JP2003030810A - Head suspension assembly and magnetic disk unit using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a read data transfer rate even when a reading magnetic head element has a large resistance component. SOLUTION: Conductive patterns R1, R2, W1, W2 are extended side by side in the longitudinal direction of a suspension 2 in a predetermined zone K. A conductor pattern R1 for a reading signal and a conductor pattern W1 for a writing signal are located in the area of the +X side of the suspension 2 with a center axis O as a boundary in the zone K. A gap between the conductor patterns R1, R2 located most in the center axis O side in each area of the zone K is considerably wider than that between the conductor patterns R1, W1 and that between the conductor patterns R2, W2 in the zone K.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head suspension assembly (also referred to as a head gimbal assembly) used in a magnetic disk device or the like, and a magnetic disk device using the same.

[0002]

2. Description of the Related Art Conventionally, a magnetic head having a slider and a magnetic read head element and a magnetic write head element provided on the slider, and a suspension for mounting the magnetic head near the tip and supporting the magnetic head. , A head suspension assembly is known. In such a head suspension assembly, in order to improve productivity without manually wiring lead wires, the suspension has two read signal conductor patterns for obtaining a read signal from the read magnetic head element. , And two write signal conductor patterns for supplying a write signal to the write magnetic head element.

In this type of conventional head suspension assembly, two read signal conductor patterns are arranged adjacent to each other and in close proximity to each other.
The two write signal conductor patterns are arranged adjacent to each other and in parallel with each other. in this way,
Conventionally, it has been considered that two conductor patterns in which the same signal reciprocates should be arranged as a pair with each other.

Further, in the conventional head suspension assembly as described above, most of the two write signal conductor patterns is one of the two regions of the suspension with the central axis line in the longitudinal direction of the suspension as a boundary. However, the arrangement of the write signal conductor patterns was uneven.

[0005]

By the way, in the conventional head suspension assembly as described above, since the conductor pattern is usually formed on the metal plate via the insulating layer, the conductor pattern and the ground (metal plate) are formed. The stray capacitance between and is regarded as a problem as a factor that reduces the write data transfer rate and the read data transfer rate, and measures have been taken against it.

For example, in Japanese Unexamined Patent Publication No. 9-282624, an equivalent circuit of a circuit composed of a read magnetic head element and two read signal conductor patterns, and a write magnetic head element and two write signal conductors. An equivalent circuit of a circuit composed of patterns is disclosed, and the limit of the stray capacitance on the data transfer rate is analyzed. In this analysis, stray capacitance C between the conductor pattern and ground
Focusing on the fact that a resonance phenomenon occurs due to the parasitic inductance of the conductor pattern and the inductance component of the magnetic head element (the total inductance of the two is L), the resonance frequency f ₀ determines the limit of the data transfer rate. I am trying. The resonance frequency f ₀ is represented by the following formula 1. This analysis discusses frequency limitation due to resonance phenomena.

[0007]

## EQU1 ## f ₀ = 1 / {2π (LC) ^1/2 }

In Japanese Patent Laid-Open No. 9-228624, based on the analysis, the conductor is removed by removing a part of the metal plate below the conductor pattern in order to improve the write data transfer rate and the read data transfer rate. A technique for reducing stray capacitance between the pattern and the ground is disclosed.

However, as a result of the research conducted by the present inventor, the above-described analysis is appropriate when the resistance component (internal resistance) of the magnetic head element is small, but when the resistance component of the magnetic head element is large, It has been found that it is necessary to consider the CR low-pass filter effect constituted by the capacitance component having the resistance of the head element and the capacitance component formed by the conductor pattern.

This point will be described with reference to FIG. FIG. 19 is a circuit diagram showing an equivalent circuit on the read side of the head suspension assembly. In FIG. 19, 100 is an equivalent circuit of a read magnetic head element, 1
Reference numeral 01 denotes an equivalent circuit of two read signal conductor patterns. R ₀ , C ₀ , and L ₀ are the resistance component, capacitance component, and inductance component of the read magnetic head element, respectively. RL and LL are the resistance component and the inductance component of one read signal conductor pattern, respectively. CLL is a stray capacitance between two read signal conductor patterns, and CLS is a stray capacitance between one read signal conductor pattern and the ground.

As shown in FIG. 19, the read magnetic head element has a resistance component R ₀ and a capacitance component C ₀ to form a CR low-pass filter, and the stray capacitances CLL and CLS of these and the suspension are C. _By being connected in parallel to ₀ , a CR low-pass filter having a large C component is configured. In order to see the effect of the CR low-pass filter, the cutoff frequency fc of the CR low-pass filter is calculated by ignoring the inductance components L ₀ and LL. At this time, since the resistance component RL of the read signal conductor pattern is smaller than the resistance component R ₀ of the read magnetic head element, it can be ignored in the calculation. The capacitance component Ctotal existing in the entire circuit shown in FIG. 19 viewed from the resistance component R ₀ of the read magnetic head element is expressed by the following formula 2
The cutoff frequency fc is expressed by the following expression 3.

[0012]

[Equation 2] Ctotal = C ₀ + CLL + 0.5 (CLS + CLS)
= C ₀ + CLL + CLS

[0013]

## EQU3 ## fc = 1 / 2πR ₀ Ctotal

The read data transfer rate cannot exceed the cutoff frequency fc. As can be seen from Equation 3, the cutoff frequency fc decreases as the resistance component R ₀ of the read magnetic head element increases. Therefore,
When the resistance component R ₀ of the read magnetic head element becomes larger than a certain value, fc ≦ f ₀ , and the limit of the read data transfer rate is determined by the cutoff frequency fc of the CR low pass filter. As described above, when the resistance component R ₀ of the read magnetic head element is large, C
Since the effect of the R low-pass filter becomes dominant to the read data transfer frequency limit, the method disclosed in Japanese Patent Laid-Open No. 9-28262
The analysis disclosed in Japanese Patent No. 4 is not always appropriate. On the other hand, when the resistance component R ₀ of the read magnetic head element is small, fc> f ₀ , and the limit of the read data transfer rate is determined by the resonance frequency f ₀ described above. As described above, since the effect of the resonance becomes dominant in the read data transfer frequency limit, when the resistance component R ₀ of the read magnetic head element is small, JP-A-9-282 is used.
The analysis disclosed in Japanese Patent No. 624 is appropriate.

