JPH0132213Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Technical Field of the Invention The present invention relates to a magnetic disk device that performs recording and reproduction on a medium that is rotationally driven by a magnetic head fixed to a rotary actuator mechanism.

(b) Prior Art and Problems A magnetic disk device that performs recording and reproduction on a disc-shaped recording medium using a rotary actuator mechanism having a magnetic head is constructed as shown in FIG. FIG. 1 is a plan view showing a schematic configuration of a conventional magnetic disk device.

A disk-shaped medium 1 is locked to a rotating shaft of a spindle mechanism 2, and is rotated in the direction of arrow A by rotation of the rotating shaft. On the other hand, the actuator mechanism 3 is formed by a shaft 3B that rotates in the direction of arrow B by a voice coil motor (not shown) and an arm 3A fixed to the shaft 3B. 4 to the magnetic heads 5A, 5
B is fixed. Therefore, the magnetic head 5A,
5B is levitated by a predetermined rotational speed of the medium 1,
Recording and playback are performed. The magnetic head 5A is used as a recording head for recording or reproducing, and the magnetic head 5B is used as a servo head for selecting a predetermined track to be recorded or reproduced.

However, in such a configuration, the recording surface of the medium 1 requires the same recording width for the data recording area for recording data and the servo area for selecting a predetermined track, so the data recording area for the recording surface is halved. It had some problems.

(c) Purpose of the invention The purpose of the invention is to eliminate the above-mentioned problems by shifting the fixed positions of the recording head and the servo head so that their respective rotation radii are different. .

(d) Structure of the invention The purpose of the invention is to provide such a magnetic disk device in which a recording head and a servo head are attached to the arm, and the recording head and the servo head are attached to the arm. This is achieved by a magnetic disk device characterized by having different rotation radii due to rotation.

(e) Example of the invention The invention will be explained in detail below with reference to FIG. 2.
FIG. 2 shows an embodiment of the magnetic disk device according to the present invention, in which a is a plan view and b is an explanatory view.

As shown in b, the arm 3C rotated in the direction of arrow B by the shaft 3B has a radius R1 from the center of the shaft 3B.
The servo head 5A and the recording head 5B are respectively fixed via the gimbal 4 so as to be located at a location with a radius of R2. With this structure, when the arm 3C is rotated in the direction of arrow B, the servo head 5A is moved in the direction of arrow C1 and the recording head 5B is moved in the direction of arrow C2. Therefore, on the recording surface of the medium 1, a servo area 1A with a width b1 and a data recording area 1B with a width b2 are formed. In this case, the rotation radius R1 of the servo head 5A
If is set to 1/2 of the rotation radius R2 of the recording head 5B, the width b1 of the servo area 1A becomes the data recording area 1B.
The width b2 can be reduced to 1/2, and the data recording area can be widened.

In addition, by providing a servo head 5A with a rotation radius R11 and two recording heads 5B with a rotation radius R12 from the shaft 3B, which is rotated as shown in b, the inner surface of the recording surface of the medium 1 is provided. A data recording area 1B having a width b4 can be formed on the side and outer side, and a servo area 1A having a width b3 can be formed between both data recording areas 1B. In this case, if the rotation radius R11 is set to 1/2 of the rotation radius R12, the width b3 of the servo area 1A will be 1/2 of the width b4 of the data recording area 1B, and the width b3 of the servo area 1A will be 1/2 of the total recording width. /4, data recording area 1B further than a
can be expanded.

If there are multiple media 1, multiple arms 3C are provided so as to face the recording surface of each media 1, so each arm 3C has a servo head 5A and a recording head 5A as described above. It can be applied by providing a head 5B,
The same effect can be obtained.

(f) Effect of the invention As explained above, the invention includes a servo head on the arm 3C so that the turning radius R1, R11 of the servo head 5A is smaller than the turning radius R2, R12 of the recording head 5B. 5A and a recording head 5B are installed together.

As a result, the widths b1 and b3 of the servo area 1A are smaller than the widths b2 and b4 of the data recording area 1B, and the data recording area 1B can be made wider than in the past, which has a great practical effect.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a conventional magnetic disk device, and FIG. 2 is a plan view of an embodiment of the magnetic disk device according to the present invention. In the figure, 1 is a medium, 2 is a spindle mechanism, 4 is a gimbal, 3 is an actuator mechanism, and 5
A, 5B are magnetic heads, 3A, 3C are arms, 3
B indicates an axis, 1A indicates a servo area, and 1B indicates a data recording area.

Claims (1)

[Scope of utility model registration request] A magnetic disk device comprising a rotationally driven medium, a recording head and a servo head for recording on or reproducing information from the medium, and an arm to which the recording head and the servo head are fixed and rotated, A magnetic disk device characterized in that the arm is provided with the recording head and the servo head, and the recording head and the servo head have different rotation radii due to the rotation of the arm. .