JP5497366B2 - Connection structure of printed wiring board, connection structure of printed wiring board in hard disk device, and electronic device - Google Patents

Description

  The present invention relates to a printed wiring board connection structure, a printed wiring board connection structure in a hard disk device, and an electronic apparatus.

  For example, a hard disk device that is widely used as a computer storage device includes a magnetic disk on which information is recorded and supported rotatably by a motor, and a head core that reads and writes information from and to the magnetic disk. The The head core is held by a head stack assembly so that the head core can swing on the surface of the magnetic disk.

  The head stack assembly includes a carriage supported by a voice coil motor (VCM) so as to be swingable about an axis, and a suspension provided on an arm portion of the carriage, and a magnetic head provided on a tip portion of the suspension. The head core is held on the part.

  The head core is connected to a wiring formed on a suspension printed wiring board provided along the suspension, and information is read and written through the wiring. The suspension printed wiring board extends through the central portion of the suspension toward the swing axis of the arm portion, and is drawn out to the side portion of the carriage at the intermediate portion of the arm portion. The base end portion of the suspension printed wiring board is connected to the front end portion of the main printed wiring board fixed to the side portion of the carriage.

  The base end of the main printed wiring board is extended to the opposite side of the suspension printed wiring board, and is connected to a printed wiring board for amplification provided in the hard disk device or a connector for outputting a signal to the outside. Has been.

  In recent years, with the spread of the Internet and the like, an increase in the amount of information processing in computers and an increase in information processing speed are required. As a result, the hard disk drive is also required to have a large capacity and a high information transmission speed.

  In order to satisfy the above requirements, the read and write signals are increased in frequency.

JP 2006-202359 A

  When the frequency of the digital signal flowing through the printed wiring board is increased, there are problems such as interference in the signal flowing through the wiring and an increase in transmission loss. For this reason, as described in the above patent document, a ground wiring is provided on the printed wiring board, and a metal thin plate or the like as a conductive layer is provided via an insulating layer to connect the ground wiring and the conductive layer. Often a configuration is employed. By adopting this configuration, it is possible to reduce interference between signal wirings and improve frequency characteristics and the like.

  Furthermore, noise and crosstalk can be effectively prevented by adopting a differential transmission method with double signal wiring. The differential transmission method is a method in which a single signal is converted into two signals of a rank phase and an opposite phase, and the signal is transmitted by two signal wirings that are close to each other in parallel.

  However, in order to employ the above-described differential transmission method, it is necessary to have twice as many wirings and connection electrodes as conventional single-line wirings, and it is necessary to provide wirings in the order and phase opposite to each other. However, in many cases, in order to provide the wirings of the order phase and the opposite phase close to each other, the wirings must be provided so as to straddle other wirings. For this reason, it has been difficult to provide differential transmission wiring on a single printed wiring board.

  In the present invention, by connecting a plurality of printed wiring boards via an anisotropic conductive adhesive, the transmission path of the signal wiring can be easily doubled, and the impedance can be reduced when transmitting a high-frequency digital signal or the like. It is an object of the present invention to provide a printed wiring board connection structure capable of reducing transmission loss and effectively preventing crosstalk between wirings to increase the bandwidth.

The invention described in claim 1 of the present application is a first printed wiring board provided with at least two or more signal wirings, and a second printed wiring board provided with two or more branch wirings for making each signal wiring double. The printed wiring board is connected to the printed wiring board via an anisotropic conductive adhesive, and a connection electrode is provided at each end of each branch wiring corresponding to each signal wiring. while there, the ends of the signal lines, and a plurality of connecting portions facing the connection electrode of the respective branch lines, the connection electrode and a short circuit portion is short-circuited these connection portions are provided respectively, above The short-circuit portion is formed so as to pass through a position retracted from the vicinity of the connection portion, and at a position retracted from the vicinity of the connection portion of the short-circuit portion of the connection electrode connected to one signal wiring , Other signal wiring By placing a portion of the connected branch lines to want extend over the short circuit portion, the second printed connection of the printed circuit board the signal lines different branch wiring that is connected adjacent the circuit board It concerns the structure.

  In the present invention, at least two or more signal wirings that are branched into the first printed wiring board to be doubled are provided. On the other hand, the second printed wiring board is provided with a branch wiring for making each signal wiring double. Note that it is not necessary to double all the signal wirings of the first printed wiring board, as long as at least two signal wirings can be doubled.

  A connection electrode including a connection portion facing the connection electrode of each branch wiring and a short-circuit portion obtained by short-circuiting the connection portions is provided at an end portion of the signal wiring. By providing the short circuit part, the connection part connected through the short circuit part functions as one connection electrode. With this configuration, connection electrodes provided on two or more branch wirings of the second printed wiring board can be connected to one connection electrode of the first printed wiring board. Thereby, the signal wiring of the first printed wiring board can be branched into two or more branch wirings in the second printed wiring board.

  Moreover, in this invention, it arrange | positions so that a part of branch wiring connected to another signal wiring may straddle the said short circuit part of the connection electrode connected to one signal wiring. By adopting this configuration, branch lines branched from different signal lines can be arranged adjacent to each other or close to each other. As a result, for example, in a differential transmission system, it is possible to transmit a signal in the order of phase and a signal in the opposite phase via the branch wiring arranged adjacent to or in close proximity to generate noise or other wiring. It is possible to effectively prevent the occurrence of crosstalk. In addition, by using double lines, it is possible to reduce impedance, reduce power consumption, and reduce transmission loss.

In the present gun invention, so as to straddle the short-circuit portion, the branch wiring connected to the other signal lines are stacked. In the short-circuit portion, the other branch wiring and the insulating cover layer are laminated, and unevenness is increased with respect to other portions of the connection electrode.

On the other hand, each electrode of the present invention is connected by an anisotropic conductive adhesive. For this reason, if the unevenness is present in the vicinity of the connection portion, the anisotropic conductive adhesive cannot be sufficiently sandwiched between the connection portion and the electrode connected thereto, and the reliability of electrical connection is reduced. May be reduced. In this invention, the said short circuit part is formed so that it may pass through the position evacuated from the said connection part vicinity. Further, at a position where the short-circuit portion of the connection electrode connected to one signal wiring is retracted from the vicinity of the connection portion, a part of the branch wiring connected to another signal wiring is straddled over the short-circuit portion. due to the arrangement, it becomes possible to avoid the above disadvantages.

  In the printed wiring board connection structure, the form of each branch wiring of the second printed wiring board is not particularly limited. For example, a pair of wirings for transmitting signals in the opposite phase and the opposite phase can be provided in parallel on the surface of the second printed wiring board via a predetermined gap. Further, the pair of branch wirings can be provided by being laminated in the thickness direction of the wiring board via an insulating layer. Thereby, the distance between the pair of branch wirings can be set small, and the generation of noise and the occurrence of crosstalk with other wirings can be effectively prevented.

  Further, the number of the branch wirings is not particularly limited. Three or more branches can be provided for one signal wiring. Further, the form and position of the connection electrode provided at the end of the branch wiring are not particularly limited. For example, connection electrodes connected to different signal wirings can be provided in a shifted manner in the longitudinal direction of the wiring. By adopting this configuration, the connection electrode on the branch wiring side and the connection electrode provided on the signal wiring can be reliably connected by the anisotropic conductive adhesive.

  The types of the first printed wiring board and the second printed wiring board are not particularly limited. The present invention can be applied not only to connection between flexible printed wiring boards, but also to a connection structure between a rigid printed wiring board and a flexible printed wiring board, or a connection structure between rigid printed wiring boards.

  The anisotropic conductive adhesive is constituted by orienting and dispersing conductive particles and the like in an insulating resin composition. The anisotropic conductive adhesive is sandwiched between opposed electrodes and heated and pressed to cause the resin in the adhesive to flow and seal the electrode surface. Adhesion is performed in a state in which electrical connection is achieved by biting between the opposing electrodes. Thereby, the electrode which opposes can be electrically connected, ensuring the insulation between adjacent electrodes. The kind of the anisotropic conductive adhesive is not particularly limited, and anisotropic conductive adhesives having various configurations and forms can be employed. For example, a paste-like anisotropic conductive adhesive or a film-like anisotropic conductive adhesive can be employed.

  The form of the short-circuit part is not particularly limited as long as two or more connection parts are electrically connected to function as one connection electrode.

Moreover, various forms can be adopted to pass the position where the short-circuit portion is retracted from the connection portion. For example, each connection part is provided independently and wiring is drawn out from the connection part so that it passes through a position away from the connection part to short-circuit these connection parts and at a position away from the connection part. The branch wirings corresponding to the other signal wirings can be stacked so as to straddle the short-circuit portion.

Further, as in the invention described in claim 2, the connection electrode provided at the end of the signal wiring is cut off at an intermediate portion of the connection portion to which two or more branch wirings are respectively connected. A configuration in which the short-circuit portion passes through the position retracted from the connection portion can be provided. If the said structure is employ | adopted, since the said electrode does not exist in the area | region between the notch connection parts, only branch wiring will be arrange | positioned. Accordingly, the unevenness in the intermediate portion is reduced accordingly. For this reason, it becomes possible to perform the connection by sufficiently sandwiching the anisotropic conductive adhesive between the opposing electrodes, and the reliability of the electrical connection can be improved.

  The invention described in claim 3 is a printed wiring board connection structure in a hard disk device, and includes a tip side printed wiring board provided with a signal wiring connected to the head core on a suspension holding the head core at the tip. A relay printed wiring board provided with two or more branch wirings for making the signal wiring double-lined, and a proximal-side printed wiring board having a signal wiring integrated with the double-wired wiring, One or both of the connection structure between the printed wiring board for use and the printed wiring board at the front end and the connection structure between the printed wiring board for relay and the printed wiring board at the proximal end are defined in claim 1 or claim 2. Or a printed wiring board connection structure in a hard disk device provided with the connection structure described in any of the above.

  A hard disk device has a configuration in which a plurality of suspensions that are inserted between a plurality of magnetic disks and hold a head core that reads and writes information are held through gaps corresponding to the small gaps between the magnetic disks. A suspension printed wiring board having signal wirings connected to the head core is provided on the front and back surfaces of each suspension. When high-frequency digital signals are used in order to speed up reading and writing of information with respect to the magnetic disk, noise and crosstalk are likely to occur in the wiring of the suspension printed wiring board.

  In the invention described in this claim, the print for relay in which the suspension is provided with a front end-side printed wiring board having a signal wiring connected to the head core and two or more branch wirings for doubling the signal wiring. Provided are a wiring board and a base-side printed wiring board provided with a signal wiring in which the double-wired wiring is integrated, and each printed wiring board is configured to be connected using the connection structure described above. .

  By adopting the above configuration, signal wiring can be doubled in the printed wiring board portion for relay. For this reason, by adopting the differential transmission method described above, it is possible to transmit a signal having a phase opposite to the rank phase to the adjacent branch wiring. This makes it possible to prevent noise and crosstalk from occurring in the relay printed wiring board, and to increase the access speed of the hard disk device to the magnetic disk.

  The device to which the printed wiring board connection structure according to the present invention can be applied is not limited to the hard disk device, and can be applied to various electric devices as in the invention described in claim 5. For example, the connection structure according to the present invention can be employed in measuring devices and medical devices that require high-frequency characteristics.

  By employing the connection structure of the present invention, it is possible to prevent noise and crosstalk from occurring when transmitting a high-frequency signal, and to reduce transmission signal loss.

It is a top view which shows the internal structure of the hard disk drive to which the connection structure concerning this invention is applied. FIG. 3 is a plan view of a head stack assembly of the hard disk device shown in FIG. 2. It is sectional drawing which follows the III-III line | wire in FIG. 2, and is a figure which shows the schematic cross section of the connection structure of a printed wiring board. It is a whole perspective view which shows the state just before connecting a printed wiring board. It is a top view which shows the connection state of wiring and a connection electrode. It is sectional drawing which follows the VI-VI line in FIG. It is sectional drawing which follows the VII-VII line in FIG. It is sectional drawing which follows the VIII-VIII line in FIG. It is sectional drawing which follows the IX-IX line in FIG. It is sectional drawing which follows the XX line in FIG. It is a whole perspective view which shows 2nd Embodiment which concerns on this invention. It is a whole perspective view which shows 3rd Embodiment which concerns on this invention. It is a partial cross section figure which follows the XIII-XIII line | wire in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present embodiment is an example in which the printed wiring board connection structure according to the present invention is applied to the printed wiring board connection structure of the hard disk device 1.

