JP2019169316A - Flexible cable, connector structure, and manufacturing method thereof - Google Patents

Abstract

To provide a flexible cable capable of easily determining quality of solder conjugation state between a connector and wiring, a connector structure, and a manufacturing method therefor.SOLUTION: A flexible cable 3 has flexibility, and wiring 30 in which at least connection parts 30C (30C1 to 30Cn) extend on a surface of a resin-made film having insulation property with a constant wiring width dimension. In the connection parts 30C, penetration parts 35 and 36 penetrating the wiring 30 in a thickness direction are provided. The penetration parts 35 and 36 are used as observation parts for observing solder wetting up state at a solder conjugation part of the connection parts 30C and a second contact part 21B of the connector 2.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a flexible cable, a connector structure, and a manufacturing method thereof. In particular, the present invention relates to a flexible cable, a connector structure in which the flexible cable and a connector are connected, and a technique effective when applied to a manufacturing method of the connector structure.

  Patent Document 1 listed below discloses an FPC / FFC connector. This connector includes a contact group supported by an insulator. Wiring groups of flexible cables such as a flexible printed circuit board (FPC) and a flexible flat cable (FFC) are electrically connected to the connectors. The connector is configured such that each contact sandwiches each wiring in a state where each contact of the contact group and each wiring of the wiring group are in contact with each other. Thereby, in the connector, the flexible cable is held by the insulator.

JP-A-11-307195

  Here, for the purpose of improving the electrical connection state between the contact group of the insulator and the wiring group of the flexible cable, and further mass production, the contact group and the wiring group are collectively used by solder bonding. Development of a connector structure and a manufacturing method for electrical connection are desired. In manufacturing a connector structure that employs solder bonding, first, a solder paste is formed on each contact group of the connector, and a wiring group is arranged on each contact group via the solder paste. Next, when the electric soldering iron comes into contact with the wiring group and heat is applied from the electric soldering iron through the wiring group to the solder paste, the solder paste is melted. The electric soldering iron is energized for several seconds, for example. When the energization is released, the solder paste is cooled, and solder for connecting the contact group and the wiring group is formed from the solder paste.

In the manufacture of the connector structure employing the above solder joint, after the solder is formed, the solder wetting state (side fillet) on the side wall of the wiring is observed (inspected) by, for example, visual observation or image recognition processing. The quality of the state is determined. Specifically, if the side fillet is good, it is determined that the solder joint state is good, and if the side fillet is not good, it is determined that the solder joint state is not good.
However, when the line and space of the contact group and the wiring group is miniaturized and the arrangement pitch of the contact group and the wiring group is miniaturized to 2 mm to 3 mm, for example, the space is set to 1 mm or less, for example. In addition, the contact width dimension and the wiring width dimension may be set to the same dimension. For this reason, it is difficult to observe the solder wetting state in a fine space and determine the quality of the solder joint state, so there is room for improvement in the flexible cable, connector structure, and manufacturing method thereof.

  In consideration of the above facts, the present invention provides a flexible cable, a connector structure, and a method for manufacturing the connector structure that can easily determine whether the soldering state between the connector and the wiring is good.

  The flexible cable according to the first embodiment of the present invention has a flexible and insulating resin film, and at least one connection portion on one surface of the film has a constant wiring width dimension. A conductive line extending in the direction of the wiring, and a penetrating portion disposed in the connecting portion and penetrating in the thickness direction of the wiring.

  The flexible cable according to the first embodiment includes a film and a wiring. The film is made of a resin having flexibility and insulating properties. The wiring extends on one surface of the film and has conductivity. At least a connection portion of the wiring is formed with a certain wiring width dimension.

  Here, the flexible cable includes a through portion. The penetrating portion is disposed at a connection portion of the wiring and penetrates in the thickness direction of the wiring. For this reason, since a penetration part can be used as an observation part (or test | inspection part to test | inspect) which observes the wetting-up state (side fillet) of a solder, the quality of a solder joint state can be determined easily.

  In the flexible cable according to the second embodiment of the present invention, the flexible cable according to the first embodiment is made of a resin having flexibility and insulation on one surface of the film. A protective film is provided with the wiring interposed therebetween, and the connection part is formed by removing a part of the film and the protective film and exposing the surface of the wiring.

  According to the flexible cable which concerns on a 2nd embodiment, a protective film is provided by interposing wiring on one surface of a film. The protective film is made of a resin having flexibility and insulating properties. And a connection site | part is formed by removing a part of film and a protective film and exposing the surface of wiring. For this reason, since all surfaces of the front surface, the back surface, and the side surfaces are exposed at the connection portion of the wiring, it is possible to ensure sufficient solder wettability at the connection portion when performing the solder bonding.

  In the flexible cable which concerns on the 3rd embodiment of this invention, in the flexible cable which concerns on a 1st embodiment or a 2nd embodiment, a penetration part is a width direction one end part of a wiring in a connection part, and a width direction both ends. Or in the middle in the width direction.

