Wired circuit board

Abstract

To provide a wiring circuit board capable of suppressing bending of tip portions of terminals.SOLUTION: A suspension board 1 with a circuit includes a first insulating layer 12 and a conductor pattern 13. The conductor pattern 13 has a terminal 131A and a wiring 133A connected to the terminal 131A. The terminal 131A has a width in a first direction and extends in a second direction orthogonal to the first direction. The first insulating layer 12 has a first support portion that supports the wiring 133A and a second support portion 122A that protrudes from an edge E11 of the first support portion in the second direction to the second direction and supports the tip portion of the terminal 131A. In the first direction, both ends of the tip portion of the terminal 131A protrude from the second support portion 122A.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a printed circuit board. [Background technology]

[0002] BACKGROUND ART Conventionally, there is known a wired circuit board in which a terminal is provided with a connection portion having a width narrower than the main body of the terminal, and at least the connection portion protrudes from the base insulating layer (see Patent Document 1 below).

[0003] With this wired circuit board, some of the molten solder on the connection portion flows to the back surface of the connection portion, preventing excess solder from flowing onto the insulating base layer and adhering to adjacent terminals, thereby preventing short circuits between adjacent terminals. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-012386 Summary of the Invention [Problem to be solved by the invention]

[0005] In the wired circuit board described in the above-mentioned Patent Document 1, the connection portions protrude from the base insulating layer, and therefore have the disadvantage that the connection portions are prone to breaking.

[0006] The present invention provides a wired circuit board that can prevent breakage of the tip portions of terminals. [Means for solving the problem]

[0007] The present invention [1] includes a wired circuit board comprising an insulating layer and a conductor pattern disposed on the insulating layer, the conductor pattern having a terminal and a wiring connected to the terminal, the terminal having a width in a first direction and extending in a second direction perpendicular to the first direction, the insulating layer having a first support portion supporting at least the wiring, and a second support portion protruding in the second direction from an edge of the first support portion in the second direction and supporting a tip portion of the terminal, and both ends of the tip portion of the terminal protruding relative to the second support portion in the first direction.

[0008] According to this configuration, the tip end of the terminal can be supported by the second support portion of the insulating layer.

[0009] This can prevent the tip of the terminal from breaking.

[0010] Furthermore, both ends of the tip portion of the terminal protrude relative to the second support portion in the first direction.

[0011] This allows some of the molten solder on the tip of the terminal to flow along both ends of the tip of the terminal to the back side of the terminal.

[0012] As a result, the solidified solder can be prevented from peeling off from the tip of the terminal.

[0013] The present invention [2] includes the wired circuit board according to the above [1], wherein a tip of the second support portion protrudes relative to the tip of the terminal in the second direction.

[0014] With this configuration, it is possible to prevent the molten solder on the tip of the terminal from flowing down the tip to the back side of the terminal.

[0015] As a result, the thickness of the molten solder can be ensured at the tip of the terminal.

[0016] The present invention [3] includes the wired circuit board of [1] or [2] above, wherein the terminal has a main body portion having the first end portion and connected to the wiring, and a protrusion having the tip portion and extending from the main body portion in the second direction, and the protrusion has a width narrower than that of the main body portion in the first direction.

[0017] With this configuration, when a plurality of terminals are arranged adjacent to each other, a space can be secured between the protruding portions of the adjacent terminals.

[0018] As a result, even if the space between the main body portions of adjacent terminals becomes narrower due to fan pitch, short circuits between adjacent terminals can be prevented by placing solder on the protrusions.

[0019] The present invention [4] includes the wired circuit board of any one of [1] to [3] above, wherein the edge of the first support portion of the insulating layer is positioned between the main body portion of the terminal and the tip portion of the terminal in the second direction.

[0020] With this configuration, the main body of the terminal can be reliably supported by the first support portion of the insulating layer.

[0021] The present invention [5] includes the wired circuit board according to any one of the above [1] to [4], wherein the second support portion is thinner than the first support portion.

[0022] According to this configuration, the first support portion can prevent the tip portion of the terminal from breaking, and flexibility of the terminal can be ensured when the terminal is connected to an electronic component.

[0023] Therefore, breakage of the tip of the terminal can be suppressed, and the mountability of the electronic component can be ensured.

[0024] The present invention [6] includes the wired circuit board according to any one of the above [1] to [5], wherein a tip of the second support part in the second direction is a free end part.