Therefore, in the above-mentioned conventional suspension assembly, the read magnetic head element is a normal 30
In the case of a GMR element (giant magnetoresistive effect element) having a resistance component of about Ω to 40Ω, although the read data transfer rate can be improved, the read magnetic head element is, for example, a TMR element (tunnel junction magnetoresistive effect). In the case of an element having a large resistance component such as an element), the read data transfer rate could not be sufficiently increased. In particular, in the case of a TMR element or the like, if the track is narrowed to increase the recording density, the resistance component increases, so that it is difficult to increase the read data transfer rate.

Although the above description was for the circuit on the read side, the same applies in principle to the circuit on the write side. However, an inductive magnetic conversion element is usually used as the write magnetic head element, and the resistance component of this element is small, so that the effect of the resonance becomes dominant in the read data transfer frequency limit. Therefore, the write data transfer rate can be increased even with the conventional suspension assembly.

By the way, the conventional head suspension assembly has a problem due to thermal displacement caused by a write signal. That is, when writing data on the magnetic recording medium, the write current is, for example, 40 mA to 50 mA.
Since it is about mA, heat is generated considerably due to the resistance component of the write signal conductor pattern. In the conventional head suspension assembly, since the arrangement of the write signal conductor patterns is uneven as described above, a temperature difference is generated between the left and right sides of the suspension, and a difference in the amount of expansion occurs between the left and right sides.
As a result, the suspension is deformed to the left and right, and the magnetic head is displaced from a desired position with an amount of displacement that cannot be ignored from the track width and track spacing that have been reduced as the recording density is increased. Such a displacement of the magnetic head is servo-controlled so that the position of the head follows the track during normal use of the magnetic disk device, so if the adjustment range of the control is sufficiently large,
It doesn't really matter. However, for example, in the process of applying a write signal to the write magnetic head element to continuously write a servo signal on the magnetic recording medium, which is performed in the final stage of manufacturing a magnetic disk device or the like, the intention of the magnetic head in the track width direction is increased. If the displacement does not occur, serious problems may occur.

The present invention has been made in view of the above-described situation, and a head suspension assembly and a head suspension assembly capable of increasing the read data transfer speed even if the read magnetic head element has a large resistance component. It is an object of the present invention to provide a used magnetic disk device.

It is another object of the present invention to provide a head suspension assembly and a magnetic disk device using the same, which can reduce lateral displacement of the magnetic head due to heat generated by a write signal. .

Further, according to the present invention, even if the read magnetic head element has a large resistance component, the read data transfer rate can be increased and the magnetic head can be moved to the left and right due to the heat generated by the write signal. It is an object of the present invention to provide a head suspension assembly and a magnetic disk drive using the same, which can reduce the displacement of the head suspension assembly.

[0021]

In order to solve the above-mentioned problems, a head suspension assembly according to a first aspect of the present invention is a magnetic device having a slider and a read magnetic head element and a write magnetic head element provided on the slider. A head and a suspension that mounts the magnetic head near the tip end thereof and supports the magnetic head are provided. The suspension has first and second conductor patterns for obtaining a read signal from the read magnetic head element, and third and fourth conductor patterns for supplying a write signal to the write magnetic head element.
And a conductor pattern of. The first to fourth conductor patterns are substantially parallel to each other in at least a partial section between a position where the magnetic head is mounted in the suspension and a vicinity of a base end portion of the suspension, and are substantially parallel to each other. It extends in the length direction.
At least one of the first to fourth conductor patterns
One conductor pattern is located in the first region of the first and second regions of the suspension with the central axis in the longitudinal direction of the suspension as a boundary in the partial section. The remaining conductor patterns of the first to fourth conductor patterns are located in the second region. Of the first to fourth conductor patterns, the conductor pattern located closest to the central axis in the first region, and the most conductor pattern of the first to fourth conductor patterns in the second region. An interval between the conductor patterns located on the central axis side is wider than an interval between adjacent conductor patterns in the first or second region. The first conductor pattern is located in the first region, and the second conductor pattern is located in the second region. The at least part of the section may be, for example, a section excluding a portion in which it is substantially difficult to secure a region for disposing the conductor pattern near the base end portion of the suspension. This point is the same for the sixth mode described later.

In the first aspect, unlike the conventional layout in which the two read signal conductor patterns are arranged adjacent to each other and in close proximity to each other, the two read signal conductor patterns (the aforementioned The first and second conductor patterns) are arranged in the first and second regions, respectively, in the at least a part of the section, and the distance between the two becomes wide. Therefore, in the first aspect, the line stray capacitance between the two read signal conductor patterns is smaller than that in the conventional case. Therefore, according to the first aspect,
As can be seen from Equations 2 and 3, the C component included in the read magnetic head element and the line stray capacitance between the two read signal conductor patterns connected in parallel to the C component are formed. Since the C component of the CR low pass filter becomes small, the cutoff frequency fc of the CR low pass filter becomes high. As a result, according to the first aspect,
Even if the read magnetic head element has a large resistance component, the read data transfer rate can be increased.

By the way, from the above equations 2 and 3, 2
The stray capacitance CLL between the read signal conductor patterns of the book is twice as effective as the stray capacitance CLS between the read signal conductor pattern and the ground with respect to the cutoff frequency fc of the CR low-pass filter. I understand.
Therefore, as in the first aspect, it is possible to reduce the stray capacitance between the two read signal conductor patterns,
It is preferable for increasing the cutoff frequency fc of the CR low pass filter.

A head suspension assembly according to a second aspect of the present invention is the head suspension assembly according to the first aspect, wherein the read magnetic head element is a tunnel junction magnetoresistive effect element (TMR element).

In the first aspect, the read magnetic head element is not particularly limited. But TMR
The element generally has a relatively large resistance component,
When the recording density is increased, the resistance component increases, so that the read magnetic head element is TM-type as in the second aspect.
With the R element, the effect of increasing the read data transfer rate becomes significant.

