Wiring circuit board

Abstract

To provide a wiring circuit board that can reinforce a connection part and can stably control the deformation of the wiring circuit board.SOLUTION: A suspension substrate 1 with a circuit extending in a predetermined direction includes a base insulating layer 3 and a conductor layer 4 arranged on one side of the base insulating layer 3 in a thickness direction. The base insulating layer 3 includes a first main body base 31 and a second main body base 32 that are arranged at intervals in the width direction, and a connecting portion 33 connecting a part of the first main body base 31 in a longitudinal direction and a part of the second main body base 32 in the longitudinal direction. Then, the suspension substrate 1 with the circuit further includes a reinforcing portion 10 that is arranged on the surface of the connecting portion 33 and reinforces the connecting portion 33. The reinforcing portion 10 includes two or more resin layers or metal members laminated in the thickness direction.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a wiring circuit board.

Background Art

[0002] Wiring circuit boards are used in various industrial products such as electronic and electrical devices. As such wiring circuit boards, for example, flexible printed wiring boards, flexible printed wiring boards with a reinforcing layer, circuit-equipped suspension substrates with a suspension (spring) layer, and the like are known.

[0003] For example, a suspension has been proposed that includes a metal layer, a dielectric layer, and a copper layer that constitutes a transmission wiring, in this order in the thickness direction of the metal layer, and the dielectric layer is laminated on the metal layer in accordance with the transmission wiring of the patterned copper layer (see, for example, Patent Document 1).

[0004] Such a dielectric layer has a pattern corresponding to the transmission wiring and has portions that are arranged at intervals from each other in the width direction orthogonal to the longitudinal direction of the suspension.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, when using the suspension described in Patent Document 1, etc., a load stress may act on the suspension and the suspension may deform. In this case, it is desirable to control the deformation of the suspension.

[0007] Therefore, in the dielectric layer provided in the suspension described in Patent Document 1, it is considered to provide a connecting portion that connects portions arranged at intervals in the width direction.

[0008] However, even if a connecting portion is provided in the dielectric layer, there is a risk that the connecting portion may be damaged due to the load stress acting on the suspension, and there is a problem that the deformation of the suspension cannot be stably controlled.

[0009] The present invention provides a wiring circuit board that can reinforce a connecting portion and stably control the deformation of the wiring circuit board.

Means for Solving the Problems

[0010] The present invention [1] is a wiring circuit board extending in a predetermined direction, comprising an insulating layer and a conductor layer disposed on one side in the thickness direction of the insulating layer. The insulating layer includes a first portion and a second portion disposed at intervals in the width direction orthogonal to the longitudinal direction of the wiring circuit board, and a connecting portion that connects a part of the first portion and a part of the second portion in the longitudinal direction. The wiring circuit board includes a reinforcing portion disposed on the surface of the connecting portion and reinforcing the connecting portion. The reinforcing portion includes two or more resin layers laminated in the thickness direction and / or a metal member.

[0011] According to such a configuration, the insulating layer includes a connecting portion that connects a part of the first portion and a part of the second portion in the longitudinal direction, and the reinforcing portion is disposed on the surface of the connecting portion. And the reinforcing portion includes two or more resin layers laminated in the thickness direction and / or a metal member. Therefore, the connecting portion can be sufficiently reinforced.

[0012] As a result, when a load stress acts on the wiring circuit board, it is possible to suppress damage to the connecting portion and stably control the deformation of the wiring circuit board.

[0013] The present invention [2] includes the wiring circuit board according to [1] above, wherein the reinforcing portion includes the metal member, and the metal member is made of the same metal as the conductor layer.

[0014] According to such a configuration, since the reinforcing portion includes the metal member, the connecting portion can be reliably reinforced. Further, since the metal member is made of the same metal as the conductor layer, the conductor layer and the metal member can be formed simultaneously in the manufacture of the wiring circuit board.

[0015] The present invention [3] includes the wiring circuit board according to [2] above, wherein the conductor layer includes wirings, and the wirings include the metal member.

[0016] According to such a configuration, since the wirings include the metal member, the number of components can be reduced as compared with a mode in which the wirings and the metal member are provided separately. Further, by performing a conduction inspection of the conductor layer, defects in the formation of the wirings and the metal member can be inspected collectively.

[0017] The present invention [4] includes the wiring circuit board according to [3] above, wherein the conductor layer includes a first terminal and a second terminal located away from the first terminal in the longitudinal direction, and the wiring includes a wiring body connecting the first terminal and the second terminal and the metal member continuous with the wiring body.

[0018] According to such a configuration, while ensuring efficient routing of the wiring body connecting the first terminal and the second terminal, the metal member continuous with the wiring body can be disposed on the connecting portion.

Advantages of the Invention

[0019] According to the wiring circuit board of the present invention, the connecting portion can be reinforced, and deformation of the wiring circuit board can be stably controlled.

Brief Description of the Drawings

[0020]

Figure 1

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Figure 10

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Figure 16

Embodiments for Carrying Out the Invention

[0021] A suspension substrate 1 with a circuit as an embodiment of the wiring circuit board of the present invention will be described with reference to FIGS. 1 to 4.

[0022] As shown in FIG. 1, the suspension substrate 1 with a circuit has a substantially flat belt shape extending in a predetermined direction.

