WO2000016318A1 - Mecanisme de support de tete, appareil d'enregistrement / reproduction d'informations et procede de fabrication d'un mecanisme de support de tete - Google Patents
Mecanisme de support de tete, appareil d'enregistrement / reproduction d'informations et procede de fabrication d'un mecanisme de support de tete Download PDFInfo
- Publication number
- WO2000016318A1 WO2000016318A1 PCT/JP1999/005061 JP9905061W WO0016318A1 WO 2000016318 A1 WO2000016318 A1 WO 2000016318A1 JP 9905061 W JP9905061 W JP 9905061W WO 0016318 A1 WO0016318 A1 WO 0016318A1
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- WO
- WIPO (PCT)
- Prior art keywords
- thin film
- film
- information recording
- head
- reproducing apparatus
- Prior art date
Links
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Classifications
-
- 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
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
- G11B5/3103—Structure or manufacture of integrated heads or heads mechanically assembled and electrically connected to a support or housing
-
- 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
- G11B5/4806—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 specially adapted for disk drive assemblies, e.g. assembly prior to operation, hard or flexible disk drives
- G11B5/4853—Constructional details of the electrical connection between head and arm
-
- 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
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
- G11B5/3163—Fabrication methods or processes specially adapted for a particular head structure, e.g. using base layers for electroplating, using functional layers for masking, using energy or particle beams for shaping the structure or modifying the properties of the basic layers
-
- 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
- G11B5/4806—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 specially adapted for disk drive assemblies, e.g. assembly prior to operation, hard or flexible disk drives
- G11B5/484—Integrated arm assemblies, e.g. formed by material deposition or by etching from single piece of metal or by lamination of materials forming a single arm/suspension/head unit
-
- 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
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
- G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
- G11B2220/2508—Magnetic discs
Definitions
- the present invention relates to a head support mechanism, an information recording / reproducing apparatus using the same, and a method of manufacturing the head support mechanism. More particularly, the present invention relates to a head support mechanism provided with fine movement driving means, an information recording / reproducing apparatus using the same, and a head support. The present invention relates to a mechanism manufacturing method. Background art
- a magnetic disk device as an information recording / reproducing device is used as a main external storage device of a computer by utilizing a large capacity, a high transfer rate, and a high speed random access performance.
- the capacity of magnetic disk drives has been increasing remarkably recently, and the density is increasing at an annual rate of 60%.
- the bit cells recorded on the disk have become finer, and it is necessary to further narrow the track.
- the track pitch at a surface recording density of 20 to 40 G bits / in 2 is expected to require a submicron dimension of 0.35 m or less. Therefore, in order to stabilize the signal at the time of recording / reproducing information in such a narrow track, high precision and high speed tracking control are pursued.
- a general conventional magnetic disk device has a head for recording and reproducing information on a disk medium, a slider for mounting the head, and a head support mechanism for supporting the head via the slider.
- the high-precision tracking corresponding to the sub-micron-order narrow track pitch described above has a limit with this one-stage drive unit, and in addition to the first-stage main drive unit, a second-stage fine drive unit
- Such two-stage control factories include a type that drives a head support mechanism, that is, a suspension, a type that drives a slider, and a type that drives a head element mounted on a slider. Has been devised.
- the role of the head support mechanism of the magnetic disk drive is as follows: the slider, which floats close to the rotating disk, pushes the slider against the disk by staking the force received by the contact; There is a role to follow the swell. For this reason, the head support mechanism is composed of a plurality of members, and individual members play these roles.
- the member with the former role is called a load beam, and the member with the latter role is called a flexure or gimbal (hereinafter referred to as “flexure”).
- Japanese Patent Application Laid-Open No. Hei 9-73 746 describes that fine movement driving means is provided so as to face first and second piezoelectric thin films provided on one surface of a load beam in parallel with each other in the longitudinal direction thereof and the back surface.
- a head support mechanism provided with third and fourth piezoelectric thin films provided is disclosed.
- the piezoelectric thin film is piled with high in-plane stiffness. It has the drawback that it needs to be expanded and contracted (distorted) and requires a high driving applied voltage (for example, 50 V).
- a two-stage control actor mounted on the back of the slider.
- This is a driving method using piezoelectric ceramics as fine movement driving means, and has a laminated structure in order to reduce the driving voltage.
- the drive voltage is reduced by devising a multi-layered structure.
- the lamination surface of the piezoelectric ceramics and the expansion and contraction direction (displacement direction) of the piezoelectric ceramics are aligned, the piezoelectric ceramics expand and contract against high in-plane rigidity. (Distorted) and a relatively high driving applied voltage (for example, 20 V) is disadvantageous as in the conventional example disclosed in Japanese Patent Application Laid-Open No. Hei 9-73746. It is.
- the two-stage control factory is mounted on the back of the slider, the thickness of the magnetic disk drive in the height direction increases, making it unsuitable for reducing the size and thickness of the magnetic disk drive.
- the above-mentioned conventional fine movement driving means requires a high driving applied voltage of the order of several tens of volts.
- the read signal level of the magnetic disk drive is on the order of mV, whereas the drive voltage of the above-mentioned conventional fine drive means is on the order of several tens of volts. I am concerned.
- the present invention has been made to solve the problems of these conventional examples.
- An object of the present invention is to provide a fine drive unit that realizes high-speed and high-accuracy tracking at a practically low drive voltage including ease of manufacture, in response to a narrow track pitch accompanying an increase in surface recording density.
- An object of the present invention is to provide a head support mechanism provided with an information recording / reproducing apparatus using the same and a method of manufacturing the head support mechanism. Disclosure of the invention
- a head support mechanism includes a head and a slider that holds the head, wherein the head is a head support mechanism that is tracked by main driving means,
- the head support mechanism further includes a sub-driving means made of a thin film and finely moving the head, the sub-driving means finely moving the head by using the bending deformation of the thin film, and The above object is achieved.
- the thickness of the thin film may be 10 // m or less.
- the thin film is formed on a base material and has a thickness of 10 or less, and the thin film may be formed on the base material using a film forming process.
- the film forming process may include a direct film forming process.
- the film forming process may include a transfer process.
- the thin film and the slider may be arranged along a tracking direction of the head.
- An information recording / reproducing apparatus includes a head support mechanism including a head and a slider for holding the head, and tracks the head via the head support mechanism.
- An information recording / reproducing apparatus for recording and reproducing information on and from a disk by using the head wherein the head support mechanism is composed of a thin film and comprises sub-drive means for finely moving the head;
- the driving means uses the flexural deformation of the thin film to finely move the head, whereby the object is achieved.
- the thin film may be formed such that the thickness direction substantially matches the tracking direction of the head.
- the thickness of the thin film may be 10 zz m or less.
- a main part of a member constituting the sub-drive means may be arranged in a space within a thickness of the slider in a height direction from a surface of the disk.
- the auxiliary driving means may be arranged near a position in the height direction of the center of gravity of the slider from the surface of the disk.
- the head support mechanism may include a plurality of thin leaf springs formed substantially perpendicular to the surface of the disk.
- the sub-drive means may further include a base material serving as a diaphragm, and the base material may include a spring material.
- the sub-drive means may have any configuration of a piezoelectric system, an electrostatic system, an electromagnetic system, a magnetostrictive system, or a shape memory alloy system.
- the auxiliary sub-drive means may include any of a piezoelectric material, an electrostrictive material, and a magnetostrictive material.
- the head support mechanism includes a first member coupled to the slider, and a second member coupled to the main drive unit, and the sub-drive unit is formed on the first member. No.
- the first member may include a flexure that causes the slider to follow the surface of the disk.
- the first member may further include a thin metal plate, the thin metal plate may have a bent portion formed by bending, and the sub-drive means may be formed in the bent portion.
- the bent portion may be bent in a direction substantially perpendicular to the surface of the disk, and the bent portion may have a grooved portion for improving the bending accuracy. .
- the bending section is formed such that a bending height dimension is smaller than a dimension of the slider in a first direction which is a direction of a rotation axis of the disk, and the sub-drive means in the first direction is formed.
- the dimension may be formed to be smaller than the dimension of the slider in the first direction.
- the head support mechanism further includes a sub-driving means forming member on which the sub-driving means is formed, and the sub-driving means forming member includes a recording / reproducing signal wiring connected to the head. Good.
- the head support mechanism has a plurality of parallel spring portions formed substantially perpendicular to the surface of the disk, and the sub-drive means is formed in the plurality of parallel spring portions,
- the auxiliary driving means may translate the head in the tracking direction.
- the head support mechanism has a plurality of leaf springs arranged radially from a center of rotation, and the sub-drive means is formed on the plurality of leaf springs;
- the slider may be rotated around the center, and the head may be slightly moved in the tracking direction.
- the plurality of leaf springs may include a leaf spring having a longitudinal direction in the tracking direction.
- the plurality of leaf spring portions extend in a direction substantially orthogonal to the tracking direction.
- It may include a leaf spring having a direction.
- the head support mechanism may include a pair of auxiliary driving units.
- the sub-driving means may be arranged so as to be substantially parallel to the arrangement direction of the slider.
- each extension line in the arrangement direction of the sub-drive means has an intersection with the extension line in the arrangement direction of the slider on the tip end side of the head support mechanism. They may be arranged at predetermined angles with respect to the directions.
- the predetermined angle may be 15 degrees or more.
- the head support mechanism further includes a first member coupled to the slider, the sub-drive unit is formed on the first member, and the sub-drive unit is arranged in a direction in which the sub-drive unit is disposed.
- the first member may be arranged such that the center of gravity of the first member exists near each intersection of the extension lines.
- the head support mechanism may include two or more pairs of auxiliary driving means.
- the sub-driving means may be formed using a semiconductor process.
- the sub-driving means may include a restraint relaxing means for restraining at least a part of the thin film.
- the restraint relieving means may include means for reducing the rigidity of the sub-drive means.
- the constraint relaxation means may include a panel structure.
- the restraint relaxing means may include a low rigidity material.
- the restraint relieving means may include a wiring for applying a driving voltage for driving the thin film to the thin film.
- the information recording / reproducing apparatus may further include control means for controlling the main drive means and the sub drive means.
- the thin film may be formed on a base material, and the thin film may be formed on the base material using a film forming process.
- the film forming process may include a direct film forming process.
- the thin film may be formed by sequentially laminating a metal film, an underlayer, a piezoelectric thin film, and a metal electrode film on the base material.
- the thin film may be formed by sequentially laminating an insulating film, a metal film, a base layer, a piezoelectric thin film, and a metal electrode film on the base material.
- the thin film may be formed by sequentially laminating a metal film, an underlayer, a piezoelectric thin film, and a metal electrode film on the base material in a vacuum chamber.
- the thin film may be formed by sequentially laminating an insulating film, a metal film, a base layer, a piezoelectric thin film, and a metal electrode film on the base material in a vacuum chamber.
- the thin film includes a metal film, and the metal film may be formed by a vacuum process or a submerged process.
- the film forming process may include a transfer process.
- the thin film may be formed by sequentially laminating an adhesive, a metal film, a piezoelectric thin film, a base layer, and a metal electrode film on the base material.
- the thin film and the slider may be arranged along a tracking direction of the head.
- the thin film may be formed on the base material such that the thickness direction substantially matches the tracking direction of the head.
- the thin film may be formed on the base material such that the thickness direction is substantially perpendicular to the surface of the disk.
- the base material has elasticity, and the base material has such a thickness that both a bending rigidity required for causing the slider to follow the undulation of the surface of the disk and a displacement required for tracking are obtained. May have.
- the thickness of the base material may be 0.5 or more and 50 or less.
- the base material may be formed of stainless steel.
- the base material may be formed of silicon.
- the thin film includes a piezoelectric thin film, the piezoelectric thin film is formed by an rf sputtering method, an ion beam It may be formed by any of a sputtering method, a sol-gel method, a CVD method, and a laser-ablation method.
- the piezoelectric thin film may include a PZT film.
- the piezoelectric thin film may include a Zn + film.
- the piezoelectric thin film may include a PVDF film.
- the thin film may be formed on both sides of the base material so as to sandwich the base material.
- the thin film includes a piezoelectric thin film, and the whole of the piezoelectric thin film may be covered with an insulating film.
- the insulating film may include a material containing any of polyimide, SAM film, LB film, and nitride as a main component.
- the thin film is disposed on both sides of the head with respect to the tracking direction of the head, and the thin film disposed on one side of the head and the thin film disposed on the other side of the head. Voltages of opposite phases may be applied to the disposed thin film, and the thin films may be radiused in opposite directions.
- the thin film is disposed on both sides of the head with respect to the tracking direction of the head, and the thin film disposed on one side of the head and the other side of the head are disposed on the other side of the head.
- the in-phase voltage may be applied to the disposed thin film, and the thin film may bend in the same direction.
- the thin film may include an underlayer.
- the underlayer may include any of a PT layer, a PLT layer, a PBT03 layer, a 51 "1 ⁇ 03 layer and an 83Ti03 layer.
- the PLT layer may be substantially free of Zr.
- the thin film includes a metal film stacked adjacent to the underlayer, and the metal film may include either a platinum film or a titanium film.
- the base material may have a wiring for applying a voltage to the thin film.
- the wiring may be formed after the thin film is formed on the base material.
- a method for manufacturing a head support mechanism includes a head and a slider for holding the head, wherein the head is a head support mechanism that is tracked by main driving means,
- the head support mechanism is composed of a thin film and is a sub-drive for finely moving the head.
- a method for manufacturing a head supporting mechanism formed on a base material comprising: a first step of forming the thin film on the base material using a film forming process; and a method of forming a slider holding the head on the base material.
- the first step may include a third step of forming the thin film on the base material using a direct film formation process.
- the third step may include a fourth step of sequentially laminating a metal film, a base layer, a piezoelectric thin film, and a metal electrode film on the base material.
- the third step may include a fourth step of sequentially laminating an insulating film, a metal film, a base layer, a piezoelectric thin film, and a metal electrode film on the base material.
- the thin film may include a metal film
- the third step may include a fourth step of forming the metal film by a vacuum process or a submerged process.
- the first step may include a third step of forming the thin film on the base material using a transfer process.
- the third step includes a fourth step of sequentially laminating a metal film, an underlayer, a piezoelectric thin film, a metal electrode film, and an adhesive on a transfer substrate; and a fifth step of attaching the base material on the adhesive. And a sixth step of removing the transfer substrate from the metal film.
- the transfer substrate may be formed of any of MgO, sapphire, strontium titanate, and silicon.
- the base material may be formed of stainless steel.
- the base material may be formed of silicon.
- the thin film includes a piezoelectric thin film
- the first step is to form the piezoelectric thin film by any one of a rf sputtering method, an ion beam sputtering method, a sol-gel method, a CVD method, and a laser-ablation method. It may include a third step.
- the first step may include a third step of forming the thin film on both sides of the base material so as to sandwich the base material.
- the thin film may include a piezoelectric thin film
- the first step may include a third step for forming the piezoelectric thin film.
- the piezoelectric thin film may include a PZT film.
- the piezoelectric thin film may include a ZnO film.
- the piezoelectric thin film may include a PVDF film.
- the thin film may include a piezoelectric thin film
- the first step may include a third step of covering the entire piezoelectric thin film with an insulating film.
- the insulating film may include a material containing any of polyimide, SAM film, LB film, and nitride as a main component.
- the first step may include a third step of forming the thin film on both sides of the mounting position of the head with respect to the tracking direction of the head.
- the thin film may include an underlayer, and the first step may include a third step of forming the underlayer.
- the underlayer may include any of a PT layer, a PLT layer, a PBT03 layer, a 31 ′′ layer and an 83Ti03 layer.
- the PLT layer may be substantially free of Zr.
- the one step includes a fourth step of forming a metal film stacked adjacent to the underlayer, and the metal film may include either a platinum film or a titanium film.
- the method for manufacturing the head support mechanism may further include a third step of forming a wiring for applying a voltage to the thin film on the base material after forming the thin film on the base material.
- FIG. 1 is a perspective view showing a head support mechanism according to Embodiment 1 of the present invention.
- FIG. 2 is a partially enlarged perspective view showing a head support mechanism according to the first embodiment of the present invention.
- FIG. 3 is a diagram showing a magnetic disk drive using the head support mechanism of the present invention.
- FIG. 4 is a longitudinal sectional view of a main part of the magnetic disk drive according to the first embodiment of the present invention.
