JP3657907B2 - Head assembly and storage device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a head assembly and a storage device that have a head at a tip and are attached to an actuator assembly or the like.
[0002]
In recent years, with the increase in recording density and miniaturization of magnetic disk devices as storage devices, the miniaturization of magnetic head assemblies equipped with magnetic heads that perform recording and reproduction has progressed, and signal patterns have been formed on suspensions. It has been broken. Therefore, it is desired to prevent damage to the signal pattern during assembly. In addition, it is required to improve the mounting accuracy of the magnetic head mounted for increasing the recording density.
[0003]
[Prior art]
2. Description of the Related Art Conventionally, a magnetic disk device has a magnetic head disposed on both sides or one side of a predetermined number of magnetic disks. The magnetic head is mounted on the tip of the suspension, and the suspension is attached to the tip of the carriage arm of the actuator. The magnetic head is moved in the radial direction of the magnetic disk by driving the actuator.
[0004]
FIG. 11 is an explanatory diagram of a magnetic head assembly in a conventional magnetic disk device. In FIG. 11A, a magnetic head assembly 11 has a magnetic head 13 provided with a thin film head on a slider fixed to an end of a suspension 12 formed by bending a metal plate such as stainless steel at a predetermined angle by an adhesive. To be installed. A mounting hole 14 is formed at the rear end of the suspension 12.
[0005]
On the other hand, the suspension 12 is formed with a signal pattern 15 for transmitting four signals for recording / reproducing with respect to the magnetic head 13, and is connected to the terminal of the magnetic head 13 at the front end portion and pulled out at the rear end portion. The terminal portion 16 is provided on one side.
[0006]
In the pattern formation, as shown in FIG. 11B, an insulating film 17 is formed on the base material 12a of the suspension 12, and the signal pattern 15 of four conductor patterns is formed on the insulating film 17 with copper (Cu) or the like. Is formed by etching or the like. An insulating protective film 18 (thickness of several μm) is formed on the signal pattern 15. Note that a metal film dummy pattern 19 for making the thickness of the protective film 18 constant is formed at a rear end portion of the suspension 12 other than the attachment hole 14 and the signal pattern 15. That is, the protective film 18 is formed on the entire surface of the signal pattern 15. This magnetic head suspension assembly 11 is attached to an actuator.
[0007]
Here, FIG. 12 shows a plan view of the actuator. In FIG. 12, the actuator 20 includes a plurality of carriage arms 22 that rotate around a rotation shaft 21 and a VCM (voice coil motor) 23 that includes a voice coil (not shown) as a drive unit. The above-described magnetic head assembly 11 is attached to the tip 22a where the attachment hole 24 of the carriage arm 22 is formed.
[0008]
FIG. 13 is an explanatory view of attachment of the conventional magnetic head assembly. In FIG. 13, first, spacers 25 are respectively fixed to the mounting holes 14 of the suspension 12, and the caulking holes of the spacers 25 are respectively fitted on the mounting holes 24 on both surfaces of the tip portion 22 a of one carriage arm 22. A predetermined number of the assembly assemblies are arranged in the vertical direction.
[0009]
On the other hand, movable clampers 26a and 26b are arranged on both sides, and a predetermined number of pressing portions 27a and 27b are provided in a comb-tooth shape. The respective pressing portions 27a and 27b are moved to the rear end portion of the suspension 12 between the respective assemblies, and the contact portions of the respective pressing portions 27a and 27b are formed in a tapered shape. That is, the tapered pressing portions 27a and 27b move between the assembly assemblies and come into contact with each other, thereby pressing and fixing the assembly assemblies from above and below.
[0010]
Then, the caulking ball 28 is press-fitted into the caulking hole of the spacer 25 from the mounting hole 14 of the suspension 12 from above, thereby applying a force from the inside to the mounting hole 24 of the distal end portion 22a of the carriage arm 22 to thereby apply the magnetic head. The assembly 11 is attached.
[0011]
[Problems to be solved by the invention]
However, as shown in FIG. 13, when the pressing portions 27a and 27b of the clampers 26a and 26b are moved from both sides to press the suspension 12 against the tip portion 22a of the carriage arm 22, the tip ends of the pressing portions 27a and 27b are suspended. There is a problem in that the protective film 18 and the signal pattern 15 formed at the rear end portion of 12 are cut and cut.
