the pivot (5) and is positioned at a predetermined position on the magnetic disk (1). This allows the magnetic head (3) to write information on the magnetic disk and read information that has already been written.

[Problem that the invention seeks to solve]

Since the conventional head positioning device is configured as described above, it is not possible to ensure a sufficiently large rotation radius of the magnetic head (3) in a magnetic disk device with restrictions on external dimensions.
The angle (hereinafter referred to as yaw (YAW) angle) between the tangent to the track where information is read/written on the magnetic disk (1) and the main axis (running direction) of the magnetic head (3) must be within the permissible range (e.g. 8 degrees). ), the inner zone on the magnetic disk (1) cannot be used. Therefore, since only the outer peripheral side of the magnetic disk (1) is used, there is a problem that the storage capacity per magnetic disk (1) is reduced.

This invention was made in order to solve the above-mentioned problems, and its purpose is to obtain a magnetic disk device equipped with a head positioning device that can also be used on the inner circumferential side of the magnetic disk within the allowable range of the yaw angle. do.

[Means for solving problems]

In the magnetic disk device according to the present invention, the center of the rotational axis of the arm is P, the center of the rotational axis of the capstan is C1, the center of the rotational axis of the magnetic disk is S, and the position of the magnetic head on the arm is H. When - of each rotating axis is 90'≦
The magnetic head is arranged so that 1qPs<180°, the magnetic head is arranged at a position where CP<HP, and the arm is configured to swing within the PS around point P.

[For production]

In this invention, since the distance between the center P of the rotation axis of the arm and the position H of the magnetic head can be increased, the yaw angle can be made sufficiently small even on the inner peripheral side of the magnetic disk.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, (1) to (31) and (51 to (7)) are the same as before. C is the center of the rotation axis of the capstan (6);
P is the rotation center of the pivot (5), S is the center of the rotation axis of the spindle motor (2), and H is the position of the magnetic head.

Note that the capstan (6), the pivot (5), and the spindle motor (2) are arranged in a relationship such that 900≦ and PS<180°. α[ is an arm that can swing freely around the pivot (5), and swings within the same angle range of PS. Note that the magnetic head (3) is provided on the arm 00) so that C7<HF.

01) is a flexible L-shaped support member whose one end is fixed to the arm (101 with a bolt (2), and (+3) is a flexible steel wrapped around the capstan (6). It is a belt, and one end is a bolt (1 → supporting member (11)
The other end is fixed to the arm 00) with a bolt (15).

Next, the operation will be explained. In FIG. 1, when the magnetic disk (1) is being rotated by the spindle motor (2),
Capstan (6) by stepper motor (7)
When is rotated counterclockwise, the steel belt (+3)
Since the right side of the figure is caught in the capstan (6), the arm αα rotates counterclockwise about the pivot (5), so that the magnetic head (3) is attached to the magnetic disk (1).
move from the inner circumference side to the outer circumference side. In this case, since the steel belt (+3) is elastically supported by the support member (11), a constant tension is always applied to it, so that it responds to the rotation of the capstan (6). In addition, in order to move the magnetic head (3) from the outer circumferential side to the inner circumferential side, the stepping motor (7) may be rotated clockwise in the opposite direction to the above.

Note that the same effect can be expected even if a continuous rotation motor such as a DC torque motor is used in place of the stepping motor (7) of the above embodiment.

Furthermore, it can be applied not only to magnetic disks but also to optical disk devices and magneto-optical disk devices.

〔Effect of the invention〕

As described above, according to the invention of Party B, the position of each rotating shaft is 9.
The magnetic head was arranged so that 0'≦1qPS<1800, and the magnetic head was arranged so that CP<HP, and the magnetic head was configured to swing within 1jqPs around the rotation axis P. Since the distance between the center of the rotating shaft and the magnetic head can be increased, the yaw angle can be reduced.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing a conventional magnetic disk device, and FIG. 2 is a configuration diagram of a magnetic disk device showing an embodiment of the present invention. In the figure, (1) is the magnetic disk, (2) is the spindle motor, (3) is the magnetic head, (5) is the pivot, (6) is the capstan, is the arm, (+3) is the steel belt (driving force transmission member), P is the pivot (5
), C is the rotation center of the capstan (6), and S is the rotation center of the capstan (6).
is the rotation center of the spindle motor (2), which is the rotation center of the magnetic disk (1). H is the position of the magnetic head (3). Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] (1) An arm to which a magnetic head is fixed is arranged so as to be able to swing around a first central axis of rotation, and is wound under constant tension around a capstan that rotates around a second central axis of rotation. Each end of a flexible driving force transmission member is fixed to the arm at a predetermined interval, and the arm is swung to a predetermined position of the magnetic disk that rotates about a third rotation axis. In the device that moves the magnetic head, the center of the first rotating shaft is P, and the center of the second rotating shaft is C.
, when the center of the third rotation axis is S and the position of the magnetic head is H, the position of each rotation axis is 90°≦■
The magnetic head is placed so that PS<180°, and the magnetic head is placed at a position where @CP@<@HP@, so that the magnetic head swings within ■PS around point P. A magnetic disk device characterized by comprising: