JPH07211032A - Apparatus for supporting floating type magnetic head - Google Patents

Abstract

PURPOSE:To obtain a supporting apparatus easy to record with a high density by providing a pressure-transmitting member between a first and a second supporting arms in the vicinity of a pivot for urging to increase a distance of the supporting arms. CONSTITUTION:A second supporting arm 10 is constituted of a bimorph of piezoelectric elements obtained by bonding thin piezoelectric elements 13, 14 to both surfaces of a shim 12 of a thin conductive, elastic plate. The arm 10 is changed from a state (a) to a state (b) when a polarity of a voltage impressed to the bimorph of piezoelectric elements is changed. A mounting part 23 at an end of a pressure-transmitting member 16 is fixed by an adhesive or the like to a first supporting arm 4 in the vicinity of an end of the supporting arm 4 in pressed touch with an end of a pivot 5. A glass thin plate 15 is securely bonded at an end of the second supporting arm 10 by an adhesive or the like. A semi-circular bending part 16a is formed at an end of the pressure- transmitting member 16, which is slidably pressed in touch with a face of the thin plate 15 to function as an urging spring to increase a distance between the arms 4 and 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supporting device for a floating magnetic head suitable for high density magnetic recording / reproducing, and more particularly to a supporting device for a floating magnetic head used in a non-contact start / stop (NCSS) system. .

[0002]

2. Description of the Related Art In a recording / reproducing apparatus for a magnetic recording medium (magnetic disk), the surface of the magnetic recording medium is not damaged.
In order to enable stable signal recording / reproduction, a magnetic gap portion of the magnetic head with respect to the surface of the magnetic recording medium is used during the recording operation of the information signal on the magnetic disk and the reproducing operation of the information signal from the magnetic disk. However, there is a case where a floating magnetic head is used which performs a recording / reproducing operation in a state of being floated at a predetermined minute interval. In a magnetic recording / reproducing apparatus in which a floating magnetic head is used as a magnetic head, a stable running operation of the magnetic head on the surface of a magnetic recording medium in a magnetic disk that is driven and rotated with surface wobbling and a floating magnetic head are performed. In addition to improving the function of the device from the viewpoint of eliminating mechanical resonance in the head support mechanism, in recent years, in particular, in order to achieve high-density recording / reproducing, the slider section of the floating magnetic head is mounted on the magnetic disk of the magnetic disk. Attempts have also been made to stably float the recording medium surface in an extremely close state of, for example, 0.05 μm.

When recording / reproducing is performed so that the magnetic gap surface of the magnetic head is located at a position apart from the surface of the magnetic recording medium to a certain extent, the magnetic gap of the magnetic head and the surface of the recording medium. The large distance between the magnetic head and the magnetic gap expands the magnetic flux for recording from the magnetic gap of the magnetic head, which makes high-density recording difficult, and uses a magnetic recording medium having a large coercive force for high-density recording. At this time, a large recording current must be passed through the magnetic head in order to generate a magnetic flux capable of performing magnetic recording on the magnetic recording medium, and a gap loss due to flying during reproduction is required. High-density recording / reproducing is achieved by the flying magnetic head that performs recording / reproducing operation with the magnetic gap surface of the magnetic head positioned away from the surface of the magnetic recording medium. Rukoto is so difficult, in order to realize high-density recording and reproduction by a floating magnetic head,
It is necessary to fly the slider portion of the floating magnetic head so that the magnetic gap surface of the magnetic head floating above the surface of the magnetic recording medium and the surface of the magnetic recording medium are extremely close to each other.

By the way, in order to stably levitate the air bearing surface of the slider portion of the floating magnetic head in the state of being extremely close to the magnetic recording medium surface of the magnetic disk, it is necessary to use a high speed rotating magnetic recording medium surface and a floating magnetic head. The lift force generated on the air bearing surface of the slider by the thin gas flow between the air bearing surface of the slider portion and the lift force generated on the air bearing surface of the slider by the pressing force applied to the slider portion of the flying magnetic head through the support structure of the air bearing magnetic head In addition to being required to obtain a flying height of .gamma., The mechanical resonance occurring in the part of the flying magnetic head and its supporting structure must not be adversely affected. In a magnetic recording / reproducing apparatus using a flying magnetic head, a contact start / stop (C) in which the flying surface of the slider part of the flying magnetic head is brought into contact with the magnetic disk surface when the magnetic disk is stopped.
SS) system or a non-contact start / stop (NCSS) system in which the air bearing surface of the slider part of the flying magnetic head is in non-contact with the magnetic disk surface even when the magnetic disk is stopped. Is adopted.

When the above-mentioned CSS system is adopted in the magnetic recording / reproducing apparatus, the magnetic recording medium surface and the air bearing surface of the slider portion of the floating magnetic head are attracted to each other, and the magnetic recording medium surface and the floating magnetic head are attracted. In order to prevent the air bearing surface of the slider section from being destroyed, for example, minute irregularities are provided on the magnetic recording medium surface, or a thin lubricant coating film is formed on the magnetic recording medium surface. Solution means for preventing the destruction of the air bearing surface of the magnetic recording medium surface or the slider portion of the flying magnetic head such as the above is applied, but when the above solution means is applied, In order to achieve high-density recording / reproducing, the slider portion of the floating magnetic head is placed on the surface of the magnetic recording medium of the magnetic disk, for example, 0.
Since it is not possible to stably fly in a state of being very close to each other such as 05 μm, as described above, the slider portion of the flying type magnetic head is extremely close to, for example, 0.05 μm on the magnetic recording medium surface of the magnetic disk. In order to stably levitate in a state where they are brought close to each other, a magnetic recording medium having a mirror-like surface is used, so naturally the CSS method cannot be adopted.

Therefore, in the state where the slider portion of the floating magnetic head is extremely close to the surface of the magnetic recording medium of the magnetic disk, the magnetic recording is provided with a mirror-like surface in order to stably fly and perform the recording / reproducing operation. When using media,
The NCSS method will be adopted. And NCSS
In the method, when the magnetic disk is stopped, the air bearing surface of the slider part of the flying magnetic head is kept at a position separated from the magnetic recording medium surface, and the magnetic disk is rotated at a predetermined rotation speed. While rotating at
The flying surface of the slider portion of the floating magnetic head is set so as to be floating above the surface of the magnetic recording medium in a predetermined manner. The displacement operation of the magnetic head can be performed by a driving mechanism using a bimorph type piezoelectric element, for example, as disclosed in Japanese Patent Laid-Open No. 60-83280.
JP-A No. 62-89285, JP-A No. 63-108576, JP-A No. 2-7279, JP-A No. 2-172072, and JP-A No. 3-178085. Has been done.