A head suspension assembly according to a third aspect of the present invention is the head suspension assembly according to the first or second aspect, wherein the read magnetic head element has a resistance component of 100Ω or more.

When the read magnetic head element has a resistance component of 100Ω or more as in the third mode, the effect of increasing the read data transfer rate becomes remarkable. The read magnetic head element may have a resistance component of 200Ω or more, or may have a resistance component of 300Ω or more.
In these cases, the effect of increasing the read data transfer rate becomes more remarkable.

A head suspension assembly according to a fourth aspect of the present invention is the head suspension assembly according to any one of the first to third aspects, wherein the third conductor pattern is located in the first region, and The conductor pattern of is located in the second region.

According to the fourth aspect, unlike the conventional layout in which two write signal conductor patterns are arranged adjacent to each other and in parallel with each other, 2
The write signal conductor patterns (third and fourth conductor patterns) of the book are arranged in the first and second regions, respectively, and the arrangement of both approaches a symmetrical arrangement with respect to the central axis. Therefore, even if heat is generated by the write signal, the difference between the expansion amounts on both sides with respect to the central axis is small, so that the lateral displacement of the magnetic head due to the heat generated by the write signal can be reduced.

A head suspension assembly according to a fifth aspect of the present invention is the head suspension assembly according to any one of the first to fourth aspects, wherein: (a) the read magnetic head is provided on a side surface of the slider on the front end side of the suspension. First and second bonding pads connected to the element and third and fourth bonding pads connected to the write magnetic head element are formed so as to be aligned in a direction along the surface of the suspension, (B) The first
Thru the fourth bonding pad is divided into two first and second groups from one side, the first group connecting the first and third bonding pads in this order or vice versa. In addition, the second group includes the second and fourth bonding pads in this order or in the reverse order.

According to the fifth aspect, the arrangement of the first to fourth bonding pads of the magnetic head is determined as described above, so that the first to fourth aspects of the first to fourth aspects are arranged. The layout of the fourth conductor pattern can be realized without adopting the three-dimensional intersection of the conductor patterns such as in a multilayer printed board. Therefore,
According to the fifth aspect, the structure is simple and inexpensive.

A head suspension assembly according to a sixth aspect of the present invention is a slider and a magnetic head having a read magnetic head element and a write magnetic head element provided on the slider, and the magnetic head is mounted near the tip. And a suspension that supports the magnetic head. The suspension has first and second conductor patterns for obtaining a read signal from the read magnetic head element, and third and fourth conductor patterns for supplying a write signal to the write magnetic head element. And a pattern. The first to fourth conductor patterns are provided in at least a partial section between the vicinity of the position where the magnetic head is mounted in the suspension and the vicinity of the base end portion of the suspension.
The suspensions extend substantially in the longitudinal direction of the suspension while being substantially parallel to each other. At least one conductor pattern of the first to fourth conductor patterns is provided in the first and second regions of the suspension with the central axis line in the longitudinal direction of the suspension as a boundary in the partial section. Located within the first region of the. The remaining conductor patterns of the first to fourth conductor patterns are located in the second region. Of the first to fourth conductor patterns, the conductor pattern located closest to the central axis in the first region, and the most conductor pattern of the first to fourth conductor patterns in the second region. An interval between the conductor patterns located on the central axis side is wider than an interval between adjacent conductor patterns in the first or second region. The third conductor pattern is located in the first region, and the fourth conductor pattern is located in the second region.

According to the sixth aspect, unlike the conventional layout in which the two write signal conductor patterns are arranged adjacent to each other and in close proximity to each other, 2
The write signal conductor patterns (third and fourth conductor patterns) of the book are arranged in the first and second regions, respectively, and the arrangement of both approaches a symmetrical arrangement with respect to the central axis. Therefore, even if heat is generated by the write signal, the difference between the expansion amounts on both sides with respect to the central axis is small, so that the lateral displacement of the magnetic head due to the heat generated by the write signal can be reduced.

A head suspension assembly according to a seventh aspect of the present invention is the head suspension assembly according to any one of the fourth to sixth aspects, wherein the third and fourth conductor patterns are symmetrical with respect to the central axis in the partial section. It is arranged in a special way.

According to the seventh aspect, since the two write signal conductor patterns (the third and fourth conductor patterns) are symmetrically arranged with respect to the central axis, heat generated by the write signal is generated. It is possible to further reduce the displacement of the magnetic head to the left and right due to.

The head suspension assembly according to an eighth aspect of the present invention is the head suspension assembly according to any one of the first to seventh aspects, wherein the first conductor pattern is within the first region. The first and the first conductor patterns are arranged so as not to be adjacent to any of the conductor patterns, and the second conductor pattern is not adjacent to any of the third and fourth conductor patterns in the second region. 1 in either or both of the two areas
One or more shield conductor patterns are arranged.

According to the eighth aspect, it is preferable that the shield conductor pattern reduces crosstalk between the write signal and the read signal.

A head suspension assembly according to a ninth aspect of the present invention is the head suspension assembly according to any one of the first to seventh aspects, wherein the suspension has a flexure on which the magnetic head is mounted and a pressing force applied to the slider for supporting the flexure. And a load beam for imparting a load beam, and the first to fourth conductor patterns are formed on the flexure.

A head suspension assembly according to a tenth aspect of the present invention is the head suspension assembly according to the eighth aspect, wherein the suspension supports the flexure, and supports the flexure to apply a pressing force to the slider. A load beam, and the first to fourth conductor patterns and the one or more shield conductor patterns are formed on the flexure.

The ninth and tenth aspects are examples in which the suspension has the load beam and the flexure. However, the first to eighth
In this aspect, for example, the suspension may be configured by a member having both the functions of the load beam and the flexure. In that case, the first member
The fourth conductor pattern and the shield conductor pattern may be formed.

A magnetic disk drive according to an eleventh aspect of the present invention is a magnetic disk device, wherein the head suspension assembly according to any one of the first to tenth aspects, an arm portion for supporting the assembly, and an arm portion for moving the magnetic field. And an actuator for positioning the head.

