CN101089955B

CN101089955B - Suspension of magnetic disc driver

Info

Publication number: CN101089955B
Application number: CN2006101667272A
Authority: CN
Inventors: 高木康司; 半谷正夫; 入内嶌修; 藤原哲哉; 大本亮藏
Original assignee: NHK Spring Co Ltd
Current assignee: NHK Spring Co Ltd
Priority date: 2002-03-29
Filing date: 2002-03-29
Publication date: 2010-05-19
Anticipated expiration: 2022-03-29
Also published as: CN101089955A

Abstract

A suspension frame of magnetic disc driver consists of a base, a bear with flexible unit, hinge element for connecting said base with said beam, hole set on beam and cover for covering said hole. It is featured as forming said cover by extended part of extending partial hinge element towards to beam.

Description

The suspension of disc driver

The application be that March 29, application number in 2002 are 02107699.5 the applying date, name is called the dividing an application of application for a patent for invention of " suspension of disc driver ".

Technical field

The present invention relates to a kind of suspension that is installed in signal conditioning package, uses such as the disc driver in the PC.

Background technology

Be used for that the hard disk drive (HDD) of typing and sense information comprises a support on disk that rotates or magneto-optic disk, it can be around a rotation.Support rotates around axle by a positioning motor.Support is provided with an arm (actuator arm), and one is installed in the suspension of arm end portion, comprises head that is installed in the sliding part on the suspension or the like.When the disk high-speed rotation, sliding part rises on magnetic disk surface slightly, forms air cushion thus between disk and sliding part.This suspension comprises the bottom with base plate, and the beam part that is formed by high-precision laminated spring is fixed on flexed portion on the beam part by modes such as laser bonding.Base plate is fixed on the suspension installation surface of arm.

Development along with the speed-raising of the compression that is recorded in the information on the disk and disk drive operation requires such disc driver that shorter seek time is arranged.In order to shorten seek time, the rotation of disk must be quickened.

In order to improve the needed performance of suspension, the inventor once proposed a kind of suspension of novelty, wherein, connected bottom and beam part by an articulated elements.According to the prior art, bottom, beam part and articulated elements are parts disconnected from each other, and like this, the material of needed performance and the thickness of plate can be selected respectively separately corresponding to them.

According to a kind of proposal, for example, by making articulated elements than the partly thinner spring constant that reduces articulated elements of beam.Yet like this, the beam part will be more much higher than the rigidity of articulated elements near the rigidity in the zone of articulated elements.If disc driver is vibrated, will make sliding part contact disk heavyly.Like this, vibrationproof has become a critical problem.Therefore,, be proposed in the beam part and form through hole, reduce this regional rigidity thus near in the zone of articulated elements in order to strengthen the vibrationproof performance.

Yet if through hole is formed in the zone of the close articulated elements on the beam part, owing to the influence (windage or air turbulence) of the air on magnetic disk surface to through hole, particularly in the disc driver of disk high-speed rotation, the beam part will be trembleed.

Summary of the invention

Therefore, an object of the present invention is to provide a kind of suspension, it has high vibrationproof and can not tremble, and has less number of spare parts simultaneously.

To achieve these goals, comprise that according to a kind of suspension of first aspect present invention beam part, that a bottom, has a flex member makes bottom and the interconnected articulated elements of beam part, a hole on the beam part and the cover plate part of the opening of a coverage hole, wherein, the cover plate part can be formed to the prolongation that beam partly extends to form by the part of articulated elements.According to the present invention, can provide high vibrationproof to suspension thus, wherein, the beam part is in light weight, and the coverage of vibration can be limited.And according to the present invention, cover plate can utilize the part of articulated elements to constitute, thereby can not increase number of spare parts.

To achieve these goals, thereby according to the cover plate part of a kind of suspension of second aspect present invention making of comprising that beam part, that a bottom, has a flex member makes that bottom and the interconnected articulated elements of beam part, form in the zone of close the articulated elements on the beam part near the opening of the hole of the rigidity reduction in the zone of articulated elements and a coverage hole, wherein, the cover plate part can be formed to the prolongation that beam partly extends to form by the part of articulated elements.According to the present invention, can provide high vibrationproof to suspension thus, wherein, the beam part is in light weight, and the coverage of vibration can be limited.And according to the present invention, cover plate can utilize the part of articulated elements to constitute, thereby can not increase number of spare parts.

Articulated elements is lower than bottom and beam part aspect bendind rigidity.Therefore, when a bending load acted on the beam part, the articulated elements bending showed a given spring performance thus." near the hole of articulated elements formation " described here is such hole, and the position ratio at its place is at the near-end (near the end of articulated elements) of beam part and the more close articulated elements of mid point between the sliding part.Preferably, this hole should form like this, and the position of the center of gravity of beam part and articulated elements assembly is than the more close sliding part in the position at hole place.