  According to the flexible cable according to the third embodiment, since the through portion is disposed at one end in the width direction, both ends in the width direction, or the middle portion in the width direction at the connection site, for example, the thickness of the wiring It is set at a position where it can be easily observed when viewed from the direction. For this reason, when a penetration part is used as an observation part which observes the side fillet of solder, the quality of a solder joint state can be judged easily.

  In the flexible cable according to the fourth embodiment of the present invention, in the flexible cable according to the third embodiment, the width direction one end portion of the wiring or the through portion disposed at both width direction end portions is the thickness of the wiring. When viewed from the side, the through-hole formed in the semi-circular, U-shaped, or semi-elliptical cut-out and disposed in the middle in the width direction of the wiring is circular when viewed from the thickness direction of the wiring. These are formed as elliptical or elongated through-holes.

  According to the flexible cable according to the fourth embodiment, the through portion disposed at one end portion in the width direction of the wiring or both end portions in the width direction is formed as a notch portion, and is disposed in the middle portion in the width direction of the wiring. The through portion is formed as a through hole. The notch is semicircular, U-shaped or semi-elliptical. The through hole has a circular shape, an elliptical shape, or a long hole shape. Each of the notch and the through hole has an arc shape when viewed from the thickness direction of the wiring, and has a shape in which stress concentration is less likely to occur compared to a square shape. For this reason, generation | occurrence | production of a disconnection in the connection part of wiring can be suppressed or prevented effectively.

  A connector structure according to a fifth embodiment of the present invention includes a flexible and insulating resin film, and at least a connection portion on one surface of the film extending with a certain wiring width dimension. A flexible cable including a conductive wiring provided, a penetrating portion disposed in a connection portion and penetrating in a thickness direction of the wiring, an insulating housing, and a housing And a lead wiring having a first contact portion at one end and a second contact portion formed at the other end with the same contact width dimension as the wiring width dimension of the connection portion. A connector that is disposed between the second contact portion and the connection portion, electrically and mechanically connects the second contact portion and the connection portion, and a side fillet can be observed in the penetration portion; It has.

The connector structure according to the fifth embodiment includes a flexible cable and a connector.
The flexible cable includes a film and wiring. The film is made of a resin having flexibility and insulating properties. The wiring extends on one surface of the film and has conductivity. At least a connection portion of the wiring is formed with a certain wiring width dimension.
On the other hand, the connector includes a housing and lead wiring. The housing has an insulating property. The lead wiring is disposed on the housing. One end portion of the lead wiring has a first contact portion. The other end portion of the lead wiring has a second contact portion, and the second contact portion is formed to have the same contact width dimension as the wiring width dimension of the connection portion of the wiring.

Here, the connector structure includes a penetrating portion at a connection portion of the wiring in the flexible cable, and includes solder between the second contact portion and the connection portion of the connector. The penetrating portion is disposed at the connection site and penetrates in the thickness direction of the wiring. The solder electrically and mechanically connects the second contact portion and the connection portion, and the side fillet can be observed in the penetrating portion.
For this reason, by observing the solder side fillet at the penetrating portion, it is possible to easily determine whether the solder contact state between the second contact portion and the connection site, that is, the solder joint state between the connector lead wiring and the flexible cable wiring, is good or bad. Can be determined.

  According to a sixth aspect of the present invention, there is provided a method for manufacturing a connector structure, comprising: a flexible and insulating resin film having at least a connecting portion extending with a certain wiring width dimension. A step of forming a penetrating portion penetrating in the thickness direction at a connecting portion of the flexible cable in which the conductive wiring provided is disposed; Forming a connector including a lead wire having a first contact portion and having a second contact portion formed at the other end portion with the same contact width dimension as that of the connection portion; A step of forming a solder paste on the two contact parts, a soldering paste interposed in the second contact part, and a connecting part disposed to electrically and mechanically connect the second contact part and the connecting part from the solder paste. Shape A step of, by observing the solder side fillet in the through portion, and a, a step of determining the quality of the solder joint.

In the manufacturing method of the connector structure according to the sixth embodiment, the through portion is formed at the connection portion of the flexible cable. In the flexible cable, a conductive wiring is disposed on one surface of a resin-made film having flexibility and insulating properties. At least the connection part of the wiring is formed with a certain wiring width dimension. A penetration part is formed in a connection part, and penetrates in the thickness direction.
On the other hand, the connector is configured to include a lead wire disposed in an insulating housing. One end portion of the lead wiring has a first contact portion. The other end portion of the lead wiring has a second contact portion, and the second contact portion is formed to have the same contact width dimension as the wiring width dimension of the connection portion.
And solder paste is formed in the 2nd contact part of a connector. Subsequently, a connection part is disposed with the solder paste interposed in the second contact portion, and solder for electrically and mechanically connecting the second connector and the connection part is formed from the solder paste. Thereafter, the quality of the solder joint is determined.

  Here, a penetration part is formed in the connection part of a flexible cable. Since the side fillet of the solder can be observed at the penetration portion, the quality of the solder joint can be easily determined in the method for manufacturing the connector structure.

  According to the present invention, it is possible to provide a flexible cable, a connector structure, and a method for manufacturing a connector structure, which can easily determine whether the solder joint state between the connector and the wiring is good or bad.

It is a top view which shows the connector structure which concerns on 1st Embodiment of this invention. It is a perspective view of the connector structure shown by FIG. It is a perspective view of the flexible cable which constructs the connector structure concerning a 1st embodiment shown in Drawing 1 and Drawing 2, and its connection part. It is the principal part enlarged plan view which expanded the principal part of the flexible cable shown by FIG. 3, and its connection part. It is the principal part expanded sectional view which expanded the principal part of the flexible cable shown by FIG. 4 (essential part expanded sectional view cut | disconnected in the AA line shown by FIG. 4). It is a perspective view corresponding to FIG. 2 of the connector (insulator) which builds the connector structure which concerns on 1st Embodiment shown by FIG.1 and FIG.2. 1A is a first process cross-sectional view for explaining the method of manufacturing the connector structure according to the first embodiment shown in FIGS. 1 and 2 (a cross-sectional view cut and enlarged along the line BB shown in FIG. 2); (B) is a second process cross-sectional view, and (C) is a third process cross-sectional view. (A) is an enlarged sectional view showing an enlarged side fillet of a good solder in the connector structure according to the first embodiment (enlarged sectional view cut and enlarged at the CC line shown in FIG. 4); FIG. 9B is an enlarged cross-sectional view showing an enlarged side fillet of unsatisfactory solder, and FIG. 8C is an enlarged cross-sectional view corresponding to FIG. 8A showing a connector structure according to a comparative example. (A) is the principal part enlarged plan view corresponding to FIG. 4 which shows the flexible cable which constructs the connector structure concerning a 2nd embodiment of the present invention, and its connection part, (B) is the 2nd embodiment. The principal part enlarged plan view which shows the flexible cable which concerns on a 1st modification, and its connection part, (C) is the principal part enlarged plan view which shows the flexible cable which concerns on a 2nd modification, and its connection part, (D ) Is an essential part enlarged plan view showing a flexible cable according to a third modification and its connection part, and (E) is an essential part enlarged plan view showing a flexible cable according to the fourth modification and its connection part. is there.

[First Embodiment]
A flexible cable, a connector structure, and a manufacturing method thereof according to the first embodiment of the present invention will be described with reference to FIGS. In the figure, the arrow X shown as appropriate indicates the X direction on the horizontal plane, the arrow Y indicates the Y direction orthogonal to the X direction on the horizontal plane, and the arrow Z indicates the X direction and the Z direction orthogonal to the Y direction. Yes. The X direction, Y direction, and Z direction coincide with the X axis direction, Y axis direction, and Z axis direction of the three-dimensional coordinate system, respectively. In addition, the application direction of a flexible cable, a connector structure, and its manufacturing method is not limited to this Embodiment.

(Configuration of connector structure)
As shown in FIGS. 1 and 2, the connector structure 1 according to the present embodiment is electrically and mechanically connected to the connector (insulator) 2 and the connector 2 to maintain this connection state. And the flexible cable 3. In the present embodiment, the flexible cable 3 is used as a part of a wire harness routed in a vehicle such as an automobile, and the connector 2 is a terminal for connecting the wire harness to electrically connect electronic components. It is used as

(1) Configuration of Flexible Cable 3 As shown in FIGS. 1 to 5, FFC (Flexible Flat Cable) is used for the flexible cable 3. As shown in FIG. 5, the flexible cable 3 is arranged on a flexible and insulating resin film 34 and one surface (the upper surface in FIG. 5) of the film 34. And a conductive wiring 30 provided.
Furthermore, the flexible cable 3 includes a protective film 32. The protective film 32 is provided on one surface of the film 34 with the wiring 30 interposed therebetween. The protective film 32 is made of a resin having flexibility and insulating properties.

  As the film 34, a film-like polyethylene terephthalate (PET) resin film in which the Y direction is the longitudinal direction and the X direction is the short direction is used. The film 34 is set to have a film thickness of 20 μm to 30 μm, for example, 25 μm.

For example, a copper foil is used as the wiring 30. The copper foil is set to a film thickness of 30 μm to 40 μm, for example, 35 μm here. The wiring 30 extends on one surface of the film 34 with the Y direction as the wiring long direction (longitudinal direction) and the X direction as the wiring width direction (short direction). Here, the wiring 30 is set to a constant wiring width dimension. The wiring width dimension of the wiring 30 is set to, for example, 1.0 mm to 2.0 mm, preferably 1.5 mm, and the inter-wiring space of the wiring 30 is set to, for example, 0.5 mm to 1.0 mm, preferably 0.8 mm. Yes. That is, the preferable line and space of the wiring 30 is set to 1.5 mm / 0.8 mm, and the arrangement pitch of the wiring 30 is set to 2.3 mm.
Although the number of wirings 30 is not limited, in the present embodiment, six wirings 30 are arranged in the X direction at the arrangement pitch, and each wiring 30 extends in the Y direction in parallel. Of course, for convenience of explanation, the wiring 30 is extended in the Y direction. However, since the flexible cable 3 has flexibility, it can be bent and extended in various directions.

  The wiring 30 is adhered to one surface of the film 34 by an adhesive layer 33. For example, a resin adhesive is used for the adhesive layer 33, and the thickness of the adhesive layer 33 is set to a thickness equivalent to that of the film 34, for example.

