CN1873780A - Head gimbal assembly with additional plate and manufacturing method thereof - Google Patents

Abstract

The present invention provides a head gimbal assembly, which includes a magnetic head, a suspension member having a magnetic head holding plate, and an additional plate mounted on the suspension member. The additional plate has a small protrusion for partially supporting the magnetic head holding plate. The present invention provides a method for manufacturing a head gimbal assembly, which includes the following steps: (1) forming a suspension member having a magnetic head holding plate, an additional plate having a small protrusion, and a magnetic head; (2) mounting the magnetic head on the suspension member; and (3) connecting the additional plate to the suspension member. The head gimbal assembly has a simple structure, is quick and convenient to assemble, and has good performance.

Description

Head gimbal assembly with additional plate and manufacturing method thereof

technical field

The present invention relates to a head gimbal assembly (head gimbal assemblies, HGAs) and a disk drive unit, in particular to a head gimbal assembly with an additional plate and a manufacturing method thereof.

Background technique

A disk drive is an information storage device that uses magnetic media to store data. A typical existing disk drive unit includes a disk and a head suspension assembly (HSA). Wherein, the magnetic disk is mounted on a spindle motor for driving the magnetic disk to rotate. The magnetic head on the magnetic head suspension assembly flies over the surface of the disk, and then reads or writes data from the disk.

The existing magnetic head suspension assembly includes a rigid drive arm, at least one flexible suspension member fixed at one end of the drive arm, and a magnetic head mounted on the top of each suspension member (the suspension member with the magnetic head is called “head gimbal assembly” ( HGA)). The head suspension assembly is constructed such that when a force is applied to the head towards the disk, a leaf spring structure is formed on the suspension itself or its connection to the drive arm.

1-2, the existing cantilever member 14 includes a separate load rod 33 and a separate flexible member 32, the load rod 33 and the flexible member 32 are partially overlapped together and conventionally (such as laser welding or bonding) ) are interconnected. The suspension member 14 further includes a pivot member (not marked) connected to the driving arm 34 . A lifting piece 331 is extended from one end of the load rod 33 to cooperate with a ramp (not shown) on the disk drive casing. The load bar 33 is formed with a small protrusion 329 to support the flexible member 32 at the center of the magnetic head installation area, and the small protrusion 329 on the load bar 33 can keep the load pressure always applied to the central area of the magnetic head 203, Therefore, the static and dynamic postures of the magnetic head 203 are maintained, thereby ensuring that the magnetic head 203 successfully reads data from or writes data on the magnetic disk.

However, the assembling process of the head gimbal assembly (HGA) with the above-mentioned conventional structure is quite complicated because: first, referring to FIG. 32 will form a gap. When the magnetic head 203 is installed on the flexure 32, because the load bar 33 is supported by the workbench and a gap is formed between the flexure 32 and the workbench, the magnetic head 203 is placed on the flexure 32, and the magnetic head 203 is placed on the flexure 32. Attaching to the flexure 32 and making an electrical connection (GBB or SBB) between the two is inconvenient. In addition, it takes a lot of time and money to form the separate load bar 33 and flexure 32 . Moreover, because the conventional HGA assembly in FIG. 1 must overlap a certain area of the load bar 33 and the flexure 32 to assemble them together, correspondingly, the overlapping portion of the flexure 32 and the load bar 33 will increase. The overall height and weight of the HGA (HGA, disk drive). In addition, the conventional HGA has a huge inertia, which leads to poor anti-vibration performance during operation. When an external impact is applied to the HGA, the magnetic head may vibrate strongly under the impact and collide with the surface of the magnetic disk, thereby damaging the surface of the magnetic disk and/or the magnetic head.

Therefore, it is necessary to provide a HGA with an additional plate and a manufacturing method thereof to overcome the above disadvantages.

Contents of the invention

The purpose of the present invention is to provide a head gimbal assembly with an additional plate with a simpler and more reliable manufacturing process.

Another object of the present invention is to provide a HGA and a disk drive unit comprising the above-mentioned HGA with additional plates.

Another object of the present invention is to provide a method for manufacturing a head gimbal assembly with an additional plate

To achieve the above object, a magnetic head gimbal assembly of the present invention includes: a magnetic head; a suspension with a magnetic head holding plate; and an additional plate installed on the suspension; raised. In the present invention, the additional plate has lifting tabs. In one embodiment, the additional plate is fixed to the cantilever by means of laser welding. The additional board further includes a connecting portion connected to the cantilever member, and a board body connected to the lifting sheet, wherein the small protrusion is formed on the board body. The connecting portion is triangular. The cantilever is a one-piece structure.