[0007]

However, in the prior art disclosed in the above-mentioned publications, etc., only the displacement amount and the pressing force which cannot obtain the pressing force and the coercive force for operating the dynamic pressure head. In the case where the negative pressure floating levitation type magnetic head type is displaced by using a piezoelectric element that cannot be generated, the levitation type magnetic head type is levitated at a predetermined minute distance on the surface of the magnetic disk. It is difficult to control, it is necessary to supply a high frequency for separation when the heads are separated, and it is not possible to obtain the pressing force and coercive force for operating the dynamic pressure head. A complicated mechanism is used because a booster mechanism or a cam is used to operate the flying magnetic head by using a piezoelectric element that can generate only displacement or pressing force. . In the device to which the above-mentioned conventional technique is applied, it is difficult to supply a predetermined pressing force to the levitation type magnetic head attached to the support arm, or the machine of the support arm portion including the levitation type magnetic head. Based on the characteristics of the dynamic resonance system, the slider portion of the floating magnetic head is placed on the surface of the magnetic recording medium of the magnetic disk, for example,
A solution for these various problems has been demanded because high-density recording / reproduction cannot be performed because it is not possible to stably float in a state of being extremely close to, for example, 05 μm.

[0008]

According to the present invention, a thin layer gas flow between a surface of a magnetic recording medium and an air bearing surface of a slider portion of a floating magnetic head causes a lift force generated on the air bearing surface to levitate against the magnetic recording medium surface. And a base portion of a first support arm having a gimbal spring to which the floating magnetic head is attached fixed near a tip end thereof, and the first support described above. Means for fixing a base of a second support arm, which is juxtaposed to the arm in parallel with each other, to a common mounting member in a state of being electrically insulated from each other, and an air bearing surface of a slider portion of a floating magnetic head. The tip end portion of the rotation fulcrum provided near the center of the surface opposite to the side is brought into contact with the first support arm by the elastic force of the gimbal spring, and the floating type is provided via the rotation fulcrum. Magnetic head slider The means for applying a pressing force and the spring provided near the base of the first support arm described above cause the first support arm to move in a direction in which the distance between the first support arm and the second support arm decreases. Between the first supporting arm and the second supporting arm in the vicinity of the position of the rotation fulcrum, the distance between the first supporting arm and the second supporting arm is increased. A supporting device for a floating magnetic head, which is provided with a pressing force transmitting member for urging in a direction to move the magnetic recording medium, and a second device above the surface of the magnetic recording medium in the supporting device for the floating magnetic head.
And a supporting device for the floating magnetic head, comprising: a control means for changing the distance between the supporting arm and the surface of the magnetic recording medium; and a means for displacing the second supporting arm. Means for displacing the second support arm formed of a bimorph type piezoelectric element by the control means for changing the distance between the second support arm above the surface of the magnetic recording medium and the surface of the magnetic recording medium. In the supporting device for the floating magnetic head provided, and in the above supporting device for the floating magnetic head, the control means for changing the distance between the second supporting arm and the magnetic recording medium surface above the magnetic recording medium surface, A plurality of bimorph-type piezoelectric elements are integrated at a predetermined distance from each other on their bases and on the opposite side. Providing support device of the floating-type magnetic head formed by providing a means for displacing the second supporting arm is constituted by a piezoelectric element of a plurality of bimorph forms are stacked so that the free end.

[0009]

Operation: Levitating on the surface of the magnetic recording medium by the lift force generated on the air bearing surface of the slider portion by the thin layer gas flow between the surface of the magnetic recording medium and the air bearing surface of the slider portion of the floating magnetic head. The magnetic head is supported by a gimbal spring provided near the tip of the first support arm, and is provided near the central portion of the surface of the flying magnetic head opposite to the air bearing surface. A pressing force is applied to the slider section of the floating magnetic head from the first support arm with which the tip end of the rotation fulcrum is in contact, via the rotation fulcrum described above. The second support arm is arranged in parallel with the first support arm at a distance from the first support arm, and is fixed in a fixed spatial position regardless of the surface wobbling of the magnetic recording medium surface during the recording / reproducing operation. A first support arm that is biased by a spring so that the distance between the second support arm and the second support arm is small, and a first support arm near the position of the rotation fulcrum. Between the second support arm,
The first support arm and the second support arm are urged in a direction to increase the distance between the first support arm and the second support arm, and the contact point with the second support arm is the first support arm and the second support arm. The pressing force applied to the slider section of the floating magnetic head via a rotation force and a pressing force transmission member that is small in size and can change a small bending amount to a large pressing force. Since the transmission force is transmitted, the pressing force transmission member can suppress mechanical vibrations up to a high frequency band satisfactorily by the operation with a small stroke, and as a result, the recording / reproducing waveform of the signal in the short wavelength region can be suppressed. The envelope of can be prevented from being disturbed.

That is, since the first support arm and the second support arm described above function as a support body having both ends supported against mechanical vibration of the floating magnetic head, the mechanical structure of the floating magnetic head is improved. Vibration is reduced. If the supporting structure of the floating magnetic head is a cantilever structure like the conventional device, the resonance frequency of the mechanical resonance system becomes low,
Although only the follow-up operation is performed in a relatively low frequency band, the distance between the second support arm and the second support arm that is juxtaposed at a distance from the first support arm is small. A first support arm that is biased by a spring so as to be reduced, and a first support arm near the position of the rotation fulcrum.
Between the first support arm and the second support arm, the first support arm and the second support arm are biased in a direction in which the distance between them is increased, and the second support arm comes into contact with the second support arm. The first support arm is provided with a pressing force transmission member that is provided such that the point changes in accordance with the distance between the first support arm and the second support arm, and is small in size and capable of applying a large pressing force with a small bending amount. When the second support arm and the second support arm are configured to function as a support body having both ends supported against mechanical vibration of the floating magnetic head, the support arm length on the pressing force transmitting member side is substantially short. In order to form a mechanical vibration system exhibiting a large stiffness, it is possible to follow the vibration of the levitation type magnetic head up to a high frequency band, and disturb the envelope of the recording / reproducing waveform of signals in the short wavelength range. Cause It can be a strange.

