Patent Publication Number: US-2023156914-A1

Title: Wiring circuit board

Description:
TECHNICAL FIELD 
     The present invention relates to a wiring circuit board. 
     BACKGROUND ART 
     The wiring circuit board is used for various industrial products such as electronic and electrical devices. As such a wiring circuit board, for example, a suspension board with circuit on which a slider including a magnetic head, and a piezoelectric element for displacing the slider are mounted has been known. 
     For example, a suspension board with circuit including a support board, a base insulating layer, and a conductive pattern in order in a thickness direction of the support board, and in which the conductive pattern includes a magnetic head terminal electrically connected to a magnetic head, a signal wiring connected to the magnetic head terminal, a first terminal electrically connected to a piezoelectric element, and a power supply wiring connected to the first terminal; and the signal wiring and the power supply wiring are adjacent to each other has been proposed (ref: for example, Patent Document 1). 
     CITATION LIST 
     Patent Document 
     
         
         Patent Document 1: Japanese Unexamined Patent Publication No. 2018-41520 
       
    
     SUMMARY OF THE INVENTION 
     Problem to be Solved by the Invention 
     However, in the suspension board with circuit described in Patent Document 1, there is a case where the power supply wiring which is electrically connected to the piezoelectric element is charged, and the power supply wiring and the signal wiring are short-circuited. 
     The present invention provides a wiring circuit board which is capable of suppressing a short circuit between a first wiring and a second wiring. 
     Means for Solving the Problem 
     The present invention [1] includes a wiring circuit board including a first mounting region for mounting a first electronic element and a second mounting region for mounting a second electronic element, the wiring circuit board including a metal support layer, a base insulating layer disposed at one side in a thickness direction of the metal support layer, and a conductive layer disposed at one side in the thickness direction of the base insulating layer, wherein the conductive layer includes a first wiring pattern having a first terminal disposed inside or adjacent to the first mounting region, and a first wiring connected to the first terminal; a second wiring pattern having a second terminal disposed inside or adjacent to the second mounting region, and a second wiring connected to the second terminal and disposed at spaced intervals to the first wiring; and a shield wiring pattern electrically connected to the metal support layer, and the shield wiring pattern includes a shield wiring disposed between the first wiring and the second wiring. 
     According to such a configuration, the shield wiring pattern is electrically connected to the metal support layer, and the shield wiring provided in the shield wiring pattern is disposed between the first wiring and the second wiring. Therefore, even when the first wiring and/or the second wiring are/is charged, it is possible to suppress a short circuit between the first wiring and the second wiring. 
     The present invention [2] includes the wiring circuit board described in the above-described [1], wherein the shield wiring pattern has an inspection terminal for continuity inspection, and a ground connecting portion electrically connected to the metal support layer. 
     However, when the shield wiring pattern is provided in the wiring circuit board, it is desirable that the continuity inspection is carried out in order to inspect a formation failure of the shield wiring pattern. 
     According to the above-described configuration, the shield wiring pattern has the inspection terminal and the ground connecting portion. Therefore, it is possible to bring a probe into contact with the inspection terminal, and carry out the continuity inspection of the shield wiring pattern. 
     The present invention [3] includes the wiring circuit board described in the above-described [2], wherein at least one of the inspection terminal and the ground connecting portion is located in an end portion of the shield wiring. 
     According to such a configuration, since at least one of the inspection terminal and the ground connecting portion is located in the end portion of the shield wiring, it is possible to further more surely inspect the formation failure of the shield wiring pattern by the continuity inspection of the shield wiring pattern. 
     The present invention [4] includes the wiring circuit board described in the above-described [2] or [3] further including a cover insulating layer disposed at one side in the thickness direction of the base insulating layer and covering the conductive layer, wherein the first terminal, the second terminal, and the inspection terminal are exposed from the cover insulating layer. 
     According to such a configuration, since the first terminal, the second terminal, and the inspection terminal are exposed from the cover insulating layer, it is possible to bring the probe into contact with each of the first terminal, the second terminal, and the inspection terminal from one side in the thickness direction. Therefore, it is possible to collectively carry out the continuity inspection of the first wiring pattern, the second wiring pattern, and the shield wiring pattern. 
     Effect of the Invention 
     According to the wiring circuit board of the present invention, it is possible to suppress a short circuit between a first wiring and a second wiring. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    shows a plan view of a suspension board with circuit as a first embodiment of a wiring circuit board of the present invention. 
