JPH07211035A - Magnetic recording/reproducing apparatus - Google Patents

Abstract

PURPOSE:To obtain a magnetic recording/reproducing apparatus which is suitable to drive in a non-contact start/stop method, by providing a floating magnetic head fit for high-density magnetic recording/reproduction. CONSTITUTION:A floating magnetic head H is turned into a floating state over a disc D by a lift generated at a floating surface 2a of a slider part 2 because of a thin laminar air flow between the magnetic disc D and the floating surface of the slider part 2. The head D is supported by a gimbals spring 3 set in the vicinity of a front end of a first supporting arm 4. A pressing force is impressed to the arm 4 via a pivot 5 at the center of the slider part, and a second arm 10 constituted of a bimorph of piezoelectric elements in parallel to the arm 4 and having nothing to do with the vibration of the surface of the disc D is urged in a direction to increase a distance from the arm 4. The pressing force is transmitted to the slider part 2 via the pivot 5 and a pressure- transmitting member 16 which can turn a small bending amount to a large pressing force in accordance with the distance of the arms 4 and 10. Accordingly, mechanical vibrations of the head H are reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a flying magnetic head suitable for high density magnetic recording and reproducing, and has a configuration suitable for operating in a non-contact start-stop (NCSS) system. Regarding the device.

[0002]

2. Description of the Related Art In a recording / reproducing apparatus for a magnetic recording medium disk (magnetic disk), in order to enable stable signal recording / reproducing without damaging the surface of the magnetic recording medium disk, recording of an information signal on the magnetic disk is performed. During operation and during reproduction of information signals from the magnetic disk, the recording / reproducing operation is performed with the magnetic gap of the magnetic head floating above the disc surface of the magnetic recording medium at a predetermined minute interval. Type magnetic head may be used. In a magnetic recording / reproducing apparatus in which a floating magnetic head is used as the magnetic head, a stable running operation of the magnetic head on the disk surface of a magnetic recording medium in a magnetic disk that is driven and rotated with surface wobbling, and a floating In order to improve the function of the device from the viewpoint of eliminating mechanical resonance in the support mechanism of the magnetic head, and in recent years, in particular, in order to achieve high-density recording / reproducing, the slider portion of the floating magnetic head is used as a magnetic disk. On the disk surface of the magnetic recording medium of
Attempts have also been made to stably ascend in a state of extremely close distance such as 05 μm.

When recording / reproducing is performed so that the magnetic air gap surface of the magnetic head is located at a position distant from the disk surface of the magnetic recording medium, the magnetic air gap of the magnetic head and the recording medium. When the distance from the disk surface becomes large, the magnetic flux for recording from the magnetic gap of the magnetic head expands, making high-density recording difficult, and magnetic recording having a large coercive force for high-density recording. When a medium is used, in order to generate a magnetic flux capable of performing magnetic recording on the magnetic recording medium, it is necessary to flow a large recording current in the magnetic head, or for flying during reproduction. Since the gap loss may increase, the high-density recording / reproduction is performed by the floating magnetic head that performs the recording / reproducing operation so that the magnetic gap surface of the magnetic head is located at a position away from the disk surface of the magnetic recording medium. There is so difficult to achieve,
In order to realize high-density recording / reproduction with a floating magnetic head, the magnetic air gap surface of the magnetic head floating above the disk surface of the magnetic recording medium and the magnetic recording medium disk surface are floated so that they are extremely close to each other. It is necessary to levitate the slider part of the magnetic head.

By the way, in order to stably levitate the air bearing surface of the slider portion of the floating magnetic head in a state of being extremely close to the magnetic recording medium disk surface of the magnetic disk, it is necessary to rotate the magnetic recording medium disk surface rotating at high speed and the floating magnetic field. The lift force generated on the air bearing surface of the slider by the thin layer gas flow between the air bearing surface of the slider portion of the head and 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 the fact that the values of the proper relations are always required, it is necessary to prevent the mechanical resonance generated in the floating magnetic head and its supporting structure from adversely affecting. In a magnetic recording / reproducing apparatus using a flying magnetic head, a contact start stop (CSS) in which the flying surface of the slider portion of the flying magnetic head is in contact with the magnetic disk surface when the magnetic disk is stopped. Either the system or the 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. To be done.

When the above-mentioned CSS system is adopted in the magnetic recording / reproducing apparatus, the magnetic recording medium disk surface and the air bearing surface of the slider portion of the floating type magnetic head are attracted to each other, and the magnetic recording medium disk surface or the floating type magnetic head. In order to prevent the air bearing surface of the slider of the magnetic head from being destroyed, for example,
A slider for a magnetic recording medium disk surface or a floating magnetic head, such as providing minute irregularities on the magnetic recording medium disk surface or forming a thin coating film of lubricant on the magnetic recording medium disk surface. Although a solution for preventing the destruction of the air bearing surface of the part is applied, when the solution as described above is applied, the slider part of the flying magnetic head is changed to achieve high density recording / reproducing. Since it is not possible to stably levitate on the disk surface of the magnetic recording medium of the magnetic disk, for example, in the extremely close proximity of 0.05 μm, as described above, the slider portion of the flying type magnetic head is used for the magnetic disk of the magnetic disk. A magnetic recording medium having a mirror-like surface is used for stable floating in a state of being extremely close to, for example, 0.05 μm on the surface of the recording medium. Since become door, CSS method of course it would not be adopted.

Therefore, in the state where the slider portion of the floating magnetic head is extremely close to the disk surface of the magnetic recording medium of the magnetic disk, the magnetic disk having a mirror-like surface is used for stable flying and recording / reproducing operation. When a recording medium is used, the NCSS method will be adopted. And N
In the CSS system, when the magnetic disk is in a stopped state, the air bearing surface of the slider portion of the floating magnetic head is kept at a position separated from the magnetic recording medium disk surface, and the magnetic disk is kept at a predetermined position. When the slider is rotated at the number of revolutions, the air bearing surface of the slider portion of the flying magnetic head is floated on the disk surface of the magnetic recording medium in a predetermined manner. It is also possible to perform the displacement operation of the levitation type magnetic head at the time of rotation and at the time of non-rotation by, for example, a drive mechanism using a bimorph type piezoelectric element. JP-A-60-133575, JP-A-61-148681, JP-A-62-89285, JP-A-63-83979, and JP-A-63-2750. 3 JP, Hei 3 over 88,185
Japanese Patent Laid-Open No. 3-178785, Japanese Patent Laid-Open No. 4-2785
It has been conventionally proposed by Japanese Patent Publication No. 81275.

[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 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 head is separated, or it is not possible to obtain a pressing force and a coercive force enough to operate the dynamic pressure head. A complicated mechanism such as a booster mechanism or a cam is used to operate the floating magnetic head using a piezoelectric element that can generate only displacement or pressing force, or a support arm is used. It is difficult to supply a predetermined pressing force to the levitation type magnetic head mounted on the frame, or the levitation type magnetic head is based on the characteristics of the mechanical resonance system of the supporting arm part including the levitation type magnetic head. The high-density recording / reproducing cannot be performed well with the slider portion of the magnetic recording medium disk surface of the magnetic disk being extremely close to, for example, 0.05 μm and stably floating. Therefore, it was difficult to construct a magnetic recording / reproducing device that operates well by applying the NCSS method, and therefore a solution to the above-mentioned problems was sought.

[0008]

According to the present invention, a gimbal spring to which a floating magnetic head is attached is fixed to a base portion of a first support arm which is fixed near a tip portion thereof, and the first support arm described above. And the base portion of the second support arm formed of a bimorph-type piezoelectric element are fixed to a common mounting member in a state of being electrically insulated from each other. As described above, the tip end of the rotation fulcrum provided near the center of the surface of the magnetic head slider opposite to the air bearing surface is brought into contact with the first support arm by the elastic force of the gimbal spring. A pressing force is applied to the slider portion of the floating magnetic head via a pivot, and a spring provided near the base portion of the first supporting arm described above causes the first supporting arm and the second supporting arm to move. With arm Septum to bias the first support arm in a direction decreases further between the first support arm and the second support arm in the vicinity of the position of said pivot point,
And a pressing force transmitting member for urging the first supporting arm and the second supporting arm in a direction to increase the distance between them.
Furthermore, a supporting portion of the floating magnetic head in which a member for limiting the maximum value of the distance between the second supporting arm and the first supporting arm is provided in the second supporting arm, and the above-mentioned supporting of the floating magnetic head. Of the bimorph type which constitutes the above-mentioned second support arm so that the set position of the second support arm in the predetermined part in the predetermined space is changed corresponding to the rotational operation state of the magnetic recording medium disk. A magnetic recording / reproducing apparatus including means for controlling the magnitude and polarity of a voltage supplied to a piezoelectric element, and a predetermined space of a second supporting arm in a supporting portion of a floating magnetic head in the above-mentioned magnetic recording / reproducing apparatus. The setting position in the floating magnetic head is changed to a second position in the supporting portion of the floating magnetic head when the operating state is changed between the load on of the floating magnetic head and the load off of the floating magnetic head in the standby state. At least 1 / corresponding period as first resonance frequency value in the mechanical vibration system of the support arm portion
The bimorph constituting the second support arm so that the displacement operation between the two spatial positions of the second support arm in the support portion of the floating magnetic head described above is performed over a period of 8 hours. There is provided a magnetic recording / reproducing device comprising means for controlling the magnitude and polarity of a voltage supplied to the piezoelectric element of the above-mentioned form.

[0009]

The lift force generated on the air bearing surface of the slider portion by the thin-layer gas flow between the disk surface of the magnetic recording medium and the air bearing surface of the slider portion of the floating magnetic head causes the magnetic recording medium to float above the disk surface. The flying magnetic head is supported by a gimbal spring provided near the tip of the first supporting arm, and near the center of the surface of the flying magnetic head on the side opposite to the flying surface side. A pressing force is applied to the slider portion of the floating magnetic head from the first support arm with which the tip end of the rotation fulcrum provided in the contacting portion abuts. It is arranged in parallel with the first support arm at a distance, and is controlled so as to be fixed at a predetermined spatial position irrespective of the surface wobbling of the disk surface of the magnetic recording medium during a recording / reproducing operation. For the second support arm composed of a bimorph piezoelectric element,
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 the first support arm and the second support arm near the position of the rotation fulcrum. In between, the first supporting arm and the second supporting arm are urged in a direction to increase the distance between them, and the contact point with the second supporting arm is the first supporting arm and the second supporting arm. It is applied to the slider part of the flying magnetic head through a small pressing force transmitting member that can change a large bending amount and a turning fulcrum, which is provided so as to change according to the distance from the supporting arm. The pressing force is transmitted. 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 vibration of the floating magnetic head can be reduced. .

The first support arm and the first support arm are arranged side by side with a space therebetween, and are controlled so as to be fixed at a predetermined spatial position irrespective of surface wobbling of the disk surface of the magnetic recording medium during a recording / reproducing operation. A voltage having a predetermined magnitude and polarity corresponding to the rotational operating state of the magnetic recording medium disk is supplied to the bimorph-shaped piezoelectric element with respect to the second support arm that is configured by the bimorph-shaped piezoelectric element. As a result, the distance from the disk surface of the magnetic recording medium to the floating magnetic head can be easily changed in a predetermined manner, and the time during which the member is displaced when the distance is changed is set to the second support arm. It takes at least 1/8 of the period corresponding to the value of the primary resonance frequency in the mechanical vibration system of the part, and the second supporting arm in the supporting part of the above-mentioned floating magnetic head is used. A member for restricting the maximum value of the distance between the second supporting arm and the first supporting arm is provided on the second supporting arm so that the displacement operation between the two spatial positions of the frame can be performed. Therefore, the operation of the NCSS method can be performed stably and reliably.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The specific contents of the magnetic recording / reproducing apparatus of the present invention will be described in detail below with reference to the accompanying drawings. 1 and 2 are side views of the magnetic recording / reproducing apparatus of the present invention, and FIG.
6 to 7 are partial side views for explaining the operation of the magnetic recording / reproducing apparatus of the present invention, FIG. 7 is a waveform example diagram for explaining the operation of the magnetic recording / reproducing apparatus of the present invention, and FIG. The top view which shows the one part operation state of the magnetic recording / reproducing apparatus of invention,
FIG. 9 is a characteristic curve example diagram for explaining a part of the operation of the magnetic recording / reproducing apparatus of the present invention, and FIG. 10 is a characteristic curve example diagram of a bimorph type piezoelectric element. In each figure, D is a magnetic recording medium disk (magnetic disk), and this magnetic disk D has a magnetic recording medium disk surface 1 formed by depositing a magnetic film on a mirror-polished surface of a glass or aluminum substrate. The magnetic disk D is configured as described above.
Prior to the start of the recording / reproducing operation, is driven and rotated at a predetermined rotation speed by a rotation driving mechanism (not shown).

Further, H is a flying magnetic head, and this flying magnetic head H is located between the magnetic recording medium disk 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 thin layer gas flow causes the magnetic recording medium disk surface 1 to be levitated and the recording / reproducing operation is performed. The distance from the air bearing surface 2a (flying height ... flying height) is the same as that of the magnetic recording medium disk surface 1 of the magnetic disk D and the flying magnetic head H.
Is determined by the lift force generated on the air bearing surface 2a by the thin layer gas flow between the slider portion 2 and the air bearing surface 2a, and the pressing force applied to the slider portion 2 of the floating magnetic head H described later. 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. It should be noted that in the accompanying drawings, for simplification of the 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, for example, by an adhesive, and the other end 3a of the gimbal spring 3 is a first end. 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 slider portion 2 and the first support arm 4 are electrically insulated by fixing the gimbal spring 3 and the like.

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. . Then, 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 of the pressing force transmitting member 16, the mounting portion 20 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 20 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 20 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.

The first support arm 4 has a thickness of 25 μ, for example.
It is composed of a stainless steel sheet of m.
Is urged by the elastic force of a weak spring in the vicinity 4b of the base of the first support arm 4 in a direction in which the distance between the support arm 4 and the second support arm 10 decreases. Since the floating magnetic head H attached to the gimbal spring 3 having one end fixed thereto is in contact with the first support arm 4 by the rotation fulcrum 5, the floating magnetic head H is floated according to the surface wobbling of the magnetic disk D. When the magnetic head H is vertically displaced, the first support arm 4 is also vertically displaced accordingly. 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.

By the way, the second support arm 10 described above is used.
Since a member 17 for limiting the maximum value of the distance between the first support arm 4 and the second support arm 10 is attached to the second support arm 10, the second support arm 10 is removed from the magnetic recording medium disc surface 1. Even if the first supporting arm 4 is displaced so as to occupy a spatial position in a state of being largely separated, the first supporting arm 4 is attached to the second supporting arm 10, and the first supporting arm 4 and the second supporting arm 4 are attached. A member 17 for limiting the maximum value of the distance from 10 restricts the position to a state as illustrated in FIG. 1B, for example. Further, the lowermost position of the air bearing surface 2a of the slider portion 2 of the flying type magnetic head H mounted on the first support arm 4 via the gimbal spring 3 is also the same as the member 17 on the first side. Will be determined by the state in which the support arm 4 is engaged.

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 stainless steel (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 above-mentioned first support arm 4
The second support arm 10 and the second support arm 10 are substantially connected to each other, and the first support arm 4 and the second support arm 10 described above operate as if they have a configuration like two support beams. Therefore, the supporting portion of the floating magnetic head having the above-described configuration mode exhibits excellent response characteristics up to the high frequency band as described above.

In other words, the supporting portion of the floating magnetic head having the above-described structure has a floating magnetic head due to surface wobbling while the spatial position of the second supporting arm 10 is kept constant. The first support arm 4 and the second support arm 1 with respect to changes in the acceleration of the head H in the vertical direction.
The semi-circular bent portion 16a of the tip end portion of the pressing force transmission member 16 provided between 0 and 0 slides on the thin glass plate 15 fixed to the second support arm 10 by a minute amount. However, the floating magnetic head H can be deformed, and even the high frequency component can be displaced in the vertical direction to respond well.
The floating magnetic head H is applied by a pressing force applied via the pressing force transmission member 16 and the pivot 5 and a thin layer gas flow to the air bearing surface of the slider portion of the floating magnetic head H. The flying height that balances the lift force,
For example, it floats at 0.04 μm to 0.08 μm.

An experimental example in which a recording / reproducing operation was performed on a magnetic disk by using the flying magnetic head H supported by the supporting portion of the flying magnetic head having the above-mentioned structure, that is, 3600 revolutions per minute was performed. The relative linear velocity between the flying magnetic head H and the magnetic disk, which is equipped with a thin film head having a head width of 2.3 μm and a magnetic gap length of 0.26 μm, at a diameter position of 55 mm on 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.

In the second supporting arm 10 of the supporting portion of the floating magnetic head, 12 is a shim, 13, 1
Reference numeral 4 is a piezoelectric element (piezoelectric ceramic), 15 is a thin glass plate (a plate made of an insulating material and having a slippery surface and abrasion resistance), 1
Reference numerals 8 and 19 are connection lines. The second support arm 10
Is composed of the shim 12 and the piezoelectric elements 13 and 14 in the form of a bimorph. The support arm 10 is put in the load-on state as shown in FIG. 1A, or put in the load-off state as shown in FIG. 1B.

Now, the spatial position of the second supporting arm 10 in the supporting portion of the floating type magnetic head existing in the space on the disk surface 1 of the magnetic recording medium depends on the surface deflection of the magnetic disk D. Even if the magnetic head H is displaced in the vertical direction, the magnetic head H is prevented from changing, and in this state in which the spatial position of the second support arm 10 is kept constant, the surface wobbling occurs. When the floating magnetic head H is displaced in the up-down direction by the, the semicircular bent portion at the tip of the pressing force transmission member 16 provided between the first support arm 4 and the second support arm 10. 16a is the second
The transmission member 1 is deformed by sliding a small amount on the glass thin plate 15 fixed to the support arm 10.
The elastic force of 6 is applied as a pressing force to the floating magnetic head H via the rotation fulcrum 5. Then, as described above, the pressing force applied to the slider portion 2 of the floating magnetic head H and the lift force applied to the floating surface 2a of the slider portion 2 of the floating magnetic head H by the thin layer gas flow are in balance. Thus, the floating surface 2a of the slider portion 2 of the floating magnetic head H is
And the magnetic recording medium disc surface 1, that is, the flying height of the flying magnetic head H is determined.

For example, when the spatial position of the second support arm 10 approaches the magnetic recording medium disk surface 1, the pressing force applied to the floating magnetic head H increases and the flying magnetic head H is moved. If the flying height decreases and the spatial position of the second support arm 10 is far from the magnetic recording medium disk surface 1, the pressing force applied to the flying magnetic head H increases and the flying type is increased. The flying height of the magnetic head H is reduced. FIG. 1B shows a direction in which the second support arm 10 is separated from the magnetic recording medium disk surface 1 with respect to the bimorph-shaped piezoelectric elements 13 and 14 which form the second support arm 10. The first support arm 4 and the second support arm 1 in the case where a voltage having a polarity and a magnitude that causes a large displacement is supplied via the connection lines 18 and 19
The state with 0 is shown.

By the way, the pressing force transmitting member 1 provided between the first supporting arm 4 and the second supporting arm 10.
6 and the elasticity of the spring 4b provided in the vicinity of the base 4a of the first support arm 4, the elasticity of the pressing force transmission member 16 is smaller than that of the spring 4b, and The elastic force of the pressing force transmitting member 16 is such that the distance between the first support arm 4 and the second support arm 10 is increased, and the elastic force of the first support arm 4 and the second support arm 10 is increased. The elastic force of the spring 4b biases the first support arm 4
The first support arm 4 and the second support arm 10 are urged in such a direction that the distance between the first support arm 4 and the second support arm 10 is small. When the second support arm 10 and the second support arm 10 are in a state as shown in FIG. 1B, the air bearing surface 2a of the slider portion 2 of the flying magnetic head H is largely separated from the magnetic recording medium disc surface 1. The flying surface 2a of the slider portion 2 of the flying magnetic head H.
When the lift force generated by the gas flow is so small as to be negligible, the distance between the first support arm 4 and the second support arm 10 is increased by the elastic force of the pressing force transmission member 16 described above. The member 17 for limiting the maximum value of the distance between the first support arm 4 and the second support arm 10 extends to the maximum distance at which the first support arm 4 strikes.

The above-mentioned second support arm 10 is responsive to the magnitude and polarity of the voltage value applied via the connecting wires 18 and 19 to the bimorph type piezoelectric elements 13 and 14 constituting the second support arm 10. Since it has a rigidity that is deformed but is hard to be deformed by an applied external force, when the external force is applied to the support portion of the floating magnetic head, the external force causes the gimbal spring 3 to move to the first support arm 4. Even if the levitation type magnetic head H supported by the vibration is excited, the vibration is absorbed by the pressing force transmission member 16 provided between the first support arm 4 and the second support arm 10. Therefore, the floating magnetic head H collides with the magnetic recording medium disk surface 1 to cause the floating magnetic head H and the magnetic recording medium disk surface 1 to collide.
There is no such thing as the destruction of.

Next, the magnetic recording / reproducing apparatus shown in FIG. 2 will be described. When the floating magnetic head H is used by applying the NCSS method, the floating magnetic head H is brought close to the surface of the magnetic recording medium disk D after the magnetic recording medium disk D enters a steady rotation state. The lift force applied to the air bearing surface 2a of the slider portion 2 of the flying magnetic head H by a thin layer gas flow, and the lifting force applied to the flying magnetic head H via the pressing force transmitting member 16 and the rotation fulcrum 5. The floating magnetic head H is set in a floating state with a floating amount in a state of being balanced with the pressing force.
At the beginning of the operation of bringing the magnetic recording medium disk D closer to the surface of the magnetic recording medium disk D, since the pressing force applied to the floating magnetic head H via the pressing force transmitting member 16 and the rotation fulcrum 5 is small, the floating magnetic The head H is in a high flying position and is balanced with a small lift force given to the air bearing surface 2a of the slider portion 2 in the flying magnetic head H by the thin layer gas flow. As the pressing force applied to the levitation type magnetic head H via the rotation fulcrum 5 and the fulcrum 5 increases, the levitation type magnetic head H flies at a position closer to the surface of the magnetic recording medium disc D. Lift applied to the air bearing surface 2a of the slider portion 2 in the magnetic head H by a thin layer gas flow, and the pressing force applied to the floating magnetic head H via the pressing force transmission member 16 and the rotation fulcrum 5. Toga To Nsu.

FIG. 9 shows the pressing force applied to the floating magnetic head H via the pressing force transmitting member 16 and the pivot 5 and the flying height of the floating surface 2a of the slider portion 2 of the floating magnetic head H. 5 is a chart showing the experimental results for obtaining the relationship In the diagram shown in FIG. 9, the relative linear velocity is 6.9 per second in the magnetic recording medium disk D rotating at 2400 rpm.
When the diameter of the meter is 55 mm, the slider 2
Has an area of 0.906 mm 2 and a width of 0.
Two air bearing surfaces 2a with a length of 167 mm and a length of 2.713 mm
FIG. 6 is a diagram showing a relationship between a pressing force obtained by using the flying magnetic head H including the above and a flying amount of a flying surface 2a of a slider portion 2 in the flying magnetic head H. This Figure 9
Referring to, the pressing force of the floating magnetic head H is 0.7 g
In the case of r, the flying height is 1.7 μm, and when the pressing force of the floating magnetic head H is 1.0 gr, the flying height is 0.2 μm.
m, the flying height when the pressing force of the floating magnetic head H is 3.0 gr is 0.067 μm, and the flying height when the pressing force of the floating magnetic head H is 6.8 gr is 0.04 μm.
It can be seen that it is 9 μm.

The slider portion 2 in the flying magnetic head H
The lift force applied to the floating surface 2a by the thin layer gas flow and the pressing force applied to the floating magnetic head H via the pressing force transmission member 16 and the pivot 5 are in balance. The pressing force in FIG. 9 may be a lift force applied to the air bearing surface 2a of the slider portion 2 in the floating magnetic head H by a thin layer gas flow. Then, referring to FIG. 9 described above, the lift force applied to the air bearing surface 2a of the slider portion 2 in the flying magnetic head H by the thin layer gas flow is generated only at the extremely surface layer of the surface 1 of the magnetic recording medium disk D. I know there isn't.

