JP2001312871A - Head supporting mechanism, assembly and information recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the vibration of a head supporting mechanism. SOLUTION: A joined part between a load beam 6 and a flexure 5 is pre- positioned directly to the flexure 5 which is bulged out of the load beam 6, at least, in the side of flexure 5 bulging out of the longitudinal center line 8 of the load beam 6. Thus, the vibration of the flexure 5 is supported.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording device such as a magnetic disk device used for an external recording device of a computer or a home electric appliance, and a head assembly and a head supporting mechanism which are components thereof.

[0002]

2. Description of the Related Art As described in Japanese Patent Application Laid-Open No. 9-128728, a flexure in which a connection conductor for electrically connecting to a head slider is formed as a thin film pattern extends from the head slider to the vicinity of a load beam. Something was done.

In such a conventional example, the joint between the load beam and the flexure near the load bending portion of the load beam is disposed on the longitudinal center line of the load beam.

[0004] Then, as shown in FIG. 7, the thin film wiring pattern 7 is drawn out to the side from between the flexure 5 and the rear end welding point 10 of the load beam 6 and the load bending portion 8 of the load beam 6. The load beam 6 was drawn laterally at a right angle from the root of the load bending portion 8.

[0005]

In the prior art, since the flexure extends over the side of the load beam, the vibration of the flexure excites the entire head support mechanism, and the head positioning accuracy of the information recording / reproducing apparatus is deteriorated. .

Further, if the load beam is formed to have an asymmetric flexure shape at the center line in the longitudinal direction, or asymmetrically provided at the center line with a joint, particularly at a welding point, mass imbalance with respect to the center line and distortion of the load beam due to welding will occur. There is also a problem that vibrations due to such factors are excited, and the head positioning accuracy of the information recording / reproducing apparatus is deteriorated.

Further, the width W1 of the thin film wiring pattern portion drawn to the side of the flexure is wider than the width W0 of the flexure flexible portion 11. Therefore, as shown in FIG.
When a plurality of flexures 5 are arranged within the flexure 3, the pitch interval P of the flexures 5 cannot be reduced because the drawer 12 interferes with the adjacent flexures 5, and the number of flexures taken per flexure sheet decreases. There was a problem of doing. As a result, the cost per flexure has been high.

An object of the present invention is to provide an information recording / reproducing apparatus with improved head positioning accuracy.

Another object of the present invention is to reduce the cost of a flexure in an information recording / reproducing apparatus.

[0010]

The object of the present invention is to provide a load beam and a flexure joint at a position immediately before the flexure projects from the load beam, at least on the side where the flexure projects from the longitudinal center line of the load beam. The problem can be solved by suppressing the flexure vibration.

Alternatively, the problem can be solved by forming a flexure shape symmetrical with respect to the longitudinal center line of the load beam, providing a joint portion symmetrical with the center line axis, and reducing the mass balance and the distortion of the load beam.

Alternatively, the thin film wiring pattern is drawn obliquely to the side of the mount so that the flexure width at an arbitrary position is equal to or less than the maximum width of the flexure flexible portion.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a magnetic disk device as an information recording device to which the present invention is applied. FIG. 2 is a plan view of a head assembly used in the magnetic disk drive of FIG.

A head slider 2 for recording / reproducing information recorded on a magnetic disk 16 as a recording medium is provided at the tip of the head support mechanism 1. A small gap is formed on the magnetic disk 16 as a rotating recording medium. Keep up and float. The root of the head support mechanism 1 is joined to a carriage arm 3 of an actuator for moving the head slider 2.

The head support mechanism 1 includes a mount 4 for joining the head support mechanism 1 to the carriage arm 3 and a head slider 2, and a mount 4 for joining the head support mechanism 1 to the carriage arm 3 and a terminal portion of the head slider 2. A flexure 5 integrated with a thin film wiring pattern for electrically connecting signals to a flexure 5 (not shown), a load beam 6 for joining the mount 4 and the flexure 5 and applying a load to the head slider 2 are provided. .