- FIG. 5 is a partially enlarged perspective view around a slider support member according to the first embodiment.
- FIG. 6A is a partially enlarged perspective view of a slider support member according to the first embodiment.
- FIG. 6B is a partially enlarged perspective view for describing the configuration in the first embodiment.
- FIG. 7A is a partially enlarged plan view for describing an operation in the first embodiment.
- FIG. 7B is a partially enlarged plan view for describing an operation in the first embodiment.
- FIG. 7C is a partially enlarged plan view for describing an operation in the first embodiment.
- FIG. 7D is a perspective view of the head support mechanism 105 after a drive voltage is applied.
- 7E to 7G are explanatory diagrams of the flexural deformation of the thin film.
- FIG. 8 is a partially enlarged perspective view showing a head support mechanism according to the second embodiment.
- FIG. 9 is a partially enlarged perspective view showing a head support mechanism according to the third embodiment.
- FIG. 10 is a partially enlarged perspective view for describing a configuration according to a fourth embodiment.
- FIG. 11 is a partially enlarged perspective view for illustrating a configuration according to a fifth embodiment.
- FIG. 12 is a partially enlarged plan view for describing a configuration according to the fifth embodiment.
- FIG. 13 is a partially enlarged perspective view for describing a configuration according to the fifth embodiment.
- FIG. 14 is a partially enlarged perspective view of another head support mechanism according to the fifth embodiment.
- FIG. 15A is a perspective view of another head support mechanism before a drive voltage is applied in the fifth embodiment.
- FIG. 15B is a perspective view of another head support mechanism after the drive voltage is applied in the fifth embodiment.
- FIG. 16A is a plan view of another head support mechanism before a drive voltage is applied in the fifth embodiment.
- FIGS. 16B and 16C are plan views of another head support mechanism after a drive voltage is applied in the fifth embodiment.
- FIG. 178 to FIG. 17D show the secondary drive using the direct film formation process in the sixth embodiment. Sectional drawing explaining the manufacturing method of a moving means.
- FIG. 18 is a flowchart of a method of manufacturing a head support mechanism in which a sub-drive unit is formed using a direct film forming process according to the sixth embodiment.
- FIG. 198 to FIG. 19F are cross-sectional views illustrating a method of manufacturing a sub-drive means using a transfer process according to the seventh embodiment.
- FIG. 20 is a flowchart of a method for manufacturing a head support mechanism provided with a sub-drive unit using a transfer process according to the seventh embodiment.
- FIG. 21 is a partially enlarged perspective view of a head support mechanism according to the eighth embodiment.
- FIG. 22A is a perspective view for explaining expansion and contraction of a sub-driving means formed on a head support mechanism after application of a driving voltage according to the eighth embodiment.
- FIG. 22B is a perspective view illustrating the translation of the head support mechanism after the application of the drive voltage according to the eighth embodiment.
- FIG. 23A is a perspective view for explaining expansion and contraction of a sub-drive means formed in a head support mechanism after application of a drive voltage according to the eighth embodiment.
- FIG. 23B is an explanatory diagram of a state of the auxiliary driving unit and the flexure before the application of the driving voltage in the eighth embodiment.
- FIG. 23C is an explanatory diagram of the state of the auxiliary driving unit and the flexure after the application of the driving voltage according to the eighth embodiment.
- FIG. 24 is a diagram illustrating a positional relationship between a drive element and a disk surface in an actuator section according to the ninth embodiment.
- FIG. 25 is a diagram showing an angle formed by a drive element in an actuator section in Embodiment 9 and a plane perpendicular to the disk surface.
- FIG. 26A and FIG. 26B are diagrams illustrating the operation of the factories according to the ninth embodiment.
- FIG. 27 is a diagram showing positions constituting the restraint relaxation means of the actuary in the tenth embodiment.
- FIG. 28A is a diagram illustrating an example of a constraint relaxation unit in an embodiment according to the tenth embodiment.
- FIG. 28B is an enlarged view of the restraint alleviating means of the practice of Embodiment 10 according to the tenth embodiment.
- FIG. 29A is a diagram illustrating another example of the restraint alleviating means of Actuyue in Embodiment 10.
- FIG. 29B is a diagram illustrating yet another example of the constraint relaxation means of the actuary in the tenth embodiment.
- FIG. 29C is a diagram illustrating yet another example of the constraint relaxation unit of the actuyue in the tenth embodiment.
- FIG. 29D is a diagram illustrating yet another example of the restraint alleviating means of Actuyue in Embodiment 10.
- FIG. 30 is a diagram illustrating yet another example of the constraint relaxation means of the actuary in the tenth embodiment.
- FIG. 1 shows a perspective view of a head support mechanism according to Embodiment 1 of the present invention.
- FIG. 2 is a partially enlarged perspective view of the head support mechanism according to the first embodiment of the present invention.
- FIG. 3 is a perspective view of a magnetic disk drive using the head support mechanism of the present invention.
- FIG. 4 is a longitudinal sectional view of a main part of a magnetic disk drive using the head support mechanism of the present invention.
- 1 is a head for recording and reproducing information
- 2 is a slider on which the head is mounted
- 3 is a disk which is driven by a motor to rotate and record information
- 4 is a main disk for tracking the head.
- Drive means, 4a constitutes part of this main drive means 5 is a head support mechanism, and 6 is a tracking direction.
- Numeral 1 denotes a spindle motor for rotating the magnetic disk 3, and it is preferable to use a DC brushless motor in terms of high rotation accuracy and reliability.
- 4 is a main drive means for moving the flexure 5b in the radial direction on the surface of the magnetic disk to track the magnetic head 1 at the target track position, and flexure 5b is a flexure 5b.
- the head actuator is fixed to the arm 14 with the fixing member 5d and is rotatably supported on the magnetic disk drive chassis body 16 by a pivot bearing using a pole bearing or the like. Is rotated by a voice coil motor 4b.
- the voice coil motor 4b is controlled by a drive control device (not shown).
- the voice coil motor 4b is made by laminating a metal magnet material such as a rare earth element with high coercive force on an iron plate as a yoke while securing an appropriate gap facing the coil made of polyurethane copper wire. It is composed of a magnet part arranged and fixed on the chassis body 16. Normally, one magnetic disk device is provided with a plurality of magnetic disks 3, sliders 2, and flexures 5b as shown in FIG. 4 to increase the recording capacity. In FIG. 1, the head support mechanism 5 is further composed of two main members.
- a flexure 5b having a sub-fine movement driving means 5a different from the main driving means 4 and having a moderate bending rigidity to allow the slider 2 to follow the undulation of the surface of the disk 3.
- the mouthpiece 5c presses the slider 2 against the surface of the disk 3 with an appropriate force.
- FIG. 1 is a perspective view from the disk surface side, the configuration of the load beam 5c on the slider 2 is hidden by the load beam 5c. It is configured to abut.
- Reference numeral 5d denotes a fixing member for connecting the head support mechanism to the arm 4a constituting the main driving means. 5d is omitted and the open beam 5c is directly joined to the arm 4a May be.
- the flexure 5b is provided with a wiring 5e for driving the sub-fine movement driving means 5a. Although not shown, wiring for connecting the recording / reproducing signal of the head can be provided in the flexure 5b with the same configuration.
- FIG. 2 shows the tip of the flexure 5b constituting the head support mechanism 5.
- the sub-fine movement driving means 5a is composed of a thin film or sheet-like piezoelectric material.
- a unimorph-type piezoelectric actuating function consisting of a flexure base material and a piezoelectric body allows it to flex in the thickness direction of the piezoelectric body and move in the tracking direction 6. It is a thing.
- a pair of sub-fine movement driving means is provided to form a thin plate parallel panel structure.
- the driving means By using the deflection in the thickness direction of the piezoelectric body as the driving means, a large displacement required for tracking can be obtained with low voltage driving.
- the main part of the sub-fine movement driving means 5a is formed in a space within the thickness of the slider 2 in the height direction from the disk surface, the thickness of the disk device does not increase, and the disk device can be reduced in size and thickness.
- the height of the center of gravity 2a of the slider 2 from the disk surface is substantially the same as the height of the sub-fine movement driving means 5a, so that an undesirable bending moment due to driving is generated on the slider. Can be prevented.
- the base material of the flexure 5b may be a thin sheet having elasticity.
