JP2016167328A - Suspension substrate with circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suspension substrate with a circuit capable of widening a band and suppressing enlargement while adjusting impedance.SOLUTION: A suspension substrate 1 with a circuit includes a support substrate 5, a base insulation layer 6 and a conductor pattern 8. The support substrate 5 includes: a gimbal part 12; a main body part 19 extending in a front-rear direction continuously from the gimbal part 12; and a plurality of projections 21 projecting outward with regard to a longitudinal direction continuously from the main body part 19 and arranged at intervals with each other in the front-rear direction. The conductor pattern 8 includes plural pieces of wiring 24 extending in the front-rear direction and arranged at intervals with each other in the longitudinal direction. The plural pieces of wiring 24 are arranged so as to intersect with the plurality of projections 21 when observed in a vertical direction.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a suspension board with circuit, and more particularly to a suspension board with circuit used for a hard disk drive.

  Conventionally, a suspension board with circuit on which a slider having a magnetic head is mounted and mounted on a hard disk drive is known. The suspension board with circuit includes a metal suspension, an insulating layer disposed on the metal suspension, and a plurality of wirings disposed on the insulating layer.

  In such a suspension board with circuit, it is desired to adjust the impedance.

  For example, a head gimbal assembly is proposed in which a plurality of signal lead conductors are formed on a metal suspension via an insulating layer, and a plurality of through holes are formed in the metal suspension below the plurality of signal lead conductors. (For example, refer to Patent Document 1).

  In such a head gimbal assembly, a plurality of through holes are formed below the plurality of signal lead conductors, thereby reducing the area of the metal suspension facing the plurality of signal lead conductors and adjusting the impedance. ing.

JP 2002-251706 A

  However, in recent years, in order to improve the communication path capacity of the suspension board with circuit, there has been a demand for a wider band.

  However, in the head gimbal assembly described in Patent Document 1, it is necessary to secure a sufficient interval between a plurality of signal lead conductors in order to increase the bandwidth.

  In this case, in order to adjust the impedance, it is necessary to enlarge the through hole so that the through hole overlaps with the plurality of signal lead conductors. However, there is a problem that the head gimbal assembly is enlarged.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a suspension board with circuit that can suppress the increase in size while being able to increase the bandwidth and adjust the impedance.

  The suspension board with circuit of the present invention includes a metal support layer, a base insulating layer disposed on one side in the thickness direction of the metal support layer, a conductor pattern disposed on one side in the thickness direction of the base insulating layer, The metal support layer includes a mounting side end portion on which a slider is mounted, a main body portion extending in a predetermined direction continuously from the mounting side end portion, and a predetermined direction continuously from the main body portion. A plurality of protrusions protruding outward in the intersecting direction and spaced apart from each other in the predetermined direction, the conductor pattern extending in the predetermined direction and spaced from each other in the intersecting direction It is characterized by comprising a plurality of wirings arranged at intervals, and the plurality of wirings are arranged so as to intersect with the plurality of protruding portions when viewed from the thickness direction.

  According to such a configuration, since the plurality of wirings are arranged so as to intersect with the plurality of protrusions when viewed from the thickness direction, the plurality of protrusions are connected to the plurality of wirings via the base insulating layer. It is arranged to face each other.

  Therefore, while the plurality of protruding portions can support the plurality of wirings via the base insulating layer, the area of the metal support layer facing the plurality of wirings can be reduced, and the impedance can be easily adjusted.

  Moreover, since the free end portions (end portions opposite to the main body portion) of the plurality of protrusions are not connected to each other in a predetermined direction, when the free end portions of the plurality of protrusions are connected to each other, that is, Compared with the case where a through hole is formed between adjacent protrusions among the plurality of protrusions, the metal support layer in the intersecting direction can be reduced in size.

  Therefore, it is possible to suppress an increase in the size of the suspension board with circuit even if a sufficient interval between the plurality of wirings in the crossing direction is secured to achieve a wide band.

