US20040095687A1 - Precise positioning actuator for head element, head gimbal assembly with the actuator, disk drive apparatus with the head gimbal assembly and manufacturing method of head gimbal assembly - Google Patents
Precise positioning actuator for head element, head gimbal assembly with the actuator, disk drive apparatus with the head gimbal assembly and manufacturing method of head gimbal assembly Download PDFInfo
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- US20040095687A1 US20040095687A1 US10/705,884 US70588403A US2004095687A1 US 20040095687 A1 US20040095687 A1 US 20040095687A1 US 70588403 A US70588403 A US 70588403A US 2004095687 A1 US2004095687 A1 US 2004095687A1
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- United States
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- actuator
- head
- movable arms
- gimbal assembly
- slider
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/54—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head into or out of its operative position or across tracks
- G11B5/55—Track change, selection or acquisition by displacement of the head
- G11B5/5521—Track change, selection or acquisition by displacement of the head across disk tracks
- G11B5/5552—Track change, selection or acquisition by displacement of the head across disk tracks using fine positioning means for track acquisition separate from the coarse (e.g. track changing) positioning means
Definitions
- the present invention relates to a precise positioning actuator for a head element such as a thin-film magnetic head element or an optical head element, to a head gimbal assembly (HGA), with the actuator, to a disk drive apparatus with the HGA and to a manufacturing method of an HGA.
- a head element such as a thin-film magnetic head element or an optical head element
- HGA head gimbal assembly
- thin-film magnetic head elements for writing magnetic information into and/or reading magnetic information from magnetic disks are in general formed on magnetic head sliders flying in operation above the rotating magnetic disks.
- the sliders are supported at top end sections of suspensions of HGAs, respectively.
- an additional actuator mechanism is mounted at a position nearer to the magnetic head slider than the VCM so as to perform fine precise positioning that cannot be realized by the VCM only.
- the techniques for realizing precise positioning of the magnetic head are described in for example U.S. Pat. No. 5,745,319 and Japanese patent publication No. 08180623 A.
- This piggy-back structure actuator is formed by piezoelectric material of PZT in an I-character shape with one end section to be fixed to a suspension, the other end section to be fixed to a magnetic head slider and a pillar shaped movable arm connected between these end sections.
- stepwise stacked are the actuator and the magnetic head slider, namely, the actuator is caught between the suspension and the slider to form a stacked cantilever structure.
- the actuator as a whole consists of piezoelectric material such as PZT of a brittle material, and the actuator and the magnetic head slider are stacked to form a cantilever structure. A shock easily occurs with a moment and also shock resistance is very poor;
- Another object of the present invention is to provide a precise positioning actuator for a head element, an HGA with the actuator, a disk drive apparatus with the HGA and a manufacturing method of an HGA, whereby a shock resistance can be greatly improved.
- Further object of the present invention is to provide a precise positioning actuator for a head element, an HGA with the actuator, a disk drive apparatus with the HGA and a manufacturing method of an HGA, whereby the productivity and also quality of the HGA can be greatly improved.
- a precise positioning actuator to be fixed with a head slider with at least one head element and with a support, for precisely positioning the at least one head element includes a pair of movable arms capable of displacing in response to a drive signal applied to the actuator The head slider is caught in a space between the movable arms.
- the head slider Since the head slider is caught in a space between the movable arms capable of displacing in response to a drive signal applied thereto, the thickness of an HGA around the head slider does not increase even if the actuator is attached. Thus, no modifications in size of a disk drive apparatus due to the mounting of the actuator is necessary. Also, since the actuator and the head slider are not stacked to form a cantilever structure, a shock resistance can be greatly improved. Furthermore, since the head slider is caught in between the movable arms, the top end sections of the movable arms, which actually transfer the displacement to the head slider, can be always positioned at the top end of the head slider. Thus, it is possible to provide a constant travel to the head slider even if its size changes, and therefore an enough stroke of the head element at the precise positioning operation can be always obtained.
- the actuator further includes a base fixed to the support and that the movable arms extend from the base.
- the movable arms have at their top end sections slider fixing sections to be fixed to side surfaces of the head slider, respectively.
- the actuator has a shape so that there exists air gaps between the movable arms and side surfaces of the head slider except for the slider fixing sections, respectively.
- the base is made of an elastic sintered ceramic.
- each of the movable arms includes an arm member made of an elastic sintered ceramic, and a piezoelectric element formed on a side surface of the arm member. Since the main sections of the actuator are made of elastic sintered ceramic such as ZrO 2 that is strong for bending, a shock resistance of the actuator itself increases.
- the movable arms is constituted so that the head slider is linearly and laterally oscillated in response to the drive signal. Since the head slider displaces namely oscillates with linear motion not swinging or rotational motion, more precise positioning of the head element can be expected.
- inner corners at coupling sections of the base and the movable arms have an obtuse angle plane shape or a smooth plane shape.
- the shock resistance of the actuator itself is extremely improved.
- the actuator has a rough U-plane shape.
- the actuator has a thickness equal to or less than a thickness of a head slider to be caught.
- a spacing between the pair of movable arms is determined to a value slightly shorter than a width of the head slider to be caught.
- the at least one head element is at least one thin-film magnetic head element.
- an HGA includes a head slider with at least one head element, a support and the aforementioned precise positioning actuator fixed with the head slider and with the support for precisely positioning the at least one head element.
- the movable arms of the actuator and the head slider are fixed with an adhesive.
- the actuator and the support are fixed with an adhesive or a solder.
- a disk drive apparatus having at least one HGA mentioned above.
- a manufacturing method of an HGA includes a step of preparing a precise positioning actuator with a pair of movable arms capable of displacing in response to a drive signal applied thereto, a step of catching a head slider with at least one head element in a space between the movable arms of the actuator, and a step of fixing the actuator with the caught head slider to the support.
- the head slider is caught in a space between the movable arms of the actuator, and then the actuator with the caught head slider is fixed to the support. Since assembling of the head slider and the actuator can be carried out on the flat plate, alignment of the slider and the actuator becomes easy resulting that a higher accuracy assembling can be expected. Also, since a thermosetting adhesive with excellent curing performance although it needs a long curing time can be used, a high quality assembly of the head slider and the actuator can be obtained. Furthermore, since the assembly has a simple shape, adhesion and electrical connection of the assembly with a suspension can be performed by using a general HGA assembling equipment resulting the productivity to extremely improve and thus the manufacturing cost to reduce.
- the catching step includes fixing the head slider between the movable arms with an adhesive.
- a spacing between the pair of movable arms is slightly shorter than a width of the head slider to be caught, and that the catching step includes provisionally fixing the head slider between the movable arms by a pinching force of the movable arms.
- the provisional fixing can be attained without using any holder.
- the catching step includes securely fixing the head slider to the movable arms by thermally curing the adhesive after the provisional fixing.
- the fixing step includes fixing the actuator to the support with an adhesive or a solder
- FIG. 1 is an oblique view schematically illustrating main components of a magnetic disk drive apparatus in a preferred embodiment according to the present invention
- FIG. 2 is an oblique view illustrating the whole structure of an HGA in the embodiment of FIG. 1;
- FIG. 3 is an oblique view illustrating a top end section of the HGA in the embodiment of FIG. 1;
- FIG. 4 is an oblique view illustrating the top end section of the HGA in the embodiment of FIG. 1, seen from different direction from that of FIG. 3;
- FIG. 5 is a plane view illustrating a structure of an actuator in the embodiment of FIG. 1;
- FIG. 6 is a sectional view illustrating a structure of a piezoelectric element section of the actuator shown in FIG. 5;
- FIG. 7 is an oblique view illustrating an operation of the actuator shown in FIG. 5;
- FIG. 8 is an oblique view illustrating a part of a manufacturing process of the HGA in the embodiment of FIG. 1;
- FIG. 9 is an oblique view illustrating a part of a manufacturing process of the HGA in the embodiment of FIG. 1;
- FIGS. 10 a and 10 b are oblique views illustrating a part of a manufacturing process of the HGA in the embodiment of FIG. 1;
- FIG. 11 is an oblique view schematically illustrating a structure of an actuator in another embodiment according to the present invention.
- FIG. 12 is an oblique view schematically illustrating a structure of an actuator in a further embodiment according to the present invention.
- FIG. 13 is an oblique view schematically illustrating a structure of an actuator in a still further embodiment according to the present invention.
- FIG. 1 illustrates main components of a magnetic disk unit of a preferred embodiment according to the present invention
- FIG. 2 illustrates the whole structure of an HGA in this embodiment
- FIGS. 3 and 4 illustrate a top end section of the HGA in this embodiment, seen from different directions with each other.
