JPH0594682A - Floating magnetic head - Google Patents

Abstract

PURPOSE:To avoid danger of a head crash by inserting a piezoelectric element between a flexure and a slider. CONSTITUTION:The flexure 14 is attached at a tip of a load beam 10 and the piezoelectric element 24 is provided on the flexure 14 and besides the slider 16 having a magnetic core 26 is attached to the piezoelectric element 24 and a magnetic head is composed. At a stopped time of a rotation of a magnetic disk 22, a thickness of the piezoelectric element 24 is shrunk by a voltage impressed on the piezoelectric element 24 and the slider 16 is set at such a position that the slider is not allowed to contact with the magnetic disk 22. Also at an operating time, the magnetic disk 22 rotates at a regular speed and a voltage applied to the piezoelectric element 24 is suppressed by making it coincide with the generation of a high speed of air flow having a sufficient floating force. Thus a contact sliding between the magnetic head and the magnetic disk 22 is eliminated and the damage is avoided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floating magnetic head which moves relative to a magnetic disk while maintaining a minute space.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional example of a floating magnetic head. The floating magnetic head of this example moves relative to the magnetic disk while maintaining a minute space.
A slider 16 having a magnetic core 18 around which a coil 20 is wound is attached to the tip of the via a flexure 14. The other end of the load beam 10 is connected to a carriage or the like (not shown) of the drive device body via a mount 12.

In the floating magnetic head having the above structure, the slider 16 is in contact with the magnetic disk due to the spring action of the load beam 10 and the flexure 14 when the rotation of the magnetic disk is stopped. Then, as the magnetic disk rotates, a high-speed airflow is generated on the magnetic disk, the slider 16 floats above the magnetic disk, moves relatively to the magnetic disk while maintaining a minute space, and the magnetic core 1
At 8, magnetic recording and reproduction is performed. Then, when the rotation of the magnetic disk is stopped, the slider 16 comes into contact with the magnetic disk again.

[0004]

In the floating magnetic head in which the slider floats on the magnetic disk as described above,
When the magnetic disk is rotating at a constant speed, the slider is separated from the magnetic disk, but immediately after the magnetic disk starts rotating and immediately before it stops rotating, the airflow is not sufficient and the levitation force that acts on the slider. Is small, the slider comes into contact with the magnetic disk and slides. Such a sliding state not only damages the magnetic head and the magnetic disk, but may also cause an important loss of magnetic recording.
Further, the magnetic head may be attracted to the extremely smooth magnetic disk, and this attraction makes the flying posture of the slider and the rotation of the magnetic disk unstable.

The present invention has been made to solve the above problems, and prevents the contact between the magnetic head and the magnetic disk by providing a piezoelectric element between the flexure and the slider.

[0006]

The floating magnetic head of the present invention is a floating magnetic head in which a slider having a magnetic core is provided on a flexure at the tip of a load beam, and a piezoelectric element is provided between the flexure and the slider. It is characterized by being interposed.

[0007]

By applying a voltage to the piezoelectric element provided between the flexure and the slider, the piezoelectric element is expanded and contracted to adjust the distance between the slider and the magnetic disk. Therefore, even when the rotation of the magnetic disk is stopped or the magnetic disk is rotating at a low speed, the contact between the magnetic head and the magnetic disk can be prevented and the head crash can be avoided.

[0008]

1 shows a floating magnetic head according to an embodiment of the present invention. In the floating magnetic head shown in FIG. 1, the flexure 14 is attached to the tip of the load beam 10.
4, a piezoelectric element 24 is provided, and a slider 16 having a magnetic core 26 is attached to the piezoelectric element 24. At this time, even if a member such as an adapter is further provided between the flexure 14 and the load beam 10, the effect of the present embodiment can be obtained, which is naturally within the scope of the present invention. The load beam 10 and the flexure 14 made of aluminum or the like have a spring action and press the slider 16 toward the magnetic disk 22 side. When the slider 16 floats, this pressing force balances with the levitation force of the air flow to maintain an appropriate levitation amount. The magnetic core 26 around which the coil is wound generates a magnetic field when the magnetic head is operated, and performs recording / reproduction on the magnetic disk 22. The thin plate-shaped piezoelectric element 24 adhered to the slider 16 with an adhesive or the like is connected to an electric circuit (not shown) installed in the main body of the magnetic head device, and a voltage is applied to the piezoelectric element 24 to apply the piezoelectric element. Stretch 24.
The piezoelectric element 24 includes lead zirconate titanate (PZ
T), quartz, lithium niobate (LiNbO ₃ ) or the like can be used.