When the floating magnetic head H is used by applying the NCSS method, it is brought close to the surface of the magnetic recording medium disk D in a steady rotation state or separated from the surface of the magnetic recording medium disk D. In some cases, the floating magnetic head H
It is important that the air bearing surface 2a of the slider portion 2 in (1) is parallel to or separated from the surface of the magnetic recording medium disk D as illustrated in FIG. In particular, the flying surface 2a of the slider portion 2 in the flying magnetic head H
However, in the state in which the surface of the magnetic recording medium disk D is close to a distance of several μm, the air bearing surface 2 of the slider portion 2 is
It is necessary that the inclination of the a with respect to the surface of the magnetic recording medium disk D in the length direction and the width direction is within 2 to 3 μm. That is, when the flying surface 2a of the slider portion 2 of the flying magnetic head H and the surface of the magnetic recording medium disk D are not parallel, when the flying magnetic head H approaches the surface of the magnetic recording medium disk D, the flying surface is lifted. The entire air bearing surface 2a of the slider portion 2 in the floating magnetic head H does not uniformly approach the surface of the magnetic recording medium disk D, but only a part of the air bearing surface 2a of the slider portion 2 in the floating magnetic head H does. First, the slider of the flying magnetic head H approaches the surface of the magnetic recording medium disk D, but the effective area of only a part of the flying surface 2a of the slider portion 2 of the flying magnetic head H is small as described above. When the air bearing surface 2a of the portion 2 approaches the surface of the magnetic recording medium disk D, the lift force generated in that portion causes the entire air bearing surface 2a of the slider portion 2 of the flying magnetic head H to be magnetic. Although smaller than the lift force generated when the surface of the recording medium disk D is uniformly approached, the pressing force applied to the floating magnetic head H via the pressing force transmission member 16 and the rotation fulcrum 5. Is the same regardless of whether the air bearing surface 2a of the slider portion 2 of the flying magnetic head H is parallel or non-parallel to the surface of the magnetic recording medium disk D, the air bearing surface of the slider portion 2 of the flying magnetic head H is the same. When the flying height 2a is not parallel to the surface of the magnetic recording medium disk D, the flying height of the flying surface 2a of the slider portion 2 in the flying magnetic head H becomes small, and the flying surface 2a of the flying portion 2a of the flying magnetic head H becomes smaller. The part may momentarily contact the surface of the magnetic recording medium disk D.

By the way, a part of the air bearing surface 2a of the slider portion 2 in the flying magnetic head H is a magnetic recording medium disk D.
Even if the magnetic recording medium disk D is contacted with the surface of the magnetic recording medium disk D, the rotation fulcrum 5 and the gimbal spring 3 normally move the floating surface 2a of the slider portion 2 of the flying magnetic head H. The normal flying state is achieved by making the state parallel to the surface of the slider 2. However, due to the swinging phenomenon of the slider portion 2 of the flying magnetic head H, the flying of the slider portion 2 of the flying magnetic head H is performed. The momentary contact operation that occurs between a part of the surface 2a and the surface of the magnetic recording medium disk D is caused by a part of the air bearing surface 2a of the slider portion 2 in the flying magnetic head H and the surface of the magnetic recording medium disk D. It will cause the crash phenomenon in the future to damage and.

Due to the above causes, the flying magnetic head H
The degree of damage to the magnetic recording medium disk D is remarkable when the floating magnetic head is supported by the supporting arm of the cantilever type floating magnetic head H used in the conventional apparatus. That is, since the support arm of the cantilever type floating magnetic head H used in the conventional apparatus is configured to have a large stiffness, the floating magnetic head H approaches the surface of the magnetic recording medium disk D. The pressing force applied to the slider part of the floating magnetic head H when the above-mentioned operation is performed is in the unit of about 10 gr, but the lift force that balances with the pressing force is the floating of the slider part in the floating magnetic head H. The flying height of the slider portion of the flying magnetic head H that can be generated on the surface is about 0.1 μm from the surface of the magnetic recording medium disk D. As described above, the flying height of the slider portion of the flying magnetic head H is 0.1.
It means that the inclination of the air bearing surface of the slider portion of the flying magnetic head H with respect to the surface of the magnetic recording medium disk D when the operation of bringing the flying magnetic head H closer is performed. , Values of around 0.1 μm are extremely minute, and it is necessary to manufacture each component part with an accuracy of the order of submicron. However, the component parts are manufactured with such accuracy. Practically difficult.

Therefore, the flying type magnetic head H adopting the cantilever type structure used in the conventional apparatus.
Since each component cannot be manufactured with a required accuracy in the supporting arm of No. 2, the slider portion of the flying magnetic head H is caused by the swinging phenomenon of the slider portion 2 of the flying magnetic head H at the time of load-on and load-off. It is impossible to prevent a momentary contact operation that occurs between a part of the air bearing surface 2a of No. 2 and the surface of the magnetic recording medium disk D. So
During use for a long period of time, dust may adhere to the floating magnetic head H or the magnetic recording medium disc D, or scratches may occur on the magnetic recording medium disc D. Therefore, in the conventional apparatus that employs the support arm of the cantilever type floating magnetic head H, even if the mechanical load is NCSS, the floating type is actually used during load-on and load-off. Since the magnetic head H and the magnetic recording medium disk D are in contact with each other, the effect of the NCSS system cannot be obtained.

However, as described above, the floating type in which the first support arm 4 and the second support arm 10 are provided with a configuration mode in which the first support arm 4 and the second support arm 10 operate as if they were configurations like both support beams. When the support portion of the magnetic head is used, the air bearing surface 2a of the slider portion 2 of the flying magnetic head H is non-parallel to the surface of the magnetic recording medium disk D as described above. As a means for preventing a momentary contact operation from occurring between the surface of the magnetic recording medium disk D and a part of the air bearing surface 2a of the slider portion 2 in the flying magnetic head H due to approaching the surface of D. When the flying magnetic head H approaches the surface of the magnetic recording medium disk D, the flying surface 2a of the slider portion 2 in the flying magnetic head H can be made parallel to the surface of the magnetic recording medium disk D. The supporting portion of the flying magnetic head H is configured to have such a mounting accuracy that the floating magnetic head H is floating, or the flying surface 2a of the slider portion 2 of the flying magnetic head H is lifted by several μm from the surface of the magnetic recording medium disk D. The lift force applied to the air bearing surface 2a of the slider portion of the floating magnetic head H by the thin layer gas flow in the above state is 0.6 gr with reference to the chart of FIG.
Therefore, when the air bearing surface 2a of the slider portion 2 of the flying magnetic head H is floating above the surface of the magnetic recording medium disk D by several μm, the pressing force transmitting member 16 and the pivot point 5 are used. The pressing force applied to the slider portion 2 of the flying magnetic head H via
It should be about.

Then, the pressing force applied to the slider portion 2 in the floating magnetic head H operates as if the first support arm 4 and the second support arm 10 had a structure like both support beams. And supplying a voltage having a predetermined polarity and magnitude to the bimorph type piezoelectric element forming the second supporting arm 10 in the supporting portion of the floating magnetic head having the above-described configuration. It is clear from the above that it can be set to a predetermined value. That is, the spatial position of the second support arm 10 in the support portion of the floating magnetic head existing in the space on the disk surface 1 of the magnetic recording medium is
The bimorph type piezoelectric element forming the second support arm 10 can be set to a predetermined value by supplying a voltage having a predetermined polarity and magnitude. The elastic force of the pressing force transmission member 16 provided between the first support arm 4 and the second support arm 10 rotates when the spatial position of 10 is kept constant at a certain spatial position. It is applied as a pressing force to the floating magnetic head H via the fulcrum 5.

Then, as described above, the flying magnetic head H
The balance of the pressing force applied to the slider portion 2 of the flying magnetic head H and the lift force applied to the air bearing surface 2a of the slider portion 2 of the flying magnetic head H by the thin layer gas flow balances the slider portion 2 of the flying magnetic head H. Since the distance between the air bearing surface 2a and the magnetic recording medium disk surface 1, that is, the flying height of the flying magnetic head H is determined, the spatial position of the second supporting arm 10 is set to the second supporting arm 10. By adjusting and setting the voltage to be supplied to the bimorph type piezoelectric element being operated, for example, the value of the pressing force applied to the slider portion 2 of the flying magnetic head H is 7 gr to 0.6 g.
The flying height of the flying surface 2a of the slider portion 2 of the flying magnetic head H is changed to 0.05 μm by changing the flying height of the flying magnetic head H in the range of r.
It can be easily made to be several μm. As described above, in the magnetic recording / reproducing apparatus of the present invention, since the pressing force exceeding the lift force is not applied to the slider portion 2 of the flying magnetic head H, the flying magnetic head H is also operated during the load-on operation and the load-off operation. The slider portion 2 does not come into contact with the magnetic recording medium disc surface 1.

As described above, when the flying surface 2a of the slider portion 2 in the flying magnetic head H is close to the surface of the magnetic recording medium disk D by a distance of several μm, the slider portion 2 of The inclination of the air bearing surface 2a with respect to the surface of the magnetic recording medium disk D in the length direction and the width direction is 2 to
It is necessary to be within 3 μm, but the inclination is 2 to
The numerical value of 3 μm or less makes the floating magnetic head H approach the surface of the magnetic recording medium disk D by using the supporting arm of the cantilever type floating magnetic head H used in the above-mentioned conventional apparatus. It is said that the allowable value of the non-parallelism in which the air bearing surface of the slider portion of the flying magnetic head H and the magnetic recording medium disk surface 1 are out of parallel with each other when the operation is performed is a value of about 0.1 μm. Since it is a much larger numerical value than the above, the support arm of the floating magnetic head H used in the magnetic recording / reproducing apparatus of the present invention can be manufactured with mechanical precision that can be adapted to mass production.

