JP2010113769A - Head slider and storage device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a head slider capable of increasing the freedom of designing an actuator, and to provide a storage device. <P>SOLUTION: When a projection is formed on the second air bearing surface 52b of a second rail 49b based on an actuator 55, air pressure rises between the second air bearing surface 52b and a storage medium 14. A buoyant force increases on the second rail 49b according to the rise of the air pressure. A distance increases between the second rail 49b and the storage medium 14. A first rail 49a and the second rail 49b are arranged on opposite sides sandwiching a back-and-forth center line 56, and hence a head slider 22 rotates around a roll angle. A distance between the first rail 49a and the storage medium 14 is reduced. Thus, the floating amount of a head element 44 is easily adjusted. The actuator 55 is disposed away from the head element 44 in a slider width direction. The freedom of designing the actuator 55, i.e., a size, a shape or a type, is greatly increased. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a head slider incorporated in a storage device such as a hard disk drive (HDD).

  An actuator, that is, a heater is incorporated in the head slider adjacent to the electromagnetic transducer. When performing the zero calibration, a protrusion is formed on the medium facing surface of the head slider based on the heat generated by the heater. The flying height of the electromagnetic transducer is adjusted from the surface of the magnetic disk based on the adjustment of the protrusion amount. Based on such protrusion, the electromagnetic conversion element approaches the surface of the magnetic disk. As a result, the recording density of magnetic information is improved.

  As described above, the heater is disposed adjacent to the electromagnetic conversion element. As a result, the electromagnetic conversion element is heated based on the heat generated by the heater. Excessive heating damages the electromagnetic transducer. At the same time, the electromagnetic conversion element is deformed based on the heat generated by the heater. Excessive deformation damages the electromagnetic transducer. As a result, the amount of heat generated by the heater is limited. The degree of freedom in designing the heater is greatly limited. Efficient protrusion formation is impeded.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a head slider and a storage device that can greatly increase the degree of freedom in designing an actuator.

  In order to achieve the above object, the head slider includes a slider body that defines a medium facing surface, a first rail that is formed on the medium facing surface and defines a first air bearing surface at the top surface, and the first slider. A head element incorporated in the first air bearing surface of the rail; a second air bearing surface defined on the top surface formed on the medium facing surface; and a slider width direction center position of the air inflow end of the slider body and the slider A second rail disposed opposite to each other across a center line in the front-rear direction connecting the center position in the slider width direction of the air outflow end of the main body, and incorporated in the second air bearing surface of the second rail, And an actuator that forms a protrusion on the two-bearing surface.

  Such a head slider floats from the surface of the storage medium. At this time, when a protrusion is formed on the second air bearing surface of the second rail based on the actuator, the atmospheric pressure increases between the second air bearing surface and the storage medium. The buoyancy increases at the second rail as the atmospheric pressure increases. Since the atmospheric pressure greatly increases when the protrusion is formed, buoyancy is easily generated on the second rail. The distance increases between the second rail and the storage medium. On the other hand, no protrusion is formed on the first rail. The rise in atmospheric pressure is suppressed to a low level when no protrusion is formed compared to when the protrusion is formed. As a result, the distance between the first rail and the storage medium is simply reduced. Since the first rail and the second rail are disposed on opposite sides of the center line in the front-rear direction, the head slider rotates around the roll angle. The flying height of the head slider, that is, the head element is easily adjusted.

  Moreover, the actuator is disposed away from the head element in the slider width direction. In the second rail, it is not necessary to consider the influence of heat generation or deformation on the head element from the actuator. As a result, the actuator design, that is, the degree of freedom in dimensions, shape, and type is significantly improved. The actuator can be designed with larger dimensions than ever, for example. Thus, the amount of heat generated by the actuator increases. Protrusion can be performed more efficiently than before. On the other hand, when the head element and the actuator are incorporated adjacent to each other, for example, in the first rail, the size, shape, and type of the actuator are restricted based on the influence of heat generation and deformation on the head element.

