These and/or other aspects and advantages of the present general inventive concept will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
Reference will now be made in detail to embodiments of the present general inventive concept, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The embodiments are described below in order to explain the present general inventive concept by referring to the figures.
The disk pack 10 may include a shaft 13 to form a rotation center of a disk 11, a spindle motor hub (not illustrated) provided outside the shaft 13 in a radial direction to support the disk 11, a spindle motor (not illustrated) to rotate the spindle motor hub, a clamp 15 coupled to the upper portion of the spindle motor hub, and a clamp screw (not illustrated) to press the clamp 15 to allow the disk 11 to be fixed to the spindle motor hub.
The PCBA 60 may include a printed circuit board (PCB, not illustrated) having a plate shape and a PCB connector 61 provided at a side of the PCB. The PCB may include a plurality of chips and circuits (not illustrated) to control the disk 11 and a read/write head 55 to communicate signals with an external device through the PCB connector 61.
The base 70 may constitute a frame, on which the disk pack 10, the HSA 20, and the PCBA 60 are assembled. A ramp 71 where the read/write head 55 is parked when power is cut off may be installed on the base 70. The cover 80 covers the upper surface of the base 70 and protects the disk 11 and the HSA 20.
The HSA 20 may include the read/write head 55 to write data to the disk 11 or to read the recorded data, a slider 50 on which the read/write head 55 is mounted, the suspension 40 to which the slider 50 is coupled, an actuator arm 23 to move across the disk 11 around a pivot shaft 22 as a center to allow the read/write head 55 to access data on the disk 11, the suspension 40 can be coupled to an end portion of the actuator arm 23, a pivot shaft holder 24 to rotatably support the pivot shaft 22 and to support the actuator arm 23 which may be coupled to the pivot shaft holder 24, and a bobbin (not illustrated) provided in the opposite direction of the actuator arm 23 with respect to the pivot shaft holder 24 between a voice coil motor (VCM) and a magnet (not illustrated) and around which a VCM coil (not illustrated) is wound. In the present embodiment, the read/write head 55, the slider 50, and the suspension 40 can constitute a head gimbal assembly (HGA) 30.
The suspension 40 may include a base plate 41, a load beam 43, a step connection portion 45 to connect the base plate 41 and the load beam 43 to be stepped from each other, and a reference connection portion 49 to connect the base plate 41 and the load beam 43. The reference connection portion 49 may be a horizontal connection portion, a non-stepped portion, or a flat plate shape as illustrated in
The read/write head 55 reads or writes information with respect to the disk 11 that is rotating by detecting a magnetic field formed on the surface of the disk 11 or magnetizing the surface of the disk 11. The read/write head 55 consists of a write head to magnetize the disk 11 and a read head to detect the magnetic field of the disk 11 to read and write data by itself.
The voice coil motor (VCM) is a drive motor to pivot the actuator arm 23 to move the read/write head 55 to a desired position on the disk 11 according to the Fleming's left hand rule, that is, a principle that a force is generated when current flows in a conductive body existing in a magnetic field. Accordingly, when current is applied to the VCM coil that is located between magnets, a force is applied to the bobbin so as to pivot the bobbin. Thus, the actuator arm 23 extending from the pivot shaft holder 24 in the opposite direction pivots so that the read/write head 55 supported at an end portion thereof moves across the disk 11 to search a track and access the searched track. The accessed information is signal processed.
As illustrated in
The base plate 41 can be formed of stainless steel to have a rectangular shape and has one end connected to the actuator arm 23 and the other end connected to the load beam 43. A step portion (or a recess portion) 42 can be recessively formed to a predetermined depth in a surface of the base plate 41, to which one side of the step connection portion 45 is coupled. The step portion 42, as illustrated in
That is, first ends of the step connection portion 45 and the horizontal connection portion 49 are disposed on the same plane of the load beam 43, and second ends of the step connection portion 45 and horizontal connection portion 49 are disposed on different planes of the base plate 41 which are spaced-apart by a depth in a vertical direction of a thickness of the base plate 41. The load beam 43 can have the same plane as the base plate 41. However, the load beam 43 may be rotated with respect to the base plate 41 according to a deformation of the step connection portion 45. Widths of the step connection portion 45 and the horizontal connection portion 49 can be the same. Alternatively, the widths of the connection portion 45 and the horizontal connection portion 49 can be different. Similarly, the thicknesses of the step connection portion 45 and the horizontal connection portion 49 can be the same. Moreover they can be different.
Also, the position of the step portion 42 can be appropriately chosen. In the present exemplary embodiment, as illustrated in
The load beam 43 can be manufactured of stainless steel like the base plate 41 and has one end connected to the base plate 41 and the other end to elastically support the slider 50 where the read/write head 55 is mounted. Thus, when the disk 11 rotates, the slider 50 can rise upward from the disk 11 by an air bearing formed between the slider 50 and the surface of the disk 11 and moves across the disk 11.
The step connection portion 45 connects the load beam 43 to the base plate 41 to be stepped from each other, and the horizontal connection portion 49 horizontally connects the load beam 43 and the base plate 41. Accordingly, such a structure minimizes the off-track by driving the load beam 43 asymmetrically to the left and right during the vibration of the disk 11. That is, when the surface of the disk 11 is flat, uniform air bearing is formed. When the surface of the disk 11 is warped due to the vibration of the disk 11, the off-track phenomenon can be minimized, which is generated when the slider 50 supported by the load beam 43 is moved across the surface of the disk 11 and vibrated, as the step connection portion 45 and the horizontal connection portion 49 are deformed different from each other.
