JPH0737345A - Load/unload mechanism for magnetic head - Google Patents

Abstract

PURPOSE:To obtain a high response speed, wide control freedom and highly stable operation by providing a lever-type power transmission means, which amplifies the displacement amount of a piezo-electric element and transmits it to the side of a magnetic head, and controls the movement of the magnetic head. CONSTITUTION:When a driving source (piezo-electric element) 4 is driven, a protruding shaft 4a protrudes downward. Then, a working member 11 is pushed downward with the shaft 4a, and the member 11 is turned downward with a position P1 as a supporting point being accompanied with the elastic deformation of a plate spring 12. When the member 11 is turned downward, a working member 21 is pushed downward by a protruding shaft 13, and the member 21 is turned downward with a position P2 as a supporting point being accompanied with the elastic deformation of a plate spring 22. Thus, a load/unload arm 19 is moved downward together with a load/unload pin 17, and at the same time, a suspension 2 is moved downward. A magnetic head 1 is arranged at the load position close to a magnetic track. Thus, the displacement amount of the protruding shaft 4a, which is transmitted to the head 1 through the shaft 4a, the lever parts 9 and 10 and the arm 19, is aimplified, and the head is largely moved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loading position in which a magnetic head in a magnetic recording device such as a hard disk used as an external storage device of a computer is close to a recording track on a magnetic recording medium, and an unloading position greatly separated from the loading position. The present invention relates to a load / unload mechanism for switching and moving to and.

[0002]

2. Description of the Related Art In a magnetic recording device such as a hard disk used as an external storage device of a computer, a magnetic head is placed at an unload position largely apart from a recording track on a magnetic recording medium when a writing / reading operation is not performed. In addition, a so-called Non-CSS method is adopted in which the writing / reading is moved to a loading position close to the recording track.

FIG. 4 is a side view showing an example of a load / unload mechanism of a magnetic head in a conventional magnetic recording apparatus. In FIG. 4, the load / unload mechanism is roughly composed of a pulse motor 51 as a drive source, a cam 52, a cam floor 53, a guide element 54, a load / unload arm 55, and the like. 55 through the suspension 56 on the magnetic head 5
7 is listed.

More specifically, the pulse motor 51 is attached to a base 59 via a holder 58,
A cam 52 is integrally rotatably attached to a rotary shaft 60 of the pulse motor 51.

The guide element 54 is arranged on a guide member 61 attached to a base 59 so as to be vertically movable. A cam floor 53 is attached to the guide element 54 in a state of being in contact with the cam 52. When the cam floor 53 moves up and down by the rotation of the cam 52, the guide element 54 moves up and down together with the cam floor 53. It has a moving structure. In addition, a load / unload arm 55 that is vertically moved integrally with the guide element 54 is attached to the guide element 54.

The suspension 56 is always urged downward and abuts on the load / unload arm 55, and is vertically moved together with the load / unload arm 55. At this time, the suspension 56 is moved. The magnetic head 57 is also in a state of moving up and down together.

In the load / unload mechanism thus constructed, when the pulse motor 51 is rotated, this rotation is converted into vertical movement by the cam 52 and the cam floor 53,
The loading / unloading arm 55 moves up and down together with the guide element 54. Then, this load / unload arm 5
The suspension 56 supporting the magnetic head 57 by 5 also moves up and down. When the suspension 56 moves upward, the magnetic head 57 moves to a load position close to a recording track on a magnetic recording medium (not shown), and when it moves downward, it moves to an unload position largely separated from the recording track. Will be done.

[0008]

In the conventional load / unload mechanism described above, the pulse motor 51, which is a rotary electric machine, is used as a drive source for moving the magnetic head 57. There was a problem that it took a long time to start and the response speed was slow.

Since the load / unload operation is obtained by the rotating cam 52 and the cam floor 53,
There is a problem that it is not possible to give arbitrary operating characteristics unless the cam 52 is replaced.

Further, since the suspension 56 is supported by the tangent line on the upper surface of the cantilevered load / unload arm 55, the posture of the suspension 56 is disturbed when the load / unload arm 55 is moved up and down. There was a problem called.

The present invention has been made in view of the above problems, and an object thereof is to provide a load / unload mechanism for a magnetic head capable of obtaining a high response speed, a wide degree of control freedom, and a highly stable operation. To provide.

[0012]

According to the present invention, there is provided a load for switching and moving a magnetic head between a load position close to a recording track on a magnetic recording medium and an unload position largely separated from the magnetic recording medium. In the unload mechanism, the piezoelectric element and the piezoelectric element are swingably arranged about a specific position as a fulcrum, the piezoelectric element is connected to one end side and the magnetic head is connected to the other end side, This is achieved by including a lever type power transmission means that receives the displacement amount of the piezoelectric element at the one end side, amplifies and transmits the displacement amount to the magnetic head side, and controls the movement of the magnetic head. Further, preferably, a laminated piezoelectric element is used as the piezoelectric element. More preferably, the actuating member and the piezoelectric element may be connected by point contact. Also,
It is more preferable that the magnetic head is attached to the suspension that is biased toward the unload position, and that the actuating member receives the biasing force of the suspension at a point and is connected so as to be integrally movable.

It is another object of the present invention to provide a load / unload mechanism for switching and moving the magnetic head between a load position close to a recording track on a magnetic recording medium and an unload position widely separated. In, a drive source, an operating member having the drive source connected to one end side thereof and the magnetic head connected to the other end side thereof, and the operating member disposed at a specific position in a state of intersecting each other. A leaf spring member having first and second leaf spring pieces that are swingably cantilevered from a direction parallel to the actuating member and a direction perpendicular to the actuating member. This is achieved by controlling the movement of the magnetic head by amplifying the vibration of the member and transmitting it to the magnetic head side. More preferably, a plurality of the leaf spring pieces are laminated and provided. Further, the end portions of each of the laminated leaf spring pieces may be fixed by a common fixing member, and the fixing member is preferably a driving pin. In addition, the actuating member and the drive source are preferably connected by point contact.

Another object of the present invention is to provide a load / unload mechanism for switching and moving the magnetic head between a load position close to a recording track on a magnetic recording medium and an unload position largely separated from the recording track. In, a piezoelectric element, an operating member having the piezoelectric element connected to one end side thereof and the magnetic head connected to the other end side thereof, and the operating member disposed at a specific position in a state of intersecting each other. A plate spring member having first and second plate spring pieces that are swingably cantilevered from a direction parallel to the actuating member and a direction perpendicular to the actuating member. This is achieved by controlling the movement of the magnetic head by amplifying the vibration of the member and transmitting it to the magnetic head side.

Another object of the present invention is, in the present invention, a load / unload mechanism for switching and moving the magnetic head between a load position close to a recording track on a magnetic recording medium and an unload position widely separated. In a direction parallel to the actuating member, the drive source, the first actuating member having one end connected to the actuating member, and the actuating member disposed at a specific position in a state of intersecting each other. First and second cantilevers that can swing from right angles
A first leaf spring member having a leaf spring piece and a second actuation member connected to the first actuation member at one end side and the magnetic head connected to the other end side. First and second plates arranged in a specific position in such a state that the second actuating member is cantilevered in a direction perpendicular to the direction parallel to the second actuating member. A second plate spring member having a spring piece, and a displacement amount of the drive source is amplified by the swing of the first operating member and the swing of the second operating member to the magnetic head side. This is achieved by transmitting and controlling the movement of the magnetic head. Preferably, the first operating member and the drive source, and the first operating member and the second operating member are connected by point contact.

[0016]

According to this structure, a high response speed can be obtained when the piezoelectric element is used as the drive source. Further, when a laminated piezoelectric element is used as the piezoelectric element, a large amount of displacement can be generated on the piezoelectric element side, and thus a wide degree of control freedom can be obtained.

Further, when the actuating member and the piezoelectric element are connected by point contact, it is possible to reduce the disturbance of the posture of the actuating member when the actuating member swings due to the displacement of the piezoelectric element.

Further, when the actuating member receives the biasing force of the suspension to which the magnetic head is attached at the point, when the suspension is moved by the swing of the actuating member, the disturbance of the suspension posture is reduced. be able to.