- reference numeral 10 denotes a plurality of magnetic hard disks rotating around an axis 11
- 12 denotes an assembly carriage device for positioning each magnetic head element on a track of each disk.
- the assembly carriage device 12 is mainly constituted by a carriage 14 capable of rotating around an axis 13 and a main actuator 15 such as for example a voice coil motor (VCM) for driving the carriage 14 to rotate.
- VCM voice coil motor
- Base sections at one ends of a plurality of drive arms 16 stacked along the axis 13 are attached to the carriage 14 , and one or two HGAs 17 are mounted on a top section at the other end of each arm 16 .
- Each of the HGAs 17 has a slider mounted at its top end section so that the slider opposes to one surface (recording and reproducing surface) of each of the magnetic disks 10 .
- the HGA is assembled by fixing a fine tracking actuator 22 for precise positioning of a thin-film magnetic head element to a top end section of a suspension 20 .
- the actuator 22 holds side surfaces of a magnetic head slider 21 with the thin-film magnetic head element so that the slider 21 is caught in a space between its movable arms.
- a main or course actuator of VCM 15 shown in FIG. 1 is used for rotationally moving the drive arm 16 to which such HGA is attached, so as to move the whole assembly.
- the actuator 22 contributes the fine positioning of the HGA, which cannot be adjusted by the main or course actuator 15 .
- the suspension 20 is substantially formed, as shown in FIGS. 2 to 4 , by first and second load beams 23 and 24 , a resilient hinge 25 coupled with both these first and second load beams 23 and 24 , a resilient flexure 26 fixed on the second load beam 24 and the hinge 25 , and a circular base plate 27 formed at an attaching section 23 a of the first load beam 23 .
- the flexure 26 has a flexible tongue 26 a depressed by a dimple (not shown) formed on the second load beam 24 at its one end section.
- a dimple not shown
- the flexure 26 has elasticity for supporting flexibly the magnetic head slider 21 through the actuator 22 by this tongue 26 a.
- the flexure 26 is made of in this embodiment a stainless steel plate (for example SUS304TA) with a thickness of about 20 ⁇ m.
- the flexure 26 is fixed with the second load beam 24 and with the hinge 25 at a plurality of points by pinpoint welding.
- the hinge 25 has elasticity providing, to the second load bean 24 , a force for pressing the magnetic head slider 21 toward the direction of a magnetic disk surface through the actuator 22 in operation.
- the hinge 25 is made of in this embodiment a stainless steel plate with a thickness of about 40 ⁇ m.
- the first load beam 23 is made of in this embodiment a stainless steel plate with a thickness of about 100 ⁇ m, and supports the whole surface of the hinge 25 .
- the fixing of the first load beam 23 with the hinge 25 is performed by pinpoint welding at a plurality of points.
- the second load beam 24 is also made of in this embodiment a stainless steel plate with a thickness of about 100 ⁇ m, and fixed to the hinge 25 at its rear end section. The fixing of the second load bean 24 with the hinge 25 is performed also by pinpoint welding at a plurality of points. At a top end of this second load beam 24 , formed is a lift-tab 24 a for separating the HGA from the magnetic-disk surface during out of operation is prepared.
- the base plate 27 to be attached to the drive arm 16 shown in FIG. 1 is made of in this embodiment a stainless steel or iron plate with a thickness of about 150 ⁇ m. This base plate 27 is fixed to the attaching section 23 a of the first load beam 23 by welding.
- a flexible conductor member 28 including a plurality of trace conductors of a thin-film multi-layered pattern is formed or disposed.
- the conductor member 28 is formed by a known method similar to the patterning method of forming a printed circuit board on a thin metal plate such as a flexible printed circuit (FPC).
- the member 28 is formed by sequentially depositing a first insulation material layer made of a resin such as polyimide with a thickness of about 5 ⁇ m, a patterned Cu layer (trace conductor layer) with a thickness of about 4 ⁇ m, and a second insulation material layer made of a resin such as polyimide with a thickness of about 5 ⁇ m on the flexure 26 in this order.
- a first insulation material layer made of a resin such as polyimide with a thickness of about 5 ⁇ m
- a patterned Cu layer trace conductor layer
- a second insulation material layer made of a resin such as polyimide with a thickness of about 5 ⁇ m
- the conductor member 28 consists of a first conductor member 28 a with two trace conductors connected to the magnetic head element for one side, thus four trace conductors for both sides, and a second conductor member 28 b with a trace conductor connected to the actuator 22 for one side, thus two trace conductors for both sides.
- One end of the trace conductors of the first conductor member 28 a is electrically connected to head element connection pads 29 formed on an individually separated and freely movable section 26 c of the flexure 26 .
- the connection pads 29 are ball-bonded to terminal electrodes 21 a of the magnetic head slider 21 by Au bonding, wire bonding or stitch bonding.
- the other end of the trace conductors of the first conductor member 28 a is electrically connected to external circuit connection pads 30 used for connection with an external circuit.
- One end of trace conductors of the second conductor member 28 b is electrically connected to actuator connection pads 31 formed on an insulation layer 26 b on the tongue 26 a of the flexure 26 .
- the connection pads 31 are connected to A channel and B channel signal terminals 22 b and 22 c of the actuator 22 , respectively.
- the other end of trace conductors of the second conductor member 28 b is electrically connected to the external circuit connection pads 30 .
- a structure of the HGA according to the present invention is not limited to the aforementioned structure. Furthermore, although it is not shown, a head drive IC chip may be mounted on a middle of the suspension 20 .
- FIG. 5 illustrates a structure of the actuator 22 in the embodiment of FIG. 1
- FIG. 6 illustrates a structure of a piezoelectric element section of the actuator 22
- FIG. 7 illustrates moving operation of this actuator 22 .
- the actuator 22 has a rough U-plane shape and consists of a base 50 ( 22 a ) to be fixed to a suspension and a pair of movable arms 51 and 52 perpendicularly extending from both side ends of the base 50 .
- a base 50 22 a
- movable arms 51 and 52 perpendicularly extending from both side ends of the base 50 .
- Slide fixing sections 53 and 54 are formed respectively to be fixed to side surfaces of the magnetic head slider 21 so that the slider 21 is caught in a space between the slider fixing sections 53 and 54 .
- the spacing between the slider fixing sections 53 and 54 is determined to a value slightly shorter than the width of the magnetic head slider to be caught therein.
- a thickness of the actuator 22 is determined to a value equal to or thinner than that of the magnetic head slider to be held so that the total thickness of the HGA will not increase due to the mounting of the actuator. Conversely, by thickening the actuator 22 up to the thickness of the magnetic head slider to be held, strength of the actuator itself can be increased without increasing the total thickness of the HGA.
- the slider fixing sections 53 and 54 are projected inwardly, namely toward the magnetic head slider 21 , so that only these sections 53 and 54 are attached to the side surfaces of the magnetic head slider 21 and that there exists air gaps between the remaining sections of the movable arms 51 and 52 and the side surfaces of the magnetic head slider 21 .
- the movable arms 51 and 52 consist of arm members 51 a and 52 a and piezoelectric elements 51 b and 52 b formed on side surfaces of the arm members 51 a and 52 a, respectively.
- the base 50 and the arm members 51 a and 52 a of the actuator 22 are united by an elastic sintered ceramic such as ZrO 2 for example. Since the main sections of the actuator are made of the elastic sintered ceramic such as ZrO 2 that is strong for bending, a shock resistance of the actuator itself increases.
- Each of the piezoelectric elements 51 b and 52 b has, as shown in FIG. 6, a multi-layered structure of alternately laminating piezoelectric material layers 60 , signal electrode layers 61 and ground (common) electrode layers 62 .
- the piezoelectric material layers 60 expand and contract.
- the piezoelectric material layer 60 is made of material that expands and contracts by reverse piezoelectric effect or by electrostrictive effect.
- the signal electrode Layers 61 are electrically connected to the A channel signal terminal 22 b or the B channel signal terminal 22 c, and the ground (common) electrode layers 62 are electrically connected to ground (common) terminal 22 d or 22 e, shown in FIGS. 3 and 4.
- the layers 60 are made of piezoelectric material such as PZT (Lead Zirconate Titanate Oxidization)
- these piezoelectric material layers are in general polarized so as to improve their displacement performance.
- the polarized direction is the lamination direction of the piezoelectric material layers 60 .
- the piezoelectric material layer between the electrode layers expands in its lamination direction (piezoelectric longitudinal effect) and contracts in its in-plane direction (piezoelectric lateral effect).
- the piezoelectric material layer between the electrode layers contracts in its lamination direction (piezoelectric longitudinal effect) and expands in its in-plane direction (piezoelectric lateral effect).