According to the eleventh aspect, since the head suspension assembly according to any one of the first to tenth aspects is provided, even if the read magnetic head element has a large resistance component, the read data is read. The first effect that the transfer speed can be increased and / or the second effect that the lateral displacement of the magnetic head due to the heat generated by the write signal can be reduced can be obtained.

[0043]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A head suspension assembly according to the present invention and a magnetic disk device using the same will be described below with reference to the drawings.

[First Embodiment]

FIG. 1 is a schematic plan view showing a front end side portion of a head suspension assembly according to a first embodiment of the present invention as viewed from the magnetic recording medium facing surface side. Figure 2
FIG. 2 is a schematic plan view showing a base end side portion of the head suspension assembly shown in FIG. 1 as viewed from the magnetic recording medium facing surface side. The AA 'line in FIG. 1 and the AA' line in FIG. 2 indicate the same position of the head suspension assembly. FIG. 3A shows the magnetic head 1 shown in FIGS.
It is a schematic plan view which shows the flexure 6 which mounts. Figure 3
In (a), mainly the outer shapes of the magnetic head 1 and the flexure 6 are shown, and other notations are omitted. Figure 3 (b)
FIG. 3 is a schematic plan view showing the load beam 7 in FIGS. 1 and 2. FIG. 4 is a schematic perspective view showing a tip portion of the head suspension assembly shown in FIGS. 1 and 2. FIG. 5 is a schematic cross-sectional view taken along the line BB ′ in FIG.
FIG. 6 is a schematic sectional view taken along the line CC ′ in FIG. 1. FIG. 7 is a schematic cross-sectional view taken along the line DD ′ in FIG.

As shown in FIGS. 1 to 4, the head suspension assembly according to the first embodiment includes a magnetic head 1 and a suspension 2 in which the magnetic head 1 is mounted in the vicinity of a tip portion thereof and supports the magnetic head 1. Is equipped with.

As shown in FIG. 4, the magnetic head 1 has a slider 3, a TMR element 4 as a read magnetic head element, and an inductive magnetic conversion element 5 as a write magnetic head element. There is. The TMR element 4 is 100
It has a resistance component of Ω or more, for example, a resistance component of about 200Ω to 400Ω. Instead of the TMR element 4, for example, GM
Other elements such as an R element may be used, and the resistance component of the read magnetic head element is not necessarily limited to 100Ω or more. Although not shown in detail in the drawings, the magnetic head 1 is configured as a composite magnetic head by stacking the elements 4 and 5 on the side surface of the slider 3 on the tip side of the suspension 2. As shown in FIG.
On this side surface of the slider 3, two bonding pads r1 and r2 electrically connected to two points of the TMR element 4 and a bonding electrically connected to two points of the inductive magnetic conversion element 5, respectively. Pad w1,
The w2 is formed in the direction of the surface of the suspension 2 in the order of r1, w1, w2, and r2 from the + X side to the −X side in the drawing.

In the first embodiment, the suspension 2
1 to 3, the flexure 6 on which the magnetic head 1 is mounted and the magnetic head 1 supporting the flexure 6 are mounted.
A load beam 7 for applying a pressing force to the slider 3 and a base plate 8. In addition, the suspension 2 has a TMR as shown in FIGS. 1, 2, and 4 to 7.
First and second conductor patterns R1 and R2 for obtaining a read signal from the element 4, and third and fourth conductor patterns W1 and W2 for supplying a write signal to the inductive magnetic conversion element 5. I have it. In the first embodiment,
The conductor patterns R1, R2, W1 and W2 are the flexure 6
Is formed in. In FIGS. 1, 2, and 4, the conductor patterns R1, R2, W1, and W2 should originally be shown by hidden lines, but are shown by solid lines for easy understanding.

The flexure 6 is shown in FIGS. 1, 2 and 3.
As shown in (a), from the front end side to the base end side, it extends in a strip shape along the central axis O in the longitudinal direction of the suspension 2, and further extends in a strip shape on the + X side, and then in a strip shape parallel to the central axis O. Extends to. As shown in FIGS. 5 to 7, the flexure 6 includes, for example, a substrate 10 made of a thin stainless steel plate having a thickness of about 25 μm, and a thickness of about 1 formed on the substrate 10.
Insulating layer 11 consisting of 0 μm polyimide layer and insulating layer 1
Said conductor pattern R1, comprising a copper layer having a thickness of about 15 μm formed as a thin film pattern on 1
R2, W1, W2 and the thickness of about 3 formed on them
The protective layer 12 is made of a polyimide layer having a thickness of μm.

The tip portion of the flexure 6 is shown in FIGS.
As shown in (a), FIG. 4 and FIG. 7, the gimbal portion 14 is formed by forming the substantially U-shaped cutout groove 13 in plan view.
The magnetic head 1 is joined to the gimbal portion 14 with an adhesive or the like. As shown in FIG. 4, the bonding pads r1, r of the magnetic head 1 in the flexure 6 are
2, the conductor pattern R
Bonding pads R1 ′, R2 ′, W1 ′, W to which one ends of 1, R2, W1, W2 are electrically connected, respectively.
2'is formed respectively. 2 and 3
As shown in (a), on the base end side of the flexure 6, the bonding pads R1 ″, R2 ″, to which the other ends of the conductor patterns R1, R2, W1, W2 are electrically connected, respectively.
W1 ″ and W2 ″ are formed respectively. Although not shown in the drawing, these bonding pads are composed of, for example, a copper layer extending from the conductor patterns R1, R2, W1, W2, and a nickel layer and a gold layer sequentially laminated on the copper layer. The protective layer 12 is not formed thereon. Bonding pads R1 ', R of flexure 6
2 ′, W1 ′, W2 ′ are, for example, gold balls 15
The bonding pad r1, of the magnetic head 1
It is electrically connected to r2, w1, and w2.