[0023] In FIG. 1, the paper thickness direction is the thickness direction (first direction) of the suspension substrate 1 with a circuit. The front side of the paper is one side of the thickness direction (one side of the first direction), and the back side of the paper is the other side of the thickness direction (the other side of the first direction).

[0024] In FIG. 1, the paper vertical direction is the longitudinal direction (second direction orthogonal to the first direction) of the suspension substrate 1 with a circuit. The upper side of the paper is one side of the longitudinal direction (one side of the second direction), and the lower side of the paper is the other side of the longitudinal direction (the other side of the second direction).

[0025] In FIG. 1, the left - right direction of the paper surface is the width direction of the suspension substrate 1 with circuits (the third direction orthogonal to the first direction and the second direction), the right side of the paper surface is one side of the width direction (one side of the third direction), and the left side of the paper surface is the other side of the width direction (the other side of the third direction). Specifically, the direction follows the direction arrow described in each figure.

[0026] Also, hereinafter, unless otherwise specified, the thickness direction of the suspension substrate 1 with circuits is simply referred to as the thickness direction, the longitudinal direction of the suspension substrate 1 with circuits is simply referred to as the longitudinal direction, and the width direction of the suspension substrate 1 with circuits is simply referred to as the width direction. Note that the longitudinal direction is orthogonal to the thickness direction, and the width direction is orthogonal to both the longitudinal direction and the thickness direction.

[0027] The suspension substrate 1 with circuits can mount a slider 6 and a plurality of piezoelectric elements 7. The slider 6 has a magnetic head (not shown). The piezoelectric element 7 is an actuator that can expand and contract in the longitudinal direction. When electricity is supplied and its voltage is controlled, it expands and contracts. The number of piezoelectric elements 7 is not particularly limited, but in this embodiment, it is two.

[0028] The suspension substrate 1 with circuits includes a first mounting region 1A and a plurality of second mounting regions 1B.

[0029] The first mounting region 1A is a region for mounting the slider 6. The first mounting region 1A is located at one end of the suspension substrate 1 with circuits in the longitudinal direction. The first mounting region 1A is located between the plurality of second mounting regions 1B in the width direction.

[0030] The plurality of second mounting regions 1B are regions for mounting the piezoelectric elements 7. The plurality of second mounting regions 1B are spaced apart from each other in the width direction.

[0031] As shown in FIG. 2, the suspension substrate 1 with circuits includes a metal support layer 2, a base insulating layer 3 as an example of an insulating layer, a conductor layer 4, and a cover insulating layer 5 in this order from the other side to one side in the thickness direction.

[0032] 1-1. Metal support layer As shown in FIG. 1, the metal support layer 2 is a metal support that supports the conductor layer 4 and extends in the longitudinal direction. In FIG. 1, for convenience, the metal support layer 2 is shown by solid and dashed lines, the base insulation layer 3 is shown by a thick line, the conductor layer 4 is shown by a solid line, and the cover insulation layer 5 is omitted.

[0033] The metal support layer 2 includes a gimbal portion 20 and a main body portion 21.

[0034] The gimbal portion 20 is located at one end of the metal support layer 2 in the longitudinal direction. The gimbal portion 20 includes a frame portion 22, a stage 23, and a plurality of stage connection portions 24.

[0035] The frame portion 22 has a rectangular frame shape when viewed from the thickness direction and defines an opening 25. The frame portion 22 surrounds the stage 23.

[0036] The stage 23 is disposed within the opening 25 at a distance from the frame portion 22. The stage 23 has an H shape when viewed from the thickness direction. The stage 23 includes a first stage 26, a second stage 27, and a stage connection portion 28.

[0037] The first stage 26 is located at one end of the stage 23 in the longitudinal direction. The first stage 26 has a rectangular shape extending in the width direction when viewed from the thickness direction.

[0038] The second stage 27 is located at the other end of the stage 23 in the longitudinal direction. The second stage 27 is spaced from the first stage 26 on the other side in the longitudinal direction. The second stage 27 has a rectangular shape extending in the width direction when viewed from the thickness direction.

[0039] The stage connection portion 28 is located between the first stage 26 and the second stage 27 in the longitudinal direction. The stage connection portion 28 connects the central portion in the width direction of the other end edge of the first stage 26 in the longitudinal direction and the central portion in the width direction of one end edge of the second stage 27 in the longitudinal direction.

[0040] The plurality of stage connectors 24 connect the second stage 27 and the frame portion 22. Specifically, the plurality of stage connectors 24 are two stage connectors 24. The two stage connectors 24 are positioned at intervals from each other in the width direction. Among the two stage connectors 24, the stage connector 24 positioned on one side in the width direction extends continuously in the longitudinal direction from one end portion of the second stage 27 in the width direction and is connected to the frame portion 22. Among the two stage connectors 24, the stage connector 24 positioned on the other side in the width direction extends continuously in the longitudinal direction from the other end portion of the second stage 27 in the width direction and is connected to the frame portion 22.

[0041] Then, the second stage 27 and the two stage connectors 24 partition the opening 25 into a first opening 25A and a second opening 25B.

