JP6633410B2 - Cable joint and ultrasonic joining equipment - Google Patents

Description

  The present invention relates to a cable joint having a cable and an object to be joined made of metal, and an ultrasonic joining device used for producing such a cable joint.

  BACKGROUND ART Conventionally, there is known a cable joined body in which a conductor of a cable is electrically and mechanically joined to an object to be joined such as a metal terminal by ultrasonic joining (for example, see Patent Document 1). Such a cable joined body has a joined cable portion in which a cable is joined to an object to be joined, and an extended cable portion extending from the joined cable portion. At this time, in the ultrasonic bonding apparatus used for bonding, the anvil as a mounting table for the object to be bonded and the horn as a vibrator sandwich the above-described bonding cable portion and the object to be bonded, and the ultrasonic wave Vibrate. Thereby, the conductor in the joint cable portion is solid-phase joined to the joining object. Here, in many cases, the horn is provided with a protruding pressing portion pressed against the joint cable portion, and the cable joint has a state in which a concave pressing mark is formed on the joint cable portion. At this pressing mark, the conductor is solid-phase bonded to the object to be bonded.

JP 2009-043538 A

  Here, in the cable joined body as described above, as the joining range of the ultrasonic joining is wider, better joining strength is obtained. On the other hand, the pressure marks formed by the ultrasonic bonding tend to make the cable thinner and its strength tends to decrease. Therefore, from the viewpoint of the strength of the cable, it is desirable to suppress the bonding range of the ultrasonic bonding as much as possible.

  The extension cable portion extending from the junction cable portion may be pulled or bent at the time of, for example, a cable jointing work. In such a case, since the stress tends to concentrate on a portion of the pressing mark closest to the extended cable portion, there is a demand for suppressing a decrease in cable strength in such a portion as much as possible.

  Therefore, the present invention pays attention to the above-mentioned demands, and suppresses a decrease in cable strength at a place where stress tends to concentrate at a pressing mark applied at that time while obtaining good joining strength by ultrasonic joining. It is an object of the present invention to provide an improved cable assembly. Another object of the present invention is to provide an ultrasonic bonding apparatus capable of manufacturing such a cable bonded body.

In order to solve the above problems, a cable joined body of the present invention is a cable joined body comprising: a cable; and a metal joining object in which conductors of the cable are electrically and mechanically joined by ultrasonic joining. Wherein the cable has a joining cable portion that is placed on the joining object and joined by the ultrasonic joining, and an extending cable portion that extends from the joining cable portion, the cable portion, the pressing mark a plurality have a point-like scars concave attached by pressing during the ultrasonic bonding is formed, prior Symbol of the sum of the length of the point-trace in the width direction of the cable, the width ratio to the length of the cable in the direction closest recent part on the extending cable portion in the press marks, rather smaller than the other portion of the pressing mark, before in the last partial The point-like traces and said point-trace in the other portion, characterized in that the formation position in the width direction are shifted from each other.

  In the cable joined body of the present invention, favorable joint strength by ultrasonic joining is ensured by the above-mentioned other portion which relatively occupies a relatively large proportion in the width direction of the cable in the pressing mark. On the other hand, in the pressing mark, the ratio of the nearest portion closest to the extended cable portion where the stress tends to concentrate when the extended cable portion is moved or the like is suppressed to be smaller than the ratio of the other portions. As a result, a decrease in cable strength is suppressed in the above-described nearest portion where stress tends to concentrate at the pressing mark. As described above, according to the present invention, a cable joint body in which a good joint strength by ultrasonic joining is obtained, but a decrease in cable strength in a portion where stress tends to concentrate at a pressing mark applied at that time is suppressed. Can be obtained. In addition, in anticipation of suppressing a decrease in cable strength, it is possible to reduce the material cost by reducing the thickness of the cable including the conductor.

Further, in the cable joined body of the present invention, the other portion of the pressing mark is composed of a plurality of the dot marks arranged linearly in the length direction of the cable and arranged in a plurality of rows in the width direction. It is preferable that the nearest part of the pressing mark is formed of a smaller number of the point marks than the number of the point marks arranged in the width direction of the other portions .

According to this preferred cable joined body, by reducing the number of rows of point- like marks in the most recent part of the pressing mark, the proportion of the cable in the width direction at that part can be easily suppressed, and the cable strength is reduced. Can be suppressed.

Further, in this preferred cable joined body, it is more preferable that the number of the dot marks in the nearest part is smaller than the number of arrangements of the dot marks in the other part in the length direction .

  According to this more preferable cable joined body, the area at the most recent portion of the pressing mark can be effectively suppressed, so that the decrease in the cable strength at that portion can be more effectively suppressed.

Further, in order to solve the above problem, an ultrasonic bonding apparatus of the present invention includes a cable, and a metal bonding target in which a conductor of the cable is electrically and mechanically bonded by ultrasonic bonding. An ultrasonic joining apparatus used for producing a cable joined body, wherein the joining object is placed, and a joining cable portion joined by the ultrasonic joining with the joining object in the cable is attached to the joining object. The anvil to be stacked and the anvil are pressed against the joining cable portion with the joining object and the joining cable portion interposed therebetween, and are ultrasonically vibrated to form a concave dot-like mark on the joining cable portion. the provided a horn for bonding the bonding cable portion while leaving a pressure mark on the bonding target that more chromatic, and the horn is pressed against the bonding cable portion Includes a Pushing unit for a plurality have a knurl peaks projecting ridge leaving the point-trace, the in the width direction of the cable at the junction cable section when the portion Te the pressing is pressed against the bonding cable portion The ratio of the sum of the lengths of the knurls to the length of the cable in the width direction is the most in the pressing portion, in the extended cable portion extending from the joint cable portion in the jointed cable after the joint. recently pushing portion pressed against the close position, the pressing rather smaller than the portion Te other pressing the portion Te, between the knurls mountain in the knurls mountain and partial Te said other pressing in portions Te the recent pressing, the width The forming positions in the directions are shifted from each other .

  In the ultrasonic bonding apparatus of the present invention, in the pressing portion that leaves a pressing mark on the bonding cable portion, the above-described other pressing that occupies a relatively large proportion in the width direction of the cable when pressed against the bonding cable portion The portions ensure good bonding strength by ultrasonic bonding. On the other hand, in the pressing portion, the ratio of the recently pressed portion pressed to the position closest to the extended cable portion where the stress tends to concentrate in the cable joint is suppressed to be smaller than the ratio of the other pressed portions. I have. This suppresses a decrease in cable strength at a location where stress tends to concentrate at a pressing mark by the pressing portion. As described above, according to the present invention, a cable joint body in which a decrease in cable strength in a portion where stress tends to be concentrated in a pressing mark applied at that time is suppressed while obtaining good bonding strength by ultrasonic bonding Can be obtained. In addition, in anticipation of suppressing a decrease in cable strength, it is possible to reduce the material cost by reducing the thickness of the cable including the conductor.

Further, in the ultrasonic bonding apparatus of the present invention, the other pressing portion is linearly arranged in a length direction of the cable when pressed against the bonding cable portion and is arranged in a plurality of rows in the width direction. It is preferable that the plurality of knurls are provided and the latest pressed portion is formed of a smaller number of the knurls than the number of the other pressed portions arranged in the width direction in the knurl .

According to this preferred ultrasonic bonding apparatus, by reducing the number of rows of dot marks at the recently pressed portion, the ratio of the cable in the width direction of the cable can be easily suppressed, and the strength of the cable due to the pressing of the portion can be reduced. The decrease can be effectively suppressed.

Further, in this preferable ultrasonic bonding apparatus, it is more preferable that the number of the knurls in the most recent pressing portion is smaller than the number of the knurls in the length direction in the knurls of the other pressing portions. .

  According to this more preferable cable joined body, the area at the recently pressed portion can be effectively suppressed, so that a decrease in cable strength due to the pressed portion can be more effectively suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the cable joined body in which the fall of the mechanical cable strength in the joining part by ultrasonic joining was suppressed can be obtained.

