JPH03214480A - Floating head slider sensor - Google Patents

Abstract

PURPOSE:To improve sensitivity by coupling a piezoelectric element to the coupling part of a floating head slider body and a slider supporting cymbal spring part and embedding a spherical body into the front end of a slider pressurizing and supporting spring part so that the spherical body pressurizes the slider body. CONSTITUTION:The spherical body 5 consisting of a metal or ceramics is embedded into the slider pressurizing and supporting spring part 3. The surface 4a of the piezoelectric element 4 coupled and disposed to the rear surface position of the floating slider body 1 is pressurized by this spherical body 5 as the pressurizing front end of the spring part 3. The floating head slider detects the microscillation of the floating head slider 1 generated by the collision against the projection on a magnetic disk and since the spherical body 5 acts as a weight in the oscillation detection of the body 1, the remarkable improvement in the sensitivity is possible. This sensor is particularly effective in the case of detection of the oscillation component of several kHz by the air resonance of the magnetic head slider.

Description

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

[Conventional technology]

FIG. 3 (al and fbl are diagrams showing an example of a conventional floating head slider sensor S. 1 is a floating head slider body, 2 is a slider support gimbal spring portion coupled to the back surface of the floating head slider body 1, and 3 is a diagram showing an example of a conventional floating head slider sensor S. A slider pressure support spring section 4 is a piezoelectric element, which is welded to the end of the slider support gimbal spring section 2 at the part marked *.The tip of the slider pressure support spring section 3 is processed to protrude, and the floating head slider l
It is designed to apply a load to the Here, an example is shown in which the piezoelectric element 4 is arranged above the joining position of the floating head slider body 1 and the slider support gimbal spring part 2.
In some cases, it is inserted and connected to the joint part of the .

Here, 4a is the slider pressurizing support spring portion 3 of the piezoelectric element 4.
4b is the surface on the side of the floating head slider main body l. Electrodes are attached to these surfaces 4a and 4b, respectively, and the vibrations of the slider pressurizing support spring portion 3 or the vibrations of the floating henode slider body 1 are extracted as a sensor output.

FIG. 4 is an explanatory diagram of how to use the floating henoto slider sensor S. 11 is a protrusion present on the magnetic disk 11; The floating slider sensor S is used to detect the protrusion 11a on the magnetic disk 11. The explanation will be given below according to the drawings.

On rare occasions, there is a protrusion 11a on the magnetic disk 1l that floats and cannot be followed by the slider main body l, so such a magnetic disk 11 must be removed beforehand when assembling the magnetic disk device. Therefore, it is common practice to check the presence or absence of such a protrusion 11a using a floating slider sensor S.

The floating slider sensor S floats on the magnetic disk at a constant interval in the same way as the toss slider. When it collides with the protrusion 11a, the floating henode slider body l
vibrates slightly due to this. This vibration is caused by the piezoelectric element 4
As a result, an induced voltage is generated between both surfaces 4a and 4b of the piezoelectric element 4. In this way, the protrusion 11a present on the surface of the magnetic disk 11 is detected.

[Problem to be solved by the invention]

However, since this vibration applied to the piezoelectric element 4 is very small, the induced voltage finally obtained from the piezoelectric element 4 is also small. For these reasons, a floating head slider sensor with higher detection sensitivity is required.

The present invention has been made in view of these points, and an object thereof is to provide a floating head slider sensor that has higher detection sensitivity than conventional sensors.

[Means to solve the problem]

Therefore, the present invention includes a floating head slider main body, a slider support gimbal spring part coupled to the main body, and a slider pressurization support spring part coupled to an end of the slider support gimbal spring part, and the slider pressurization support spring part is coupled to an end of the slider support gimbal spring part. In a floating head slider system configured such that the tip of the support spring section applies a load to the floating head slider body via the slider support gimbal spring section, a connecting portion or connection between the floating head slider body and the slider support gimbal spring section; A piezoelectric element is coupled to either side of the slider support gimbal spring part side of the slider pressurizing support spring part, and a spherical body made of metal or ceramics is embedded in the tip of the slider pressurizing support spring part, and the spherical body passes through the back surface of the piezoelectric element. The present invention is characterized in that the floating head slider body is pressurized.

〔Example〕

Examples of the present invention will be described below. Figure 1 f8+
, fbl is an embodiment of the floating henoto slider sensor A
FIG. Components that are the same as those shown in FIGS. It is characterized in that the surface 4a of the piezoelectric element 4 connected and arranged at the back side of the floating head slider main body 1 is pressed by the spherical body 5, using the spherical body 5 as the pressing tip of the slider pressurizing support spring portion 3.

As described above, the floating head slider sensor detects minute vibrations of the floating head slider body 1 caused by collision with the protrusion 11a on the magnetic disk 11. In this embodiment, since the spherical body 5 acts as a weight in detecting vibrations of the floating slider body l, it is possible to significantly improve sensitivity compared to the conventional pressurization method without a weight effect.

To confirm this, as shown in Figure 2 (al, fbl), the thickness is 0.3 mm, the width is l, and the length is 'l +
n piezoelectric elements 21 are vibrated with a constant amplitude by a vibrator 22, and a pressure spring 24 in which a steel ball 23 with a diameter of 3■■ is embedded is created.
(Fig. 2 (a)) and the pressure spring 25 (Fig. 2 (b)) having a protruding processed surface 25a, the frequency characteristics of the induced voltage of the piezoelectric element 21 were measured when pressurized with a constant load. .

As a result, a larger output voltage was obtained from the pressure spring 24 in which the steel ball 23 was embedded between 1 KIIz and 20 Kllz. That is, OdB at lKIIz, about 20dB at 2KIIz, about 40dB at 5KIIz, lO
There was an improvement in sensitivity of about 50 dFl at KHz and about 35 dB at 20 KHz.

As described above, this embodiment is particularly effective in detecting vibration components of several KHz or more due to air film resonance of the floating hend slider.

In addition, in the embodiment shown in -[-, the piezoelectric element was coupled to the surface of the slider support gimbal spring section 2, but it is also possible to insert the piezoelectric element into the coupling surface between the slider support gimbal spring section 2 and the floating navel 1 slider body l. Even if the spherical body 5 is disposed, the weight effect of the spherical body 5 at the tip of the pressure spring portion 3 is not lost, so that similar effects can be obtained.

〔Effect of the invention〕

As explained above, the present invention provides a highly sensitive /! There is an advantage that a P-dynamic slider sensor can be realized.

[Brief explanation of drawings]

Fig. 1 (al is a plan view of a floating head slider sensor according to an embodiment of the present invention, (bl is a front view, Fig. 2 ta+ is an explanatory diagram of the operation of the same floating head slider sensor, fb) is a plan view of a floating head slider sensor according to an embodiment of the present invention. An explanatory diagram of the operation of the head slider sensor, Fig. 3 (
al is a plan view of a conventional floating head slider sensor, (b
1 is a front view, and FIG. 4 is a diagram illustrating the use of the floating head slider sensor. S... Conventional floating head slider sensor, A... Floating head slider sensor of this embodiment, l... Floating head slider body, 2... Slider support cymbal spring portion, 3... Slider pressure support spring part,
4... Piezoelectric element, 5... Spherical body, 11... Magnetic disk, 11a... Protrusion, 2l... Piezoelectric element, 22
... Vibrator, 23... Steel ball, 24, 25... Pressure spring.

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 slider pressurization support spring section coupled to an end of the slider support gimbal spring section; In a floating head slider system configured such that the tip of the floating head slider body applies a load to the floating head slider body via the slider support gimbal spring portion, the connecting portion or the connecting portion between the floating head slider body and the slider support gimbal spring portion is provided. A piezoelectric element is coupled to either side of the slider support gimbal spring part, a spherical body made of metal or ceramic is embedded in the tip of the slider pressurizing support spring part, and the spherical body floats through the back surface of the piezoelectric element. A floating head slider sensor characterized in that the head slider body is pressurized.