  Moreover, it is preferable that the space | interval between mutually adjacent protrusion parts is 2 times or more and 200 times or less with respect to the dimension of the said predetermined direction of each of these protrusion parts among these protrusion parts. is there.

  According to such a configuration, since the interval between the adjacent protrusions is not less than 2 times and not more than 200 times the dimension of the protrusions in the predetermined direction, the impedance can be adjusted more reliably. However, the plurality of protrusions can reliably support the plurality of wirings via the insulating base layer.

  In addition, the main body has a cutout portion that is cut out from the outer side to the inner side in the intersecting direction in the predetermined direction, and each of the plurality of projecting portions is an edge of the notch portion in the intersecting direction. It is preferable to project toward the outside in the crossing direction.

  According to such a configuration, the plurality of projecting portions project from the edge of the notched portion that is notched inward from the outer side in the intersecting direction, and thus the metal support layer can include the plurality of projecting portions. However, it is possible to reliably suppress an increase in size in the crossing direction.

  With the suspension board with circuit of the present invention, it is possible to increase the bandwidth and to adjust the impedance while suppressing an increase in size.

FIG. 1 is a plan view of an embodiment of a suspension board with circuit of the present invention, showing a state in which a base insulating layer and a cover insulating layer are removed. FIG. 2 is an enlarged plan view of the wiring portion shown in FIG. 1 and shows a state where a cover insulating layer is removed. 3A is a cross-sectional view taken along line AA of the wiring portion shown in FIG. 3B is a cross-sectional view taken along the line BB of the wiring portion shown in FIG.

  As shown in FIG. 1, the suspension board with circuit 1 mounts a slider 50 having a magnetic head (not shown) and is electrically connected to an external board 51 in a hard disk drive (not shown). Mounted on.

  The suspension board with circuit 1 has a substantially flat belt shape extending in a predetermined direction. The suspension board with circuit 1 is arranged on one side in the predetermined direction (upper side of the paper in FIG. 1), and is mounted on the mounting portion 2 on which the slider 50 is mounted, and on the other side in the predetermined direction (lower side of the paper in FIG. 1). The external connection unit 3 connected to the external substrate 51 and the wiring unit 4 extending in a predetermined direction between the mounting unit 2 and the external connection unit 3 are provided.

  In the following description, when referring to the direction, one side in the predetermined direction in which the mounting portion 2 is provided is the front side of the suspension board with circuit 1 and the other side in the predetermined direction in which the external connection portion 3 is provided. This is the rear side of the suspension board with circuit 1. That is, the front-rear direction is an example of the predetermined direction.

  In FIG. 1, the left side of the paper is the left side of the suspension board with circuit 1, the right side of the paper is the right side of the suspension board with circuit 1, the front side of the paper is the upper side of the suspension board with circuit 1, and the back side of the paper is the suspension with circuit. It is the lower side of the substrate 1. Specifically, the direction arrow shown in each figure is used as a reference. Moreover, the left-right direction is an example of the cross direction, and the up-down direction is an example of the thickness direction.

  As shown in FIG. 3B, such a suspension board with circuit 1 has a laminated structure, and includes a support board 5 as an example of a metal support layer, a base insulating layer 6, a conductor pattern 8, and a cover insulation. The layer 7 is provided in order from the lower side to the upper side.

  In FIG. 1, for the sake of convenience, the base insulating layer 6 and the cover insulating layer 7 are omitted, and in FIG. 2, the cover insulating layer 7 is omitted.

  As shown in FIG. 1, the support substrate 5 has a substantially flat plate shape extending in the front-rear direction, and includes a gimbal portion 12, a substrate wiring portion 13, and a substrate connection portion 18 as an example of a mounting side end portion. It is prepared as one.

  The gimbal portion 12 is the tip portion of the support substrate 5 and corresponds to the mounting portion 2. The gimbal portion 12 includes a pair of outriggers 14, a first connection portion 15, a second connection portion 16, and a support portion 17.

  The pair of outriggers 14 are arranged at the left and right ends of the gimbal portion 12 and are spaced apart from each other in the left-right direction. Each of the pair of outriggers 14 has a substantially rectangular shape in plan view extending in the front-rear direction.

  The 1st connection part 15 is constructed between the front-end | tip parts of a pair of outriggers 14, and has the substantially rectangular shape in planar view extended in the left-right direction.

  The second connecting portion 16 is provided between the rear end portions of the pair of outriggers 14, and is disposed at a rear side with respect to the first connecting portion 15. The 2nd connection part 16 has planar view substantially rectangular shape extended in the left-right direction.

  The support portion 17 is disposed in the central portion of the gimbal portion 12 so as to be surrounded by the pair of outriggers 14, the first connection portion 15, and the second connection portion 16.

  The support portion 17 is continuous from substantially the center in the left-right direction at the rear end edge of the first connecting portion 15 and protrudes toward the rear side, and has a substantially rectangular shape in plan view. Further, the support portion 17 is disposed with a space in the left-right direction with respect to the outrigger 14, and is disposed with a space in the front side with respect to the second connecting portion 16.

  The board wiring portion 13 is disposed on the rear side of the gimbal portion 12 and includes a main body portion 19 and a plurality of protruding portions 21.

  The main body 19 has a substantially rectangular shape in plan view, extending from the substantially horizontal center in the left-right direction at the rear end edge of the second connecting portion 16 toward the rear side and extending in the front-rear direction. Moreover, the main-body part 19 has the recessed part 20 as an example of a notch part.

  The concave portion 20 is disposed on the left side portion of the main body portion 19 and has a substantially concave shape in plan view that opens toward the left side. That is, the concave portion 20 is formed by cutting out a middle portion (center portion) in the front-rear direction in the left portion of the main body portion 19 from the left side to the right side in a substantially rectangular shape in plan view. The right end edge 20A of the recess 20 extends along the front-rear direction.

  The horizontal dimension of the recess 20 is, for example, 10% or more, preferably 20% or more, for example, 80% or less, preferably 70% or less with respect to the horizontal dimension of the main body 19. The front-rear dimension of the recess 20 is, for example, 0.1% or more, preferably 0.5% or more, for example, 50% or less, preferably 30% or less, with respect to the front-rear direction dimension of the main body 19. It is.

  The plurality of projecting portions 21 are arranged in the recess 20 so as to be substantially comb-shaped and spaced from each other in the front-rear direction. Each of the plurality of protrusions 21 has a substantially rectangular shape in plan view extending thinly in the left-right direction, and continuously protrudes from the right end edge 20A of the recess 20 toward the left side.

  The number of the plurality of protrusions 21 is not particularly limited as long as it is a plurality (two or more), but is, for example, three or more, preferably five or more, for example, 100 or less, preferably 50 or less. .

  The sum total of the areas of the plurality of protrusions 21 (the area of the surface along the front-rear direction and the left-right direction) is, for example, 0.5% or more, for example, 50% or less, preferably 30% with respect to the area of the recess 20. Hereinafter, it is more preferably 10% or less. Moreover, the area per protrusion 21 is, for example, 0.5% or more, preferably 1% or more, for example, 50% or less, preferably 30% or less, relative to the area of the recess 20. .

  Moreover, the horizontal dimension of the protrusion 21 is substantially the same as the horizontal dimension of the recess 20, and is, for example, 50 μm or more, preferably 100 μm or more, for example, 1000 μm or less, preferably 500 μm or less.

  Further, the front-rear dimension L of the protrusion 21 is, for example, 20 μm or more, preferably 40 μm or more, for example, 500 μm or less, preferably 250 μm or less, as shown in FIG. 3A.

  If the front-rear dimension L of the protrusion 21 is equal to or greater than the above lower limit, the protrusion 21 can be configured to bend in the vertical direction while the rigidity of the protrusion 21 can be ensured. If L is less than or equal to the above upper limit, the area of the protruding portion 21 facing the wiring 24 described later can be reliably reduced.

  Further, among the plurality of protrusions 21, the interval S1 between the adjacent protrusions 21 is, for example, 2 times or more, preferably 5 times or more, for example, the dimension L in the front-rear direction of the protrusions 21. , 200 times or less, preferably 100 times or less.

  As shown in FIG. 1, the board connecting portion 18 has a substantially rectangular shape in plan view extending continuously from the rear end portion of the main body portion 19 of the board wiring portion 13 and extending rearward.

  The support substrate 5 is made of, for example, a metal material such as stainless steel, 42 alloy, aluminum, copper-beryllium, or phosphor bronze, and is preferably made of stainless steel. The thickness of the support substrate 5 is, for example, 10 μm or more, preferably 15 μm or more, for example, 35 μm or less, preferably 25 μm or less.

  As shown in FIGS. 1 and 3B, the base insulating layer 6 is provided as a predetermined pattern corresponding to the conductor pattern 8 on the upper surface of the support substrate 5, and is mounted on the gimbal portion 12. (Not shown), a base wiring portion 10 disposed on the substrate wiring portion 13, and a base connection portion (not illustrated) disposed on the substrate connecting portion 18.

  The base wiring portion 10 continuously extends from the rear end portion of the base mounting portion (not shown) toward the rear side, and is continuous with the front end portion of the base connection portion (not shown). Further, as shown in FIGS. 2 and 3A, the base wiring portion 10 includes a covering portion 10A that covers the concave portion 20 from above.

  10 A of coating | coated parts are the left side parts of the base wiring part 10, Comprising: It extends in the front-back direction so that the recessed part 20 may be straddled in the front-back direction. Further, the left end edge of the covering portion 10 </ b> A is located slightly to the left of the left end edge of the protruding portion 21, and the right end edge of the covering portion 10 </ b> A is located to the right of the right end edge 20 </ b> A of the recess 20. That is, the covering portion 10 </ b> A overlaps with all the protruding portions 21 when viewed from the vertical direction, and is disposed on the upper surface of all the protruding portions 21.

  The base insulating layer 6 is formed of, for example, a synthetic resin such as polyimide resin, polyamideimide resin, acrylic resin, polyether resin, nitrile resin, polyethersulfone resin, polyethylene terephthalate resin, polyethylene naphthalate resin, or polyvinyl chloride resin. Preferably, it is formed from a polyimide resin.

  The insulating base layer 6 has a thickness of, for example, 1 μm or more, preferably 3 μm or more, for example, 25 μm or less, preferably 15 μm or less.

  The conductor pattern 8 is disposed on the upper surface of the base insulating layer 6 as shown in FIG. 3B. As shown in FIG. 1, the conductor pattern 8 includes a first conductor pattern 60 and a second conductor pattern 61.

  The first conductor pattern 60 is disposed on the upper surface of the left portion of the base insulating layer 6, which is the left portion of the conductor pattern 8. The first conductor pattern 60 includes a plurality (four) of head-side terminals 22, a plurality (four) of external-side terminals 23, and a plurality of (four) wirings 24.

  The plurality of head-side terminals 22 are arranged on the front side portion of the base mounting portion (not shown) so as to overlap the left side portion at the rear end portion of the first connecting portion 15 in plan view. The plurality of head-side terminals 22 are arranged at intervals in the left-right direction.

  More specifically, the plurality of head-side terminals 22 include a first head-side terminal 26, a second head-side terminal 27, a third head-side terminal 28, and a fourth head-side terminal 29. The 1st head side terminal 26, the 2nd head side terminal 27, the 3rd head side terminal 28, and the 4th head side terminal 29 are arrange | positioned at intervals in order toward the right side from the left side.

  The plurality of external terminals 23 are arranged on a base connection portion (not shown) so as to overlap the left side portion of the substrate connection portion 18 in plan view. The plurality of external terminals 23 are arranged at intervals in the left-right direction.

  More specifically, the plurality of external terminals 23 include a first external terminal 34, a second external terminal 35, a third external terminal 36, and a fourth external terminal 37. The first external side terminal 34, the second external side terminal 35, the third external side terminal 36, and the fourth external side terminal 37 are on the left side portion of the base connection portion (not shown), and from the right side to the left side. Are arranged in order at intervals.

  The plurality of wirings 24 extend in the front-rear direction, and electrically connect the plurality of head-side terminals 22 and the plurality of external-side terminals 23.

  More specifically, the plurality of wirings 24 include a first writing wiring 42, a second writing wiring 43, a third writing wiring 44, and a fourth writing wiring 45.

  Note that the first write wiring 42 and the second write wiring 43 constitute a first differential signal wiring pair, and the third write wiring 44 and the fourth write wiring 45 have the second difference. A dynamic signal wiring pair is configured. In a state where the suspension board with circuit 1 is mounted on a hard disk drive (not shown), the first electrical signal is transmitted to the first write wiring 42 and the first electrical signal is transmitted to the second write wiring 43. A second electrical signal of opposite phase is transmitted. A third electrical signal is transmitted to the third write wiring 44, and a fourth electrical signal having a phase opposite to that of the third electrical signal is transmitted to the fourth write wiring 45.

  The first write wiring 42 electrically connects the first head side terminal 26 and the first external side terminal 34. As shown in FIGS. 1 and 2, the first write wiring 42 is continuous from the front end of the first head side terminal 26, and the left side portion of the base mounting portion (not shown) and the base wiring portion 10. Are sequentially connected to the front end portion of the first external terminal 34 on a base connection portion (not shown).

  Further, as shown in FIG. 2, the first write wiring 42 extends along the front-rear direction on the covering portion 10 </ b> A, and is spaced on the left side with respect to the right edge 20 </ b> A of the recess 20 when viewed from the vertical direction. And is disposed so as to overlap the right end portion of the protruding portion 21. As shown in FIG. 3B, the dimension (width) W1 of the first write wiring 42 in the left-right direction is, for example, 8 μm or more, preferably 10 μm or more, for example, 200 μm or less, preferably 120 μm or less.

  If the width W1 of the first write wiring 42 is equal to or greater than the lower limit, the impedance can be reliably reduced. If the width W1 of the first write wiring 42 is equal to or smaller than the upper limit, the suspension board with circuit 1 Can be reliably prevented from becoming large in the left-right direction.

  As shown in FIGS. 1 and 2, the second write wiring 43 electrically connects the second head side terminal 27 and the second external side terminal 35. The second write wiring 43 is continuously parallel to the first write wiring 42 with a space outward from the first write wiring 42 continuously from the tip portion of the second head side terminal 27. And is connected to the tip of the second external terminal 35.

  Further, as shown in FIG. 2, the second write wiring 43 extends along the front-rear direction on the covering portion 10A, and on the left side with respect to the first write wiring 42 as shown in FIG. 3B. They are arranged with an interval S2.

  The distance S2 between the first write wiring 42 and the second write wiring 43 is, for example, 8 μm or more, preferably 10 μm or more, for example, 100 μm or less, preferably 50 μm or less.

  If the distance S2 between the first write wiring 42 and the second write wiring 43 is equal to or greater than the lower limit, the first write wiring 42 and the second write wiring 43 can be surely widened. If the distance S2 between the first write wiring 42 and the second write wiring 43 is equal to or smaller than the upper limit, the suspension board with circuit 1 can be reliably prevented from becoming large in the left-right direction.

  In addition, the horizontal dimension (width) W2 of the second write wiring 43 is, for example, 1.0 times or more, preferably 1.5 times or more, for example, the width W1 of the first write wiring 42. 2.5 times or less, preferably 2.0 times or less, specifically, 8 μm or more, preferably 10 μm or more, for example, 200 μm or less, preferably 120 μm or less.