  FIG. 1 is a plan view of a hard disk device 1 to which the present invention is applied. The hard disk device 1 includes a plurality of magnetic disks 3 in which information is recorded and rotatably supported by a motor, and a head core (not shown) that reads / writes information from / to the magnetic disks 3 in a case 2. The head core is held by the head stack assembly 4 so that it can swing on the surface of the magnetic disk.

  The head stack assembly 4 includes a carriage 7 supported so as to be swingable around a swing shaft 13 by a voice coil motor 6 provided at a base end portion, and a suspension 9 provided on an arm portion 8 of the carriage 7. And a magnetic head portion 10 is provided at the tip portion of the suspension 9. The magnetic core 10 holds the head core.

  As shown in FIG. 2, the head portion 10 is connected to a wiring formed on a suspension printed wiring board 11 provided along the suspension 9, and information is exchanged via this wiring. The suspension printed wiring board 11 extends from the central portion of the suspension 9 toward the swing shaft 13 of the arm portion 8 and is pulled out to the side of the carriage 7 in the vicinity of the swing shaft 13. The base end portion of the suspension printed wiring board 11 is connected to the main printed wiring board 15 fixed to the side portion of the carriage 7. Although not shown, the carriage 7 holds a plurality of thin plate-like suspensions each holding a head core on both surfaces of the front end portion with a predetermined gap, and is swung in the gap between the magnetic disks. Information is read from and written to the magnetic disk 3.

  As shown in FIG. 2 and FIG. 3, in the present embodiment, the suspension printed wiring board 11 is connected to the distal-end printed wiring board 21 connected to the head core and the proximal-end side connected to the main wiring board 15. The printed wiring board 23 includes three printed wiring boards: a printed wiring board 23 and a relay printed wiring board 22 provided in an intermediate portion of the printed wiring boards. As the three printed wiring boards, flexible printed wiring boards are adopted, and these wiring boards are provided with anisotropic conductive adhesive 24 at both ends of the relay printed wiring board 22 disposed on the suspension. Connected through.

  As shown in FIG. 4, the front-end printed wiring board 21 includes signal wirings 31 and 32 for exchanging signals with the head core, and a ground wiring 33. Each of the wirings 31, 32, and 33 is provided on the insulating layer 26, and a conductive layer 25 formed of a thin stainless steel plate is provided on the opposite side of the insulating layer from the side on which the wirings are provided. It has been. In the figure, a printed wiring board including three wirings 31, 32, and 33 is shown as the front end side printed wiring board 21 for easy understanding, but actually, at least six wirings are provided.

  On the other hand, in the present embodiment, in order to improve the high-frequency characteristics of the signals flowing through the signal wirings 31 and 32, the signal wirings 31 and 32 of the leading-end printed wiring board 21 are doubled on the relay printed wiring board 22. Branch wirings 41a, 41b, 42a, 42b and a ground wiring 43 are provided. Each of the wirings is formed on the insulating layer 27, and an intermediate part of the wiring is covered with an insulating cover layer 28. In FIG. 4, the insulating layer 27 is drawn with a broken line for easy understanding.

  One signal wiring 31 of the front end side printed wiring board 21 is branched into double wiring branch lines 41a and 41b in the relay printed wiring board 22, and the other signal wiring 32 is double wiring. The branch lines 42a and 42b are branched.

  The branch lines 41a, 41b, 42a, 42b are arranged so that the lines branched from the signal lines 31, 32 are alternately arranged. As a result, transmission loss can be reduced and noise resistance can be improved. In particular, when the so-called differential transmission method in which one signal is transmitted by using two signals of a rank phase and an opposite phase is used for the pair of signal wirings 31 and 32 of the front end side printed wiring board 21, the above double line is used. By adopting the structure, transmission loss can be prevented and high frequency characteristics such as noise resistance can be greatly enhanced.