- a thin metal sheet for example, a stainless sheet having a thickness of 0.5 m to 50 m is used.
- a thin-film piezoelectric material with a thickness of 10 / m or less, for example, PZT, PLT, PLZT, etc., and a moderate flexural rigidity required for flexure and low voltage required for tracking Driving efficiency that enables a large displacement to be obtained by driving can be achieved.
- a unimorph type ferroelectric device in which a cantilever of 0.25 mm in width and 1 mm in length made of 25 m thick stainless steel and a 3 / im-thick PZT thin-film piezoelectric body and electrodes are formed.
- a displacement of the order of 1 Aim can be obtained with a low voltage drive of 13 V to 13 V.
- the disclosed conventional driving mechanism already described in the section of the prior art cannot drive a displacement of the order of 1 / m at such a low voltage.
- the unimorph type sub-driving means is employed, but the bimorph type sub-driving means may be formed by forming a thin film piezoelectric material on the other surface of the flexure.
- the configuration is complicated and difficult to make.
- the head support mechanism structure provided with the head sub-drive means shown in FIG. 1 or FIG. there is a great manufacturing advantage that it can be manufactured more easily.
- high-speed, high-precision tracking is realized at a practical level, including ease of manufacturing, in response to a narrower track pitch accompanying an increase in surface recording density. It is possible to provide a head support mechanism provided with fine movement driving means and a magnetic disk drive using the same.
- FIGS. 5, 6A, and 6B A modified example of the head support mechanism according to the first embodiment will be described with reference to FIGS. 5, 6A, and 6B.
- the same elements as those of the head support mechanism 5 described above are denoted by the same reference numerals. A detailed description of these will be omitted.
- Reference numeral 1 denotes a magnetic head for recording and reproducing data on a predetermined track on the magnetic disk 3.
- Reference numeral 2 denotes a slider on which the magnetic head 1 is mounted.
- Reference numeral 5b denotes a flexure that allows the attitude change of the slider 2 and elastically supports the slider 2.
- a gimbal portion 5b1 for fixing the slider 2 is provided at one end. It is appropriate that the slider 2 is fixed by bonding.
- the flexure 5b is preferably made of a stainless steel plate for a leaf spring because it can easily and precisely generate a very small positive bias of several grams.
- a pattern wiring for transmitting an electric signal is formed on the flexure 5b. Higher recording density makes magnetic head 1 ⁇ slider 2 smaller In the future, it will be more common to use pattern wiring without lead wires.
- Reference numerals 15a and 15b denote a pair of sub-drive means disposed at positions near both sides of the slider 2 in the radial direction on the magnetic disk surface and fixed to the flexure 5b.
- the sub-drive means 15a and 15b are fixed to a pair of sub-drive means mounting parts 5b3 and 5b4 which are bent substantially at right angles near both sides of the gimbal part 5b1. As shown in FIG.
- the pair of auxiliary drive means mounting portions 5b3 and 5b4 are bent to the side where the slider 2 is mounted on the gimbal portion 5b1, and the bending height dimension of the slider 2 is It is configured to be smaller than the dimension (slider thickness dimension) in the direction of the magnetic disk rotation axis (direction of arrow 2b), and the dimension of the sub-drive means 15a and 15b in the direction of the magnetic disk rotation axis is the slider. It is configured to be smaller than the dimension (slider thickness dimension) of 2 in the same direction.
- the bending height dimension of the sub-drive means mounting part is h4
- the slider thickness dimension is h3
- the dimension of the sub-drive means in the magnetic disk rotation axis direction is h7
- the attitude of the slider 2 in the magnetic disk rotation axis direction Assuming that the amount of change is A h, the respective positional relationships are expressed by (Equation 1) and (Equation 2).
- the reason why the slider 2 is bent to the side to be attached to the gimbal part 51 is to prevent the pattern wiring part formed on the flexure 5 b from being damaged by bending, as shown in FIG. This is to increase the mounting density of disposing the essential components in the narrow space between the magnetic disks.
- the method of fixing the sub-drive means 15a and 15b is preferably adhesion or film formation.
- the sub-drive means 15a and 15b are arranged so as to be parallel to the arrangement direction of the slider 2 (the direction of arrow 2C).
- the sub-drive means 15a and 15b are fixedly arranged on the flexure 5b before bending beforehand, and then a method of bending almost at right angles is adopted. It is preferable from the viewpoint of ensuring assembly accuracy and rationalizing man-hours. This is because the sub-drive means 15a and 15b can be arranged and fixed in the same step as the arrangement and fixation of the slider 2, and the mounting accuracy can be increased. For this purpose, as shown in Fig.
- the slider 2 stably flies at a predetermined height from the surface of the magnetic disk by the action of the air flow generated by the magnetic disk 3 rotated in the direction A1 by the spindle motor 11 in the illustrated direction.
- the flexure 5b allows various attitude changes of the slider 2 and maintains a stable floating state.
- the main driving means 4 causes the magnetic head 1 to track so as to be positioned at the target truck position. Further, the magnetic head 1 feeds back the track position data in that state to a drive control device (not shown), and finely adjusts the movement of the magnetic head 1 moved by the main driving means 4 to the auxiliary driving means 1. This is done by 5a and 15b.
- FIG. 7A shows a plan view of the head support mechanism 105 before the drive voltage is applied.
- FIGS. 7B and 7C are plan views of the head support mechanism 105 after the application of the driving voltage.
- FIG. 7D is a perspective view of the head support mechanism 105 after the application of the driving voltage.
- 7E to 7G show explanatory diagrams of the flexural deformation of the thin film. The same elements as those described in FIG. 6A are denoted by the same reference numerals. A detailed description of these will be omitted.
- FIGS. 7E to 7G show the deflection of the thin film in the one-end fixed-end other-end free-end model.
- FIGS. 7F and 7G show the deflection of the thin film in the model with one fixed end and one simple support end.
- the head support mechanism of the present invention includes: A sub-driving means which is made of a thin film and finely moves the head is provided, and the sub-driving means finely moves the head by utilizing the bending deformation of the thin film.
- the bending deformation of the thin film is the bending in the direction substantially perpendicular to the longitudinal direction of the thin film (5 V and the longitudinal direction of the thin film). And substantially parallel deflection ⁇ 5 H1.
- the bending deformation of the thin film is the bending in the direction substantially parallel to the longitudinal direction of the thin film in the one-end fixed-end and the other-side simple supporting-end model. Further included.
- FIG. 7A shows a state in which when the driving voltage is not applied to the sub-drive means 15a and 15b, the sub-drive means 15a and 15b do not expand and contract, and the head 1 does not move slightly.
- the sub-drive means 15a, 15b extend such that the sub-drive means 15a extends in the direction of arrow DD and the sub-drive means 15b contracts in the direction of arrow FF.
- a drive voltage is applied to each of the above will be described.
- the bent portion 5b3 bends in the direction of arrow B.
- the bent part 5b4 also bends in the direction of arrow B in the same manner as the bent part 5b3. Therefore, the tip of the flexure 105 b translates in the direction of arrow B.
- the slider 2 and the head on the flexure 105 b translate in the direction of arrow B.
- the component density of the flexure on which the pattern wiring portion is formed is formed by extremely simple sheet metal processing, thereby increasing the mounting density of element components in a narrow configuration space between magnetic disks.
- further fine movement adjustment of the moved magnetic head can be performed instantaneously in the vicinity of the magnetic head. Stable and high-speed on-track control of the magnetic head can be realized.
- FIG. 8 is a partially enlarged perspective view of the head support mechanism 205 according to Embodiment 2 of the present invention. Most of the components and their reference numerals are the same as those described in the first embodiment, and a detailed description of overlapping contents will be omitted.
- the flexure 205b of the head support mechanism in the second embodiment is different from the one in the first embodiment in that the structure of the first embodiment is a two parallel thin plate spring structure. It is what it was.
- Two of the three parallel thin panel panels are provided with a sub-fine movement driving means 5a for the head as in the first embodiment, but the other thin panel panel has a head 1 for recording.
- the recording / reproducing signal wiring 5 f for extracting the reproducing signal to the outside is formed.
- the rigidity in the lateral direction which is a little problem with the parallel panel mechanism, can be adjusted to a desired rigidity by configuring a plurality of parallel thin panel panels.
- three parallel thin plate spring structures have been described.
- the present invention may of course have a greater number of parallel thin plate spring structures than four or five.