  If the width W2 of the second write wiring 43 is equal to or greater than the lower limit, the impedance can be reliably reduced, and if the width W2 of the second write wiring 43 is equal to or smaller than the upper limit, the suspension board with circuit 1 Can be reliably prevented from becoming large in the left-right direction.

  As shown in FIGS. 1 and 2, the third write wiring 44 electrically connects the third head side terminal 28 and the third external side terminal 36. The third write wiring 44 is continuously parallel to the second write wiring 43 with a space outward from the second write wiring 43 continuously from the tip of the third head-side terminal 28. And is connected to the tip of the third external terminal 36.

  Further, as shown in FIG. 2, the third write wiring 44 extends along the front-rear direction on the covering portion 10A, and on the left side with respect to the second write wiring 43 as shown in FIG. 3B. It arrange | positions at intervals S3.

  The distance S3 between the second write wiring 43 and the third write wiring 44 is, for example, the same as the size range of the distance S2 between the first write wiring 42 and the second write wiring 43, Preferably, it is the same value as the interval S <b> 2 between the first write wiring 42 and the second write wiring 43.

  The horizontal dimension (width) W3 of the third write wiring 44 is, for example, the same as the dimension range of the width W2 of the second write wiring 43, and preferably the width W2 of the second write wiring 43. Is the same value as

  As shown in FIGS. 1 and 2, the fourth write wiring 45 electrically connects the fourth head side terminal 29 and the fourth external side terminal 37. The fourth write wiring 45 is continuously parallel to the third write wiring 44 with a space outward from the third write wiring 44 continuously from the tip of the fourth head-side terminal 29. And is connected to the tip of the fourth external terminal 37.

  Further, as shown in FIG. 2, the fourth write wiring 45 extends along the front-rear direction on the covering portion 10A, and on the left side with respect to the third write wiring 44 as shown in FIG. 3B. It arrange | positions at intervals S4.

  The distance S4 between the third write wiring 44 and the fourth write wiring 45 is, for example, the same as the dimension range of the distance S2 between the first write wiring 42 and the second write wiring 43, Preferably, it is the same value as the interval S <b> 2 between the first write wiring 42 and the second write wiring 43.

  That is, in the present embodiment, the first write wiring 42, the second write wiring 43, the third write wiring 44, and the fourth write wiring 45 are equidistant from each other in the left-right direction on the covering portion 10A. Are arranged.

  The fourth write wiring 45 overlaps with the left end of the protruding portion 21 when viewed from the top and bottom directions, and the left end edge of the fourth write wiring 45 is the left end edge of the projecting portion 21 when viewed from the top and bottom directions. Is almost the same.

  In other words, each of the first write wiring 42, the second write wiring 43, the third write wiring 44, and the fourth write wiring 45 is viewed from above and below on the covering portion 10A as shown in FIG. The main body 19 overlaps the concave portion 20 and extends so as to be orthogonal to (intersect) the plurality of protrusions 21.

  The horizontal dimension (width) W4 of the fourth write wiring 45 is, for example, the same as the dimension range of the width W1 of the first write wiring 42, and preferably the width W1 of the first write wiring 42. Is the same value as

  As shown in FIG. 1, the second conductor pattern 61 is a right side portion of the conductor pattern 8 and is arranged on the right side with respect to the first conductor pattern 60 with an interval. In the present embodiment, the second conductor pattern 61 is symmetrical with respect to an imaginary line that passes through the center in the left-right direction between the first conductor pattern 60 and the second conductor pattern 61 and extends along the front-rear direction (180 ° rotational symmetry). Therefore, although detailed description of the second conductor pattern 61 is omitted, the second conductor pattern 61 includes a plurality of (four) head-side terminals 30 and a plurality (four) of the second conductor pattern 61, as in the first conductor pattern 60. An external terminal 38 and a plurality of (four) wires 46 are provided. The plurality of wirings 46 of the second conductor pattern 61 are, for example, reading wirings, heater wirings, sensor wirings, and the like.