Further, by using the second supporting arm constituted by the bimorph type piezoelectric element composed of the thin piezoelectric element and the thin shim, the spatial position of the second supporting arm is applied to the piezoelectric element. By changing the applied voltage, the distance from the surface of the magnetic recording medium to the floating magnetic head can be easily changed. As the second support arm, a plurality of bimorph-type piezoelectric elements are integrated with each other with a predetermined gap between respective bases, and the bimorph-type piezoelectric element is laminated with the opposite side as a free end. Since the second support arm using the piezoelectric element exhibits a large amount of bending displacement when a low voltage is applied and has a large coercive pressure, the spatial position of the second support arm can be set to the above-mentioned piezoelectric position. Since the voltage applied to the element can be changed to easily change the distance from the surface of the magnetic recording medium to the floating magnetic head, it can be used as a supporting device for the floating magnetic head suitable for the NCSS method.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The concrete contents of a supporting device for a floating magnetic head according to the present invention will be described in detail below with reference to the accompanying drawings.
FIG. 1 is a side view of an embodiment of a floating magnetic head supporting apparatus according to the present invention, and FIGS. 2 and 3 are plan views and side views of a part of the floating magnetic head supporting apparatus according to the present invention, respectively. FIG. 6 is a side view showing an operating state of a part of the constituent parts of the supporting device for the floating magnetic head of the present invention. In FIG. 1, D is a magnetic recording medium disk (magnetic disk).
Is a magnetic recording medium surface 1 formed by adhering and forming a magnetic film on a mirror-polished surface of a glass or aluminum substrate, and the magnetic disk D described above is subjected to a recording / reproducing operation. Is rotated at a predetermined rotation speed by a rotation drive mechanism (not shown).

Further, H is a flying magnetic head, and this flying magnetic head H is thin between the magnetic recording medium surface 1 of the magnetic disk D and the flying surface 2a of the slider portion 2 of the flying magnetic head H. The lift force generated on the air bearing surface 2a by the layered gas flow causes the magnetic recording medium surface 1 to be in a floating state to perform a recording / reproducing operation, but the magnetic recording medium surface 1 and the air bearing surface 2a of the slider portion 2 of the floating magnetic head H. The distance (flying height ... flying height) is between the magnetic recording medium surface 1 of the magnetic disk D and the floating surface 2a of the slider portion 2 of the floating magnetic head H due to a thin layer gas flow. Of the floating magnetic head H and a later-described pressing force applied to the slider portion 2 of the floating magnetic head H. The floating magnetic head H is provided with a magnetic recording / reproducing unit used for recording an information signal to be recorded / reproduced on the magnetic disk D or reproducing the information signal recorded on the magnetic disk D. It is well known that this is done. As the magnetic recording / reproducing section described above, a thin film head having a core made of a ferromagnetic material in which a magnetic gap having a predetermined minute size is formed and a coil made of a conductive material can be used. In addition, in the accompanying drawings, for simplification of illustration, the illustration of the magnetic recording / reproducing unit and the wiring to the coil of the magnetic recording / reproducing unit is omitted.

The vicinity of one end of the gimbal spring 3 is fixed to the upper surface of the slider portion 2 of the flying magnetic head H by an adhesive, for example, and the other end 3a of the gimbal spring 3 is a first portion. Is fixed near the tip of the support arm 4 by means such as welding. Although the protrusion 5 is provided near the center of the upper surface of the slider portion 2 of the flying magnetic head H, the slider portion 2 of the flying magnetic head H is supported by the gimbal spring 3 as described above. By being urged toward the arm 4,
The tip of the protrusion 5 contacts the lower surface of the first support arm 4, whereby the protrusion 5 functions as a pivot. The above-mentioned protrusion 5 may be configured by pressing the above-mentioned gimbal spring 3 (punch), for example. In the case where the slider portion 2 of the flying magnetic head H is configured to also include an electrostatic capacitance value change detection electrode, a thin glass plate is placed on the upper surface of the slider portion 2 for example. The gimbal spring 3 is fixed to the slider portion 2 and the first support arm 4 so as to be electrically insulated.

The first support arm 4 has a thin plate 7 made of a conductive material and a spacer 8 made of an insulator fixed to the base portion 4a of the first support arm 4 by means such as adhesion or welding. A thin plate 9 made of a conductive material, which is fixed to a base portion 10a of a second support arm 10 described later, is fixed to the base portion 4a of the arm 4 while being fixed to the spacer 8 by means such as adhesion or welding. 1 support arm 4 and 2
Of the first support arm 4 and the base 10a of the second support arm 10 are integrated into a common mounting member 6. Attached by screws 11. A portion 4b of the first support arm 4 attached to the attachment member 6 that follows the base portion 4a.
Is the first support arm 4 and the second support arm 1 described above.
It functions as a spring that biases the first support arm in the direction in which the distance from 0 decreases, and the portion 4c of the first support arm 4 serves to increase the mechanical strength. It is a bent part. And the above-mentioned first
The support arm 4 can be made by stamping a thin plate of elastic material, for example a thin stainless steel plate.

The second support arm 1 shown in FIG.
Reference numeral 0 indicates an example of a configuration in which thin piezoelectric elements 13 and 14 are adhered to both surfaces of a shim 12 made of a thin conductive elastic thin plate to form bimorph piezoelectric elements. . The second support arm 10 composed of the bimorph-type piezoelectric element described above.
Changes to the state shown in FIG. 1 (a) and the state shown in FIG. 1 (b) by changing the polarity of the voltage applied to the bimorph type piezoelectric element. The first support arm 4 with which the tip of the above-described rotation fulcrum 5 is in contact.
In the vicinity of the tip end of the pressing force transmitting member 16, the mounting portion 23 at the end portion of the pressing force transmitting member 16 is fixed to the first support arm 4 by, for example, an adhesive, or the mounting portion 23 at the end portion of the pressing force transmitting member 16 is provided. It is fixed to the first supporting arm 4 by welding, and a thin glass plate 15 is fixed to the tip of the second supporting arm 10 by, for example, an adhesive.

The base end portion of the pressing force transmitting member 16 made of an elastic body is fixed to the mounting portion 23 at the end portion of the pressing force transmitting member 16 by fixing means such as welding or adhesion. ing. A semi-circular bent portion 16a is formed at the tip of the pressing force transmission member 16, and the bent portion 16a is the thin glass plate 15 described above.
Is slidably abutted on the surface of the spring, and the pressing force transmission member 16 biases the first supporting arm 4 and the second supporting arm 10 in a direction to increase the distance between them. Function as. The elastic force of the spring for urging the pressing force transmitting member 16 in the direction of increasing the distance between the first support arm 4 and the second support arm 10 is the same as that of the first support arm 4 and the second support arm 10. Is larger than the elastic force of the spring of the portion 4b of the first support arm 4 that urges the first support arm 4 in a direction to reduce the distance from the support arm 10. The thin glass plate 15 described above
Is a semicircular bent portion 16a formed at the tip of the pressing force transmitting member 16 that easily slides on the surface thereof, and has a semicircular bent portion at the tip of the pressing force transmitting member 16. 1
It is used as a member having a function of not abrading even when 6a slides.

As described above, the first support arm 4 has a spring in the vicinity 4b of the base of the first support arm 4 in the direction in which the distance between the first support arm 4 and the second support arm 10 decreases. The floating magnetic head H attached to the gimbal spring 3 whose one end is fixed to the first support arm 4 is urged by the elastic force of the first support arm 4. Since the floating magnetic head H is vertically displaced according to the surface wobbling of the magnetic disk D, the first support arm 4 is also vertically displaced. By the way, the second support arm 10 is held at a constant spatial position even if the floating magnetic head H is displaced in the vertical direction according to the surface wobbling of the magnetic disk D. As the head H is displaced in the vertical direction according to the surface wobbling of the magnetic disk D, the first
When the supporting arm 4 is vertically displaced, the pressing force transmitting member 16 provided between the first supporting arm 4 and the second supporting arm 10 is deformed, and It responds to the vertical displacement of the floating magnetic head H due to shake.

Compared to the first support arm 4 and the second support arm 10 described above, those having a very small size and shape (for example, 0.87 mm in width, 1.5 mm in length, and 2 in thickness).
The pressing force transmission member 16 described above, which is made of a stainless steel of 5 μm) and is extremely lightweight and has a large stiffness, presses near the free end side of the first support arm 4 and the second support arm 10. Due to the elastic deformation of the pressure transmission member 16 itself, the first support arm 4 and the second support arm 10 are brought into a state of being substantially in communication with each other, and the first support arm 4 and the second support arm 4 are connected. Since the support arm 10 of FIG. 3 operates as if it had a configuration similar to that of both support beams, the support device for a floating magnetic head according to the present invention is a floating type that exhibits good response characteristics up to a high frequency band as described above. Since the supporting device for the magnetic head can be provided, there is no problem in the supporting device for the floating type magnetic head of the cantilever type unlike the conventional device.

That is, in the supporting device for the floating magnetic head according to the present invention having the above-described structure, the surface deflection of the second supporting arm 10 is caused by the surface wobbling while the spatial position of the second supporting arm 10 is kept constant. The pressing force transmission member 1 provided between the first support arm 4 and the second support arm 10 against changes in the vertical acceleration of the floating magnetic head H.
The semi-circular bent portion 16a at the tip of 6 is deformed while sliding on the thin glass plate 15 fixed to the second support arm 10 by a small amount, and the floating magnetic head H has a high frequency component. As for the floating magnetic head H, the floating magnetic head H is capable of responding favorably by being displaced in the vertical direction, and the floating magnetic head H receives the pressing force applied via the pressing force transmitting member 16 and the rotation fulcrum 5 and The head H floats at a flying height, for example, 0.04 [mu] m to 0.08 [mu] m that balances the lift provided by the thin layer gas flow to the floating surface of the slider portion of the head H.

An experimental example in which a recording / reproducing operation was performed on a magnetic disk by using the floating magnetic head H supported by the above-described floating magnetic head supporting device of the present invention, that is, the magnetic field was rotated at 3600 rpm At a diameter position of 55 mm on the disk, the relative linear velocity between the flying magnetic head H equipped with a thin film head having a head width of 2.3 μm and a magnetic gap length of 0.26 μm and the magnetic disk is 10.37 m / s.
The magnetic film Hc of the magnetic disk is about 2000 Oe, and the flying height of the flying magnetic head H is 0.05 μm.
When a recording signal of MHz was recorded, a reproduction signal having D50 of 125 Kbits / inch, C / N of 37 dB, and a reproduction signal waveform with a stable envelope was obtained.

As described above, in the floating magnetic head supporting apparatus according to the present invention, the first supporting arm 4 and the second supporting arm 10 operate as if they have the same configuration as the supporting beams. As described above, it was possible to exhibit good response characteristics up to a high frequency band. Here, the cantilever type floating device used in the conventional supporting device and the supporting device for the floating magnetic head of the present invention is used. The following is a description of the type magnetic head supporting device in comparison. First, in a supporting device for a cantilever type floating magnetic head used in a conventional device, a floating force of the supporting arm is applied to the floating magnetic head supported by the supporting arm to move the floating magnetic head. The flying height of the floating magnetic head is determined. However, since the floating magnetic head is attached near the tip of a long supporting arm in the form of a cantilever, a machine consisting of the floating magnetic head and the supporting arm. The response characteristics of the mechanical vibration system when the levitation type magnetic head exerts an exciting force on the dynamic vibration system is limited to the low frequency band, and the high-order mechanical resonance of the support arm itself Existence,
Also, there is a problem that the floating magnetic head cannot faithfully respond to the surface runout of the magnetic disk due to the secondary resonance of the floating magnetic head itself. Especially, the response becomes poor in a high frequency band of 1 KHz or more. The flying height of the cantilever floating magnetic head changes slightly at high frequencies.

The flying type magnetic head is 0.1 μm to 0.2 μm.
When operating as a relatively high flying height, the use of the cantilever type floating magnetic head described above did not pose a big problem, but a higher density recording / reproducing operation was realized. Aiming at a flying height of, for example, 0.05μ
In the case of setting m units, even a small fluctuation of the flying height of the flying magnetic head will result in a large fluctuation ratio of the flying height, resulting in a large disturbance in the envelope of the reproduction signal output, and recording. The amplitude of the reproduced signal is changed, which causes jitter noise in the reproduced signal. Since a large loss occurs in the recording / reproducing output due to the increase in the flying height, the disturbance of the reproducing waveform becomes larger as the wavelength becomes shorter, resulting in an increase in jitter. In the conventional device, in order to solve the above-mentioned problems, measures such as shortening the support arm that supports the floating magnetic head and attaching a damping material to the support arm have been taken, but it is sufficient. No results were obtained.

On the other hand, in the supporting device for the floating magnetic head of the present invention, the floating magnetic head is arranged side by side with respect to the first supporting arm 4 so as not to respond to the surface wobbling of the floating magnetic head H. The second support arm 10 which is held at a constant spatial position by the second support arm 10 and the second support arm 10 described above.
The first support arm 4 is urged by the elastic force of the spring in the portion 4b so that the distance between the first support arm 4 and the second support arm near the position of the rotation fulcrum 5. Between the first support arm 4 and the second support arm 10, the contact point with the second support arm 10 is the first point. The mechanical force of the levitation type magnetic head is reduced by a pressing force transmitting member 16 which is provided so as to change according to the distance between the supporting arm 4 and the second supporting arm 10 and which is small in size and capable of exerting a large pressing force on a small bending amount. Since it functions as a support body of both ends supporting form against vibration, the above-mentioned pressing force transmission member can operate well with a small stroke, and can effectively suppress mechanical vibration up to a high frequency band, By that To the envelope of the reproducing waveform of the short wavelength range of the signal it is able to not disturbed.

Next, FIG. 2 is a plan view {(a) of FIG. 2} and a side view {(b) of FIG. 2} showing a concrete structure of the portion of the second support arm 10, and 12 is Shims, 13 and 14 are piezoelectric elements (piezoelectric ceramics), 15 is a thin glass plate (a plate made of an insulating material and having a slippery surface and abrasion resistance), 17, 1
Reference numeral 8 is an electrode, and 19 and 20 are terminals. The second support arm 10 shown in FIG. 2 is configured as a bimorph type by the shim 12 and the piezoelectric elements 13 and 14, and has terminals 19 and 20 connected to the electrodes 17 and 18 and the shim 12. By applying a voltage of a predetermined polarity and magnitude between the second support arm 10 and the second control arm 10, the second support arm 10 is brought into the load-on state as shown in FIG. The load is turned off as in (b). It should be noted that the second support arm 10 may be configured so as to always occupy a certain height position shown in FIG. 1A without using a piezoelectric element as its constituent member. Of course good things.

FIG. 3 exemplifies a constitutional example of the second supporting arm 10 constituted by using a plurality of sets (three sets in the illustrated example ... Any number of sets may be used for implementation) of bimorph type piezoelectric elements. FIG. 4 is a diagram showing the state of deformation, and FIG. 4 is a diagram showing a state of deformation when the second support arm 10 having the configuration shown in FIG. 3 is bent by application of a voltage. In FIG. 3, 1
2a, 12b, 12c are shims, and these shims 12a,
As 12b and 12c, for example, a metal thin plate having a thickness of 50 μm (as an example, a stainless steel thin plate having a thickness of 50 μm) can be used.
b, 13c, 14a, 14b, 14c are piezoelectric elements, and the piezoelectric elements 13a, 13b, 13c, 14a, 1
As 4b and 14c, for example, a piezoelectric element having a thickness of 50 μm (as an example, a piezoelectric ceramic element having a thickness of 50 μm)
Can be used.

Each of the above-mentioned shims 12a, 12b, 12c
And the piezoelectric elements 13a, 13b, 13c, 14a, 14
b and 14c respectively constitute different sets of bimorph-type piezoelectric elements, and the different sets of bimorph-type piezoelectric elements have connection pieces / spacers 21a and 21b (for example, a thickness of 6 μm) at one end thereof. The metal pieces) are sequentially bonded and laminated to be integrated with each other, but the other end of each of the different sets of the bimorph type piezoelectric elements is a free end. The shims 12a and 1 in the bimorph type piezoelectric elements of different sets described above.
The protruding ends of 2b and 12c (the right side portion in FIG. 3) are electrically connected, for example, by soldering 22, and at the same time, mechanical strength is enhanced. As the adhesive agent 24 used for sequentially adhering and laminating one end portion of each of the different types of bimorph-type piezoelectric elements as described above with the connection piece / spacers 21a and 21b interposed therebetween, for example, a conductive material When an adhesive (for example, silver paste) is used, the electrical connection state can be made more reliable.

3 (a) is a plan view and FIG.
3 (b) is a side view, FIG. 3 (c) is an enlarged exploded view of the laminated fixing portion in FIG. 3 (b), and in FIG. 3 (c), 24 is a conductive adhesive. As shown in FIG. 3, the bonding pieces and spacers 21a and 21b (for example, a metal piece having a thickness of 6 μm) are sequentially bonded to one end of each pair of bimorph-type piezoelectric elements. The second support arm 10 is laminated and integrated as a single unit, and the other end of each of the different sets of the bimorph type piezoelectric elements is made a free end, and the second support arm 10 is bent by the application of a voltage. And a step as indicated by L in the figure occurs between the free end portions of the plurality of different pairs of bimorph-type piezoelectric elements that constitute the second support arm 10. The magnitude of the coercive force in the second support arm 10 is the sum of the coercive pressures of the bimorph-type piezoelectric elements of each set in the plurality of sets of bimorph-type piezoelectric elements forming the second support arm 10. .

For example, the length is 19 mm and the width of the base is 6 m.
m, and the width of the tip is 3.5 mm. When a voltage of plus or minus 16 V is applied to a set of bimorph type piezoelectric elements, the bending amount is 1.1 mm, and the coercive pressure is 4 gr, the above bimorph Value of the second support arm 10 formed by stacking three sets of piezoelectric elements of the above-described form, and the resistance value of the second support arm 10 formed by stacking five sets of the above-described bimorph-type piezoelectric elements. The value of pressure is 12g each
r and 20 gr. In addition, the bending amount was almost the same regardless of the number of laminated sets. In this way, the connecting piece / spacer 21 is attached to one end of the bimorph type piezoelectric element of different sets.
a and 21b (for example, a metal piece having a thickness of 6 μm) are sequentially bonded and laminated to be integrated with each other,
A large coercive force can be obtained in the second support arm 10 having the configuration illustrated in FIG. 3 in which the other end of each of the different sets of bimorph piezoelectric elements is a free end.