- the piezoelectric element 51 b or 52 b contracts or expands in response to the applied voltage polarity and thus the movable arm 51 or 52 bends to trace a S-character as shown in FIG. 7 resting the top end section of the arm 51 or 52 to laterally and linearly displace.
- the magnetic head slider 21 fixed with the actuator 22 also laterally and linearly displaces. Since the slider displaces namely oscillates with linear motion not swinging or rotational motion, more precise positioning of the magnetic head element can be expected.
- one of the piezoelectric elements is expanded and therefore the direction of the driving voltage opposes to that of the polarization in the piezoelectric material layer.
- the applied voltage is high or the voltage is continuously applied, attenuation in polarization of the piezoelectric material layer may occur.
- a constant DC bias voltage in the same direction as the polarization direction be additionally applied to the AC voltage to form the driving voltage so that the direction of the driving voltage never opposes to that of the polarization in the piezoelectric material layer.
- the oscillation of the movable arms is centered when only the bias voltage is applied to the piezoelectric elements.
- the piezoelectric material is material that expands or contracts by their reverse piezoelectric effect or electrostrictive effect. Any piezoelectric material applicable for the piezoelectric elements of the actuator can be used. However, for high rigidity, it is desired to use a ceramics piezoelectric material such as PZT[Pb(Zr,Ti)O 3 ], PT(PbTiO 3 ), PLZT[(Pb,La)(Zr,Ti)O 3 ], or barium titanate (BaTiO 3 ).
- the actuator 22 in this embodiment holds the side surfaces of the magnetic head slider 21 so that the slider 21 is caught in a space between the movable arms 51 and 52 , the thickness of the HGA around the magnetic head slider does not increase even if the actuator 22 is attached. Thus, no modifications in size of the magnetic disk drive apparatus due to the mounting of the actuator is necessary. Also, since the actuator 22 and the magnetic head slider 21 are not stacked to form a cantilever structure, a shock resistance can be greatly improved. Furthermore, since the magnetic head slider 21 is caught in between the movable arms 51 and 52 , the top end sections of the movable arms 51 and 52 , which actually transfer the displacement to the slider 21 , can be always positioned at the top end of the slider 21 . Thus, it is possible to provide a constant travel to the slider even if the size of the magnetic head slider 21 changes, and therefore an enough stroke of the magnetic head at the precise positioning operation can be always obtained.
- FIGS. 8, 9 10 a and 10 b illustrate parts of a manufacturing process of the HGA in this embodiment.
- a magnetic head slider 21 and an actuator 22 are prepared.
- the magnetic head slider 21 is fabricated by a known manufacturing method.
- the actuator 22 may be fabricated for example by forming rectangular tube with a U-section as shown in FIG. 5, namely with three side faces and one entirely opened side face, made of a sintered ceramic such as for example ZrO 2 , by forming or printing continuous piezoelectric elements with the section shown in FIG. 6 on the both side faces of the tube, by cutting the tube perpendicularly to its axis with a predetermined interval to separate into individual actuator frames, and by forming terminal electrodes on each separated actuator frame.
- the magnetic head slider 21 and the actuator 22 are assembled.
- an adhesive 80 such as a thermosetting epoxy resin family adhesive is coated on parts of both side surfaces of the magnetic head slider 21 .
- the slider 21 is disposed on a flat plate 81 and inserted between the movable arms 51 and 52 of the actuator 22 that is also disposed on the flat plate 81 .
- the spacing WA between the movable arms 51 and 52 of the actuator 22 is set a little smaller than the width W S of the magnetic head slider 21 .
- the magnetic head slider 21 can be provisionally fixed between the movable arms 51 and 52 by a pinching force of these arms without using any holder. Then, by thermally curing the adhesive 80 , the slider 21 is securely fixed to the movable arms 51 and 52 .
- the assembly 82 of the magnetic head slider 21 and the actuator 22 is fixed on the flexure 26 of the suspension 20 . More concretely, adhesive 90 and 91 are coated on the insulation layer 26 b on the tongue 26 a of the flexure 26 and on the separated section 26 c of the flexure 26 , respectively, and the base 22 a ( 50 ) of the actuator 22 of the assembly 82 and the top end section of the magnetic head slider 21 of the assembly 82 are adhered on the insulation layer 26 b and on the separated section 26 c, respectively.
- the A channel and B channel signal terminals 22 b and 22 c (FIG. 3) of the actuator 22 are electrically connected with the actuator connection pads 31 by soldering or using silver containing epoxy resin.
- the ground (common) terminals 22 d and 22 e (FIG. 3) of the actuator 22 are electrically connected with ground (common) connection pads 100 by soldering or using silver containing epoxy resin. If the soldering is used for the connection, connection strength of the assembly 82 with the suspension will increase.
- the terminals electrodes 21 a (FIG. 3) of the magnetic head slider 21 are electrically connected to the head element connection pads 29 by Au ball-bonding for example.
- the assembly 82 has a simple shape, the above-mentioned processes of adhesion and electrical connection of the assembly 82 with the suspension can be performed by using a general HGA assembling equipment resulting the productivity to extremely improve and thus the manufacturing cost to reduce.
- FIG. 11 schematically illustrates a structure of an actuator in another element according to the present invention.
- this actuator has a rough U-plane shape and consists of a base 110 to be fixed to a suspension and a pair of movable arms 111 and 112 perpendicularly extending from both side ends of the base 110 .
- a base 110 to be fixed to a suspension
- a pair of movable arms 111 and 112 perpendicularly extending from both side ends of the base 110 .
- slider fixing sections 113 and 114 are formed respectively to be fixed to side surfaces of a magnetic head slider 21 .
- the slider fixing sections 113 and 114 are projected inwardly, namely toward the magnetic head slider 21 , so that only these sections 113 and 114 are attached to the side surfaces of the magnetic head slider 21 and that there exists air gaps between the remaining sections of the movable arms 111 and 112 and the side surfaces of the magnetic head slider 21 .
- the movable arms 111 and 112 consist of aim members 111 a and 112 a and piezoelectric elements 111 b and 112 b formed on side surfaces of the arm members 111 a and 112 a, respectively.
- the base 110 and the arm members 111 a and 112 a of the actuator are united by an elastic sintered ceramic such as ZrO 2 for example. Since the main sections of the actuator are made of the elastic sintered ceramic such as ZrO 2 that is strong for bending, a shock resistance of the actuator itself increases.
- corner reinforcements 115 to 118 are formed at inner corners at the coupling sections of the movable arms 111 and 112 and the base 110 and at inner corners at the coupling sections of the movable arms 111 and 112 and the slider fixing sections 113 and 114 so that these inner corners have a plane shape with an obtuse angle not a right angle as those of the actuator shown in FIG. 5.
- the corner reinforcements 115 to 118 are united with the base 110 and the arm members 111 a and 112 a by the same sintered ceramic. Thus, the shock resistance of the actuator itself is extremely improved.
- FIG. 12 schematically illustrates a structure of an actuator in a further embodiment according to the present invention.
- this actuator has a rough U-plane shape and consists of a base 120 to be fixed to a suspension and a pair of movable arms 121 and 122 perpendicularly extending from both side ends of the base 120 .
- a base 120 to be fixed to a suspension
- a pair of movable arms 121 and 122 perpendicularly extending from both side ends of the base 120 .
- slider fixing sections 123 and 124 are formed respectively to be fixed to side surfaces of a magnetic head slider 21 .
- the slider fixing sections 123 and 124 are projected inwardly, namely toward the magnetic head slider 21 , so that only these sections 123 and 124 are attached to the side surfaces of the magnetic head slider 21 and that there exists air gaps between the remaining sections of the movable arms 121 and 122 and the side surfaces of the magnetic head slider 21 .
- the movable arms 121 and 122 consist of arm members 121 a and 122 a and piezoelectric elements 121 b and 122 b formed on side surfaces of the arm members 121 a and 122 a, respectively.
- the base 120 and the arm members 121 a and 122 a of the actuator are united by an elastic sintered ceramic such as ZrO 2 for example. Since the main sections of the actuator are made of the elastic sintered ceramic such as ZrO 2 that is strong for bending, a shock resistance of the actuator itself increases.
- corner reinforcements 125 to 128 are formed at inner corners at the coupling sections of the movable arms 121 and 122 and the base 120 and at inner corners at the coupling sections of the movable arms 121 and 122 and the slider fixing sections 123 and 124 so that these inner corners have a smooth plane shape not a right angle plane shape as those of the actuator shown in FIG. 5.
- the corner reinforcements 125 to 128 are united with the base 120 and the arm members 121 a and 122 a by the same sintered ceramic. Thus, the shock resistance of the actuator itself is extremely improved.
- FIG. 13 schematically illustrates a structure of an actuator in a still further embodiment according to the present invention.
- this actuator has a rough U-plane shape and consists of a base 130 to be fixed to a suspension and a pair of movable arms 131 and 132 perpendicularly extending from both side ends of the base 130 .
- movable arms 131 and 132 At top end sections of the movable arms 131 and 132 , formed respectively are slider fixing sections 133 and 134 to be fixed to side surfaces of a magnetic head slider 21 .
- the slider fixing sections 133 and 134 are projected inwardly, namely toward the magnetic head slider 21 , so that only these sections 133 and 134 are attached to the side surfaces of the magnetic head slider 21 and that there exists air gaps between the remaining sections of the move arms 131 and 132 and the side surfaces of the magnetic head slider 21 .
- the movable arms 131 and 132 consist of arm member 131 a and 132 a and piezoelectric elements 131 b and 132 b formed on side surfaces of the arm members 131 a and 132 a, respectively.
- the base 130 and the arm members 131 a and 132 a of the actuator are united by an elastic sintered ceramic such as ZrO 2 for example. Since the main sections of the actuator are made of the elastic sintered ceramic such as ZrO 2 that is strong for bending, a shock resistance of the actuator itself increases.
- corner reinforcements 135 to 138 made of epoxy resin are additionally formed at inner corners at the coupling sections of the movable arms 131 and 132 and the base 130 and at inner corners at the coupling sections of the movable arms 131 and 132 and the slider fixing sections 133 and 134 .
- the shock resistance of the actuator itself is extremely improved.
Landscapes
- Supporting Of Heads In Record-Carrier Devices (AREA)
- Moving Of The Head To Find And Align With The Track (AREA)
- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
Abstract
A precise positioning actuator to be fixed with a head slider with at least one head element and with a support, for precisely positioning the at least one head element, includes a pair of movable arms capable of displacing in response to a drive signal applied to the actuator The head slider is caught in a space between the movable arms.
Description
- The present invention relates to a precise positioning actuator for a head element such as a thin-film magnetic head element or an optical head element, to a head gimbal assembly (HGA), with the actuator, to a disk drive apparatus with the HGA and to a manufacturing method of an HGA.
- In a magnetic disk drive apparatus, thin-film magnetic head elements for writing magnetic information into and/or reading magnetic information from magnetic disks are in general formed on magnetic head sliders flying in operation above the rotating magnetic disks. The sliders are supported at top end sections of suspensions of HGAs, respectively.
- Recently, recording and reproducing density along the radial direction or along the track width direction in the magnetic disk (track density) rapidly increase to satisfy the requirement for ever increasing data storage capacities and densities in today's magnetic disk drive apparatus. For advancing the track density, the position control of the magnetic head element with respect to the track in the magnetic disk by a voice coil motor (VCM) only has never presented enough accuracy.
- In order to solve this problem, an additional actuator mechanism is mounted at a position nearer to the magnetic head slider than the VCM so as to perform fine precise positioning that cannot be realized by the VCM only. The techniques for realizing precise positioning of the magnetic head are described in for example U.S. Pat. No. 5,745,319 and Japanese patent publication No. 08180623 A.
- Inventors of this application have been proposed a piggy-back structure actuator. This piggy-back structure actuator is formed by piezoelectric material of PZT in an I-character shape with one end section to be fixed to a suspension, the other end section to be fixed to a magnetic head slider and a pillar shaped movable arm connected between these end sections. On the suspension, stepwise stacked are the actuator and the magnetic head slider, namely, the actuator is caught between the suspension and the slider to form a stacked cantilever structure.
- However, an HGA with such piggy-back structure actuator will have following various problems:
- (1) Because of the stepwise stacked structure, a total thickness of the HGA around the magnetic head slider increases by the thickness of the actuator;
- (2) The actuator as a whole consists of piezoelectric material such as PZT of a brittle material, and the actuator and the magnetic head slider are stacked to form a cantilever structure. A shock easily occurs with a moment and also shock resistance is very poor;
- (3) Depending upon the size of the magnetic head slider, a travel of the magnetic head element during the precise positioning operation varies. Thus, it is difficult to obtain enough stroke;
- (4) Because of three-dimensional and complicated attachment structure of the actuator, the handling at the time of an assembly of the HGA is very difficult and it is impossible to use a conventional HGA assembly equipment causing productivity to be very worse; and
- (5) In order not to interfere with the movement of the actuator, it is necessary to assemble with keeping a gap between the actuator and the magnetic head slider and also between the actuator and the suspension. However, forming of such gap will more decease the shock resistance and it is difficult to precisely keep the gap constant. Particularly, since it is difficult to keep the suspension, the actuator and the magnetic head slider in parallel precisely, the head characteristics deteriorates.
- It is therefore an object of the present invention to provide a precise positioning actuator for a head element, an HGA with the actuator, a disk drive apparatus with the HGA and a manufacturing method of an HGA, whereby a thickness of the HGA will not increase even if the actuator is mounted thereto.
- Another object of the present invention is to provide a precise positioning actuator for a head element, an HGA with the actuator, a disk drive apparatus with the HGA and a manufacturing method of an HGA, whereby a shock resistance can be greatly improved.
- Further object of the present invention is to provide a precise positioning actuator for a head element, an HGA with the actuator, a disk drive apparatus with the HGA and a manufacturing method of an HGA, whereby the productivity and also quality of the HGA can be greatly improved.
- According to the present invention, a precise positioning actuator to be fixed with a head slider with at least one head element and with a support, for precisely positioning the at least one head element, includes a pair of movable arms capable of displacing in response to a drive signal applied to the actuator The head slider is caught in a space between the movable arms.
- Since the head slider is caught in a space between the movable arms capable of displacing in response to a drive signal applied thereto, the thickness of an HGA around the head slider does not increase even if the actuator is attached. Thus, no modifications in size of a disk drive apparatus due to the mounting of the actuator is necessary. Also, since the actuator and the head slider are not stacked to form a cantilever structure, a shock resistance can be greatly improved. Furthermore, since the head slider is caught in between the movable arms, the top end sections of the movable arms, which actually transfer the displacement to the head slider, can be always positioned at the top end of the head slider. Thus, it is possible to provide a constant travel to the head slider even if its size changes, and therefore an enough stroke of the head element at the precise positioning operation can be always obtained.
- It is preferred that the actuator further includes a base fixed to the support and that the movable arms extend from the base.
- It is also preferred that the movable arms have at their top end sections slider fixing sections to be fixed to side surfaces of the head slider, respectively. In this case, preferably, the actuator has a shape so that there exists air gaps between the movable arms and side surfaces of the head slider except for the slider fixing sections, respectively.
- It is also preferred that the base is made of an elastic sintered ceramic. Furthermore, it is preferred that each of the movable arms includes an arm member made of an elastic sintered ceramic, and a piezoelectric element formed on a side surface of the arm member. Since the main sections of the actuator are made of elastic sintered ceramic such as ZrO2 that is strong for bending, a shock resistance of the actuator itself increases.
- It is preferred that the movable arms is constituted so that the head slider is linearly and laterally oscillated in response to the drive signal. Since the head slider displaces namely oscillates with linear motion not swinging or rotational motion, more precise positioning of the head element can be expected.
- It is also preferred that inner corners at coupling sections of the base and the movable arms have an obtuse angle plane shape or a smooth plane shape. Thus, the shock resistance of the actuator itself is extremely improved.
- It is preferred that the actuator has a rough U-plane shape.
- It is also preferred that the actuator has a thickness equal to or less than a thickness of a head slider to be caught.
- It is preferred that a spacing between the pair of movable arms is determined to a value slightly shorter than a width of the head slider to be caught.
- It is preferred that the at least one head element is at least one thin-film magnetic head element.
- According to the present invention, an HGA includes a head slider with at least one head element, a support and the aforementioned precise positioning actuator fixed with the head slider and with the support for precisely positioning the at least one head element.
- It is preferred that the movable arms of the actuator and the head slider are fixed with an adhesive.
- It is also preferred that the actuator and the support are fixed with an adhesive or a solder.
- According to the present invention, a disk drive apparatus having at least one HGA mentioned above.
- Also, according to the present invention, a manufacturing method of an HGA includes a step of preparing a precise positioning actuator with a pair of movable arms capable of displacing in response to a drive signal applied thereto, a step of catching a head slider with at least one head element in a space between the movable arms of the actuator, and a step of fixing the actuator with the caught head slider to the support.