[0042] The first opening 25A is positioned on one side with respect to the second stage 27 in the longitudinal direction. The first opening 25A is defined by one end edge of the second stage 27 in the longitudinal direction, one end edge of the two stage connectors 24 in the longitudinal direction, and the inner edge of the frame portion 22. The first stage 26 and the stage connecting portion 28 are positioned within the first opening 25A.

[0043] The second opening 25B is positioned on the other side with respect to the second stage 27 in the longitudinal direction. The second opening 25B is defined by the other end edge of the second stage 27 in the longitudinal direction, the other end edge of the two stage connectors 24 in the longitudinal direction, and the inner edge of the frame portion 22.

[0044] The main body portion 21 is a portion supported by a load beam (not shown). The main body portion 21 is positioned on the other side with respect to the gimbal portion 20 in the longitudinal direction. The main body portion 21 has a flat belt shape extending in the longitudinal direction. The main body portion 21 is continuous with the other end portion of the frame portion 22 in the longitudinal direction.

[0045] Examples of the material of the metal support layer 2 include metal materials such as stainless steel. The thickness of the metal support layer 2 is not particularly limited, but for example, it is 10 μm or more and 35 μm or less.

[0046] 1-2. Base insulating layer As shown in FIG. 2, the base insulating layer 3 is disposed on one side of the metal support layer 2 in the thickness direction, specifically, on one surface of the metal support layer 2 in the thickness direction. The base insulating layer 3 has a predetermined pattern corresponding to the conductor layer 4. The base insulating layer 3 is located between the metal support layer 2 and the conductor layer 4 in the thickness direction.

[0047] As shown in FIG. 1, the base insulating layer 3 includes a stage base 30, a first main body base 31 as an example of a first part, a second main body base 32 as an example of a second part, and a connecting part 33.

[0048] The stage base 30 is located on the stage 23. The stage base 30 includes a first stage base 34, a second stage base 35, and a stage base connecting portion 36.

[0049] The first stage base 34 is located on the first stage 26. The first stage base 34 has a rectangular shape extending in the width direction when viewed from the thickness direction.

[0050] The second stage base 35 is spaced apart from the first stage base 34 on the other side in the longitudinal direction. The second stage base 35 has a rectangular shape extending in the width direction when viewed from the thickness direction. The second stage base 35 overlaps the stage connecting portion 28, one side portion of the second stage 27 in the longitudinal direction, and the two stage connection portions 24 all at once when viewed from the thickness direction.

[0051] The stage base connecting portion 36 is positioned between the first stage base 34 and the second stage base 35 in the longitudinal direction. The stage base connecting portion 36 connects the central portion in the width direction of the other end edge of the first stage base 34 in the longitudinal direction and the central portion in the width direction of one end edge of the second stage base 35 in the longitudinal direction.

[0052] The first main body base 31 and the second main body base 32 are positioned on the other side with respect to the second stage base 35 in the longitudinal direction. The first main body base 31 and the second main body base 32 are arranged at intervals from each other in the width direction.

[0053] The first main body base 31 is positioned on one side with respect to the second main body base 32 in the width direction. The first main body base 31 has a flat belt shape extending in the longitudinal direction. The first main body base 31 has a first non-support portion 31A and a first support portion 31B.

[0054] The first non-support portion 31A is positioned at one end portion of the first main body base 31 in the longitudinal direction. The first non-support portion 31A overlaps with the second opening 25B when viewed from the thickness direction. Therefore, the first non-support portion 31A is not supported by the metal support layer 2. The first non-support portion 31A has a crank shape when viewed from the thickness direction. Specifically, the first non-support portion 31A continuously extends from one end portion of the second stage base 35 in the width direction to the other side in the longitudinal direction, then bends to the other side in the width direction, and then bends to the other side in the longitudinal direction.

[0055] The first support portion 31B is positioned on the other side of the first non-support portion 31A in the longitudinal direction. The first support portion 31B overlaps with the main body portion 21 when viewed from the thickness direction. The first support portion 31B is positioned on the main body portion 21. Therefore, the first support portion 31B is supported by the main body portion 21. The first support portion 31B extends along the longitudinal direction. One end portion of the first support portion 31B in the longitudinal direction is connected to the other end portion of the first non-support portion 31A in the longitudinal direction.

[0056] The second body base 32 has a flat belt shape extending in the longitudinal direction. The second body base 32 has a second non-support part 32A and a second support part 32B.

[0057] The second non-support part 32A is located at one end of the second body base 32 in the longitudinal direction. The second non-support part 32A overlaps with the second opening 25B when viewed from the thickness direction. Therefore, the second non-support part 32A is not supported by the metal support layer 2. The second non-support part 32A is spaced apart from the first non-support part 31A on the other side in the width direction. The second non-support part 32A has a crank shape when viewed from the thickness direction. Specifically, the second non-support part 32A continuously extends from the other end of the second stage base 35 in the width direction, extends to the other side in the longitudinal direction, then bends to one side in the width direction, and then bends to the other side in the longitudinal direction.

[0058] The second support part 32B is located on the other side of the second non-support part 32A in the longitudinal direction. The second support part 32B overlaps with the main body part 21 when viewed from the thickness direction. The second support part 32B is located on the main body part 21. Therefore, the second support part 32B is supported by the main body part 21. The second support part 32B is spaced apart from the first support part 31B on the other side in the width direction. The second support part 32B extends along the longitudinal direction. One end of the second support part 32B in the longitudinal direction is connected to the other end of the second non-support part 32A in the longitudinal direction.