  Connection electrodes 44 a, 44 b, 45 a, 45 b, 46 are provided at the tips of the respective wirings 41 a, 41 b, 42 a, 42 b, 43. In addition, since the connection structure of the said printed wiring board 22 for a relay and the base end side printed wiring board 23 is comprised similarly, description is abbreviate | omitted.

  Connection electrodes 34, 35, 36 corresponding to the connection electrodes 44 a, 44 b, 45 a, 45 b, 46 of the relay printed wiring board 22 are provided at the tips of the respective wirings of the front end side printed wiring board 21. Yes.

  As shown in FIGS. 4 to 6, the connection electrode 35 of one signal wiring 32 is formed in a long shape extending in the width direction of the printed wiring board. Connection portions 35a and 35b to which the connection electrodes 45a and 45b are connected are provided at both ends. The connection portions 35a and 35b are directly short-circuited at the electrode intermediate portion. The dimension in the width direction is set corresponding to the distance between the connection electrodes 45a and 45b of the relay printed wiring board 22.

The connection electrode 34 of the other signal wiring 31 is formed in a substantially U shape in plan view with a middle portion cut away. Connection portions 34a and 34b to which the connection electrodes 44a and 44b of the relay printed wiring board 22 are connected are provided at the opposite ends of the U-shaped connection electrodes. The middle part of the U-shaped connection electrode constitutes a short circuit part 34c for short-circuiting the connection parts 34a, 34b, and passes through a position retracted from the connection parts 34a, 34b to the relay printed wiring board side. Is set to Then, the intermediate portion 34 c of the U-shaped connection electrode 34 is laminated and disposed so that the other branch wiring 42 a straddles the insulating cover layer 28. As shown in FIG. 6, the short-circuited portion 34c is laminated with the large unevenness of the other branch wiring 42a and the insulating cover layer 28 facing each other.

On the other hand, as shown in FIG. 7, since the short-circuit part 34c is provided so as to pass through a position retracted from the part where the connection parts 34a and 34b are provided, the short-circuit part 34c is not near the connection parts 34a and 34b. There is no large unevenness facing the short-circuit portion 34c, and the connection electrodes 44a and 44b of the flat branch wiring are opposed to each other.

  By adopting the above configuration, the branch wirings 41a and 41b and the branch wirings 42a and 42b that are branched and connected from the signal wirings 31 and 32 on the relay printed wiring board 22 are alternately adjacent to each other or It is possible to arrange them close to each other. As a result, for example, in a differential transmission system, it is possible to transmit a signal in the order of phase and a signal in the opposite phase via the branch wiring arranged adjacent to or in close proximity to generate noise or other wiring. It is possible to effectively prevent the occurrence of crosstalk. In addition, power consumption can be reduced and transmission loss can be reduced.

Further, since the short-circuit portion 34c of the U-shaped connection electrode 34 is provided so as to pass through a position retracted from the position where the connection portions 34a and 34b are provided, the wiring portion is straddled. In the vicinity of 34a and 34b, there is no uneven step formed by straddling the wiring. For this reason, it becomes possible to connect by making a pinching pressure act on the anisotropic conductive adhesive between each connection electrode reliably, and can electrically connect each connection electrode reliably.

  Further, in the present embodiment, the conductive layer 25 is exposed and extended from the end portion of the insulating layer 26 at the end portion of the front end side printed wiring board 21. On the other hand, the connection electrode 46 of the ground wiring 43 in the relay printed wiring board 22 is formed in a long shape extending in the longitudinal direction of the wiring board from a portion corresponding to the ground wiring connection electrode 36 in the front end side printed wiring board 21. ing. The length of the connection electrode 46 of the ground wiring 43 is set to a length reaching the extended portion of the conductive layer 25.

  The front end side printed wiring board 21 and the relay printed wiring board 22 having the above-described configuration are positioned so that the respective electrodes to be connected correspond to each other, and a predetermined shape is provided via a film-like anisotropic conductive adhesive 24. At a temperature and pressure of As a result, the anisotropic conductive adhesive flows to fill the gaps between the printed wiring boards to form an adhesive layer 24a, and the electrodes are electrically connected via the anisotropic conductive adhesive. At the same time, the printed wiring boards that contact each other are joined.