[0025] According to this configuration, flexibility of the terminals can be further ensured when connecting the terminals to the electronic component, and the mountability of the electronic component can be further ensured. [Effects of the Invention]

[0026] According to the wired circuit board of the present invention, breakage of the tip portions of the terminals can be suppressed. [Brief explanation of the drawings]

[0027] [Figure 1] FIG. 1 is a plan view of a suspension board with circuit. [Figure 2] Fig. 2A is an enlarged view of the terminal shown in Fig. 1. Fig. 2B is a cross-sectional view taken along line AA of the suspension board with circuit shown in Fig. 2A. Fig. 2C is a cross-sectional view taken along line BB of the suspension board with circuit shown in Fig. 2A. [Figure 3] FIG. 3 is an explanatory diagram illustrating the first modified example. [Figure 4] FIG. 4 is an explanatory diagram illustrating the second modified example. [Figure 5] FIG. 5 is an explanatory diagram illustrating the third modified example. [Figure 6] FIG. 6 is an explanatory diagram illustrating the fourth modified example. [Figure 7] Fig. 7A is an explanatory diagram illustrating a fifth modified example, and is a plan view of a flexible wired circuit board, and Fig. 7B is a CC cross-sectional view of the flexible wired circuit board shown in Fig. 7A. DETAILED DESCRIPTION OF THE INVENTION

[0028] 1. Circuit-attached suspension board A suspension board with circuit 1 will be described as an example of a wired circuit board with reference to FIGS. 1 to 2B.

[0029] The suspension board with circuit 1 is one component that constitutes the head gimbal assembly of a hard disk drive. The suspension board with circuit 1 can mount a slider S equipped with a magnetic head (see Figure 2B). The magnetic head is an electronic element for reading data from and writing data to the recording surface of a hard disk. The suspension board with circuit 1 supports the slider S and electrically connects the magnetic head to a control board of the hard disk drive.

[0030] As shown in FIG. 1, the suspension board with circuit 1 includes a slider mounting portion 2 and a wiring portion 3.

[0031] The slider mounting portion 2 can mount the slider S. The slider mounting portion 2 may have a pedestal 21 for supporting the slider S. The number, arrangement, and shape of the pedestal 21 are not limited. The slider mounting portion 2 is located at one end of the suspension board with circuit 1. In this embodiment, the slider mounting portion 2 has a generally rectangular shape in a plan view. The shape of the slider mounting portion 2 is not limited. As shown in FIG. 2B , in this embodiment, the slider S extends in the second direction. A plurality of terminals S1 electrically connected to the magnetic head are disposed at one end of the slider S in the second direction. When the slider S is mounted on the slider mounting portion 2, each of the plurality of terminals S1 of the slider S extends in the thickness direction of the suspension board with circuit 1. In other words, when the slider S is mounted on the slider mounting portion 2, each of the terminals S1 of the slider S extends in a direction intersecting with the terminal 131A. The terminals 131A will be described later. When the slider S is mounted on the slider mounting portion 2, the terminals S1 of the slider S are aligned in the first direction.

[0032] 1, a conductor pattern 13, which will be described later, is formed on the wiring portion 3. The wiring portion 3 includes an outrigger portion 3A and a cable portion 3B.

[0033] The outrigger portion 3A is disposed around the slider mounting portion 2 so as to surround the slider mounting portion 2. In this embodiment, the outrigger portion 3A has a substantially rectangular frame shape in a plan view. The shape of the outrigger portion 3A is not limited. One end of the slider mounting portion 2 is continuous with the inner peripheral edge of the outrigger portion 3A. In this embodiment, the suspension board with circuit 1 has an opening 4 at the connection portion between the slider mounting portion 2 and the outrigger portion 3A. The opening 4 extends in a first direction. The first direction is perpendicular to the thickness direction of the suspension board with circuit 1.

[0034] The cable portion 3B extends from the outer peripheral edge of the outrigger portion 3A.

[0035] As shown in FIG. 2B, the suspension board with circuit 1 includes a metal supporting board 11, a first insulating layer 12 as an example of an insulating layer, a conductive pattern 13, and a second insulating layer .

[0036] (1) Metal supporting substrate The metal supporting board 11 supports the first insulating layer 12, the conductor pattern 13, and the second insulating layer 14. The metal supporting board 11 is provided in the slider mounting portion 2 and the wiring portion 3. Examples of materials for the metal supporting board 11 include stainless steel and copper alloys.

[0037] (2) First insulating layer The first insulating layer 12 is disposed on the metal supporting board 11 in the thickness direction of the suspension board with circuit 1. The first insulating layer 12 is disposed between the metal supporting board 11 and the conductive pattern 13. The first insulating layer 12 insulates the metal supporting board 11 from the conductive pattern 13. Therefore, as shown in FIG. 1 , the first insulating layer 12 is provided in a portion where the conductive pattern 13 is formed. In this embodiment, the first insulating layer 12 is provided in the wiring portion 3.

