JPH03214479A - Floating head slider sensor - Google Patents

Abstract

PURPOSE:To obtain the floating head slider sensor having a high sensitivity by providing a piezoelectric element so as to extend from a pressurizing and supporting spring part and pressurizing the load pivot of the rear surface of a floating head slider at the front end of the piezoelectric element. CONSTITUTION:One end of the long-sized piezoelectric element 8 is mounted from the rear surface of the pressurizing and supporting spring part to the rear surface and a load point pivot 3 is pressurized by the rear surface at the other end of the element 8. Electrodes are respectively mounted to the surface 8a on the spring part 7 side of the element 8b and the surface 8b of the floating head slider body 1 side and the sensor output is taken out therefrom. The floating head slider sensor is designed to detect the microscillation of the floating head slider body 1 generated by the collision with the projection on the magnetic disk and the oscillation of the body 1 is applied to the front end part of the element 8 via the pivot 3. The output voltage generated at this time is the voltage by the bending stress of the element 8. The sensitivity is greatly improved in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a highly sensitive floating head slider sensor used for magnetic disk verification.

[Conventional technology]

FIG. 3 (al, fb) is a diagram showing an example of a conventional floating head slider sensor S. 1 is a floating head slider main body, 2 is a slider support gimbal spring unit connected to the floating head slider main body 1, and 3 is a load protruding from the back surface of the joint between the back surface of the floating head slider main body 1 and the slider support gimbal spring unit 2. A point pivot, 4 is a pressurizing support spring portion coupled to the slider support gimbal spring portion 2, and 5 is a piezoelectric element.

Here, 5a is a surface of four examples of pressure support spring parts of the piezoelectric element 5;
5b is a surface on the floating head slider main body 1 side. Then, electrodes are attached to these surfaces 5a and 5b, respectively, from which the sensor output is taken out.

FIG. 4 is an explanatory diagram of how to use the floating hent slider sensor S. 6 is a magnetic disk, 6a is a magnetic disk 6
It is a protrusion on the top surface of. Floating head slider sensor S is
This is used to detect the protrusion 6a on the magnetic disk 6. The explanation will be given below according to the drawings.

Since there are rare protrusions 6a on the magnetic disk 6 that the floating hent slider main body l cannot follow, such a protrusion 6a must be removed beforehand when assembling the magnetic disk device.

Therefore, the presence or absence of such a protrusion 6a is generally carried out by scanning the floating slider sensor S once.

The floating henoto slider Senri-S floats on the magnetic disk 6 with a fixed gap maintained in the same manner as a normal floating henoto slider. When it collides with the protrusion 6a, the floating slider sensor S vibrates slightly. This vibration is applied to the piezoelectric element 5 via the load point pivot 3. This vibration is detected as an induced voltage generated in the electrodes on both surfaces 5a and 5b of the piezoelectric element 5. In this way, the magnetic disk 6
The protrusion 6a present on the surface is detected.

[Problem to be solved by the invention]

However, since this vibration applied to the piezoelectric element 5 is very small, the induced voltage finally detected from the piezoelectric element 5 is also small. Therefore, a floating head slider sensor S with higher detection sensitivity is required.

The present invention has been made in view of the above points,
The aim is to provide a floating sodosylada sensor with higher detection sensitivity than before.

[Means to solve the problem]

To this end, the present invention includes a floating head slider main body, a slider support gimbal spring part coupled to the main body, and a pressure support spring part coupled to an end of the slider support gimbal spring part, and the pressure support spring part is coupled to an end of the slider support gimbal spring part. A floating head slider configured to apply a load to the floating head slider body through a load point located at a rear surface of the floating head slider body and a connecting portion of the slider support gimbal spring portion. The system is characterized in that a piezoelectric element is provided so as to extend from the pressure support spring part, and the tip of the piezoelectric element pressurizes the spines 1 to 1 on the back surface of the floating head slider.

Example C] Examples of the present invention will be described below. Figure Ifal
, fbl are diagrams showing a floating head slider sensor 8 according to one embodiment. The same reference numerals as those in FIGS. 3(a) and (bl) described above are given the same reference numerals.