  On the other hand, the protective film 32 is made of the same material or substantially the same material as the film 34 and has the same configuration or substantially the same configuration. That is, the same or substantially the same film as the film 34 is used for the protective film 32. Then, one surface of the film 34 and one surface of the protective film 32 opposite to the one surface are bonded by an adhesive layer 31 with the wiring 30 interposed therebetween. The adhesive layer 31 is the same as the adhesive layer 33.

  As shown in FIGS. 1 to 4, the flexible cable 3 has connection portions 30 </ b> C <b> 1 to 30 </ b> Cn (n is a natural number including “0” at one end of the wiring 30. Here, n is set to “6”. Is provided). More specifically, for example, in FIG. 3, the wiring 30 arranged at the left end is provided with a connection part 30C1, and the wiring 30 adjacent to the right side from the left end is provided with a connection part 30C2. Further, the connection portion 30Cn is provided in the wiring 30 arranged at the right end, and the connection portion 30Cn-1 is provided in the wiring adjacent to the left side from the right end. Here, the connection parts 30C1 to 30Cn may be collectively referred to simply as “connection part 30C”.

The connection portion 30C is formed by partially removing the film 34, the adhesive layer 33, the adhesive layer 31, and the protective film 32 at one end of the flexible cable 3 to expose the front surface, back surface, and both side surfaces of the wiring 30. Has been. The wiring width dimension is set to be constant at least at the connection site 30C.
In the present embodiment, the wiring width dimension is set to be constant throughout the wiring length direction of the wiring 30 including the connection part 30C.

And in the flexible cable 3 which concerns on this Embodiment, as FIG. 1-4 shows, the penetration part 35 and the penetration part 36 are arrange | positioned in each of connection site | part 30C1-30Cn.
As shown in FIG. 4, the penetrating portion 35 is disposed at the end of the wiring 30 in the wiring length direction of the wiring 30 in the wiring width direction one end (left end) of the connection portion 30 </ b> C of the wiring 30. The penetrating portion 35 is formed in a semicircular shape recessed inward in the wiring width direction when viewed from the thickness direction (Z direction) of the wiring 30, and is formed so as to penetrate in the thickness direction of the wiring 30. That is, the wiring width dimension of the connection part 30C in which the penetration part 35 is disposed is smaller than the wiring width dimension of the connection part 30 (other part) in which the penetration part 35 (and the penetration part 36) is not disposed. Has been. The through portion 35 is formed between the connection portion 30C and a second contact portion 21B, which will be described later, of the connector 2, and the side fillet 40 of the solder 4 that electrically and mechanically connects both (see FIG. 8A). )) Or the side fillet 41 (see FIG. 8B) is used as an observation unit (inspection unit).
The penetration part 36 is disposed closer to the inner side than the penetration part 35 in the wiring length direction of the wiring 30 at the other end part (right end part) in the wiring width direction of the connection part 30C. The penetration part 36 is recessed inward in the wiring width direction, which is the opposite side to the penetration part 35 when viewed in the thickness direction of the wiring 30, and the penetration part 35 has a half line shape (or point object shape). It is formed in a circular shape and penetrates in the thickness direction of the wiring 30. The penetration part 36 is configured in the same manner as the penetration part 36 and is used as an observation part for observing the side fillet 40 or the side fillet 41 of the solder 4.

  When the other end of the flexible cable 3 (not shown) is connected to the connector in the same manner as the one end, a connection portion similar to the connection portion 30C is disposed at the other end of the wiring 30. A penetration portion similar to the penetration portion 35 and the penetration portion 36 is provided. When not connected to the connector or when the connection state is mechanically held while being electrically connected, the configuration of the other end of the flexible cable 3 may be different from the configuration of the one end.

(2) Configuration of Connector 2 As shown in FIGS. 1, 2, and 6, the connector 2 includes a housing 20 and lead wires 21.
The housing 20 has an insulating property, and is made of resin here. The housing 20 has an L-shape that extends in the X direction when viewed from the Z direction, and further extends in the Y direction from the extended end, and is thicker than the thickness of the flexible cable 3. It has a three-dimensional shape. The shape of the housing 20 is not limited to the L shape.

  As shown in FIG. 6 in particular, the lead wiring 21 is disposed in the housing 20, extends in the X direction along the L-shape of the housing 20, and further extends in the Y direction from the extended end. It is formed in an L shape. Here, six lead wires 21 are arranged in parallel, corresponding to the number of wires 30 arranged in the flexible cable 3.

  The lead wiring 21 has a first contact portion 21 </ b> A at one end on the left side extending in the X direction, and the first contact portion 21 </ b> A protrudes from the side surface of the housing 20 in the X direction. The contact width dimension in the Y direction of the first contact portion 21A is set to, for example, 0.5 mm to 0.7 mm, preferably 0.64 mm, and the thickness of the first contact portion 21A in the Z direction is the same as the contact width dimension. Is set. The arrangement pitch of the first contact portions 21A is set to, for example, 2.0 mm to 2.5 mm, preferably 2.2 mm. The first contact portion 21A is configured as a tab contact that is electrically connected to a reset contact contact, for example.

On the other hand, the lead wiring 21 has a second contact portion 21B at the other lower end portion extending in the Y direction, and a part of the second contact portion 21B protrudes from the side surface of the housing 20 in the Y direction. ing. The contact width dimension in the X direction of the second contact part 21B and the space between the adjacent second contact parts 21B, that is, the line and space are the same as the line and space of the connection part 30C of the wiring 30 of the flexible cable 3. Is set. The thickness of the second contact portion 21B is set to the same dimension as the thickness of the first contact portion 21A. Here, the same dimension is used in a sense that the same dimension and a dimension range including manufacturing variations in manufacturing are included.
The lead wiring 21 is integrally formed when the housing 20 is molded by resin molding. In the connector 2 shown in FIG. 6, the adjacent lead wires 21 are connected to each other on the first contact portion 21A side. However, when the housing 20 is resin-molded or after resin molding, FIG. As shown in FIG. 2, the lead wires 21 are separated from each other. The lead wiring 21 is made of, for example, a copper alloy material. Although a reference numeral and description are omitted in particular, a plating layer such as tin is provided on the surface layer of the lead wiring 21, and the solder wettability can be improved by providing the plating layer.

(3) Connection Structure of Connector 2 and Flexible Cable 3 As shown in FIGS. 1 and 2, in the connector structure 1 according to the present embodiment, a plurality of second contact portions 21B (second The contact portion group) and the plurality of connection portions 30C (wiring group) of the flexible cable 3 are electrically and mechanically connected to each other. Solder 4 (see FIG. 8A and the like) is used for connection.
The solder bonding method will be described in the manufacturing method of the connector structure 1.

(Manufacturing method of connector structure 1)
The manufacturing method of the connector structure 1 according to the present embodiment is as follows.
First, the flexible cable 3 shown in FIGS. 3 to 5 is formed. In particular, as shown in FIG. 5, the wiring 30 is formed on one surface of the film 34 with the adhesive layer 33 interposed therebetween, and the protective film 32 is further formed on the one surface of the film 34 with the wiring 30 and the adhesive layer 31 interposed therebetween. Are formed, and the flexible cable 3 is formed.
As shown in FIG. 3, in this flexible cable 3, at least one end portion of the wiring 30 is formed by removing the film 34, the protective film 32, and the like to form a connection portion 30 </ b> C whose surface is exposed.
As shown in FIGS. 3 and 4, the penetration part 35 and the penetration part 36 are formed in the connection site 30 </ b> C. Here, the penetrating part 35 and the penetrating part 36 are formed by punching. Further, the penetration part 35 and the penetration part 36 may be formed by etching.

  On the other hand, the connector 2 shown in FIG. 6 is formed. The lead wiring 21 is integrally formed in the resin housing 20 to form the connector 2. The lead wiring 21 has a first contact portion 21A at one end and a second contact portion 21B at the other end. The line and space of the second contact portion 21B is set to the same dimension as the line and space of the connection part 30C of the flexible cable 3. The connector 2 is manufactured in parallel with the manufacture of the flexible cable 3 or before and after the manufacture of the flexible cable 3.

  Next, as illustrated in FIG. 7A, a solder paste 4 </ b> A is formed on the surface of the second contact portion 21 </ b> B of the connector 2. The solder paste 4A is formed using, for example, a screen printing method. Here, the enlarged cross-sectional view shown in FIG. 7A and the enlarged cross-sectional views shown in FIGS. 7B and 7C which will be described later are cut and enlarged along the line BB shown in FIG. FIG.

  Subsequently, as shown in FIG. 7B, the connection portion 30C of the flexible cable 3 is positioned and arranged on the surface of the second contact portion 21B with the solder paste 4A interposed. FIG. 7B shows an enlarged cross-sectional view of the connection site 30 </ b> C including the through portion 35.

Next, as shown in FIG. 7C, here, the electric soldering iron 5 is simultaneously brought into contact with all the connection parts 30C, and heat is applied from the electric soldering iron 5 to the solder paste 4A through the connection part 30C. The electric soldering iron 5 is energized for several seconds, for example, 5 to 8 seconds, and generates heat when energized.
When the heat is applied, the solder paste 4A is melted, cooled after being melted, and the solder 4 is formed from the solder paste 4A as shown in FIG.

The solder 4 shown in FIG. 8A is a side fillet 40 that firmly wets up to the side surface of the penetrating portion 35 disposed in the connection portion 30C, and the solder joint state between the second contact portion 21B and the connection portion 30C is as follows. Determined to be good.
On the other hand, the solder 4 shown in FIG. 8B is a side fillet 41 that has not been wetted up to the side surface of the penetrating portion 35, and it is determined that the solder joint state between the second contact portion 21B and the connection portion 30C is not good. The
Thus, in the connector structure 1, the solder joint state by the solder 4 can be observed (inspected) visually or by image recognition processing using a camera from the Z direction. The connector structure 1 determined to have a good solder joint state is regarded as a non-defective product, and the connector structure 1 determined to be not in a good solder joint state is regarded as a non-defective product and selected.