- First, the head slider is caught in a space between the movable arms of the actuator, and then the actuator with the caught head slider is fixed to the support. Since assembling of the head slider and the actuator can be carried out on the flat plate, alignment of the slider and the actuator becomes easy resulting that a higher accuracy assembling can be expected. Also, since a thermosetting adhesive with excellent curing performance although it needs a long curing time can be used, a high quality assembly of the head slider and the actuator can be obtained. Furthermore, since the assembly has a simple shape, adhesion and electrical connection of the assembly with a suspension can be performed by using a general HGA assembling equipment resulting the productivity to extremely improve and thus the manufacturing cost to reduce.
- It is preferred that the catching step includes fixing the head slider between the movable arms with an adhesive.
- It is also preferred that a spacing between the pair of movable arms is slightly shorter than a width of the head slider to be caught, and that the catching step includes provisionally fixing the head slider between the movable arms by a pinching force of the movable arms. The provisional fixing can be attained without using any holder.
- It is preferred that the catching step includes securely fixing the head slider to the movable arms by thermally curing the adhesive after the provisional fixing.
- It is also preferred that the fixing step includes fixing the actuator to the support with an adhesive or a solder Further objects and advantages of the present invention will be apparent from the following description of the preferred embodiments of the invention as illustrated in the accompanying drawings.
- FIG. 1 is an oblique view schematically illustrating main components of a magnetic disk drive apparatus in a preferred embodiment according to the present invention;
- FIG. 2 is an oblique view illustrating the whole structure of an HGA in the embodiment of FIG. 1;
- FIG. 3 is an oblique view illustrating a top end section of the HGA in the embodiment of FIG. 1;
- FIG. 4 is an oblique view illustrating the top end section of the HGA in the embodiment of FIG. 1, seen from different direction from that of FIG. 3;
- FIG. 5 is a plane view illustrating a structure of an actuator in the embodiment of FIG. 1;
- FIG. 6 is a sectional view illustrating a structure of a piezoelectric element section of the actuator shown in FIG. 5;
- FIG. 7 is an oblique view illustrating an operation of the actuator shown in FIG. 5;
- FIG. 8 is an oblique view illustrating a part of a manufacturing process of the HGA in the embodiment of FIG. 1;
- FIG. 9 is an oblique view illustrating a part of a manufacturing process of the HGA in the embodiment of FIG. 1;
- FIGS. 10a and 10 b are oblique views illustrating a part of a manufacturing process of the HGA in the embodiment of FIG. 1;
- FIG. 11 is an oblique view schematically illustrating a structure of an actuator in another embodiment according to the present invention;
- FIG. 12 is an oblique view schematically illustrating a structure of an actuator in a further embodiment according to the present invention; and
- FIG. 13 is an oblique view schematically illustrating a structure of an actuator in a still further embodiment according to the present invention.
- FIG. 1 illustrates main components of a magnetic disk unit of a preferred embodiment according to the present invention, FIG. 2 illustrates the whole structure of an HGA in this embodiment, and FIGS. 3 and 4 illustrate a top end section of the HGA in this embodiment, seen from different directions with each other.
- In FIG. 1,
reference numeral 10 denotes a plurality of magnetic hard disks rotating around anaxis assembly carriage device 12 is mainly constituted by acarriage 14 capable of rotating around anaxis 13 and amain actuator 15 such as for example a voice coil motor (VCM) for driving thecarriage 14 to rotate. - Base sections at one ends of a plurality of
drive arms 16 stacked along theaxis 13 are attached to thecarriage 14, and one or twoHGAs 17 are mounted on a top section at the other end of eacharm 16. Each of theHGAs 17 has a slider mounted at its top end section so that the slider opposes to one surface (recording and reproducing surface) of each of themagnetic disks 10. - As shown in FIGS.2 to 4, the HGA is assembled by fixing a
fine tracking actuator 22 for precise positioning of a thin-film magnetic head element to a top end section of asuspension 20. Theactuator 22 holds side surfaces of amagnetic head slider 21 with the thin-film magnetic head element so that theslider 21 is caught in a space between its movable arms. - A main or course actuator of
VCM 15 shown in FIG. 1 is used for rotationally moving thedrive arm 16 to which such HGA is attached, so as to move the whole assembly. Theactuator 22 contributes the fine positioning of the HGA, which cannot be adjusted by the main orcourse actuator 15. - The
suspension 20 is substantially formed, as shown in FIGS. 2 to 4, by first and second load beams 23 and 24, aresilient hinge 25 coupled with both these first and second load beams 23 and 24, aresilient flexure 26 fixed on thesecond load beam 24 and thehinge 25, and acircular base plate 27 formed at an attachingsection 23 a of thefirst load beam 23. - The
flexure 26 has aflexible tongue 26 a depressed by a dimple (not shown) formed on thesecond load beam 24 at its one end section. On thetongue 26 a, fixed is abase section 22 a of theactuator 22 via aninsulation layer 26 b made of for example polyimide. - The
flexure 26 has elasticity for supporting flexibly themagnetic head slider 21 through theactuator 22 by thistongue 26 a. Theflexure 26 is made of in this embodiment a stainless steel plate (for example SUS304TA) with a thickness of about 20 μm. Theflexure 26 is fixed with thesecond load beam 24 and with thehinge 25 at a plurality of points by pinpoint welding. - The
hinge 25 has elasticity providing, to thesecond load bean 24, a force for pressing themagnetic head slider 21 toward the direction of a magnetic disk surface through theactuator 22 in operation. Thehinge 25 is made of in this embodiment a stainless steel plate with a thickness of about 40 μm. - The
first load beam 23 is made of in this embodiment a stainless steel plate with a thickness of about 100 μm, and supports the whole surface of thehinge 25. The fixing of thefirst load beam 23 with thehinge 25 is performed by pinpoint welding at a plurality of points. - The
second load beam 24 is also made of in this embodiment a stainless steel plate with a thickness of about 100 μm, and fixed to thehinge 25 at its rear end section. The fixing of thesecond load bean 24 with thehinge 25 is performed also by pinpoint welding at a plurality of points. At a top end of thissecond load beam 24, formed is a lift-tab 24 a for separating the HGA from the magnetic-disk surface during out of operation is prepared. - The
base plate 27 to be attached to thedrive arm 16 shown in FIG. 1 is made of in this embodiment a stainless steel or iron plate with a thickness of about 150 μm. Thisbase plate 27 is fixed to the attachingsection 23 a of thefirst load beam 23 by welding. - On the
flexure 26, aflexible conductor member 28 including a plurality of trace conductors of a thin-film multi-layered pattern is formed or disposed. Theconductor member 28 is formed by a known method similar to the patterning method of forming a printed circuit board on a thin metal plate such as a flexible printed circuit (FPC). For example, themember 28 is formed by sequentially depositing a first insulation material layer made of a resin such as polyimide with a thickness of about 5 μm, a patterned Cu layer (trace conductor layer) with a thickness of about 4 μm, and a second insulation material layer made of a resin such as polyimide with a thickness of about 5 μm on theflexure 26 in this order. Within the regions of the connection pads formed for connecting with the actuator, the magnetic head element and an external circuit, an Au layer is deposited on the Cu layer and there is no second insulation material layer on the Au layer. - In this embodiment, the
conductor member 28 consists of afirst conductor member 28 a with two trace conductors connected to the magnetic head element for one side, thus four trace conductors for both sides, and asecond conductor member 28 b with a trace conductor connected to theactuator 22 for one side, thus two trace conductors for both sides. - One end of the trace conductors of the
first conductor member 28 a is electrically connected to headelement connection pads 29 formed on an individually separated and freelymovable section 26 c of theflexure 26. Theconnection pads 29 are ball-bonded toterminal electrodes 21 a of themagnetic head slider 21 by Au bonding, wire bonding or stitch bonding. The other end of the trace conductors of thefirst conductor member 28 a is electrically connected to externalcircuit connection pads 30 used for connection with an external circuit. - One end of trace conductors of the
second conductor member 28 b is electrically connected toactuator connection pads 31 formed on aninsulation layer 26 b on thetongue 26 a of theflexure 26. Theconnection pads 31 are connected to A channel and Bchannel signal terminals actuator 22, respectively. The other end of trace conductors of thesecond conductor member 28 b is electrically connected to the externalcircuit connection pads 30. - A structure of the HGA according to the present invention is not limited to the aforementioned structure. Furthermore, although it is not shown, a head drive IC chip may be mounted on a middle of the
suspension 20. - FIG. 5 illustrates a structure of the
actuator 22 in the embodiment of FIG. 1, FIG. 6 illustrates a structure of a piezoelectric element section of theactuator 22 and FIG. 7 illustrates moving operation of thisactuator 22. - As will be noted from FIG. 5, the