[0059] The connecting portion 33 connects a part of the first main body base 31 in the longitudinal direction and a part of the second main body base 32 in the longitudinal direction. More specifically, the connecting portion 33 connects a part of the first non-support portion 31A and a part of the second non-support portion 32A. The connecting portion 33 is located between the first non-support portion 31A and the second non-support portion 32A. The connecting portion 33 overlaps with the second opening 25B when viewed from the thickness direction. The connecting portion 33 has a rectangular shape extending in the width direction when viewed from the thickness direction. The connecting portion 33, the portion of the first non-support portion 31A continuous with the connecting portion 33, and the second non-support portion 32A continuous with the connecting portion 33 have an H shape when viewed from the thickness direction. In the present embodiment, the connecting portion 33 is shorter than the first non-support portion 31A and the second non-support portion 32A in the longitudinal direction. Note that the connecting portion 33 may be longer than the first non-support portion 31A and the second non-support portion 32A in the longitudinal direction.

[0060] Examples of the material of the base insulating layer 3 include synthetic resins such as polyimide resins.

[0061] The thickness of the base insulating layer 3 is not particularly limited, but is, for example, 1 μm or more and 1000 μm or less.

[0062] 1-3. Conductor Layer As shown in FIG. 2, the conductor layer 4 is disposed on one side of the base insulating layer 3 in the thickness direction, specifically, on one surface of the base insulating layer 3 in the thickness direction.

[0063] As shown in FIG. 1, the conductor layer 4 includes a first wiring pattern 40 and a second wiring pattern 41.

[0064] The first wiring pattern 40 includes a plurality of slider connection terminals 42, a plurality of external connection terminals 43, and a plurality of signal wirings 44.

[0065] When the slider 6 is mounted on the circuit-attached suspension substrate 1, the plurality of slider connection terminals 42 are electrically connected to the slider 6 via a bonding material (for example, solder).

[0066] The plurality of slider connection terminals 42 are located at one end of the circuit-attached suspension substrate 1 in the longitudinal direction. Specifically, the plurality of slider connection terminals 42 are four slider connection terminals 42. Note that the number of slider connection terminals 42 is four for convenience in this embodiment, but is not particularly limited.

[0067] The plurality of slider connection terminals 42 are arranged on the first stage base 34. In this embodiment, the plurality of slider connection terminals 42 are arranged adjacent to the first mounting region 1A. More specifically, the plurality of slider connection terminals 42 are arranged adjacent to one side of the first mounting region 1A in the longitudinal direction. Note that the plurality of slider connection terminals 42 may be arranged within the first mounting region 1A.

[0068] The plurality of slider connection terminals 42 are positioned at intervals from each other in the width direction. The plurality of slider connection terminals 42 include a plurality of first slider connection terminals 42A and a plurality of second slider connection terminals 42B. The plurality of first slider connection terminals 42A and the plurality of second slider connection terminals 42B are positioned at intervals from each other in the width direction. Specifically, the plurality of first slider connection terminals 42A are two first slider connection terminals 42A. The plurality of second slider connection terminals 42B are specifically two second slider connection terminals 42B. Note that the number of each of the first slider connection terminals 42A and the second slider connection terminals 42B is two for convenience in this embodiment, but is not particularly limited. The plurality of first slider connection terminals 42A are located on one side in the width direction, and the plurality of second slider connection terminals 42B are located on the other side in the width direction.

[0069] The plurality of external connection terminals 43 are electrically connected to an external substrate (not shown) in a state where the main body 21 is supported by a load beam (not shown).

[0070] The plurality of external connection terminals 43 are located at the other end of the circuit-equipped suspension substrate 1 in the longitudinal direction. The plurality of external connection terminals 43 are provided in the same number as the plurality of slider connection terminals 42. The plurality of external connection terminals 43 include a plurality of first external connection terminals 43A and a plurality of second external connection terminals 43B. The plurality of first external connection terminals 43A and the plurality of second external connection terminals 43B are positioned at intervals from each other in the width direction. The first external connection terminals 43A are provided in the same number as the first slider connection terminals 42A. The second external connection terminals 43B are provided in the same number as the second slider connection terminals 42B. The plurality of first external connection terminals 43A are located on one side in the width direction, and the plurality of second external connection terminals 43B are located on the other side in the width direction. The plurality of first external connection terminals 43A are arranged on the other end of the first support portion 31B in the longitudinal direction. The plurality of second external connection terminals 43B are arranged on the other end of the second support portion 32B in the longitudinal direction.

[0071] The plurality of signal wirings 44 electrically connect the plurality of slider connection terminals 42 and the plurality of external connection terminals 43. The plurality of signal wirings 44 include a plurality of first signal wirings 44A and a plurality of second signal wirings 44B. The plurality of first signal wirings 44A and the plurality of second signal wirings 44B are arranged at intervals from each other in the width direction. The plurality of first signal wirings 44A are located on one side in the width direction, and the plurality of second signal wirings 44B are located on the other side in the width direction.