- FIG. 9 is a partially enlarged perspective view of the head support mechanism 300 according to Embodiment 3 of the present invention.
- the auxiliary head driving means 5a provided in the flexure 300b of the head support mechanism according to the third embodiment is configured such that the height of the slider 2 from the disk is centered around the center of gravity 2a of the slider 2. It rotates around the Z-axis in the vertical direction.
- the rotation axis Z is located at a distance d from the center of gravity 2a of the slider.
- the alternative rotation direction 7 is illustrated.
- the head 1 provided on the rear end face of the slider is finely moved in the tracking direction 6 by the rotation of the slider about the Z axis.
- a slight amount of azimuth angle change of the head occurs due to tracking.However, the reduction of the recording / reproducing signal due to this azimuth angle change, that is, azimuth loss can be ignored practically, so this rotary drive method has been applied. I do.
- Fig. 9 three thin panel panels are formed in a T-shape radially around the Z-axis.
- the Z axis is located at a distance d close to the center of gravity 2a of the slider.
- Two of the three thin plates were provided with sub-fine movement driving means 5a, and the other thin panel was provided with signal wiring 5f for recording / reproducing signals.
- the long direction of the thin panel is almost aligned with the tracking direction 6, so the slide can be supported with high rigidity in the longitudinal direction of the thin panel. Lateral rigidity of the mechanism can be significantly increased.
- one thin plate spring constitutes the longitudinal direction of the thin panel in a direction substantially perpendicular to the tracking direction 6, the rigidity in the direction perpendicular to the tracking direction, that is, the longitudinal direction of the head support mechanism is markedly increased. Can be increased.
- the rotational inertia of the slider to be rotationally driven can be reduced, enabling high-speed tracking control and resonance of the head support mechanism.
- the frequency can be increased to improve the characteristics of high-speed, high-accuracy tracking control.
- the fine movement driving means of the head is composed of a plurality of panel structures radially formed from a substantially rotation center.
- Various configurations other than the T-shaped configuration are possible as long as the head is finely moved in the tracking direction by rotating the slider on which the head is mounted at the rotation center by the fine movement means. That is, in principle, three configurations such as T-shape and Y-shape, four configurations such as cross-shape and X-shape, and more configurations such as ⁇ -shape and * -shape are possible.
- FIG. 10 is a partially enlarged perspective view of a flexure 405b constituting a head support mechanism 405 according to Embodiment 4 of the present invention.
- the same components as in Embodiment 1 (FIG. 6A) are denoted by the same reference numerals. A detailed description of these will be omitted.
- FIG. 6A is different from the configuration of FIG. 6A in that the extension lines of the sub-drive means 15a and 15b in the direction in which the sub-drive means 15a and 15b are Are arranged at a predetermined angle, each having an intersection on the tip side.
- one embodiment is an arrangement in which the width of the flexure 405b is symmetrical toward the slider 2 and becomes smaller toward the tip.
- the sub-drives arranged at predetermined angles each having an intersection with the extension of the arrangement direction with respect to the arrangement direction of the slider 2 at the tip end side of the flexure 405 b are provided.
- the rigidity of the slider support member in the radial direction of the magnetic disk (the direction indicated by arrow 6 in the drawing) can be increased by the vector dispersion compared to the parallel plate structure. This enables instantaneous fine movement adjustment of the moved magnetic head, enabling stable and high-speed on-track control of the magnetic head even in sub-micron-order narrow track pitches. Can be realized.
- FIG. 11 is a partially enlarged perspective view of flexure 505b constituting head support mechanism 505 according to Embodiment 5 of the present invention.
- the same components as in Embodiment 4 (FIG. 10) are denoted by the same reference numerals. A detailed description of these will be omitted.
- the difference from the configuration of FIG. 10 is that the auxiliary driving means 15a, 15b are arranged such that the center of gravity G of the flexure 505b exists near the intersection of the extension lines of the auxiliary driving means 15a, 15b. This is the point where b is placed.
- FIG. 12 is a partially enlarged plan view of flexure 505b according to Embodiment 5 of the present invention, where G is the center of gravity of flexure 505b. As shown in Fig. 12, a triangle (dashed line in the figure) connecting G, J and K is formed.
- the auxiliary driving means 15a and 15b are arranged such that the center of gravity G of the flexure 505b exists near the intersection of the extension lines in the arrangement direction.
- a mechanical external force acting in the radial direction of the magnetic disk of the flexure 505b which exerts a bad influence on the drive control, which acts on the center of gravity of the flexure 505b
- the flexure 505b can have a very high rigidity in the radial direction of the magnetic disk. Further fine movement adjustment of the head can be performed instantaneously, and stable and high-speed on-track control of the magnetic head can be realized even at a narrow track pitch of the order of submicron.
- the center of gravity by expanding and extending the shape of the flexure 505b to the tip end as shown in FIG. 11 is shown.
- the auxiliary drive means 15 a By moving the arrangement position to the tip, the auxiliary drive means 15 a, The flexures may be arranged so that the center of gravity of the flexure exists near the intersection of the extension lines in the 15b arrangement direction.
- auxiliary driving means 15a and 15b are arranged on the flexure.
- two or more auxiliary driving means 15a and 15b are used to increase the driving force and the driving amount.
- Means shown 15c, 15d may be provided.
- FIG. 15A is a perspective view of the head support mechanism 705 before the drive voltage is applied.
- FIG. 15B is a perspective view of the head support mechanism 705 after the application of the driving voltage.
- FIG. 16A shows a plan view of the head support mechanism 705 before the drive voltage is applied.
- FIG. 16B and FIG. 16C show plan views of the head support mechanism 705 after the application of the driving voltage.
- the same elements as those described in the fourth embodiment (FIG. 10) are denoted by the same reference numerals. A detailed description of these will be omitted.
- Figures 15A and 16A show that when the driving voltage is not applied to the sub-drive means 15a to 15d, the sub-drive means 15a to 15d does not expand and contract, 1 indicates a state where there is no slight movement.
- the sub-drive means 15a extends in the direction of arrow DD
- the sub-drive means 15c contracts in the direction of arrow GG
- the sub-drive means 15d An example in which a drive voltage is applied to each of the sub-drive units 15a to 15d such that the sub-drive unit 15b expands in the direction and the sub-drive unit 15b contracts in the direction of the arrow FF will be described. Due to the extension of the sub-drive means 15a and the compression of the sub-drive means 15c, the bent portion 4a bends in the direction of arrow C1.
- the bent portion 4b Due to the extension of the sub-drive means 15d and the compression of the sub-drive means 15b, the bent portion 4b also bends in the direction of arrow C1 similarly to the bent portion 4a. Therefore, the tip of the flexure 14 translates in the direction of arrow C1. As a result, the slider 2 and the head on the flexure 4 translate in the direction of arrow C1.
- the base material of the flexure 4 may be an elastic thin plate, but preferably a metal thin plate, for example, a stainless steel sheet having a thickness of 0.5 to 50 m, and a thin film having a film pressure of 10 m or less is further formed thereon.
- a piezoelectric body for example, a thin-film piezoelectric body such as PZT, PLT, and PLZT, and electrodes, the appropriate flexural rigidity required for flexure 14 and the large displacement required for tracking with low voltage drive are achieved. It is possible to achieve both the obtained driving efficiency.
- the flexure 4 is provided with bending portions 4a and 4b, and the auxiliary driving means 15a to 15l are provided. 5d is formed, and the tip of the flexure 14 has a thin plate parallel spring structure.
- the head 1 Since the head 1 is finely moved using the deflection in the thickness direction (arrow C1 or C2) of the sub-drive means, a large displacement required for tracking can be obtained with low-voltage drive.
- a Doppler displacement meter that a translational movement of 2.2 im is performed by applying a driving voltage of 6 V.
- the drive mechanism described in the prior art cannot drive a displacement on the order of 1 / zm at such a low voltage.
- FIG. D shows a cross-sectional view for explaining a method of manufacturing the sub-drive means using the direct film formation process.
- FIG. 18 shows a flowchart of a method for manufacturing a head support mechanism in which sub-drive means is formed using a direct film formation process.
- a base material 12 having a thickness of 0.5 m to 50 / m is formed (FIG. 17A).
- the base material 16A corresponds to the bent portion 4a formed on the flexure 14 shown in FIG. 4A.