In the floating magnetic head of this embodiment, when the rotation of the magnetic disk 22 is stopped, a voltage is applied to the piezoelectric element 24 to shrink the thickness of the piezoelectric element 24 so that the slider 16 does not come into contact with the magnetic disk 22. Slider 1 in position
Set 6. Then, during operation, the magnetic disk 22 rotates at a constant speed, and the voltage applied to the piezoelectric element 24 is suppressed in accordance with the generation of a high-speed air flow having a sufficient floating force.
In this way, the slider 16 is floated while maintaining an effective flying height. Further, when the magnetic disk 22 is stopped, a voltage is applied to the piezoelectric element 24 again in accordance with the decrease in the high-speed air flow, the thickness of the piezoelectric element 24 is contracted, and the slider 16 is moved to the magnetic disk 22 when the magnetic disk 22 is stopped. Avoid contact. In this way, the magnetic head and the magnetic disk 22 can be prevented from coming into contact with each other when the magnetic disk is stopped, rotated at low speed, or rotated at high speed. Further, when the magnetic disk 22 rotates, the piezoelectric element 24
It is possible to finely adjust the flying height of the slider 16 (at the nanometer level) by finely adjusting the applied voltage instead of completely cutting off the voltage applied to.

Further, the position of the magnetic head is set so that the slider 16 keeps a minute space with the magnetic disk 22 in the state where no voltage is applied to the piezoelectric element 24 when the rotation of the magnetic disk 22 is stopped. Then, when the magnetic disk 22 rotates, a voltage is applied to the piezoelectric element 24 to extend the thickness of the piezoelectric element 24, and the slider 16 and the magnetic disk 2
The slider 16 can be floated on the magnetic disk 22 with the space between the two being an effective flying height.

The actual flying height of the slider 16 is 0.1 to 0.1.
Since the thickness is 4 μm, the adjustment can be performed sufficiently effectively even with a slight change in the thickness of the piezoelectric element 24. Therefore, in the floating magnetic head of this embodiment, the distance between the slider and the magnetic disk can be adjusted by applying a slight voltage to the piezoelectric element, and the magnetic head and the magnetic disk are not always in contact with each other. Therefore, damage to the magnetic head or the magnetic disk can be avoided and reliability can be improved.

Furthermore, the flying height of the slider can be finely adjusted by adjusting the voltage applied to the piezoelectric element.

Furthermore, the voltage applied to the piezoelectric element 24 is an AC voltage, and a current having a frequency of the natural frequency of the piezoelectric element 24 or a composite of the piezoelectric element 24 and the slider 16 is passed through the piezoelectric element 24, whereby the slider 16 is moved. Can be vibrated in the ultrasonic range. Even with this method, contact between the magnetic head and the magnetic disk 22 can be largely avoided, and the risk of head crash can be reduced. In particular, the magnetic head and the magnetic disk can be prevented from being attracted to each other, and the flying posture of the slider and the rotation stability of the magnetic disk can be improved.

[0014]

In the floating magnetic head of the present invention, a piezoelectric element is provided between the flexure and the slider, and by applying a voltage to this piezoelectric element, the distance between the slider and the magnetic disk can be adjusted, and the magnetic disk rotates The magnetic head and the magnetic disk are not always brought into contact with each other even when stopped. Therefore, the magnetic head and the magnetic disk do not slide,
It is possible to avoid damage to the magnetic head and the magnetic disk and improve reliability.

Furthermore, the flying height of the slider can be finely adjusted by adjusting the voltage applied to the piezoelectric element.

[Brief description of drawings]

FIG. 1 is a side view of a floating magnetic head of this embodiment.

FIG. 2 is a perspective view of a conventional floating magnetic head.

[Explanation of symbols]

 14 flexure 16 slider 18 magnetic core 22 magnetic disk 24 piezoelectric element 26 magnetic core

Claims (1)

[Claims] 1. A floating magnetic head in which a slider having a magnetic core is provided on a flexure at the tip of a load beam, wherein a piezoelectric element is interposed between the flexure and the slider. .