actuator 22 has a rough U-plane shape and consists of a base 50 (22 a) to be fixed to a suspension and a pair ofmovable arms base 50. At top end sections of themovable arms slider fixing sections magnetic head slider 21 so that theslider 21 is caught in a space between theslider fixing sections slider fixing sections actuator 22 is determined to a value equal to or thinner than that of the magnetic head slider to be held so that the total thickness of the HGA will not increase due to the mounting of the actuator. Conversely, by thickening the actuator 22 up to the thickness of the magnetic head slider to be held, strength of the actuator itself can be increased without increasing the total thickness of the HGA. - The
slider fixing sections magnetic head slider 21, so that only thesesections magnetic head slider 21 and that there exists air gaps between the remaining sections of themovable arms magnetic head slider 21. - The
movable arms arm members piezoelectric elements arm members - The
base 50 and thearm members actuator 22 are united by an elastic sintered ceramic such as ZrO2 for example. Since the main sections of the actuator are made of the elastic sintered ceramic such as ZrO2 that is strong for bending, a shock resistance of the actuator itself increases. - Each of the
piezoelectric elements piezoelectric material layer 60 is made of material that expands and contracts by reverse piezoelectric effect or by electrostrictive effect. The signal electrode Layers 61 are electrically connected to the Achannel signal terminal 22 b or the Bchannel signal terminal 22 c, and the ground (common) electrode layers 62 are electrically connected to ground (common) terminal 22 d or 22 e, shown in FIGS. 3 and 4. - In case that the
layers 60 are made of piezoelectric material such as PZT (Lead Zirconate Titanate Oxidization), these piezoelectric material layers are in general polarized so as to improve their displacement performance. The polarized direction is the lamination direction of the piezoelectric material layers 60. When voltage is applied across the electrode layers and the direction of the produced electrical field is the same as the polarized direction, the piezoelectric material layer between the electrode layers expands in its lamination direction (piezoelectric longitudinal effect) and contracts in its in-plane direction (piezoelectric lateral effect). Contrary to this, when the direction of the produced electrical field is in inverse as the polarized direction, the piezoelectric material layer between the electrode layers contracts in its lamination direction (piezoelectric longitudinal effect) and expands in its in-plane direction (piezoelectric lateral effect). - If the voltage with a polarity which will induce the contraction or expansion is applied to the
piezoelectric element movable arm arm magnetic head slider 21 fixed with theactuator 22 also laterally and linearly displaces. Since the slider displaces namely oscillates with linear motion not swinging or rotational motion, more precise positioning of the magnetic head element can be expected. - It is possible to apply voltages that induce mutually reverse motions may be simultaneously applied to the
piezoelectric elements piezoelectric elements - However, one of the piezoelectric elements is expanded and therefore the direction of the driving voltage opposes to that of the polarization in the piezoelectric material layer. Thus, if the applied voltage is high or the voltage is continuously applied, attenuation in polarization of the piezoelectric material layer may occur. It is desired therefore that a constant DC bias voltage in the same direction as the polarization direction be additionally applied to the AC voltage to form the driving voltage so that the direction of the driving voltage never opposes to that of the polarization in the piezoelectric material layer. The oscillation of the movable arms is centered when only the bias voltage is applied to the piezoelectric elements.
- In this specification, the piezoelectric material is material that expands or contracts by their reverse piezoelectric effect or electrostrictive effect. Any piezoelectric material applicable for the piezoelectric elements of the actuator can be used. However, for high rigidity, it is desired to use a ceramics piezoelectric material such as PZT[Pb(Zr,Ti)O3], PT(PbTiO3), PLZT[(Pb,La)(Zr,Ti)O3], or barium titanate (BaTiO3).
- As aforementioned, since the
actuator 22 in this embodiment holds the side surfaces of themagnetic head slider 21 so that theslider 21 is caught in a space between themovable arms actuator 22 is attached. Thus, no modifications in size of the magnetic disk drive apparatus due to the mounting of the actuator is necessary. Also, since theactuator 22 and themagnetic head slider 21 are not stacked to form a cantilever structure, a shock resistance can be greatly improved. Furthermore, since themagnetic head slider 21 is caught in between themovable arms movable arms slider 21, can be always positioned at the top end of theslider 21. Thus, it is possible to provide a constant travel to the slider even if the size of themagnetic head slider 21 changes, and therefore an enough stroke of the magnetic head at the precise positioning operation can be always obtained. - FIGS. 8, 910 a and 10 b illustrate parts of a manufacturing process of the HGA in this embodiment.
- First, a
magnetic head slider 21 and anactuator 22 are prepared. Themagnetic head slider 21 is fabricated by a known manufacturing method. Theactuator 22 may be fabricated for example by forming rectangular tube with a U-section as shown in FIG. 5, namely with three side faces and one entirely opened side face, made of a sintered ceramic such as for example ZrO2, by forming or printing continuous piezoelectric elements with the section shown in FIG. 6 on the both side faces of the tube, by cutting the tube perpendicularly to its axis with a predetermined interval to separate into individual actuator frames, and by forming terminal electrodes on each separated actuator frame. - Then, as shown in FIG. 8, the
magnetic head slider 21 and theactuator 22 are assembled. First, an adhesive 80 such as a thermosetting epoxy resin family adhesive is coated on parts of both side surfaces of themagnetic head slider 21. Then, theslider 21 is disposed on aflat plate 81 and inserted between themovable arms actuator 22 that is also disposed on theflat plate 81. - The spacing WA between the
movable arms actuator 22 is set a little smaller than the width WS of themagnetic head slider 21. Thus, themagnetic head slider 21 can be provisionally fixed between themovable arms slider 21 is securely fixed to themovable arms - An
assembly 82 of themagnetic head slider 21 and theactuator 22 is thus formed. - Since assembling of the
magnetic head slider 21 and theactuator 22 can be carried out on the flat plate, alignment of the slider and the actuator becomes easy resulting that a higher accuracy assembling can be expected. Also, since a thermosetting adhesive with excellent curing performance although it needs a long curing time can be used, ahigh quality assembly 82 of themagnetic head slider 21 and theactuator 22 can be obtained. - Then, as shown in FIG. 9, the
assembly 82 of themagnetic head slider 21 and theactuator 22 is fixed on theflexure 26 of thesuspension 20. More concretely, adhesive 90 and 91 are coated on theinsulation layer 26 b on thetongue 26 a of theflexure 26 and on the separatedsection 26 c of theflexure 26, respectively, and the base 22 a (50) of theactuator 22 of theassembly 82 and the top end section of themagnetic head slider 21 of theassembly 82 are adhered on theinsulation layer 26 b and on the separatedsection 26 c, respectively. - Then, as shown in FIGS. 3 and 10a, the A channel and B
channel signal terminals actuator 22 are electrically connected with theactuator connection pads 31 by soldering or using silver containing epoxy resin. Also, the ground (common)terminals actuator 22 are electrically connected with ground (common)connection pads 100 by soldering or using silver containing epoxy resin. If the soldering is used for the connection, connection strength of theassembly 82 with the suspension will increase. - Thereafter, as shown in FIGS. 3 and 10b, the
terminals electrodes 21 a (FIG. 3) of themagnetic head slider 21 are electrically connected to the headelement connection pads 29 by Au ball-bonding for example. - Since the
assembly 82 has a simple shape, the above-mentioned processes of adhesion and electrical connection of theassembly 82 with the suspension can be performed by using a general HGA assembling equipment resulting the productivity to extremely improve and thus the manufacturing cost to reduce. - FIG. 11 schematically illustrates a structure of an actuator in another element according to the present invention.
- As shown in the figure, this actuator has a rough U-plane shape and consists of a base110 to be fixed to a suspension and a pair of
movable arms base 110. At top end sections of themovable arms slider fixing sections magnetic head slider 21. - The
slider fixing sections magnetic head slider 21, so that only thesesections magnetic head slider 21 and that there exists air gaps between the remaining sections of themovable arms magnetic head slider 21. - The
movable arms aim members piezoelectric elements arm members - The
base 110 and thearm members - Configurations and operations of the
piezoelectric elements - In the element shown in FIG. 11,
corner reinforcements 115 to 118 are formed at inner corners at the coupling sections of themovable arms base 110 and at inner corners at the coupling sections of themovable arms slider fixing sections corner reinforcements 115 to 118 are united with thebase 110 and thearm members - Other configurations, operations and advantages of this embodiment are the same as those of the embodiment of FIG. 2.
- FIG. 12 schematically illustrates a structure of an actuator in a further embodiment according to the present invention.