The conductor patterns R1, R2, W1 and W2 are
As shown in FIGS. 1, 2, and 4, the flexures 6 extend substantially parallel to each other along the extending direction of the flexure 6 described above. As a result, as shown in FIG.
1, R2, W1 and W2 are part of a section (in the first embodiment, between the position where the magnetic head 1 is mounted (the position of the gimbal portion 14) and the base end portion of the suspension 2). In a section K extending from the vicinity of the tip of the flexure 6 along the central axis O), the flexures 6 extend substantially in the longitudinal direction (direction of the central axis O) of the suspension 2 in parallel with each other. In the section K, the read signal conductor pattern R1 and the write signal conductor pattern W1 are located in the + X side region of the suspension 2 with the central axis O as a boundary. On the other hand, in the section K, the read signal conductor pattern R2 and the write signal conductor pattern W2 are-
It is located in the area on the X side. In the section K, the write signal conductor patterns W1 and W2 are arranged symmetrically with respect to the central axis O. The read signal conductor patterns R1 and R2 are also arranged symmetrically with respect to the central axis O in the section K. A space between the conductor pattern R1 located closest to the central axis O in the + X side area of the section K and the conductor pattern R2 located closest to the central axis O in the -X side area of the section K. (For example, the minimum interval in section K is 0.3m
m) is a space (for example, 0.03 mm) between the conductor patterns R1 and W1 in the + X side region in the section K, and
Conductor patterns R2 and W in the -X side region in section K
Wider than the space between two (eg, 0.03 mm). Even if it is difficult to secure a sufficient space due to the problem of the layout of the suspension, the interval between the read signal conductor patterns R1 and R2 in the section K is the line distance between the read signal conductor patterns of the conventional layout. (For example, 0.03 mm) is preferably 4 times or more wider, and more preferably 10 times or more wider. If the distance between the conductor patterns R1 and R2 is 4 times or more or 10 times or more the line distance of the conventional layout, the line capacitance generated by the read signal conductor patterns R1 and R2 is 1/100 of the conventional value It can be suppressed to 4 or less or 1/10 or less. For example, the conductor patterns R1, R2, W2, W3
Has a width of 30 μm and a thickness of 15 μm to 18 μm.

The load beam 7 is, for example, about 60 μm-
It is formed of a relatively thick stainless steel plate of 80 μm. The load beam 7 is shown in FIGS. 1, 2 and 3 (b).
As shown in FIG. 3, the rigid portion 7 having a substantially triangular shape in plan view on the distal end side is formed.
a, the base plate joint portion 7b on the base end side, and the rigid portion 7
An elastic portion 7c located between a and the joint portion 7b for generating a pressing force applied to the slider 3 of the magnetic head 1 and a base end side portion of the flexure 6 extending laterally from the joint portion 7b. And a support portion 7d. In FIG. 3B, 7e is a bent upright portion (so-called box bending) for increasing the rigidity of the rigid portion 7a, 7f is a hole for adjusting the pressing force generated by the elastic portion 7c, and 7g is the slider 3 of the magnetic head 1.
Is a convex projection (dimple) for pressing the back surface of the. The dimple 7g abuts at a point substantially at the center of the gimbal portion 14 fixed to the back surface of the slider 3 and suppresses the slider 3 from moving in the direction of floating from the magnetic recording medium. The rigid portion 7a of the load beam 7 includes
As shown in, the flexure 6 is fixed at a plurality of spot welding points 21 by laser welding or the like. Further, the base plate 8 is fixed to the base plate joint portion 7b of the load beam 7 at a plurality of spot welding points 22 as shown in FIG. The base end side portion of the flexure 6 is
Load beam 7 protruding laterally from base plate 8
It is supported by the supporting portion 7d.

Further, in the first embodiment, FIG. 1 and FIG.
As shown in FIG. 6 and FIG.
According to the technique disclosed in Japanese Patent No. 4, the holes (removed portions) 10a are formed in a plurality of portions of the substrate 10 of the flexure 6 located below the conductor patterns R1, R2, W1, W2. The holes 10a reduce stray capacitance between the write signal conductor patterns W1 and W2 and the ground (the load beam 7 is kept at the ground level), thereby improving the write data transfer speed. In addition, the read signal conductor pattern R is formed by the hole 10a.
The stray capacitance CLS between 1, R2 and ground is reduced. As described above, the floating capacitive component is largely CLL,
It is divided into CLS, but between lines or ground C is C
= Ε (s / d). Here, d is the distance between lines or the ground, and s is the facing area. Since the conductor pattern has a width of about 30 μm and a thickness of about 15 μm, for example, the ground C is sufficiently large. The ratio contributing to the CR low-pass filter is CLL: CLS = 2: 1, but since the value of C is large, the hole 10a is formed by the CR formed by the TMR element 4 and the two read signal conductor patterns R1 and R2. This greatly contributes to the effect of increasing the cutoff frequency fc of the low pass filter. For this reason, it is more preferable to form the hole 10a.

The flexure 6 having the above-mentioned structure
Can be manufactured by a known method using various film forming techniques, a photolithography etching method, or the like.

The above-mentioned conductor patterns R1, R2, W1,
W2 and bonding pads r1 and r of the magnetic head 1
The layout of 2, w1 and w2 can be schematically shown as in FIG. FIG. 8 shows conductor patterns R1, R2, W1, of the head suspension assembly shown in FIGS.
W2 and bonding pads r1 and r of the magnetic head 1
It is a model figure which shows the arrangement | positioning of 2, w1, and w2 typically.

Here, as compared with the first embodiment,
FIG. 9 shows a comparative example corresponding to the conventional technique. FIG. 9 is a model diagram schematically showing the arrangement of the conductor patterns R1, R2, W1, W2 and the bonding pads r1, r2, w1, w2 of the magnetic head 1 of the head suspension assembly of this comparative example. It corresponds. The difference of this comparative example from the first embodiment is that the positions of the write signal conductor pattern W1 and the read signal conductor pattern are changed by exchanging the positions of the bonding pads w1 and the bonding pads r2 of the magnetic head 1. Only the point where the position of R2 is replaced. Therefore, in this comparative example, in the area on the + X side in the section K, the two read signal conductor patterns R1 and R2 are adjacent to each other and are adjacent and parallel to each other. Also, in this comparative example,
In the region on the −X side in the section K, the two write signal conductor patterns W1 and W2 are adjacent to each other and are adjacent and parallel to each other.

