JPH0574084A - Head unloading mechanism - Google Patents

Abstract

PURPOSE:To prevent the surfaces of a magnetic head and a magnetic disk from being damaged an external vibration. CONSTITUTION:When the magnetic head is unloaded, the tip part 11 of a head unloading member 9 engaged with a head arm 4 is engaged with a solenoid 15. By driving the solenoid 15, the tip part 11 is pushed down, another tip part 10 touching a suspension 3 is rotated, the suspension 3 of the magnetic head 2 is lifted and unloaded. Thus, the surfaces of the magnetic head and the magnetic disk are prevented from being damaged without interfering the access operation of the magentic head.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head unloading mechanism for a magnetic head in a magnetic disk device.

[0002]

2. Description of the Related Art In a conventional magnetic disk apparatus, a magnetic head contacts the surface of the magnetic disk when the apparatus is not in operation, and the magnetic head floats on the surface of the magnetic disk with a submicron gap during operation of the apparatus. A so-called contact start / stop (hereinafter abbreviated as CSS) method is known. Therefore, when a strong shock is applied from the outside when the device is not in operation, the magnetic head in contact with the surface of the magnetic disk jumps up and then re-collides with the surface of the magnetic disk, damaging the surface of the magnetic disk. There was a problem that it would end up. On the other hand, if left unattended for a long time,
There is also a problem that the surface of the magnetic disk and the suspension of the magnetic head are damaged due to the fact that the magnetic disk and the magnetic head are attracted to each other and an excessive force acts at the time of startup.

In order to solve such a problem, a head unload mechanism for holding the magnetic head in non-contact with the magnetic disk when not in operation is provided as disclosed in Japanese Patent Laid-Open No. 169377/1983. There is something.

[0004]

Although the above-mentioned known technique solves the problems described above, it has been found that another problem occurs. That is, when the magnetic head is unloaded, the head unload mechanism moves while sliding on the suspension of the magnetic head, so that the suspension part vibrates and the magnetic head and the magnetic disk strike at the moment when the magnetic head separates from the magnetic disk. It damages the surface of the magnetic disk.

The object of the present invention has been made in view of the above-mentioned problems. When the head is unloaded, the sliding operation of the magnetic head and the head unload mechanism is eliminated, and a stable and reliable magnetic head is provided. To realize unloading.

[0006]

In order to achieve the above object, a magnetic disk device of the present invention comprises means for driving a linear head unloading member and the head unloading member provided near the magnetic head positioning device. Equipped with.

The linear head unload member is made of, for example, a wire material for a spring, and is provided on the actuator in the vicinity of the magnetic head. The drive means for unloading the magnetic head is provided in the vicinity of the magnetic head positioning device, for example, on a base member that does not move when positioning the magnetic head.

[0008]

The head unload member moves together with the actuator even when the magnetic head is accessing the disk. However, the head unload member is movably held with respect to the head arm.

One end of the head unload member contacts the suspension, and the other end of the head unload member engages with the drive means of the head unload member, for example, a solenoid in the present invention, when the head is unloaded. Since the head unloading member does not engage with the solenoid when the magnetic head is accessed, the actuator is not affected. Further, since the position where the head unload member pushes up the suspension is constant, there is no suspension and stable head unloading operation is possible.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram of a magnetic disk recording apparatus showing an embodiment of the present invention. The magnetic disk 1 is clamped by a spindle (not shown) and rotatably supported by the base 16. The magnetic head 2 records / reproduces information on / from the magnetic disk 1. The magnetic head 2 is supported by the head arm 4 via the suspension 3 and is pressed against the magnetic disk 1 by an appropriate force by the elastic force of the suspension 3. When the magnetic disk 1 rotates at a high speed, the magnetic head 1 floats up due to the pressure of the air flow on the surface of the magnetic disk 1, and rises to a height that is just in balance with the pressing force of the suspension 3.

An actuator 5 supports a magnetic head assembly having the magnetic head 2, suspension 3, and head arm 4 having the above structure. The actuator 5 is
It is supported by a plurality of bearings 7 so as to be guided along the guide rail 8 in the radial direction (direction 21) of the disk.
A voice coil 6 is attached to the rear of the actuator 5. The voice coil is inserted into a magnetic gap of a magnetic circuit (not shown in FIG. 1) and generates an electromagnetic driving force. The generated electromagnetic driving force drives the actuator 5 for positioning along the radial direction of the disk (direction of arrow 21).