         FIG.  2    shows an A-A cross-sectional view of the suspension board with circuit shown in  FIG.  1   . 
         FIG.  3 A  shows a B-B cross-sectional view of the suspension board with circuit shown in  FIG.  1   . 
         FIG.  3 B  shows a C-C cross-sectional view of the suspension board with circuit shown in  FIG.  1   . 
         FIG.  3 C  shows a D-D cross-sectional view of the suspension board with circuit shown in  FIG.  1   . 
         FIG.  4    shows a D-D cross-sectional view of the suspension board with circuit as a second embodiment. 
         FIG.  5    shows a D-D cross-sectional view of the suspension board with circuit as a third embodiment. 
         FIG.  6    shows a D-D cross-sectional view of the suspension board with circuit as a fourth embodiment. 
         FIG.  7    shows a D-D cross-sectional view of the suspension board with circuit as a fifth embodiment. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     A suspension board with circuit  1  as a first embodiment of a wiring circuit board of the present invention is described with reference to  FIGS.  1  to  3 C . 
     As shown in  FIG.  1   , the suspension board with circuit  1  has a generally flat belt shape extending in a predetermined direction. 
     In  FIG.  1   , a thickness direction on the plane of the sheet is a thickness direction (first direction) of the suspension board with circuit  1 , a near side on the plane of the sheet is one side in the thickness direction (one side in the first direction), and a depth side on the plane of the sheet is the other side in the thickness direction (the other side in the first direction). 
     In  FIG.  1   , an up-down direction on the plane of the sheet is a longitudinal direction (second direction perpendicular to the first direction) of the suspension board with circuit  1 , an upper side on the plane of the sheet is one side in the longitudinal direction (one side in the second direction), and a lower side on the plane of the sheet is the other side in the longitudinal direction (the other side in the second direction). 
     In  FIG.  1   , a right-left direction on the plane of the sheet is a width direction (third direction perpendicular to the first direction and the second direction) of the suspension board with circuit  1 , a right side on the plane of the sheet is one side in the width direction (one side in the third direction), and a left side on the plane of the sheet is the other side in the width direction (the other side in the third direction). Specifically, directions are in conformity with direction arrows described in each view. 
     Further, in the following, the thickness direction of the suspension board with circuit  1  is simply referred to as the thickness direction, the longitudinal direction thereof is simply referred to as the longitudinal direction, and the width direction thereof is simply referred to as the width direction unless otherwise specified. 
     The suspension board with circuit  1  is capable of mounting a slider  6  as one example of a first electronic element and a plurality of (two) piezoelectric elements  7  as one example of a second electronic element. The suspension board with circuit  1  includes a first mounting region  1 A and a plurality of (two) second mounting regions  1 B. 
     The first mounting region  1 A is a region for mounting the slider  6 . The first mounting region  1 A is located in one end portion of the suspension board with circuit  1  in the longitudinal direction. The first mounting region  1 A is located between the plurality of (two) second mounting regions  1 B in the width direction. 
     The plurality of (two) second mounting regions  1 B are regions for mounting the piezoelectric element  7 . The plurality of (two) second mounting regions  1 B are located at the other side with respect to the first mounting region  1 A in the longitudinal direction. The plurality of (two) second mounting regions  1 B are located at spaced intervals to each other in the width direction. 
     As shown in  FIG.  2   , the suspension board with circuit  1  includes a metal support layer  2 , a base insulating layer  3 , a conductive layer  4 , and a cover insulating layer  5  in order from the other side toward one side in the thickness direction. 
     1-1. Metal Support Layer 
     As shown in  FIG.  1   , the metal support layer  2  is a metal support for supporting the conductive layer  4 , and extends in the longitudinal direction. In  FIG.  1   , for convenience, the metal support layer  2  and the conductive layer  4  are shown by a solid line, and the base insulating layer  3  and the cover insulating layer  5  are omitted. 
     The metal support layer  2  includes a stage  20  and a main body portion  21 . 
     The stage  20  is located in one end portion of the metal support layer  2  in the longitudinal direction. The stage  20  is overlapped with the first mounting region  1 A and the plurality of (two) second mounting regions  1 B when viewed from the thickness direction. The stage  20  has an H-shape when viewed from the thickness direction. The stage  20  has two recessed portions  20 A. The two recessed portions  20 A are disposed at spaced intervals to each other in the width direction. The recessed portion  20 A is overlapped with the second mounting region  1 B when viewed from the thickness direction. The recessed portion  20 A is recessed inwardly in the width direction from the end edge of the stage  20  in the width direction. 