Further, the first and second members are arranged at specific positions in a state of intersecting with each other and cantilever the operating member in a direction perpendicular to the direction parallel to the operating member. In the case of including the leaf spring member having the leaf spring piece, only the rotational displacement is generated in the actuating member, and the movement expansion efficiency can be increased. Further, by using the leaf spring members in an overlapping manner, it is possible to obtain the damping property due to friction during movement, and it is possible to stabilize the load / unload operation.

[0020]

Embodiments of the present invention will be described in detail below with reference to the drawings. 1 to 3 show a load / load according to the present invention.
1 shows an embodiment of an unloading mechanism, FIG. 1 is a perspective view showing the configuration of the main part thereof, FIG. 2 is a front view thereof, and FIG. 3 is a side view taken along the line AA of FIG.

1 to 3, the loading / unloading mechanism comprises a carrier (not shown) to which a suspension 2 supporting a magnetic head 1 is attached.
The base 3 is movably attached to the carrier, and the drive source 4 and the power transmission means 5 are mounted on the base 3.
It has a schematic structure with attached.

More specifically, the drive source 4 is a laminated piezoelectric element formed by laminating a plurality of piezoelectric elements. The drive shaft 4 is mounted on the base 3 by holders 6, 7, and 8. It is installed. Further, a protruding shaft 4a having a substantially spherical tip is projected from the lower side of the drive source 4, and when the piezoelectric elements are operated, the sum of the amounts of displacement of the laminated piezoelectric elements is summed. The protruding shaft 4a is structured to protrude by an amount corresponding to the above. The piezoelectric element has a built-in displacement sensor and performs "closed loop control".
It is also controlled by analog commands.

The power transmission means 5 includes a first lever portion 9 and a second lever portion 9.
The lever unit 10 is provided.

Further, the first lever portion 9 is composed of a first actuating member 11 and a first leaf spring member 12.

Of these, the first operating member 11 is the drive source 4
It is arranged so as to lie horizontally below and is formed as an elongated block piece.

On the other hand, the first leaf spring member 12 comprises a first leaf spring piece 12A and a second leaf spring piece 12B. One end of the first leaf spring piece 12A is fixed to the lower surface at one end of the first actuating member 11 by tightening with bolts and a driving pin, and the other end is fixed to the upper surface of the holder 15 which is attached to the base 3. It is fixed by tightening with bolts and driving pins. On the other hand, one end of the second leaf spring piece 12B is fixed to the end face of the first actuating member 11 on the one end side by tightening with bolts and a driving pin.
The other end is fixed to the side surface of the holder 15 by tightening with bolts and a driving pin.

Therefore, the first leaf spring piece 12A and the second leaf spring piece 12B are arranged between the one end side of the first actuating member 11 and the holder 15 while intersecting each other. As a result, the first actuating member 11 performs only rotational displacement along the surface of the base 3 with the specific position P1 where the first leaf spring piece 12A and the second leaf spring piece 12B intersect as a fulcrum. Be seen. The tip end of the protruding shaft 4a of the drive source 4 is always abutted on the upper surface of the first actuating member 11 so as to be in point contact, and the other end of the first actuating member 1 ( On the (free end) side, a protruding shaft 13 formed of an adjusting screw having a substantially spherical tip is attached so as to project downward.

Here, the first leaf spring piece 12A and the second leaf spring piece 12A
In order to obtain a large displacement angle and a damping property due to friction, the leaf spring pieces 12B are used by stacking a plurality of leaf springs of phosphor bronze or the like (two in this embodiment) and using each leaf spring. The both ends of the pieces 12A and 12B are fixed by the driving pin in addition to the fixing by the bolt as described above to prevent the shift during the operation.

On the other hand, the second lever portion 10 is composed of the second actuating member 21 and the second leaf spring member 22, and is overlapped with the lower side of the first lever portion 9. And the base 3 in the direction opposite to the first lever 9
Is mounted on.

Of these, the second actuating member 21 is disposed under the first actuating member 11 so as to lie horizontally with a part thereof overlapping, and is formed as an elongated block piece. ing.