It is a schematic diagram which shows the cable joined body concerning one Embodiment of this invention. FIG. 2 is a perspective view of a state in which a joining cable portion is joined to a cable mounting portion of the metal terminal shown in FIG. 1 as viewed from the joining cable portion side. FIG. 5 is a sectional perspective view taken along a cutting line V11-V11 in FIG. 2. FIG. 4 is a perspective view similar to FIG. 2, showing a comparative example for comparison with the cable joined body shown in FIGS. 1 to 3. It is a schematic diagram which shows one Embodiment of the ultrasonic bonding apparatus of this invention. FIG. 6 is a perspective view showing an uneven structure on the anvil side in each tip of the horn shown in FIG. 5. FIG. 7 is a schematic diagram illustrating a state in which the cable bonded body illustrated in FIGS. 1 to 3 is manufactured using the ultrasonic bonding device illustrated in FIGS. 5 and 6. FIG. 8 is a perspective view similar to FIG. 6, showing a comparative example for comparison with the ultrasonic bonding apparatus shown in FIGS. 5 to 7.

  Hereinafter, an embodiment of a cable joined body and an ultrasonic joining apparatus of the present invention will be described. First, an embodiment of the cable joined body of the present invention will be described.

  FIG. 1 is a schematic diagram showing a cable joined body according to one embodiment of the present invention. The cable joined body 1 shown in FIG. 1 includes a flat cable 110 and four metal terminals 120.

  The flat cable 110 is formed by covering four conductors 111 arranged in parallel in the width direction D11 with a thin resin coating 112. In the present embodiment, each of the conductors 111 is formed in a thin strip of copper with a thickness of about 0.1 mm. At one end of the flat cable 110, a cut 112a is provided in the resin coating 112 between the conductors 111. Thereby, four strip-shaped cable end portions 110a each including one conductor 111 are formed on one end side of the flat cable 110. Then, one cable end portion 110a is joined to one metal terminal 120.

  The metal terminal 120 is a copper bonding target in which the conductors 111 of the four cable end portions 110a are electrically and mechanically bonded by ultrasonic bonding. In the present embodiment, a pin terminal (not shown) is used. Is a socket terminal to be inserted. The metal terminal 120 includes a box-shaped socket portion 121 into which a pin terminal is inserted, and a cable mounting portion 122 to which the cable end portion 110a is overlapped and joined.

  In the flat cable 110 described above, in the length direction D12, the distal end portion of each cable end portion 110a is overlapped with the cable mounting portion 122 of the metal terminal 120, and is joined to the joined cable portion 110b by ultrasonic joining. Has become. Then, an extension cable portion 110c extends from the joint cable portion 110b to a side opposite to the metal terminal 120.

  FIG. 2 is a perspective view of a state in which the joining cable portion is joined to the cable mounting portion of the metal terminal shown in FIG. 1 as viewed from the joining cable portion side. FIG. 3 is a sectional perspective view taken along the line V11-V11 in FIG.

  As shown in FIG. 2, the joint cable portion 110b of the flat cable 110 is overlapped and joined to the cable mounting portion 122 of the metal terminal 120, and the extension cable portion 110c extends from the joint cable portion 110b. Is out.

  The joint cable portion 110b has a concave pressing mark 130 formed by pressing during ultrasonic bonding. The pressing mark 130 is formed of a group of a plurality of point-like marks 130a, each of which is recessed from the surface of the resin coating 112 in a shape of an inverted square truncated cone. As shown in FIG. 3, in each point mark 130 a, the internal conductor 111 is deformed into a shape protruding through the resin coating 112 on the cable mounting portion 122 side and protruding until it comes into contact with the cable mounting portion 122. ing. The bottom of the deformation and the cable mounting portion 122 form a solid-phase bonding portion 130a-1 by ultrasonic bonding. The ultrasonic bonding will be described later in detail.

  The pressing trace 130 composed of a collection of such point-like traces 130a includes, in the longitudinal direction D12 of the flat cable 110 (hereinafter, simply referred to as the longitudinal direction D12), a nearest portion 131 closest to the extended cable portion 110c; And another part 132.