     The main body portion  21  is a portion which is supported by a load beam (not shown). The main body portion  21  is located at the other side with respect to the stage  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 stage  20  in the longitudinal direction. 
     Examples of a material for the metal support layer  2  include metal materials such as stainless steel. A thickness of the metal support layer  2  is not particularly limited, and is, for example, 10 μm or more and 35 μm or less. 
     1-2. Base Insulating Layer 
     As shown in  FIG.  2   , the base insulating layer  3  is disposed at one side of the metal support layer  2  in the thickness direction, specifically, on one surface in the thickness direction of the metal support layer  2 . The base insulating layer  3  has a predetermined pattern corresponding to the conductive layer  4 . The base insulating layer  3  is located between the metal support layer  2  and the conductive layer  4  in the thickness direction. 
     As shown in  FIG.  3 C , the base insulating layer  3  includes a ground opening  30 . The ground opening  30  is located in a portion located above the main body portion  21  in the base insulating layer  3 . The ground opening  30  penetrates the base insulating layer  3  in the thickness direction. The ground opening  30  exposes one surface in the thickness direction of the main body portion  21  from the base insulating layer  3 . 
     Examples of a material for the base insulating layer  3  include synthetic resins such as polyimide resin. 
     A thickness of the base insulating layer  3  is not particularly limited, and is, for example, 1 μm or more and 1000 μm or less. 
     1-3. Conductive Layer 
     As shown in  FIG.  2   , the conductive layer  4  is disposed at one side of the base insulating layer  3  in the thickness direction, specifically, on one surface in the thickness direction of the base insulating layer  3 . 
     As shown in  FIG.  1   , the conductive layer  4  includes a first wiring pattern  40 , a second wiring pattern  41 , and a shield wiring pattern  42 . 
     The first wiring pattern  40  includes a plurality of (four) slider connection terminals  40 A as one example of a first terminal, a plurality of (four) external connection terminals  40 B, and a plurality of (four) signal wirings  40 C. 
     The plurality of (four) slider connection terminals  40 A are electrically connected to the slider  6  via a bonding material (for example, solder etc.) when the slider  6  is mounted on the suspension board with circuit  1 . 
     The plurality of slider connection terminals  40 A are located in one end portion of the suspension board with circuit  1  in the longitudinal direction. In the present embodiment, the plurality of slider connection terminals  40 A are disposed adjacent to the first mounting region  1 A. More specifically, the plurality of slider connection terminals  40 A are disposed adjacent to one side with respect to the first mounting region  1 A in the longitudinal direction. The plurality of slider connection terminals  40 A may be disposed inside the first mounting region  1 A. 
     The plurality of slider connection terminals  40 A are located at spaced intervals to each other in the width direction. The slider connection terminal  40 A has a rectangular shape extending in the longitudinal direction. 
     The plurality of (four) external connection terminals  40 B are electrically connected to an external board  8  in a state where the main body portion  21  is supported by a load beam (not shown). 
     The plurality of (four) external connection terminals  40 B are located in the other end portion of the suspension board with circuit  1  in the longitudinal direction. The plurality of external connection terminals  40 B are located at spaced intervals to each other in the width direction. The external connection terminal  40 B has a rectangular shape extending in the longitudinal direction. 
     Th plurality of (four) signal wirings  40 C electrically connect the plurality of (four) slider connection terminals  40 A to the plurality of (four) external connection terminals  40 B. The plurality of (four) signal wirings  40 C extend along the longitudinal direction, and are located at spaced intervals to each other in the width direction. The plurality of (four) signal wirings  40 C pass between the two second mounting regions  1 B in the width direction. The plurality of (four) signal wirings  40 C include a plurality of (two) read wirings  40 D as one example of a first wiring, and a plurality of (two) write wirings  40 E. 
     The plurality of (two) read wirings  40 D are connected to the plurality of (two) slider connection terminals  40 A located at one side in the width direction among the plurality of (four) slider connection terminals  40 A. Further, the plurality of (two) read wirings  40 D are connected to the plurality of (two) external connection terminals  40 B located at one side in the width direction among the plurality of (four) external connection terminals  40 B. 
     The plurality of (two) read wirings  40 D are located at one side in the width direction with respect to the plurality of (two) write wirings  40 E. The two read wirings  40 D constitute a first differential signal wiring pair transmitting a read signal. A first read signal is transmitted to one read wiring  40 D, and a second read signal having an opposite phase to the first read signal is transmitted to the other read wiring  40 D among the two read wirings  40 D in a state where the slider connection terminal  40 A is electrically connected to the slider  6 , and the external connection terminal  40 B is electrically connected to the external board  8 . 