- As shown in the figure, this actuator has a rough U-plane shape and consists of a base120 to be fixed to a suspension and a pair of
movable arms base 120. At top end sections of themovable arms slider fixing sections magnetic head slider 21. - The
slider fixing sections magnetic head slider 21, so that only thesesections magnetic head slider 21 and that there exists air gaps between the remaining sections of themovable arms magnetic head slider 21. - The
movable arms arm members piezoelectric elements arm members - The
base 120 and thearm members - Configurations and operations of the
piezoelectric elements - In the embodiment shown in FIG. 12,
corner reinforcements 125 to 128 are formed at inner corners at the coupling sections of themovable arms base 120 and at inner corners at the coupling sections of themovable arms slider fixing sections corner reinforcements 125 to 128 are united with thebase 120 and thearm members - Other configurations, operations and advantages of this embodiment are the same as those of the embodiment of FIG. 2.
- FIG. 13 schematically illustrates a structure of an actuator in a still further embodiment according to the present invention.
- As shown in the figure, this actuator has a rough U-plane shape and consists of a base130 to be fixed to a suspension and a pair of
movable arms base 130. At top end sections of themovable arms slider fixing sections magnetic head slider 21. - The
slider fixing sections magnetic head slider 21, so that only thesesections magnetic head slider 21 and that there exists air gaps between the remaining sections of themove arms magnetic head slider 21. - The
movable arms arm member piezoelectric elements arm members - The
base 130 and thearm members - Configurations and operations of the
piezoelectric elements - In the embodiment shown in FIG. 13,
corner reinforcements 135 to 138 made of epoxy resin are additionally formed at inner corners at the coupling sections of themovable arms base 130 and at inner corners at the coupling sections of themovable arms slider fixing sections - Other configurations, operations and advantages of this t are the same as those of the embodiment of FIG. 2.
- In the aforementioned emeodients, the precise positioning actuators for the thin-film magnetic head elements and the HGAs with the actuators are described. However, it is apparent that the present invention can be applied to a precise positioning actuator for a head element such as an optical head element other than the thin-film magnetic head element and an HGA with the actuator.
- Many widely different embodiments of the present invention may be constructed without departing from the spirit and scope of the present invention. It should be understood that the present invention is not limited to the specific embodiments described in the specification, except as defined in the appended claims.
Claims (38)
1. A precise positioning actuator to be fixed with a head slider with at least one head element and with a support, for precisely positioning said at least one head element, comprising:
a pair of movable arms capable of displacing in response to a drive signal applied to said actuator, for catching said head slider in a space between said movable arms.
2. The actuator as claimed in clam 1, wherein said actuator further comprises a base fixed to said support, said movable arms extending from said base.
3. The actuator as claimed in claim 2 , wherein said movable arms have at their top end sections slider fixing sections to be fixed to side surfaces of said head slider, respectively.
4. The actuator as claimed in claim 3 , wherein said actuator has a shape so that there exists air gaps between said movable arms and side surfaces of said head slider except for said slider fixing sections, respectively.
5. The actuator as claimed in claim 2 , wherein said base is made of an elastic sintered ceramic.
6. The actuator as claimed in claim 5 , wherein said elastic sintered ceramic is ZrO2.
7. The actuator as claimed in claim 2 , wherein each of said movable arms comprises an arm member made of an elastic sintered ceramic, and a piezoelectric element formed on a side surface of said arm m
8. The actuator as claimed in claim 7 , wherein said elastic sintered ceramic is ZrO2.
9. The actuator as claimed in claim 2 , wherein said movable arms is constituted so that said head slider is linearly and laterally oscillated in response to the drive signal.
10. The actuator as claimed in claim 2 , wherein inner corners at coupling sections of said base and said movable arms have an obtuse angle plane shape.
11. The actuator as claim in claim 2 , wherein inner corners at coupling sections of said base and said movable arms have a smooth plane shape.
12. The actuator as claimed in claim 1 , wherein said actuator has a rough U-plane shape.
13. The actuator as claimed in claim 1 , wherein said actuator has a thickness equal to or less than a thickness of a head slider to be caught.
14. The actuator as claimed in claim 1 , wherein a spacing between said pair of movable arms is determined to a value slightly shorter than a width of said head slider to be caught.
15. The actuator as claimed in claim 1 , wherein said at least one head element is at least one thin-film magnetic head element.
16. A head gimbal assembly including a head slider with at least one head element, a support and a precise positioning actuator fixed with said head slider and with said support for precisely positioning said at least one head element, said actuator comprising a pair of movable arms capable of displacing in response to a drive signal applied thereto, said head slider is caught in a space between said movable arms.
17. The head gimbal assembly as claimed in claim 16 , wherein said actuator further comprises a base fixed to said support, said movable arms extending from said base.
18. The head gimbal assembly as claimed in claim 17 , wherein said movable arms have at their top end sections slider fixing sections fixed to side surfaces of said head slider, respectively.
19. The head gimbal assembly as aimed in claim 18 , wherein said actuator has a shape so that there exists air gaps between said movable arms and side surfaces of said head slider except for said slider fixing sections, respectively.
20. The head gimbal assembly as claimed in claim 17 , wherein said base is made of an elastic sintered ceramic.
21. The head gimbal assembly as claimed in claim 20 , wherein said elastic sintered ceramic is ZrO2.
22. The head gimbal assembly as clam in claim 17 , wherein each of said movable arms comprises an arm member made of an elastic sintered ceramic, and a piezoelectric element formed on a side surface of said arm member.
23. The head gimbal assembly as claimed in claim 22 , wherein said elastic sintered ceramic is ZrO2.
24. The head gimbal assembly as claimed in claim 17 , wherein said movable arms is constituted so that said head slider is linearly and laterally oscillated in response to the drive signal.
25. The head gimbal assembly as claimed in claim 17 , wherein inner corners at coupling sections of said base and said movable arms have an obtuse angle plane shape.
26. The head gimbal assembly as claimed in claim 17 , wherein inner corners at coupling sections of said base and said movable arms have a smooth plane shape.
27. The head gimbal assembly as claimed in claim 16 , wherein said actuator has a rough U-plane shape.
28. The head gimbal assembly as claimed in claim 16 , wherein said actuator has a thickness equal to or less than a thickness of said head slider.
29. The head gimbal assembly as claimed in claim 16 , wherein a spacing between said pair of movable arms is determined to a value slightly shorter than a width of said head slider.
30. The head gimbal assembly as claimed in claim 16 , wherein said at least one head element is at least one thin-film magnetic head element.
31. The head gimbal assembly as claimed in claim 16 , wherein said movable arms of said actuator and said head slider are fixed with an adhesive.
32. The head gimbal assembly as claimed in claim 16 , wherein said actuator and said support are fixed with an adhesive and a solder.
33. A disk drive apparatus having at least one head gimbal assembly that includes a head slider with at least one head element, a support and a precise positioning actuator fixed with said head slider and with said support for precisely positioning said at least one head element, said actuator comprising a pair of movable arms capable of displacing in response to a drive signal applied thereto, said head slider is caught in a space between said movable arms.
34. A manufacturing method of a head gimbal assembly comprising the steps of:
preparing a precise positioning actuator with a pair of movable arms capable of displacing in response to a drive signal applied thereto;
catching a head slider with at least one head element in a space between said movable arms of said actuator; and
fixing said actuator with said caught head slider to said support.
35. The manufacturing method as claimed in claim 34 , wherein said catching step comprises fixing said head slider between said movable arms with an adhesive.
36. The manufacturing method as claimed in claim 35 , wherein a spacing between said pair of movable arms is slightly shorter than a width of said head slider to be caught, and wherein said catching step comprises provisionally fixing said head slider between said movable arms by a pinching force of said movable arms.
37. The manufacturing method as claimed in claim 36 , wherein said catching step comprises securely fixing said head slider to said movable arms by thermally curing the adhesive after the provisional fixing.