On the other hand, the second leaf spring member 22 comprises a first leaf spring piece 22A and a second leaf spring piece 22B. One end side of the first leaf spring piece 22A is fixed to the lower surface at one end side of the first actuating member 21 by tightening with bolts and a driving pin, and the other end side is fixed to the upper surface of the holder 16 fixedly attached to the base 3. It is fixed by tightening with bolts and driving pins. On the other hand, the second leaf spring piece 22
B has one end side fixed to the end surface on the one end side of the second actuating member 21 with tightening bolts and a driving pin, and the other end side fixed to the side surface of the holder 16 with tightening bolts and a driving pin.

Therefore, the first leaf spring piece 22A and the second leaf spring piece 22B are arranged between the one end side of the second actuating member 21 and the holder 16 while intersecting each other. As a result, the second actuating member 21 performs only rotational displacement along the surface of the base 3 with the specific position P2 where the first leaf spring piece 22A and the second leaf spring piece 22B intersect as a fulcrum. Be seen.

Here, the first leaf spring piece 22A and the second leaf spring piece 22A
The leaf spring piece 22B of the leaf spring piece 12B of the first lever 9 is
Similar to the cases of A and 12B, in order to obtain a large displacement angle and a damping property due to friction, a plurality of leaf springs (two in this embodiment) of phosphor bronze or the like are stacked and used. The both ends of the spring pieces 22A and 22B are fixed by the driving pin as well as the fixing by the bolts as described above to prevent the shift during the operation.

The tip of the projecting shaft 13 of the first actuating member 11 is always in contact with the upper surface of the second actuating member 21 so as to be in point contact therewith. A load / unload arm 19 having a load / unload pin 17 at its tip is fixedly attached to the other end (free end) side of the member 21.
Suspension 2 is placed on the top and receives it.

As the load / unload pin 17, a piano wire having a diameter of 1.2 mm or less is used, and the tip 17a of the portion supporting the suspension 2 is sharply manufactured. Suspension 2
The bottom surface of the central portion in the width direction is supported by point contact (see FIG. 3).

In addition, in the power transmission means 5, the regulating member 1 is provided near the center of the side surface of the first lever portion 9 and the second lever portion 10.
8 is fixed to the base 3. The regulating member 18 integrally includes an upper regulating arm 18a arranged across the upper surface of the first operating member 11 and a lower regulating arm 18b arranged across the lower surface of the second operating member 21. The first actuating member 11 and the second lever portion 10 of the first lever portion 9 are provided by the upper and lower regulating arms 18a and 18b.
The vertical movement of the second operating member 21 is regulated so as to be 0.05 mm or less.

Next, the operation of the load / unload mechanism will be described. First, when the drive source (piezoelectric element) 4 is not driven, the protruding shaft 4a is displaced upward.
Thereby, the first operating member 11 and the second operating member 21
Are held by being rotationally displaced upward with the positions P1 and P2 as fulcrums by the control of the first leaf spring member 12 and the second leaf spring member 22, respectively. Further, as a result, the suspension 2 is moved upward, and the magnetic head 1 is arranged at an unload position that is far away from the recording track.

On the other hand, when the drive source 4 is driven, the protruding shaft 4
a is projected downward. Then, the first actuating member 11 is pushed downward by the projecting shaft 4a, and the first actuating member 11 is rotated downward with the position P1 as a fulcrum with the elastic deformation of the first leaf spring member 12. .

When the first operating member 11 is rotated downward, the projecting shaft 13 pushes the second operating member 11 downward, and the second operating member 21 moves the second plate spring. With the elastic deformation of the member 22, the member 22 is rotated downward about the position P2 as a fulcrum. As a result, the load / unload arm 19 is moved downward together with the load / unload pin 17, the suspension 2 is moved downward at the same time, and the magnetic head 1 is arranged at the load position close to the magnetic track.

In this way, the protruding shaft 4a, the first
When transmitted to the magnetic head 1 on the suspension 2 via the lever portion 9, the second lever portion 10 and the load / unload arm 19, the displacement amount of the protruding shaft 4a is the first lever portion 9, the second lever portion 9. The lever unit 10 and the suspension 2 are sequentially amplified to move the magnetic head 1 largely.