In this embodiment, the pressure support spring section 7 has a shape in which the tip of the conventional pressure support spring section 4 is removed, and one end of a long piezoelectric element 8 is attached to the lower surface of the tip.
The feature is that the load point pivot 3 is pressurized at the lower surface of the other end.

Then, electrodes are attached to the surface 8a of the piezoelectric element 8 on the pressure support spring section 7 side and the surface 8b on the floating henoto slider main body 1 side, respectively, and the sensor output is taken out therefrom.

1i? 1. As mentioned above, the floating head slider sensor detects minute vibrations of the floating head slider body l caused by collision with protrusions on the magnetic disk. is applied to the tip of the piezoelectric element 8 via the load point 3. The output voltage generated at this time is a voltage due to bending strain of the piezoelectric element 8. Therefore, compared to conventional strain detection in the thickness direction in which the entire surface of one side of the piezoelectric element is fixed, sensitivity can be significantly improved.

To confirm this, as shown in FIG.
A piezoelectric element 8I with a width of 1 + u and a length of 2 fins is arranged at the tip of the pressure support spring section 71, and the length of the piezoelectric element 81 is used to generate vibrations at each position in the direction (piezoelectric element base excitation/thickness direction strain). Detection/conventional equivalent, piezoelectric element tip excitation/bending strain detection/invention equivalent), vibration was performed using a vibrator 91 and the frequency characteristics were measured.

As a result, from 100llz to 5Kllz, the second
Compared to the piezoelectric element base vibration shown by the dotted line (thickness direction strain detection/corresponding to the conventional example), the piezoelectric element tip vibration shown by the solid line (
Bending strain detection/equivalent to the present invention) obtained a larger output voltage. That is, compared to the case where both sides of the piezoelectric element are sandwiched between pressure springs and the strain in the thickness direction is detected, the method of placing the piezoelectric element at the tip of the pressure spring and detecting the bending strain is 10
In the frequency range from 0 fiz to 5Kilz,
A sensitivity gain of approximately 15 dB was achieved.

From this, it can be seen that the present invention is particularly effective when detecting vibration components of 100I1z to several K}Iz, such as vibrations of the floating slider due to undulation of the magnetic disk surface and vibrations due to resonance of the floating head slider support system.

〔Effect of the invention〕

As described above, it is an object of the present invention to realize a highly sensitive floating head slider sensor that is useful for detecting minute protrusions existing on the surface of a magnetic disk, or for detecting shear vibrations caused by waviness of a magnetic disk or resonance of a slider support system. It has the advantage of being able to

[Brief explanation of drawings]

Fig. 1 is a plan view of a floating head slider sensor according to an embodiment of the present invention, (bl is a front view, and Fig. 2 is a plan view of a floating head slider sensor according to an embodiment of the present invention.
}Explanatory diagram of the operation of the slider sensor, Fig. 3 (al is a plan view of a conventional floating head slider sensor, (bl is a front view,
FIG. 4 is an explanatory diagram of the detection of the floating slider sensor. A...Floating head slider sensor of this embodiment, S...
- Conventional floating head slider sensor, l... floating head slider body, 2... slider support gimbal spring part, 3... load point pivot, 4... pressure support spring part,
5... Piezoelectric element, 6... Magnetic disk, 6a...
Projection, 7... Pressure support spring portion, 8... Piezoelectric element. 7l...Pressure support spring part, 8l...Piezoelectric element, 9l
... vibrator.

Claims (1)

[Claims] (1) A floating head slider body, a slider support gimbal spring section coupled to the slider support gimbal spring section, and a pressure support spring section coupled to the end of the slider support gimbal spring section, wherein the pressure support spring section is as described above. In a floating head slider system configured to apply a load to the floating head slider body through a load point pivot protruding from the back surface of the floating head slider body and the rear surface of the slider support gimbal spring connection part, A piezoelectric element is provided so as to extend from the support spring part,
A floating head slider sensor characterized in that a tip of the piezoelectric element pressurizes a load pivot on a back surface of the floating head slider.