  As described above, the head slider and the storage device can greatly increase the degree of freedom in actuator design.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 schematically shows an internal structure of a hard disk drive (HDD) 11 as a specific example of a storage device according to the present invention. The HDD 11 includes a housing, that is, a housing 12. The housing 12 includes a box-shaped base 13 and a cover (not shown). The base 13 defines, for example, a flat rectangular parallelepiped internal space, that is, an accommodation space. The base 13 may be formed from a metal material such as Al (aluminum) based on casting. The cover is coupled to the opening of the base 13. The accommodation space is sealed between the cover and the base 13. The cover may be formed from a single plate material based on press working, for example.

  In the accommodation space, one or more magnetic disks 14 as storage media are accommodated. The magnetic disk 14 is mounted on the rotation shaft of the spindle motor 15. The spindle motor 15 can rotate the magnetic disk 14 at a high speed such as 5400 rpm, 7200 rpm, 10000 rpm, and 15000 rpm. Here, for example, the magnetic disk 14 is configured as a perpendicular magnetic recording disk. That is, in the recording magnetic film on the magnetic disk 14, the easy axis of magnetization is set in the vertical direction perpendicular to the surface of the magnetic disk 14.

  A carriage 16 is further accommodated in the accommodation space. The carriage 16 includes a carriage block 17. The carriage block 17 is rotatably connected to a support shaft 18 extending in the vertical direction. A plurality of carriage arms 19 extending in the horizontal direction from the support shaft 18 are defined in the carriage block 17. The carriage block 17 may be molded from Al (aluminum) based on extrusion molding, for example.

  A head suspension 21 is attached to the tip of each carriage arm 19. The head suspension 21 extends forward from the tip of the carriage arm 19. A flexure, which will be described later, is attached to the tip of the head suspension 21. A so-called gimbal spring is defined in the flexure. With the action of the gimbal spring, the flying head slider 22 can change its posture with respect to the head suspension 21. As will be described later, a head element, that is, an electromagnetic conversion element is mounted on the flying head slider 22.

  When an air flow is generated on the surface of the magnetic disk 14 based on the rotation of the magnetic disk 14, positive pressure, that is, buoyancy and negative pressure act on the flying head slider 22 by the action of the air flow. Since the buoyancy and negative pressure balance with the pressing force of the head suspension 21, the flying head slider 22 can continue to fly with relatively high rigidity during the rotation of the magnetic disk.

  When the carriage 16 rotates about the support shaft 18 while the flying head slider 22 floats, the flying head slider 22 can move along the radial line of the magnetic disk 14. As a result, the electromagnetic transducer on the flying head slider 22 can cross the data zone between the innermost recording track and the outermost recording track. Thus, the electromagnetic transducer on the flying head slider 22 is positioned on the target recording track.

  For example, a power source such as a voice coil motor (VCM) 23 is connected to the carriage block 17. The carriage block 17 can rotate around the support shaft 18 by the action of the VCM 23. Based on the rotation of the carriage block 17, the swing of the carriage arm 19 and the head suspension 21 is realized.

  As is clear from FIG. 1, the flexible printed circuit board unit 25 is disposed on the carriage block 17. The flexible printed circuit board unit 25 includes a head IC (integrated circuit) 27 mounted on the flexible printed circuit board 26. The head IC 27 is connected to a read element and a write element of an electromagnetic conversion element. A flexure 28 is used for connection. The flexure 28 is connected to the flexible printed circuit board unit 25. At the time of reading magnetic information, that is, binary information, a sense current is supplied from the head IC 27 toward the reading element of the electromagnetic transducer. Similarly, at the time of writing binary information, a write current is supplied from the head IC 27 toward the write element of the electromagnetic conversion element. The current value of the sense current is set to a specific value. A current is supplied to the head IC 27 from a small circuit board 29 arranged in the accommodation space or a printed circuit board (not shown) attached to the back side of the bottom plate of the base 13.

  As shown in FIG. 2, the head suspension 21 includes a base plate 31 that is attached to the front end of the carriage arm 19 and a load beam 32 that is spaced forward from the base plate 31 at a predetermined interval. A hinge plate 33 is fixed to the surfaces of the base plate 31 and the load beam 32. The hinge plate 33 defines an elastic deformation portion 34 between the front end of the base plate 31 and the rear end of the load beam 32. Thus, the hinge plate 33 connects the base plate 31 and the load beam 32. The base plate 31, the load beam 32, and the hinge plate 33 are each formed from, for example, a stainless steel thin plate.

  The aforementioned flexure 28 is attached to the surface of the head suspension 21. The flexure 28 includes a stainless steel plate 35. The stainless steel plate 35 includes a support plate 36 that receives the back surface of the flying head slider 22 on the surface, and a fixed plate 37 that is partially joined to the surfaces of the load beam 32 and the hinge plate 33. For joining the fixing plate 37, for example, spot welding may be performed at a plurality of joining spots. The support plate 36 and the fixed plate 37 are formed from a single stainless steel thin plate. The flying head slider 22 is bonded to the surface of the support plate 36. A wiring pattern 38 is formed on the surface of the fixed plate 37. One end of the wiring pattern 38 is connected to the flying head slider 22.

  As shown in FIG. 3, behind the flying head slider 22, the support plate 36 is received by a dome-shaped protrusion 39 formed on the surface of the load beam 32. The aforementioned elastic deformation portion 34 exhibits a predetermined elastic force, that is, a bending force. Due to this bending force, a pressing force toward the surface of the magnetic disk 14 is applied to the front end of the load beam 32. This pressing force acts on the flying head slider 22 from behind the support plate 36 by the action of the protrusion 39. The flying head slider 22 can change its posture based on buoyancy generated by the action of airflow. The protrusion 39 allows a change in the posture of the flying head slider 22, that is, the support plate 36.

FIG. 4 shows the flying head slider 22 according to the first embodiment of the present invention. The flying head slider 22 includes a slider body 41 formed in a flat rectangular parallelepiped, for example. The slider body 41 includes a base 42 formed in a flat rectangular parallelepiped, and an insulating nonmagnetic film, that is, an element built-in film 43 laminated on the air outflow end face of the base 42. The electromagnetic conversion element 44 described above is incorporated in the element built-in film 43. Substrate 42 may be made of a hard material such as _Al 2 _O 3 -TiC (AlTiC). The element built-in film 43 may be formed of a relatively soft insulating nonmagnetic material such as Al ₂ O ₃ (alumina).

  The flying head slider 22 faces the magnetic disk 14 at the medium facing surface, that is, the flying surface 45. A flat base surface 46, that is, a reference surface is defined on the air bearing surface 45. When the magnetic disk 14 rotates, an airflow 47 acts on the air bearing surface 45 from the front end to the rear end of the slider body 41.

  A single front rail 48 that rises from the base surface 46 is formed on the air bearing surface 45 on the upstream side of the airflow 47, that is, on the air inflow side. The front rail 48 extends in the slider width direction along the air inflow end of the base surface 46. Similarly, the air bearing surface 45 is formed with a pair of left and right rear side rails 49a and 49b that rise from the base surface 46 on the downstream side of the airflow, that is, on the air outflow side. The rear side rails 49 a and 49 b extend from the base material 42 to the element built-in film 43. Thus, the rear side rails 49 a and 49 b are formed along the air outflow side end surface of the slider body 41. The rear side rails 49 a and 49 b are respectively disposed along the left and right edges of the base surface 46. As a result, the rear side rails 49a and 49b are arranged with an interval in the slider width direction.