  In the present embodiment, the other portion 132 of the pressing trace 130 is composed of two rows of traces 132a arranged in the width direction D11 of the flat cable 110 (hereinafter, simply referred to as the width direction D11). Each row-like mark 132a has a plurality of point-like marks 130a arranged linearly in the length direction D12. In the other portion 132, the ratio% 12 of the joint cable portion 110b in the width direction D11 is twice (2 ×% 11) the ratio% 11 of one dot mark 130a in the width direction D11.

  On the other hand, the nearest part 131 of the pressing mark 130 is composed of only one point mark 130a. In the most recent portion 131, the single dot-like mark 130a is provided substantially at the center of the cable end portion 110a in the width direction D11. In the present embodiment, the single dot mark 130a corresponds to an example of the “row mark having a smaller number of rows than a plurality of row marks” in the present invention.

  The ratio of the closest portion 131 in the width direction D11 in the joint cable portion 110b is the ratio% 11 of the single dot mark 130a in the width direction D11. That is, regarding the ratio of the joint cable portion 110b in the width direction D11, the ratio% 11 of the closest portion 131 of the pressing trace 130 closest to the extended cable portion 110c is smaller than the ratio% 12 of the other portion 132. .

  In the cable joined body 1 of the present embodiment described above, in the pressing mark 130, the other portion 132 occupying a relatively large percentage 12 in the width direction D11 ensures good joining strength by ultrasonic joining. Is done. On the other hand, in the pressing mark 130, the ratio% 11 of the nearest portion 131 closest to the extension cable portion 110c is suppressed to be smaller than the ratio% 12 of the other portion 132.

  FIG. 4 is a perspective view similar to FIG. 2 showing a comparative example for comparison with the cable joined body shown in FIGS. In FIG. 4, components equivalent to those shown in FIG. 2 are denoted by the same reference numerals as in FIG.

  In the comparative example shown in FIG. 4, at the cable end portion 110a of the flat cable 110, the joining cable portion 110b joined to the cable mounting portion 122 of the metal terminal 120 is ultrasonically joined as follows. A pressing mark 130 'is formed. The pressing mark 130 'in this comparative example is a set of a plurality of point-like marks 130a arranged in a 2x7 rectangular shape in the width direction D11 x the length direction D12. Then, regardless of the distance from the extension cable portion 110c, the ratio% 12 of the pressing mark 130 'in the width direction is twice (2) the ratio% 11 of the single dot mark 130a in the width direction D11. ×% 11).

  For this reason, in this comparative example, even when the extension cable portion 110c is pulled or bent, the stress tends to concentrate on the portion near the extension cable portion 110c. 110 is thin and the strength is low. In this comparative example, the thickness of the flat cable 110 including the conductor 111 is increased in anticipation of such a decrease in strength, and as a result, the material cost is increased.

  On the other hand, in the present embodiment shown in FIG. 2, the ratio% 11 of the closest portion 131 closest to the extension cable portion 110c in the width direction D11 is the ratio% 12 of the other portion 132 as described above. Almost half. As a result, a decrease in cable strength is suppressed for the above-described nearest portion 131 where stress tends to concentrate at the pressing mark 130. As described above, the cable joined body 1 of the present embodiment has good joint strength by ultrasonic joining, but also has a cable strength at the nearest portion 131 where stress tends to concentrate at the pressing mark 130 applied at that time. Is suppressed. In addition, in anticipation of suppressing a decrease in cable strength, in the present embodiment, the thickness of the flat cable 110 including the conductor 111 is originally reduced to reduce the material cost.

  Further, in the cable joined body 1 of the present embodiment, the other portion 132 of the pressing trace 130 is composed of the row-like traces 132a arranged in two rows in the width direction D11, and the most recent portion 131 is formed of the row-like traces 132a. Also consists of one dot-like mark 130a as a row-like mark with a small number of rows. That is, since the number of rows of the row-like marks in the nearest portion 131 in the pressing mark 130 is suppressed to a small number, the ratio% 11 of the portion in the width direction D11 is easily suppressed, and the decrease in the cable strength is effectively suppressed. Have been.