[0072] The plurality of first signal wirings 44A electrically connect the plurality of first slider connection terminals 42A and the plurality of first external connection terminals 43A. The plurality of first signal wirings 44A extend in the longitudinal direction and are positioned at intervals from each other in the width direction. The first signal wiring 44A is connected to the first external connection terminal 43A by continuously passing over the first stage base 34, the second stage base 35, and the first main body base 31 in order from the first slider connection terminal 42A.

[0073] The plurality of second signal wirings 44B electrically connect the plurality of second slider connection terminals 42B and the plurality of second external connection terminals 43B. The plurality of second signal wirings 44B extend in the longitudinal direction and are spaced apart from each other in the width direction. The second signal wiring 44B continuously passes from the second slider connection terminal 42B over the first stage base 34, over the second stage base 35, and over the second main body base 32 in order and is connected to the second external connection terminal 43B.

[0074] The second wiring pattern 41 includes a plurality of element connection terminals 45, a plurality of power supply terminals 47 as an example of the second terminals, a plurality of power supply wirings 48 as an example of the wirings, and a plurality of ground wirings 49.

[0075] When the plurality of piezoelectric elements 7 are mounted on the circuit-attached suspension substrate 1, the plurality of element connection terminals 45 are electrically connected to the piezoelectric elements 7 via a bonding material (e.g., solder). Specifically, the plurality of element connection terminals 45 are four element connection terminals 45. In each second mounting region 1B, two element connection terminals 45 are arranged. Note that the number of element connection terminals 45 is four for convenience in this embodiment, but is not particularly limited.

[0076] The plurality of element connection terminals 45 arranged in each second mounting region 1B include a first element connection terminal 45A as an example of the first terminal and a second element connection terminal 45B. In other words, the first element connection terminal 45A and the second element connection terminal 45B are arranged in the second mounting region 1B. Note that the first element connection terminal 45A and the second element connection terminal 45B may be arranged adjacent to the second mounting region 1B.

[0077] The first element connection terminal 45A is located at the other end of the second mounting region 1B in the longitudinal direction. The first element connection terminal 45A is located on the other end of the second stage base 35 in the longitudinal direction. The second element connection terminal 45B is located at one end of the second mounting region 1B in the longitudinal direction. The second element connection terminal 45B is spaced apart from the first element connection terminal 45A on one side in the longitudinal direction. The second element connection terminal 45B is located on the other end of the first stage base 34 in the longitudinal direction.

[0078] The plurality of power supply terminals 47 are electrically connected to an external power supply (not shown) in a state where the main body 21 is supported by a load beam (not shown).

[0079] The plurality of power supply terminals 47 are located at the other end of the circuit-mounted suspension substrate 1 in the longitudinal direction. The plurality of power supply terminals 47 are located away from the first element connection terminal 45A in the longitudinal direction. The number of power supply terminals 47 is the same as that of the first element connection terminal 45A. The plurality of power supply terminals 47 are spaced apart from each other in the width direction. The plurality of power supply terminals 47 include a first power supply terminal 47A and a second power supply terminal 47B. The first power supply terminal 47A is located on one side in the width direction, and the second power supply terminal 47B is located on the other side in the width direction. The first power supply terminal 47A is located on the other side of the first external connection terminal 43A in the width direction. The first power supply terminal 47A is disposed on the other end of the first supported portion 31B in the longitudinal direction. The second power supply terminal 47B is located on one side of the second external connection terminal 43B in the width direction. The second power supply terminal 47B is disposed on the other end of the second supported portion 32B in the longitudinal direction.

[0080] The plurality of power supply wirings 48 include a first power supply wiring 48A and a second power supply wiring 48B. The first power supply wiring 48A and the second power supply wiring 48B are arranged spaced apart from each other in the width direction. The first power supply wiring 48A is located on one side in the width direction, and the second power supply wiring 48B is located on the other side in the width direction.

[0081] The first power supply wiring 48A includes a first wiring body 48C as an example of a wiring body and a first reinforcing wiring 48D as an example of a metal member. In other words, the first reinforcing wiring 48D is a part of the conductor layer 4 and is made of the same metal as the conductor layer 4.

[0082] The first wiring body 48C electrically connects a first element connection terminal 45A disposed on one side in the width direction among two first element connection terminals 45A and a first power supply terminal 47A. The first wiring body 48C continuously passes over the second stage base 35 and then over the first main body base 31 from the first element connection terminal 45A and is connected to the first power supply terminal 47A. The first wiring body 48C is located on the other side in the width direction with respect to the first signal wiring 44A on the first supportless portion 31A.

[0083] The first reinforcing wiring 48D is disposed on one surface of the connecting portion 33 in the thickness direction. The first reinforcing wiring 48D extends in the width direction. The first reinforcing wiring 48D branches off continuously from the first wiring body 48C located on the first supportless portion 31A and extends toward the other side in the width direction. One end portion of the first reinforcing wiring 48D in the width direction is located on the first supportless portion 31A and is connected to the first wiring body 48C. The other end portion of the first reinforcing wiring 48D in the width direction is a free end portion, that is, it is located on the second supportless portion 32A and is disposed at an interval from a second wiring body 48E described later.

[0084] The second power supply wiring 48B includes a second wiring body 48E as an example of a wiring body and a second reinforcing wiring 48F as an example of a metal member. In other words, the second reinforcing wiring 48F is a part of the conductor layer 4 and is made of the same metal as the conductor layer 4.

[0085] The second wiring body 48E electrically connects the first element connection terminal 45A, which is arranged on the other side in the width direction among the two first element connection terminals 45A, and the second power supply terminal 47B. The second wiring body 48E is continuously connected from the first element connection terminal 45A, passes through the second stage base 35 and the second main body base 32 in order, and is connected to the second power supply terminal 47B. The second wiring body 48E is located on one side in the width direction with respect to the second signal wiring 44B on the second supportless portion 32A.

[0086] The second reinforcing wiring 48F is arranged on one surface of the connecting portion 33 in the thickness direction. The second reinforcing wiring 48F is parallel to and spaced apart from the first reinforcing wiring 48D on one side in the longitudinal direction. The second reinforcing wiring 48F extends in the width direction. The second reinforcing wiring 48F branches off continuously from the second wiring body 48E located on the second supportless portion 32A and extends toward one side in the width direction. The other end portion of the second reinforcing wiring 48F in the width direction is located on the second supportless portion 32A and is connected to the second wiring body 48E. One end portion of the second reinforcing wiring 48F in the width direction is a free end portion, that is, it is located on the first supportless portion 31A and is arranged at a distance from the first wiring body 48C.

[0087] The ground wiring 49 is connected to the second element connection terminal 45B and electrically connects (grounds) the second element connection terminal 45B and the first stage 26. A plurality of ground wirings 49 are located at intervals from each other in the width direction. The ground wiring 49 extends from the second element connection terminal 45B to one side in the longitudinal direction. The ground wiring 49 contacts (grounds) the first stage 26 through a hole (not shown) provided in the first stage base 34.

[0088] Examples of the material of the conductor layer 4 include conductor materials such as copper. The thickness of the conductor layer 4 is, for example, 1 μm or more, preferably 3 μm or more, for example, 20 μm or less, preferably 12 μm or less.

[0089] 1-4. Cover Insulating Layer As shown in FIGS. 2 and 3, the cover insulating layer 5 is disposed on one side in the thickness direction of the base insulating layer 3, specifically, on one surface in the thickness direction of the base insulating layer 3 so as to cover the conductor layer 4.

[0090] The cover insulating layer 5 covers the first wiring pattern 40 so that the plurality of slider connection terminals 42 and the plurality of external connection terminals 43 are exposed. Further, the cover insulating layer 5 covers the second wiring pattern 41 so that the plurality of element connection terminals 45 and the plurality of power supply terminals 47 are exposed. As a result, as shown in FIG. 3, the cover insulating layer 5 covers the first reinforcing wiring 48D and the second reinforcing wiring 48F.

[0091] Specifically, the cover insulating layer 5 has a reinforcing cover 50. The reinforcing cover 50 is disposed on one surface in the thickness direction of the connecting portion 33 so as to cover the first reinforcing wiring 48D and the second reinforcing wiring 48F.

[0092] Examples of the material of the cover insulating layer 5 include synthetic resins such as polyimide resin. The thickness of the cover insulating layer 5 is, for example, 1 μm or more, preferably 2 μm or more, for example, 10 μm or less, preferably 8 μm or less.

[0093] 1-5. Reinforcing Portion The circuit-attached suspension substrate 1 includes a reinforcing portion 10. The reinforcing portion 10 reinforces the connecting portion 33. The reinforcing portion 10 is disposed on the surface of the connecting portion 33. More specifically, the reinforcing portion 10 is disposed on one surface of the connecting portion 33 in the thickness direction.

[0094] In the present embodiment, the reinforcing portion 10 includes the above-described first reinforcing wiring 48D, the above-described second reinforcing wiring 48F, and the above-described reinforcing cover 50.

[0095] As shown in FIGS. 1 and 3, in the circuit-mounted suspension substrate 1, the base insulating layer 3 includes a connecting portion 33 that connects a part of the first non-support portion 31A and a part of the second non-support portion 32A, and the reinforcing portion 10 is disposed on the surface of the connecting portion 33. The reinforcing portion 10 includes a first reinforcing wiring 48D and a second reinforcing wiring 48F. Therefore, the connecting portion 33 can be sufficiently reinforced.

[0096] However, the circuit-mounted suspension substrate 1 is mounted on a hard disk drive (not shown) with the slider 6 and the piezoelectric element 7 mounted thereon. The circuit-mounted suspension substrate 1 supports the magnetic head of the slider 6 while maintaining a minute gap from the magnetic disk against the air flow when the magnetic head and the magnetic disk relatively travel. At this time, if necessary, electricity is supplied to the piezoelectric element 7 to expand and contract the piezoelectric element 7, and the stage 23 is moved up and down with respect to the magnetic disk to displace the slider 6.

[0097] In this case, following the movement of the stage 23, the first non-support portion 31A and the second non-support portion 32A are deformed. As a result, a load stress may act on the connecting portion 33.

[0098] However, in the circuit-mounted suspension substrate 1, since the connecting portion 33 is sufficiently reinforced by the reinforcing portion 10, damage to the connecting portion 33 can be suppressed, and deformation of the circuit-mounted suspension substrate 1 can be stably controlled.