  So-called air bearing surfaces (ABS) 51, 52a, 52b are defined on the top surfaces of the front rail 48 and the rear side rails 49a, 49b. For example, the air inflow ends of the air bearing surfaces 51, 52a, 52b are connected to the top surfaces of the rails 48, 49a, 49b by steps. The airflow 47 generated based on the rotation of the magnetic disk 14 is received by the air bearing surface 45. At this time, a relatively large positive pressure, that is, buoyancy is generated on the air bearing surfaces 51, 52a, 52b by the action of the step. In addition, a large negative pressure is generated behind, that is, behind, the front rail 48. The flying posture of the flying head slider 22 is established based on the balance between these buoyancy and negative pressure. The form of the flying head slider 22 is not limited to this form.

  The electromagnetic conversion element 44 is embedded in the rear side rail 49a on the air outflow side of the air bearing surface 52a. The electromagnetic conversion element 44 includes, for example, a reading element and a writing element. As the read element, for example, a tunnel junction magnetoresistive effect (TuMR) element is used. In the TuMR element, the resistance change of the tunnel junction film is caused according to the direction of the magnetic field acting from the magnetic disk 14. Based on such resistance change, binary information is read from the magnetic disk 14. A magnetic recording head such as a so-called single pole head is used as the writing element. The single pole head generates a recording magnetic field by the action of a thin film coil pattern. Binary information is written on the magnetic disk 14 by the action of the recording magnetic field. The electromagnetic conversion element 44 exposes the reading gap of the reading element and the writing gap of the writing element on the surface of the element built-in film 43. For example, a giant magnetoresistive (GMR) element may be used as the read element.

  A hard protective film may be formed on the surface of the element built-in film 43 on the air outflow side of the air bearing surface 52a. Such a hard protective film covers the read gap and the write gap exposed on the surface of the element built-in film 43. For example, a DLC (diamond-like carbon) film may be used as the protective film.

  Referring also to FIG. 5, an actuator 55 is incorporated in the rear side rail 49b on the air outflow side of the air bearing surface 52b. Here, the actuator 55 is formed of a heating element. A heat generating body is formed from a heating wire, for example. When electric power is supplied to the actuator 55, the actuator 55 generates heat. The element built-in film 43 is thermally expanded together with the actuator 55 by the heat of the actuator 55. As a result, as shown in FIG. 6, the base material 42 and the element built-in film 43 are raised on the air bearing surface 52b. A protrusion is thus formed. The protrusion is displaced toward the magnetic disk 14. The amount of protrusion is specified based on the amount of power.

  As shown in FIG. 7, the rear side rails 49 a and 49 b have a front-rear direction center line 56 connecting the slider width direction center position of the air inflow end of the slider body 41 and the slider width direction center position of the air outflow end of the slider body 41. They are arranged on opposite sides of each other. Thus, the electromagnetic conversion element 44 and the actuator 55 are arranged on the opposite sides with respect to the center line 56 in the front-rear direction. The protrusion 39 described above supports the support plate 36 in a virtual plane that includes the front-rear direction center line 56 and is orthogonal to the base surface 46. As described above, the electromagnetic conversion element 44 and the actuator 55 are disposed adjacent to the air outflow end of the slider body 41.

  As shown in FIG. 8, a preamplifier circuit 61, a current supply circuit 62, and a power supply circuit 63 are incorporated in the head IC 27. The preamplifier circuit 61 is connected to the reading element 64 of the electromagnetic conversion element 44. A sense current is supplied from the preamplifier circuit 61 toward the read element 64. The current value of the sense current is maintained at a constant value. The current supply circuit 62 is connected to the writing element 65 of the electromagnetic conversion element 44. A write current is supplied from the current supply circuit 62 to the write element 65. A magnetic field is generated by the write element 65 based on the supplied write current. The power supply circuit 63 is connected to the actuator 55. The power supply circuit 63 supplies predetermined power to the actuator 55. The actuator 55 generates heat in response to the supply of electric power. The temperature of the actuator 55 is determined by the amount of electric power.