  Further, in the cable joined body 1 of the present embodiment, the row-like traces 132a in the other portion 132 are composed of a plurality of dot-like traces 130a arranged in the length direction D11, and the nearest portion 131 has one dot as described above. It consists of a trace 130a. As a result, the area of the pressing mark 130 at the nearest portion 131 is effectively suppressed, so that a decrease in the cable strength at that portion is more effectively suppressed.

  The above-described cable joined body 1 of the present embodiment is manufactured using an embodiment of the ultrasonic joining apparatus of the present invention described below.

  FIG. 5 is a schematic diagram showing one embodiment of the ultrasonic bonding apparatus of the present invention. In the ultrasonic bonding apparatus 2 shown in FIG. 5, the conductors 111 of the four cable end portions 110a of the flat cable 110 shown in FIG. This is a device for ultrasonic bonding. The ultrasonic bonding apparatus 2 includes an anvil 210 and a horn 220.

  The anvil 210 has a mounting surface 211 large enough for the four metal terminals 120 to be mounted. The mounting surface 211 is roughened to grip the mounted metal terminal 120 and suppress its movement. The anvil 210 is also provided with a not-shown holding member for suppressing the movement of each metal terminal 120 during ultrasonic bonding. The joint cable portion 110b of each cable end portion 110a is overlaid on the cable placement portion 122 of each metal terminal 120 placed on the anvil 210. The extension cable portion 110c extends from the joining cable portion 110b to the outside of the ultrasonic joining device 2.

  The horn 220 has four cable mounting portions 122 of the four metal terminals 120 and four connection terminal portions 110b of the four cable end portions 110a between the anvil 210 and the four connection terminal portions 110b. It has a tip 221. When the horn 220 having the tip 221 vibrates ultrasonically, the conductor 111 of each joint cable portion 110b is joined to the cable placing portion 122. At this time, on the anvil 210 side of each tip chip 221, an uneven structure is formed that joins the conductor 111 to the cable mounting portion 122 in the pressing trace 130 while leaving the pressing trace 130 in the joining cable portion 110 b.

  FIG. 6 is a perspective view showing an uneven structure on the anvil side of each tip of the horn shown in FIG. FIG. 6A shows the horn 220 with the four tips 221 facing upward, and FIG. 6B shows the uneven structure of one tip 221 in FIG. ) Is shown in an enlarged view of the region Ar1.

  On the anvil 210 side of the tip 221, there is provided a protruding pressing portion 222 which is pressed against the joint cable portion 110 b and leaves a pressing mark 130. The pressing portion 222 is formed of a set of a plurality of knurls 223, each of which protrudes in the shape of a square truncated cone.

  The pressing portion 222 formed of a set of such knurls 223 includes a recently pressed portion 222a pressed to a position closest to the extended cable portion 110c when pressed against the joint cable portion 110b, and another pressed portion. 222b.

  In the present embodiment, the other pressing portion 222b of the pressing portion 222 has two rows arranged in the width direction D11 (hereinafter, simply referred to as the width direction D11) of the flat cable 110 when pressed against the joint cable portion 110b. It consists of a projection 222c. Each row projection 222c is composed of a plurality of knurls 223 linearly arranged in the length direction D12 of the flat cable 110 (hereinafter, simply referred to as the length direction D12) when pressed against the joint cable portion 110b. In addition, when pressed against the joint cable portion 110b, the ratio% 22 of the joint cable portion 110b in the width direction D11 in the joint cable portion 110b is the ratio% 21 of one knurl 223 in the width direction D11. (2 ×% 21).

  On the other hand, the most recent pressing portion 222 a of the pressing portion 222 is simply composed of one knurl 223. In the recently pressed portion 222a, the single knurl 223 is provided so as to be pressed substantially at the center of the cable end portion 110a in the width direction D11. In the present embodiment, the one knurl 223 corresponds to an example of the “row projection having a smaller number of rows than a plurality of rows” in the present invention.

  The ratio of the recent pressing portion 222a in the width direction D11 in the bonding cable portion 110b when pressed against the bonding cable portion 110b is the same as the ratio% 21 in which one knurl 223 occupies in the width direction D11. Become. That is, the ratio% 21 of the recently pressed portion 222a is larger than the ratio% 22 of the other pressed portion 222b in the ratio occupied in the width direction D11 in the bonded cable portion 110b when pressed against the bonded cable portion 110b. Is also getting smaller.