  The conductor pattern 8 is made of a conductor material such as copper, nickel, gold, solder, or an alloy thereof, and is preferably made of copper.

  The thickness of the conductor pattern 8 is, for example, 1 μm or more, preferably 3 μm or more, for example, 20 μm or less, preferably 12 μm or less.

  As shown in FIGS. 3A and 3B, the insulating cover layer 7 is disposed on the upper surface of the insulating base layer 6 so as to cover the plurality of wirings 24 of the conductor pattern 8 from above. The plurality of head-side terminals 22, the plurality of head-side terminals 30, the plurality of external-side terminals 23, and the plurality of external-side terminals 38 are exposed from the cover insulating layer 7.

  The insulating cover layer 7 is made of the same synthetic resin as that of the insulating base layer 6, and is preferably made of a polyimide resin. The thickness of the insulating cover layer 7 is appropriately set.

  Such a suspension board with circuit 1 can be manufactured by a known manufacturing method.

  For example, a varnish containing a photosensitive synthetic resin is applied on the support substrate 5 and dried, and then exposed and developed to form the base insulating layer 6.

  Next, the conductor pattern 8 is formed in the above pattern on the upper surface of the base insulating layer 6 by, for example, an additive method or a subtractive method. Thereafter, for example, a varnish containing a photosensitive synthetic resin is applied to the base insulating layer 6 and the conductor pattern 8 and dried, and then exposed and developed to form the cover insulating layer 7.

  Next, the outer shape of the support substrate 5 is processed by a known processing method (for example, etching, drilling, laser processing, etc.) so that the recess 20 and the plurality of protrusions 21 are formed.

  As described above, the suspension board with circuit 1 is manufactured.

  In such a suspension board with circuit 1, the first write wiring 42, the second write wiring 43, the third write wiring 44, and the fourth write wiring 45 (hereinafter referred to as a plurality of write wirings 42 to 45). 2) are arranged so as to be orthogonal to (intersect) the plurality of protrusions 21 when viewed in the vertical direction, as shown in FIG. 2. Therefore, the plurality of projecting portions 21 are arranged so as to face the plurality of write wirings 42 to 45 via the covering portion 10A of the base wiring portion 10 as shown in FIGS. 3A and 3B.

  Therefore, the plurality of protruding portions 21 can support the plurality of write wirings 42 to 45 via the covering portion 10 </ b> A of the base wiring portion 10, but support substrate 5 facing the plurality of write wirings 42 to 45. Can be reduced, and the impedance can be easily adjusted.

  In addition, since the left end portions of the plurality of protruding portions 21 are not connected to each other in the front-rear direction, the support substrate 5 in the left-right direction can be reduced in size.

  Therefore, as shown in FIG. 3B, an interval S2 between the first write wiring 42 and the second write wiring 43, an interval S3 between the second write wiring 43 and the third write wiring 44, and Even if each of the spacings S4 between the third write wiring 44 and the fourth write wiring 45 is sufficiently ensured to increase the bandwidth, the suspension board with circuit 1 can be prevented from being enlarged.

  Further, as shown in FIG. 3A, among the plurality of protrusions 21, the interval S <b> 1 between the adjacent protrusions 21 is not less than 2 times and not more than 200 times the front-rear direction dimension L of the protrusions 21. .

  Therefore, while the impedance can be adjusted more reliably, the plurality of protruding portions 21 can reliably support the plurality of write wirings 42 to 45 through the covering portion 10A of the base wiring portion 10. .

  In addition, as shown in FIGS. 1 and 2, the recess 20 is formed by notching the left side portion of the main body 19 from the left side toward the right side, and the plurality of protrusions 21 protrude from the right edge 20 </ b> A of the recess 20. ing.

  Therefore, the support substrate 5 can be reliably provided with a plurality of protruding portions 21 and can be reliably prevented from increasing in size in the left-right direction.