At one end, the head support mechanism 1 grips the head slider 2, and at the other end, the flexure 5 has a load beam at a slightly distal end side (head slider 2 side) of a spring portion (load bending portion) 7 of the load beam 6. 6 and extends to the side of the mount 4. And flexure 5
Denotes an FPC (Flexible Print Circuit) connected to the recording / reproducing circuit of the magnetic disk device on the side of the mount 4.
Is joined to.

The flexure 5 includes the head slider 2
The load beam 6 is joined to the load beam 6 at four welding points 10 by spot welding using a laser or the like on the tip side of the spring portion 7 of the load beam 6 that applies a load to the load beam 6. One of the welding points 10a is located between the load beam longitudinal center line 8 and the load beam side end 9 in the vicinity of the flexure 5 projecting from the load beam 6. Others are a welding point 10b arranged on the longitudinal center line 8 of the load beam and a welding point 10c arranged near the longitudinal center line 8 of the load beam.

FIG. 3 shows the vibration characteristics when there is a welding point 10a.
FIG. 4 shows the vibration characteristics when only the vicinity of the load beam longitudinal center line 8 is joined without the welding point 10a. Welding point 1
It can be seen that by adding 0a, the gain of the vibration peak below 6 kHz is reduced by about 10 dB, and the vibration is reduced.

As in the present embodiment, a joint is provided between the load beam longitudinal center line 8 and the load beam side end 9 in the vicinity of the flexure 5 projecting from the load beam 6, so that the head support mechanism 1 is low. Because of the vibration, the magnetic disk device using the head support mechanism 1 can perform head positioning with high accuracy. Therefore, the track density can be increased and a large-capacity magnetic disk device can be realized.

In the head support mechanism 1, the flexure 5 is joined to the load beam 6 at a tip end welding point 9 and a rear end welding point 10 at a tip end portion of the spring portion 7 thereof. Then, from the middle between the front end welding point 9 and the rear end welding point 10, W0 ≧ W1: the width W0 of the flexure flexible portion 11: the width W1 at an arbitrary position of the flexure 5 at a predetermined angle laterally so as to satisfy: Thus, the drawer 12 is drawn out. When the flexure 5 is arranged on the flexure sheet 13, the minimum width a that can be etched can be made equal to the gap between the flexure flexible portions 11 on the front end side as shown in FIG. P can be filled.

Therefore, by arranging more flexures 5 on one flexure sheet 13, the unit price of the flexure can be reduced, and as a result, the cost of the head support mechanism can be reduced.

Further, the positioning holes 14 are arranged between the drawer 12 and the welding points 10a and 10b, so that the positioning pins (not shown) can be used when assembling the head support mechanism 1.
The flexure 5 can be prevented from being scratched or turned up when it is inserted or removed.

FIG. 6 is a plan view of a head supporting mechanism according to a second embodiment of the present invention. It is incorporated in a magnetic disk device similar to that of the first embodiment. The flexure 5 of the head support mechanism 1 has a substantially symmetrical shape with respect to the longitudinal center line 8 of the load beam except for a portion protruding from the load beam 6. The welding points 10 are also arranged axially symmetrically with respect to the longitudinal center line 8 of the load beam.

Since the shape of the flexure 5 and the position of the ten welding points are substantially symmetrical with respect to the center line 8 of the load beam, the weight is balanced with respect to the center line 8 of the load beam, and the distortion of the load beam 6 due to the welding point 10 is also reduced. Since the load beam 6 is substantially uniform with respect to the longitudinal center line 8, the torsional vibration of the load beam 6 hardly occurs. Also in this embodiment, since the head support mechanism 1 has low vibration, a large-capacity magnetic disk device can be realized as in the first embodiment.

It is also possible to adopt a structure in which an integrated circuit for recording / reproducing signals is mounted on the flexure 5 to improve transmission characteristics.

Although these embodiments have been described with reference to a magnetic disk drive, a large-capacity information storage apparatus can be realized by applying the present invention to an information storage apparatus using a rotating medium other than a magnetic disk drive. There is an effect of doing.

[0027]

Since the head support mechanism 1 has low vibration, the head positioning accuracy is good and the track density can be increased. By increasing the track density, a large-capacity information recording device can be realized.

[Brief description of the drawings]

FIG. 1 is a perspective view of a magnetic disk drive.

FIG. 2 is a plan view of a head support mechanism of the first embodiment.

FIG. 3 is a diagram showing vibration characteristics when a welding point 10a is present.

FIG. 4 is a diagram showing vibration characteristics when there is no welding point 10a.

FIG. 5 is a sheet layout diagram of the flexure of the present invention.

FIG. 6 is a plan view of a head support mechanism according to a second embodiment.

FIG. 7 is a sheet layout diagram using a conventional flexure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Head support mechanism, 2 ... Head slider, 3 ... Carriage arm, 4 ... Mount, 5 ... Flexure, 6 ... Load beam, 7 ... Spring part, 8 ... Load beam center line, 9 ...
Load beam side end, 10: welding point, 11: flexure flexible part, 12: drawer part, 14: positioning hole, 16 ...
Magnetic disk.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshihiko Shimizu 502 Kandate-cho, Tsuchiura-shi, Ibaraki Pref. Machinery Research Laboratories, Hitachi Ltd. Within the Machinery Research Laboratory (72) Inventor Haruhide Takahashi 2880 Kozu, Odawara City, Kanagawa Prefecture Storage Systems Division, Hitachi, Ltd. (72) Kosaku Wakatsuki 2880 Kozu, Kozuhara, Odawara City, Kanagawa Prefecture Storage System Business, Hitachi, Ltd. Within (72) Inventor Naoki Maeda 2880 Kofu, Odawara City, Kanagawa Prefecture Within Hitachi Storage Systems Division, Ltd. (72) Inventor Kenji Takahashi 2880 Kozu, Kodawara, Kanagawa Prefecture, Hitachi Storage Systems Division, F-term ( Reference) 5 D042 NA02 PA10 TA07 TA09 5D059 AA01 BA01 CA21 DA03 DA36 EA07

Claims (7)

[Claims] A load beam interposed between a head slider for recording information on a recording medium and / or reproducing information from the recording medium and an actuator for moving the head slider, and for applying a load to the head slider; A portion is provided along the longitudinal center line of the load beam to grip the head slider, and has a portion projecting in one horizontal direction of the load beam on the head slider side from a load bending portion of the load beam. A head support mechanism comprising: a flexure at a joint portion with a load beam, which is located farther from the center line than a joint point of another portion. 2. A head slider for recording information on a recording medium and / or reproducing information from the recording medium, a load beam for applying a load to the head slider, and a head slider disposed along a longitudinal center line of the load beam. And has a portion extending in one lateral direction of the load beam on the head slider side from the load bending portion of the load beam, and the joining portion of the projecting portion with the load beam is closer than the joining point of the other portion. A head assembly comprising: a flexure at a position distant from the center line; and a mount for joining the load beam to a carriage arm of an actuator for moving the head slider. 3. The head assembly according to claim 2, wherein a joint between the load beam and the flexure is joined by welding. 4. A longitudinal center of the load beam relative to a position immediately before the flexure overhangs from the load beam, at least to the joint portion provided on a side where the flexure overhangs from a longitudinal center line of the load beam. 4. The head assembly according to claim 2, wherein another joint portion is provided at an axially symmetric position where the line is a symmetric axis. 5. A head slider for recording information on a recording medium and / or reproducing information from the recording medium, a load beam for applying a load to the head slider, and a flexible portion having a width at an arbitrary position to grip the head slider. And a mount for joining the load beam and a carriage arm of an actuator for moving the head slider. 6. The head assembly according to claim 2, wherein an integrated circuit for recording / reproducing signals is mounted on said flexure. 7. A recording medium, a head slider for recording information on and / or reproducing information from the recording medium, a load beam for applying a load to the head slider, and a longitudinal center line along the load beam. The head slider is disposed and has a portion that extends in one horizontal direction of the load beam on the head slider side from the load bending portion of the load beam, and a joint portion of the extension with the load beam is another portion. An information recording apparatus, comprising: a flexure located at a position further away from the center line than a joining point of the portions; and a mount for joining the load beam and a carriage arm of an actuator for moving the head slider.