JP2017204379A - Flat wire connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flat wire connection structure which can maintain the connection reliability between a strip conductor path of a flat wire and a terminal fitting even when the flat wire is provided with a reinforcing plate.SOLUTION: A flat wire connection structure 10 comprises a flat wire 30 and a terminal fitting 20. The flat wire 30 includes a plurality of separated strip portions 33 which is obtained by individually separating, at one end 30B of the flat wire 30, a plurality of strip conductor paths 31. Each of the separated strip portions 33 includes: the strip conductor path 31; and insulation resin 32 for covering the strip conductor path 31. Each of the separated strip portions 33 includes an exposed portion, on one face 33F of a tip 33A of the separated strip portion 33, from which the strip conductor path 31 is exposed. A reinforcing plate 35 for reinforcing the tip 33A is individually provided on another face 33R of the tip 33A of each of the separated strip portions 33.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a connection structure for flat electric wires, and more particularly, to a connection structure between a flat electric wire and a terminal fitting when the flat electric wire is attached to a connector housing.

  Conventionally, as a connection structure between a flat electric wire and a terminal fitting when the flat electric wire is attached to a connector housing, for example, one disclosed in Patent Document 1 is known. Patent Document 1 discloses a flat harness provided with a plurality of stages of connector housings in which a plurality of terminal accommodating chambers for accommodating terminal fittings are arranged in the width direction of a circuit component (flat electric wire). By providing such a connector housing, the flat harness is reduced in size.

JP2013-20800A

  However, when the flat electric wire is a flexible flat electric wire such as a flexible printed circuit board (FPC), the insertion work is stable when the terminal fitting to which the conducting wire of the flat electric wire is connected is inserted into the terminal accommodating chamber. A reinforcing plate may be provided on the flat wire so that it can be done. By providing such a reinforcing plate, the insertion work can be performed stably, but depending on the configuration of the reinforcing plate, stress acts from the reinforcing plate to the connecting part of the flat wire conductor (band conductor track) and the terminal fitting. It is possible to do. When stress acts on the connection portion, the reliability of the connection portion may be reduced.

  The technology disclosed in the present specification has been completed based on the above circumstances, and even when a reinforcing plate is provided on the flat electric wire, the strip-like conductor path of the flat electric wire, the terminal fitting, Provided is a flat wire connection structure capable of maintaining the reliability of connection.

  The flat wire connection structure disclosed in this specification includes a flat wire including a plurality of strip-shaped conductor tracks that are wired in parallel at intervals, an insulating resin that covers each strip-shaped conductor track, and each strip-shaped conductor track. A plurality of terminal fittings individually connected to each other, and the flat electric wire is a plurality of separation band-like portions in which the plurality of strip-like conductor paths are individually separated at one end thereof, The portion includes a plurality of separation band-shaped portions including the band-shaped conductor path and the insulating resin, and each separation band-shaped portion includes an exposed portion where the band-shaped conductor path is exposed on one surface of the tip portion, The terminal fitting includes a conductor path connecting portion that is connected to the strip-shaped conductor path of the exposed portion, and a reinforcing plate that reinforces the tip end portion is individually provided on the other surface of the tip end portion of each separation band-shaped portion. It has been.

  According to this configuration, the reinforcing plate that reinforces the tip is provided separately on one surface (the other surface) of the tip of each separation strip. That is, a reinforcing plate is individually provided at the tip portion corresponding to the tip portion of each separation band-like portion. Therefore, for example, when the strip-shaped conductor path of the exposed portion and the conductor path connection portion of the terminal metal are solder-connected, the positional deviation between the separation band-shaped portion and the terminal metal is less than when the reinforcing plate is integrally formed. Generation of stress due to the solder connection portion can be suppressed. Thereby, even when the reinforcing plate is provided on the flat electric wire, it is possible to maintain the reliability of the connection between the strip-shaped conductor path of the flat electric wire and the terminal fitting.

In the flat electric wire connection structure, the connector includes a connector housing including a plurality of terminal accommodating chambers for individually accommodating the respective terminal fittings to which the strip-shaped conductor paths are connected, and the reinforcing plate has the strip-shaped conductor paths connected thereto. The terminal fitting may have a length that allows the reinforcing plate to be exposed from the connector housing in a state of being accommodated in the terminal accommodating chamber.
According to this configuration, when attaching the flat electric wire to the connector housing, the terminal fitting can be inserted into the terminal receiving chamber while holding the reinforcing plate until the terminal fitting is completely inserted into the terminal receiving chamber. As a result, the work of attaching the flat wire to the connector housing is made efficient.

