JP2777454B2 - Magnetic head assembly and method of manufacturing the same - Google Patents

Description

[Description] The present invention relates to a magnetic head assembly used in a magnetic disk drive and the like and a method of manufacturing the same, which can reduce the influence of external noise as much as possible and can improve the yield of the magnetic head. To provide a head assembly, a slider having a magnetic head, a gimbal and a spring arm supporting the slider, and a write signal supplied to the magnetic head and an amplified read signal from the magnetic head. And a head IC, wherein the head IC is fixedly attached to the spring arm in a state capable of laser trimming.

[Industrial applications]

The present invention relates to a magnetic head assembly used for a magnetic disk drive and the like, and a method for manufacturing the same.

2. Description of the Related Art In recent years, with the increase in capacity and miniaturization of magnetic disk devices, a reduction in mounting space for electronic components in a disk enclosure has been required. In addition, it is strongly desired that the read signal output from the head IC has uniform output characteristics for high-precision waveform equalization performed later.

[Conventional technology]

In a conventional magnetic disk drive, a slider having a magnetic head is supported by a gimbal and a spring arm, and these are attached to an access arm that can be accessed in the radial direction of the magnetic disk. And a head IC for supplying a write signal to the magnetic head and amplifying a read signal from the magnetic head.
Is mounted on the access arm via FPC (Flexible Print Circuit) etc.
No. 150130).

[Problems to be solved by the invention]

In the conventional magnetic head assembly described above, the head IC
Is mounted on the access arm, which requires a space for it, which reduces the degree of freedom in designing the access arm and hinders miniaturization.

In addition, the transmission path of the weak signal input from the magnetic head to the head IC cannot be shortened because it is affected by the shape of the access arm and spring arm, so it is susceptible to external noise and is resistant to noise. Has the disadvantage of being low.

In general, the characteristics of magnetic heads are different from each other. Therefore, in manufacturing a magnetic disk drive, it is necessary to select magnetic heads having uniform characteristics when assembling a magnetic head assembly. Therefore, in a thin-film magnetic head, usually, two magnetic heads are formed on a slider, and a magnetic head having characteristics close to a reference value is selected from the two magnetic heads. At present, the yield of magnetic heads is generally low.

In view of the above problems, an object of the present invention is to provide a magnetic head assembly capable of reducing the influence of external noise as much as possible and improving the yield of the magnetic head.

It is an object of the present invention to provide a method of manufacturing a magnetic head assembly that can easily assemble a magnetic head assembly and improve the yield of a magnetic head.

[Means for solving the problem]

In order to solve the above-mentioned problems, a magnetic head assembly according to the first aspect of the present invention has a head IC as shown in FIG.
14 is fixedly attached to the spring arm 13 in a state where laser trimming is possible.

A manufacturing method according to claim 2, wherein a slider 11 having a magnetic head 10 and a gimbal supporting the slider 11 are provided.
12 and the spring arm 13 and the magnetic head
A step of assembling a gimbal assembly 9 comprising a head IC 14 for supplying a write signal to the magnetic head 10 and amplifying a read signal from the magnetic head 10; In addition, the method includes a step of adjusting the gain and frequency characteristics of the head IC 14 by laser trimming, and a step of attaching the adjusted gimbal assembly 9 to the arm 16.

(Operation)

The circuit constant of the head IC 14 is adjusted by laser trimming, whereby the gain and frequency characteristics of the head IC 14 are corrected according to the reproduction characteristics of the magnetic head 10.

In manufacturing the magnetic head assembly 1, the gimbal assembly 9 is assembled. The gain and frequency characteristics of the head IC 14 are adjusted by laser trimming while accessing the magnetic recording medium 33 for adjustment by the gimbal assembly 9. Gimbal assembly 9
Are attached to a suitable arm 16.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a magnetic head assembly 1 according to the present invention.

The magnetic head assembly 1 includes a slider 11 having a magnetic head 10, a gimbal 12 supporting the slider 11,
Spring arm 13, head IC1 connected integrally with 12
4. It is composed of an FPC 15 for wiring, an access arm 16 for supporting and moving the whole, and the like.

The slider 11 is made of a material such as ceramics or ferrite, and is formed in a state where the magnetic head 10 is embedded by a thin film or a winding.
The magnetic disk floats in response to the airflow on the surface of the magnetic disk, and the magnetic head 1 performs reading and writing on the magnetic disk.

The gimbal 12 and the spring arm 13 are made of a metal plate or the like, and support the slider 11 in a tiltable manner. The spring arm 13 has a head IC 1 on the FPC 15 along its lower surface.
A hole 21 for mounting 4 is provided, and a mounting plate 22 having a screw hole 23 is integrally provided for mounting to the access arm 16 with a screw.

The head IC 14 is an integrated circuit for supplying a write signal to the magnetic head 10 and amplifying a read signal from the magnetic head 10, and is connected by wire bonding to the FPC 15 in a bare chip state so that laser trimming is possible. It is mounted.

The FPC 15 is provided along the lower surface of the spring arm 13, and a leading end of the FPC 15 is connected to a lead wire of the magnetic head 10. After attaching the spring arm 13 to the access arm 16, the spring arm 13 is connected to another FPC (not shown) provided on the access arm 16 by soldering or the like.

The gimbal assembly 9 is an integral body including the magnetic head 10, slider 11, gimbal 12, spring arm 13, head IC 14, and FPC 15.

The access arm 16 is driven in the radial direction of the magnetic disk by an access mechanism (not shown).

FIG. 3 is a simplified circuit diagram showing the amplifier circuit of the head IC 14, and FIG. 4 is a diagram showing an example of the frequency characteristics of the amplifier circuit of the head IC 14.

The amplifier circuit of the head IC 14 amplifies the input signal from the magnetic head 10, but its frequency characteristic is raised in a high frequency range in order to compensate for that of the magnetic head 10 and equalize it flat.

As can be understood from FIGS. 3 and 4, the value of the resistor R3 may be increased to increase the gain of the amplifier circuit as a whole, and the resistors R1 and R3 may be increased to increase only the high frequency range. Should be increased together. Such adjustment of the circuit constant is performed by laser trimming.

Next, a method for manufacturing the magnetic head assembly 1 will be described.

First, the slider 11 is assembled to the integrated body of the gimbal 12 and the spring arm 13 so as to be supported by the gimbal 12, and the FPC 15 to which the head IC 14 is attached is attached to the spring arm 13 to assemble the gimbal assembly 9.

Next, the electrical characteristics of the gimbal assembly 9 are adjusted by laser trimming.

FIG. 2 is a perspective view showing the adjusting device 30 of the gimbal assembly 9.

In the adjusting device 30, the gimbal assembly 9 is mounted on the mounting jig 31 by screwing, and the data recorded on the magnetic disk 33 rotated by the spindle motor 32 is read out by the magnetic head 10.

On the magnetic disk 33, a signal optimal for evaluating the characteristics of the magnetic head 10, such as a sweep signal having a constant amplitude in the used band and a signal having the highest frequency having the minimum amplitude in the used band, are written in advance. deep.

The output of the magnetic head 10 is amplified by the head IC 14 and taken out as the output of the gimbal assembly 9. The output of the gimbal assembly 9 is input to a signal detector 34 for testing, where the laser 36 is controlled via a laser controller 35 so that the amplitude becomes the same as the set value, and the head IC
14 internal resistors R1 and R3 are trimmed.

The signal detector 34, the laser controller 35, the laser 36, and the like are known.

As a result, the gain and frequency characteristics of the head IC 14 are corrected in accordance with the reproduction characteristics of the magnetic head 10, and the output of the gimbal assembly 9 becomes uniform regardless of the characteristics of the magnetic head 10.

When the laser trimming is completed, coating for protecting the head IC 14 is performed.

Thereafter, the gimbal assembly 9 is assembled to an appropriate access arm 16 to complete a magnetic disk drive.

According to the above-described embodiment, since the head IC 14 is attached to the spring arm 13, the magnetic head 10 and the head
The FPC 15 (transmission line) between the IC and the IC 14 is shortened, and the noise resistance against external noise and the like is increased. Further, the size of the access arm 16 can be reduced.

The head IC 14 is mounted so as to be capable of laser trimming, and when the gimbal assembly 9 is assembled, the gain and frequency characteristics are adjusted by laser trimming, so that variations in the characteristics of the magnetic head 10 are corrected. As a result, the gimbal assembly 9 can be assembled to the access arm 16 very easily, and the yield of the magnetic head 10 is improved.

This makes it possible to manufacture a small, high-performance magnetic disk drive.

In the above-described embodiment, the data written in advance on the magnetic disk 33 is read by the magnetic head 10, but the test data or signal is written on the magnetic disk 33 by the magnetic head 10 and read by the magnetic head 10. The adjustment may be made as described above. The structure, shape, material, circuit, etc. of each part of the magnetic head assembly 1 or the gimbal assembly 9 can be various other than those described above.

In the above embodiment, the Watrous type magnetic head assembly 1 has been described.
It can be applied to various other types of magnetic head assemblies.

〔The invention's effect〕

According to the first aspect of the present invention, the influence of external noise can be reduced as much as possible, and the yield of the magnetic head can be improved.

According to the second aspect of the present invention, the magnetic head assembly can be easily assembled, and the yield of the magnetic head can be improved.

Thus, the performance of the magnetic disk device and the like can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a magnetic head assembly according to the present invention, FIG. 2 is a perspective view showing a gimbal assembly adjusting device, FIG. 3 is a simplified circuit diagram of an amplifier circuit of a head IC, and FIG. FIG. 3 is a diagram illustrating an example of frequency characteristics of an amplifier circuit of a head IC. In the figure, 1 is a magnetic head assembly, 9 is a gimbal assembly, 10 is a magnetic head, 11 is a slider, 12 is a gimbal, 13 is a spring arm, 14 is a head IC, 16 is an access arm (arm), and 33 is a magnetic disk ( Recording medium).

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kiichiro Kasai 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Fujitsu Limited

Claims (2)

(57) [Claims] A slider (11) having a magnetic head (10)
A gimbal (12) and a spring arm (13) for supporting the slider (11); and a write signal for supplying a write signal to the magnetic head (10) and amplifying a read signal from the magnetic head (10). A magnetic head assembly (1) having a head IC (14), wherein the head IC (14) is fixedly attached to the spring arm (13) in a state where laser trimming is possible. A magnetic head assembly, comprising: 2. A slider (11) having a magnetic head (10).
A gimbal (12) supporting the slider (11) and a spring arm (13); a write signal supplied to the magnetic head (10);
Head IC (1) for amplifying the read signal from
4) assembling a gimbal assembly (9) comprising: and the head IC (14) while accessing the magnetic recording medium (33) for adjustment by the gimbal assembly (9).
A step of adjusting the gain and frequency characteristics of the arm by laser trimming, and a step of attaching the adjusted gimbal assembly (9) to the arm (16).