In the comparative example shown in FIG.
While the distance between the read signal conductor patterns R1 and R2 is narrow, in the first embodiment, as shown in FIG. 8, between the two read signal conductor patterns R1 and R2, as shown in FIG. The intervals are very wide. Therefore, according to the first embodiment, the stray capacitance between the two read signal conductor patterns R1 and R2 is significantly smaller than that in the comparative example shown in FIG. Therefore, according to the first embodiment, as can be seen from the equations 2 and 3, the TMR
Element 4 and two read signal conductor patterns R1, R
The cut-off frequency fc of the CR low-pass filter constituted by 2 becomes high. As a result, according to the first embodiment, although the TMR element 4 has a large resistance component, the read data transfer rate can be increased as compared with the comparative example shown in FIG.

Further, in the comparative example shown in FIG. 9, the two write signal conductor patterns W1 and W2 are-
In the first embodiment, as shown in FIG. 8, the two write signal conductor patterns W1 and W2 are located in the + X side region in the section K and in the X side region. The patterns W1 and W2 are arranged in the −X side region, respectively, and the patterns W1 and W2 are arranged symmetrically with respect to the central axis O in the section K. Therefore, in the comparative example shown in FIG. 9, the magnetic head 1 is largely displaced to the left and right (± X direction in the drawing) due to the heat generated by the write signal, whereas in the first embodiment, the write signal is changed. The lateral displacement of the magnetic head 1 due to the heat generated by the can be significantly reduced.

[Second Embodiment]

FIG. 10 shows a conductor pattern R of the head suspension assembly according to the second embodiment of the present invention.
1, R2, W1, W2 and the bonding pads r1, r2, w1, w2 of the magnetic head 1 are schematic model diagrams corresponding to FIG.

The second embodiment differs from the first embodiment (see FIG. 8) in that the positions of the bonding pads w1 and w2 of the magnetic head 1 and the bonding pads r1 and
Only the positions of the write signal conductor patterns W1 and W2 and the positions of the read signal conductor patterns R1 and R2 are interchanged by exchanging the positions of r2.

The same advantages as those of the first embodiment can also be obtained by the second embodiment.

[Third Embodiment]

FIG. 11 shows a conductor pattern R of a head suspension assembly according to the third embodiment of the present invention.
1, R2, W1, W2 and the bonding pads r1, r2, w1, w2 of the magnetic head 1 are schematic model diagrams corresponding to FIG.

The difference of the third embodiment from the first embodiment (see FIG. 8) is that the position of the bonding pad w1 of the magnetic head 1 and the position of the bonding pad r1 are exchanged to write a write signal. The only difference is that the positions of the conductor patterns W1 for read and the positions of the conductor patterns R1 for read signal are exchanged.

The same advantages as those of the first embodiment can also be obtained by the third embodiment. However, in the third embodiment, two write signal conductor patterns W are used.
Since 1 and W2 are not perfectly symmetrically arranged with respect to the central axis O in the section K, as compared with the first embodiment, the lateral displacement of the magnetic head 1 caused by the heat generated by the write signal is caused. Will be slightly larger.

[Fourth Embodiment]

FIG. 12 shows a conductor pattern R of a head suspension assembly according to the fourth embodiment of the present invention.
1, R2, W1, W2 and the bonding pads r1, r2, w1, w2 of the magnetic head 1 are schematic model diagrams corresponding to FIGS. 8 and 9.

The difference of the fourth embodiment from the comparative example shown in FIG. 9 is that the read signal conductor pattern R2 is arranged not in the + X side region but in the −X region in the section K, and the write signal is formed. It is only a point that is arranged so as to be adjacent to and adjacent to and parallel to the conductor pattern W1.

According to the fourth embodiment, the two write signal conductor patterns W1 and W2 are -X in the section K.
Since it is unevenly distributed in the side area, the magnetic head 1 is at the left and right sides (± X direction in the figure) due to the heat generated by the write signal.
However, since the distance between the two read signal conductor patterns R1 and R2 is extremely wide in the section K, the stray capacitance between the two read signal conductor patterns R1 and R2 is increased. The read data transfer speed can be increased significantly.

[Fifth Embodiment]

FIG. 13 shows a conductor pattern R of a head suspension assembly according to the fifth embodiment of the present invention.
1, R2, W1, W2 and the bonding pads r1, r2, w1, w2 of the magnetic head 1 are schematic model diagrams corresponding to FIGS. 8 and 9.

The fifth embodiment is different from the comparative example shown in FIG. 9 in that the write signal conductor pattern W1 is arranged in the + X region in the section K instead of the -X side region, and the read signal is formed. It is only a point that is arranged so as to be adjacent to and adjacent to and parallel to the conductor pattern R2.

According to the fifth embodiment, since the two read signal conductor patterns R1 and R2 are close to each other,
Although the stray capacitance between the read signal conductor patterns R1 and R2 cannot be reduced, the two write signal conductor patterns W1 and W2 are provided in the + X side region and the −X side region in the section K, respectively. Since they are arranged, both of them are close to the symmetrical arrangement with respect to the central axis O, and the lateral displacement of the magnetic head 1 due to the heat generated by the write signal can be reduced.

[Sixth Embodiment]

FIG. 14 is a schematic plan view showing the tip side portion of the head suspension assembly according to the sixth embodiment of the present invention, as seen from the magnetic recording medium facing surface side. Figure 1
FIG. 5 is a schematic plan view showing a base end side portion of the head suspension assembly shown in FIG. 14 as seen from the magnetic recording medium facing surface side. E-E 'line in FIG. 14 and E- in FIG.
The E'line shows the same position of the head suspension assembly. FIG. 16 is a schematic sectional view taken along the line FF ′ in FIG. FIG. 17 is a schematic cross-sectional view taken along the line GG ′ in FIG. In these figures, FIG.
The same or corresponding elements as those in FIG. 7 are designated by the same reference numerals, and their duplicate description will be omitted.

The sixth embodiment differs from the first embodiment only in the points described below. That is, in the sixth embodiment, as shown in FIGS. 14 to 17, between the read signal conductor pattern R1 and the write signal conductor pattern W1 located in the + X side region in the section K, The shield conductor pattern S1 is arranged over substantially the entire length of the patterns R1 and W1. Further, between the read signal conductor pattern R2 and the write signal conductor pattern W2 located in the -X side area in the section K, the shield conductor pattern S2 is provided over almost the entire length of the patterns R2 and W3. It is arranged. As shown in FIGS. 16 and 17, the conductor patterns S1, S2
Is formed on the flexure 6 as a copper layer like the other conductor patterns R1, R2, W1 and W2.

On the base end side of the flexure 6, as shown in FIG. 15, connection pads S1 "and S2" to which one ends of the conductor patterns S1 and S2 are electrically connected are formed, respectively. The connection pads S1 ″, S2 ″ have the same structure as the other bonding pads R1 ″, R2 ″, W1 ″,
This is similar to W2 ″. The shield pads S1 ″ and S2 ″ are connected to the ground by using the connection pads S1 ″ and S2 ″. For example, the connection pads S1 ″ and S2 ″ are preamplifiers that form an external circuit. , Or the substrate 10 of the load beam 7 or the flexure 6. The substrate 10 of the load beam 7 and the flexure 6 is connected to the ground, and for example, the connection pad S1. Instead of ", S2", in those parts,
By removing the insulating layer 11 of the flexure 6, the conductor pattern S
The copper layers extending from 1, S2 may be connected to the substrate 10 of the flexure 6. In this case, the protective layer 12 may be formed on the copper layer in those portions.

According to the sixth embodiment, in addition to the same advantages as those of the first embodiment, the conductor patterns S1 and S2 for shielding are added, so that the current of the write signal is changed to the conductor pattern. Read signal conductor patterns R1 and R2 due to electromagnetic waves generated when flowing through W1 and W2
There is also the advantage that crosstalk to is reduced.

Although the sixth embodiment is a modification of the first embodiment, the present invention applies the same modifications as the above-mentioned second to fifth embodiments. Good. That is, the shield conductor patterns corresponding to the shield conductor patterns S1 and S2 are provided between the conductor patterns R1 and W1 and between the conductor patterns R2 and W2 in the case of FIG. 10 and in the case of FIG. In the case of 13, it may be added between the conductor patterns R2 and W1.

[Seventh Embodiment]

FIG. 18 is a schematic perspective view showing the structure of the main part of a magnetic disk device according to the seventh embodiment of the present invention.

The magnetic disk device according to the seventh embodiment includes a magnetic disk 71 rotatably provided around a shaft 70, a magnetic head 72 for recording and reproducing information on the magnetic disk 71, and a magnetic disk. An assembly carriage device 73 for positioning the head 72 on the track of the magnetic disk 71.

The assembly carriage device 73 includes a shaft 74.
A carriage 75 rotatable about the center of the carriage 75 and a voice coil motor (V
It is mainly composed of an actuator 76 made of CM).

A base of a plurality of drive arms 77 stacked in the direction of the shaft 74 is attached to the carriage 75, and the magnetic head 7 is attached to the tip of each drive arm 77.
A head suspension assembly 78 carrying 2 is fixed. Each head suspension assembly 7
8 is a drive arm 7 so that the magnetic head 72 at the tip thereof faces the surface of each magnetic disk 71.
It is provided at the tip of 7.

In the seventh embodiment, as the head suspension assembly 72, any one of the head suspension assemblies according to the above-described first to sixth embodiments and their modifications is mounted. Therefore, according to the seventh embodiment, even if the read magnetic head element has a large resistance component, the first advantage that the read data transfer rate can be increased and / or the write signal is generated. The second advantage that the lateral displacement of the magnetic head due to heat can be reduced can be obtained.

Although the respective embodiments of the present invention and their modifications have been described above, the present invention is not limited to these.

For example, although the suspension 2 has the load beam 7 and the flexure 6 in each of the above-described embodiments, the present invention provides a head suspension in which the suspension is formed by using a member that serves as both the load beam and the flexure. It can also be applied to assemblies.

[0089]

As described above, according to the present invention,
Even if the read magnetic head element has a large resistance component, the read data transfer rate can be increased.
A head suspension assembly and a magnetic disk device using the head suspension assembly can be provided.

Further, according to the present invention, it is possible to provide a head suspension assembly and a magnetic disk drive using the same, which can reduce the lateral displacement of the magnetic head due to the heat generated by the write signal. .

Further, according to the present invention, even if the read magnetic head element has a large resistance component, the read data transfer rate can be increased and the magnetic head can be moved to the left and right of the magnetic head due to the heat generated by the write signal. It is possible to provide a head suspension assembly and a magnetic disk device using the same, which can reduce the displacement of the head suspension assembly.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing a front end side portion of a head suspension assembly according to a first embodiment of the invention as seen from a magnetic recording medium facing surface side.

2 is a schematic plan view showing a base end side portion of the head suspension assembly shown in FIG. 1 as viewed from the magnetic recording medium facing surface side.

FIG. 3 is a schematic plan view showing a flexure and a load beam on which the magnetic head shown in FIGS. 1 and 2 is mounted.

4 is a schematic perspective view showing a tip portion of the head suspension assembly shown in FIGS. 1 and 2. FIG.

5 is a schematic cross-sectional view taken along the line BB ′ in FIG.

FIG. 6 is a schematic cross-sectional view taken along the line CC ′ in FIG.

7 is a schematic cross-sectional view taken along the line DD 'in FIG.

8 is a model diagram schematically showing an arrangement of conductor patterns and bonding pads of a magnetic head of the head suspension assembly shown in FIGS. 1 and 2. FIG.

FIG. 9 is a model diagram schematically showing an arrangement of conductor patterns of a head suspension assembly and a bonding pad of a magnetic head of a comparative example.

FIG. 10 is a model diagram schematically showing an arrangement of conductor patterns of a head suspension assembly and bonding pads of a magnetic head according to a second embodiment of the present invention.

FIG. 11 is a model diagram schematically showing an arrangement of a conductor pattern of a head suspension assembly and a bonding pad of a magnetic head according to a third embodiment of the present invention.