[0038] The first insulating layer 12 is made of a resin, such as polyimide, maleimide, epoxy resin, polybenzoxazole, or polyester.

[0039] (3) Conductor pattern As shown in FIG. 2B, the conductive pattern 13 is disposed on the first insulating layer 12 in the thickness direction. The conductive pattern 13 is made of a metal. Examples of metals include copper, silver, gold, iron, aluminum, chromium, and alloys thereof. From the viewpoint of obtaining good electrical properties, copper is preferable. The shape of the conductive pattern 13 is not limited.

[0040] As shown in FIG. 1, the conductive pattern 13 has a plurality of terminals 131A, 131B, 131C, and 131D, a plurality of terminals 132A, 132B, 132C, and 132D, and a plurality of wirings 133A, 133B, 133C, and 133D.

[0041] (3-1) Terminals 131A, 131B, 131C, 131D 1, the terminals 131A, 131B, 131C, and 131D are arranged on the edge of the opening 4. The terminals 131A, 131B, 131C, and 131D are aligned in the first direction at intervals from one another. When the slider S is mounted on the suspension board with circuit 1, the terminals 131A, 131B, 131C, and 131D are connected to the magnetic head of the slider S.

[0042] 2A, the terminal 131A has a width in a first direction and extends in a second direction. The second direction is perpendicular to the thickness direction of the suspension board with circuit 1 and the first direction. The terminal 131A has a tip portion E1 in the second direction. The terminal 131A has a main body portion 1311 and a protrusion portion 1312.

[0043] The main body 1311 is connected to the wiring 133 A. The main body 1311 has a generally rectangular shape in plan view.

[0044] The protrusion 1312 has a tip E1. The protrusion 1312 extends from the main body 1311 in the second direction. The protrusion 1312 extends in the second direction from the main body 1311 toward the slider mounting portion 2. When the slider S is mounted on the slider mounting portion 2, the protrusion 1312 extends in the second direction from the main body 1311 toward the terminal S1 (see FIG. 2B) of the slider S. The protrusion 1312 has a narrower width in the first direction than the main body 1311. The protrusion 1312 has a generally rectangular shape in a plan view.

[0045] The terminals 131B, 131C, and 131D have the same structure as the terminal 131A, so a description of the terminals 131B, 131C, and 131D will be omitted.

[0046] (3-2) Terminals 132A, 132B, 132C, 132D 1, in this embodiment, the terminals 132A, 132B, 132C, and 132D are arranged at the other end of the suspension board with circuit 1. The terminals 132A, 132B, 132C, and 132D are arranged at the end of the cable portion 3B. The terminals 132A, 132B, 132C, and 132D are electrically connected to a control board of a hard disk drive.

[0047] (3-3) Wiring The wiring 133A electrically connects the terminal 131A and the terminal 132A. One end of the wiring 133A is connected to the main body 1311 of the terminal 131A. The other end of the wiring 133A is connected to the terminal 132A.

[0048] The wiring 133B electrically connects the terminal 131B and the terminal 132B. One end of the wiring 133B is connected to the main body 1311 of the terminal 131B. The other end of the wiring 133B is connected to the terminal 132B.

[0049] The wiring 133C electrically connects the terminal 131C and the terminal 132C. One end of the wiring 133C is connected to the main body 1311 of the terminal 131C. The other end of the wiring 133B is connected to the terminal 132C.

[0050] The wiring 133D electrically connects the terminal 131D and the terminal 132D. One end of the wiring 133D is connected to the main body 1311 of the terminal 131D. The other end of the wiring 133D is connected to the terminal 132D.

[0051] (4) Second insulating layer 2B, second insulating layer 14 covers wiring 133A. Second insulating layer 14 is disposed on first insulating layer 12 in the thickness direction. Second insulating layer 14 does not cover terminal 131A.

[0052] Although not shown, the second insulating layer 14 also covers the wirings 133B, 133C, and 133D. The second insulating layer 14 does not cover the terminals 131B, 131C, and 131D and the terminals 132A, 132B, 132C, and 132D.

[0053] The second insulating layer 14 is made of a resin, such as polyimide, maleimide, epoxy resin, polybenzoxazole, and polyester.

[0054] 2. Details of the first insulating layer Next, the first insulating layer 12 will be described in detail with reference to FIGS. 2A to 2C.

[0055] As shown in FIG. 2A, the first insulating layer 12 has a first support portion 121 and a plurality of second support portions 122A, 122B, 122C, and 122D.

[0056] (1) First support part The first support portion 121 is the entire first insulating layer 12 excluding the second support portions 122A, 122B, 122C, and 122D. The first support portion 121 supports a portion of each of the terminals 131A, 131B, 131C, and 131D, the terminals 132A, 132B, 132C, and 132D, and the wirings 133A, 133B, 133C, and 133D. In this embodiment, the edge E11 of the first support portion 121 of the first insulating layer 12 is disposed between the main body portion 1311 of each of the terminals 131A, 131B, 131C, and 131D and the tip portion E1 of each of the terminals 131A, 131B, 131C, and 131D in the second direction. As a result, the first support portion 121 supports the main body portion 1311 and a part of the protrusion portion 1312 of each of the terminals 131A, 131B, 131C, and 131D. The edge E11 is located on the edge of the opening 4. The edge E11 extends in the first direction.

[0057] (2)Second support part As shown in FIGS. 1 and 2A, each of the second supports 122A, 122B, 122C, and 122D protrudes in the second direction from an edge E11 (see FIG. 1) of the first support 121 in the second direction. Each of the second supports 122A, 122B, 122C, and 122D protrudes toward the inside of the opening 4. The second supports 122A, 122B, 122C, and 122D are aligned in the first direction at intervals from one another. The second support 122A supports the tip E1 of the terminal 131A. The second support 122B supports the tip of the terminal 131B. The second support 122C supports the tip of the terminal 131C. The second support 122D supports the tip of the terminal 131D.

[0058] As shown in FIG. 2B , the tip E2 of the second support portion 122A protrudes relative to the tip E1 of the terminal 131A in the second direction. This prevents the molten solder B on the tip E1 of the terminal 131A from flowing along the tip E1 to the back side of the terminal 131A. As a result, the thickness of the molten solder B can be ensured at the tip E1 of the terminal 131A. This allows the molten solder B on the tip E1 of the terminal 131A to easily come into contact with the terminal S1 of the slider S, even if the terminal S1 of the slider S extends in a direction intersecting the terminal 131A (specifically, in the thickness direction). Note that the tip E2 of the second support portion 122A in the second direction is a free end portion. The second support portion 122A is thinner than the first support portion 121. Note that the edge E11 of the first support portion 121 is flush with the inner surface of the metal supporting board 11 at the opening 4.

[0059] 2C, the second support portion 122A has a width narrower than the protruding portion 1312 in the first direction. Both ends of the protruding portion 1312 protrude relative to the second support portion 122A in the first direction. That is, both ends of the tip portion E1 of the terminal 131A protrude relative to the second support portion 122A in the first direction. This allows a portion of the molten solder B on the tip portion E1 of the terminal 131A to flow along both ends of the protruding portion 1312 to the back side of the terminal 131A. As a result, it is possible to prevent the solidified solder from peeling off the tip portion E1 of the terminal 131A.

[0060] In this embodiment, one end surface of second support portion 122A in the first direction is covered by one end surface of protrusion portion 1312 in the first direction. The other end surface of second support portion 122A in the first direction is covered by the other end surface of protrusion portion 1312 in the first direction. This makes it possible to prevent second support portion 122A from peeling off from protrusion portion 1312.

[0061] The second support portions 122B, 122C, and 122D have the same structure as the second support portion 122A, so a description of the second support portions 122B, 122C, and 122D will be omitted.

[0062] 3. Effects (1) According to the suspension board with circuit 1, the second support portion 122A of the first insulating layer 12 can support the tip portion E1 of the terminal 131A, as shown in FIG. 2B.

[0063] This can prevent the tip portion E1 of the terminal 131A from breaking.

[0064] Furthermore, as shown in FIG. 2C, both ends of the tip portion E1 of the terminal 131A protrude from the second support portion 122A in the first direction.

[0065] This allows a portion of the molten solder on the tip portion E1 of the terminal 131A to flow along both ends of the tip portion E1 of the terminal 131A to the back side of the terminal 131A.

[0066] As a result, the solidified solder can be prevented from peeling off from the tip end E1 of the terminal 131A.

[0067] (2) According to the suspension board with circuit 1, as shown in FIG. 2B, the tip of the second support portion 122A protrudes in the second direction relative to the tip portion E1 of the terminal 131A.

[0068] Therefore, it is possible to prevent the molten solder B on the tip portion E1 of the terminal 131A from flowing along the tip portion E1 to the back side of the terminal 131A.

[0069] As a result, the thickness of the molten solder can be ensured at the tip E1 of the terminal 131A.