38. The manufacturing method as claimed in claim 34 , wherein said fixing step comprises fixing said actuator to said support with an adhesive or a solder.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US10/705,884 US20040095687A1 (en) | 2000-08-24 | 2003-11-13 | Precise positioning actuator for head element, head gimbal assembly with the actuator, disk drive apparatus with the head gimbal assembly and manufacturing method of head gimbal assembly |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000253930A JP3675315B2 (en) | 2000-08-24 | 2000-08-24 | Head gimbal assembly having an actuator for minute positioning of a head element and disk apparatus having the head gimbal assembly |
JP253930/2000 | 2000-08-24 | ||
US09/933,774 US6690551B2 (en) | 2000-08-24 | 2001-08-22 | Precise positioning actuator for head element, head gimbal assembly with the actuator, disk drive apparatus with the head gimbal assembly and manufacturing method of head gimbal assembly |
US10/705,884 US20040095687A1 (en) | 2000-08-24 | 2003-11-13 | Precise positioning actuator for head element, head gimbal assembly with the actuator, disk drive apparatus with the head gimbal assembly and manufacturing method of head gimbal assembly |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US09/933,774 Division US6690551B2 (en) | 2000-08-24 | 2001-08-22 | Precise positioning actuator for head element, head gimbal assembly with the actuator, disk drive apparatus with the head gimbal assembly and manufacturing method of head gimbal assembly |
Publications (1)
Publication Number | Publication Date |
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US20040095687A1 true US20040095687A1 (en) | 2004-05-20 |
Family
ID=18742958
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
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US09/933,774 Expired - Fee Related US6690551B2 (en) | 2000-08-24 | 2001-08-22 | Precise positioning actuator for head element, head gimbal assembly with the actuator, disk drive apparatus with the head gimbal assembly and manufacturing method of head gimbal assembly |
US10/705,885 Expired - Fee Related US6956724B2 (en) | 2000-08-24 | 2003-11-13 | Precise positioning actuator for head element, head gimbal assembly with the actuator, disk drive apparatus with the head gimbal assembly and manufacturing method of head gimbal assembly |
US10/705,884 Abandoned US20040095687A1 (en) | 2000-08-24 | 2003-11-13 | Precise positioning actuator for head element, head gimbal assembly with the actuator, disk drive apparatus with the head gimbal assembly and manufacturing method of head gimbal assembly |
Family Applications Before (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/933,774 Expired - Fee Related US6690551B2 (en) | 2000-08-24 | 2001-08-22 | Precise positioning actuator for head element, head gimbal assembly with the actuator, disk drive apparatus with the head gimbal assembly and manufacturing method of head gimbal assembly |
US10/705,885 Expired - Fee Related US6956724B2 (en) | 2000-08-24 | 2003-11-13 | Precise positioning actuator for head element, head gimbal assembly with the actuator, disk drive apparatus with the head gimbal assembly and manufacturing method of head gimbal assembly |
Country Status (5)
Country | Link |
---|---|
US (3) | US6690551B2 (en) |
JP (1) | JP3675315B2 (en) |
CN (1) | CN1209746C (en) |
HK (1) | HK1045588B (en) |
SG (1) | SG102633A1 (en) |
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Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4128979A (en) * | 1977-05-05 | 1978-12-12 | Price Reginald S | Suspension assembly for partition panel |
US5457075A (en) * | 1993-05-11 | 1995-10-10 | Hitachi Metals, Ltd. | Sintered ceramic composite and molten metal contact member produced therefrom |
US5612841A (en) * | 1993-06-15 | 1997-03-18 | Seagate Technology, Inc. | Flexure assembly for hard disc drive heads |
US5745319A (en) * | 1992-08-12 | 1998-04-28 | Kabushiki Kaisha Toshiba | Recording/reproducing apparatus with coarse and fine head positioning actuators and an elastic head gimbal |
US5864448A (en) * | 1995-10-24 | 1999-01-26 | International Business Machines Corporation | Slider and suspension retention and retraction system for high capacity disk drive |
US6078473A (en) * | 1998-05-13 | 2000-06-20 | Seagate Technology, Inc. | Gimbal flexure for use with microactuator |
US6246552B1 (en) * | 1996-10-31 | 2001-06-12 | Tdk Corporation | Read/write head including displacement generating means that elongates and contracts by inverse piezoelectric effect of electrostrictive effect |
US6351354B1 (en) * | 1999-05-07 | 2002-02-26 | Seagate Technology Llc | Head to flexure interconnection for disc drive microactuator |
US6459548B1 (en) * | 1999-06-03 | 2002-10-01 | Tdk Corporation | Head suspension assembly with flexible air-floating lead |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06309822A (en) | 1992-08-12 | 1994-11-04 | Toshiba Corp | Record reproducing head and record reproducer using this head |
JPH08180623A (en) | 1994-12-22 | 1996-07-12 | Hitachi Ltd | Magnetic disk device |
JP3663321B2 (en) | 1998-08-05 | 2005-06-22 | 株式会社日立グローバルストレージテクノロジーズ | Magnetic disk unit |
WO2000016318A1 (en) | 1998-09-16 | 2000-03-23 | Matsushita Electric Industrial Co., Ltd. | Head support mechanism, information recording / reproducing apparatus, and method of manufacturing head support mechanism |
US6198606B1 (en) * | 1999-07-28 | 2001-03-06 | Seagate Technology Llc | Disc drive actuation system having an injection molded magnetic micro-actuator with metal beam inserts and its method of fabrication |
US6590747B1 (en) * | 1999-08-17 | 2003-07-08 | Seagate Technology, Llc. | Seal for micro-electro-mechanical devices |
WO2003041062A1 (en) * | 2001-11-03 | 2003-05-15 | Sae Magnetics (H.K.) Ltd. | Method and apparatus for improved attachment of a micro-actuator to a slider device |
-
2000
- 2000-08-24 JP JP2000253930A patent/JP3675315B2/en not_active Expired - Fee Related
-
2001
- 2001-08-10 SG SG200104854A patent/SG102633A1/en unknown
- 2001-08-22 US US09/933,774 patent/US6690551B2/en not_active Expired - Fee Related
- 2001-08-24 CN CNB011258128A patent/CN1209746C/en not_active Expired - Fee Related
-
2002
- 2002-09-26 HK HK02107044.9A patent/HK1045588B/en not_active IP Right Cessation
-
2003
- 2003-11-13 US US10/705,885 patent/US6956724B2/en not_active Expired - Fee Related
- 2003-11-13 US US10/705,884 patent/US20040095687A1/en not_active Abandoned
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4128979A (en) * | 1977-05-05 | 1978-12-12 | Price Reginald S | Suspension assembly for partition panel |
US5745319A (en) * | 1992-08-12 | 1998-04-28 | Kabushiki Kaisha Toshiba | Recording/reproducing apparatus with coarse and fine head positioning actuators and an elastic head gimbal |
US5457075A (en) * | 1993-05-11 | 1995-10-10 | Hitachi Metals, Ltd. | Sintered ceramic composite and molten metal contact member produced therefrom |
US5612841A (en) * | 1993-06-15 | 1997-03-18 | Seagate Technology, Inc. | Flexure assembly for hard disc drive heads |
US5864448A (en) * | 1995-10-24 | 1999-01-26 | International Business Machines Corporation | Slider and suspension retention and retraction system for high capacity disk drive |
US6246552B1 (en) * | 1996-10-31 | 2001-06-12 | Tdk Corporation | Read/write head including displacement generating means that elongates and contracts by inverse piezoelectric effect of electrostrictive effect |
US6078473A (en) * | 1998-05-13 | 2000-06-20 | Seagate Technology, Inc. | Gimbal flexure for use with microactuator |
US6351354B1 (en) * | 1999-05-07 | 2002-02-26 | Seagate Technology Llc | Head to flexure interconnection for disc drive microactuator |
US6459548B1 (en) * | 1999-06-03 | 2002-10-01 | Tdk Corporation | Head suspension assembly with flexible air-floating lead |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070064347A1 (en) * | 2005-09-22 | 2007-03-22 | Sae Magnetics (H.K.) Ltd. | Microactuator, head gimbal assembly and hard disk drive using the same, and method of manufacturing microactuator |
US20090080114A1 (en) * | 2007-09-21 | 2009-03-26 | Sae Magnetics (H.K.) Ltd. | Head gimbal assembly, flexible printed cable, head stack assembly, and disk drive unit with the same |
US20100195251A1 (en) * | 2007-10-05 | 2010-08-05 | Toshiba Storage Device Corporation | Micro actuator device, head suspension assembly and storage medium driving device |
US8098461B2 (en) | 2007-10-05 | 2012-01-17 | Toshiba Storage Device Corporation | Micro actuator device, head suspension assembly and storage medium driving device |
US20090284870A1 (en) * | 2008-05-16 | 2009-11-19 | Fujitsu Limited | Head suspension assembly and storage medium drive |
US8675313B2 (en) | 2011-12-28 | 2014-03-18 | Nitto Denko Corporation | Suspension board with circuit |
Also Published As
Publication number | Publication date |
---|---|
US6690551B2 (en) | 2004-02-10 |
US20040095688A1 (en) | 2004-05-20 |
HK1045588B (en) | 2005-10-28 |
CN1209746C (en) | 2005-07-06 |
US6956724B2 (en) | 2005-10-18 |
JP3675315B2 (en) | 2005-07-27 |
CN1347078A (en) | 2002-05-01 |
US20020036870A1 (en) | 2002-03-28 |
JP2002074870A (en) | 2002-03-15 |
HK1045588A1 (en) | 2002-11-29 |
SG102633A1 (en) | 2004-03-26 |
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Legal Events
Date | Code | Title | Description |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |