CN101740042B - Main printed board for hard disc driver and hard disc driver thereof - Google Patents
Main printed board for hard disc driver and hard disc driver thereof Download PDFInfo
- Publication number
- CN101740042B CN101740042B CN2009102252504A CN200910225250A CN101740042B CN 101740042 B CN101740042 B CN 101740042B CN 2009102252504 A CN2009102252504 A CN 2009102252504A CN 200910225250 A CN200910225250 A CN 200910225250A CN 101740042 B CN101740042 B CN 101740042B
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- printed board
- fixed part
- extension
- main printed
- interconnection
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- Moving Of Heads (AREA)
- Supporting Of Heads In Record-Carrier Devices (AREA)
- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
- Insulated Metal Substrates For Printed Circuits (AREA)
- Structure Of Printed Boards (AREA)
- Combinations Of Printed Boards (AREA)
Abstract
The present invention relates to a main printed board for hard disc driver and a hard disc driver thereof. In the main printed board for hard disc driver and the hard disc driver thereof, a connection part of a suspension printed board can be provided with an accurate interconnection which is formed with high density, and furthermore the bending resistance and durability in the part to be bended repeatedly can be ensured. The main printed board (15) used for the hard disc driver is fixed to the side part of a carriage (7) of an access arm that is supported in a swinging mode. The main printed board is provided with a top side connected with the suspension printed board (11) and is provided with a base side which extends flexibly. The main printed board comprises a fixed part (15a) which is connected with the side part of the carriage and is furthermore connected with the suspension printed board, and an extending part (15b) which extends from the base side of the fixed part. The fixed part and the extending part are formed respectively through different manufacturing methods. Furthermore the main printed board comprises a connection part (41) for connecting the fixed part and the extending part.
Description
Technical field
The present invention relates to a kind of main printed board that is used for hard disk drive.More specifically, the main printed board that is used for hard disk drive that the present invention relates to be described below, it allows accurately to form the connection interconnection and can guarantee traditional flexibility with high density, and the invention still further relates to this hard disk drive.
Background technology
Usually comprise beared information as the hard disk drive of the memory storage of computing machine and by the motor supporting so that the disk of rotation, and comprise and be used for information is write disk/read from the disk head core of information.Head core is by the magnetic head arm maintenance (for example, seeing the open No.2008-59663 of Jap.P.) that is used for along the surface wobble of disk.
Magnetic head arm comprises the carriage that is supported by voice coil motor (VCM), so that around its axis swing, and the suspension that is arranged in the arm place of this carriage.The magnetic head that is arranged in the top end of this suspension keeps aforementioned head core.
Head core is connected in the suspension printed board (that is, being used for the printed board of suspension) along suspension arrangement and goes up the interconnection that forms, and can read and writing information via this interconnection.The suspension printed board extends through the core of suspension towards the oscillation centre of arm, and is provided with the part that the sidepiece to carriage extends in the central part office of arm.The cardinal extremity of suspension printed board is connected to the top of the main printed board on the sidepiece that is fixed to carriage.
The base portion of main printed board has the part of extending on the contrary with the side that is connected to the suspension printed board; And the part of this extension is connected to the amplification printed board that is arranged in the hard disk drive (that is, be used to amplify printed board) or is used for the connector to external output signal.
The cardinal extremity of main printed board is connected to the carriage that can swing and the amplification printed board or the connector of fixed and arranged, and extends with bridge shape form.Therefore, the cardinal extremity of main printed board is repeatedly crooked according to the swinging operation of carriage.In many cases, will be through removing high repeated flex characteristic of acquisition that method (subtractive) makes or flexible printed board with the printed board of deciding.
In removing method, through from the conductive layer etching on the whole surface that is attached to dielectric substrate or remove unwanted part and form interconnection.Because the Copper Foil of formation interconnection etc. can be attached to dielectric substrate reliably, so flexibility can be high.