[0070] This allows the molten solder B on the tip E1 of the terminal 131A to easily come into contact with the terminal S1 of the slider S, even if the terminal S1 of the slider S mounted on the slider mounting portion 2 extends in a direction intersecting the terminal 131A.

[0071] (3) According to the suspension board with circuit 1, as shown in FIG. 2A, the protrusion 1312 having the tip end E1 has a width narrower than that of the main body 1311 in the first direction.

[0072] Therefore, when a plurality of terminals 131A and 131B are arranged adjacent to each other, a space can be secured between the protruding portions 1312 of the adjacent terminals 131A and 131B.

[0073] As a result, even if the space between the main bodies 1311 of the adjacent terminals 131A, 131B becomes narrow due to the fan pitch, by placing solder on the protrusions 1312, it is possible to prevent short circuits between the adjacent terminals 131A, 131B.

[0074] (4) According to the suspension board with circuit 1, as shown in FIG. 2A, the edge E11 of the first support portion 121 is disposed between the main body portion 1311 of the terminal 131A and the tip portion E1 of the terminal 131A in the second direction.

[0075] Therefore, the main body 1311 of the terminal 131A can be reliably supported by the first support portion 121.

[0076] (5) According to the suspension board with circuit 1, the second support portion 122A is thinner than the first support portion 121, as shown in FIG. 2B.

[0077] Therefore, the first support portion 121 can prevent the tip portion E1 of the terminal 131A from breaking, and flexibility of the terminal 131A when connecting the terminal 131A to the slider S can be ensured.

[0078] As a result, the mountability of the slider S can be ensured while preventing the tip portion E1 of the terminal 131A from breaking.

[0079] (6) According to the suspension board with circuit 1, as shown in FIG. 2B, the tip E2 of the second support portion 122A in the second direction is a free end portion.

[0080] Therefore, flexibility of the terminals 131A when connecting the terminals 131A to the slider S can be further ensured, and mountability of the slider S can be further ensured.

[0081] 4. Variations Next, a modified example will be described. In the modified example, the same components as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof will be omitted. (1) As shown in FIG. 3, the protrusion 1312 may have the same width as the main body 1311. (2) As shown in Fig. 4, the tip E2 of the second support portion 122A does not have to protrude beyond the tip E1 of the terminal 131A. The tip E2 of the second support portion 122A may coincide with the tip E1 of the terminal 131A. (4) As shown in FIG. 5, the second support portion 122A may have the same thickness as the first support portion 121. (5) As shown in Fig. 6, one end of second support portion 122A in the first direction does not have to be covered by one end of terminal 131A in the first direction. The other end of second support portion 122A in the first direction does not have to be covered by the other end of terminal 131A in the first direction. (6) As shown in Figures 7A and 7B, the wired circuit board may be a flexible wired circuit board 100. In this case, the edge E11 of the first support portion 121 may be located at one edge of the flexible wired circuit board 100. The second support portions 122A, 122B, 122C, and 122D protrude from the edge E11 toward one side (outside) of the flexible wired circuit board 100. (7) In the modified examples (1) to (6), the same effects as those of the above-described embodiment can be obtained. [Explanation of symbols]

[0082] 1. Circuit-equipped suspension board 12 First insulating layer 13 Conductor pattern 121 1st support part 122A 2nd support part 131A terminal 133A wiring 1311 Main body 1312 Protrusion E1 tip E2 tip E11 Edge 100 Flexible printed circuit board

Claims

1. an insulating layer; a conductor pattern disposed on the insulating layer; Equipped with The conductor pattern is The terminal and Wiring connected to the terminal; and The terminal has a width in a first direction and extends in a second direction perpendicular to the first direction, The insulating layer is a first support portion that supports at least the wiring; a second support portion that protrudes in the second direction from an edge of the first support portion in the second direction and supports a tip portion of the terminal; and In the first direction, both ends of the tip portion of the terminal protrude relative to the second support portion.

2. The wired circuit board according to claim 1 , wherein a tip of the second support portion protrudes beyond the tip of the terminal in the second direction.

3. The terminal is a main body portion connected to the wiring; a protrusion having the tip portion and extending from the main body portion in the second direction, The printed circuit board according to claim 1 , wherein the protrusion has a width narrower than that of the main body in the first direction.

4. The wired circuit board according to claim 3 , wherein the edge of the first support portion of the insulating layer is disposed between the main body portion of the terminal and the tip portion of the terminal in the second direction.

5. The printed circuit board according to claim 1 , wherein the second support portion is thinner than the first support portion.

6. The wired circuit board according to claim 1 , wherein a tip of the second support portion in the second direction is a free end portion.

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