     The plurality of (two) write wirings  40 E are connected to the plurality of (two) slider connection terminals  40 A located at the other side in the width direction among the plurality of (four) slider connection terminals  40 A. Further, the plurality of (two) write wirings  40 E are connected to the plurality of (two) external connection terminals  40 B located at the other side in the width direction among the plurality of (four) external connection terminals  40 B. 
     The two write wirings  40 E constitute a second differential signal wiring pair transmitting a write signal. A first write signal is transmitted to one write wiring  40 E, and a second write signal having an opposite phase to the first write signal is transmitted to the other write wiring  40 E among the two write wirings  40 E in a state where the slider connection terminal  40 A is electrically connected to the slider  6 , and the external connection terminal  40 B is electrically connected to the external board  8 . 
     The second wiring pattern  41  includes a plurality of (four) element connection terminals  41 A, a plurality of (two) power supply terminals  41 B, a plurality of (two) power supply wirings  41 C as one example of a second wiring, and a plurality of (two) ground wirings  41 D. 
     The plurality of (four) element connection terminals  41 A are electrically connected to the piezoelectric element  7  when the plurality of (two) piezoelectric elements  7  are mounted on the suspension board with circuit  1  via a bonding material (for example, solder etc.). The element connection terminal  41 A has a rectangular shape extending in the width direction. The two element connection terminals  41 A are disposed in each of the second mounting regions  1 B. 
     The two element connection terminals  41 A disposed in each of the second mounting regions  1 B consist of a first element connection terminal  41 E as one example of a second terminal, and a second element connection terminal  41 F. In other words, the first element connection terminal  41 E and the second element connection terminal  41 F are disposed inside the second mounting region  1 B. The first element connection terminal  41 E and the second element connection terminal  41 F may be also disposed adjacent to the second mounting region  1 B. 
     The first element connection terminal  41 E is located at the other side with respect to the recessed portion  20 A in the longitudinal direction. The second element connection terminal  41 F is located at spaced intervals to the first element connection terminal  41 E in the longitudinal direction. The second element connection terminal  41 F is located at the opposite side to the first element connection terminal  41 E with respect to the recessed portion  20 A. 
     The plurality of (two) power supply terminals  41 B are electrically connected to an external power supply  9  in a state where the main body portion  21  is supported by a load beam (not shown). 
     The plurality of (two) power supply terminals  41 B are located in the other end portion of the suspension board with circuit  1  in the longitudinal direction. The plurality of (two) power supply terminals  41 B are located at spaced intervals to each other in the width direction. The plurality of (four) external connection terminals  40 B are located between the plurality of (two) power supply terminals  41 B in the width direction. The power supply terminal  41 B has a rectangular shape extending in the longitudinal direction. 
     The power supply wiring  41 C is connected to the first element connection terminal  41 E and the power supply terminal  41 B, and electrically connects them. The plurality of (two) power supply wirings  41 C extend along the longitudinal direction, and are located at spaced intervals to each other in the width direction. The plurality of (four) signal wirings  40 C pass between the two power supply wirings  41 C in the width direction. Of the two power supply wirings  41 C, the power supply wiring  41 C at one side in the width direction is disposed at one side at spaced intervals to the read wiring  40 D in the width direction. Of the two power supply wirings  41 C, the power supply wiring  41 C at the other side in the width direction is disposed at the other side at spaced intervals to the write wiring  40 E in the width direction. 
     The ground wiring  41 D is connected to the second element connection terminal  41 F, and electrically connects the second element connection terminal  41 F to the stage  20  (grounded). The plurality of (two) ground wirings  41 D are located at spaced intervals to each other in the width direction. The ground wiring  41 D extends from the second element connection terminal  41 F toward one side in the longitudinal direction. The ground wiring  41 D is in contact with the stage  20  via a hole, which is not shown, provided in the base insulating layer  3  (grounded). 
     The shield wiring pattern  42  is overlapped with the main body portion  21  when viewed from the thickness direction. The shield wiring pattern  42  is located between the power supply wiring  41 C and the read wiring  40 D. The shield wiring pattern  42  includes an inspection terminal  42 A and a shield wiring  42 B. 
     The inspection terminal  42 A is provided for continuity inspection of the shield wiring pattern  42 . A third probe  12  is brought into contact with the inspection terminal  42 A when the continuity inspection of the shield wiring pattern  42  is carried out (ref:  FIG.  3 C ). The inspection terminal  42 A is located in one end portion of the shield wiring pattern  42  in the longitudinal direction. The inspection terminal  42 A is located in one end portion of the main body portion  21  in the longitudinal direction. The inspection terminal  42 A is located on one surface in the thickness direction of the base insulating layer  3 . The inspection terminal  42 A has a rectangular shape extending in the longitudinal direction. 
     The shield wiring  42 B is connected to the inspection terminal  42 A, and electrically connects the inspection terminal  42 A to the main body portion  21  (grounded). Thus, the shield wiring pattern  42  is electrically connected to the metal support layer  2 . 
     The shield wiring  42 B suppresses a short circuit between the power supply wiring  41 C and the read wiring  40 D. The shield wiring  42 B extends along the longitudinal direction. The shield wiring  42 B is disposed between the power supply wiring  41 C and the read wiring  40 D. The shield wiring  42 B is adjacent to the power supply wiring  41 C and the read wiring  40 D. 
     The shield wiring  42 B is located at the opposite side to the write wiring  40 E with respect to the read wiring  40 D. 
     As shown in  FIG.  3 C , the shield wiring  42 B has a wiring main body  42 C and a ground connecting portion  42 D. 
     The wiring main body  42 C is located on one surface in the thickness direction of the base insulating layer  3 . One end portion of the wiring main body  42 C in the longitudinal direction is connected to the inspection terminal  42 A. In other words, the inspection terminal  42 A is located in one end portion of the shield wiring  42 B in the longitudinal direction. The wiring main body  42 C extends from the inspection terminal  42 A toward the other side in the longitudinal direction. 
     The ground connecting portion  42 D is located in the other end portion of the shield wiring  42 B in the longitudinal direction. The ground connecting portion  42 D is electrically connected to the metal support layer  2 . More specifically, the ground connecting portion  42 D is continuous with the other end portion of the wiring main body  42 C in the longitudinal direction. The ground connecting portion  42 D fills the ground opening  30 , and is in contact with the main body portion  21 . 
     Examples of a material for the conductive layer  4  include conductive materials such as copper. A thickness of the conductive layer  4  is, for example, 1 μm or more, preferably 3 μm or more, and for example, 20 μm or less, preferably 12 μm or less. 
     1-4. Cover Insulating Layer 
     As shown in  FIGS.  3 A to  3 C , the cover insulating layer  5  is disposed at 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 conductive layer  4 . 
     As shown in  FIGS.  3 A and  3 B , the cover insulating layer  5  covers the first wiring pattern  40  so as to expose the plurality of (four) slider connection terminals  40 A and the plurality of (four) external connection terminals  40 B. Further, the cover insulating layer  5  covers the second wiring pattern  41  so as to expose the plurality of (four) element connection terminals  41 A and the plurality of (two) power supply terminals  41 B. 
     As shown in  FIG.  3 C , the cover insulating layer  5  covers the shield wiring pattern  42  so as to expose the inspection terminal  42 A. Specifically, the cover insulating layer  5  has an opening  50 . The opening  50  penetrates the cover insulating layer  5  in the thickness direction. The opening  50  exposes one surface in the thickness direction of the inspection terminal  42 A. 
     Thus, one surface in the thickness direction of the slider connection terminal  40 A, one surface in the thickness direction of the power supply terminal  41 B, one surface in the thickness direction of the element connection terminal  41 A, and one surface in the thickness direction of the inspection terminal  42 A are exposed from the cover insulating layer  5 . 
     Examples of a material for the cover insulating layer  5  include synthetic resins such as polyimide resin. A thickness of the cover insulating layer  5  is, for example, 1 μm or more, preferably 2 μm or more, and for example, 10 μm or less, preferably 8 μm or less. 
     2. Continuity Inspection in Suspension Board with Circuit  1   
     Next, continuity inspection in the suspension board with circuit  1  is described with reference to  FIGS.  3 A to  3 C . 
     The continuity inspection in the suspension board with circuit  1  inspects at least disconnection and/or a short circuit of the shield wiring  42 B. In the present embodiment, the disconnection and/or the short circuit of the signal wiring  40 C, the power supply wiring  41 C, and the shield wiring  42 B are/is collectively inspected using an inspection jig which is not shown. 