In the hard disk drive of above structure, arrange and carry a plurality of disks so that these a plurality of disks are rotated with little interval between them, and with the suspension printed board be arranged between the disk each at interval in.Therefore, be connected to main printed board with the equally isolated a plurality of suspension printed boards of above disk each other.In the syndeton of above-mentioned printed board, with the edge of the main printed board that is connected to the suspension printed board closely, form the connection interconnection of many pectination forms.
Above structural limitations is near the interconnection interval at the edge of main printed board, and extreme reduces to connect the interconnect pitch of interconnection.Therefore, connection is interconnected in the part that is connected to the suspension printed board and must has high dimensional accuracy.
In addition, the hard disk drive of high density structure has the interconnection quantity of the increase that is caused by head core.This requires the further precision of improving in the main printed board.
Although utilize the printed board manufacturing approach of the method that removes to obtain high flexibility, so it has reduced the precision on the shape and size of interconnection because of forming interconnection through etching.For example; When printed board has thickness when being the conductive layer of 12 μ m to 18 μ m; The method of removing can not easily provide has 30 μ m or less than the interconnect width of 30 μ m and 30 μ m or less than the interconnection high precision interconnection at interval of 30 μ m, and the increase of the quantity that can not allow to interconnect.Therefore, can imagine through providing the additive process (additive) that highly accurately interconnects to make main printed board.
In additive process, above the part that covers without conductive layer of insulation course substrate, form resist layer, and on the part that does not cover, carry out metallide or plated by electroless plating to form interconnection pattern with resist layer.In additive process, pattern resolution that can resist layer is set to higher, can form thus to have 30 μ m or less than the interconnect width of 30 μ m and 30 μ m or less than the interconnection accurate interconnection at interval of 30 μ m, and can further improve interconnection density.
Yet the printed board that is formed by additive process has the interconnection that on the surface of dielectric substrate, forms through electrochemical plating, and therefore the bond strength between interconnection and the dielectric substrate is low.Therefore, when repeat to interconnect crooked the time, be easy to the problem that occurs interconnecting and peel off or rupture.Therefore, in the part that makes printed board bending repeatedly and distortion, it is inappropriate using this printed board.Be difficult to be used as through the printed board that additive process is made the main printed board of hard disk drive.
Summary of the invention
Made the present invention for overcoming above problem; And the purpose of this invention is to provide a kind of following main printed board that is used for hard disk drive; Its permission accurately forms interconnection with high density in the part that is connected to the suspension printed board, and can guarantee to want in the part of repeated flex enough flexibilities, be flexural property.
The main printed board that is used for hard disk drive according to the present invention is fixed to the sidepiece of the carriage of the magnetic head arm of supporting swingably, has the tip side that is connected to the suspension printed board, and has the base end side that extends flexiblely.Main printed board comprises the fixed part that is fixed on the carriage sidepiece and is connected to the suspension printed board, and the extension that extends from the base end side of fixed part.Form fixed part and extension through different manufacturing approaches respectively, and main printed board also comprises the connecting portion that fixed part is connected together with extension.
According to the present invention, opposite with the traditional structure that is formed by a printed board, main printed board is formed by two members.
Fixed part is fixed on the carriage sidepiece, and is fixed in the suspension printed board.Therefore, preferably through making printed board with the method that high density forms accurate interconnection.Therefore, can form fixed part through additive process or equivalent method.Fixed part neither bending is also indeformable.Therefore, flexible printed circuit not only can be adopted, and the rigid printed board that forms by hard substrate etc. can be adopted.The employing of additive process allows to form intensive interconnection, and it has 30 μ m or less than the interconnect width of 30 μ m and 30 μ m or less than the interconnection of 30 μ m at interval.
Extension is according to the swing of carriage and crooked and distortion, and therefore must have flexibility.Therefore, the flexible printed circuit that method that removes that preferably will be through obtaining high flexibility or equivalent method form is as extension.Have the connection interconnection that forms by the conductive layer that is pre-attached on the dielectric substrate through the flexible printed circuit that removes manufactured, and therefore have high flexibility.Therefore, through will can being provided for the main printed board of hard disk drive by the flexible printed circuit that removes manufactured as extension, it can not cause the problem of the fracture of wiring etc., and has high reliability.Extension has than is connected to the big interconnection interval nargin of tip side of the fixed part of suspension printed board.Therefore, the density of interconnection and precision can be lower than the density and the precision of fixed part.Therefore, employing can not constitute problem through the flexible printed circuit that removes manufactured.
Be used for the main printed board of hard disk drive, fixed part comprises enhancement Layer.
Fixed part is connected to the suspension printed board, and is fixed on the carriage sidepiece.Therefore, fixed part need have following intensity, and it can remain connected to the suspension printed board of this fixed part, and allows the location of carriage sidepiece and fixing.Traditionally, will be attached on the fixed part that is fixed to the main printed board on the carriage by sheet or the tabular stiffener that stainless steel or aluminium are processed.
In invention, owing to can make fixed part independently with extension, so the location of stiffener etc. can be easy, and manufacturing step can be simple.In addition, can have betwixt and on sheet or tabular substrate, integrally form interconnection under the situation of insulation course, make interconnection structure can have enough intensity and high precision.Can enhancement Layer be used to guarantee shape retention properties and elasticity.In this case, enhancement Layer can have the characteristic of different fixing portion, and the function that therefore can not hinder fixed part.
Do not limit the material of enhancement Layer especially.It can be processed by the Metal Flake or board-like material such as stainless steel, aluminium etc.Enhancement Layer can be sheet or tabular resin sheet.
Fixed part is connected at the connecting portion place with extension.Do not limit the structure of connecting portion especially.It can adopt such as anisotropic conductive film, heat adhere to, the various connected modes of welding and USB (ultrasonic soldering).
For example, connecting portion (syndeton) comprises first connection pads and second connection pads that is arranged on the edge of extension on the edge that is arranged in fixed part.First and second connection pads combine with overlapping mode.
With the area arrangements of the connecting portion of main printed board is the regional big interconnect edge nargin that has than connecting the suspension printed board.Therefore, can variety of way be used to form connecting portion.
Hard disk drive according to the present invention comprises the aforementioned main printed board that is used for hard disk drive.
As stated, the main printed board that is used for hard disk drive according to the present invention allows to form accurate interconnection in the zone that the suspension printed board is connected to, and can guarantee the flexibility in its base end part.
In conjunction with accompanying drawing, the detailed description below the present invention, aforementioned purpose, characteristic, aspect and advantage with other of the present invention will become more obvious.
Description of drawings
Fig. 1 illustrates the planimetric map of having used according to the inner structure of the hard disk of the syndeton of printed board of the present invention.
Fig. 2 is the planimetric map of the magnetic head arm of hard disk shown in Figure 1.
Fig. 3 is the right side view of magnetic head arm shown in Figure 2.
Fig. 4 is the amplification view of main printed board shown in Figure 3.
Fig. 5 is the skeleton view that the major part of suspension printed board connecting portion shown in Figure 3 is shown with magni-scale.
Fig. 6 illustrates along the cross-sectional view of the major part of the line VI-VI intercepting of Fig. 4 with magni-scale.
Fig. 7 schematically shows the manufacturing step of the fixed part of main printed board.
Fig. 8 schematically shows the manufacturing step of the extension of main printed board.
Embodiment
Referring now to accompanying drawing embodiments of the invention are described.In following explanation, part identical or correspondence has identical drawing reference numeral, and does not repeat their explanation.
With reference to figure 1, hard disk drive 1 comprises housing 2, be arranged in be used for beared information in the housing 2 and by the motor supporting so that a plurality of disks 3 of rotation and be arranged in housing 2 and be used for reading information and information being write the head core on the disk 3 from disk 3.Head core is kept by the magnetic head arm that is used on magnetic disk surface, swinging 4.
Shown in Fig. 2 and 3, magnetic head arm 4 comprises: carriage 7, and they can be through the voice coil motor 6 that is arranged in its base end part place around axle 13 swings; With suspension 9, it is arranged on the arm 8 of carriage 7.Aforementioned head core (not shown) is kept by the magnetic head on the top that is arranged in suspension 9 10.
