JP2001210031A - Rotation type head actuator and disk drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contrive the reduction of the maximum width of a coil supporting part of a bending type head actuator and the prevention of damage of the outer surface of a movable coil in an assembling operation etc. SOLUTION: This rotation type head actuator is constituted in such a manner that the inside of an inner opening part 15a of the movable coil 15 is supported at the outside of an inner supporting part 42 of the coil which is disposed on the side face of a head arm 11, the maximum width of a coil supporting part 41 is extremely reduced and the outer periphery of the movable coil is covered by outside resin layers 46, 56 or a detachable cover member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a large-capacity storage device capable of recording and / or reproducing large-capacity data using a rotary recording medium such as a magnetic disk, an optical disk and a magneto-optical disk. The present invention belongs to the technical field of a rotary head actuator most suitable for application and a disk drive device using the rotary head actuator.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 12 to 15, a removable hard disk (hereinafter, referred to as an R-HDD) 1 which is an example of a disk drive device is an example of a rotating large-capacity storage medium. And the hard disk 2 composed of a magnetic disk is the cartridge 3
The R-HDD 1 is configured so that the hard disk 2 is exchangeably (removably detachable) loaded into the R-HDD 1 by the cartridge 3. A spindle motor 4 is mounted in the R-HDD 1, and a center core 5 made of a ferromagnetic material of the hard disk 2 loaded in the R-HDD 1 by the cartridge 3 is used as a motor shaft 4 a of the spindle motor 4. Chucking magnet 6 attached to the outer periphery of the upper end
Cartridge 3 after magnetic chucking
The inner hard disk 2 is rotated by a spindle motor 4 in the direction of arrow a.

Then, the cartridge 3 in the R-HDD 1 is
The bending type head actuator 8 which is a rotary type head actuator is mounted at a position adjacent to the loading position. The bent head actuator 8 includes a head arm 11 inserted around the outer periphery of an arm shaft 9 via a bearing 10.
A pair of upper and lower suspensions 12 bent at a predetermined angle to the tip of the head arm 11, a pair of upper and lower flying head sliders 13 attached to the inner surfaces of the tips of the upper and lower suspensions 12, A substantially V-shaped coil outer supporting portion 14 integrally formed on a side surface of the arm 11 opposite to the suspension 12 side, and as shown in FIGS. The voice coil motor is composed of a movable coil 15 horizontally mounted on the inner side 14a of the support portion 14 by bonding or outsert molding, and a magnetic circuit assembly 16 for driving the movable coil 15. The magnetic circuit assembly 16 is an R-HDD 2
1 and a pair of upper and lower yokes 17, 18
And a magnet plate 19 which is horizontally attracted to one of the yokes 17 and 18 and is adjacent to the movable coil 15 in a parallel manner above or below the movable coil 15 to form a closed magnetic circuit.

The bending type head actuator 8 causes the magnetic circuit assembly 16 to generate thrusts in the directions indicated by the arrows b and c by the magnetic circuit assembly 16 by switching the direction of energization to the movable coil 15 so that the head arm 11 and the vertical The pair of suspensions 12 are rotated about the arm shaft 9 in the directions of arrows b and c. In the unloaded state, as shown by a solid line in FIG. 13, the pair of upper and lower flying head sliders 13 is moved by the head arm 11 in the direction of arrow b to the unload position P1, and at this time, the pair of upper and lower suspension heads 12 is moved. Are mounted on the upper and lower tapered surfaces of a suspension guide 22 horizontally and cantileverly supported in the R-HDD 1 by a pair of upper and lower convex portions 21 stamped on the upper and lower opposing surfaces on the tip side. By the tip side of the pair of upper and lower suspensions 12 being pushed up and down against its own spring force,
The vertical interval between the pair of upper and lower flying head sliders 13 is pushed to be greater than the thickness of the hard disk 2.

Then, the cartridge 3 is loaded into the R-HDD 1 and the hard disk 2 magnetically chucked by the chucking magnet 6 is started to rotate in the direction of the arrow a by the spindle motor 4, and the hard disk 2 is driven at a predetermined high speed. Rotational speed (2,700 rpm
After that, the bending type head actuator 8 is driven to load, and the head arm 11 and the pair of upper and lower suspensions 12 are rotated about the arm shaft 9 in the direction of arrow c. Then, a pair of upper and lower suspensions 1
The pair of flying head sliders 13 at the top and bottom of FIG.
Is rotated in the direction of arrow c from the unload position P1 indicated by the solid line, and a pair of upper and lower floating head sliders 13 are drawn from a head insertion opening 3b formed in the front surface 3a of the cartridge 3 in a horizontally long state. 13 is inserted into the outermost peripheral position P2 of the hard disk 2 indicated by a solid line from the direction of arrow c. At this time, a pair of upper and lower convex portions 21 on the tip side of the pair of upper and lower suspensions 12 is
2 slides on the upper and lower tapered surfaces, and the distal ends of the pair of upper and lower suspensions 12 close up and down by their own spring force, thereby closing the upper and lower intervals of the pair of upper and lower flying head sliders 13. Is landed on the upper and lower recording surfaces at the outermost peripheral position P2 of the hard disk 2.

On the other hand, the arrow a
Since the air flow in the direction of arrow a is generated on the upper and lower recording surfaces of the hard disk 2 which is driven to rotate at a high speed in the direction, a pair of upper and lower flying head sliders 13 is formed.
The upper surface of the hard disk 2 is floated on the upper and lower recording surfaces by being pressed against the airflow on the upper and lower recording surfaces of the hard disk 2 by the spring force of the pair of upper and lower suspensions 12.

After the completion of the loading, the bending type head actuator 8 is driven to seek, and the head arm 11 and the pair of upper and lower suspensions 12 move the pair of upper and lower flying head sliders 13 of the hard disk 2 as shown in FIG.
In FIG. 3, seek is performed in the direction of the arrows b and c between the outermost peripheral position P2 indicated by a one-dot chain line and the innermost peripheral position P3 indicated by a dotted line, and information recording and reproduction on the hard disk 2 are performed.

The pair of upper and lower flying head sliders 13 are sought in the directions of arrows b and c with respect to the hard disk 2 by an arc movement about the arm shaft 9.
Generates a skew angle (meaning an opening angle of the flying head slider 13 with respect to a tangent line of the recording track) θ, and the skew angle is inverted to a plus skew angle + θ and a minus skew angle −θ at a radial midpoint of the recording track. Is done.
When the pair of upper and lower flying head sliders 13 is moved to the outermost peripheral position P2 indicated by the dashed line in FIG. 13, the plus skew angle + θ becomes maximum, and the pair of upper and lower flying head sliders 13 is indicated by dotted lines in FIG. Innermost peripheral position P3 shown
The negative skew angle −θ is configured to be the maximum when moved to.

As the rotary head actuator, a linear actuator in which a pair of upper and lower suspensions are linearly attached to the tip of a head arm, and FIGS.
As shown in FIG. 14, there is a bent head actuator 8 in which a pair of upper and lower suspensions 12 is bent at a predetermined angle and attached to the tip of a head arm 11. The bent head actuator 8 moves the pair of upper and lower floating head sliders 13 at the tips of the upper and lower suspensions 12 into and out of the cartridge 3 through the head insertion opening 3b of the cartridge 3 as compared with the linear actuator. And unloading), it is possible to reduce the space for moving the pair of upper and lower suspensions 12, and the like.
Head insertion opening 3b, suspension guide 2
2, a dynamic load / unload mechanism for opening and closing the pair of upper and lower flying head sliders 13 in the vertical direction can be simplified and high reliability can be ensured.
The HDD 1 can be provided at low cost. Also, by bending the head arm 11 and the pair of upper and lower suspensions 12 at a predetermined angle, the distance L between the arm shaft 10 and the motor shaft 4a of the spindle motor 4 is reduced, and the entire R-HDD 1 is Miniaturization is also possible.