In the flat electric wire connection structure, the flat electric wire may be configured by a flexible printed circuit board (FPC).
According to this structure, the reinforcement board can be made into the shape which divided | segmented each separation strip | belt-shaped part using the softness | flexibility of a flexible printed circuit board (FPC). That is, the terminal fitting to which the separation band-like portion provided with the reinforcing plate is connected can be inserted into the terminal accommodating chamber using the flexibility of the FPC. Thereby, the insertion operation is simplified.

  According to the connection structure of the flat electric wire disclosed in the present specification, the reliability of the connection between the strip-shaped conductor path of the flat electric wire and the terminal fitting can be maintained even when the reinforcing plate is provided on the flat electric wire.

The perspective view of the connection structure of the flat electric wire which concerns on one Embodiment Top view of flat wire connection structure Sectional drawing along the AA line of FIG. Perspective view of flat wire Top view of flat wire Rear view of flat wire The perspective view which shows the state in which the terminal metal fitting was connected to the flat electric wire The perspective view which shows the state in which the flat electric wire was attached to the connector housing A plan view showing a state in which a flat wire is attached to the connector housing Sectional drawing along the BB line of FIG.

<Embodiment>
An embodiment according to the present invention will be described with reference to FIGS.
1. Configuration of Flat Electric Wire Connection Structure The flat electric wire connection structure 10 of the present embodiment exemplifies a case where it is applied to a voltage detection line connected between a battery (not shown) and a control unit. As shown in FIG. 1, the flat wire connection structure 10 includes a terminal fitting 20 (see FIG. 3), a flat wire 30, a connector housing 40, a first holding member 50, and a second holding member 60. Hereinafter, of the length direction of the flat electric wire 30, the connector housing 40 side is described as the front side, the other is the rear side, and the same direction as the width direction of the flat electric wire 30 is described as the width direction of the connector housing 40.

  As shown in FIGS. 1 to 3, the connector housing 40 is made of a synthetic resin having a block shape, and includes a housing main body 41 and a plurality of cavities 42 (corresponding to terminal housing chambers).

  A plurality of cavities 42 that can accommodate the terminal fittings 20 are formed through the housing body 41 from the rear side in the front-rear direction. In this embodiment, the cavities 42 are arranged in parallel in the width direction in five chambers, and each front end thereof is an insertion hole 42A through which a male terminal fitting held by the mating connector is inserted. . Further, at the rear end of the housing body 41, a first locking portion 43 (see FIG. 3) that engages with the first locked portion 51 of the first holding member 50 that holds the flat electric wire 30, and a second holding A second locking portion 44 (see FIG. 2) that engages with the second locked portion 61 of the member 60 is provided.

  The terminal fitting 20 accommodated in the cavity 42 is a female terminal fitting obtained by press molding a metal plate material. As shown in FIG. 7 and the like, the terminal fitting 20 includes a rectangular tube-shaped terminal connection portion 21 and a flat conductor path connection portion 22 extending rearward from the rear end of the terminal connection portion 21. The conductor path connecting portion 22 is joined to the exposed strip-shaped conductor path 31A of the flat wire 30 described later by solder.

  The first holding member 50 and the second holding member 60 are made of synthetic resin, and as shown in FIGS. 1 and 3, at the rear end of the housing body 41, the first locking portion 43 and the second locking member It is attached via part 44. At that time, the first holding member 50 and the second holding member 60 are coupled to each other, and the flat electric wire 30 is sandwiched therebetween to hold the flat electric wire 30.

  In this embodiment, the flat electric wire 30 is configured by a flexible printed circuit board (FPC). The flat electric wire 30 is led out from the rear end of the connector housing 40 and is connected between a battery (not shown) and a control unit that controls the battery by a strip-shaped conductor path 31 formed along the leading (extending) direction. It has a voltage detection line-like function.

  As shown in FIG. 4, the flat electric wire 30 includes a plurality of strip-shaped conductor paths 31 that are wired in parallel at intervals, and an insulating resin film 32 that covers both surfaces of each strip-shaped conductor path 31. Each strip-shaped conductor path 31 is made of, for example, copper foil. In addition, both surfaces of each strip-shaped conductor path 31 may not be covered with the insulating resin film 32. The insulating resin is not limited to a film-like insulating resin. For example, the insulating resin may be a sheet-like insulating resin thicker than the film, or may be an insulating resin applied on an insulating resin film to be a substrate. The insulating resin film is an example of an insulating resin.

  As shown in FIG. 4, the flat electric wire 30 includes a plurality of strip conductor paths 31 at one end 30 </ b> B and an electric wire main body 30 </ b> A in which a plurality of strip conductor paths 31 are integrally covered with an insulating resin film 32. Includes a plurality of separation strips 33 that are individually separated. In addition, in this embodiment, although the case where the strip | belt-shaped conductor track 31 is five is shown, it is not restricted to this.

  Each separation strip 33 includes a strip conductor path 31 and an insulating resin film 32. Further, as shown in FIG. 5, each separation strip 33 includes an exposed portion 34 including an exposed strip-shaped conductor path 31 </ b> A on the surface 33 </ b> F of the tip 33 </ b> A (corresponding to one surface). That is, the insulating resin film 32 is omitted from the exposed portion 34.

  On the other hand, on the back surface (corresponding to the other surface) 33R of the distal end portion 33A of each separation band-shaped portion 33, as shown in FIG. 6, a reinforcing plate 35 that reinforces the distal end portion 33A is the entire back surface 33R of the distal end portion 33A. It is provided so as to cover. The reinforcing plate 35 is made of, for example, glass epoxy resin or polyimide resin.

Further, as shown in FIG. 6, the reinforcing plate 35 is exposed from the connector housing 40 in a state where the terminal fitting 20 to which the strip-shaped conductor path 31 is connected is housed in the cavity 42 of the connector housing 40, and the separation strip-shaped portion 35 includes a gripping portion 35A that can be gripped together (see FIG. 10). In other words, the reinforcing plate 35 has a length in the longitudinal direction that exposes the reinforcing plate 35 from the connector housing in a state where the terminal fitting 20 to which the strip-shaped conductor path 31 is connected is accommodated in the cavity 42.
Further, a common reinforcing plate 36 having the same width of the flat electric wire 30 is provided on the back surface 33R of the electric wire main body 30A of the flat electric wire 30.

2. First, the terminal fitting 20 is joined to the flat electric wire 30 in a flat state shown in FIGS. Specifically, the conductor path connecting portion 22 of the terminal fitting 20 is joined to each strip-shaped conductor path 31A where the flat electric wire 30 is exposed by reflow soldering. Then, the connection structure of the terminal metal fitting 20 and the flat electric wire 30 as shown in FIG. 7 is formed.

  Subsequently, from the rear side of the connector housing 40, each terminal fitting 20 to which the strip-shaped conductor path 31 </ b> A is joined is inserted into the cavity 42, and each terminal fitting 20 is fixed to the connector housing 40. At that time, the terminal fitting 20 is inserted into the cavity 42 while holding the holding portion 35 </ b> A of the reinforcing plate 35 together with the separation band-like portion 33. As a result, as shown in FIGS. 8 to 10, a connection structure in which the flat electric wire 30 is attached to the connector housing 40 in a flat state is formed.

  Next, the first holding member 50 is moved to the rear of the connector housing 40 by engaging the first locked portion 51 of the first holding member 50 with the first locking portion 43 of the housing body 41 at the rear of the connector housing 40. Install at the bottom.

  Subsequently, at the rear of the connector housing 40, the second holding member 60 is engaged with the second locking portion 44 of the housing body 41 by engaging the second locked portion 61 of the second holding member 60 with the connector housing 40. Install backwards. At that time, as shown in FIG. 2, each separation band portion 33 of the flat electric wire 30 is sandwiched between the first holding member 50 and the second holding member 60, and the corner portion of the first holding member 50 is The second holding member 60 is bent at the corner.

Each separation strip 33 is bent in the space formed by the first holding member 50 and the second holding member 60. In addition, the portion of the flat electric wire 30 in front of the flat electric wire 30 that is exposed to the outside is sandwiched between the first holding member 50 and the second holding member 60 via the common reinforcing plate 36.
Thereby, the assembly of the flat wire connecting structure 10 as shown in FIG. 1 is completed.

3. Effects of the present embodiment In the present embodiment, the reinforcing plate 35 that reinforces the distal end portion 33A is provided separately on the back surface (the other surface) 33R of the distal end portion 33A of each separation strip 33 of the flat wire 30. It has been. That is, the reinforcing plate 35 is individually provided at the distal end portion 33 </ b> A corresponding to the distal end portion 33 </ b> A of each separation band-shaped portion 33. Therefore, when the strip-shaped conductor path 31 </ b> A of the exposed portion of the separation band-shaped portion 33 and the conductor path connection portion 22 of the terminal fitting 20 are solder-connected, for example, the reinforcing plate 35 is integrally formed integrally with each separation band-shaped portion 33. Compared with the case where it is made, it can suppress that the stress resulting from the position shift of the isolation | separation strip | belt-shaped part 33 and the terminal metal fitting 20 generate | occur | produces in the solder connection part 37. FIG. Thereby, even when the reinforcing plate 35 is provided on the flat electric wire 30, the reliability of the connection between the strip-shaped conductor path 31 of the flat electric wire 30 and the terminal fitting 20 can be maintained.