FIG. 12 is a model diagram schematically showing an arrangement of conductor patterns of a head suspension assembly and a bonding pad of a magnetic head according to a fourth embodiment of the present invention.

FIG. 13 is a model diagram schematically showing an arrangement of a conductor pattern of a head suspension assembly and a bonding pad of a magnetic head according to a fifth embodiment of the present invention.

FIG. 14 is a schematic plan view showing a front end side portion of a head suspension assembly according to a sixth embodiment of the invention, as seen from the magnetic recording medium facing surface side.

FIG. 15 is a schematic plan view showing a base end side portion of the head suspension assembly shown in FIG. 14 viewed from the magnetic recording medium facing surface side.

16 is a schematic cross-sectional view taken along the line FF ′ in FIG.

17 is a schematic cross-sectional view taken along the line GG ′ in FIG.

FIG. 18 is a schematic perspective view showing a configuration of a main part of a magnetic disk device according to a seventh embodiment of the present invention.

FIG. 19 is a circuit diagram showing an equivalent circuit on the read side of the head suspension assembly.

[Explanation of symbols]

1 magnetic head 2 suspension 3 slider 4 TMR element 5 Induction type magnetic conversion element 6 flexure 7 Road beam 8 base plate R1, R2 Read signal conductor pattern W1, W2 Write signal conductor pattern r1, r2, w1, w2 bonding pad

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Norikazu Ota             1-13-1, Nihonbashi, Chuo-ku, Tokyo             -In DC Inc. F-term (reference) 5D042 NA01 PA01 PA05 PA09 TA07                 5D059 AA01 BA01 CA14 CA29 DA01                       DA36 EA08

Claims (11)

[Claims] 1. A magnetic head having a slider, a read magnetic head element and a write magnetic head element provided on the slider, and a suspension for mounting the magnetic head near a tip end thereof and supporting the magnetic head. The suspension has first and second conductor patterns for obtaining a read signal from the read magnetic head element, and third and fourth conductor patterns for supplying a write signal to the write magnetic head element. And the first to fourth conductor patterns are substantially parallel to each other in at least a partial section between the vicinity of the position where the magnetic head is mounted in the suspension and the vicinity of the base end portion of the suspension. And extending substantially in the length direction of the suspension, At least 1
One conductor pattern is located in the first region of the first and second regions of the suspension with the central axis of the suspension in the longitudinal direction as a boundary in the partial section; The remaining conductor patterns of the to fourth conductor patterns are located in the second region, and are located closest to the central axis in the first region of the first to fourth conductor patterns. The positioned conductor pattern and the second conductor pattern of the first to fourth conductor patterns.
The distance between the conductor patterns located closest to the central axis in the region is wider than the distance between adjacent conductor patterns in the first or second region, and the first conductor pattern is The head suspension assembly, wherein the second suspension pattern is located in the first area and the second conductor pattern is located in the second area. 2. The head suspension assembly according to claim 1, wherein the read magnetic head element is a tunnel junction magnetoresistive effect element. 3. The read magnetic head element is 100
The head suspension assembly according to claim 1, which has a resistance component of Ω or more. 4. The third conductor pattern is located in the first region, and the fourth conductor pattern is located in the second region. The head suspension assembly according to any one of claims. 5. The first and second bonding pads connected to the read magnetic head element and the third and third connected to the write magnetic head element are provided on a side surface of the slider on the tip side of the suspension. Fourth
Bonding pads are formed so as to be aligned in a direction along the surface of the suspension, and the first to fourth bonding pads are divided into two first and second groups from one side. And the first group includes the first and third bonding pads in this order or in reverse order, and the second group includes the second and fourth bonding pads in this order or reverse. The head suspension assembly according to any one of claims 1 to 4, wherein the head suspension assembly is included in the order of. 6. A magnetic head having a slider, a read magnetic head element and a write magnetic head element provided on the slider, and a suspension for mounting the magnetic head near a tip end portion and supporting the magnetic head. The suspension has first and second conductor patterns for obtaining a read signal from the read magnetic head element, and third and fourth conductor patterns for supplying a write signal to the write magnetic head element. And the first to fourth conductor patterns are substantially parallel to each other in at least a partial section between the vicinity of the position where the magnetic head is mounted in the suspension and the vicinity of the base end portion of the suspension. And extending substantially in the length direction of the suspension, At least 1
One conductor pattern is located in the first region of the first and second regions of the suspension with the central axis of the suspension in the longitudinal direction as a boundary in the partial section; The remaining conductor patterns of the to fourth conductor patterns are located in the second region, and are located closest to the central axis in the first region of the first to fourth conductor patterns. The positioned conductor pattern and the second conductor pattern of the first to fourth conductor patterns.
The distance between the conductor patterns located closest to the central axis in the area is wider than the distance between adjacent conductor patterns in the first or second area, and the third conductor pattern is A head suspension assembly, characterized in that it is located in a first area and the fourth conductor pattern is located in a second area. 7. The head suspension assembly according to claim 4, wherein the third and fourth conductor patterns are arranged symmetrically with respect to the central axis in the partial section. . 8. The first conductor pattern does not adjoin any of the third and fourth conductor patterns in the first region, and the second conductor pattern is the second conductor pattern. One or more shield conductor patterns are provided in either one or both of the first and second regions so as not to be adjacent to any of the third and fourth conductor patterns in the region. The head suspension assembly according to claim 1, wherein the head suspension assembly is arranged. 9. The suspension includes a flexure on which the magnetic head is mounted, and a load beam that supports the flexure and applies a pressing force to the slider, and the first to fourth conductor patterns include the flexure. The head suspension assembly according to claim 1, wherein the head suspension assembly is formed in a flexure. 10. The suspension has a flexure on which the magnetic head is mounted, and a load beam that supports the flexure and applies a pressing force to the slider,
9. The head suspension assembly according to claim 8, wherein the first to fourth conductor patterns and the one or more shield conductor patterns are formed on the flexure. 11. A head suspension assembly according to claim 1, an arm portion that supports the assembly, and an actuator that moves the arm portion to position a magnetic head. Magnetic disk device characterized by.