In FIG. 2, the first support arm 4 and the second support arm 4
In order to limit the maximum distance between the support arm 10 and
The member 17 attached to the second support arm 10 is
It is in a state of holding the first support arm 4,
In this state, the floating magnetic head H is attached to the first support arm 4 via the gimbal spring 3.
The air bearing surface 2a of the slider portion 2 in the magnetic recording medium disk surface 1
The state of each part shown in FIG. 2 is supplied to the bimorph type piezoelectric element forming the second supporting arm 10 as shown in FIG. Voltage is 0, and the connecting wires to the piezoelectric element are 18, 1
It is obtained with 9 short-circuited.

Then, in the supporting portion of the floating magnetic head shown in FIG. 2, as in the second supporting arm 10 in the supporting portion of the floating magnetic head shown in FIG. Support arm 10 in the support part of the
With respect to the bimorph type piezoelectric element constituting the above, the supply voltage is set to 0, and the connecting wires to the piezoelectric element are short-circuited at 18 and 19, and the first supporting arm 4 is connected to the first supporting arm 4 via the gimbal spring 3. In order to make the air bearing surface 2a of the slider portion 2 of the flying type magnetic head H attached in the above state parallel to the magnetic recording medium disc surface 1 by several μm above the magnetic recording medium disc surface 1 in the stopped state, The base portion 10a of the second support arm 10 is attached to the attachment member 6A by the screw 11 so that the tip end portion of the second support arm 10 is inclined upward as compared with the base portion. ing. The floating magnetic head supporting portion shown in FIG. 2 has an advantage that the operating mode of the supporting arm is simple and easy to manufacture with respect to the control voltage applied to the bimorph piezoelectric element forming the second supporting arm 10. However, when the pressing force is generated, the control voltage supplied to the bimorph type piezoelectric element is 0.
Since it is either a voltage in the + direction from V or a voltage in the − direction from 0 V, a bimorph type piezoelectric element originally has a voltage in the + direction from 0 V and a − direction from 0 V.
Considering that it can be displaced with respect to both the directional voltage, there is a drawback that the efficiency is low.

By the way, in the supporting portion of the floating magnetic head shown in FIG. 1, the supply voltage to the bimorph type piezoelectric element forming the second supporting arm 10 is set to 0, and the piezoelectric element is supplied to the piezoelectric element. With the connecting wires 18 and 19 short-circuited, the second support arm 10 is set to be substantially parallel to the magnetic recording / reproducing medium disk surface 1, and the base 10
a is attached to the attachment member 6 with screws 11. Therefore, in the above-mentioned state, if it is assumed that the magnetic recording medium disk D does not exist, the first supporting arm 4 in the supporting portion of the floating magnetic head is not supported by the first supporting arm 4 and the second supporting arm 4. While being held by the member 17 attached to the second support arm 10 in order to limit the maximum distance between the arm 10 and the arm 10, it becomes inclined toward the tip side of the member 17, and the floating magnetic The levitation type magnetic head H attached to the first supporting arm 4 in the head supporting portion via the gimbal spring 3 is
As illustrated in FIG. 3, the magnetic recording medium is located below the disk surface 1.

Therefore, when the supporting portion of the floating magnetic head having the configuration as shown in FIG. 1 is used,
When the flying type magnetic head H is brought close to the magnetic recording medium disc surface 1, the second surface is set so that the flying surface 2a of the slider portion 2 of the flying magnetic head H becomes parallel to the magnetic recording medium disc surface 1. A voltage having a predetermined polarity and magnitude is supplied to the bimorph piezoelectric element that constitutes the support arm 10, so that the second support arm 10 tilts upward from its base portion 10a to its tip portion. In addition, it is necessary to confirm that the air bearing surface 2a of the slider portion 2 of the flying magnetic head H is parallel to the magnetic recording medium disk surface 1. As described above, when the supporting portion of the flying magnetic head having the configuration shown in FIG. 1 is used, the flying magnetic head having the configuration shown in FIG. 2 is used. Although a complicated operation is required as compared with the case where the support part of (1) is used, a voltage is supplied so as to efficiently operate the bimorph-type piezoelectric element forming the second support arm 10. Therefore, it is possible to use a smaller piezoelectric element than the piezoelectric element used for the second support arm 10 in the support portion of the floating magnetic head having the configuration as shown in FIG. it can.

The supply voltage to the bimorph type piezoelectric element forming the second support arm 10 in the support portion of the floating magnetic head shown in FIG. 1 is set to 0, and the connecting line to the piezoelectric element is In the state where 18 and 19 are short-circuited, the floating magnetic head H mounted on the first support arm 4 via the gimbal spring 3 has a magnetic recording medium disc surface as shown in FIG. Since it is positioned below 1, the second
When the supply voltage to the bimorph type piezoelectric element forming the support arm 10 is 0, the floating magnetic head H comes into contact with the magnetic recording medium disc surface 1 in the storage state.

The above-mentioned problem is to configure the magnetic recording / reproducing apparatus so that the floating magnetic head H can be moved to the side area of the magnetic recording medium disk D in the storage state and retracted as illustrated in FIG. It can be solved satisfactorily. FIG. 8 is a plan view of the magnetic recording / reproducing apparatus, and D in FIG. 8 is a magnetic recording medium disk. Reference numeral 21 denotes a carriage. The carriage 21 pivots a pivot shaft 22 as a pivot center to pivotally move the flying magnetic head H on a recording / reproducing area of a magnetic recording medium disk D, and The flying magnetic head H is pivotally moved to a side area of the recording medium disc D and retracted. As described above, the second support arm 10 is attached to the attachment member 6 provided on the carriage 21.
And the first support arm (second support arm 10 in FIG. 8).
(Not shown in the figure as they are disturbed by) are attached by screws 11.

The support portion of the floating magnetic head shown in FIG. 8 has the configuration as described above with reference to FIG. 1, and its side view is shown in FIG. ),
The second support arm 10 is shown as being similar to FIG. 2B, and the second support arm 10 is provided on both sides of the shim 12 made of a thin conductive elastic thin plate as described above with reference to FIG. Each of the second support arms 10 is composed of a bimorph-type piezoelectric element in which thin piezoelectric elements 13 and 14 are adhered to each other. Through the state illustrated in FIG. 5 respectively. When the magnetic recording / reproducing apparatus shown in FIG. 8 is in the inoperative state, the carriage 21 positions the flying magnetic head H in the lateral region of the magnetic recording medium disk D to form the second support arm 10. If the voltage applied to the bimorph type piezoelectric element is 0,
The first support arm 4 supporting the levitation type magnetic head H via the gimbal spring 3 is used as the first support arm 4 and the second support arm 10.
In order to limit the maximum value of the distance between and, it is supported by the member 17 attached to the second support arm 10.

When the magnetic recording / reproducing apparatus is put into operation, the magnetic recording medium disk D is rotated to a predetermined rotation speed by a rotation drive mechanism (not shown), and
When the magnetic recording / reproducing apparatus is in the inoperative state, the flying magnetic head H in which the air bearing surface 2a of the slider portion 2 is located below the magnetic recording medium disk surface 1 in the lateral region of the magnetic recording medium disk D is shown. Is applied to the bimorph-shaped piezoelectric element forming the second support arm 10 so that the second support arm 10 is directed upward from the base to the tip. After the tilted state, the carriage 21 is rotated by a drive mechanism (not shown) so that the floating magnetic head H is located above the magnetic recording medium disk D, and then the second support arm 10 is configured. The voltage supplied to the existing bimorph type piezoelectric element is set to zero.

As described above, the second support arm 10 is substantially parallel to the disk surface 1 of the magnetic recording / reproducing medium when the supply voltage to the bimorph type piezoelectric element forming the second support arm 10 is zero. If the magnetic recording medium disk D does not exist if the base portion 10a is attached to the attachment member 6 by the screw 11 so that the state is brought into the state, the first support in the support portion of the floating magnetic head is performed. Arm 4
Is held by a member 17 attached to the second support arm 10 to limit the maximum distance between the first support arm 4 and the second support arm 10, as shown in FIG. In this state, the tip of the magnetic recording medium is inclined downward. However, the floating magnetic head H is positioned above the magnetic recording medium disk D that is rotating at a high speed at a predetermined rotation speed. As shown in FIG. 4, when the second support arm 10 is tilted upward from the base portion to the distal end portion as shown in FIG. When the voltage to be supplied is set to 0 as shown in FIG.
The support arm 10 is located substantially parallel to the magnetic recording / reproducing medium disc surface 1 and is separated from the member 17 with respect to the first support arm 4 with respect to the gimbal spring 3
A lift force is applied to the air bearing surface 2a of the slider portion 2 of the flying magnetic head H mounted via the magnetic head H by a thin layer air flow on the surface 1 of the magnetic recording medium disk D in a constant speed rotation state, By applying a pressing force to the slider section 2 via the pressing force transmission member 16 and the pivot, the flying magnetic head H has a floating surface 2a of the slider section 2 which is a magnetic recording medium circle. It floats on the board 1.