[0010]

By the way, in the conventional R-HDD 1 using the bending type head actuator 8,
As shown in FIGS. 14 and 15A, the left and right sides of the outer peripheral surface 15 a of the movable coil 15 which is a substantially coiled air core coil and is formed into a flat coil shape are integrated with the head arm 11. An adhesive 23 is attached to the inner side 14a of the formed substantially V-shaped coil outer supporting portion 14, or the movable coil 15 is made of synthetic resin 24 inside the coil outer supporting portion 14 as shown in FIG. 14a, the outer periphery of the outer peripheral surface 15a of the coil 15 is surrounded by a thick outer resin layer 24a.
The coil support portion 25 in which the outside of the movable coil 15 is supported by the coil outside support portion 14 is employed such that the inside resin portion 24b is filled in the inside opening portion 15b which is the air core portion.

However, in such a structure in which the outside of the movable coil 15 is supported by the coil outer support portion 14, the maximum width W1 of the coil support portion 25 is significantly larger than the maximum width W1 of the movable coil 15. Therefore, as shown by the solid line in FIG. 13, when the bending type head actuator 8 is returned to the unload position P1 in the direction of the arrow b, the coil supporting portion 14 is easily interfered with the front surface 3a of the cartridge 3.

At this time, the motor shaft 4 of the spindle motor 4
If the distance L between the shaft a and the arm shaft 9 of the bending type head actuator 8 is increased, the front surface 3a of the cartridge 3 can be increased.
However, if the distance L between the axes is increased, as shown by the dotted line in FIG. The minus skew angle -θ when moved to the position P3 increases, and the hard disk 2
The flying attitude of the pair of upper and lower flying head sliders 13 with respect to the upper and lower recording surfaces becomes unstable, causing recording / reproducing failure of information. In the worst case, the pair of upper and lower flying head sliders 13 contact the hard disk 2. But both could crash. Further, if the distance L between the axes is increased, the depth dimension of the R-HDD 1 is also increased, and there is a problem that the R-HDD 1 becomes large.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and the maximum width of a coil supporting portion for supporting a movable coil on a head arm can be significantly reduced. It is an object of the present invention to provide a rotary head actuator capable of preventing the outer peripheral surface of the movable coil from being damaged in the above-described operation.

[0014]

In order to achieve the above object, a rotary head actuator according to the present invention comprises a head arm provided on a side of a coil arm provided on a side surface of a head arm opposite to a suspension side. The movable coil formed in a flat coil shape supports the inside of the opening, and at least the outer periphery of the movable coil is covered with a protective layer, an outer resin layer, and a removable cover member.

[0015] In the rotary head actuator of the present invention configured as described above, the inside of the opening of the movable coil is supported by the coil inside support of the head arm. Can be significantly reduced. Moreover, since the outer periphery of the movable coil is covered with a protective layer, an outer resin layer, and a removable cover member,
The outer peripheral surface of the movable coil does not come into direct contact with another object.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a rotary head actuator of the present invention is applied to a bent head actuator of a removable hard disk drive (R-HDD) will be described below with reference to FIGS. . The same components as those in FIGS. 12 to 15 are denoted by the same reference numerals, and the description will not be repeated.

"Explanation of movable coil" First, FIG.
As is apparent from a comparison between (B) and (A) and (B) of FIG. 15, the present invention relates to a movable coil 15 which is an air-core type having the same shape and the same size as the conventional one and formed into a flat coil shape. Is used. Then, as shown in the cross-sectional view of the coil wire in FIG. 10, for example, a copper wire 32 having a diameter of 0.12 mm is used as the coil wire 31 of the movable coil 15.
The outer periphery of the copper wire 32 is coated with a jacket such as an enamel insulating layer 33 having a thickness of 0.006 mm and a heat sealing layer 34 made of a thermoplastic resin having a thickness of 0.008 mm in two layers. 31 has an outer diameter of 0.148 mm.