[0099] Further, the first reinforcing wiring 48D and the second reinforcing wiring 48F are part of the conductor layer 4 and are made of the same metal as the conductor layer 4. Therefore, in the manufacture of the circuit-mounted suspension substrate 1, the conductor layer 4 including the first reinforcing wiring 48D and the second reinforcing wiring 48F can be formed in the above pattern all at once by, for example, an additive method or a subtractive method.

[0100] Further, the first power supply wiring 48A includes a first wiring body 48C and a first reinforcing wiring 48D, and the second power supply wiring 48B includes a second wiring body 48E and a second reinforcing wiring 48F. Therefore, while ensuring efficient routing of the first wiring body 48C and the second wiring body 48E, the first reinforcing wiring 48D and the second reinforcing wiring 48F can be arranged on the connection portion 33. Further, by performing a continuity inspection of the power supply wiring 48, it is possible to collectively inspect for defective formation of the first wiring body 48C and the second wiring body 48E and for defective formation of the first reinforcing wiring 48D and the second reinforcing wiring 48F.

[0101] <Modification Example> In the above-described embodiment, the power supply wiring 48 includes reinforcing wirings (first reinforcing wiring 48D, second reinforcing wiring 48F) as an example of a metal member, but the wiring including a metal member is not limited to this. The wiring including a metal member may be a signal wiring, a ground wiring electrically connected to the metal support layer 2, or a dummy wiring not connected to a terminal.

[0102] In the above-described embodiment, the first power supply wiring 48A includes the first wiring body 48C and the first reinforcing wiring 48D, but the wiring of the present invention is not limited to this.

[0103] As shown in FIG. 4, the first power supply wiring 48A may not include the first reinforcing wiring 48D and may be composed of only the first wiring body 48C. In this case, the first wiring body 48C is routed in a U shape so as to pass over the connection portion 33. The portion of the first wiring body 48C located on the connection portion 33 corresponds to a metal member.

[0104] As shown in FIGS. 4 to 6, the second power supply wiring 48B may not include the second reinforcing wiring 48F and may be composed of only the second wiring body 48E. When the first power supply wiring 48A includes a metal member located on the connection portion 33, the second wiring body 48E may not be routed over the connection portion 33 (see FIGS. 4 and 6), or may be routed over the connection portion 33 (see FIG. 5).

[0105] As shown in FIG. 7, a dummy wiring 55 as an example of a metal member may be disposed on the connection portion 33 instead of the first reinforcing wiring 48D. The dummy wiring 55 is not connected to the first wiring main body 48C and the second wiring main body 48E. Note that the embodiment shown in FIG. 7 is less favorable in terms of forming the pattern of the conductor layer 4 compared to the above-described embodiment. Therefore, the above-described embodiment is more preferable.

[0106] As shown in FIG. 8, the first reinforcing wiring 48D may be connected to the first wiring main body 48C and the second wiring main body 48E. In this case, each of the first wiring main body 48C and the second wiring main body 48E is a circuit that allows conduction or a dummy wiring.

[0107] Also, as shown in FIGS. 9A and 9B, the routing of the wiring including the metal member is not particularly limited as long as it is routed to pass over the connection portion 33.

[0108] As shown in FIG. 9A, the first wiring 51 extends in the longitudinal direction on the first supportless portion 31A toward the other side, then bends in the other width direction and is routed to pass over the connection portion 33, and then bends in the longitudinal direction on the second supportless portion 32A toward one side. The portion of the first wiring 51 located on the connection portion 33 corresponds to the metal member.

[0109] The second wiring 52 is located on the other side of the first wiring 51 in the longitudinal direction. The second wiring 52 extends in the longitudinal direction on the first supportless portion 31A toward one side, then bends in the other width direction and is routed to pass over the connection portion 33, and then bends in the longitudinal direction on the second supportless portion 32A toward the other side. The portion of the second wiring 52 located on the connection portion 33 corresponds to the metal member.

[0110] Also, as shown in FIG. 9B, the third wiring 53 extends on the second non-supporting portion 32A toward the other side in the longitudinal direction, then bends toward one side in the width direction and is routed to pass over the connecting portion 33, and then bends so as to make a U-turn on the second non-supporting portion 32A and extends toward the other side in the longitudinal direction. The portion of the third wiring 53 located on the connecting portion 33 corresponds to a metal member.

[0111] The fourth wiring 54 extends on the second non-supporting portion 32A toward the other side in the longitudinal direction, then extends so as to make a U-turn, then bends toward one side in the width direction and is routed to pass over the connecting portion 33, and bends toward the other side in the longitudinal direction on the first non-supporting portion 31A. The portion of the fourth wiring 54 located on the connecting portion 33 corresponds to a metal member.

[0112] Also, as shown in FIG. 10, in the embodiment of FIG. 9A, the conductor layer 4 may include a dummy wiring 55 in addition to the first wiring 51 and the second wiring 52. The dummy wiring 55 is located between the first wiring 51 and the second wiring 52 on the connecting portion 33.