By the way, the bimorph type piezoelectric element forming the second supporting arm 10 of the supporting portion of the floating magnetic head operates as a capacitor having a large electrostatic capacity (for example, 600 nF). Therefore, when the resistor R is connected in the middle of the connection line with the power supply circuit for supplying the operating voltage to the piezoelectric element as shown in FIGS. 3 to 6, the operation of the piezoelectric element is Capacitance (eg 600n
F) and the resistance value R of the resistor R described above causes the second support arm 10 to perform a displacement operation at a speed according to the time constant τ = RC. When the electrostatic capacity of the bimorph type piezoelectric element is, for example, 600 nF, and the resistance value of the resistor R is 600 KΩ, the time constant is 0.
In the case of the above example, the second supporting arm 10 of the supporting portion of the floating magnetic head has a displacement speed corresponding to a time constant of 0.36 seconds when a control voltage for driving is supplied to the second supporting arm 10. Will be displaced by.

As described above, the second supporting arm 10 in the supporting portion of the floating magnetic head, which is driven and displaced by supplying the driving control voltage, has its mass, stiffness, and mechanical resistance components. Since a mechanical vibration system is constituted by, etc., a resonance phenomenon occurs due to a mechanical resonance frequency unique to the mechanical vibration system. When the drive voltage for displacing the bimorph type piezoelectric element forming the second support arm 10 is supplied, if the resistor R is interposed, the voltage is applied to the bimorph type piezoelectric element. Since the applied voltage value rises in accordance with the above time constant, the displacement of the bimorph type piezoelectric element also occurs gently on the time axis.
0 is not applied to the mechanical vibration system of 0, and therefore the second support arm 10 is displaced while suppressing the resonance phenomenon of the mechanical vibration system of the second support arm 10. You can

As described above, the fact that the second support arm 10 can be displaced while suppressing the resonance phenomenon of the mechanical vibration system of the second support arm 10 means that the load-on operation and the load-off operation are performed. When switching between operation and operation, it is possible to operate each component of the supporting part of the floating magnetic head without generating unnecessary mechanical vibration. It is possible to prevent an accident such as damage of the flying magnetic head H and the magnetic recording medium disk surface 1 from colliding with each other at the time of switching between the load-off operation and the operation. Then, the capacitance value C of the bimorph piezoelectric element that constitutes the second support arm 10 of the support portion of the floating magnetic head.
And a value of a time constant τ = RC, which is determined by a resistance value R of a resistor connected in the middle of a connection line with a power supply circuit for supplying an operating voltage to the piezoelectric element, It has been found from the results of experiments that good results are obtained by setting the primary resonance frequency value of the mechanical vibration system of the second support arm 10 to ⅛ or more of the corresponding period.

In FIGS. 3 to 6, 23 is a changeover switch, v is a movable contact, P is a fixed contact to which a positive voltage is supplied, M is a fixed contact to which a negative voltage is supplied, and Z. Is a fixed contact to which a zero voltage (ground potential) is connected. In FIGS. 3 to 6, the movable contact v in the changeover switch 23 is connected to each of the fixed contacts P, M and Z described above. The displacement mode of the 2nd support arm 10 is shown. 3 to 5 show the operation in the case where the supporting portion of the floating magnetic head has the configuration shown in FIG. 1, and FIG. 6 shows the operation of the supporting portion of the floating magnetic head as shown in FIG. The operation for the case of the configuration shown in FIG. FIG. 5 shows a case where the second supporting arm 10 is displaced in a direction in which the magnetic recording medium disk D does not exist and is inclined downward. In this case, the second supporting arm 10 is a floating magnetic field. A member 17 attached to the second support arm 10 for limiting the maximum distance between the first support arm 4 and the second support arm 10 in the first support arm 4 in the support portion of the head. In the state of being held by, it is in a state of inclining downward toward the tip side thereof.

Further, from the state where the floating magnetic head H is located above the magnetic recording medium disk D which is rotating at a high speed at a predetermined number of revolutions, the second support arm 10 is moved from the base to the tip as shown in FIG. When it is tilted so as to be directed downward toward the upper part of the slider, the flying surface 2a of the slider portion 2 of the flying magnetic head H attached to the first support arm 4 via the gimbal spring 3 is fixed. The lift force applied by the thin layer airflow on the surface 1 of the magnetic recording medium disk D in the high-speed rotation state and the pressing force applied to the slider section 2 via the pressing force transmission member 16 and the rotation fulcrum are applied. As a result, the flying surface 2a of the slider portion 2 of the flying magnetic head H floats above the magnetic recording medium disk surface 1. Then, by changing the degree of the downward tilted state from the base portion to the tip portion of the second support arm 10, the magnetic recording medium disk surface 1 and the floating surface 2a of the slider portion 2 in the floating magnetic head H are changed. The distance (flying height) to and can be changed.

FIG. 7 is a diagram showing the states of the envelopes of the output signals of the magnetic recording / reproducing apparatus during the load-on operation and the load-off operation in the magnetic recording / reproducing apparatus of the present invention. In FIG. 7, the horizontal axis represents time. The vertical axis represents the reproduction signal output. FIG. 7A shows a change state of the reproduction signal output when the floating magnetic head H approaches the magnetic recording / reproducing disk surface 1 when the load is on, and FIG. 7B shows the floating type when the load is off. 7 shows a change state of the reproduction signal output when the magnetic head H is gradually separated from the magnetic recording / reproducing disk surface 1, but a waveform in which any irregularities shown in FIGS. 7A and 7B are not recognized. As can be seen from the figure, the flying magnetic head H does not collide with the magnetic recording / reproducing disk surface 1 during the load-on operation and the load-off operation in the magnetic recording / reproducing apparatus of the present invention. However, this is because in the magnetic recording / reproducing apparatus of the present invention, a pressing force corresponding to the flying height of the floating magnetic head H is applied to the slider portion 2 to realize a stable flying state, and the magnetic recording / reproducing disc surface. Ascend to 1 The magnetic head H
It means that the allowable value of the degree of non-parallelism between the magnetic recording medium disk surface 1 and the air bearing surface 2a of the slider portion 2 in the flying magnetic head H is also large when they are close to each other.

FIG. 6 shows the supply voltage to the supporting portion of the floating magnetic head shown in FIG. 2, that is, the bimorph type piezoelectric element forming the second supporting arm 10 in the supporting portion of the floating magnetic head. In the state of 0, the first
The air bearing surface 2a of the slider portion 2 of the flying type magnetic head H attached to the supporting arm 4 of the magnetic recording medium disk surface 1 by a few μm above the magnetic recording medium disk surface 1 in the stopped state. In order to make it parallel to
The base portion 10a of the second support arm 10 is attached to the attachment member 6A with the screw 11 so that the distal end portion of the second support arm 10 is inclined upward as compared with the base portion. The movable contact v of the changeover switch 23 with respect to the bimorph type piezoelectric element that constitutes the second support arm 10 of the support portion of the floating magnetic head configured as described above.
It shows a state in which 0V is applied via the fixed contact Z and the fixed contact Z.

FIG. 10 shows a bimorph type piezoelectric element forming the second supporting arm 10 in the supporting portion of the floating magnetic head shown in FIG. 2, as shown in FIG. When 0 V is supplied, the voltage applied to the piezoelectric element and the pressing force generated in the slider portion 2 when the air bearing surface 2a of the slider portion 2 in the flying magnetic head H is in the vicinity of the disk surface of the magnetic recording medium. 3 for the bimorph type piezoelectric element that constitutes the second support arm 10 like the support portion of the floating magnetic head shown in FIG. 0V as shown
Is supplied to the slider unit 2 in the flying magnetic head H.
2 shows the B curve showing the measured value of the relationship between the voltage applied to the piezoelectric element and the pressing force generated in the slider portion 2 when the air bearing surface 2a of the above is located below the disk surface of the magnetic recording medium. It is a figure.