  A control circuit (hard disk controller) 66 is connected to the head IC 27. The control circuit 66 instructs the head IC 27 to supply a sense current, a write current, and power. At the same time, the control circuit 66 detects the voltage of the sense current. Prior to detection, the preamplifier circuit 61 amplifies the voltage of the sense current. The control circuit 66 determines binary information based on the output of the preamplifier circuit 61. The control circuit 66 controls the operations of the preamplifier circuit 61, the current supply circuit 62, and the power supply circuit 63 according to a predetermined software program. The software program may be stored in the memory 67, for example. The flying height of an electromagnetic conversion element 44 described later is adjusted based on such a software program. Data necessary for adjustment may be stored in the memory 67 in the same manner. Software programs and data may be transferred to the memory 67 from other storage media. The control circuit 66 and the memory 67 are mounted on the circuit board 29, for example.

  In the HDD 11, the protrusion amount is set prior to reading or writing of binary information. Zero calibration is performed when setting the protrusion amount. In the zero calibration, the protrusion amount of the protrusion is measured when the rear side rail 49a contacts the surface of the magnetic disk 14. Based on the amount of protrusion at the time of contact, the amount of protrusion at the time of reading or writing is set. Thus, when the protrusion amount is set at the time of reading or writing, the electromagnetic conversion element can float from the surface of the magnetic disk 14 with a predetermined flying height. Such zero calibration may be performed every time the HDD 11 is activated, for example.

  In performing the zero calibration, the control circuit 66 executes a predetermined software program. When the software program is executed, the control circuit 66 commands the spindle motor 15 to drive. The magnetic disk 14 rotates at a predetermined rotation speed. At the same time, the control circuit 66 commands the VCM 23 to drive. The carriage 16 swings around the support shaft 18. As a result, the flying head slider 22 faces the surface of the magnetic disk 14. The flying head slider 22, that is, the electromagnetic conversion element 44 floats from the magnetic disk 14 with a predetermined flying height H. In addition, the control circuit 66 supplies a current to the head IC 27. The control circuit 66 monitors the output of the preamplifier circuit 61. That is, the control circuit 66 observes the voltage value of the sense current. At this time, the power supply circuit 63 suspends the supply of power.

  The control circuit 66 supplies a command signal to the power supply circuit 63. The control circuit 66 increases the protrusion amount of the protrusion by a specified increase amount. In response to the reception of the command signal, the power supply circuit 63 supplies the actuator 55 with power of an amount corresponding to the increased protrusion amount. The amount of power may be set in advance based on the linear expansion coefficient of the actuator 55, for example. As shown in FIG. 9, the amount of protrusion increases. The air bearing surface 52b is raised. The distance between the rear side rail 49b and the magnetic disk 14 decreases. The air pressure increases between the rear side rail 49b and the magnetic disk 14 based on the decrease in the distance. The buoyancy acting on the rear side rail 49b increases. As a result, the distance between the air bearing surface 52b and the magnetic disk 14 increases as shown in FIG.

  As described above, the flying head slider 22 is supported on the protrusion 39 via the support plate 36 on the back surface. The rear side rails 49a and 49b are arranged on the opposite sides of the center line 56 in the front-rear direction. As a result, the flying head slider 22 rotates around the roll angle defined in the slider width direction with the protrusion 39 as a fulcrum. Thus, the distance between the rear side rail 49a and the magnetic disk 14 is reduced. The electromagnetic conversion element 44 approaches the magnetic disk 14. At this time, the control circuit 66 determines “contact” between the rear side rail 49 a and the magnetic disk 14. In the determination, the control circuit 66 observes the presence or absence of the aforementioned “swing” that appears in the voltage value of the sense current. Thus, the control circuit 66 increases the protrusion amount of the protrusion by a predetermined increase amount until the “sway” is observed. As a result, the rear side rail 49 a comes into contact with the magnetic disk 14. “Shake” is observed. The control circuit 66 determines contact between the rear side rail 49 a and the magnetic disk 14. The control circuit 66 specifies the amount of protrusion at the time of contact. The specified protrusion amount is stored in the memory 67, for example. This completes the zero calibration.