For example, if the second support arm 10 is bent in the direction shown in FIG. 1B when a voltage having a positive polarity is applied to the shim 12 and a voltage having a negative polarity is applied to both surfaces of the piezoelectric element, the shim 12 When a voltage having a negative polarity is applied to both sides of the piezoelectric element and a voltage having a positive polarity is applied to both surfaces of the piezoelectric element, the second support arm 10 should bend in a direction opposite to the direction shown in FIG. 1 is attached to the support arm 4 of FIG.
Since the air bearing surface 2a of the slider portion 2 of the flying magnetic head H that is in contact with the supporting arm 4 of FIG. Between the drag force of the second support arm 10 corresponding to the lift force and between the first support arm 4 and the second support arm 10 near the position of the rotation fulcrum 5,
The first support arm 4 and the second support arm 10 are urged in a direction to increase the distance between them, and the contact point with the second support arm 10 is the second support arm 4 and the second support arm 10. The second support arm 10 is provided in such a manner as to change according to the distance between the second support arm 10 and the support arm 10. Will be located.
Assuming that the second support arm 10 is held at the position shown in FIG. 1A in the above-mentioned state, the second support arm 10 is used when the voltage applied to the piezoelectric element is zero. The spatial position of the support arm 10 is close to the state shown in FIG.

[0031]

As is apparent from the above detailed description, the supporting device for the floating magnetic head according to the present invention has the first structure.
The second support arm, which is arranged side by side with respect to the support arm and is fixed in a fixed spatial position regardless of surface wobbling of the magnetic recording medium surface during recording / reproducing operation. On the other hand, the first support arm is urged by the spring in the direction in which the distance between the second support arm and the gimbal spring provided near the tip of the first support arm. The tip end of a rotation fulcrum provided near the central portion of the surface of the slider portion of the supported floating magnetic head opposite to the air bearing surface side is brought into contact with the first support arm, and Between the first support arm and the second support arm near the position of the fulcrum, the first
Is urged in a direction to increase the distance between the first support arm and the second support arm, and the contact point with the second support arm changes according to the distance between the first support arm and the second support arm. And a pressing force transmitting member which is small in size and capable of applying a large bending force to a small bending amount, and the pressing force applied to the slider portion of the floating magnetic head is transmitted via the above-mentioned rotation fulcrum. Since the pressing force transmitting member operates with a small stroke, it is possible to satisfactorily suppress the mechanical vibration up to the high frequency band, and thereby the envelope of the recording / reproducing waveform of the signal in the short wavelength region. You can prevent the disturbance. That is, the second support arm, which is arranged in parallel with the first support arm at a distance, is biased by the spring so as to reduce the distance between the second support arm and the second support arm. Between the first support arm and the first support arm and the second support arm near the position of the rotation fulcrum, the distance between the first support arm and the second support arm is increased. The contact point with the second support arm is the first
And a pressing force transmitting member which is provided so as to change according to the distance between the supporting arm and the second supporting arm, and which is small in size and capable of giving a large pressing force with a small bending amount,
In the case where the first support arm and the second support arm are configured to function as a support body having both ends supported against mechanical vibration of the floating magnetic head, the pressing force transmitting member side is substantially present. In order to form a mechanical vibration system with a very short support arm length and a large stiffness, it is possible to follow the vibration of the levitation type magnetic head up to a high frequency band, and the recording / reproducing waveform of a signal in the short wavelength range can be followed. Of the second support arm can be prevented from being disturbed, and by using the second support arm constituted by the bimorph-shaped piezoelectric element composed of the thin piezoelectric element and the thin shim, the spatial space of the second support arm can be reduced. It is possible to easily change the distance from the surface of the magnetic recording medium to the floating magnetic head by changing the change in the voltage applied to the piezoelectric element as described above. As a plurality of bimorph-type piezoelectric elements, a bimorph-type piezoelectric element having a configuration in which the respective base portions are integrated at a predetermined interval from each other and is laminated with the opposite side as a free end is used. Since the second support arm exhibits a large amount of bending displacement when a low voltage is applied and has a large coercive force,
The spatial position of the second support arm can be changed by changing the voltage applied to the piezoelectric element to easily change the distance from the surface of the magnetic recording medium to the floating magnetic head.
Since it can be used as a supporting device for a floating magnetic head suitable for the S method, the present invention can satisfactorily solve the above-mentioned conventional problems.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of a support device for a floating magnetic head according to the present invention.

2A and 2B are a plan view and a side view of a part of a support device for a floating magnetic head according to the present invention.

3A and 3B are a plan view and a side view of a part of a support device for a floating magnetic head according to the present invention.

FIG. 4 is a side view showing an operating state of a part of a component of a support device for a floating magnetic head according to the present invention.

[Explanation of symbols]

D ... Magnetic disk, H ... Floating type magnetic head, 2 ... Flying type magnetic head H slider part, 2a ... Air bearing surface, 3 ... Gimbal spring, 4 ... First support arm, 5 ... Rotating fulcrum, 6 ... Mounting Member, 8 ... Spacer, 10 ... Second support arm, 1
2, 12a, 12b, 12c ... Shim, 13, 13a, 1
3b, 13c, 14, 14a, 14b, 14c ... Piezoelectric element, 15 ... Glass thin plate, 16 ... Pressing force transmission member, 16
a ... Semicircular bent portion, 17, 18 ... Electrodes, 19, 20
... terminals, 21a, 21b ... connecting piece / spacer, 22 ... soldering, 23 ... mounting portion,

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[Procedure amendment]

[Submission date] March 11, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 3

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

[0007]

However, in the prior art disclosed in the above-mentioned publications, etc., only the displacement amount and the pressing force which cannot obtain the pressing force and the coercive force for operating the dynamic pressure head. In the case where the negative pressure floating levitation magnetic head type is displaced by using a piezoelectric element that cannot be generated, the levitation type magnetic head is controlled to levitate at a predetermined minute distance on the surface of the magnetic disk. It is difficult to do so, it is necessary to supply a high frequency for separation when the heads are separated,
In order to operate the levitation type magnetic head using a piezoelectric element that can generate only the amount of displacement and pressing force that cannot obtain the pressing force and coercive force for operating the dynamic pressure head, a booster mechanism or a cam is used. A complicated mechanism was used because it was used. In the device to which the above-mentioned conventional technique is applied, it is difficult to supply a predetermined pressing force to the levitation type magnetic head attached to the support arm, or the machine of the support arm portion including the levitation type magnetic head. Based on the characteristics of the dynamic resonance system, the slider portion of the floating magnetic head is placed on the magnetic recording medium surface of the magnetic disk, for example, 0.05.
A solution for these various problems has been demanded because high-density recording / reproduction cannot be performed because it cannot be made to float stably in an extremely close state such as μm.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

[0008]

According to the present invention, a thin layer gas flow between a surface of a magnetic recording medium and an air bearing surface of a slider portion of a floating magnetic head causes a lift force generated on the air bearing surface to levitate against the magnetic recording medium surface. And a base portion of a first support arm having a gimbal spring to which the floating magnetic head is attached fixed near a tip end thereof, and the first support described above. Means for fixing a base of a second support arm, which is juxtaposed to the arm in parallel with each other, to a common mounting member in a state of being electrically insulated from each other, and an air bearing surface of a slider portion of a floating magnetic head. The tip end portion of the rotation fulcrum provided near the center of the surface opposite to the side is brought into contact with the first support arm by the elastic force of the gimbal spring, and the floating type is provided via the rotation fulcrum. Magnetic head slider The means for applying a pressing force and the spring provided near the base of the first support arm described above cause the first support arm to move in a direction in which the distance between the first support arm and the second support arm decreases. Between the first supporting arm and the second supporting arm in the vicinity of the position of the rotation fulcrum, the distance between the first supporting arm and the second supporting arm is increased. A supporting device for a floating magnetic head, which is provided with a pressing force transmitting member for urging in a direction to move the magnetic recording medium, and a second device above the surface of the magnetic recording medium in the supporting device for the floating magnetic head.
And a supporting device for the floating magnetic head, comprising: a control means for changing the distance between the supporting arm and the surface of the magnetic recording medium; and a means for displacing the second supporting arm. The second supporting arm formed of a bimorph type piezoelectric element is displaced by the control means for changing the distance between the second supporting arm above the surface of the magnetic recording medium and the surface of the magnetic recording medium. And a control device for changing the distance between the second support arm and the surface of the magnetic recording medium above the surface of the magnetic recording medium in the supporting device for the floating magnetic head. A plurality of bimorph-type piezoelectric elements are integrated with each other at predetermined intervals between the bases and are opposed to each other. There is provided a supporting device of the floating-type magnetic head formed by providing a means for displacing the second supporting arm is constituted by a piezoelectric element of a plurality of bimorph forms are stacked so that the free end.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

That is, since the first support arm and the second support arm described above function as a support body having both ends supported against mechanical vibration of the floating magnetic head, the mechanical structure of the floating magnetic head is improved. Vibration is reduced. If the supporting structure of the floating magnetic head is a cantilever structure like the conventional device, the resonance frequency of the mechanical resonance system becomes low,
Although only the follow-up operation is performed in a relatively low frequency band, the distance between the second support arm and the second support arm that is juxtaposed at a distance from the first support arm is small. A first support arm that is biased by a spring so as to be reduced, and a first support arm near the position of the rotation fulcrum.
Between the first support arm and the second support arm, the first support arm and the second support arm are biased in a direction in which the distance between them is increased, and the second support arm comes into contact with the second support arm. The first support arm is provided with a pressing force transmission member that is provided such that the point changes in accordance with the distance between the first support arm and the second support arm, and is small in size and capable of applying a large pressing force with a small bending amount. If the second support arm and the second support arm are configured to function as a support body having both-end support mode against mechanical vibration of the floating magnetic head, the support arm length is substantially short on the pressing force transmitting member side. In order to form a mechanical vibration system exhibiting a large stiffness, it is possible to follow the vibration of the levitation type magnetic head up to a high frequency band, and disturb the envelope of the recording / reproducing waveform of signals in the short wavelength range. Cause It can be a strange.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction content]

[0031]

As is apparent from the above detailed description, the supporting device for the floating magnetic head according to the present invention has the first structure.
The second support arm, which is arranged side by side with respect to the support arm and is fixed in a fixed spatial position regardless of surface wobbling of the magnetic recording medium surface during recording / reproducing operation. On the other hand, the first support arm is urged by the spring in the direction in which the distance between the second support arm and the gimbal spring provided near the tip of the first support arm. The tip end of a rotation fulcrum provided near the central portion of the surface of the slider portion of the supported floating magnetic head opposite to the air bearing surface side is brought into contact with the first support arm, and Between the first support arm and the second support arm near the position of the fulcrum, the first
Is urged in a direction to increase the distance between the first support arm and the second support arm, and the contact point with the second support arm changes according to the distance between the first support arm and the second support arm. And a pressing force transmitting member which is small in size and capable of applying a large bending force to a small bending amount, and the pressing force applied to the slider portion of the floating magnetic head is transmitted via the above-mentioned rotation fulcrum. Since the pressing force transmitting member operates with a small stroke, it is possible to satisfactorily suppress the mechanical vibration up to the high frequency band, and thereby the envelope of the recording / reproducing waveform of the signal in the short wavelength region. You can prevent the disturbance. That is, the second support arm, which is arranged in parallel with the first support arm at a distance, is biased by the spring so as to reduce the distance between the second support arm and the second support arm. Between the first support arm and the first support arm and the second support arm near the position of the rotation fulcrum, the distance between the first support arm and the second support arm is increased. The contact point with the second support arm is the first
And a pressing force transmitting member which is provided so as to change according to the distance between the supporting arm and the second supporting arm, and which is small in size and capable of giving a large pressing force with a small bending amount,
In the case where the first support arm and the second support arm are configured to function as a support body having both ends supported against mechanical vibration of the floating magnetic head, the pressing force transmitting member side is substantially present. In order to form a mechanical vibration system with a very short support arm length and a large stiffness, it is possible to follow the vibration of the levitation type magnetic head up to a high frequency band, and the recording / reproducing waveform of a signal in the short wavelength range can be followed. Of the second support arm can be prevented from being disturbed, and by using the second support arm constituted by the bimorph-shaped piezoelectric element composed of the thin piezoelectric element and the thin shim, the spatial space of the second support arm can be reduced. It is possible to easily change the distance from the surface of the magnetic recording medium to the floating magnetic head by changing the change in the voltage applied to the piezoelectric element as described above. As a plurality of bimorph-type piezoelectric elements, a bimorph-type piezoelectric element having a configuration in which the respective base portions are integrated at a predetermined interval from each other and is laminated with the opposite side as a free end is used. Since the second support arm exhibits a large amount of bending displacement when a low voltage is applied and has a large coercive force,
The spatial position of the second support arm can be changed by changing the voltage applied to the piezoelectric element to easily change the distance from the surface of the magnetic recording medium to the floating magnetic head.
Since it can be used as a supporting device for a floating magnetic head suitable for the S method, the present invention can satisfactorily solve the above-mentioned conventional problems.

Claims (4)

[Claims] 1. A levitation-type magnetic device that is floated with respect to the surface of a magnetic recording medium by a lift generated on the air bearing surface by a thin layer gas flow between the surface of the magnetic recording medium and the air bearing surface of a slider portion of the floating magnetic head. In the head supporting device, a gimbal spring to which a floating magnetic head is attached is fixed to a base portion of a first supporting arm fixed near a tip portion thereof, and
Means for fixing the base portion of the second support arm, which is arranged in parallel to the support arm in a spaced manner, to a common mounting member in an electrically insulated state from each other, and in the slider portion of the flying magnetic head. The tip end of the rotation fulcrum provided near the center of the surface opposite to the air bearing surface side is brought into contact with the first support arm by the elastic force of the gimbal spring, and the rotation fulcrum is passed through the first support arm. The distance between the first support arm and the second support arm is reduced by the means for applying a pressing force to the slider of the floating magnetic head and the spring provided near the base of the first support arm. Between the first supporting arm and the second supporting arm in the vicinity of the position of the rotation fulcrum, and the means for urging the first supporting arm in the direction described above. Increase the distance from the support arm of Support apparatus of the floating-type magnetic head formed by providing a pressing force transmission member that biases. 2. A levitation type magnetic device which is floated with respect to the surface of the magnetic recording medium by a lift generated on the air bearing surface by a thin gas flow between the surface of the magnetic recording medium and the air bearing surface of the slider portion of the floating magnetic head. In the head supporting device, a gimbal spring to which a floating magnetic head is attached is fixed to a base portion of a first supporting arm fixed near a tip portion thereof, and
Means for fixing the base portion of the second support arm, which is arranged in parallel to the support arm in a spaced manner, to a common mounting member in an electrically insulated state from each other, and in the slider portion of the flying magnetic head. The tip end of the rotation fulcrum provided near the center of the surface opposite to the air bearing surface side is brought into contact with the first support arm by the elastic force of the gimbal spring, and the rotation fulcrum is passed through the first support arm. The distance between the first support arm and the second support arm is reduced by the means for applying a pressing force to the slider of the floating magnetic head and the spring provided near the base of the first support arm. Between the first supporting arm and the second supporting arm in the vicinity of the position of the rotation fulcrum, and the means for urging the first supporting arm in the direction described above. Increase the distance from the support arm of A pressure transmitting member which biases,
A supporting device for a floating magnetic head, comprising: a second supporting arm above the surface of the magnetic recording medium; and a means for displacing the second supporting arm by a control means for changing the distance between the surface of the magnetic recording medium. 3. A levitation-type magnetic device that is floated on the surface of the magnetic recording medium by a lift generated on the air bearing surface by a thin layer gas flow between the surface of the magnetic recording medium and the air bearing surface of the slider portion of the floating magnetic head. In the head supporting device, a gimbal spring to which a floating magnetic head is attached is fixed to a base portion of a first supporting arm fixed near a tip portion thereof, and
Means for fixing the base portion of the second support arm, which is arranged in parallel to the support arm in a spaced manner, to a common mounting member in an electrically insulated state from each other, and in the slider portion of the flying magnetic head. The tip end of the rotation fulcrum provided near the center of the surface opposite to the air bearing surface side is brought into contact with the first support arm by the elastic force of the gimbal spring, and the rotation fulcrum is passed through the first support arm. The distance between the first support arm and the second support arm is reduced by the means for applying a pressing force to the slider of the floating magnetic head and the spring provided near the base of the first support arm. Between the first supporting arm and the second supporting arm in the vicinity of the position of the rotation fulcrum, and the means for urging the first supporting arm in the direction described above. Increase the distance from the support arm of A pressure transmitting member which biases,
And a means for displacing the second support arm formed of a bimorph type piezoelectric element by the control means for changing the distance between the second support arm and the surface of the magnetic recording medium above the surface of the magnetic recording medium. Supporting device for floating magnetic head. 4. A levitation type magnetic device that is floated on the surface of a magnetic recording medium by a lift force generated on the air bearing surface by a thin layer gas flow between the surface of the magnetic recording medium and the air bearing surface of a slider portion of the levitation type magnetic head. In the head supporting device, a gimbal spring to which a floating magnetic head is attached is fixed to a base portion of a first supporting arm fixed near a tip portion thereof, and
Means for fixing the base portion of the second support arm, which is arranged in parallel to the support arm in a spaced manner, to a common mounting member in an electrically insulated state from each other, and in the slider portion of the flying magnetic head. The tip end of the rotation fulcrum provided near the center of the surface opposite to the air bearing surface side is brought into contact with the first support arm by the elastic force of the gimbal spring, and the rotation fulcrum is passed through the first support arm. The distance between the first support arm and the second support arm is reduced by the means for applying a pressing force to the slider of the floating magnetic head and the spring provided near the base of the first support arm. Between the first supporting arm and the second supporting arm in the vicinity of the position of the rotation fulcrum, and the means for urging the first supporting arm in the direction described above. Increase the distance from the support arm of A pressure transmitting member which biases,
A plurality of bimorph-shaped piezoelectric elements are spaced apart from each other by a predetermined distance by the control means for changing the distance between the surface of the magnetic recording medium and the second support arm above the surface of the magnetic recording medium. And a unit for displacing a second support arm composed of a plurality of bimorph-type piezoelectric elements that are laminated so as to form a free end on the opposite side. Support device.