In each suspension of first and second kinds of forms, the cover plate part can be formed by the not etching part in the hole on the beam part that forms by local etching.According to the present invention, the cover plate part can utilize the part of beam part to constitute, thereby can not increase number of spare parts.In addition, the cover plate part can easily form by using local etching.

In addition, the cover plate part can be formed by the pieces of sheet that is fixed on the beam part.According to the present invention, cover plate part can be by being fixed on pieces of sheet on the beam part, easily constituting such as belt or paper tinsel.

In addition, the cover plate part can be formed by the part of flex member.According to the present invention, the cover plate part can use the part of the flex member thinner than articulated elements to form.Like this, the quantity of part can not increase.But the influence of the opening limit air disturbance by cover plate part coverage hole.

Other purpose of the present invention and advantage will appear from the following description, and partly will become clear from describe, and maybe can acquire from enforcement of the present invention.Objects and advantages of the present invention can be achieved and obtain by in particular the following means and combination.

Description of drawings

The accompanying drawing that is combined in the instructions and constitutes an instructions part has been described present preferred embodiment of the present invention, and is used for describing principle of the present invention with the detailed description of above-mentioned general description and preferred embodiment given below.

Fig. 1 is the planimetric map according to the suspension of the disc driver of first embodiment of the invention;

Fig. 2 is the cut-open view along the suspension of the F2-F2 line among Fig. 1;

Fig. 3 is the cut-open view of a part with hard disk drive of suspension shown in Figure 1;

Fig. 4 is the chart that is presented at the coverage of the vibration under the situation of using the cover plate part and not using the cover plate part with comparative approach;

Fig. 5 is the planimetric map according to the suspension of second embodiment of the invention;

Fig. 6 is the cut-open view along the F6-F6 line among Fig. 5;

Fig. 7 is the planimetric map according to the suspension of third embodiment of the invention;

Fig. 8 is the cut-open view along the F8-F8 line among Fig. 7;

Fig. 9 is the planimetric map according to the suspension of fourth embodiment of the invention; And

Figure 10 is the cut-open view along the F10-F10 line among Fig. 9.

Embodiment

With reference now to Fig. 1 to 3, the first embodiment of the present invention is described.Hard disk drive shown in Figure 3 (HDD) comprises a support 12, and it can rotate around one 11.Support 12 passes through positioning motor 13, rotates around axle 11 such as a voice coil motor.Arm (actuator arm) 16 is installed on the support 12, is installed in the suspension 17 on each end portion of arm 16 separately, be installed in head 18 on suspension 17 each end portion etc.When support 12 was driven by motor 13, head 18 moved to the magnetic track of required disk 19.

Head 18 comprises that one is positioned at the sensor (not shown) that can be fixed on towards the locational sliding part 20, of the recording surface of disk 19 on the sliding part 20.When disk 19 high-speed rotation, air enters the space between disk 19 and the sliding part 20 and rises slightly and leave disk 19, thereby forms an air cushion between disk 19 and sliding part 20.

As illustrated in fig. 1 and 2, each suspension 17 comprises that a bottom 30, one beam parts 31, connect the flex member 33 of articulated elements 32, on beam part 31 of bottom 30 and beam part 31, or the like.The end portion of beam part 31 is formed with the indenture 34 of projection, and it is in abutting connection with flex member 33.Head 18 is fixed on the flex member 33.Base plate 41 with hub portion 40 is fixed on the bottom 30.As shown in Figure 3, each bottom 30 is fixed on the actuator arm corresponding with it 16.

Bottom 30 and beam part 31 are formed by same material (for example stainless steel).For lighter weight is coordinated mutually with higher rigidity, their available light-alloys, be that the compound substance of base forms such as aluminium alloy or titanium alloy or with these alloys, they can guarantee further improved frequency characteristic and vibration characteristics.

Articulated elements 32 is laminated spring spares, a rolling corrosion resistant plate for example, and it is thinner than bottom 30 and beam part 31.Hole 47 is formed at articulated elements 32 on the core of Width.A part of 32a of articulated elements 32 is fixed on the end of bottom 30 by laser bonding etc.Another part 32 of articulated elements 32 is fixed on the end of beam part 31 by laser bonding etc.In Fig. 1, symbol W represents an example of solder joint.Laser bonding can be replaced by cementing agent or other any suitable fixing means.

The flex member 33 that is fixed on the beam part 31 is formed by laminated spring (for example rolling stainless steel), and it is thinner than beam part 31 and articulated elements 32, and is fixed on the given position of beam part 31 by laser bonding etc.Flex member 33 cooperates formation head 18 with sliding part 20.