  Here, the inventor verified the distribution of atmospheric pressure between the flying head slider and the magnetic disk when the protrusion was formed and when the protrusion was not formed based on the simulation. A conventional flying head slider was used for the verification. On the air outflow side of the flying head slider, one rear center rail was formed instead of the pair of rear side rails 49a and 49b. The rear center rail was arranged at the center position in the slider width direction. The actuator described above was incorporated in the rear center rail. The height H of the rear center rail from the surface of the magnetic disk was set equal when the protrusion was formed and when the protrusion was not formed. At this time, the atmospheric pressure was measured at each position along the longitudinal center line. As a result, as shown in FIG. 11, a larger atmospheric pressure was measured when the protrusion was formed than when the protrusion was not formed. This difference in air pressure is considered to be caused by the fact that the air bearing surface of the rear center rail curves toward the magnetic disk based on the formation of the protrusion.

  In the HDD 11 as described above, when a protrusion is formed on the air bearing surface 52b of the rear side rail 49b, the air pressure increases between the air bearing surface 52b and the magnetic disk 14. The buoyancy increases at the rear side rail 49b as the atmospheric pressure increases. Since the atmospheric pressure greatly increases when the protrusion is formed, the buoyancy is easily increased in the rear side rail 49b. The distance between the rear side rail 49b and the magnetic disk 14 increases. On the other hand, no protrusion is formed on the side rear rail 49a. As described above, the increase in the atmospheric pressure is suppressed to be lower when the protrusion is not formed than when the protrusion is formed. As a result, the distance between the side rear rail 49a and the magnetic disk 14 is simply reduced. Thus, the flying head slider 22 rotates about the roll angle β. The flying height of the flying head slider 22, that is, the electromagnetic transducer 44 is easily adjusted.

  Moreover, the actuator 55 is disposed away from the electromagnetic transducer 44 in the slider width direction. In the rear side rail 49b, it is not necessary to consider the effects of heat generation and deformation from the actuator 55 to the electromagnetic conversion element 44. As a result, the degree of freedom of the size, shape, and type of the actuator 55 is remarkably improved. The actuator 55 can be designed with larger dimensions than ever, for example. Thus, the amount of heat generated by the actuator 55 increases. Protrusion can be performed more efficiently than before. On the other hand, when the electromagnetic conversion element 44 and the actuator 55 are incorporated, for example, adjacent to the rear side rail 49a, the size, shape, and type of the actuator 55 are limited based on the influence of heat generation and deformation on the electromagnetic conversion element 44. Will be.

  In addition, the electromagnetic conversion element 44 and the actuator 55 are arranged on the opposite sides in the slider width direction across the center line 56 in the front-rear direction. As a result, the flying head slider 22 changes its posture based on a change in roll angle defined in the slider width direction. Rotation is achieved with a relatively small moment of inertia. On the other hand, when the electromagnetic conversion element 44 and the actuator 55 are disposed adjacent to each other in the front-rear direction along, for example, the front-rear direction center line 56, the flying head slider 22 has a pitch angle defined in the front-rear direction of the slider body 41. Change posture based on change. In general, the slider body 41 is largely defined in the front-rear direction compared to the slider width direction. A relatively large moment of inertia is required for posture change. Therefore, when the same power is supplied, the flying height H is efficiently adjusted in the flying head slider 22 of the present invention.

  FIG. 12 shows a flying head slider 22a according to a second embodiment of the present invention. In the flying head slider 22a, a piezoelectric element is used for the actuator 55 described above. Here, the actuator 55 is disposed, for example, in a recess 71 formed on the air outflow side end surface of the slider body 41. Here, the actuator 55 extends long in the thickness direction of the slider body 41. Both ends of the actuator 55 are received by the inner wall surface of the recess 71. As shown in FIG. 13, the actuator 55 can be deformed or extended in a vertical direction perpendicular to the air bearing surface 45 based on application of a voltage. As a result, a protrusion is formed on the air bearing surface 52b in the rear center rail 49b. Like reference numerals are attached to the structure or components equivalent to those of the aforementioned flying head slider 22. According to such a flying head slider 22a, the same effect as described above is realized.