Then, the coil wire 31 is wound around the outer periphery of a substantially taper-shaped forming bobbin, and heated by blowing hot air or the like, thereby forming a heat-sealing layer as shown in the sectional view of the movable coil in FIG. The coil 34 is melted and the respective coil wires 31 are heat-sealed (coupled) to each other by the melted heat-sealing layer 34, so that the air-core, flat coil-shaped movable coil 15 is formed. . Note that FIG.
Shows the cross section of the most common movable coil 15 wound up by the asymmetric arrangement winding method in which the coil wires 31 can be wound most densely.
4 is firmly heat-sealed.

[First Embodiment] Next, referring to FIG. 1A, FIG. 2A, and FIG. 3 to FIG. 5, the coil supporting portion 4 in the bending type head actuator 8 of the present invention will be described.
The first embodiment will be described. First, a substantially V-shaped coil inner support portion 42 is provided on a side surface of the head arm 11 of the bent head actuator 8 opposite to the pair of upper and lower suspensions 12 on the side of the connection portion 43. Are integrally formed. The coil inner support portion 42 is arranged horizontally and parallel with a step 44 below the connection portion 43, and the upper surface 42a of the coil inner support portion 42 and the lower surface 43a of the connection portion 43 are substantially flat. The outer surface 42b of the coil inner support portion 42 is formed substantially in a V-shaped inner peripheral surface 15 of the inner opening 15b of the movable coil 15.
It is formed in a V shape along c. In order to prevent the movable coil 15 from being damaged in the connecting step of the movable coil 15 to be described later, it is preferable that the edge portion of the coil inner side support portion 42 be subjected to an R surface treatment or a C surface treatment.

In the first embodiment, the movable coil 15 is inserted and bonded to the outside of the outer side surface 42b of the coil inner support portion 42. Therefore, as shown in FIG. 5, at least the outer peripheral surface 15a of the movable coil 15 and the inner peripheral surface 15c of the inner opening 15b are coated with an outer resin layer 46 made of synthetic resin as a protective layer and an inner resin layer 47. ing. The outer resin layer 46 has a thickness T.

The outer and inner resin layers 46, 4
The simplest coating method of No. 7 is a method of dipping the entire movable coil 15 in a liquid resin layer (so-called jab dipping method), and the movable coil 15 dipped in the liquid resin layer for a predetermined time is coated with the liquid coil. What is necessary is just to pull out from the resin layer and to harden it by a hardening means. As the most suitable thermosetting synthetic resin used in this method, for example, epoxy resin or UV
There are curable resins and the like. When the resin layer is coated by this method, as shown in FIG. 5, the inner and outer peripheral surfaces 15a and 15c and the upper and lower surfaces 15d and 1d of the movable coil 15 are formed.
Outer and inner resin layers 46 and 47 and upper and lower resin layers 48 and 49 are coated on the entire circumference of 5e. However, in the present invention, the outer and inner resin layers 46, 47
Alone can achieve the original purpose.

Therefore, the movable coil 15 is inserted from below into the outside of the coil inner support portion 42 through the inner opening 15b, which is an air core portion, and the inner resin layer 4 of the movable coil 15 is inserted.
Part 7 of the inner peripheral surface of the V-shaped portion 7 and the horizontal upper resin layer 4
8 is adhered to the V-shaped outer surface 42b of the coil inner support portion 42 with the outer adhesive 50, and the coil inner support portion 4
The movable coil 15 is supported horizontally (parallel) outside the frame 2. At this time, a part of the upper surface 15d of the movable coil 15 is also adhered to the lower surface 53a of the connection portion 53,
The adhesive strength can also be improved.