     The inspection jig which is not shown has a first probe  10 , a second probe  11 , the third probe  12 , a plurality of fourth probes which are not shown, a plurality of fifth probes which are not shown, and a sixth probe which is not shown. 
     As shown in  FIG.  3 A , the first probe  10  is brought into contact with the slider connection terminal  40 A from one side in the thickness direction in the continuity inspection. 
     As shown in  FIG.  3 B , the second probe  11  is brought into contact with the first element connection terminal  41 E from one side in the thickness direction in the continuity inspection. 
     As shown in  FIG.  3 C , the third probe  12  is brought into contact with the inspection terminal  42 A from one side in the thickness direction in the continuity inspection. Although not shown, each of the first probe  10 , the second probe  11 , and the third probe  12  is electrically connected to a voltage detection circuit which is capable of detecting a voltage. 
     The plurality of fourth probes which are not shown are brought into contact with the plurality of external connection terminals  40 B from one side in the thickness direction in the continuity inspection. 
     The plurality of fifth probes which are not shown are brought into contact with the plurality of power supply terminals  41 B from one side in the thickness direction in the continuity inspection. 
     The sixth probe which is not shown is brought into contact with a portion on which the base insulating layer  3  is not disposed in the metal support layer  2  from one side in the thickness direction in the continuity inspection. Although not shown, each of the fourth probe, the fifth probe, and the sixth probe is electrically connected to a voltage application device which is capable of applying a voltage. 
     Next, the voltage application device (not shown) applies a voltage to the signal wiring  40 C via the fourth probe (not shown) which is in contact with the external connection terminal  40 B. Then, the voltage detection circuit (not shown) connected to the first probe  10  inspects disconnection and/or a short circuit of the signal wiring  40 C depending on whether or not the voltage is detected. 
     Further, the voltage application device (not shown) applies a voltage to the power supply wiring  41 C via the fifth probe (not shown) which is in contact with the power supply terminal  41 B. Then, the voltage detection circuit (not shown) connected to the second probe  11  inspects the disconnection and/or the short circuit of the power supply wiring  41 C depending on whether or not the voltage is detected. 
     The voltage application device (not shown) also applies a voltage to the metal support layer  2  via the sixth probe (not shown) which is in contact with the metal support layer  2 . Then, the voltage detection circuit (not shown) which is connected to the third probe  12  inspects the disconnection and/or the short circuit of the shield wiring  42 B depending on whether or not the voltage is detected. 
     As shown in  FIG.  1   , in the above-described suspension board with circuit  1 , the shield wiring pattern  42  is electrically connected to the metal support layer  2 , and the shield wiring  42 B provided in the shield wiring pattern  42  is disposed between the read wiring  40 D and the power supply wiring  41 C. Therefore, even when the read wiring  40 D and/or the power supply wiring  41 C are/is charged, it is possible to suppress the short circuit between the read wiring  40 D and the power supply wiring  41 C. 
     In particular, the power supply wiring  41 C electrically connected to the piezoelectric element  7  is easily charged as compared with the signal wiring  40 C. Then, when the power supply wiring  41 C is charged, and the read wiring  40 D and the power supply wiring  41 C are short-circuited, there is a problem that electrostatic breakdown of the slider  6  occurs. On the other hand, according to the above-described configuration, since the short circuit between the read wiring  40 D and the power supply wiring  41 C is suppressed, it is possible to suppress the electrostatic breakdown of the slider  6 . 
     As shown in  FIG.  3 C , the shield wiring pattern  42  has the inspection terminal  42 A located in one end portion of the shield wiring  42 B, and the ground connecting portion  42 D located in the other end portion of the shield wiring  42 B. Therefore, it is possible to bring the third probe  12  into contact with the inspection terminal  42 A, and carry out the continuity inspection of the shield wiring pattern  42 . 
     As shown in  FIGS.  3 A to  3 C , the slider connection terminal  40 A, the first element connection terminal  41 E, and the inspection terminal  42 A are exposed from the cover insulating layer  5 . Therefore, it is possible to bring the probes (the first probe  10 , the second probe  11 , and the third probe  12 ) into contact with each of the slider connection terminal  40 A, the first element terminal  41 E, and the inspection terminal  42 A from one side in the thickness direction. As a result, it is possible to collectively carry out the continuity inspection of the first wiring pattern  40 , the second wiring pattern  41 , and the shield wiring pattern  42 . 
     Second Embodiment 
     Next, a second embodiment of the wiring circuit board of the present invention is described with reference to  FIG.  4   . In the second embodiment, the same reference numerals are provided for members corresponding to each of those in the above-described first embodiment, and their detailed description is omitted. 