[0012]
Further, as described above, when the magnetic head 13 is mounted on the tip of the suspension 12, the slider warps due to the shrinkage due to the hardening of the adhesive, and the flying height of the slider on the magnetic disk is not constant. There is a problem in that variations occur and the function is degraded.
[0013]
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a high-quality head assembly and storage device with a high yield.
[0014]
[Means for Solving the Problems]
In order to solve the above problem, in claim 1,
In a head assembly comprising a head that performs recording and reproduction on a recording medium, and a head support member on which the head is mounted,
The head support member is provided in a signal pattern for transmitting a signal, a head mounting portion to which the head is fixed with an adhesive, and an adhesive application portion on the head mounting portion, and the head is placed thereon. A plurality of adjustment patterns having a predetermined height,
The adjustment patterns are separated from each other, and are formed in parallel at a predetermined interval in at least one of the width direction and the longitudinal direction of the head, and are formed in the signal pattern forming step, and the interval The amount of the adhesive applied between the two is adjusted .
[0015]
In claim 2,
A head that performs recording and reproduction with respect to a recording medium, a head support member on which the head is mounted, a head transport member to which the head support member is attached, and a drive unit that moves the head transport member on the recording medium. A storage device comprising an actuator assembly having:
The head support member is provided in a signal pattern for transmitting a signal, a head mounting portion to which the head is fixed with an adhesive, and an adhesive application portion on the head mounting portion, and the head is placed thereon. A plurality of adjustment patterns having a predetermined height,
The adjustment patterns are separated from each other, and are formed in parallel at a predetermined interval in at least one of the width direction and the longitudinal direction of the head, and are formed in the signal pattern forming step, and the interval The amount of the adhesive applied between the two is adjusted .
[0017]
[Action]
As described above, in the first to third aspects of the invention, the adjustment pattern is formed on the head mounting portion. This makes it possible to control the amount of adhesive applied and reduce the warpage of the head after the adhesive has hardened to make it constant, and to improve head mounting accuracy and to vary the flying characteristics of each head This makes it possible to stabilize the reproduction output.
[0018]
【Example】
FIG. 1 shows a configuration diagram of an embodiment of the present invention. FIG. 1 shows an internal plan view of a magnetic disk device 31 as a storage device, which is a portion surrounded by a cover 32 and a base 33, and a magnetic disk 35 which is a predetermined number of recording media in a spindle mechanism 34. Are installed side by side at a predetermined interval.
[0019]
On the other hand, an actuator assembly 37 is provided in the vicinity of the magnetic disk 35 so as to be rotatable by a rotary shaft 36. In the actuator assembly 37, one of the rotating shafts 36 constitutes a drive unit 39 including a boil coil 38 that constitutes a boil coil motor, and the other corresponds to the both surfaces or one surface of the magnetic disk 35 according to the number of magnetic disks 35. A carriage arm 40 which is a head carrying member arranged several times is configured.
[0020]
A magnetic head assembly 41 is attached to the tip of each carriage arm (described later). A magnetic head 44 is mounted on the head mounting portion 43 at the tip of the suspension 42 that is a head support member of the magnetic head assembly 41, and a protective cover 46 that is a protective member is formed on the mounting portion 45 to the carriage arm 40. (Described later).
[0021]
FIG. 2 shows a configuration diagram of the magnetic head assembly of FIG. 2A is a plan view, and FIG. 2B is a side view.
[0022]
In the magnetic head assembly 41 shown in FIGS. 2A and 2B, a head mounting portion 43 is formed at the front end of the suspension 42, and a mounting portion 45 is formed at the rear end. An attachment hole 45 a is formed in the attachment portion 45. A signal pattern 47 for transmitting four signals for recording and reproduction is formed on the suspension 42, and an insulating film 48 is formed on the signal pattern 47 (described in FIG. 3).
[0023]
Four terminals are formed at the tip of the signal pattern 47 extending to the head mounting portion 43, and the magnetic head 44 is mounted with an adhesive (described later). Also, signal pattern 47 is formed to avoid the mounting hole 45a extending to the mounting portion 45, the tip of the four terminals 47 ₁ to 47 ₄ for electrical connection with the outside is formed. The terminals 47 ₁ to 47 protective film 48 on ₄ is not formed.