  In the above embodiment, the main body 19 has the recess 20, but the present invention is not limited to this, and the main body 19 does not have the recess 20 as indicated by a virtual line in FIG. 1. Also good. In this case, the plurality of protrusions 21 protrude from the left end edge 19 </ b> A of the main body 19 toward the left side. In addition, although the dimension in the left-right direction of the main body 19 that does not have the recess 20 is not particularly limited, it is smaller than the main body 19 having the recess 20 (the above-described embodiment) to reduce the size of the suspension board with circuit 1. It is preferable from the viewpoint.

  In the above embodiment, the recess 20 is an example of a notch, but the shape of the notch is not particularly limited. For example, in addition to the recess 20, the notch includes a portion 20 </ b> B between the leading edge of the main body 19 and the recess 20, or a rear edge of the main body 19 and the recess 20, as indicated by phantom lines in FIG. 1. The portion 20C between the two may be further cut away.

  Moreover, in said embodiment, although the recessed part 20 is arrange | positioned in the left side part of the main-body part 19, and the some protrusion part 21 protrudes from 20 A of right end edges of the recessed part 20, it is not limited to this, The recessed part 20 is a main body. You may arrange | position in the right side part of the part 19. FIG. In this case, the plurality of protrusions 21 protrude from the left edge of the recess 20 toward the right side, and the plurality of wirings 46 of the second conductor pattern 61 are orthogonal to (intersect) the plurality of protrusions 21 when viewed in the vertical direction. To be arranged. A plurality of protrusions 21 can also be provided on both the left and right sides of the main body 19.

  In the above embodiment, as shown in FIG. 2, the wiring 24 intersecting with the plurality of protruding portions 21 when viewed from the top and bottom is the plurality of writing wirings 42 to 45, but is not limited thereto. The wiring 24 intersecting with the plurality of protruding portions 21 may be various signal wirings such as a reading wiring, for example.

  In the above embodiment, as shown in FIG. 1, all of the plurality of wirings 24 electrically connect the head side terminal 22 and the external side terminal 23, and all of the plurality of wirings 46 are connected to the head side. Although the terminal 30 and the external terminal 38 are electrically connected, the present invention is not limited to this, and the plurality of wirings 24 and / or the plurality of wirings 46 may include ground wirings that are grounded to the support substrate 5. .

  Also according to these modified examples, the same effects as those of the above embodiment can be obtained. In addition, each of said embodiment and modification can be combined suitably.

DESCRIPTION OF SYMBOLS 1 Suspension board with a circuit 5 Support board 6 Base insulating layer 8 Conductive pattern 12 Gimbal part 19 Main body part 20 Recess 20A The right edge of a recessed part 21 Protrusion part 24 Wiring 42 1st writing wiring 43 2nd writing wiring 44 3rd writing Wiring 45 4th writing wiring L Dimension in the front-rear direction of the protruding portion S1 Interval between adjacent protruding portions among the plurality of protruding portions

Claims (3)

A metal support layer;
A base insulating layer disposed on one side in the thickness direction of the metal support layer;
A conductor pattern disposed on one side in the thickness direction of the base insulating layer,
The metal support layer is
Mounting side end where the slider is mounted,
A main body extending in a predetermined direction continuously from the mounting side end; and
A plurality of projecting portions that continuously extend from the main body portion and project toward the outside in the intersecting direction intersecting the predetermined direction, and are spaced apart from each other in the predetermined direction;
The conductor pattern includes a plurality of wirings extending in the predetermined direction and spaced from each other in the intersecting direction,
The suspension board with circuit, wherein the plurality of wirings are arranged so as to intersect with the plurality of protrusions when viewed in the thickness direction.   Of the plurality of protrusions, an interval between adjacent protrusions is not less than 2 times and not more than 200 times the dimension of each of the plurality of protrusions in the predetermined direction. The suspension board with circuit according to claim 1. The main body portion has a notch portion that is notched inward from the outside in the intersecting direction in the predetermined direction,
3. The suspension board with circuit according to claim 1, wherein each of the plurality of protrusions protrudes outward from the edge of the notch in the intersecting direction. 4.

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