JPH0340277A - Floating head slider sensor - Google Patents

Abstract

PURPOSE:To detect the fine vibration of a floating head slider to be applied on the other face of a piezoelectric element with high sensitivity by arranging the piezoelectric element on the lower face or upper face of a loading pivot and operating vibration suppressing force to one face of the piezoelectric element by a load spring. CONSTITUTION:A piezoelectric element 15 is arranged between a loading point pivot 13 and a pressurized supplying spring part 14 so as to be adhered and coupled with them. A floating head slider sensor A detects the fine vibration to be generated by collision with a projection on a magnetic disk and in such a case, however, the vibration of a floating head slider 11 is applied through the loading point pivot 13 to a face 15a of the piezoelectric element 15. On the other hand, the vibration is suppressed on a face 15b on an opposite side since the face 15b is fixed to the pressurized supporting spring part 14. Accordingly, the output voltage of the piezoelectric element 15 is generated by a piezoelectric effect caused by the difference of the vibration between the both faces 15a and 15b of the piezoelectric element 15 and the sensitivity is improved in comparison with the piezoelectric element 15 for which one side is a free space. Thus, the floating head slider sensor with the high sensitivity can be acquired.

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]

FIGS. 5(a) and 5(b) are diagrams of a conventional floating head slider sensor. In the figure, 1 is a floating head slider, 2 is a slider gimbal support part connected to the top surface (back surface) of the floating head slider 1, and 3 is formed by protruding from the top surface (back surface) of the slider gimbal support part 2. The load point pivot 4 is a pressurizing support spring portion that presses against the load point pivot 3, and the numeral 5 is a piezoelectric element disposed at the rear end of the back surface of the floating head slider 1. Note that the piezoelectric element 5 may be arranged at the front end of the back surface of the floating head slider 1.

The floating head slider 1, slider gimbal support section 2, load point pivot 3, pressure support spring section 4, and piezoelectric element 5 constitute a floating head slider sensor S.

Here, 5a is the surface of the piezoelectric element 5 on the floating hent slider side;
5b indicates the surface of the piezoelectric element 5 on the free space side. Electrodes are attached to both surfaces 5a and 5b, and the pressure of the piezoelectric element 5 is taken out as a sensor output.

FIG. 6 is a diagram showing the state in which the floating head slider sensor S shown in FIG. 5 is used for verification. Between the nuclei, 6 is a magnetic disk, 6a
indicates a protrusion on the magnetic disk. The floating head slider sensor S is used to detect such a protrusion 6a.

In rare cases, there is a protrusion 6a on the magnetic disk 6 that the floating head slider l cannot follow, so it is necessary to remove the magnetic disk having such a protrusion 6a beforehand when assembling the magnetic disk device. There is.

For this reason, it is common practice to use a floating head slider sensor S to check for the presence or absence of such a protrusion 6a.

The floating head slider sensor S floats above the magnetic disk 6 with a constant gap maintained therein like a normal floating head slider. The floating head slider 1 vibrates slightly when it collides with the protrusion 6a. This vibration is detected by the piezoelectric element 5. Here, the output voltage of the piezoelectric element 5 is generated by the piezoelectric effect due to the difference in vibration between the two surfaces 5a and 5b of the piezoelectric element 5.

[Problem to be solved by the invention]

However, since one side 5b of the piezoelectric element 5 is exposed to free space, this side 5b also vibrates in the same phase as the surface of the floating head slider 1, making high-sensitivity detection difficult. In order to solve this problem, the thickness of the piezoelectric element 5 is increased to suppress vibrations on the free space side, thereby increasing the sensitivity. However, increasing the size of the piezoelectric element 5 deteriorates the dynamic characteristics of the floating head slider, so there is a limit to its size.

The present invention has been made in view of the above circumstances, and its purpose is to provide a highly sensitive floating head slider sensor.

[Means to solve the problem]

For this purpose, in the first invention, a piezoelectric element is adhesively disposed between the load point pivot section and the pressure support spring section or between the load point pivot section and the head slider.

In the second invention, a piezoelectric element is inserted between the load point pivot part and the pressure support spring part.

〔Example〕

A floating/throat slider sensor according to an embodiment of the present invention will be described below. The main feature of this embodiment is that the piezoelectric element is placed above or below the load pivot of the floating head slider.

Embodiment 1 FIG. 1 (al (b) is an explanatory diagram of the floating head slider sensor A of the first embodiment. 11 is a floating head slider, 12 is a slider gimbal support part, 13 is a load point pivot, and 14 is an explanatory diagram of a floating head slider sensor A of the first embodiment. The pressure support spring portion 15 is a piezoelectric element.

Each of these parts itself is a conventional floating henodic slider/S.
It is the same as the one.

In this embodiment, the piezoelectric element 15 is adhesively bonded and disposed between the load point pivot 13 and the pressure support spring section 14.

This point is a feature of this embodiment.

Here, 15a indicates the surface of the piezoelectric element 715 on the load bearing support 3 side, and 15b indicates the surface of the piezoelectric element 15 on the pressure spring portion 14 side. Electrodes are attached to both surfaces 15a and 15b, and the pressure of the piezoelectric element 15 is taken out as a sensor output.

The floating head slider sensor A of this embodiment also has a magnetic disk 6 similar to the above-described conventional floating head slider sensor S.
The minute vibrations caused by the collision with the upper protrusion 6a are detected.