[0024]
On the signal pattern 47 (insulating film 48) of the mounting portion 45, a metal member (for example, a stainless steel material having a thickness of about 50 μm) or a resin member (for example, a polyimide, polyurethane, phenol, or acrylic member) A protective cover 46 having a thickness of about 0.1 mm is attached by an adhesive member 49.
[0025]
On the other hand, a spacer 50 having a predetermined thickness is attached to the back surface of the attachment portion 45 of the suspension 42 by, for example, spot welding with a laser or the like. The spacer 50 is integrally formed with a cylindrical fitting portion 50a having an edge formed inside to be fitted into a mounting hole of the carriage arm 40 described later.
[0026]
Here, FIG. 3 shows an internal explanatory diagram of FIG. 3A is a perspective view, and FIG. 3B is a cross-sectional configuration diagram of a suspension mounting portion. As shown in FIG. 3A, terminals 45 _{5 to} 47 ₈ extending from the signal pattern 47 are formed without an insulating film at the tip of the head mounting portion 43 of the suspension 42.
[0027]
On the other hand, in the magnetic head 44, a thin film head element 44b is formed on the rear end surface of the slider 44a, and terminals 44c _{1 to} 44c ₄ for connection to the outside are formed in an L shape over the adjacent surface. When the magnetic head 44 is mounted, the terminals 44 c _{1 to} 44 c ₄ and the terminals 47 _{5 to} 47 ₈ of the head mounting portion 43 are electrically connected via the bumps 51 of gold balls.
[0028]
A dummy pattern 52 as an auxiliary pattern is formed around the signal pattern 47 in the attachment portion 45 of the suspension 42, and a protective film 48 is formed on the dummy pattern 52. A cross-sectional view of this portion is shown in FIG.
[0029]
That is, in FIG. 3B, an insulating film 53 such as polyimide is formed on the stainless steel constituting the suspension 42 by spin coating (for example, 3 μm), and plating (or sputtering) is performed on the insulating film 53 for etching. As a result, a signal pattern 47 such as copper and a dummy pattern 52 are formed (for example, 4 μm). The signal pattern 47 and the dummy patterns 52 on except for terminal 47 ₁ to 47 ₄ insulating film 48 such as polyimide is formed by spin coating (for example, several [mu] m). The same applies to the formation of portions other than the attachment portion 45 of the suspension 42.
[0030]
Then, for example, a stainless protective cover 46 is attached on the protective film 48 of the attachment portion 45 by an adhesive 49 (for example, several μm).
[0031]
That is, by forming the dummy pattern 52 in the mounting portion 45, the flatness of the protective film 48 can be obtained, whereby the flatness of the protective cover 46 can be obtained and the height accuracy (for example, around 10 μm) can be formed high. It is.
[0032]
Since the spacer 50, the suspension 42 (mounting portion 45), and the protective cover 46 are all made of stainless steel (SUS material) and have the same thermal expansion coefficient, distortion caused by a difference in deformation due to heat is prevented. It is something that can be done.
[0033]
Incidentally, in the magnetic head assembly 41 described above, the case in which is formed flush with the protective cover 46 to the terminal 47 ₁ to 47 ₄ for connection to an external, as shown in FIG. 11 (A) It may be provided so as to extend to one side.
[0034]
Next, FIG. 4 shows an enlarged view of the magnetic head portion of FIG. In FIG. 4, when the magnetic head 44 is mounted on the head connection portion 43 of the suspension 42, the adjustment patterns 53 a and 53 b are formed on the head mounting portion 43 in the process of forming the signal pattern 47 (for example, high About 10 μm). The adjustment patterns 53a and 53b are formed at predetermined intervals in the width direction at the mounting position of the magnetic head 44 so that the center of the magnetic head 44 coincides with the pattern center.
[0035]
It is mounted by applying a certain amount of adhesive 54 between the adjustment patterns 53a and 53b and bonding the magnetic head 44 thereto.