Looking at the A curve shown in FIG. 10, the second portion in the supporting portion of the floating magnetic head shown in FIG.
When 0 V is supplied to the bimorph type piezoelectric element forming the support arm 10 of FIG. 2, the pressing force on the slider portion 2 in the flying magnetic head H is 0, and FIG.
When + 16V is supplied to the bimorph type piezoelectric element forming the second support arm 10 in the supporting portion of the floating magnetic head shown in FIG.
The pressing force on the slider portion 2 at about 5 gr is about 5 gr. Further, looking at the B curve shown in FIG. 10, the second support arm is similar to the support portion of the floating magnetic head shown in FIG. When 0V is supplied to the bimorph type piezoelectric element that constitutes No. 10, the pressing force to the slider portion 2 in the flying magnetic head H is 3 gr.
When + 16V is supplied to the bimorph type piezoelectric element forming the second support arm 10 in the supporting portion of the floating magnetic head shown in FIG. The pressing force is about 8 gr.

Referring to the curve B in FIG. 10, supplying a predetermined voltage to the bimorph type piezoelectric element forming the second supporting arm 10 in the supporting portion of the floating magnetic head shown in FIG. Thus, it can be seen that the pressing force required to sufficiently suppress the acceleration fluctuation of the movement of the floating magnetic head H is obtained. Further, in the case of using the supporting portion of the flying type magnetic head shown in FIG. 1,
The flying surface 2a of the slider portion 2 of the flying magnetic head H
It can be seen that it is necessary to supply a voltage of -9 V or more to the bimorph type piezoelectric element forming the second support arm 10 in order to separate the magnetic recording medium from the disk surface 1 of the magnetic recording medium.

By the way, a predetermined voltage is supplied to the bimorph type piezoelectric element which constitutes the second support arm 10 in the supporting portion of the floating magnetic head, and the slider portion 2 in the floating magnetic head H is supplied. In order to obtain the applied pressing force with good reproducibility, a specific voltage is applied to the above-mentioned bimorph type piezoelectric element so that the second support arm 10 occupies a specific spatial position. Then, another specific voltage is applied to the bimorph-type piezoelectric element forming the second support arm 10 so that the second support arm 10 occupies another specific spatial position. When applying, once the piezoelectric element in the bimorph form is short-circuited by the resistor R as shown in FIGS. 3 and 6, and then the second support arm is provided as shown in FIG. 10 is a magnetic recording medium As shown in FIG. 4, a negative voltage is applied and held so as to displace the second support arm 10 so that the second support arm 10 is displaced farthest from the disk surface 1, and the hold point of the negative voltage is held. It is necessary to apply a voltage such that the air bearing surface 2a of the slider portion 2 of the flying magnetic head H can be brought closer to the disk surface of the magnetic recording medium.

That is, the second support arm 10 is shown in FIG.
Immediately after the second support arm 10 does not occupy the spatial position shown in FIG. 4 from the spatial position shown in FIG. The bimorph type piezoelectric element forming the second support arm 10 with a specific voltage so that the second support arm 10 occupies the spatial position as shown in FIG. , The pressing force applied to the slider portion 2 in the floating magnetic head H becomes smaller than the pressing force value shown in FIG. That is, there is a hysteresis characteristic in the relationship between the movement of the bimorph type piezoelectric element forming the second support arm 10 and the distance between the second support arm 10 and the magnetic recording medium disk surface 1.
Since the distance between the second support arm 10 and the magnetic recording medium disc surface 1 is influenced by the state of the voltage applied to the bimorph type piezoelectric element constituting the support arm 10 of FIG. This is because the position of the distance between the second support arm 10 and the magnetic recording medium disc surface 1 is not determined by the newly applied voltage.

Therefore, when a voltage different from the voltage applied up to that time is applied to the bimorph type piezoelectric element forming the second support arm 10, once the voltage shown in FIG.
As shown in FIG. 6, by short-circuiting the bimorph type piezoelectric element with the resistor R, the distance position between the second support arm 10 and the magnetic recording medium disc surface 1 is changed by the newly applied voltage. Can be independent of the state of the previously applied voltage. Note that FIG.
In FIG. 4, the reference voltage on the negative side in FIG. 4 is set to −16V, but if the reference voltage is changed to −10V or −12V, the states of the curves A and B in FIG. 10 naturally change.

As is clear from the above description, in the magnetic recording / reproducing apparatus of the present invention, the NCSS system is used without contacting the air bearing surface 2a of the slider portion 2 of the flying magnetic head H with the magnetic recording medium disk surface 1. Load on,
Since the load can be turned off, it is possible to use the magnetic recording medium disk D in which the surface of the magnetic recording medium is a mirror surface. That is, in the usual conventional magnetic recording / reproducing apparatus, the magnetic recording medium disc surface 1
Since the air bearing surface of the slider portion of the flying magnetic head H is kept in contact with the flying magnetic head H, when the magnetic recording medium disk whose magnetic recording medium surface is a mirror surface is used, Since the air bearing surface is attracted to the mirror-like magnetic recording medium surface and the device cannot be used next, the conventional device uses a magnetic recording medium disk with a textured magnetic recording medium surface. An air layer is formed between the disk surface of the magnetic recording medium and the air bearing surface of the slider portion of the flying magnetic head H,
The flying surface of the slider portion of the flying magnetic head H and the surface of the magnetic recording medium are prevented from sticking to each other.

However, when a magnetic recording medium disk with a textured magnetic recording medium surface is used, the flying surface of the slider portion of the flying magnetic head H is floated close to the magnetic recording medium disk surface. In many cases, the magnetic head was operated with a flying height of, for example, 0.08 μm or more, resulting in a large magnetic recording / reproducing loss.
Therefore, it has been difficult to realize high-density recording and reproduction. On the other hand, as described above, in the magnetic recording / reproducing apparatus of the present invention, the air bearing surface 2a of the slider portion 2 in the flying magnetic head H is
Since the magnetic recording medium disk 1 operates without contacting the disk surface 1, even if the magnetic recording medium disk D whose surface is a mirror surface is used, the flying surface of the slider portion of the flying magnetic head H and the mirror surface Since the magnetic recording medium surface does not stick to the magnetic recording medium surface, it is not necessary to use a magnetic recording medium disk having a texture on the magnetic recording medium surface, and oil coating is performed by applying oil to the magnetic recording medium surface. No need.

As described above, the magnetic recording of the present invention uses the magnetic recording medium disk D having the mirror-like magnetic recording medium disk surface 1 without using the magnetic recording medium disk having the magnetic recording medium surface textured. In the reproducing apparatus, the flying type magnetic head H can be moved to a further lower flying position to perform a high density recording / reproducing operation. Further, when using a magnetic recording medium disc D having a mirror-like magnetic recording medium disc face 1 to cause a levitation type magnetic head to fly to a level of 0.05 μm, the specular magnetic recording medium disc face 1 is used. When the oil coating is applied, the oil on the disk surface 1 of the magnetic recording medium having a mirror surface is soaked between the air bearing surfaces of the slider portion 2 in the flying magnetic head H, and finally the air bearing surface 2a is cleaned. Since it has a function, the mirror-like magnetic recording medium disk surface 1
Use a magnetic recording medium disk with no oil applied on top. Further, when the slider portion 2 of the magnetic head H is made of an AlTiC material, stable flying operation can be realized with a flying height of 0.05 μm, and the running operation is performed by repeating load-on and load-off by the NCSS method. However, stable recording / reproducing operations could be performed without dust on the air bearing surface 2a of the slider portion 2 of the flying magnetic head H or damage to the magnetic recording medium disk surface 1. As the magnetic film of the magnetic recording medium disk D, Hc
When a magnetic film of 2000 Oe was used and the levitation type magnetic head was made to fly in the range of 0.05 μm, the magnetic film of Hc of 2000 Oe was sufficiently saturated and recorded.
There is also a possibility of recording / reproducing with respect to the magnetic recording medium disk D provided with a magnetic film having c of 2000 Oe or more.