Head core is connected in the suspension printed board 11 (that is, being used for the printed board of suspension) of arranging along suspension 9 and goes up the connection interconnection 12 that forms, and through interconnection 12 transmission information.Suspension printed board 11 extends through the core of suspension 9 towards the oscillation centre 13 of arm 8, and the part that is positioned at the center section of suspension 9 is extended to the sidepiece of carriage 7.The base portion of suspension printed board 11 is connected to the main printed board 15 on the sidepiece that is fixed to carriage 7.
As shown in Figure 3, in this embodiment, three double sided disks 3 by rotatably mounted, and are arranged in the outside of disk 3 with suspension 9 with the mode that has predetermined interval H between them, and are disposed among the corresponding interval H.Suspension 9 on each outside is provided with suspension printed board 11, and this suspension printed board 11 has the magnetic head 10 relative with disk on the opposite side of disk.A pair of suspension 9 likewise is arranged among the interval H of center section, and these suspensions 9 keep by following suspension printed board 11, this suspension printed board 11 is respectively arranged with the magnetic head 10 relative with magnetic disk surface on opposite side.
Fig. 4 is the zoomed-in view of major part shown in Figure 3.Fig. 5 is the relevant expansion skeleton view of syndeton with main printed board 15 and suspension printed board 11.
Shown in these figures, the extension 15b of the flexible long rectangular shape that extends by the rectangle fixed part 15a on the sidepiece that is fixed to carriage 7 with from fixed part 15a according to the main printed board 15 of embodiment forms.Fixed part 15a and extension 15b integrally link together via connecting portion 41.
Fixed part 15a has rectangular shape, and the heart partly is provided with the amplification circuit 16 that is used for the signal amplification therein.In addition, be provided with at its top end and be used for the suspension printed board connecting portion 17 that is connected with suspension printed board 11.
Suspension printed board connecting portion 17 has perpendicular to two slit 18a at the edge on top and the rectangular recessed 18b that on the opposite side of suspension printed board connecting portion 17, forms respectively.Each adjoining edge 20a and the 20b of slit 18a and recessed 18b are provided with a plurality of connection pads 19, and it is opened with predetermined space interval each other, and the connection pads 31 that forms with top end in the connection interconnection 12 of compliance in suspension printed board 11 is corresponding.Interconnection 21 extends through the zone between adjoining edge 20a and the 20b from connection pads 19, and is connected to amplification circuit 16.The connecting portion 32 of suspension printed board 11 relatively also contacts with it with 20b with adjoining edge 20a, and the solder bond that the connection pads 19 of main printed board 15 is passed through to use with bridge shape form with the connection pads 31 of suspension printed board 11 arrives.
The fixed part side connecting portion 41a (that is the connecting portion on the fixed part side) that forms connecting portion 41 is arranged on the edge away from suspension printed board connecting portion 17 of fixed part 15a.Through circular connection pads 43 being arranged in from this fixed part side connecting portion of top formation 41a of the connection interconnection 42 of amplification circuit extension.
Be used for being arranged in side away from the extension 15b of extension side connecting portion 41b through the connector part 46 that connects interconnection 44 input/output signals.In this embodiment, through 44 vertical curve that the connection of longitudinal extension through extension 15b interconnected, form connector part 46.
As shown in Figure 6, fixed part 15a comprise the enhancement Layer 48 processed by metal material, by the insulation course of processing at the polyimide resin film of stratification above the enhancement Layer 48 22, above insulation course 22 stratification and the insulating coating 26 that is provided with the conductive layer 24 that connects interconnection 42, connection pads 43 etc. and covers conductive layers 24 across tack coat 25.Insulating coating 26 through removing on each connection pads 19 exposes connection pads 19.
As shown in Figure 6, the connection pads 45 of the connection pads of fixed part 15a 43 and extension 15b is overlapping and combine with the mode that has solder layer 58 therebetween, makes fixed part 15a become integral body with extension 15b.
