JPH0684309A - Magnetic head supporting device and controller - Google Patents

Abstract

PURPOSE:To prolong the life of a magnetic recording medium by attenuating the vibration of a magnetic head to the utmost and preventing the recording medium from being damaged. CONSTITUTION:This device is constituted of a magnetic head 5, a supporting body 4 supporting the magnetic head and a fixing device 1 fixing the supporting body. A vibration exciter 2 is set in the fixing device or the supporting body, so that a magnetic head supporting device by which the vibration of the magnetic head is attenuated is obtained. In order to automatically attenuate the vibration of the magnetic head, a displacement detection part 3 is set in the supporting body and a displacement signal is detected. Based on the detected signal, a signal for attenuating the displacement of the magnetic head is inputted in the exciter 2 through a control part 7 consisting of a differential integrator.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head support device and a magnetic head control device, and more particularly to a magnetic head support device and a magnetic head control device used for an external storage device of a computer.

[0002]

2. Description of the Related Art Conventionally, a magnetic head supporting device comprises a magnetic head having an electromagnetic conversion element portion, a support for supporting the magnetic head, and a fixing device for fixing the support. The magnetic head is a magnetic recording device. It is designed to be pressed against the medium with a constant force. When the magnetic medium rotates, air pressure causes wind pressure, and an air bearing effect occurs between the magnetic head and each surface of the magnetic recording medium facing each other. Due to this levitation force, the magnetic head overcomes the force of the spring of the magnetic head support (suspension) and floats above the surface of the magnetic recording medium, maintaining an appropriate interval and performing recording and reproduction through the magnetic recording medium. Has become.

[0003]

However, when the magnetic recording medium starts to rotate or stops rotating, the levitation force decreases and finally disappears, so that the magnetic head slides on the magnetic medium. Further, the contact between the magnetic head and the magnetic recording medium causes vibration in the magnetic head,
Due to the synergistic effect, the magnetic head and the magnetic recording medium come into contact with each other more strongly. As a result, the surface of the magnetic recording medium is damaged by the magnetic head, and due to the increase in frictional force between the magnetic recording medium and the magnetic head, the magnetic recording medium cannot be rotated or the magnetic recording medium is scratched and recorded. There was a problem that the existing data was destroyed.

The present invention has been made in view of the above problems, and an object thereof is to prevent damage to a magnetic recording medium and improve the durability of the magnetic recording medium.

[0005]

That is, the present invention relates to a magnetic head supporting device comprising a magnetic head, a support for supporting the magnetic head, and a fixing device for fixing the support, which is applied to the fixing device or the support. A magnetic head supporting device, characterized in that a shaker is provided, and a detecting section for detecting displacement of the supporting body arranged on a supporting body for supporting the magnetic head and detected by the detecting section. The magnetic head control device is characterized by comprising a control unit for applying a signal for damping the vibration of the support or the magnetic head to a vibrator provided on the fixing device or the support based on the displacement signal. Further, in the magnetic head control device, the displacement signal is detected at the start and / or stop of the rotation of the magnetic recording medium.

Usually, the supporting device may be referred to as a magnetic head, but in the present invention, the magnetic head simply means a portion having an electromagnetic transducer element portion or a portion including an electromagnetic transducer element portion and a slider. The magnetic head supporting device is composed of the magnetic head, a support for supporting the magnetic head, and a fixing device for fixing the support.

[0007]