At this time, the entire periphery of the movable coil 15 is coated with resin layers 46, 47, 48, and 49, which are protective layers, so that the movable coil 15 is inserted outside the coil inner support portion 42 and adhered. The moving coil 15
Outer peripheral surface 15a, inner peripheral surface 15c and upper and lower surfaces 15d, 15
e is in direct contact with another object, and the insulating layer 33 and the like, which are the jacket of the coil wire 31 of the movable coil 15, are damaged, the copper wire 32 is exposed, and the movable coil 15 becomes defective. The danger of doing so can be avoided.

According to the thus configured coil supporting portion 41, the movable coil 1 is supported by the coil inner supporting portion 42.
5, the maximum width W3 of the coil support portion 41 is equal to the maximum width W2 of the movable coil 15 (W3), as shown in FIG.
= W2 + 2T). Therefore, as described with reference to FIG. 13, even if the inter-axis distance L between the arm shaft 10 and the motor shaft 4 is not made unnecessarily large, the bending type head actuator 8 can be moved to the unload position P.
When the coil supporting portion 41 is returned to the direction 1 in the direction of the arrow b, the danger of the coil support portion 41 being interfered by the front surface 3a of the cartridge 3 can be avoided. Moreover, since the outer peripheral surface 15a of the movable coil 15 is covered with the outer resin layer 46 as a protective layer, when the bent head actuator 8 is incorporated into the arm shaft 9 of the R-HDD 1 or the magnetic circuit assembly 16, The risk that the outer peripheral surface 15a of the movable coil 15 comes into direct contact with another object, the insulating layer 33 or the like, which is a jacket, is damaged, the copper wire 32 is exposed, and the movable coil 15 becomes a defective product can be avoided. can do.

At this time, in order to make the maximum width W2 of the coil supporting portion 41 as small as possible, it is necessary to make the thickness T1 of the thinnest portion of the outer resin layer 46 as thin as possible. But,
From the viewpoint of preventing the movable coil 15 from being damaged, the thickness T1 of the thinnest portion of the outer resin layer 46 needs to have a certain thickness, for example, 1 mm or less. The thickness T1 of the thin portion is 1 mm or less, and preferably 0.1 mm to 0.5 mm is most practical. The coil inner supporting portion 42 is preferably formed in a substantially V shape from the viewpoint of reducing the weight of the head arm 11. However, the coil inner supporting portion 42 is not necessarily required to be V-shaped, and the V-shaped inner space of the coil inner supporting portion 42 is formed. By filling, only the outer surface 42b may be formed in a substantially trapezoidal shape along the inner peripheral surface 15c of the movable coil 15.

[Second Embodiment] Next, FIG.
A second embodiment of the coil supporting portion 41 in the bending type head actuator 8 of the present invention will be described with reference to FIGS. 2B, 6 and 7. In this case, the movable coil 15 is connected to the inner opening 15b. Is inserted into the outer periphery of the coil inner support portion 42 of the head arm 11 with play, and the movable coil 15 is integrally formed on the outer side of the V-shaped outer surface 42b of the coil inner support portion 42 by synthetic resin. It was done. By this outsert molding, the outer resin layer 56 and the inner resin layer 57, which are protective layers, are simultaneously formed on the outer periphery of the outer peripheral surface 15a of the movable coil 15 and inside the inner opening 15b. The outer resin layer 56 has a thickness T. In this outsert molding, the head arm 1 is placed in the mold.
The positioning of the coil inner support portion 51 and the movable coil 15 is performed, and the molten resin is injected into the outside of the outer peripheral surface 15a of the movable coil 15 and the inside of the inner opening 15b in the mold. The movable coil 15 is integrally joined to the outside of the coil inner support portion 51 by curing the molten resin, and a liquid polymer (LCP) or the like can be used as a synthetic resin material having excellent fluidity and rigidity. According to the outsert molding, since the movable coil 15 can be integrally coupled to the outside of the coil inner support portion 42 at the time of molding, the assembly operation of the movable coil 15 to the coil inner support portion 42 is not required at all. At the time of this outsert molding, a jig insertion hole 58 for positioning the movable coil 15 in the mold with respect to the coil inside support portion 42 is formed in the inside opening 15b.