The invention provides a magnetic head suspension assembly, comprising: at least one magnetic head gimbal assembly; and a driving arm connected with the at least one magnetic head gimbal assembly. Each head gimbal assembly includes: a magnetic head; a suspension with a head holding plate; an additional plate mounted on the suspension; the additional plate has a small protrusion for partially supporting the head holding plate. In the present invention, the additional plate has lifting tabs.

A disk drive unit of the present invention comprises: a head suspension assembly; a drive arm connected to the head suspension assembly; a disk; a spindle motor driving the disk to rotate; and a disk drive casing with a ramp. The head suspension assembly includes: at least one head gimbal assembly; a drive arm connected to the at least one head gimbal assembly; wherein each head gimbal assembly includes: a magnetic head; a suspension member with a head holding plate; mounted on the suspension arm An additional plate on the piece; the additional plate has small protrusions to partially support the head holding plate. In the present invention, the additional plate has a lifting tab.

A method for manufacturing a magnetic head gimbal assembly of the present invention comprises the following steps:

(1) forming a suspension with a magnetic head holding plate, an additional plate with small protrusions, and a magnetic head;

(2) Install the magnetic head on the cantilever;

(3) Attach the additional plate to the cantilever.

In the present invention, forming the additional plate further includes the step of forming a lifting piece on the additional plate.

Compared with the prior art, first of all, because the HGA (HSA, disk drive) of the present invention includes an additional plate provided with small protrusions, the additional plate is connected to the suspension after the magnetic head is mounted on the suspension on file. Since the influence of small protrusions on the additional plate is eliminated, the magnetic head can be reliably and easily mounted on the suspension. Furthermore, because the cantilever has a one-piece structure, it is easy to manufacture with little overlap that exists in prior art cantilevers. Correspondingly, this will reduce the inertia of the entire head arm assembly (head suspension assembly, disk drive), thereby improving its shock resistance. In addition, since the additional board is attached to the suspension after the head is mounted on the suspension, it is easy to align the small protrusions with the center of the head. In this way, the load pressure is always exerted on the central area of the magnetic head through the small protrusion, thereby maintaining the static and dynamic posture of the magnetic head, thereby ensuring that the magnetic head successfully reads data from or writes data on the magnetic disk.

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

FIG. 1 is a perspective view of a conventional head arm assembly (HAA).

FIG. 2 is a schematic diagram of the magnetic head area of the magnetic head arm assembly in FIG. 1 .

FIG. 3 is a perspective view of the first embodiment of the magnetic head arm assembly of the present invention.

FIG. 4 is a three-dimensional assembly view of FIG. 3 .

FIG. 5 is a partially enlarged view of the magnetic head arm assembly in FIG. 4 for showing the reinforcing ribs thereon.

6A-6B illustrate the process of installing the magnetic head on the suspension member of the magnetic head arm assembly in FIG. 4 .

FIG. 7 is a schematic diagram of the magnetic head area of the magnetic head arm assembly in FIG. 4 .

Fig. 8 is a perspective view of an embodiment of the magnetic head drive unit with an additional board of the present invention.

Detailed ways

As shown above, the present invention provides a head gimbal assembly (HGA) with an additional plate, and a manufacturing method of the HGA to simplify the assembly of the HGA. The head gimbal assembly includes a magnetic head, a suspension with a head holding plate and an additional plate mounted on the suspension, the additional plate has a small protrusion partially supporting the head holding plate.

In the present invention, the additional board is connected to the suspension after the magnetic head is installed on the suspension, so the small protrusion on it does not affect the installation of the magnetic head, such as placing the magnetic head on the suspension, connecting the magnetic head to the suspension components and make electrical connections between them. In one embodiment, the additional plate has lifting tabs cooperating with ramps. Such a HGA with additional plates and a HSA with such an HSA will be described in detail below.

3-4, according to an embodiment of the present invention, the head arm assembly 13 (the head suspension assembly with only one head gimbal assembly) includes a magnetic head 203, a suspension member 14 carrying the magnetic head 203, and a suspension member 14 connected to the magnetic head 203. The additional plate 15 and the driving arm 34 on the suspension (the suspension 14 and the magnetic head 203 form the HGA 18). The suspension 14 includes a connecting portion 131 connected to the driving arm 34 , a head holding plate 328 carrying the magnetic head 203 , and a base portion 399 connecting the connecting portion 131 and the head holding plate 328 . In the present invention, the suspension member 14 is an integral structure on which a plurality of traces 309 are formed.