- Base material 12 is SUS (stainless steel) In the case of (less), the outer shape is cut out by etching, laser processing, or pressing, and then press forming.
- a Pt film 14 is formed on the base material 12 by direct vacuum deposition using platinum (Pt) spatter (FIG. 17B, S61).
- the Pt film 14 may be formed by growing a plating film in a liquid. Also, by using a shadow mask method or a lift-off method, a piezoelectric thin film such as PZT or Zn ⁇ , which will be described later, can be grown on the part to be grown by rf sputtering, ion beam sputtering, sol-gel method, CVD method, laser ablation method, etc. Only! The 3 t film 14 may be formed. Alternatively, the Pt film 14 may be directly deposited on the base material 12 formed of SUS.
- a PZT film 15A is grown on the Pt film 14 by the rf sputtering method, but a PLT film 15B containing no or a small amount of Zr is grown on the underlayer of the PZT film 15A.
- a PZT film 15A with good characteristics can be formed by using this as the underlying layer (Fig. 17C, S62, S63).
- the total film thickness (Ptl4, PLT15B, PZT15A, Pt16) excluding the base material 12 does not exceed 10 m.
- the head support mechanism is completed.
- the material of the base material 12 is SUS (stainless steel)
- SUS stainless steel
- PLT 15 B, PZT 15 A, and Pt 16 may be finished, followed by etching, laser processing or pressing to pattern the base material 12 made of SUS.
- the base material 12 is not limited to SUS; it is a silicon (Si) semiconductor wafer that can be mass-produced at low cost. It doesn't matter.
- a bimorph type suspension having a function as shown in FIG. 14 can be manufactured.
- a part of the flexure 14, which is a base material made of SUS, is bent at right angles so as to sandwich the slider 2, thereby forming bent portions 4a and 4b.
- Sub-driving means 15c and 15d are also formed on the opposite side (back side) to the slider 2 with respect to the bent portions 4a and 4b.
- the sub-driving means 15c and 15d formed on the back side are also formed from the back side of the base material 12 by the above-described direct film formation process.
- the head support mechanism 705 including the flexure 4 (SUS substrate) having the bent portions 4a and 4b is a head support mechanism having fine movement driving means having a thin parallel panel structure.
- the experimental results show that the head translates about 1 at an applied voltage of 5 V.
- the Pt film 14 used as the base of the piezoelectric thin film 15 can be replaced with a metal material such as titanium (Ti).
- PZT15A and PLT15B can be replaced by zinc oxide (Z ⁇ ), polyvinylidene fluoride (PVDF), or a combination of these.
- the PT film 14 may be formed on the insulating film.
- SiN can be used as the insulating film.
- SiN can be deposited on the base material 12.
- the piezoelectric thin film 15 When the piezoelectric thin film 15 is covered with an insulating film such as polyimide and baked, the piezoelectric thin film 15 is insulated from Pt 14 and also has improved mechanical properties such as close contact with the base material 12.
- an insulating film such as polyimide and baked, the piezoelectric thin film 15 is insulated from Pt 14 and also has improved mechanical properties such as close contact with the base material 12.
- a SAM film, an LB film, a material mainly containing nitride, or the like may be used.
- the respective films forming the sub-driving means are all formed by using a vacuum chamber process. Each film can be formed by using a submerged process.
- high-speed, high-precision tracking can be performed by direct film formation process in response to the narrow track pitch accompanying the increase in areal recording density. It is possible to provide a head support mechanism provided with fine movement driving means that can be realized at a practically low drive voltage including easiness, an information recording / reproducing apparatus using the same, and a method of manufacturing the head support mechanism.
- the head support mechanism can be batch-produced in a batch process, so that an inexpensive head support mechanism can be realized.
- F shows a sectional view for explaining a method of manufacturing the sub-drive means using the transfer process.
- FIG. 20 shows a flowchart of a method for manufacturing a head support mechanism provided with sub-drive means using a transfer process. Even if a transfer process is used, a head support mechanism provided with a sub-drive means (fine movement drive means) can be manufactured.
- a magnesium oxide (MGO) substrate 9 is formed (FIG. 19A).
- the Pt electrode film 16 is formed on the MGO substrate 9 by Pt sputtering (FIG. 19B, S81).
- Pt film 1 such as PZT or Z ⁇ only by the shadow mask method or lift-off method
- a platinum film 14 are grown (FIGS. 19C, 19D, S82, S83). At this time, it is desirable that the film thickness does not exceed 10 m.
- An adhesive is applied on the platinum film 14, and thereafter, a SUS (stainless steel) substrate 12 having a thickness of 0.5 // 11 or more and 501 or less or a substrate having a basic structure of Si is adhered as a base material ( (Fig. 19E, S84, S85).
- the SUS (stainless) substrate 12 or the substrate having a basic structure of Si corresponds to the bent portion 4a formed in the flexure 14 shown in FIG. 4A.
- the MgO substrate 9 is removed by wet etching (FIG. 19F, S86), and the flexure 14 having the auxiliary driving means 15a is completed.
- the finished product of the flexure having the auxiliary driving means manufactured by the transfer process is basically the same as the finished product of the flexure having the auxiliary driving means manufactured by the direct film forming process.
- the PZT piezoelectric thin film can be a film having good characteristics. Almost the same characteristics can be obtained by using a PT film, a PBT i03 film, a SrTi03 film, a BaTi03 film, etc. in addition to the PLT film.
- transfer can also be performed by using a single crystal substrate such as sapphire (crystal A1203) or strontium titanate, or a silicon single crystal substrate.
- the piezoelectric thin films 15 such as two are formed at a high temperature close to 600 ° C., it is better to fabricate the wiring 8 necessary for applying the voltage to the sub-driving means afterwards without exposing the wiring itself to high temperature.
- One-function suspension can flow into the process.
- the seventh embodiment by using the transfer process, high-speed, high-precision tracking, including ease of manufacturing, can be performed in response to the narrower track pitch accompanying the increase in surface recording density. It is possible to provide a head support mechanism provided with a fine movement driving means that can be realized at a practically low driving voltage, an information recording / reproducing apparatus using the same, and a method of manufacturing the head support mechanism.
- the head support mechanism can be batch-manufactured by the batch process as in the case of using the direct film formation process, so that an inexpensive head support mechanism can be realized.
- FIG. 21 is a partially enlarged perspective view of the head support mechanism according to the eighth embodiment.
- the same elements as those described with reference to FIG. are doing. A detailed description of these will be omitted.
- auxiliary driving means 15 a and 15 b This is a point formed on the flexure 14 such that its thickness direction (the direction of the arrow QQ) is substantially perpendicular to the surface of the magnetic disk.
- FIG. 22 is a perspective view illustrating expansion and contraction of the sub-drive means 15a and 15b formed in the head support mechanism 800 after the application of the drive voltage.
- FIG. 22 is a perspective view illustrating the translation of the head support mechanism 800 after the application of the drive voltage.
- sub-drive means 15 a and 15 b expand and contract in the opposite phase
- sub-drive means 15 a contracts in the direction of arrow DD
- sub-drive means 1 5b extends in the direction of arrow FF.
- the auxiliary driving means 15 a and the auxiliary driving means 15 a are so set that the absolute value of the driving voltage to the auxiliary driving means 15 b is sufficiently larger than the absolute value of the driving voltage to the auxiliary driving means 15 a.
- the flexure 14 on the side where the sub-drive means 15b is formed bends sufficiently in the direction of arrow R1 to form the sub-drive means 15a.
- the flexure 14 on the cut side flexes slightly in the direction of arrow R2.
- the sub-drive means 15a and 15b By applying the drive voltage, it is possible to perform a highly accurate and efficient minute displacement of the head for tracking.
- FIG. 23A is a perspective view for explaining expansion and contraction of the sub-drive means 15a and 15b formed in the head support mechanism 800 after the application of the drive voltage.
- FIG. 23B is an explanatory diagram of a state of the auxiliary driving means 15b and the flexure 14 before the application of the driving voltage.
- FIG. 23C is an explanatory diagram of the state of the auxiliary driving means 15b and the flexure 14 after the application of the driving voltage.
- the head support mechanism 800 when the head support mechanism 800 is driven according to the above driving principle, the head support mechanism 800 can be used as a head loading / unloading mechanism, and an accident such as a head crash occurs. Can also be prevented.