  In the flying head sliders 22 and 22 a as described above, the rear side rails 49 a and 49 b do not necessarily have to be arranged along the left and right edges of the base surface 46. For example, at least one of the rear side rails 49 a and 49 b may be disposed on the inner side from the left and right edges of the base surface 46. Further, as long as the electromagnetic conversion element 44 and the actuator 55 are arranged on opposite sides of the center line 56 in the front-rear direction, the rear side rails 49a and 49b may be integrated with each other. Furthermore, the actuator 55 may be incorporated in the rear side rail 49a while the electromagnetic conversion element 44 is incorporated in the rear side rail 49b.

1 is a plan view schematically showing an internal structure of a specific example of a storage device according to the present invention, that is, a hard disk drive (HDD). It is a partial enlarged plan view which shows the structure of a carriage roughly. FIG. 5 is a partially enlarged cross-sectional view taken along line 5-5 in FIG. 1 is an enlarged perspective view schematically showing a structure of a flying head slider according to a first embodiment of the present invention. FIG. 5 is a partially enlarged cross-sectional view taken along line 5-5 in FIG. 3 and schematically shows a state when no protrusion is formed. Corresponding to FIG. 5, the appearance during the formation of the protrusion is schematically shown. It is a top view which shows roughly the structure of the flying head slider which concerns on 1st Embodiment of this invention. It is a block diagram which shows the control system of HDD. It is a side view which shows roughly the mode of the flying head slider which is floating from the surface of a magnetic disk. It is a side view which shows roughly the mode of the flying head slider which rotates around a roll angle. It is a graph which shows the atmospheric | air pressure between the magnetic disk at the time of formation of a protrusion, and a non-formation and a flying head slider. It is an expansion perspective view which shows roughly the structure of the flying head slider which concerns on 2nd Embodiment of this invention. It is a side view which shows roughly the structure of the flying head slider which concerns on 2nd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 Storage device (hard disk drive), 14 Storage medium (magnetic disk), 21 Head suspension, 22, 22a Head slider (flying head slider), 39 Protrusion, 41 Slider body, 44 Head element (electromagnetic conversion element), 45 Medium Opposing surface, 49a First rail (rear side rail), 49b Second rail (rear side rail), 52a First air bearing surface, 52b Second air bearing surface, 55 Actuator, 56 Center line in the front-rear direction.

Claims (4)

A slider body defining a medium facing surface;
A first rail formed on the medium facing surface and defining a first air bearing surface at a top surface;
A head element incorporated in the first air bearing surface of the first rail;
Before and after connecting the center position in the slider width direction of the air inflow end of the slider body and the center position in the slider width direction of the air outflow end of the slider body. A second rail disposed opposite to each other across the direction center line;
A head slider comprising: an actuator incorporated in a second air bearing surface of the second rail to form a protrusion on the second bearing surface.   2. The head slider according to claim 1, wherein the actuator is a heating element that generates heat based on supply of electric power.   2. The head slider according to claim 1, wherein the actuator is a piezoelectric element that deforms based on application of a voltage. A storage medium;
A head slider that faces the storage medium on a medium facing surface;
A head suspension that supports the head slider at the tip;
A dome-shaped protrusion formed on the head suspension and supporting the head slider on the back surface of the head slider defined on the back side of the medium facing surface;
The head slider includes a slider main body that defines the medium facing surface, a first rail that is formed on the medium facing surface of the slider main body and defines a first air bearing surface at the top surface, and a first rail of the first rail. 1 opposite to each other across a front-rear direction center line connecting a head element incorporated in an air bearing surface and a slider width direction center position of the air inflow end of the slider body and a slider width direction center position of the air outflow end of the slider body A storage device comprising: a second rail arranged on a side; and an actuator incorporated in a second air bearing surface of the second rail to form a protrusion on the second bearing surface.

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