[0113] Also, as shown in FIG. 11, in the embodiment of FIG. 8, when the first wiring main body 48C and the second wiring main body 48E are dummy wirings, the conductor layer 4 may include the first wiring 51 and the second wiring 52 in addition to the second wiring pattern 41.

[0114] Also, as shown in FIGS. 12A and 12B, the circuit-equipped suspension substrate 1 may further include a second conductor layer 8 and a second cover insulating layer 9 in addition to the metal support layer 2 (see FIG. 2), the base insulating layer 3, the conductor layer 4, and the cover insulating layer 5.

[0115] The second conductor layer 8 is disposed on one side of the cover insulating layer 5 in the thickness direction, specifically, on one surface of the cover insulating layer 5 in the thickness direction. The second conductor layer 8 includes a reinforcing wiring 80 as an example of a metal member.

[0116] The reinforcing wiring 80 extends in the width direction. The reinforcing wiring 80 is arranged so as to overlap the first wiring body 48C, the connecting portion 33, and the second wiring body 48E all together when viewed from the thickness direction.

[0117] The second cover insulating layer 9 is arranged on one side in the thickness direction of the cover insulating layer 5, specifically, on one surface in the thickness direction of the cover insulating layer 5 so as to cover the second conductor layer 8. The second cover insulating layer 9 has a second reinforcing cover 90. The second reinforcing cover 90 is arranged on one surface in the thickness direction of the reinforcing cover 50 so as to cover the reinforcing wiring 80.

[0118] As shown in FIG. 12B, in this modification, the reinforcing portion 10 includes the above-described reinforcing cover 50, the above-described reinforcing wiring 80, and the above-described second reinforcing cover 90. In other words, the reinforcing portion 10 includes the reinforcing cover 50 and the second reinforcing cover 90 as two resin layers laminated in the thickness direction, and the reinforcing wiring 80 as a metal member.

[0119] Also, as shown in FIGS. 13A and 13B, the reinforcing portion 10 may be composed of two or more resin layers laminated in the thickness direction. As shown in FIG. 13B, in this modification, the reinforcing portion 10 is composed of the reinforcing cover 50 and the second reinforcing cover 90. In this modification, the second reinforcing cover 90 is located between the first wiring body 48C and the second wiring body 48E in the width direction.

[0120] Also, although not shown, the reinforcing portion 10 may include the first reinforcing wiring 48D and / or the second reinforcing wiring 48F in addition to the reinforcing cover 50 and the second reinforcing cover 90. In this case, the second reinforcing cover 90 overlaps the first reinforcing wiring 48D and / or the second reinforcing wiring 48F when viewed from the thickness direction.

[0121] Also, as shown in FIG. 14, the dimensions of the second reinforcing cover 90 in the width direction are not particularly limited, and the second reinforcing cover 90 may be arranged so as to collectively overlap the first wiring body 48C, the connecting portion 33, and the second wiring body 48E when viewed from the thickness direction. According to this modification, compared with the embodiments shown in FIGS. 13A and 13B, damage to the reinforcing portion 10 can be suppressed.

[0122] Also, as shown in FIG. 15, the reinforcing portion 10 may include a reinforcing support 29 made of the same metal as the metal support layer 2. The reinforcing support 29 is arranged on the other surface of the connecting portion 33 in the thickness direction.

[0123] Also, in the above-described embodiment, as an example of the wiring circuit board, the suspension board 1 with a circuit is given, but the wiring circuit board is not limited to the suspension board 1 with a circuit. As shown in FIG. 16, the wiring circuit board may be a flexible printed wiring board 100 that does not include the metal support layer 2.

[0124] Even with such a modification, the same operational effects as those of the above-described embodiment can be achieved. Also, the embodiments and modifications can be combined as appropriate.

Description of Reference Numerals

[0125] 1 Suspension board with a circuit 10 Reinforcing portion 3 Base insulating layer 31 First main body base 32 Second main body base 33 Connecting portion 4 Conductor layer 45 Element connection terminal 47 Power supply terminal 48 Power supply wiring 48C First wiring body 48D First reinforcing wiring 48E Second wiring body 48F Second reinforcing wiring

Claims

1. A wiring circuit board extending in a predetermined direction, comprising: an insulating layer; a conductor layer disposed on one side in the thickness direction of the insulating layer, wherein the insulating layer comprises a first portion and a second portion spaced apart from each other in a width direction orthogonal to the longitudinal direction of the wiring circuit board; and a connecting portion connecting a part of the first portion in the longitudinal direction and a part of the second portion in the longitudinal direction; the wiring circuit board is provided with a reinforcing portion disposed on the surface of the connecting portion for reinforcing the connecting portion; the reinforcing portion includes two or more layers laminated in the thickness direction, and the two or more layers include at least one of a resin layer and a metal member. A wiring circuit board characterized by this.

2. The reinforcing portion includes the metal member, wherein the metal member is made of the same metal as the conductor layer. The wiring circuit board according to claim 1.

3. The conductor layer includes wiring, wherein the wiring includes the metal member. The wiring circuit board according to claim 2.

4. The conductor layer includes a first terminal and a second terminal located away from the first terminal in the longitudinal direction, wherein the wiring includes a wiring body connecting the first terminal and the second terminal; and the metal member continuous with the wiring body. The wiring circuit board according to claim 3.

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