The head arm 4 is provided with a U-shaped groove 12, and the head unloading member 9 is housed along the groove 12. The head unloading member 9 is made of, for example, a spring wire rod, and has a substantially Z shape in which both ends are bent perpendicularly to the axis. The end portion 10 of the head unloading member 9 is arranged so as to be in contact with the lower portion of the suspension 3, and the other end portion 11 is bent in the opposite direction to the end portion 10 and protrudes from the actuator 5. In this example,
In order to apply a rotational force to the head unloading member 9 at the time of head unloading, one end other than the end contacting the suspension 3 is bent perpendicularly to the axis, and this part is driven. It is configured to be engaged with the means to give a rotational force.

A drive means utilizing a solenoid 15 is provided on the base 16, and the movable iron core 14 is supplied with an electric current.
Is moved upward in the arrow 22. When the disk device is operating, the movable iron core 14 is positioned on the upper side in FIG. 1 by energizing the solenoid 15, and when the device is stopped, the solenoid 15 is stopped.
Since the current to the solenoid 15 is cut off, the solenoid 15 is returned to the lower side in FIG. 1 by the force of a return spring (not shown) provided inside the solenoid 15. An engaging piece 13 projects from the end of the movable iron core 14. Actuator 5
, But when moved to the unloading zone of the magnetic head 2 (provided near the outer circumference of the magnetic disk, but not shown), the head unloading member 9 is moved.
The end portion 11 of the is cross-engaged with the engaging piece 13. When the energization to the disk device is stopped while the end 11 of the head unloading member 9 and the engaging piece 13 are cross-engaged with each other, the movable iron core 14 of the solenoid 15 is moved by the force of the return spring to the arrow 22. Return to the bottom. At this time, the engagement piece 13 is engaged with the end portion 11 of the head unloading member 9.
To push downward, the head unloading member 9 rotates about a main shaft arranged along the groove 12 in the direction of arrow 23. At this time, the tip of the end portion 10 of the head unload member 9 pushes the suspension 3 upward. Then, the magnetic head 2 separates from the magnetic disk 1, and the unloading is completed.

In the above series of operations, the tip of the end portion 10 of the head unloading member 9 is pushed up in the tangential direction of the suspension 3 when the suspension 3 is rotated, and there is almost no sliding contact between the suspension 3 and the suspension 3. Does not vibrate. Therefore, it is possible to prevent the magnetic head 2 and the magnetic disk 1 from colliding with each other and the surface of the magnetic disk 1 from being damaged.
Stable and reliable head unloading is possible.

Further, when the head unloading member 9 lifts the suspension 3, the relative positional relationship between the magnetic head 2 and the head unloading member 9 is always constant, so that the suspension 3 can be lifted at a constant position with high precision. You can

Further, in the head unloading mechanism of the present embodiment, only the light head unloading member 9 moves together with the actuator 5, so that the mass increase of the movable part is small and the high speed access operation cannot be prevented.

Further, since the head unloading member 9 is formed of the wire material for the spring, a slight dimensional tolerance of the head unloading member 9 is absorbed by the elastic deformation of the spring material, and high precision is not required. However, reliable unloading is possible.

[0019]

According to the present invention, the magnetic head can be stably and reliably unloaded with a simple structure without sliding on the suspension. Further, almost no mass is added to the movable portion of the actuator, and the high speed access operation of the magnetic head is not hindered.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a magnetic disk device showing a position embodiment of the present invention.

[Explanation of symbols]

2 ... Magnetic head, 3 ... Suspension, 4 ... Head arm, 9 ... Head unload member, 10/11 ... End portion of head unload member, 12 ... Groove portion, 13 ... Engaging piece, 15
... Solenoid, 16 ... Base, 21 ... Arrow indicating the access direction of the magnetic head, 22 ... Arrow indicating the moving direction of the iron core, 23 ... Rotation direction,

Claims (1)

[Claims] 1. A magnetic disk device comprising a magnetic head positioning device for supporting a magnetic head for recording / reproducing information on / from a magnetic disk recording medium via a suspension for pressing the magnetic disk recording medium with a predetermined force. A linear member and a driving means for driving the linear member, wherein one end of the linear member is in contact with the suspension and the other end is engaged with an engaging portion of the driving means. A head unloading mechanism for a magnetic disk recording apparatus, wherein the drive means that is rotatably supported by the magnetic head positioning device and that drives the linear member is provided near the magnetic head positioning device.