JPS62291764A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To relieve the load of a circuit and a CPU and to increase the recording capacity by stopping the deceleration at a guard band region by a motor and using a clash stopper only made of an elastic body so as to decelerate a head arm. CONSTITUTION:When a magnetic head 14 fitted to a head arm 13 reaches a guard band 12, the head arm 13 is abutted on the clash stopper 15 just after several tracks. In this case, even if the magnetic head 14 is given the guard band 12, no current in the decelerating direction flows to a head arm drive motor 16. Further, a rubber 37 of the clash stopper 15 is fixed to a spring 38 and the spring 38 is subjected to pre-load by a pre-load guide 39, since the magnetic head 14 is given in the guard band 12, since a nearly deceleration force is given to the head arm 13, number of tracks of the guard band 12 is less and the recording capacity is increased.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method for decelerating a head arm in a guard band area of a magnetic disk drive.

[Conventional technology]

As shown in FIG. 2, the crash stopper of a conventional magnetic disk drive consists of a sufficiently wide guard band 22 and a crash stop rubber 27. When the magnetic head 24 enters the guard band 22, the head arm A current flows through the drive motor 26 in the direction of deceleration, causing the head arm 23 to stop. Here, the guard band refers to a portion provided on the outer periphery of the data area.

Further, the crash stop rubber 27 is provided to prevent the head arm 23 from exceeding the guard band in the event of an electrical system failure.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional technology, the shorter the access time of the drive, the wider the guard band width is required, resulting in a significant reduction in the number of data tracks and the storage capacity. Furthermore, with the miniaturization of magnetic disk drives, this problem became a much bigger problem as the diameter of the disk became smaller.

In addition, the conventional method of stopping the head arm by applying a current in the deceleration direction to the head arm drive motor using a guard band requires a CPU that operates at high speed as the access time becomes faster, which is extremely expensive. become. Furthermore, when dealing with hardware, there is a drawback that the circuit becomes complicated.

Additionally, as mentioned above, the method of stopping the head arm by applying a current in the direction of deceleration to the head arm drive motor using a guard band does not work if the head arm does not function properly due to an electrical system failure or disturbance such as noise. , the biggest drawback was that the probability of head crash was extremely high.

The present invention is intended to solve these problems, and its purpose is to provide a magnetic disk that has a large capacity per magnetic disk device, reduces the burden on the CPU and circuits, and has extremely high reliability even when the head arm goes out of control. It is located where the equipment is provided.

[Means for solving problems]

In the magnetic disk device τ of the present invention, guard bands are arranged on the inner and outer circumferential sides of the data trunk of the magnetic disk, and in the guard band area, the head arm is decelerated only by a crash stopper made of an elastic body. It is characterized by

[For production]

According to the above configuration of the present invention, by suppressing the maximum acceleration during deceleration by the crash stopper made of a spring and rubber to the limit acceleration at which the magnetic head does not crash,
The guard band can be made significantly narrower. With conventional methods, it has been impossible to set the acceleration during deceleration to the limit acceleration that will not cause a crash due to insufficient motor torque.

Furthermore, regardless of electrical system failures or noise, high reliability is always achieved against crashes.

〔Example〕

FIG. 1 is a plan view of an embodiment of the present invention, in which a magnetic disk 11 has a guard band 12. In FIG.

The 6ff air hand 14 attached to the head arm 13 is
Once inside the guard band 12, the head arm 13 comes into contact with the crash stopper 15 immediately after several steps. At this time, even if the magnetic head 14 enters the guard band 12, the head arm drive motor 1
6. Current in the direction of deceleration does not freeze.

As shown in FIG. 3, in the crash stop 7 pa 15, when the rubber 37 is fixed to the spring 38 and the spring 38 is preloaded by the preload guide 39, the crush stop 7 pa 15 is magnetically driven! 4 is guard band 1
2, a substantially flat deceleration force is applied to the head arm 13 as shown in FIG.

〔Effect of the invention〕

As described above, according to the present invention, the recording capacity is increased by stopping the deceleration by the motor in the guard band area and decelerating the head arm only by the crash stopper made of an elastic body. This has the tremendous effect of significantly reducing the load on the circuit and significantly increasing reliability against head crashes during runaway.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a magnetic disk device of the present invention. FIG. 2 is a plan view showing a conventional magnetic disk device. FIG. 3 is a plan view of a crash stopper used in the magnetic disk device of the present invention. FIG. 4 is a diagram showing the relationship between deflection and deceleration force obtained by the crush stopper used in the magnetic recording device of the present invention. 11... Magnetic disk 12... Guard band 13... Head arm 14... Magnetic head 15... Crash stopper 16... ...Head arm drive motor 22...
... Guard band 23 ... Head arm 24 ... Magnetic head 26 ... Head arm drive motor 27 ...
...Crash stop rubber 37...Rubber 38...Spring 39...Preload guide and above Applicant Seiko Epson Co., Ltd. Agent Patent attorney Tsutomu Mogami and 1 other person Figure 2 Gun Figure 4 18

Claims (1)

[Claims] In a magnetic disk device having at least one magnetic disk and at least one magnetic head, and in which at least one surface of the magnetic disk is provided with a surface dedicated to servo information, an inner circumferential side and an outer circumferential side of a data track of the magnetic disk. A magnetic disk drive characterized in that a guard band is disposed in each of the guard band areas, and in the guard band area, the head arm is decelerated only by a crash stopper made of an elastic body.