     In the first embodiment, the inspection terminal  42 A is exposed toward one side in the thickness direction, and the wiring circuit board of the present invention is not limited to this. In the second embodiment, as shown in  FIG.  4   , the inspection terminal  42 A is exposed from the other side in the thickness direction. In this case, the base insulating layer  3  has a first terminal opening  31 . The first terminal opening  31  penetrates the base insulating layer  3  in the thickness direction. The metal support layer  2  has a second terminal opening  20 B. The second terminal opening  20 B penetrates the metal support layer  2  in the thickness direction. The second terminal opening  20 B communicates with the first terminal opening  31  in the thickness direction. The inspection terminal  42 A fills the first terminal opening  31 , and is exposed from the other side in the thickness direction via the second terminal opening  20 B. 
     According to the second embodiment, the same function and effect as that of the first embodiment can be achieved. 
     Third Embodiment 
     Next, a third embodiment of the wiring circuit board of the present invention is described with reference to  FIG.  5   . In the third embodiment, the same reference numerals are provided for members corresponding to each of those in the above-described first embodiment, and their detailed description is omitted. 
     In the first embodiment, the inspection terminal  42 A is located in one end portion of the shield wiring pattern  42  in the longitudinal direction, and the ground connecting portion  42 D is located in the other end portion of the shield wiring pattern  42  in the longitudinal direction. However, the arrangement and the number of the inspection terminal  42 A, and the arrangement and the number of the ground connecting portion  42 D are not limited to this. 
     In the third embodiment, as shown in  FIG.  5   , the shield wiring  42 B has the wiring main body  42 C, a first ground connecting portion  42 E, and a second ground connecting portion  42 F. 
     The first ground connecting portion  42 E is located in one end portion of the shield wiring  42 B in the longitudinal direction. The second ground connecting portion  42 F is located in the other end portion of the shield wiring  42 B in the longitudinal direction. More specifically, the first ground connecting portion  42 E is continuous with one end portion of the wiring main body  42 C in the longitudinal direction. The second ground connecting portion  42 F is continuous with the other end portion of the wiring main body  42 C in the longitudinal direction. 
     In this case, the base insulating layer  3  has a first ground opening  32  and a second ground opening  33 . Each of the first ground opening  32  and the second ground opening  33  penetrates the base insulating layer  3  in the thickness direction. The first ground opening  32  and the second ground opening  33  are located at spaced intervals to each other in the longitudinal direction. The first ground connecting portion  42 E fills the first ground opening  32 , and is in contact with the main body portion  21 . The second ground connecting portion  42 F fills the second ground opening  33 , and is in contact with the main body portion  21 . 
     The inspection terminal  42 A is provided between the first ground connecting portion  42 E and the second ground connecting portion  42 F in the shield wiring pattern  42 . The inspection terminal  42 A is interposed in the middle of the wiring main body  42 C in the longitudinal direction (between one end portion and the other end portion). 
     According to the third embodiment, the same function and effect as that of the first embodiment can be achieved. 
     Fourth Embodiment 
     Next, a fourth embodiment of the wiring circuit board of the present invention is described with reference to  FIG.  6   . In the fourth embodiment, the same reference numerals are provided for members corresponding to each of those in the above-described first embodiment, and their detailed description is omitted. 
     In the fourth embodiment, as shown in  FIG.  6   , the shield wiring pattern  42  includes a first inspection terminal  42 G, a second inspection terminal  42 H, and the shield wiring  42 B. 
     The first inspection terminal  42 G and the second inspection terminal  42 H are located at spaced intervals to each other in the longitudinal direction. The first inspection terminal  42 G is located in one end portion of the shield wiring pattern  42  in the longitudinal direction. The second inspection terminal  42 H is located in the other end portion of the shield wiring pattern  42  in the longitudinal direction. 
     The shield wiring  42 B is located between the first inspection terminal  42 G and the second inspection terminal  42 H. The shield wiring  42 B is connected to the first inspection terminal  42 G and the second inspection terminal  42 H. 
     The shield wiring  42 B has the wiring main body  42 C, the first ground connecting portion  42 E, and the second ground connecting portion  42 F in the same manner as the third embodiment. Further, the base insulating layer  3  has the first ground opening  32  and the second ground opening  33  in the same manner as the third embodiment. 