[0063]

As is apparent from the above detailed description, the magnetic recording / reproducing apparatus of the present invention has a thin layer gas between the disk surface of the magnetic recording medium and the air bearing surface of the slider portion of the floating magnetic head. The floating magnetic head that is floated on the disk surface of the magnetic recording medium by the lift force generated on the air bearing surface of the slider portion by the flow is supported by the gimbal spring provided near the tip of the first support arm. The above-mentioned rotation fulcrum from the first support arm with which the tip of the rotation fulcrum provided near the center of the surface of the slider part of the floating magnetic head opposite to the air bearing surface side is in contact. A pressing force is applied to the slider portion of the floating magnetic head via the magnetic head, and the slider is arranged side by side with the first support arm at a distance from the slider. There's nothing to do with wobbling A second support arm composed of a bimorph-shaped piezoelectric element controlled to be fixed in a predetermined space position with a spring so as to reduce the distance between the second support arm and the second support arm. The first support arm and the second support arm are provided between the first support arm being biased and the first support arm and the second support arm in the vicinity of the position of the rotation fulcrum. Is urged in such a direction that the distance between the first support arm and the second support arm changes in accordance with the distance between the first support arm and the second support arm. The pressing force applied to the slider portion of the floating magnetic head is transmitted through the pressing force transmitting member capable of turning a small bending amount into a large pressing force and the rotation fulcrum. 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 vibration of the floating magnetic head can be reduced. , Are arranged side by side with respect to the first support arm, and are controlled so as to be fixed at a predetermined spatial position irrespective of the surface wobbling of the magnetic recording medium disk surface during a recording / reproducing operation. A voltage having a predetermined magnitude and polarity corresponding to the rotational operation state of the magnetic recording medium disk is supplied to the bimorph-type piezoelectric element with respect to the second support arm that is configured by the bimorph-type piezoelectric element. By
The distance from the disk surface of the magnetic recording medium to the floating magnetic head can be easily changed in a predetermined manner, and the time during which the member is displaced when the distance changes is
The second portion of the supporting portion of the floating magnetic head described above takes at least 1/8 of the period corresponding to the primary resonance frequency value in the mechanical vibration system of the floating magnetic head and the first supporting arm portion. The displacement of the support arm of the vehicle between two spatial positions, and
Since the member for limiting the maximum value of the distance between the first support arm and the second support arm is provided in the second support arm,
The operation of the CSS system can be stably and reliably performed, and the present invention can solve the above-mentioned drawbacks of the conventional technique.

[Brief description of drawings]

FIG. 1 is a side view of a magnetic recording / reproducing apparatus of the present invention.

FIG. 2 is a side view of the magnetic recording / reproducing apparatus of the present invention.

FIG. 3 is a partial side view for explaining the operation of the magnetic recording / reproducing apparatus of the present invention.

FIG. 4 is a partial side view for explaining the operation of the magnetic recording / reproducing apparatus of the present invention.

FIG. 5 is a partial side view for explaining the operation of the magnetic recording / reproducing apparatus of the present invention.

FIG. 6 is a partial side view for explaining the operation of the magnetic recording / reproducing apparatus of the present invention.

FIG. 7 is a waveform example diagram for explaining the operation of the magnetic recording / reproducing apparatus of the present invention.

FIG. 8 is a plan view showing an operating state of a part of the magnetic recording / reproducing apparatus of the present invention.

FIG. 9 is a characteristic curve example diagram for explaining a part of the operation of the magnetic recording / reproducing apparatus of the present invention.

FIG. 10 is an example diagram of a characteristic curve of a bimorph type piezoelectric element.

[Explanation of symbols]

D ... Magnetic recording medium disk (magnetic disk), H ... Flying type magnetic head, 2 ... Flying type magnetic head H slider section, 2a
... air bearing surface, 3 ... gimbal spring, 4 ... first support arm,
5 ... Rotation fulcrum, 6 ... Mounting member, 8 ... Spacer, 10 ... Second support arm, 12 ... Shim, 13, 14 ... Piezoelectric element,
15 ... Glass thin plate, 16 ... Pressing force transmitting member, 16a ...
Semi-circular bent portion, 18, 19 ... Connection line, 23 ... Changeover switch,

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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] 0024

[Correction method] Change

[Correction content]

For example, when the spatial position of the second support arm 10 approaches the magnetic recording medium disk surface 1, the pressing force applied to the floating magnetic head H increases and the flying magnetic head H is moved. If the flying height decreases and the spatial position of the second support arm 10 is far from the magnetic recording medium disk surface 1, the pressing force applied to the floating magnetic head H decreases and the floating type The flying height of the magnetic head H will increase. FIG. 1B shows a direction in which the second support arm 10 is separated from the magnetic recording medium disk surface 1 with respect to the bimorph-shaped piezoelectric elements 13 and 14 which form the second support arm 10. The first support arm 4 and the second support arm 1 in the case where a voltage having a polarity and a magnitude that causes a large displacement is supplied via the connection lines 18 and 19
The state with 0 is shown.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0025

[Correction method] Change

[Correction content]

By the way, the pressing force transmitting member 1 provided between the first supporting arm 4 and the second supporting arm 10.
6 and the elastic force of the spring 4b provided near the base 4a of the first support arm 4, the elastic force of the pressing force transmitting member 16 is larger than the elastic force of the spring 4b, and The elastic force of the pressing force transmission member 16 is such that the distance between the first support arm 4 and the second support arm 10 is increased, and the first support arm 4 and the second support arm 10 are attached. The elastic force of the spring 4b is applied to the first support arm 4
The first support arm 4 and the second support arm 10 are urged in such a direction that the distance between the first support arm 4 and the second support arm 10 is small. When the second support arm 10 and the second support arm 10 are in a state as shown in FIG. 1B, the air bearing surface 2a of the slider portion 2 of the flying magnetic head H is largely separated from the magnetic recording medium disc surface 1. The flying surface 2a of the slider portion 2 of the flying magnetic head H.
When the lift force generated by the gas flow is so small as to be negligible, the distance between the first support arm 4 and the second support arm 10 is increased by the elastic force of the pressing force transmission member 16 described above. The member 17 for limiting the maximum value of the distance between the first support arm 4 and the second support arm 10 extends to the maximum distance at which the first support arm 4 strikes.

Claims (2)

[Claims] 1. A gimbal spring, to which a floating magnetic head is attached, is provided side by side with a base portion of a first support arm fixed to the vicinity of a front end portion thereof and the first support arm with a space therebetween. And the base of the second support arm formed of a bimorph type piezoelectric element is fixed to a common mounting member in a state of being electrically insulated from each other, so that the floating portion of the flying type magnetic head is lifted. The tip end portion of the rotation fulcrum provided near the central portion of the surface opposite to the surface side is brought into contact with the first support arm by the elastic force of the gimbal spring described above, and levitated via the rotation fulcrum described above. A pressing force is applied to the slider section of the magnetic head of the magnetic head, and the spring provided near the base of the first support arm reduces the distance between the first support arm and the second support arm. Direction first The first supporting arm is urged, and the first supporting arm and the second supporting arm are provided between the first supporting arm and the second supporting arm near the position of the rotation fulcrum. And a member for limiting the maximum value of the gap between the second support arm and the first support arm, and a second support arm. The set position in the predetermined space of the support part of the floating magnetic head and the second support arm in the support part of the floating magnetic head described above corresponds to the rotational operation state of the magnetic recording medium disk. A magnetic recording / reproducing apparatus comprising means for controlling the magnitude and polarity of the voltage supplied to the bimorph-type piezoelectric element forming the above-mentioned second support arm so as to be changed. 2. A gimbal spring, to which a floating magnetic head is attached, is provided side by side with a base portion of a first support arm fixed to the vicinity of a tip end portion thereof and the first support arm. And a base portion of the second support arm formed of a bimorph type piezoelectric element is fixed to a common mounting member in a state of being electrically insulated from each other, so that the floating portion in the slider portion of the floating magnetic head is levitated. The tip end of the rotation fulcrum provided near the center of the surface opposite to the surface side is brought into contact with the first support arm by the elastic force of the gimbal spring described above, and floats through the rotation fulcrum described above. A pressing force is applied to the slider section of the magnetic head of the magnetic head, and the spring provided near the base of the first support arm reduces the distance between the first support arm and the second support arm. Direction first The first support arm is urged, and the first support arm and the second support arm are provided between the first support arm and the second support arm near the position of the rotation fulcrum. A pressing force transmitting member for urging in a direction to increase the distance is provided, and a member for limiting the maximum value of the distance between the second supporting arm and the first supporting arm is provided in the second supporting arm. And the set position of the second supporting arm in the supporting portion of the floating magnetic head described above in a predetermined space, the floating type when the floating magnetic head is in a load-on state and in a standby state. At least one-eighth of the period corresponding to the primary resonance frequency value in the mechanical vibration system of the second supporting arm portion in the supporting portion of the floating magnetic head when the operating state is changed between when the magnetic head is loaded off Over The bimorph type piezoelectric element constituting the second support arm is supplied so that the displacement operation between the two spatial positions of the second support arm in the support portion of the floating magnetic head described above is performed. A magnetic recording / reproducing apparatus comprising means for controlling the magnitude and polarity of voltage.