- FIG. 24A shows the basic configuration of a three-electrode, two-stage actuator according to the ninth embodiment.
- the head support mechanism is equipped with a head element 1, a slider 2 that flies or slides on a rotating or running recording medium and a suspension 3 that supports it, a flexure 4 that fixes a suspension 3, and a head element. 1 and a signal system (not shown) for electrically connecting the recording / reproducing circuit of the information recording device, and a part or whole thereof is integrally formed. Directly or indirectly to signal leads or suspension Wired by a printed circuit.
- the micro drive is integrated with the suspension 3 and is arranged between the slider 2 and the flexure 4 that constitute the head element 1.
- Figure 24B shows the basic configuration of a five-electrode two-stage type actuator.
- this actuator is composed of a stainless steel of about 15 to 20 / X m as a base material and a piezoelectric thin film constituting the sub-drive means 15a and 15b.
- the sub-drive means 15a and 16b are bent so as to be perpendicular to the disk surface 7.
- the sub-drive means 15a and 15b are each formed at an angle of 15 degrees or more with the surface 9 perpendicular to the disk surface.
- the sub-drive means 15a and 15b are supplied with a drive voltage of 90 degrees opposite phase, and the expansion and contraction are repeated.
- the slider 2 and the head element 1 fixed to the suspension 3 and the suspension 3 by expansion and contraction rotate as shown in Fig. 26A.
- the driving voltage is further reversed, the slider 2 and the head element 1 fixed to the suspension 3 rotate in opposite directions as shown in FIG. 26B.
- the sub-drive means 15a and 15b are arranged at an angle of about 15 degrees or more with respect to a plane 9 perpendicular to the disk surface. This is because when the angle is small (less than about 0 to 15 degrees), the influence of the rotation of the disk on the slider 2 (air viscous frictional force) is easily received, so that this effect is reduced. With the above configuration, highly accurate track positioning becomes possible.
- stainless steel was used as the base material of the actuator, but any material may be used as long as it has the properties of paneling and heat resistance and can secure a certain degree of rigidity even if it is thin.
- FIG. 27 shows the configuration of the two-stage type actuator according to the fourth embodiment.
- Figure 27 shows the restraint relief means provided on the sub-drive means 15a and 15b, which are located at Yakuchi Yue. Indicates 80.
- the restraint relaxation means may be provided at both ends as shown in the figure, or may be provided only on one side.
- the sub-drive means 15a, 15b is about 14 which is the distance that can be changed independently (cantilever beam shape).
- the cause is a loss that occurs because one set of sub-driving means is fixed at both ends of the element. Therefore, by providing the restraint relaxation means 80 at both ends of the sub-drive means 15a and 15b, the force generated by each drive element can be efficiently applied to the suspension 3 and the slider 2 fixed to the suspension 3 and the head element 1. It is possible to communicate and a large displacement can be obtained.
- the restraint on the sub-drive means 15a and 15b may be minimized.
- a method of reducing the rigidity at both ends of the sub-drive means 15a and 15b and a method of providing a panel mechanism at both ends of the sub-drive means 15a and 15b can be considered.
- FIG. 28A shows a method of reducing the rigidity at both ends of the sub-drive means 15a and 15b.
- Fig. 28B shows an enlarged view of the restraint relaxation means 80.
- the thickness of both ends of the stainless steel as the base material forming the sub-drive means 15a and 15b is reduced. As shown in FIG. 28B, by locally reducing the thickness, the rigidity of the thinned portion 8OA decreases, and the fixing portions of the sub-drive means 15a and 15b are easily curved.
- the thinned portion 8OA relaxes the restraining force received by the sub-drive means 15a and 15b, and the suspension 3 and the suspension 3 It is possible to efficiently transmit to the slider 2 and the head element 1 which are fixed to the head.
- stainless steel was used as the base material for the factory, but it possessed spring properties and heat resistance, and even if it was thin, it had some rigidity. Any material can be used as long as it can secure the properties. It should be noted that the structure shown in FIGS. 28A and 28B does not need to be provided at both ends of the sub-drive means 15a and 15b, but it is possible to ease the restraint even if it is provided at only one end.
- both ends 80B of the sub-drive means 15a and 15b are locally applied. Either make it thin, form a triangular portion 80 C with a tapered end, or make a hole 80 D that is punched out.
- the rigidity of the sub-drive means 15a, 15b is locally reduced, the restraint is relaxed, and the displacement is efficiently transmitted to the suspension 3, the slider 2 fixed to the suspension 3, and the head element 1.
- the structure shown in Fig. 29A, Fig. 29B, and Fig. 29C can ease the restraint even if it is provided at only one end, not at both ends of the sub-drive means 15a, 15b. It is. However, it is preferable to provide at both ends.
- the fixing portions of the sub-drive means 15a and 15 are connected to the sub-drive means 15a and 1b.
- 5 Change the material to a material 80 E (a material possessing flexibility) that is less rigid than the base material of b.
- any flexible material such as polymid (Kapton type), polyester, polysulfone, or polytetrafluoroethylene may be used.
- the head support mechanism when the head support mechanism is composed of two main members, that is, the head support mechanism is provided with a sub-fine movement driving means different from the main driving means,
- the flexure had a moderate bending rigidity so that the slider could follow the undulation of the disk surface, and a load beam that pressed the slider against the disk surface with an appropriate force.
- the head supporting mechanism includes at least a first member coupled to a slider mounting a head, and a second member coupled to a tracking main driving unit.
- Various configurations may be considered as long as the configuration is made up of a plurality of members including the second member, and the fine movement driving means of the head is configured as the first member. Of course.
- the sub-fine movement driving means and the driving wiring are provided before the bending is performed.
- the configuration in which the function such as signal wiring is applied to one surface of the base material is described. This has a great advantage in manufacturing that the process surface can be limited to one in manufacturing the head support mechanism of the present invention. However, as shown in FIG. 14, this does not impede the configuration for energizing some or all of these functions on both surfaces of the base material.
- the slider is described as stably flying at a predetermined height from the surface of the magnetic disk due to the effect of the airflow generated by the magnetic disk.
- the embodiment of the present invention also includes a method in which a part of the end of the magnetic head of the slider is brought into contact with the magnetic disk.
- the magnetic disk device has been described as an example, but the present invention is not limited to this.
- an information recording device having an improved STM or AFM can also form a two-stage servo actuator, and can obtain the same effects as those of the present embodiment. it can.
- the tracking of the magnetic disk device has been described as an example, but the present invention is not limited to this.
- the present invention can be used for driving various factories. Further, the present invention can be applied to all devices that store information on a rotating disk surface, such as an optical disk device, a magneto-optical storage device, and a phase-change optical disk device.
- the stainless steel substrate was previously etched into the shape of the actuator, and electrodes and piezoelectric thin films were formed thereon. Folding of sub-drive means The bending was performed by pressing using a mold. Thereafter, the flexible substrate for wiring and the sub-drive means were electrically connected by wire-bonding.
- the head support mechanism was constructed by combining the slider, base plate and open beam.
- Actu-Yuyue which constituted the restraint relaxation means, and measured the displacement.
- the basic configuration of the actuator is that the angle between the sub-drive means and the surface perpendicular to the disk is 60 degrees each, the thickness of stainless steel is 20 // m, and the thickness of the piezoelectric thin film is 2.5 im. did.
- Fig. 28A and Fig. 28B As a means of relaxing the restraint, first as a means to reduce the rigidity, see Fig. 28A and Fig. 28B. As shown, the thickness of both ends of the stainless steel base material forming the drive element portion was reduced to ease the restraint. As a method, a wet etching method was used. In the measurement, the displacement was measured using the laser-Doppler method.
- Example 2 As a third experiment, as in Example 2, an actuary composed of restraint relaxation means was prepared, and the displacement was measured.
- the basic configuration of the actuator was that the angle between the sub-drive means and the surface perpendicular to the disk was 60 degrees, the thickness of stainless steel was 20 m, and the thickness of the piezoelectric thin film was 2.5 zm.
- one side of the stainless steel forming the drive element section was narrowed to a triangular shape to ease the restraint.
- a wet etching method was used.
- the displacement was measured using the laser Doppler method. As a result, the displacement was increased about 1.8 times in the case of the triangular shape as compared with the rectangular drive element.
- Example 4 As a fourth experiment, we made an actuary composed of restraint relaxation means and measured the displacement.
- the basic configuration of the actuator was that the angle between the sub-drive means and the surface perpendicular to the disk was 60 degrees, the thickness of stainless steel was 20 nm, and the thickness of the piezoelectric thin film was 2.5 // m.
- the fixing part of the sub-drive means was made of Polyimide (Kapton), which is a material that is weaker in synthesis than the base material of the sub-drive means.
- the thickness of the polyimide was 1 2 / im.
- An adhesive was used to join the polyimide and the base material (stainless steel) of the auxiliary drive means.
- the displacement was measured using the laser Doppler method. As a result, about 1.9 times the displacement was obtained compared to the case where the fixing part of the sub-drive means was not made of a weakly synthesized material.
- the sub-drive means is bent almost 90 degrees with respect to the disk surface without folds.
- the electrode of the sub-drive means could be taken out to the surface rotated 90 degrees without breaking because it was bent little by little even after bending.
- the displacement was measured using the laser-Doppler method. As a result, about 3.1 times displacement was obtained compared to the one without the restraint relaxation mechanism.
- the restraint relaxation mechanism is not provided at both ends of the sub-drive means but at one end on the slider fixed side. And the same measurement was performed. As a result, compared to the case without the restraint relaxation mechanism,
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Supporting Of Heads In Record-Carrier Devices (AREA)
- Moving Of The Head To Find And Align With The Track (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000570774A JP4387596B2 (ja) | 1998-09-16 | 1999-09-16 | 情報記録再生装置 |
US09/787,480 US6943990B1 (en) | 1998-09-16 | 1999-09-16 | Head support mechanism, information recording/reproducing apparatus, and method of manufacturing head support mechanism |
KR1020017003471A KR20010075186A (ko) | 1998-09-16 | 1999-09-16 | 헤드 지지 기구, 그것을 사용한 정보 기록/재생 장치, 및헤드 지지 기구의 제조 방법 |
EP99943376A EP1152401A4 (en) | 1998-09-16 | 1999-09-16 | HEAD SUPPORT MECHANISM, INFORMATION RECORDING / REPRODUCING APPARATUS, AND METHOD FOR MANUFACTURING A HEAD SUPPORT MECHANISM |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP26114798 | 1998-09-16 | ||
JP10/261147 | 1998-09-16 | ||
JP10/334802 | 1998-11-25 | ||
JP33480298 | 1998-11-25 | ||
JP5201599 | 1999-02-26 | ||
JP11/52015 | 1999-02-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000016318A1 true WO2000016318A1 (fr) | 2000-03-23 |
Family
ID=27294518
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1999/005061 WO2000016318A1 (fr) | 1998-09-16 | 1999-09-16 | Mecanisme de support de tete, appareil d'enregistrement / reproduction d'informations et procede de fabrication d'un mecanisme de support de tete |
Country Status (6)
Country | Link |
---|---|
US (1) | US6943990B1 (ja) |
EP (1) | EP1152401A4 (ja) |
JP (1) | JP4387596B2 (ja) |
KR (1) | KR20010075186A (ja) |
CN (1) | CN1333386C (ja) |
WO (1) | WO2000016318A1 (ja) |
Cited By (9)
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EP1225644A2 (en) * | 2001-01-18 | 2002-07-24 | Ngk Insulators, Ltd. | Piezoelectric/electrostrictive device and method of producing the same |
JP2003208770A (ja) * | 2000-07-04 | 2003-07-25 | Matsushita Electric Ind Co Ltd | ヘッドアクチュエータおよびこれを用いたハードディスクドライブ |
US6956724B2 (en) | 2000-08-24 | 2005-10-18 | Tdk Corporation | 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 |
JP2007179726A (ja) * | 2005-12-28 | 2007-07-12 | Shinka Jitsugyo Kk | ヘッドジンバルアセンブリと一体化した回転式pztマイクロアクチュエータ、及び、これを備えたディスク装置 |
JP2007228782A (ja) * | 2006-01-24 | 2007-09-06 | Ngk Insulators Ltd | 圧電/電歪デバイス |
US7345406B2 (en) | 2001-01-18 | 2008-03-18 | Ngk Insulators, Ltd. | Piezoelectric/electrostrictive device |
US7420785B2 (en) | 2004-03-03 | 2008-09-02 | Tdk Corporation | Suspension assembly, hard disk drive, and method of manufacturing suspension assembly |
JP2015125785A (ja) * | 2013-12-25 | 2015-07-06 | 日東電工株式会社 | ヘッド・ジンバル・アセンブリ |
JP6994131B1 (ja) | 2021-05-25 | 2022-01-14 | 崇城 小峰 | Mc型レコード再生用カンチレバー、mc型レコード再生用カートリッジ、およびレコードプレーヤー |
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US7538984B2 (en) * | 2005-12-16 | 2009-05-26 | Sae Magnetics (H.K.) Ltd. | Rotational PZT micro-actuator with a rotatable plate |
KR20070087871A (ko) * | 2006-01-06 | 2007-08-29 | 삼성전자주식회사 | 하드 디스크 드라이브의 헤드슬라이더 |
US7623321B2 (en) * | 2006-11-07 | 2009-11-24 | Sae Magnetics (H.K.) Ltd. | Micro-actuator including electrical connection shifting circuit, head gimbal assembly and disk drive unit with the same |
US7855489B2 (en) * | 2007-01-31 | 2010-12-21 | Hitachi Global Storage Technologies, Netherlands, B.V. | Microactuator substrate |
US8240024B2 (en) * | 2009-08-25 | 2012-08-14 | International Business Machines Corporation | Methods for fabricating magnetic transducers using post-deposition tilting |
US8351152B2 (en) * | 2009-08-25 | 2013-01-08 | International Business Machines Corporation | Magnetic writer structures formed using post-deposition tilting |
US8416537B2 (en) * | 2009-11-06 | 2013-04-09 | International Business Machines Corporation | Recording head with tilted orientation |
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JP2003208770A (ja) * | 2000-07-04 | 2003-07-25 | Matsushita Electric Ind Co Ltd | ヘッドアクチュエータおよびこれを用いたハードディスクドライブ |
JP4593874B2 (ja) * | 2000-07-04 | 2010-12-08 | パナソニック株式会社 | ヘッドアクチュエータおよびこれを用いたハードディスクドライブ |
US6956724B2 (en) | 2000-08-24 | 2005-10-18 | Tdk Corporation | 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 |
EP1225644A2 (en) * | 2001-01-18 | 2002-07-24 | Ngk Insulators, Ltd. | Piezoelectric/electrostrictive device and method of producing the same |
EP1225644A3 (en) * | 2001-01-18 | 2005-09-07 | Ngk Insulators, Ltd. | Piezoelectric/electrostrictive device and method of producing the same |
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US7345406B2 (en) | 2001-01-18 | 2008-03-18 | Ngk Insulators, Ltd. | Piezoelectric/electrostrictive device |
US7420785B2 (en) | 2004-03-03 | 2008-09-02 | Tdk Corporation | Suspension assembly, hard disk drive, and method of manufacturing suspension assembly |
JP2007179726A (ja) * | 2005-12-28 | 2007-07-12 | Shinka Jitsugyo Kk | ヘッドジンバルアセンブリと一体化した回転式pztマイクロアクチュエータ、及び、これを備えたディスク装置 |
JP2007228782A (ja) * | 2006-01-24 | 2007-09-06 | Ngk Insulators Ltd | 圧電/電歪デバイス |
JP2015125785A (ja) * | 2013-12-25 | 2015-07-06 | 日東電工株式会社 | ヘッド・ジンバル・アセンブリ |
JP6994131B1 (ja) | 2021-05-25 | 2022-01-14 | 崇城 小峰 | Mc型レコード再生用カンチレバー、mc型レコード再生用カートリッジ、およびレコードプレーヤー |
Also Published As
Publication number | Publication date |
---|---|
JP4387596B2 (ja) | 2009-12-16 |
US6943990B1 (en) | 2005-09-13 |
EP1152401A4 (en) | 2003-01-15 |
CN1333386C (zh) | 2007-08-22 |
EP1152401A1 (en) | 2001-11-07 |
KR20010075186A (ko) | 2001-08-09 |
CN1318192A (zh) | 2001-10-17 |
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