The step connection portion 45 may include a plate hinge 46, a load beam hinge 47, and an inclined hinge 48. The plate hinge 46, the load beam hinge 47, and the inclined hinge 48 can be integrally formed of stainless steel and can have a same thickness t1 in the present exemplary embodiment. The plate hinge 46 is coupled to the step portion 42 recessively formed in the base plate 41. Thus, when the cross section of the plate hinge 46 has a rectangular shape corresponding to the shape of the step portion 42, the plate hinge 46 can be closely coupled to the step portion 42. The plate hinge 46 can have the thickness t1 that is less than the recess depth t of the step portion 42. Thus, the thickness t1 of the plate hinge 46 can be determined within a range that is less than the recess depth t of the step portion 42.
The load beam hinge 47 is coupled to a side of the load beam 43. The load beam hinge 47 contacts and is coupled to the side surface of the load beam 43 that faces the surface of the disk 11. The inclined hinge 48 is located between the base plate 41 and the load beam 43 to substantially connect the base plate 41 and the load beam 43 to be stepped. Thus, the inclined hinge 48 can be inclined at a predetermined angle with respect to horizontal surfaces of the base plate 41 and the load beam 43. An inclination angle of the inclined hinge 48 can be appropriately designed to follow an arbitrary track by compensating for the amount of off-track of the read/write head 55 and the disk 11 during the vibration of the disk 11. That is, the angle of the inclined hinge 48 can be determined by anticipating the off-track generated between the read/write head 55 and the disk 11.
The horizontal connection portion 49 horizontally connects the load beam 43 and the other side of the base plate 41 parallel to the connection direction of the step connection portion 45. Both end portions of the horizontal connection portion 49 are coupled to a side surface of the base plate 41 and a side surface of the load beam 43 at a position separated from the step connection portion 45. In the present exemplary embodiment, the horizontal connection portion 49 can have a same thickness t2 as the thickness t1 of the step connection portion 45.
In the present exemplary embodiment, when the horizontal connection portion 49 and the step connection portion 45 connect the load beam 43 and the base plate 41, the surfaces of the base plate 41 and the load beam 43 facing the surface of the disk 11 make substantially the same plane. As the step portion 42 recessively formed from the surface of the base plate 41 is formed and the base plate 41 and the load beam 43 are connected by the step connection portion 45 and the horizontal connection portion 49, the load beam 43 can be driven asymmetrical to the left and right during vibration as illustrated in
In the operation of the HDD 1 configured as above,
When vibrations are generated in the disk 11, the surface of the disk 11 may be warped.
In the present exemplary embodiment, when the surface of the disk 11 is warped, the load beam 43 is driven asymmetrically to the left and right because of structures of the step connection portion 45 and the horizontal connection portion 49, so that the slider 50 is moved in the radial direction of the disk 11. Thus, as indicated by a solid line in
Although it is not illustrated, when the surface of the disk 11 is warped upward, the same phenomenon is generated. In a normal state, that is, when the surface of the disk 11 is flat, the slider 50 is moved vertically while the surface of the slider 50 is maintained horizontal above the surface of the disk 11. When the surface of the disk 11 is warped upward due to the vibration, the slider 50 is moved in the radial direction toward the track by the asymmetric driving to the left and right of the load beam 43. Thus, the read/write head 55 minimizes the off-track phenomenon and follows the track.
As described above, even when the vibration of the disk 11 causes non repeatable run out (NRRO), the off-track phenomenon can be reduced by the structure described above simplifying the assembly and manufacturing of the suspension 40. Also, a position error signal (PES) can be reduced, and further, a higher TPI can be realized.
An HDD according to another embodiment of the present general inventive concept will be described with reference to the accompanying drawings. In the following description, only portions different from the previous exemplary embodiment will be described and descriptions of the same portions will be omitted for brevity of the detailed description.
The first base plate 41a can have a predetermined thickness and can make an upper plate of the base plate 41a. A cut-off portion 42a can be formed at a side of the second base plate 41c by cutting a part of the second base plate 41c by a predetermined thickness and width. Thus, a step portion (not illustrated) is provided by the cut-off portion 42a when the first and second base plates 41b and 41c are combined to each other.
According to the present general inventive concept, the combination of the first and second base plates 41b and 41c can be made by various methods, for example, the first and second base plates 41b and 41c can be combined by welding. Since the first and second base plates 41b and 41c can be mainly formed of stainless steel, the first and second base plates 41b and 41c can be welded by electric spot welding.
In the above-described embodiments, a slider is coupled to a load beam, but the present general inventive concept is not limited thereto and it may be possible that a flexure is coupled to the load beam and the slider is coupled to the flexure. Also, although in the above-described embodiments the reference connection portion is the horizontal connection portion, the present general inventive concept is not limited thereto, and the reference connection portion may be a stepped reference connection portion that has a step different from the step connection portion so that the stepped reference connection portion can minimize the off-track phenomenon generated during vibration by driving the load beam asymmetrically to the left and right when the disk surface is warped.
According to the above-described embodiments of the present general inventive concept, an off-track phenomenon generated between a read/write head and a disk by a vibration of the disk can be remarkably reduced. Also, a track following ability of the read/write head can be improved and a structure of a suspension can be simplified so that a manufacturing and assembly are made easy. Thus, a PES by a NRRO can be reduced so that a TMR budget of a high capacity HDD can be achieved.
Although a few embodiments of the present general inventive concept have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the general inventive concept, the scope of which is defined by in the appended claims and their equivalents.
Number | Date | Country | Kind |
---|---|---|---|
2006-71629 | Jul 2006 | KR | national |