In this case, the vibrations of the floating head slider 11 are applied to the surface 15a of the piezoelectric element 15 via the load point pivot 13. On the other hand, since the surface 15b on the opposite side is fixed to the pressure support spring section 14, vibrations are suppressed. The output voltage of the piezoelectric element 15 is generated by the piezoelectric effect caused by the difference in vibration between both surfaces 15a and 15b of the piezoelectric element 15. Therefore, the piezoelectric element 15 of this embodiment can significantly improve sensitivity compared to the conventional floating henoto slider sensor S in which one side of the piezoelectric element 5 is a free space.

To confirm this, the thickness is 0, 25mm, the width is 2 questions,
A floating head slider sensor was fabricated in which piezoelectric elements with a length of 211,111 mm were incorporated into the same floating henodic slider in the arrangement configurations of this embodiment method and the conventional method, and vibration was applied to each using an exciter to increase the output of both piezoelectric elements. A comparative test was conducted.

FIG. 4 is a diagram showing the results of the comparative test. As is clear from the figure, it can be seen that the sensor output can be improved by about three orders of magnitude compared to the conventional method, although it differs depending on the vibration frequency.

Embodiment 2 FIG. 2 (al) is an explanatory diagram of the floating head slider sensor B of the second embodiment. 21 is a floating slider, 22 is a slider gimbal support, 23 is a load point pivot, and 24 is an explanatory diagram of a floating head slider sensor B of the second embodiment. The pressure support spring portion 25 is a piezoelectric element.

These parts themselves are also the same as those of the conventional floating henoto slider sensor S mentioned above.

In this embodiment, the piezoelectric element 25 is adhesively bonded between the back surface of the floating head slider 21 and the load point pivot 23. This point is a feature of this embodiment.

Here, 25a is the floating hent slider 21 of the piezoelectric element 25.
The back side surface 25b indicates the surface of 23 examples of load point pivots of the piezoelectric element 15.

In this case, the vibration of the floating head slider 21 is applied directly from the floating head slider 21 to the surface 25a of the piezoelectric element 250.

On the other hand, the vibration of the surface 25b on the side of the load point pivot 23 is suppressed by the spring force of the pressurizing support spring section 24 via the load point pivot 23. Therefore, in this embodiment as well, the sensitivity of the piezoelectric element 25 can be significantly improved compared to the conventional floating henoto slider sensor S in which one side of the piezoelectric element 5 is a free space.

Embodiment 3 FIGS. 3(a) and 3(b) are explanatory diagrams of a floating head slider sensor C according to a third embodiment. 31 is a floating hent slider, 32 is a slider gimbal support section, 33 is a load point pivot, 34 is a pressure support spring section, and 35 is a piezoelectric element.

These parts themselves are also similar to the conventional floating henoto slider sensor S.
It is the same as that of

In this embodiment, the piezoelectric element 35 is sandwiched between the load point pivot 33 and the pressure support spring part 340 without being adhesively bonded. This point is a feature of this embodiment. Therefore, the floating head slider sensors A and B of the first and second embodiments
Compared to the above, it is extremely easy to incorporate the piezoelectric element 35.

Here, 353 indicates a surface of the piezoelectric element 35 on the load pivot 33 side, and 35b indicates a surface of the piezoelectric element 35 on the pressure support spring section 34 side.

In this case, the vibration of the floating head slider 31 is applied to the surface 35a of the piezoelectric element 35 via the load point pivot 33. On the other hand, vibrations on the opposite surface 31b are suppressed by the load spring force. Therefore, in this embodiment as well, the sensitivity of the piezoelectric element 25 can be significantly improved compared to the conventional piezoelectric element 5 which has a free space on one side.

〔Effect of the invention〕

From the above, according to the present invention, the piezoelectric element is disposed on the lower or upper surface of the load pivot, and the vibration suppressing force by the load spring acts on one side of the piezoelectric element, so that the floating force applied to the other side of the piezoelectric element causes the slider to It has the advantage of being able to detect minute vibrations with high sensitivity.

[Brief explanation of drawings]

FIG. 1 ta) is a plan view of a floating head slider sensor according to a first embodiment of the present invention, FIG. FIG. 2 is a plan view of the floating head slider sensor of the example (bl is a front view showing a part of it as an end surface, FIG. 3 fal is a plan view of the floating head slider sensor of the third embodiment, FIG. 3) (111 is a front view showing a part of it as an end surface, FIG. 4 is a characteristic diagram showing the results of a sensitivity comparison test between the first embodiment and a conventional floating slider sensor, and FIG. 5 (a) ) is a plan view of a conventional floating head slider sensor, FIG. 5 (bl is a front view partially shown as an end face), and FIG. 6 is a diagram of the conventional floating head slider sensor in use. 11.21. 31...Sodo slider to floating, 12, 2
2.32...Slider gimbal support part, 13.23.
33... Load point pivot, 14.24.34... Pressure support spring section, 15.25.35... Piezoelectric element.

Claims (2)

[Claims] (1) comprising a floating head slider, a slider gimbal support part coupled to the floating head slider, and a pressure support spring coupled to an end of the slider gimbal support part; A floating head slider sensor configured to apply a load to the floating head slider via a load point pivot portion whose tip portion is formed to protrude from the back surface of the slider gimbal support portion, the load point pivot portion and the pressure support portion. A floating head slider sensor characterized in that a piezoelectric element is adhesively disposed between the spring section or between the load point pivot section and the head slider. (2) comprising a floating head slider, a slider gimbal support part coupled to the floating head slider, and a pressure support spring coupled to an end of the slider gimbal support part; A floating head slider sensor configured to apply a load to the floating head slider via a load point pivot portion whose tip portion is formed to protrude from the back surface of the slider gimbal support portion, the load point pivot portion and the pressure support portion. A floating head slider sensor characterized by having a piezoelectric element inserted between the spring part and the spring part.