Note that FIG. 1B, FIG. 2B, and FIG.
In FIG. 7, the movable coil 1 is formed by outsert molding.
The outer resin layer 56 and the inner resin layer 57 were simultaneously formed on the outer side of the outer peripheral surface 15a and inside the inner opening 15b.
It is also possible to form a resin layer on the upper and lower surfaces 15d and 15e of the movable coil 15 at the same time so that the entire periphery of the movable coil 15 is surrounded by the resin layer.

According to the coil supporting portion 41 thus configured, the movable coil 1 is supported by the coil inner supporting portion 42.
5, the maximum width W3 of the coil support portion 41 is equal to the maximum width W2 of the movable coil 15 (W3), as shown in FIG.
= W2 + 2T). Therefore, as described with reference to FIG. 13, even if the inter-axis distance L between the arm shaft 10 and the motor shaft 4 is not made unnecessarily large, the bending type head actuator 8 can be moved to the unload position P.
When the coil supporting portion 41 is returned to the direction 1 in the direction of the arrow b, the danger of the coil support portion 41 being interfered by the front surface 3a of the cartridge 3 can be avoided. In addition, since the outer peripheral surface 15a of the movable coil 15 is covered with the outer resin layer 56 as a protective layer, when the bent head actuator 8 is incorporated into the arm shaft 9 of the R-HDD 1 or the magnetic circuit assembly 16, The risk that the outer peripheral surface 15a of the movable coil 15 comes into direct contact with another object, the insulating layer 33 or the like, which is a jacket, is damaged, the copper wire 32 is exposed, and the movable coil 15 becomes a defective product can be avoided. can do.

At this time, in order to make the maximum width W2 of the coil supporting portion 41 as small as possible, it is necessary to make the thickness T1 of the thinnest portion of the outer resin layer 56 as thin as possible. But,
From the viewpoint of preventing the movable coil 15 from being damaged, the thinnest portion T1 of the outer resin layer 56 needs to have a certain thickness, for example, 1 mm or less. Also, considering the fluidity of a molten resin such as a liquid polymer in a mold at the time of outsert molding, the thickness T of the thinnest portion of the outer resin layer 56 is 1 mm or less, preferably, 0.1mm ~
It can be said that 0.5 mm is the most practical.

At the time of outsert molding, as shown in the sectional view of the movable coil and the coil inner supporting portion in FIG.
Recesses 42c are formed in both upper and lower corner portions of the coil inner support portion 42.
Is formed, and a portion 57a of the inner resin layer 57 is
By wrapping around inside 2c, it is possible to further increase the coupling force of movable coil 15 to coil inner support portion 42, that is, the rigidity. In addition, the concave portion 42 c for resin wraparound may be formed at any position of the coil inner side support portion 42. Further, in order to prevent the movable coil 15 from being damaged, it is preferable to perform an R surface treatment or a C surface treatment on an edge portion of the coil inner support portion 42.

Third Embodiment Next, referring to FIG.
A third embodiment of the coil supporting portion 41 in the bending type head actuator 8 of the present invention will be described. In this case, the inner peripheral surface 1 of the inner opening 15b of the movable coil 15 is described.
5c is adhered to the outside of the outer surface 42b of the coil inner support portion 42 and the lower surface 43a of the connection portion 43 with an adhesive 50 to support the movable coil 15c horizontally (parallel).
A cover member 66 such as a rubber or synthetic resin molded product constituting a protective layer is detachably attached to the outer periphery of the outer peripheral surface 15a. Also in this case, the thickness T of the thinnest portion of the cover member 66 is 1 mm or less, preferably 0.5 mm.
mm or less is practical. In the third embodiment, the same effects as those of the first and second embodiments can be obtained. However, a cover is attached to the outer periphery of the movable coil 15 which is previously adhered to the outside of the coil inner support portion 42. Member 6
6 is merely detachably attached, and has features such as a simple structure, ease of assembly and low cost.

"Fourth Embodiment" Next, referring to FIG.
A fourth embodiment of the coil supporting portion 41 in the bent head actuator 8 of the present invention will be described. In this case, the coil inner supporting portion 51 is changed from the above-described substantially V-shaped two-leg structure to an I-shaped or substantially trapezoidal shape. And the like, and the movable coil 15 is supported horizontally (parallel) outside the coil inner support portion 42 by the method described in the above-described first to third embodiments. And the first
-The same effects as those of the third embodiment can be obtained.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made based on the technical idea of the present invention. In the above embodiment, the movable coil 15
Are integrally bonded to the coil inner support portion 42 by bonding or outsert molding, but may be integrally connected by screwing.

[0034]

According to the rotary head actuator of the present invention, the inside of the opening of the movable coil is supported by the inside support of the coil of the head arm of the coil support. Can be made significantly smaller than in the past, so that, for example, in a removable hard disk drive, it is possible to prevent the support portion from being interfered with by the cartridge. Further, it is possible to minimize the axial distance between the arm axis of the rotary head actuator and the motor axis of the spindle motor, prevent an increase in the minus skew angle, and reduce the depth dimension of the drive device. .

Further, in the rotary head actuator according to the present invention, a protective layer having a thickness of 1 mm or less is provided on the outer periphery of the movable coil.
Since the outer resin layer is covered with the removable cover member, it is possible to prevent the outer peripheral surface of the movable coil from directly contacting another object while minimizing the maximum width of the coil support portion. Therefore, it is possible to prevent the outer peripheral surface of the movable coil from directly contacting another object and being damaged during assembly work for assembling the rotary head actuator inside the drive device, thereby preventing defective products. Therefore, the safety of the assembling work and the assembling workability itself can be improved.

In the rotary head actuator according to the present invention, when the outer periphery of the movable coil is covered with the outer resin layer, the movable coil is molded and then immersed in a liquid resin layer, an outsert molding method, and a removable cover. Since the member is used, the outer periphery of the movable coil can be easily covered with the outer member. In particular, according to the method of dipping in the liquid resin layer or the outsert method, the outer resin layer has a thickness of 1 mm or less. , Preferably with a minimum thickness of 0.1 mm to 0.5 mm.

Further, the disk drive device of the present invention
With the provision of the rotary head actuator and the bent head actuator having the above-described features, a compact, high-performance, high-quality disk drive device can be realized.

[Brief description of the drawings]

FIG. 1 is a partially cutaway plan view of an essential part for explaining first and second embodiments of a coil supporting portion of a bending type head actuator to which the present invention is applied.

FIG. 2 is a cross-sectional view taken along the line AA of FIG.
It is sectional drawing in the BB arrow of (B).

FIG. 3 is an exploded perspective view of a bending type head actuator and a movable coil for explaining the first embodiment.

FIG. 4 is a perspective view showing a state where the movable coil of FIG. 3 is assembled to a bent head actuator.

FIG. 5 is an enlarged cross-sectional view showing a part of the movable coil shown in FIGS. 1 (A) and 2 (A).

FIG. 6 is a perspective view illustrating a second embodiment of the coil supporting portion of the bending type head actuator of the present invention.

FIG. 7 is a cross-sectional side view showing, on an enlarged scale, a part of a movable coil and a coil inner side support portion of FIG. 6;

8A and 8B are a partially cutaway plan view and a cross-sectional side view taken along the line CC for explaining a third embodiment of the coil support portion of the bending type head actuator of the present invention.

FIG. 9 is a perspective view for explaining a fourth embodiment of the coil supporting portion of the bending type head actuator of the present invention.

FIG. 10 is an enlarged sectional view illustrating a coil wire of a movable coil.