Through the fixed part 15a of additive process manufacturing according to embodiment.Fig. 7 schematically shows the manufacturing approach according to the fixed part of embodiment.
Shown in Fig. 7 (a), additive process is used through enhancement Layer 48 and insulation course 22 are covered the base component for preparing together.Preferably will be used as enhancement Layer 48 such as the sheet metal or the metal forming of stainless steel substrates.For example, can be with polyimide resin film etc. as insulation course 22.Can be with another resin plate etc. as stiffening plate, and can in step after a while, adhere to this another resin plate.
Shown in Fig. 7 (b), on the part that does not form conductive layer 24 of insulation course 22, that is, do not forming formation resist layer 55 on interconnection 42, connection pads 43 and other the part.Shown in Fig. 7 (c), on the part that does not cover, realize metallide or plated by electroless plating with resist layer.This form to connect interconnection 21 and 42, connection pads 19 and 43 etc.Shown in Fig. 7 (d), remove resist layer 55 then, and arrange the insulating coating 26 that forms by polyimide resin film etc. with the tack coat 25 that inserts.
In the printed board of making through additive process, resist layer can have accurate patterns, makes that connecting interconnection can have high interconnection density and high precision.Therefore; When fixed part 15a uses the printed board of making through above additive process; Be used for can being equipped with interconnection 21 and connection pads 19 to the pectination connecting portion 17 of the connection of flexible printed circuit, this interconnection 21 and connection pads 19 have 30 μ m or less than the little interconnect width of 30 μ m and 30 μ m or less than the interconnection interval of 30 μ m.Therefore, this structure can be dealt with the increase that connects interconnection quantity.
Yet as stated, through electrochemical plating, additive process is formed on the insulation course 22 and forms the conductive layer 24 that connects interconnection etc., make that the bond strength between insulation course 22 and the conductive layer 24 is low, and anti-crooked persistence is lower.Yet, in an embodiment, fixed part 15a is fixed on the sidepiece of carriage 7, therefore need not have anti-crooked persistence, make can not go wrong.In addition, embodiment has the enhancement Layer 48 of integral arrangement, makes embodiment can be strengthened to the constant intensity of carriage 7 and with respect to the bearing accuracy of suspension printed board.Form the base component of enhancement Layer 48 owing to will connect interconnection grade, so need not be used to adhere to the subsequent step of enhancement Layer etc.
Fig. 8 shows the method for making extension 15b.Make this extension 15b through removing method etc.
Shown in Fig. 8 (a); Remove the method utilization and make printed board as the layergram that following mode forms that passes through of base component; That is, form this layergram through covering such as the conductive layer 51 of Copper Foil in advance on the insulation course of processing by polyimide resin film etc. 50.
Shown in Fig. 8 (b),, will form and cover on the surface of conductive layer 51 with the resist layer 56 that interconnection and connection pads carried out patterning accordingly through print process etc.Therefore, on the surface of the part that will form interconnection of conductive layer 51, form resist layer 56.Shown in Fig. 8 (c), remove the part that does not cover of conductive layer 51 with the metal protection etching solution with resist layer 56.Therefore, with resist layer 56 form accordingly be connected the interconnection etc.Shown in Fig. 8 (d), remove resist layer 56 then, and shown in Fig. 8 (e), arrange insulating coating 52 thereafter with the tack coat 57 that inserts.Replace utilizing above-mentioned print process to form the resist method of patterning, can use the conductive layer that scribbles photoresist, and can be through after exposure, form the connection interconnection pattern of resist layer with the dissolution with solvents resist layer.
Because the flat member by having the conductive layer 51 that covers in advance forms; So have high flexibility through the above extension 15b that removes manufactured; Therefore even and when make extension 15b repeated flex, conductive layer 51 and insulation course 50 are also peeled off each other hardly.Therefore, extension 15b is suitable for being used for the extension according to the main printed board of the hard disk drive of embodiment.Because form through removing the interconnection pattern that method forms through etching conductive layer 51, so the ratio of precision of interconnection pattern is low through the precision that additive process obtains interconnection pattern, but the interconnection density among the extension 15b is not high, makes can not go wrong.