  When these series of steps are finished, the manufacturing method of connector structure 1 according to the present embodiment is finished.

(Operation and effect of the present embodiment)
As shown in FIGS. 3 to 5, the flexible cable 3 according to the present embodiment includes a film 34 (and a protective film 32) and a wiring 30. The film 34 is made of a resin having flexibility and insulating properties. The wiring 30 extends on one surface of the film 34 and has conductivity. At least the connection part 30C of the wiring 30 is formed with a certain wiring width dimension.

  Here, as shown in FIGS. 3 and 4, the flexible cable 3 includes a through portion 35 and a through portion 36. The penetrating part 35 and the penetrating part 36 are disposed in the connection part 30 </ b> C of the wiring 30, and the penetrating part 35 and the penetrating part 36 penetrate in the thickness direction of the wiring 30. As shown in FIGS. 8A and 8B, the through part 35 and the through part 36 may be used as an observation part (or an inspection part to be inspected) for observing the side fillets 40 and 41 of the solder 4. it can.

  FIG. 8C shows a flexible cable and connector structure according to a comparative example corresponding to FIG. In the flexible cable according to the comparative example, the penetrating portion 35 and the penetrating portion 36 are not provided at the connection site 30C. In the flexible cable according to the comparative example, the wiring width dimension of the connection portion 30C and the contact width dimension of the second contact portion 21B are set to the same dimension. The side fillet 42 is observed by viewing 6 from above in the Z direction. In particular, it is difficult to observe the side fillet 42 of the solder 4 when the line and space of the connection part 30C and the second contact portion 21B are miniaturized.

On the other hand, in the flexible cable 3 according to the present embodiment, since the through portion 35 and the through portion 36 are disposed in the connection portion 30C, as shown in FIG. The side fillet 40 can be easily observed. Further, as shown in FIG. 8B, the side fillet 41 of the solder 4 can be easily observed.
For this reason, it is possible to easily determine the quality of the solder joint state between the connection portion 30C and the second contact portion 21B.

Further, in the flexible cable 3 according to the present embodiment, as shown in FIG. 5, the protective film 32 is provided on one surface of the film 34 with the wiring 30 interposed therebetween. The protective film 32 is made of a resin having flexibility and insulating properties. Then, as shown in FIGS. 3 and 4, the connection part 30 </ b> C is formed by removing a part of the film 34 and the protective film 32 and exposing the surface of the wiring 30.
For this reason, since all the surfaces of the front surface, the back surface, and the side surfaces are exposed at the connection portion 30C of the wiring 30, as shown in FIG. The wettability of the solder 4 can be ensured.

  Furthermore, in the flexible cable 3 according to the present embodiment, as shown in FIGS. 3 and 4, the through portion 35 is at one end in the wiring width direction at the connection portion 30C, and the through portion 36 is at the wiring width at the connection portion 30C. It is disposed at the other end in the direction. That is, since the penetration part 35 and the penetration part 36 are disposed at both ends in the wiring width direction of the connection part 30C, for example, the penetration part 35 and the penetration part 36 are set at positions where they can be easily observed when viewed from the thickness direction of the wiring 30. For this reason, the quality of the solder joint state of the solder 4 can be easily determined.

  Further, in the flexible cable 3 according to the present embodiment, as shown in FIG. 4 in particular, the through part 35 and the through part 36 disposed at both ends of the wiring 30 in the wiring width direction are formed as notches. The notch has a semicircular shape. The cutout portion has an arc shape when viewed from the thickness direction of the wiring 30 and has a shape in which stress concentration is less likely to occur compared to the square shape. For this reason, it is possible to effectively suppress or prevent the occurrence of disconnection at the connection portion 30 </ b> C of the wiring 30.

Furthermore, the connector structure 1 according to the present embodiment includes a flexible cable 3 and a connector 2 as shown in FIGS. 1 and 2.
The flexible cable includes a film 34 (or a protective film 32) and a wiring 30 as shown in FIG. The film 34 is made of a resin having flexibility and insulating properties. The wiring 30 extends on one surface of the film 34 and has conductivity. At least the connection part 30C of the wiring 30 is formed with a certain wiring width dimension.
On the other hand, the connector 2 includes a housing 20 and lead wires 21. The housing 20 has an insulating property. The lead wiring 21 is disposed in the housing 20. One end portion of the lead wiring 21 has a first contact portion 21A. The other end portion of the lead wiring 21 has a second contact portion 21B, and the second contact portion 21B is formed to have the same contact width dimension as the wiring width dimension of the connection portion 30C of the wiring 30.

Here, as shown in FIG. 1 to FIG. 4, the connector structure 1 includes a penetration portion 35 and a penetration portion 36 in the connection portion 30 </ b> C of the wiring 30 in the flexible cable 3, and is shown in FIG. As described above, the solder 4 is provided between the second contact portion 21B of the connector 2 and the connection portion 30C. The penetration part 35 and the penetration part 36 are disposed in the connection part 30 </ b> C and penetrate the wiring 30 in the thickness direction. The solder 4 electrically and mechanically connects the second contact portion 21B and the connection portion 30C, and the side fillet 40 (or 41) can be observed in the through portion 35 and the through portion 36.
For this reason, as shown in FIG. 8A, by observing the side fillet 40 of the solder 4 at the through portion 35 and the through portion 36, the quality of the solder joint state between the second contact portion 21B and the connection portion 30C is determined. Can be easily determined.