FIG. 11 is an enlarged sectional view illustrating molding of a movable coil.

FIG. 12 is a perspective view illustrating a conventional general R-HDD.

FIG. 13 is a plan view illustrating the bending type head actuator of the R-HDD, the positional relationship between the cartridge and the hard disk, and the loading / unloading and information recording / reproducing operations.

FIG. 14 is an exploded perspective view illustrating a conventional bent head actuator and a magnetic circuit assembly.

FIG. 15 is a partially cutaway plan view illustrating two examples of a coil supporting portion of a conventional bent head actuator.

[Explanation of symbols]

1 is a removable hard disk drive (R-HDD) as a disk drive, 2 is a hard disk as a recording medium, 3 is a cartridge, 4 is a spindle motor, 4a is a motor shaft, and 8 is a rotary head actuator. Bending head actuator, 9 is an arm axis, 11 is a head arm, 12 is a suspension, 13
Is a flying head slider, 15 is a movable coil, 15a is an outer peripheral surface of the movable coil 15, 41 is a coil support portion, 42b is an outer surface of the coil support portion 42, 46 and 56 are outer resin layers serving as protective layers, and 50 is an adhesive. The agent, 66 is a cover member as a protective layer, W3 is the maximum width of the coil support, T is the wall thickness, L is the distance between axes, and -θ is the minus skew angle.

[Procedure amendment]

[Submission Date] January 25, 2000 (2000.1.2
5)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 6

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claim 7

[Correction method] Change

[Correction contents]

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yotaro Sanada 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (72) Inventor Takashi Yamada 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation F term (reference) 5D068 AA01 BB01 CC12 EE18 GG25 5H633 BB02 BB15 GG06 GG08 HH02 JA08 5H641 BB03 BB17 BB18 GG03 GG05 GG06 GG07 GG12 HH02 JA15

Claims (7)

[Claims] A head arm which is rotated about an arm axis; a flying head slider supported at a tip of the head arm via a suspension; and a side surface of the head arm opposite to the suspension side. A movable coil formed in a flat coil shape, supported by an inner opening outside the coil inner support, and rotated integrally with the head arm. A rotary head actuator comprising: a protective layer that covers at least the outer periphery of the coil. 2. A head arm rotated about an arm axis, a flying head slider supported at a tip of the head arm via a suspension, and a head arm provided on a side surface of the head arm opposite to the suspension side. A movable coil that is formed in a flat coil shape, is supported outside the coil inner support by an inner opening, and is rotated integrally with the head arm; A rotary head actuator comprising: an outer resin layer that covers at least the outer periphery of the movable coil by being immersed in a liquid resin layer after the molding. 3. A head arm rotated about an arm axis, a flying head slider supported at a tip of the head arm via a suspension, and provided on a side surface of the head arm opposite to the suspension side. A movable coil that is formed in a flat coil shape, is supported outside the coil inner support by an inner opening, and is rotated integrally with the head arm; A rotary head actuator comprising: an outer resin layer covering at least the outer periphery of the movable coil by being integrally joined to the outside of the coil inner support portion by outsert molding using a synthetic resin. 4. A head arm rotated about an arm axis, a flying head slider supported at a tip of the head arm via a suspension, and provided on a side surface of the head arm opposite to the suspension side. A movable coil formed in a flat coil shape, supported by an inner opening outside the coil inner support, and rotated integrally with the head arm; And a cover member detachably attached so as to cover the outer periphery. 5. The thinnest part of the outermost protective layer or outer resin layer or cover member of the movable coil according to claim 1 or 2 or 3 or 4 has a thickness of 1 mm or less. A rotary head actuator, comprising: 6. A disk drive device comprising the rotary head actuator according to claim 1, claim 2, claim 3, claim 3, claim 4, claim 5, or claim 6. 7. The disk drive device according to claim 7, wherein said rotary head actuator is constituted by a bent head actuator.