In the present invention, the cantilever 14 having a one-piece structure avoids overlapping certain parts thereof when the flexible member and the load bar are assembled into a cantilever, and correspondingly, the overlapped portion of the flexible member and the load bar Will no longer exist, thereby reducing the height and weight of the entire head arm assembly (head suspension assembly, disk drive). At the same time, reducing the weight of the entire head arm assembly (head suspension assembly, disk drive) will reduce its inertia, thereby improving its shock resistance.

In one embodiment of the present invention, referring to FIGS. 3-4, the suspension member is a connecting member, and the conductive circuit 309 is integrally combined with it, thereby providing a connection between the printed circuit board (PCBA, not shown) and the magnetic head 203. electrical connection. In the present invention, the suspension member can be made of a laminate, for example, the laminate can be a trace suspension assembly (TSA), a circuit integrated suspension (CIS) and a flexible Cantilever combination (flex suspension assembly, FSA). After the cantilever member 14 is fabricated, it will be joined to the drive arm 34 by welding or other conventional means.

In the present invention, a reinforcing rib is longitudinally formed on the suspension member 14 to increase its rigidity, so that the suspension member 14 has sufficient rigidity to maintain the magnetic head 203 at a predetermined position relative to the disk surface. In this way, the rigidity of the suspension member 14 will be greatly increased, so that a load/unload operation (load-unload operation) can be successfully completed. In one embodiment of the present invention, referring to FIG. 5 , the reinforcing rib is at least one rail, for example, two rails 132 , and the rails 132 are formed by bending the sides of the base 399 .

Please refer to FIG. 4 , one end of the magnetic head 203 has a plurality of electrical contacts 204 . The magnetic head holding plate 328 also has an electrical contact 141 corresponding to the electrical contact 204 of the magnetic head 203 at a predetermined position. A plurality of metal balls 400 (GBB or SBB, please refer to FIG. 6 ) are electrically connected to the electrical contact 204 of the magnetic head 203 and the electrical contact 141 of the magnetic head holding plate 328, thereby establishing an electrical connection between the magnetic head 203 and the magnetic head holding plate 328. sexual connection.

3-4, the additional board 15 includes a connecting portion 151 connecting the suspension member 14, on which a small protrusion 153 is provided to support the board body 152 of the magnetic head holding board 328 and the slope 121 of the disk drive (please refer to FIG. 8) Cooperating lifting piece 154. In the present invention, this additional plate 15 can be made of stainless steel or other rigid material. In one embodiment, the connecting portion 151 is triangular to enlarge the contact area with the cantilever member 14 . The small protrusion 153 is located on the plate body 152 at a position corresponding to the position where the magnetic head 203 is installed on the magnetic head holding plate 328 . In the present invention, the additional plate 15 can be connected to the suspension member 14 by laser welding, bonding or other bonding methods.

In the present invention, a manufacturing method of the HGA 18 includes the following steps:

(1) forming the suspension member 14 with the magnetic head holding plate 328, the additional plate 15 and the magnetic head 203 with the small protrusion 153;

(2) The magnetic head 203 is installed on the suspension member 14;

(3) Attach the additional plate 15 to the suspension member 14 .

In one embodiment of the present invention, forming the additional plate further includes the step of forming a lifting piece on the additional plate. The cantilever 14 is made of seamless sheet material. Referring to FIGS. 6A-6B , in the process of installing the magnetic head 203 on the suspension 14 , first put adhesive or epoxy glue on the magnetic head holding plate 328 , and then place the magnetic head 203 on the suspension 14 . Because the cantilever 14 itself has a flat structure, it can be supported by the workbench 500, so that the magnetic head 203 can be easily installed on the predetermined position of the magnetic head holding plate 328, and the external pressure F can be applied to the magnetic head 203 to glue the magnetic head 203. The adhesive or epoxy glue is tightly bonded to the magnetic head holding plate 328. Likewise, the electrical connection between the magnetic head 203 and the suspension 14 can be operated smoothly due to the flat structure of the suspension 14 .

Referring to FIG. 7 , after the magnetic head 203 is mounted on the suspension 14 , the additional board 15 is connected to the suspension 14 . In the present invention, the additional plate 15 includes a small protrusion 153 which serves as a reference for assembling the lifting piece 15 and the cantilever member 14 . The small protrusion 153 is preferably positioned on the center of the magnetic head 203 so that the load force always acts on the central area of the magnetic head 203 through the small protrusion 153 . This will maintain the static and dynamic postures of the magnetic head 203, thereby ensuring that the magnetic head 203 can successfully read or write data from the magnetic disk 101 (please refer to FIG. 8). Here, since the additional board 15 is attached to the suspension 14 after the magnetic head 203 is mounted on the suspension 14, it is easy to align the small protrusion 153 to the center of the magnetic head 203. Although the small protrusion 153 will still support the suspension 14 at a certain angle, since the magnetic head 203 is installed on the suspension 14 first, the connection of the magnetic head 203 is not affected.

In one embodiment of the present invention, the step of forming the additional plate 15 includes:

(1) forming the connecting portion 151, the plate body 152 and the lifting piece 154;

(2) A small protrusion 153 is formed on the plate body 152 to support the magnetic head 203 .

The connecting portion 151 , the plate body 152 and the lifting piece 154 are made of seamless plates.

In the present invention, the head arm assembly 13 is just an example for explaining the working principle of the additional board 15, but the present invention is not limited to this head arm assembly, obviously the present invention can be applied to other head arm assemblies with additional boards. Two or more HGAs 18 can be assembled together to form the HSA of the present invention.

According to an embodiment of the present invention, referring to FIG. 8 , a disk drive unit 200 of the present invention can be obtained by assembling a disk 101 , a spindle motor 102 , a head arm assembly 13 and a disk drive housing 90 . A ramp is provided on the disk drive housing 90 to cooperate with the lifting piece 154 of the HBA 13 . Since the process of assembling the disk drive 200 using the magnetic head arm assembly 13 of the present invention and the structure of the disk drive 200 are well known to those skilled in the art, they will not be described in detail here.

Claims (10)

1, a kind of magnetic head fold piece combination comprises:

Magnetic head;

Cantilever part with magnetic head holding board; And

Be installed in the add-in card on the cantilever part; Described add-in card has the small embossment that supports the magnetic head holding board in order to part.

2, magnetic head fold piece combination as claimed in claim 1 is characterized in that, this add-in card has the lifting sheet.

3, magnetic head fold piece combination as claimed in claim 1 is characterized in that, this add-in card is fixed on the cantilever part by the laser bonding mode.

4, magnetic head fold piece combination as claimed in claim 1 is characterized in that, this add-in card further comprises the coupling part that connects cantilever part, and the plate body that is connected with the lifting sheet, and wherein said small embossment is formed on the plate body.

5, magnetic head fold piece combination as claimed in claim 5 is characterized in that, this coupling part is a triangle.

6, a kind of magnetic head cantilever combination comprises:

At least one magnetic head fold piece combination;

Actuating arm with this at least one magnetic head fold piece combination is connected is characterized in that:

Described each magnetic head fold piece combination comprises:

Magnetic head;

Cantilever part with magnetic head holding board;

Be installed in the add-in card on the cantilever part; Described add-in card has the small embossment that supports the magnetic head holding board in order to part.

7, magnetic head cantilever combination as claimed in claim 6 is characterized in that this add-in card has the lifting sheet.

8, a kind of disc drive unit comprises:

The magnetic head cantilever combination;

The actuating arm that is connected with this magnetic head cantilever;

Disk;

Drive the Spindle Motor of this disk rotation;

Have the disc driver casing on slope (ramp), it is characterized in that:

This magnetic head cantilever combination comprises:

At least one magnetic head fold piece combination;

The actuating arm that is connected with this at least one magnetic head fold piece combination; Wherein

Described each magnetic head fold piece combination comprises:

Magnetic head;

Cantilever part with magnetic head holding board;

Be installed in the add-in card on the cantilever part; Described add-in card has the small embossment that supports the magnetic head holding board in order to part.。

9, a kind of method of making magnetic head fold piece combination may further comprise the steps:

(1) formation has the cantilever part of magnetic head holding board, the add-in card with small embossment and magnetic head;

(2) magnetic head is installed on the cantilever part;

(3) add-in card is connected on the cantilever part.

10, the method for manufacturing magnetic head fold piece combination as claimed in claim 9 is characterized in that: form add-in card and further be included in the step that forms the lifting sheet on the add-in card.

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