Next, when the drive of the drive source 4 is stopped, the protruding shaft 4a is retracted upward. Then, the first actuating member 11 and the second actuating member 21 rotate upward with the positions P1 and P2 as fulcrums by the restoring forces of the first leaf spring member 12 and the second leaf spring member 22, respectively. It is dynamically displaced and returned. At the same time, the suspension 2 is also pushed back upward by the load / unload pin 17, and the magnetic head 1 is also returned to the unload position that is far away from the recording track.

Therefore, in the load / unload mechanism of this embodiment, since the piezoelectric element is used as the driving source 4, a high response speed can be obtained. In addition, since the laminated piezoelectric element is used as the piezoelectric element, a large amount of displacement can be generated on the piezoelectric element side, and thus a wide degree of control freedom can be obtained.

Furthermore, since the first actuating member 11 and the spherical tip of the projecting shaft 4a on the drive source (piezoelectric element) 4 side are brought into contact with each other and connected by point contact, the drive source 4
When the first actuating member 11 swings due to the displacement, the disturbance of the posture of the first actuating member 11 can be reduced.

Further, the biasing force of the suspension 2 to which the magnetic head 1 is attached is received by the tip 17a of the load / unload pin 17 on the side of the second actuating member 22 in a point state. When the suspension 2 is moved by swinging the operating member 22, the disturbance of the posture of the suspension 2 can be reduced.

First operating member 11 and second operating member 21
Are arranged in a state of intersecting with each other, and the first and second leaf spring pieces are cantilevered in a direction perpendicular to a direction parallel to the respective actuating members 11 and 21. First having (12A, 22A; 12B, 22B)
Since the leaf spring member 12 and the second leaf spring member 22 are rotated at specific positions P1 and P2, only the rotational displacement occurs in the first actuating member 11 and the second actuating member 21. It is possible to increase the motion expansion efficiency. In addition, the first and second leaf spring pieces (12A, 22A; 12B,
22B) are overlapped and used, damping characteristics due to friction can be obtained during movement, and the load / unload operation can be stabilized.

[0046]

As described above, according to the load / unload mechanism of the magnetic head according to the present invention, a high response speed can be obtained when the piezoelectric element is used as the drive source. Further, when a laminated piezoelectric element is used as the piezoelectric element, a large amount of displacement can be generated on the piezoelectric element side, and thus a wide degree of control freedom can be obtained.

Further, when the actuating member and the piezoelectric element are connected by point contact, the disturbance of the posture of the actuating member can be reduced when the actuating member swings due to the displacement of the piezoelectric element.

In the case where the actuating member receives the biasing force of the suspension to which the magnetic head is attached at the point, when the suspension is moved by the swing of the actuating member, the disturbance of the suspension posture can be reduced. it can.

First and second actuators, which are arranged at specific positions in a state of intersecting with each other, cantilever the operating member in a direction perpendicular to the direction parallel to the operating member.
When the plate spring member having the plate spring piece is provided, only the rotational displacement is generated in the actuating member, and the motion expansion efficiency can be increased. Further, by using the leaf spring members in an overlapping manner, it is possible to obtain an effect that damping property due to friction can be obtained at the time of exercise and the load / unload operation can be stabilized.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main configuration of a load / unload mechanism according to the present invention.

FIG. 2 is a front view of a load / unload mechanism according to the present invention.

FIG. 3 is a side view taken along the line AA of FIG.

FIG. 4 is a side view showing an example of a conventional load / unload mechanism.