     The first ground connecting portion  42 E is continuous with the first inspection terminal  42 G. The first ground connecting portion  42 E is located at the other side with respect to the first inspection terminal  42 G in the longitudinal direction. The second ground connecting portion  42 F is continuous with the second inspection terminal  42 H. The second ground connecting portion  42 F is located at one side with respect to the second inspection terminal  42 H in the longitudinal direction. 
     In this case, the cover insulating layer  5  has a first opening  51  and a second opening  52 . 
     The first opening  51  exposes one surface in the thickness direction of the first inspection terminal  42 G. The second opening  52  exposes one surface in the thickness direction of the second inspection terminal  42 H. 
     In the fourth embodiment, though not shown, the continuity inspection is carried out in a state where the third probe  12  (ref:  FIG.  3 C ) is in contact with the first inspection terminal  42 G, and the sixth probe which is not shown is in contact with the second inspection terminal  42 H. 
     According to the fourth embodiment, the same function and effect as that of the first embodiment can be achieved. 
     Fifth Embodiment 
     Next, a fifth embodiment of the wiring circuit board of the present invention is described with reference to  FIG.  7   . In the fifth embodiment, the same reference numerals are provided for members corresponding to each of those in the above-described first embodiment, and their detailed description is omitted. 
     In the first embodiment, the shield wiring pattern  42  includes the inspection terminal  42 A, and the ground connecting portion  42 D separately. However, the present invention is not limited to this. The inspection terminal may also serve as a ground connecting portion. 
     In the fifth embodiment, as shown in  FIG.  7   , the shield wiring pattern  42  includes the first inspection terminal  42 G and the second inspection terminal  42 H in the same manner as the fourth embodiment. The first inspection terminal  42 G also serves as a first ground connecting portion, and the second inspection terminal  42 H also serves as a second ground connecting portion. In this case, the base insulating layer  3  has the first ground opening  32  and the second ground opening  33 , and the cover insulating layer  5  has the first opening  51  and the second opening  52  in the same manner as the fourth embodiment. 
     The first inspection terminal  42 G is continuous with one end portion of the wiring main body  42 C in the longitudinal direction. The first inspection terminal  42 G fills the first ground opening  32 , and is in contact with the main body portion  21 . The second inspection terminal  42 H is continuous with the other end portion of the wiring main body  42 C in the longitudinal direction. The second inspection terminal  42 H fills the second ground opening  33 , and is in contact with the main body portion  21 . 
     According to the fifth embodiment, the same function and effect as that of the first embodiment can be achieved. 
     Modified Examples 
     In the above-described first to fifth embodiments, the shield wiring  42 B is adjacent to the power supply wiring  41 C and the read wiring  40 D. However, the wiring circuit board of the present invention is not limited to this. For example, another wiring may be also disposed between the shield wiring  42 B and the read wiring  40 D. 
     In the above-described first to fifth embodiments, the suspension board with circuit  1  is used as one example of a wiring circuit board. However, the wiring circuit board is not limited to the suspension board with circuit  1 . The wiring circuit board may be also a flexible printed wiring board with a reinforcing layer including the metal support layer  2  as a reinforcing layer. 
     Each modified example can achieve the same function and effect as that of the above-described first embodiment. Furthermore, the first to fifth embodiments and the modified examples can be appropriately used in combination. 
     While the illustrative embodiments of the present invention are provided in the above description, such is for illustrative purpose only and it is not to be construed as limiting the scope of the present invention. Modification and variation of the present invention that will be obvious to those skilled in the art is to be covered by the following claims. 
     INDUSTRIAL APPLICATION 
     The wiring circuit board of the present invention is, for example, used for various applications such as wiring circuit boards for an electronic device (wiring circuit board for an electronic component), wiring circuit boards for an electrical device (wiring circuit board for an electrical component), and the like. 
     DESCRIPTION OF REFERENCE NUMERALS 
     
         
         
           
               1  Suspension board with circuit 
               1 A First mounting region 
               1 B Second mounting region 
               2  Metal support layer 
               3  Base insulating layer 
               4  Conductive layer 
               40  First wiring pattern 
               40 A Slider connection terminal 
               40 D Read wiring 
               41  Second wiring pattern 
               41 E First element connection terminal 
               42  Shield wiring pattern 
               42 A Inspection terminal 
               42 B Shield wiring 
               42 D Ground connecting portion 
               42 E First ground connecting portion 
               42 F Second ground connecting portion 
               42 G First inspection terminal 
               42 H Second inspection terminal 
               5  Cover insulating layer 
               6  Slider 
               7  Piezoelectric element