  In the present embodiment, the conductive adhesive 25 is exposed so that the end of the conductive layer 25 is exposed from the end edge of the insulating layer 26 and covers the entire end of the printed wiring board 22 for relay. Are stacked and joined.

  In addition, as shown in FIG. 10, the ground wiring connection electrode 46 in the relay printed wiring board 22 is formed in a long shape reaching the conductive layer 25. For this reason, the connection portion 46a on the distal end side of the connection electrode for ground wiring is connected to the connection electrode 36 for ground wiring on the printed wiring board 21 on the distal end side, and the connection portion 46b on the proximal end side is connected to the conductive layer 25. Connected to the connecting portion 25a. That is, in the present embodiment, the connection structure of the relay printed wiring board 22 is used to connect the corresponding electrodes, and at the same time, the ground wirings 33 and 43 provided on the surface side of each printed wiring board are The conductive layer 25 can be connected. In the present embodiment, since the insulating cover layer 28 is provided in portions corresponding to the exposed portions of the conductive layer 25 of the branch wirings 41a, 41b, 42a, and 42b in the printed wiring board 22 for relay, The branch wiring and the conductive layer 25 are not short-circuited.

  Further, since the conductive layer 25 is formed of a stainless steel plate, the strength is high, and the adhesive strength to the anisotropic conductive adhesive 24 is also high. Therefore, the conductive layer 25 is bonded and laminated over the entire area of the front end portion of the relay printed wiring board 22 to form a reinforcing structure for the connection structure between the relay printed wiring board 22 and the front end printed wiring board 21. Is done. Thereby, the reliability of electrical connection can be further improved.

  FIG. 11 shows a second embodiment of the present invention.

  In this embodiment, adjacent branch wirings 441a, 442a and 441b, 442b of the relay printed wiring board 22 are stacked in the thickness direction of the wiring board via insulating layers 428a, 428b. The connection electrodes 44a, 44b, 45a, 45b are set at the same positions as in the first embodiment.

  By adopting the above configuration, adjacent branch wirings can be brought close to each other. As a result, the high-frequency characteristics can be greatly improved, for example, when a differential transmission method is used in which signals having a phase opposite to the phase are passed through these wirings. Further, since the wiring space of the relay printed wiring board 22 can be reduced, the wiring board can be downsized and the number of wirings can be increased.

  12 and 13 show a third embodiment of the present invention.

  In this embodiment, insulating layers 26 and 626 are provided on both surfaces of the conductive layer 25, and a signal wiring and a ground wiring are provided on the insulating layer, respectively, and the first relay printed wiring board 22 and the second relay are provided. Two printed wiring boards for relay of the printed wiring board 623 are connected to both sides of the front-end side printed wiring board 21.

  Since the arrangement of each wiring and connection electrode in the connection structure in the upper part of FIG. 12 is the same as that in the first embodiment, the description thereof is omitted.

  On the lower side of the front end side printed wiring board 21, wirings 631, 632, 633 and connecting electrodes 634, 635, 636 having the same relative arrangement as the wiring and connection electrodes provided above are arranged in the longitudinal direction of the printed wiring board. It is formed by shifting the position. On the other hand, connection electrodes 644 a, 644 b, 645 a, corresponding to the connection electrodes 634, 635, 636 formed on the lower side of the front-end printed wiring board 21 are provided at the front end of the second relay printed wiring board 623. Wiring including 645b and 646 is provided.

  As shown in FIG. 12, also in the third embodiment, film-like anisotropic conductive adhesives 24 and 624 are arranged on both sides of the leading end side printed wiring board 21 to clamp each printed wiring board. Only the corresponding connection electrode can be electrically connected. In addition, the wiring of the two relay printed wiring boards 22 and 623 can be doubled. For this reason, it is possible to prevent noise and crosstalk from occurring between signals transmitted through the wirings of the printed wiring boards 22 and 623, and to reduce transmission loss.