Articulated elements 32 in the present embodiment is the parts that are independent of bottom 30 and beam part 31.Therefore, can adopt spring material and the thickness that meets articulated elements 32 desired properties, and irrelevant with bottom 30 and beam part 31.Like this, bottom 30 can easily be coordinated with articulated elements 32 needed performances (for example low spring constant) mutually with beam part 31 needed performances (for example rigidity).For example, beam part 31, bottom 30, articulated elements 32 and flex member 33 can have the thickness of 100 μ m, 200 μ m, 40 μ m and 20 μ m respectively.

The beam of present embodiment partly is formed with the hole 50 near articulated elements 32.These holes 50 are removed a part by local etching from beam part 31 and are formed.They are used for reducing the rigidity of beam part 31 near the zone of articulated elements 32, improve shock resistance thus.

Cover plate part 51 is at least at each opening of a side coverage hole 50 of beam part.Cover plate part 51 in the present embodiment is that the part (for example about 20 μ m thickness) of beam part 31 forms, and it is the not etched part that keeps when forming hole 50 by local etching.Because cover plate part 50 is coverage hole 50 by this way, the influence of air turbulence can be avoided in the zone of beam part 31 close articulated elements 32 when the disk high-speed rotation, and the coverage of vibration can be reduced to uncared-for degree.

In Fig. 4, the analysis result of the flutter effect scope of suspension 17 when line segment A is illustrated in each openings of cover plate part 51 coverage holes 50.The analysis result of the coverage of the vibration of the comparative example when opening that line segment B is illustrated in hole 50 is not partly covered by any cover plate.In Fig. 4, axis of ordinates (moving) is represented the vibration degree, and the lower surface of the sliding part 20 of abscissa axis representative from Fig. 2 is to the size Z (being called the Z height) of the installation surface of base plate 41.As shown in Figure 4, it has shown that the coverage of vibration of the suspension 17 that uses cover plate part 51 is more much lower than the coverage of the vibration of not using cover plate suspension partly.

Fig. 5 and 6 has shown the suspension 17A according to second embodiment of the invention.In suspension 17A, the part of articulated elements 32 is extended to beam part 31, thereby forms prolongation 32c, and it constitutes the cover plate part 51 of each opening of coverage hole 50.The suspension 17A of second embodiment has and identical other basic structure, function and the effect of suspension 17 among first embodiment.Therefore, identical label is used to represent the identical part of two embodiment, and the description of these parts is omitted.

Fig. 7 and 8 has shown the suspension 17B according to third embodiment of the invention.The cover plate part 51 of suspension 17B is formed by the pieces of sheet 60 that occurs with plastic tape or metal in foil form.Pieces of sheet 60 is fixed on the beam part 31 by (for example) cementing agent, thus each opening of coverage hole 50.The suspension 17B of the 3rd embodiment has and identical other basic structure, function and the effect of suspension 17 among first embodiment.Therefore, identical label is used to represent the identical part of two embodiment, and the description of these parts is omitted.

In addition, under the situation according to the suspension 17c among the 4th embodiment shown in Fig. 9 and 10, cover plate part 51 can design like this, and a part of 33a of flex member 33 (here, flex member is the flex member that is connected to circuit) is extended to the position in hole 50.Described cover plate part 51 can only be connected with these embodiment at beam one or both sides, pro and con partly.

Will be appreciated that, when implementing to comprise embodiment described here of the present invention, the part of suspension, the hole that comprises bottom, beam part, flex member, articulated elements, beam part, cover plate part etc. can change or improve in a different manner, and this does not exceed scope and spirit of the present invention.

For those skilled in the art, other advantage and improvement are to find easily.Therefore, shown in the present invention is not limited to here in a broad sense and embodiment described detail and demonstration.Thereby, under the situation of the spirit and scope that do not break away from the total inventive concept that limits by appended claims and their equivalent, also can make many improvement.

Claims

1. the suspension of a disc driver is characterized in that, it comprises:

One bottom (30);

One has the beam part (31) of flex member (33);

Make bottom (30) and beam part (31) interconnected articulated elements (32);

Hole (50) on beam part (31); And

The cover plate part (51) of the opening of coverage hole (50),

Wherein, described articulated elements (32) is the part that is independent of bottom (30) and beam part (31), and this part is a laminated spring spare, it is thinner than bottom (30) and beam part (31), and described cover plate part (51) is that the part by articulated elements (32) forms to the prolongation (32c) that beam part (31) extends to form.

2. the suspension of disc driver as claimed in claim 1 is characterized in that, hole (50) are formed in the zone of close articulated elements (32) of beam part (31), thereby makes the rigidity reduction near the zone of articulated elements (32).