When the magnetic recording medium rotates, the magnetic head often damages the surface of the magnetic recording medium due to the sliding of the magnetic head and the magnetic recording medium, especially the sliding at the start or stop of the rotation. A vibrator is installed on a support body that supports the head or a fixing device that fixes the support body, and the vibration of the magnetic head transmitted to the support body and the fixing device can be attenuated by the vibrator. Since excessive contact with the magnetic recording medium can be prevented, damage to the magnetic recording medium can be prevented and the durability of the magnetic recording medium can be improved. Since vibration of the head is reduced at the time of starting and stopping, damage to the magnetic recording medium can be reduced and durability can be improved. Then, a control unit is provided which detects the vibration of the magnetic head by a displacement detection unit installed on the support or a fixing device and gives a signal to the vibration exciter based on the displacement signal to attenuate the vibration of the support or the magnetic head. Therefore, the vibration of the magnetic head can be automatically attenuated, and the damage to the magnetic recording medium can be reduced as much as possible.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of the present invention will be specifically described below with reference to the drawings using an embodiment. FIG. 1 is a perspective view showing a state in which a magnetic head 5 supported by a support body 4 fixed to a fixing device section 1 floats above a rotating magnetic recording medium 6. In the present invention, the vibration exciter 2 is installed on the fixing device or the support, but in this figure, it is installed between the fixing device 1 and the support 4. A laminated piezoelectric element is used for this vibrator. Further, a detection unit is installed on the support unit to detect vibration of the magnetic head or the support unit, the displacement signal 8 is detected, and the magnetic head is controlled by the control unit 7 including a differential integrator based on this signal. Alternatively, the feedback control signal 10 is input to the vibration exciter 2 so as to damp the vibration of the support and minimize the vibration. At this time, the reference signal 9 in the differential integrator is set to be the same as the displacement signal when not vibrating, and when the rotation of the magnetic recording medium is started,
When stopped, a reference signal is input to generate a displacement output so as to minimize the vibration of the magnetic head and vibrate the support.

FIG. 2 shows the result of measuring the vibration of the magnetic head when the magnetic recording medium starts to rotate by the laser Doppler method shown below. The horizontal axis of FIG. 2 represents the vibration frequency, and the vertical axis represents the speed at which the magnetic head vibrates in the vertical direction. When the magnetic recording medium rotates, the magnetic head comes into contact with the magnetic recording medium to receive a force, and has a speed of oscillating in a direction perpendicular to the magnetic recording medium. The vibration waveform of the magnetic head in the case of the magnetic head supporting device and the control device of the present embodiment is shown by a broken line, whereas the vibration waveform of the magnetic head in the case of the conventional magnetic head supporting device without an exciter is shown by a solid line. . Thus, according to the magnetic head supporting device and the control device of the present invention, the vibration waveform of the magnetic head is higher than that of the conventional one.
It is clear that it is decaying.

As the vibration exciter, a heavy electric vibration exciter or the like can be used in addition to the one using the laminated piezoelectric element. Further, as the laminated piezoelectric element, a generally available laminated actuator or the like can be used. A sensor such as a piezoelectric element can be used as the detection unit that detects the vibration of the magnetic head or the supporting device. It should be noted that this embodiment shows one example thereof, and the present invention is not limited to this.

(Method of Measuring Vibration by Laser Doppler Method) The laser Doppler method utilizes the fact that when a laser beam is incident on the vibrating surface, the frequency of reflected light changes due to the Doppler effect. The magnetic head portion was irradiated with laser light, and the vibration signal was frequency-resolved with an FFT analyzer to obtain a vibration spectrum. Equipment used: Laser Doppler equipment: Graphtec
AT 3100 FFT Analyzer: Advantest R9211B
Type

[0012]

As described above, according to the present invention,
The support and the magnetic head can be vibrated by installing the vibrator on the support or the fixing device supporting the support, and the vibration of the support and the magnetic head can be damped. Further, according to the control device of the present invention, it is possible to automatically damp the vibration of the magnetic head, and particularly to significantly damp the vibration of the magnetic head or the supporting device at the time of starting and stopping the rotation of the magnetic medium. Damage to the recording medium can be reduced and durability can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a magnetic head support device and a magnetic head control device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a vibration waveform of a magnetic head according to an embodiment of the present invention and a vibration waveform of a conventional magnetic head.

[Explanation of symbols]

 1; Fixing device part 2; Vibration device 3; Displacement detection part 4; Support 5; Magnetic head 6; Magnetic recording medium 7; Control part 8; Displacement signal 9; Reference signal 10; Output signal

Claims (3)

[Claims] 1. A magnetic head support device comprising a magnetic head, a support for supporting the magnetic head, and a fixing device for fixing the support, wherein a vibration exciter is arranged on the fixing device or the support. A magnetic head support device characterized by the above. 2. A detector arranged on a support for supporting the magnetic head and detecting a displacement of the support and a displacement signal detected by the detector, based on a displacement signal detected by the detector. A magnetic head control device, comprising: a control unit for giving a signal to a shaker to damp the vibration of the support or the magnetic head. 3. A magnetic head controller, wherein the displacement signal according to claim 2 is detected at the start and / or stop of rotation of a magnetic recording medium.