  As shown in FIGS. 12 and 13, the insulating layer 626 is removed under the conductive layer 25 of the tip side printed wiring board 21 to the vicinity of the connection electrode. On the other hand, the ground wiring connection electrode 646 of the second relay printed wiring board 623 is formed in a long shape extending in the longitudinal direction of the printed wiring board. By adopting this configuration, when the ground wiring connection electrode 636 on the lower side of the printed wiring board 21 at the front end side is connected to the connection portion 646a of the connection electrode 646 for ground wiring on the second relay printed wiring board 623. At the same time, the connection portion 646b of the ground wiring connection electrode can be connected to the connection portion 625a of the conductive layer 25.

  By adopting the third embodiment, it is possible to form each wiring directly on both sides of the suspension thin plate via the insulating layer and use the thin plate as the conductive layer 25.

  In the above embodiment, in order to facilitate understanding, the first relay printed wiring board 22 and the second relay printed wiring board 623 connected to the front end side printed wiring board 21 are connected to the printed wiring. Although it connects so that it may connect in the position shifted in the longitudinal direction of the board, it can also comprise so that it may connect in the same position of the front and back of the front end side printed wiring board 21. FIG.

In the above embodiment, the present invention is applied to the connection structure of the printed wiring board of the hard disk device, but the present invention can be applied to the connection structure of the printed wiring board of various electronic devices that handle high-frequency digital signals and the like.

  The scope of the present invention is not limited to the embodiment described above. The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined not by the above-mentioned meaning but by the scope of the claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

  A manufacturing cost can be reduced, and a printed wiring board corresponding to a high frequency signal can be provided.

21 First printed wiring board 23 Second printed wiring board 24 Anisotropic conductive adhesive 25 Conductive layer (first printed wiring board)
25a Connection part (conductive layer)
26 Insulating layer (first printed wiring board)
27 Insulating layer (second printed wiring board)
31 Signal wiring (first printed wiring board)
34 Connection electrode (first printed wiring board)
35 Connection electrode (first printed wiring board)
36 Connection electrode (first printed wiring board)
32 Signal wiring (first printed wiring board)
34a Connection part (signal wiring)
34b Connection part (signal wiring)
34c Short-circuit part 41a Branch wiring (2nd printed wiring board)
41b Branch wiring (second printed wiring board)
42a Branch wiring (second printed wiring board)
42b Branch wiring (second printed wiring board)

Claims (5)

The first printed wiring board provided with at least two or more signal wirings and the second printed wiring board provided with two or more branch wirings for making each signal wiring doubled are anisotropically conductively bonded. A printed wiring board connection structure connected via an agent,
While connecting electrodes are provided at the ends of the branch wirings corresponding to the signal wirings,
Connection electrodes each provided with a plurality of connection portions facing the connection electrodes of the branch wires and a short-circuit portion obtained by short-circuiting the connection portions are provided at the ends of the signal wires,
The short-circuit part is formed so as to pass through a position retracted from the vicinity of the connection part,
Arranged so that part of the branch wiring connected to other signal wiring straddles the short-circuited part at a position retracted from the vicinity of the connection part of the short-circuiting part of the connection electrode connected to one signal wiring it allows the above-mentioned signal lines different in adjacent branch lines in the second printed circuit board is connected, the connection structure of the printed wiring board. The connection electrode provided at the end of the signal wiring cuts out the intermediate part of the connection part to which two or more branch wirings are respectively connected, so that the position where the short-circuit part is retracted from the connection part. The printed wiring board connection structure according to claim 1, comprising a form that passes . A printed wiring board connection structure in a hard disk device,
A printed wiring board for relay, in which a suspension having a head core held at the distal end is provided with a front-end printed wiring board having signal wiring connected to the head core, and two or more branch wirings for doubling the signal wiring. And a base-side printed wiring board including a signal wiring in which the double-wired wiring is integrated,
One or both of the connection structure between the relay printed wiring board and the distal printed wiring board and the connection structure between the relay printed wiring board and the proximal printed wiring board are defined in claim 1 or claim 2. Item 3. A printed wiring board connection structure in a hard disk device, wherein the connection structure according to any one of Items 2 is provided.   A hard disk device comprising the printed wiring board connection structure according to any one of claims 1 to 3.   An electronic apparatus comprising the printed wiring board connection structure according to claim 1.

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