  The reinforcing plate 35 has a length that exposes the reinforcing plate 35 from the connector housing 40 in a state where the terminal fitting 20 to which the strip-shaped conductor path 31 </ b> A is connected is accommodated in the cavity 42. Therefore, when attaching the flat electric wire 30 to the connector housing 40, the terminal fitting 20 can be inserted into the cavity 42 while holding the reinforcing plate 25 until the insertion of the terminal fitting 20 into the cavity 42 is completed. As a result, the insertion work of the terminal fitting 20 into the cavity 42 is made efficient, and as a result, the attachment work of the flat wire 30 to the connector housing 40 is made efficient.

  Moreover, the flat electric wire 30 is comprised by the flexible printed circuit board (FPC). Therefore, the flexibility of the FPC can be utilized to make the reinforcing plate 35 divided into the separation band portions 33. That is, the terminal fitting 20 to which the separation band-like portion 33 provided with the reinforcing plate 35 is connected can be inserted into the cavity 42 using the flexibility of the FPC. Thereby, the insertion operation is simplified.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

  (1) In the above embodiment, the length of the reinforcing plate 35 in the longitudinal direction is the length exposed from the connector housing 40 in a state where the terminal fitting 20 to which the strip-shaped conductor path 31A is connected is housed in the cavity 42. Although an example was shown, it is not restricted to this. That is, the length in the longitudinal direction of the reinforcing plate 35 may be a length that is not exposed from the connector housing 40 in a state where the terminal fitting 20 is housed in the cavity 42.

  (2) In the said embodiment, although the flat electric wire 30 showed the example comprised by FPC, it is not restricted to this, For example, a flexible flat cable (FFC) may be sufficient.

  (3) In the above embodiment, the conductor path connecting portion 22 of the terminal fitting 20 is joined to the strip-shaped conductor path 31A by reflow soldering. However, the present invention is not limited to this, and laser welding, anisotropic conductive film, etc. It may be bonded by an anisotropic conductive resin.

  (4) In the above embodiment, the terminal fitting 20 is a so-called female type, but is not limited thereto, and may be a male type or a round terminal (so-called LA terminal). Also good.

  (5) In the above-described embodiment, the cavity 42 of the connector housing 40 is one stage. However, the cavity 42 is not limited to this, and may be two stages, for example, upper and lower stages.

DESCRIPTION OF SYMBOLS 10 ... Flat electric wire connection structure 20 ... Terminal metal fitting 22 ... Conductor path connection part 30 ... Flat electric wire (FPC)
30B: One end 31 of flat electric wire ... Strip-shaped conductor path 32 ... Insulating resin film (insulating resin)
33 ... Separation band 33A ... Separation band tip 33F ... Surface (one surface) of the separation band
33R ... Back side of the separation band (the other side)
34 ... exposed portion 35 ... reinforcing plate 40 ... connector housing 42 ... cavity (terminal accommodating chamber)

Claims (3)

A flat electric wire including a plurality of strip-shaped conductor tracks that are wired in parallel at intervals, and an insulating resin that covers each strip-shaped conductor track;
A plurality of terminal fittings individually connected to each strip-shaped conductor path;
With
The flat electric wire is a plurality of separation band-like parts in which the plurality of band-like conductor paths are individually separated at one end thereof, and each separation band-like part includes a plurality of separations including the band-like conductor path and the insulating resin. Including strips,
Each separation belt-like portion includes an exposed portion where the belt-like conductor path is exposed on one surface of the tip portion thereof,
Each terminal fitting includes a conductor path connecting portion connected to the strip-shaped conductor path of the exposed portion,
A flat wire connection structure in which a reinforcing plate for reinforcing the tip is individually provided on the other surface of the tip of each separation strip. In the flat electric wire connecting structure according to claim 1,
A connector housing including a plurality of terminal accommodating chambers for individually accommodating the respective terminal fittings to which the strip-shaped conductor paths are connected;
The reinforcing plate is
A flat wire connecting structure having a length that exposes the reinforcing plate from the connector housing in a state where the terminal fitting to which the strip-shaped conductor path is connected is housed in the terminal housing chamber. In the connection structure of the flat electric wire according to claim 1 or claim 2,
The flat electric wire is a flat electric wire connection structure constituted by a flexible printed circuit board (FPC).

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