[Explanation of symbols]

 1 Magnetic Head 2 Suspension 4 Drive Source (Piezoelectric Element) 5 Power Transmission Means 9 First Lever Part 10 Second Lever Part 11 First Actuating Member 12 First Leaf Spring Member 12A First Leaf Spring Piece 12B First 2 leaf spring piece 17 load / unload pin 19 load / unload arm 21 second actuating member 22 second leaf spring member 22A first leaf spring piece 22B second leaf spring piece

Claims (12)

[Claims] 1. A load / unload mechanism for switching and moving a magnetic head between a load position close to a recording track on a magnetic recording medium and an unload position largely separated from the recording track, wherein a piezoelectric element and a specific position are used as fulcrums. The piezoelectric element is swingably arranged, the piezoelectric element is connected to one end side thereof, and the magnetic head is connected to the other end side thereof, and the displacement amount of the piezoelectric element is received at the one end side of the magnetic head. Amplify and transmit to the side,
Load / drive of a magnetic head, comprising a lever type power transmission means for controlling the movement of the magnetic head.
Unload mechanism. 2. The load / unload mechanism for a magnetic head according to claim 1, wherein a laminated piezoelectric element is used as the piezoelectric element. 3. The load / unload mechanism for a magnetic head according to claim 1, wherein the actuating member and the piezoelectric element are connected by point contact. 4. The magnetic head is attached to a suspension that is biased toward the unloading position, and the actuating member is connected so as to be integrally movable by receiving the biasing force of the suspension at a point. Item 1. A load / unload mechanism for a magnetic head according to Item 1. 5. A load / unload mechanism for switching and moving a magnetic head between a load position close to a recording track on a magnetic recording medium and an unload position largely separated from the magnetic recording medium, comprising a drive source and the drive on one end side. An operating member connected to the source and connected to the magnetic head on the other end side, and an operating member disposed at a specific position in a state of intersecting each other and perpendicular to a direction parallel to the operating member. And a leaf spring member having a first and second leaf spring piece that is cantilevered from each direction, and the displacement amount of the drive source is amplified by the swinging of the actuating member, and the magnetic head is provided. Side of the magnetic head to control the movement of the magnetic head.
Unload mechanism. 6. The load / unload mechanism for a magnetic head according to claim 5, wherein a plurality of the leaf spring pieces are laminated and provided. 7. A load / unload mechanism for a magnetic head according to claim 6, wherein the end portions of each of the plurality of laminated leaf spring pieces are fixed by a common fixing member. 8. The load / unload mechanism of the magnetic head according to claim 7, wherein a driving pin is used as the fixing member. 9. The load / unload mechanism for a magnetic head according to claim 5, wherein the actuating member and the drive source are connected by point contact. 10. A load / unload mechanism for switching and moving a magnetic head between a load position close to a recording track on a magnetic recording medium and an unload position largely separated from the magnetic recording medium, comprising: a piezoelectric element; An actuating member to which the element is connected and the magnetic head is connected to the other end, and an actuating member which is disposed at a specific position in a state intersecting with each other and which is perpendicular to a direction parallel to the actuating member. And a leaf spring member having first and second leaf spring pieces that are cantilevered from the respective directions, the displacement amount of the piezoelectric element being amplified by the swinging of the actuating member, and the magnetic head. A load / unload mechanism for the magnetic head, which is transmitted to the magnetic head to control the movement of the magnetic head. 11. A load / unload mechanism for switching and moving a magnetic head between a load position which is close to a recording track on a magnetic recording medium and an unload position which is largely separated from the magnetic recording medium, a drive source, and the drive on one end side. A first actuating member to which a source is connected, and a first actuating member which is disposed at a specific position in a state of intersecting with each other, and the actuating member is cantilevered in a direction perpendicular to a direction parallel to the actuating member A first leaf spring member having first and second leaf spring pieces, and a second leaf spring member having one end connected to the first actuating member and the other end connected to the magnetic head. And the second operating member, which is disposed at a specific position in a state where the second operating member and the second operating member intersect with each other, are cantilevered from the direction parallel to the second operating member and the direction perpendicular to the second operating member. 1st and 2nd A second leaf spring member having a leaf spring piece, wherein the displacement of the drive source is amplified by the swing of the first operating member and the swing of the second operating member, and the magnetic head side is provided. A load / unload mechanism for the magnetic head, which is transmitted to the magnetic head to control the movement of the magnetic head. 12. The magnetic head according to claim 11, wherein the first actuating member and the drive source, and the first actuating member and the second actuating member are connected by point contact. Load / unload mechanism.