[0036]
That is, the magnetic head 44 is placed on the adjustment patterns 53a and 53b, so that the mounting height of the magnetic head 44 can be adjusted with higher accuracy, and the signal pattern 47 is protected when mounted. can do. Further, since the adhesive 54 is applied between the adjustment patterns 53a and 53b, the application amount can be controlled. As a result, the warpage of the magnetic head 44 due to the shrinkage at the time of curing of the adhesive 54 is reduced, and the warp between the magnetic heads 44 is constant and uniform, and the floating gap of each magnetic head 44 with respect to the magnetic disk is constant. The yield can be improved by being able to hold and preventing the reproduction variation between the magnetic heads 44.
[0037]
FIG. 5 is an explanatory diagram of another pattern shape of the adjustment pattern. In FIG. 5A, adjustment patterns 53a and 53b are formed in the head mounting portion 43 at predetermined intervals in the longitudinal direction at the mounting position of the magnetic head 44, and an adhesive is provided between the adjustment patterns 53a and 53b. 54 is applied.
[0039]
Next, FIG. 6 is an explanatory view of the actuator assembly. In FIG. 6, the actuator assembly 37 has a predetermined number of carriage arms 40 arranged on one side of the rotating shaft 36 at a predetermined interval, and the other side provided with a drive unit 39 provided with a voice coil 38 on a coil support plate 55. Is done. An FPC (flexible printed circuit board) 56 for transmitting / receiving signals to / from the voice coil 38 and the magnetic head 44 is supported by a fixing portion 57a. Reference numeral 59 denotes a presser plate.
[0040]
Further, at the tip of each carriage arm 40, there is an attachment portion 40a, and an attachment hole 40b is formed. The above-described magnetic head assembly 41 is attached to one side or both sides of the mounting portion 40a.
[0041]
FIG. 7 is an explanatory diagram for attaching the carriage arm of the magnetic head assembly. In FIG. 7A, the magnetic head assembly 41 (the attachment portion 45 of the suspension 42) is disposed on both surfaces of the attachment portion 40a of the carriage arm 40 via the spacer 50 described above. At this time, the fitting portion 50a of the spacer 50 is fitted into the mounting hole 40b.
[0042]
On the other hand, between the carriage arms 40, the pressing portions 61a and 61b of the movable clampers 60a and 60b are arranged in a comb shape at positions on both sides corresponding to the mounting portions 40 and 45. That is, the pressing portion 61a and the pressing portion 61b intervene between the carriage arms 40, and a taper is formed at the contact portion between the pressing portions 61a and 61b.
[0043]
Then, as shown in FIG. 7B, when the clampers 60a and 60b move, the pressing portions 61a and 61b intervene between the mounting portions 40a of the carriage arms 40, and the tapered portions come into contact with each other in the vertical direction. The part is fixed.
[0044]
In this state, the caulking ball 62 is pressed from above into the fitting portion 50a of the spacer 50 through the attachment hole 45a of the attachment portion 45 of the suspension 42, whereby the carriage arm 40 is attached by the fitting portion 50a of the spacer 50. The attachment hole 40b of the part 40a is pressed from the inside to be fixed.
[0045]
As shown in FIGS. 7A and 7B, when the pressing portions 61a and 61b move, the signal pattern 47 is protected without being cut by the protective cover 46 of the mounting portion 45 of the suspension 42. It can be done.
[0046]
In this embodiment, the case where the magnetic head assembly 41 is attached to the carriage arm 40 by caulking has been shown, but it may be attached with an adhesive (for example, an ultraviolet curable type, a thermosetting type, etc.), and in this case as well, pressing It is fixed by the portions 61 a and 61 b, and the signal cover 47 can be prevented from being cut by the protective cover 46.
[0047]
FIG. 8 is a schematic side view of the actuator assembly to which the magnetic head assembly is attached. As shown in FIG. 8, the actuator assembly 37 has a magnetic head assembly 41 attached to the tip of each carriage arm 40 arranged in parallel in the vertical direction.
[0048]
Then, the lead wire 63 connected to terminals 47 ₁ to 47 ₄ for external connection of the suspension 42 is connected to the terminal group 64 of the rotary shaft near along the side of the carriage arm 40, figure the terminal group 6 The FPC 56 shown in FIG.
[0049]
Next, FIG. 9 shows an external view of the magnetic disk device, and FIG. 10 shows an assembly drawing of the magnetic disk device. In FIG. 9, the magnetic disk device 31 includes a cover 32 and a base 33 enclosure in which a magnetic disk 35 and an actuator assembly 37 are housed, as shown in FIG. 1. Attached through. A printed board 73 on which a control circuit and an external connection connector are mounted is attached to the mounting bracket 71. Further, the divided portions of the cover 32 and the base 33 are overlapped with each other, and an adhesive tape 74 is wound around the overlapped portion to seal the inside.
[0050]
On the other hand, in FIG. 10, the actuator stopper 75 is press-fitted into the base 33, the actuator assembly 37 is attached to the base 33 with screws 76, and the cable fixing plate 58, the yoke 77 a and the side yoke 77 b are attached with screws 78. The yoke 77 a is inserted into the boil coil 38 of the actuator assembly 37. Reference numeral 79 denotes an actuator lock mechanism attached to the actuator assembly 37.
[0051]
In addition, a spindle mechanism 34 with a predetermined number of magnetic disks 35 attached to the base 33 is attached with screws 80. Then, as shown in FIG. 9, the cover 32 is covered and sealed with an adhesive tape 74.
【The invention's effect】
As described above, according to the first and second aspects of the invention, by forming the adjustment pattern on the head mounting portion, the amount of adhesive applied can be controlled to reduce the warpage of the head after the adhesive is cured. In addition to being able to keep the head constant, it is possible to improve the head mounting accuracy, eliminate variations in the flying characteristics of each head, and stabilize the reproduction output.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an embodiment of the present invention.
FIG. 2 is a configuration diagram of the magnetic head assembly of FIG. 1;
FIG. 3 is an internal explanatory diagram of FIG. 2;
4 is an enlarged view of the magnetic head portion of FIG. 2;
FIG. 5 is an explanatory diagram of another pattern for adjustment.
FIG. 6 is an explanatory diagram of an actuator assembly.
FIG. 7 is an explanatory diagram of attachment of a magnetic head assembly to a carriage arm.
FIG. 8 is a schematic side view of an actuator assembly to which a magnetic head assembly is attached.
FIG. 9 is an external view of a magnetic disk device.
FIG. 10 is an assembly diagram of the magnetic disk device.
FIG. 11 is an explanatory diagram of a magnetic head assembly in a conventional magnetic disk device.
FIG. 12 is a plan view of the actuator assembly.
FIG. 13 is an explanatory view of attachment of a conventional magnetic head assembly.
[Explanation of symbols]
31 Magnetic Disk Device 34 Spindle Mechanism 35 Magnetic Disk 36 Rotating Shaft 37 Actuator Assembly 38 Voice Coil 39 Drive Unit 40 Carriage Arm 41 Magnetic Head Assembly 42 Suspension 43 Head Mount Unit 44 Magnetic Head 45 Mounting Portion 47 Signal Pattern 48 Insulating Film 50 Spacer 52 Dummy patterns 53, 53a, 53b Adjustment patterns 60a, 60b Clampers 61a, 60b Pressing portions

Claims (2)

In a head assembly comprising a head that performs recording and reproduction on a recording medium, and a head support member on which the head is mounted,
The head support member is provided in a signal pattern for transmitting a signal, a head mounting portion to which the head is fixed with an adhesive, and an adhesive application portion on the head mounting portion, and the head is placed thereon. A plurality of adjustment patterns having a predetermined height,
The adjustment patterns are separated from each other, and are arranged in parallel at a predetermined interval in at least one of the width direction and the longitudinal direction of the head, and are formed in the signal pattern forming step, and the interval Adjusting the amount of adhesive applied between the head assembly and the head assembly. A head that performs recording and reproduction with respect to a recording medium, a head support member on which the head is mounted, a head transport member to which the head support member is attached, and a drive unit that moves the head transport member on the recording medium. A storage device comprising an actuator assembly having:
The head support member is provided in a signal pattern for transmitting a signal, a head mounting portion to which the head is fixed with an adhesive, and an adhesive application portion on the head mounting portion, and the head is placed thereon. A plurality of adjustment patterns having a predetermined height,
The adjustment patterns are separated from each other, and are formed in parallel at a predetermined interval in at least one of the width direction and the longitudinal direction of the head, and are formed in the signal pattern forming step, and the interval A storage device characterized by adjusting the amount of adhesive applied between the two .

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