  FIG. 7 is a schematic view showing a state in which the cable joined body shown in FIGS. 1 to 3 is manufactured using the ultrasonic joining apparatus shown in FIGS. 5 and 6.

  First, as described above, the four metal terminals 120 and the joint cable portions 110b of the four cable end portions 110a of the flat cable 110 are set on the anvil 210. Then, as the horn 220 descends in the direction of the arrow D21, the horn 220 (that is, the knurl 223 of each tip 221) starts ultrasonic vibration in the direction of the arrow D22 along the length direction D11 of the flat cable 110. (Step S1).

  Eventually, the knurl 223 that is ultrasonically vibrating comes into contact with the resin coating 112 on the horn 220 side of the joint cable portion 110b. Then, the resin coating 112 on the horn 220 side is removed by the frictional heat generated between the knurl 223 and the resin coating 112 and the movement of the knurl 223 (step S2). Further, at this stage, the vibration of the knurl 223 is transmitted to the joint cable portion 110b, and the joint cable portion 110b also performs ultrasonic vibration in the arrow D23 direction along the length direction D11. At this time, the vibration of the knurl 223 and the vibration of the joint cable portion 110b are not necessarily synchronized with each other, and each vibrate independently. When the horn 220 further descends in the direction of arrow D21 while removing the resin coating 112 at the knurl 223 and comes into contact with the internal conductor 111, the horn 220 and the conductor 111 vibrate independently. Generates frictional heat. This frictional heat is transmitted to the resin coating 112 on the cable mounting portion 122 side of the metal terminal 120 and softens the resin coating 112.

  Further, when the horn 220 descends in the direction of the arrow D21, the conductor 111 is pressed toward the cable placing portion 122 by the pressure drop, and is deformed so as to protrude toward the cable placing portion 122 (step S3). The conductor 111 deformed in this way breaks through the resin coating 112 softened by the frictional heat as described above and comes into contact with the cable mounting portion 122. At this time, since the conductor 111 is ultrasonically vibrated, at the stage where the conductor 111 comes into contact with the cable mounting portion 122, the oxide film of the contacted portion is removed, and each new surface appears. The new surfaces are joined together by the attractive force between the constituent metal atoms to form a solid-phase bond. By this solid-phase joining, the cable mounting portion 122 of the metal terminal 120 and the joining cable portion 110b of the flat cable 110 are joined, and the cable joined body 1 is completed. A pressing mark 130 shown in FIG. 2 is left on the joint cable portion 110b in the completed cable joint body 1.

  In the ultrasonic bonding apparatus 2 of the present embodiment described above, in the pressing portion 222 that leaves the pressing mark 130 on the bonding cable portion 110b, the width of the other pressing portion 222b when the pressing portion 222b is pressed against the bonding cable portion 110b. It occupies a relatively large percentage 22 in the direction D11. In addition, good electrical bonding by ultrasonic bonding is ensured by the pressing portion 222b. On the other hand, in the pressing portion 222, the percentage 21 of the recently pressed portion 222a pressed to the position closest to the extended cable portion 110c where the stress tends to concentrate in the cable joint 1 is the percentage% of the other pressed portion 222b. It is kept smaller than 22.

  FIG. 8 is a perspective view similar to FIG. 6, showing a comparative example for comparison with the ultrasonic bonding apparatus shown in FIGS. FIG. 8A shows the horn 220 ′ of the comparative example with the four tips 221 ′ facing upward, and FIG. 8B shows the uneven structure of one tip 221 ′. Is shown in an enlarged view of the region Ar2 in FIG. Note that, in FIG. 8, the same components as those shown in FIG. 6 are denoted by the same reference numerals as those in FIG.

  In the comparative example shown in FIG. 8, one pressing portion 222 'is formed on one tip 221'. The pressing portion 222 ′ in this comparative example has the same knurl 223 as that shown in FIG. 6 arranged in a 2 × 7 rectangular shape in the width direction D11 × length direction D12. I have. In the pressing portion 222 ', the ratio% 22 occupying the width direction D11 when pressed against the joint cable portion 110b over substantially the entire range in the length direction D12, and the ratio occupying each knurl mountain 223. (2 × d21). In this comparative example, a pressing mark 130 'of the comparative example shown in FIG. 4 is left in the joint cable portion of the completed cable joint. As described above, in the pressing trace 130 'of this comparative example, the flat cable 110 is thinned at the same ratio as the other portions even in the portion near the extended cable portion 110c where the stress tends to concentrate, and the strength is reduced. Will decrease. In this comparative example, the thickness of the flat cable 110 including the conductor 111 is increased in anticipation of such a decrease in strength, and as a result, the material cost is increased.

  On the other hand, in the ultrasonic bonding apparatus 2 of the present embodiment, the ratio% 21 of the latest pressed portion 222a pressed to the position closest to the extension cable portion 110c in the width direction D11 is different from the other pressed portion as described above. It is suppressed to approximately half of the ratio% 22 of the contact portion 222b. This suppresses a decrease in cable strength at a location where stress tends to concentrate in the pressing mark 130 by the pressing portion 222. As described above, according to the ultrasonic bonding apparatus 2 of the present embodiment, the cable strength at a location where stress tends to concentrate on the pressing mark 130 applied at that time while obtaining good electrical bonding by ultrasonic bonding. Can be obtained. Further, as described above, in anticipation of suppressing a decrease in cable strength, in the present embodiment, the thickness of the flat cable 110 including the conductor 111 is originally reduced to reduce the material cost.

  Further, in the ultrasonic bonding apparatus 2 of the present embodiment, the other pressing portion 222b includes two row projections 222c arranged in the width direction D11 when pressed against the bonding cable portion 110b. On the other hand, the recently pressed portion 222a includes one knurl 223 as a row projection having a smaller number of rows than those row projections 222c. That is, since the number of rows of the row projections in the recent pressing portion 222a of the pressing portion 222 is suppressed to a small value, the ratio% 21 of the portion in the width direction D11 can be easily suppressed, and the pressing of the portion can be reduced. A decrease in cable strength is effectively suppressed.

  Further, in the ultrasonic bonding apparatus 2 of the present embodiment, the row projections 222c in the other pressing portion 222b include a plurality of knurls 223 arranged in the length direction D12 when pressed against the bonding cable portion 110b. On the other hand, the recently pressed portion 222a is formed of one knurl 223 as described above. As a result, the area of the recently pressed portion 222a is effectively suppressed, so that a decrease in cable strength due to the pressing of that portion is more effectively suppressed.

  The embodiment described above merely shows a typical mode of the present invention, and the present invention is not limited to this embodiment. That is, various modifications can be made without departing from the gist of the present invention. As long as the structure of the cable joined body and the ultrasonic joining apparatus of the present invention is provided even by such a modification, it is of course included in the scope of the present invention.

  For example, in the embodiment described above, the metal terminal 120 is illustrated as an example of the joining target according to the present invention. However, the object to be joined according to the present invention is not limited to this, and does not matter the specific mode as long as it is a metal member that can be joined to the cable by ultrasonic joining.

  In the above-described embodiment, the flat cable 110 including four conductors 111 is illustrated as an example of the cable according to the present invention. However, the object to be joined according to the present invention is not limited to this, and does not matter the specific mode as long as it is a cable that can be joined by ultrasonic joining to a metal object to be joined.

  Further, in the above-described embodiment, as an example of the pressing scar according to the present invention, the other part 132 in which the row-like scratches 132a of the plurality of dot-like scratches 130a are arranged in two rows, and one dot-like scar 130a. A pressing trace 130 having a recent portion 131 is illustrated. However, the pressing mark referred to in the present invention is not limited to this. The press mark referred to in the present invention does not ask about the specific aspect of the ratio in the width direction of the cable, as long as the ratio of the nearest portion closest to the extended cable portion is smaller than the ratio of the other portions. Absent.

  Further, in the above-described embodiment, as an example of the pressing portion according to the present invention, the other pressing portion 222b in which the row projections 222b of the plurality of knurls 223 are arranged in two rows, and one knurl 223a. The pressing portion 222 having the recent pressing portion 222a is illustrated. However, the pressing portion according to the present invention is not limited to this. The pressing portion according to the present invention is such that the ratio of the recently pressed portion pressed to the position closest to the extended cable portion is smaller than the ratio of the other pressed portions with respect to the ratio occupied in the width direction when pressed against the joint cable portion. If it is also small, it does not matter the specific mode.

DESCRIPTION OF SYMBOLS 1 Cable joining body 2 Ultrasonic joining apparatus 110 Flat cable 110a Cable end part 110b Joining cable part 110c Extension cable part 111 Conductor 112 Resin coating 120 Metal terminal (an example of an object to be joined)
130 Press mark 130a Point mark 131 Nearest part 132 Other part 132a Row mark 210 Anvil 220 Horn 221 Tip tip 222 Pressing part 222a Recent pressing part 222b Other pressing part 222c Row projection 223 Knurl mountain D11 Width direction D12 Length Direction% 11,% 12,% 21,% 22 Ratio in width direction

Claims (6)

A cable joint having a cable and a metal joining object in which a conductor of the cable is electrically and mechanically joined by ultrasonic joining,
The cable has a joining cable portion that is placed on the joining object and joined by the ultrasonic joining, and an extending cable portion extending from the joining cable portion,
A pressing mark having a plurality of concave point marks formed by pressing at the time of the ultrasonic bonding is formed on the bonding cable portion,
The sum of the lengths of the point-trace in the width direction before Symbol cable, the ratio to the length of the cable in the width direction is closest recent part on the extending cable portion in the press marks, the pressing mark rather smaller than the other part in,
The cable joint according to claim 1, wherein the formation positions in the width direction are shifted from each other in the dot marks in the nearest part and the dot marks in the other part . The other portion of the pressing mark is composed of a plurality of point-like marks arranged linearly in the length direction of the cable and arranged in a plurality of rows in the width direction ,
2. The cable joint according to claim 1, wherein the most recent portion of the pressing trace includes a smaller number of the dot traces in the width direction than the other portion of the dot traces . 3. 3. The cable joint according to claim 2 , wherein the number of the dot marks in the nearest portion is smaller than the number of the dot marks in the other portion in the length direction . 4. An ultrasonic joining apparatus used for producing a cable joined body having a cable and a metal joining object in which a conductor of the cable is electrically and mechanically joined by ultrasonic joining,
An anvil on which the object to be joined is placed, and in the cable, a joint cable portion joined by the ultrasonic joining with the object to be joined is placed on the object to be joined,
The object to be joined and the joint cable portion are sandwiched between the anvil and the joint cable portion, and are pressed and ultrasonically vibrated to leave a press mark having a plurality of concave point marks on the joint cable portion. A horn for joining the joining cable portion to the joining object while
The horn includes a pressing portion having a plurality of projecting knurls that are pressed against the joint cable portion and leave the point marks ,
The ratio of the sum of the lengths of the knurls in the width direction of the cable in the joint cable portion when the pressing portion is pressed against the joint cable portion, relative to the length of the cable in the width direction , In the pressing portion, a recently pressed portion pressed to a position closest to an extended cable portion extending from the bonded cable portion in the cable joined body after the bonding is different from other pressed portions in the pressed portion. also rather small,
The ultrasonic bonding apparatus according to claim 1, wherein the formation positions in the width direction are shifted from each other in the knurl mountain in the most recent pressing portion and the knurl mountain in the other pressing portion . The other pressing portion is composed of a plurality of knurls arranged linearly in the length direction of the cable when pressed against the joining cable portion and arranged in a plurality of rows in the width direction ,
5. The ultrasonic bonding apparatus according to claim 4, wherein the most recent pressing portion is formed of a smaller number of the knurls than the other pressing portions in the width direction of the knurls in the knurl . 6. The ultrasonic bonding apparatus according to claim 5 , wherein the number of the knurls of the recently pressed portion is smaller than the number of the knurls arranged in the length direction of the other pressed portion in the length direction .

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