As stated, embodiment adopts the printed board of making through additive process as fixed part 15a, and adopts printed board through removing manufactured as extension 15b.These fixed parts 15a and extension 15b integrally link together through connecting portion 41.Through adopting this structure, fixed part 15a can be used to be connected suspension printed board 11 with high-precision interconnection with high interconnection density, and allows to connect the increase of interconnection.In addition, extension 15b has high flexibility, make peeling off and rupturing of interconnection not occur connecting, and interconnection can have high reliability.
Above-mentioned additive process with remove the example that method only is a manufacturing approach, can obtain this structure through adopting another manufacturing approach to connect printed board.
Through adopting, can arrange a large amount of interconnection with high precision, and can make and be used for the persistent main printed board of the high anti-bending of having of hard disk drive according to printed board of the present invention.
Although specified with diagram the present invention, should know to be understood that only as illustration and example and not conduct restriction, scope of the present invention is explained by accompanying claims for it.
Claims (5)
1. main printed board that is used for hard disk drive, it is fixed to the sidepiece of the carriage of the magnetic head arm of supporting swingably, and has the tip side that is connected to the suspension printed board and have the base end side that extends flexiblely, and this main printed board comprises:
Fixed part, this fixed part are fixed to said carriage sidepiece and are connected to said suspension printed board; And
Extension, this extension extends from the base end side of said fixed part, wherein,
Form said fixed part and said extension through different manufacturing approaches respectively; Wherein, Form said fixed part than said extension with the method that high density forms accurate interconnection, and form said extension than the method for the high flexibility of said fixed part utilization acquisition, and
Said main printed board also comprises and is used for connecting portion that said fixed part is connected together with said extension.
2. the main printed board that is used for hard disk drive according to claim 1, wherein,
The printed board of said fixed part for forming through additive process, and
Said extension is through removing the flexible printed circuit that method forms.
3. the main printed board that is used for hard disk drive according to claim 1, wherein,
Said fixed part comprises enhancement Layer.
4. the main printed board that is used for hard disk drive according to claim 1, wherein,
Said connecting portion comprises:
First connection pads, it is arranged on the edge of said fixed part, and
Second connection pads, it is arranged on the edge of said extension; And
Said first connection pads and second connection pads combine with overlap mode.
5. hard disk drive comprises:
The main printed board that is used for hard disk drive according to claim 1.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008294227A JP5589238B2 (en) | 2008-11-18 | 2008-11-18 | Main printed wiring board for hard disk device and hard disk device |
| JP2008-294227 | 2008-11-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101740042A CN101740042A (en) | 2010-06-16 |
| CN101740042B true CN101740042B (en) | 2012-08-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009102252504A Expired - Fee Related CN101740042B (en) | 2008-11-18 | 2009-11-18 | Main printed board for hard disc driver and hard disc driver thereof |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP5589238B2 (en) |
| CN (1) | CN101740042B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5924187A (en) * | 1998-01-06 | 1999-07-20 | Hutchinson Technology Incorporated | Integrated lead head suspension assembly having an etched laminated load beam and flexure with deposited conductors |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001516120A (en) * | 1997-09-05 | 2001-09-25 | シーゲイト テクノロジー エルエルシー | Magnetic disk drive assembly |
| JP4222885B2 (en) * | 2003-06-04 | 2009-02-12 | 日東電工株式会社 | Printed circuit board |
-
2008
- 2008-11-18 JP JP2008294227A patent/JP5589238B2/en active Active
-
2009
- 2009-11-18 CN CN2009102252504A patent/CN101740042B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5924187A (en) * | 1998-01-06 | 1999-07-20 | Hutchinson Technology Incorporated | Integrated lead head suspension assembly having an etched laminated load beam and flexure with deposited conductors |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2008－59663A 2008.03.13 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5589238B2 (en) | 2014-09-17 |
| JP2010123656A (en) | 2010-06-03 |
| CN101740042A (en) | 2010-06-16 |
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Granted publication date: 20120829 Termination date: 20181118 |
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