In the connector structure 1 according to the present embodiment shown in FIG. 8A, the flexible cable 3 is formed on the side fillet 40 where the solder 4 is sufficiently wetted up to the side surface of the through portion 35 of the connection portion 30C. Yes. The side fillet 40 can be easily observed when viewed from the thickness direction of the connection portion 30C, and it is determined that the solder joint state is good.
On the other hand, in the connector structure 1 according to the present embodiment shown in FIG. 8B, the solder 4 is formed on the side fillet 41 where the solder 4 is not wetted up to the side surface of the through portion 35 of the connection site 30C. The side fillet 41 can be easily observed, and it is determined that the soldered state is not good.
Further, in the connector structure according to the comparative example shown in FIG. 8C, the line and space of the second contact portion 21B and the connection portion 30C are the same size, and the space interval is fine. It is difficult to observe the side fillet 42. For this reason, it is difficult to determine the quality of the soldered state.

Further, in the method for manufacturing the connector structure 1 according to the present embodiment, as shown in FIGS. 3 and 4, the through portion 35 and the through portion 36 are formed in the connection portion 30 </ b> C of the flexible cable 3. As shown in FIG. 5, the flexible cable 3 is provided with a conductive wiring 30 on one surface of a resinous film 34 having flexibility and insulating properties. As shown in FIGS. 3 and 4, at least the connection part 30 </ b> C of the wiring 30 is formed with a certain wiring width dimension. The penetration part 35 and the penetration part 36 are formed in the connection part 30C and penetrated in the thickness direction.
On the other hand, the connector 2 is formed. As shown in FIG. 6, the connector 2 includes a lead wire 21 disposed in a housing 20 having an insulating property. One end portion of the lead wiring 21 has a first contact portion 21A. The other end portion of the lead wiring 21 has a second contact portion 21B, and the second contact portion 21B is formed to have the same contact width dimension as the wiring width dimension of the connection portion 30C.
Then, as shown in FIG. 7A, the solder paste 4A is formed on the second contact portion 21B of the connector 2. Subsequently, as shown in FIG. 7B, the connection part 30C is arranged with the solder paste 4A interposed in the second contact portion 21B, and after the heating step shown in FIG. ), The solder 4 that electrically and mechanically connects the second connector portion 21B and the connection portion 30C is formed from the solder paste 4A. Thereafter, the quality of the solder joint is determined.

  Here, as shown in FIGS. 3 and 4, a penetration part 35 and a penetration part 36 are formed in the connection part 30 </ b> C of the flexible cable 3. As shown in FIGS. 8A and 8B, the side fillet 40 or the side fillet 41 of the solder 4 can be easily observed at the through portion 35 and the through portion 36. For this reason, in the manufacturing method of the connector structure 1, the quality of the solder joint can be easily determined.

In the present embodiment, in the flexible cable 3, a penetration part 35 and a penetration part 36 are provided at both ends in the wiring width direction of the connection part 30 </ b> C of the wiring 30. For this reason, since the wet-up state of the solder 4 can be observed at both ends of the connection part 30C in the wiring width direction, the quality of the solder joint state can be accurately determined.
However, in this embodiment, if either one of the through part 35 at one end of the connection portion 30C in the wiring width direction and the through part 36 at the other end in the wiring width direction are provided, the solder joint state can be determined. It can be determined sufficiently accurately.

[Second Embodiment]
The flexible cable 3, the connector structure 1, and the manufacturing method thereof according to the second embodiment of the present invention will be described with reference to FIG. In the present embodiment, a modified example of the penetration part 35 and the penetration part 36 of the flexible cable 3 will be described. Here, in the present embodiment, the same components as those described in the first embodiment, or substantially the same components, are denoted by the same reference numerals, and redundant description is omitted.

As shown in FIG. 9A, the flexible cable 3 according to the present embodiment includes a cutout formed in a U-shape in the connection portion 30 </ b> C of the wiring 30 when viewed from the thickness direction of the wiring 30. A penetrating part 35A and a penetrating part 36A are provided as parts. The through portion 35A is formed to be recessed inward in the wiring width direction at one end of the connection portion 30C in the wiring width direction. The through portion 36A is formed to be recessed inward in the wiring width direction at the other end in the wiring width direction of the connection part 30C.
In the flexible cable 3 according to the present embodiment, the connector structure 1 including the flexible cable 3 and the manufacturing method thereof, the flexible cable, the connector structure 1 and the manufacturing thereof according to the first embodiment described above. The same effects as those obtained by the method can be obtained.

(First modification)
As shown in FIG. 9B, the flexible cable 3 according to the first modified example of the present embodiment includes a through portion 35B as a notch portion and a through portion formed in a semi-elliptical shape at the connection site 30C. A portion 36B is provided.
In the flexible cable 3 according to the first modified example, the connector structure 1 including the flexible cable 3, and the manufacturing method thereof, the flexible cable 3, the connector structure 1 according to the first embodiment described above, and the method thereof. Effects similar to the effects obtained by the manufacturing method can be obtained.

(Second modification)
As shown in FIG. 9C, the flexible cable 3 according to the second modification of the present embodiment is formed in a circular shape at the connection portion 30C when viewed from the thickness direction of the wiring 30. A through portion 35C as a through hole is disposed. The through portion 35C is formed through the wiring 30 in the thickness direction at the intermediate portion in the wiring width direction of the connection site 30C.
In the flexible cable 3 according to the second modification, the connector structure 1 including the flexible cable 3, and the manufacturing method thereof, the flexible cable 3, the connector structure 1 according to the above-described first embodiment, and the method thereof. Effects similar to the effects obtained by the manufacturing method can be obtained.

(Third Modification)
As shown in FIG. 9D, in the flexible cable 3 according to the third modification of the present embodiment, a through portion 35D as a through hole formed in an elliptical shape is disposed in the connection portion 30C. Has been.
In the flexible cable 3 according to the third modified example, the connector structure 1 including the flexible cable 3, and the manufacturing method thereof, the flexible cable 3, the connector structure 1 according to the first embodiment described above, and the method thereof. Effects similar to the effects obtained by the manufacturing method can be obtained.

(Fourth modification)
As shown in FIG. 9 (E), in the flexible cable 3 according to the fourth modification of the present embodiment, a through-hole 35E as a through-hole formed in a long hole shape is arranged at the connection site 30C. It is installed.
In the flexible cable 3 according to the fourth modified example, the connector structure 1 including the flexible cable 3, and the manufacturing method thereof, the flexible cable 3, the connector structure 1 according to the first embodiment described above, and the method thereof. Effects similar to the effects obtained by the manufacturing method can be obtained.

[Supplementary explanation of the above embodiment]
The present invention is not limited to the above-described embodiment, and can be modified as follows, for example, without departing from the gist thereof.
In the present invention, a flexible printed circuit board in which a copper foil or a copper alloy thin film is arranged as a wiring on a flexible resin substrate such as polyimide resin is used as a flexible cable, and a connector structure is constructed using the flexible cable. May be.

DESCRIPTION OF SYMBOLS 1 ... Connector structure, 2 ... Connector, 20 ... Housing, 21 ... Lead wiring, 21A ... 1st contact part, 21B ... 2nd contact part, 3 ... Flexible cable, 30 ... Wiring, 30C, 30C1-30Cn ... Connection Site, 32 ... Protective film, 34 ... Film, 35, 35A to 35E, 36, 36A, 36B ... Penetration part, 4 ... Solder, 4A ... Solder paste, 40-42 ... Side fillet.

Claims (6)

A resinous film having flexibility and insulation;
Conductive wiring in which at least a connection site is extended with a certain wiring width dimension on one surface of the film,
A penetrating portion disposed in the connecting portion and penetrating in the thickness direction of the wiring;
Flexible cable with On one surface of the film, a resin protective film having flexibility and insulating properties is provided with the wiring interposed therebetween,
The flexible cable according to claim 1, wherein the connection part is formed by removing a part of the film and the protective film and exposing a surface of the wiring. The flexible cable according to claim 1, wherein the penetrating portion is disposed at one end in the width direction, both ends in the width direction, or a middle portion in the width direction of the wiring at the connection site. The penetrating portion disposed at one end in the width direction of the wiring or both ends in the width direction is formed as a semicircular, U-shaped or semi-elliptical cutout when viewed from the thickness direction of the wiring,
The through-hole disposed in the intermediate portion in the width direction of the wiring is formed as a through-hole having a circular shape, an elliptical shape, or a long hole shape as viewed from the thickness direction of the wiring. Flexible cable. A resinous film having flexibility and insulation;
Conductive wiring in which at least a connection site is extended with a certain wiring width dimension on one surface of the film,
A flexible cable configured to include a penetrating portion disposed in the connection portion and penetrating in the thickness direction of the wiring;
An insulating housing;
A lead wire disposed in the housing, having a first contact portion at one end and a second contact portion formed at the other end with the same contact width as the wire width of the connection portion; A connector comprising, and
Solder that is disposed between the second contact portion and the connection portion, electrically and mechanically connects the second contact portion and the connection portion, and a side fillet can be observed in the penetration portion;
Connector structure with Flexibility in which a conductive wiring having at least a connecting portion extending with a certain wiring width dimension is disposed on one surface of a resin film having flexibility and insulation. Forming a penetrating portion penetrating in the thickness direction in the connection portion of the cable; and
A lead wiring which is disposed in an insulating housing, has a first contact portion at one end, and has a second contact portion formed at the other end with the same contact width dimension as the wiring width dimension of the connection portion. Forming a connector comprising:
Forming a solder paste on the second contact portion;
Arranging the connection part with the solder paste interposed in the second contact part, and forming solder for electrically and mechanically connecting the second contact part and the connection part from the solder paste;
Observing the side fillet of the solder in the penetrating portion and determining whether the solder joint portion is good,
A method for manufacturing a connector structure comprising: