JP4444249B2 - Cable connection method, electrical device manufacturing method, and electrical device - Google Patents

Description

  The present invention relates to a cable connection method for connecting a cable to an electric device, for example, an electric device manufacturing method, and an electric device.

  Conventionally, electrical signals are used in various devices such as automobiles, and various cables are provided to supply electrical signals to the devices. The number of such cables is increasing as the number of types of signal processing increases.

When the number of cables increases, the distance between the cables at the connection portion becomes narrow, which leads to a problem of defective products due to the bridge phenomenon. In order to prevent this bridging phenomenon, there is provided an elevating installation apparatus in which a plurality of lines are combined into one cable and a connector is provided at the tip, and connected by this connector (see Patent Document 1).
This lifting installation device is said to eliminate soldering by using a connector, thereby facilitating manufacture and reducing defective products.

  On the other hand, in an electrical apparatus such as an automobile, not only electrical equipment necessary for driving the automobile but also various electrical equipment such as a car navigation system and a car TV are mounted. In addition, these various electric devices include not only those that are always mounted but also electric devices that can be optionally mounted.

  However, if a connector is always attached to a cable used in such a wide variety of electric apparatuses, there is a problem that the number of connectors increases and the cost increases. In addition, for electrical equipment that can be installed as an option, it is necessary to attach an unnecessary cable connector unless an option is attached to the board to which the cable is to be connected, leading to an increase in overall cost. There was a point.

Japanese Utility Model Publication No. 5-89076

  In view of the above problems, an object of the present invention is to provide a cable connection method, an electrical device manufacturing method, and an electrical device that can connect cables at low cost.

  The present invention is a cable connection method for connecting each connection portion of a plurality of cables to each connection object, except for a bundling process for bundling a plurality of the cables and a welding connection portion connected by welding among the connection portions. After the connection process for connecting the non-welded connection part to the connection target is completed, the cable connection method performs the welding process for welding the welding connection part to the connection target.

The welding connection portion can be a connection portion that is connected by appropriate welding such as welding by soldering or ultrasonic welding.
The non-welded connection portion can be a connection portion that is not welded, such as a connection by various connectors or a connection by screws.

  According to the present invention, not only non-welded connection by a connector or the like but also welding by soldering or the like can be used together, and the cost can be reduced. Further, it is possible to prevent stress from being applied to the welded connection portion after welding.

As an aspect of the present invention, when there are a plurality of the welded connection portions, all the welded connection portions can be welded simultaneously to each connection object.
Thereby, it can prevent that stress is applied after welding about all the welding connection parts.

  The present invention also relates to an electrical device manufacturing method for manufacturing an electrical device in which each connection portion of a plurality of bundled cables is connected to each connection target, and a bundling process for bundling the plurality of cables, and each connection portion An electrical device manufacturing method for performing a welding process for welding the welded connection part to the connection target after the connection process for connecting a non-welded connection part other than the welded connection part connected by welding to the connection target is completed. can do.

  Thereby, an electrical device with few failures can be manufactured at low cost. More specifically, by not applying stress to the welded connection part after welding, it is possible to more reliably prevent the welded connection part from being disconnected or disconnected, and to reduce electrical device failures such as disconnection or connection disconnection. it can.

Further, the present invention is an electrical device in which each connection portion of a plurality of bundled cables is connected to each connection object, and is a bundling process for bundling the plurality of cables, and welding that is connected by welding among the connection portions After the connection process for connecting the non-welded connection part other than the connection part to the connection target is completed, the welded connection part can be an electric device welded to the connection target.
Thereby, an electrical device with few failures can be provided at low cost.

  According to the present invention, it is possible to provide a cable connection method, an electrical device manufacturing method, and an electrical device that can connect cables at low cost.

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing a schematic configuration of a part of the electric device 1. In the electrical device 1, a first board 2 and a second board (not shown) are electrically connected by a harness 3. In this embodiment, an automobile is used as the electric device 1, and the first board 2 and the second board are various boards such as a control board provided in the automobile.

  The harness 3 is a cable group in which separate first cables 31 and second cables 36 that are physically separated are bound by a binding band 30 in a prior binding process. The first cable 31 is a coaxial cable (for example, a pigtail type coaxial cable) used for a GPS antenna or the like, and has a bare connection end 32 provided at one end. The second cable 36 is a different type of cable from the first cable 31 such as a serial cable, and a connector 37 is provided at one end.

  The first cable 31 and the second cable 36 have moderate flexibility and can be bent or deformed. Therefore, the space between the binding band 30 to each exposed connection end 32 and the connector 37 is freely deformed, and each exposed connection end 32 and the connector 37 are connected to the connection contact portion 22 and the connector 26 of the first substrate 2 that are separated from each other. Each can be connected individually. Note that one of the connector 26 of the first substrate 2 and the connector 37 of the harness 3 connected thereto is male and the other is female.

The first substrate 2 is provided with a connection contact portion 22 to which the exposed connection end 32 of the first cable 31 is connected by soldering and a connector 26 to which the connector 37 of the second cable 36 is connected.
The electric device 1 configured as described above is manufactured by an electric device manufacturing method using a cable connection method described below.

  FIG. 2 is an explanatory diagram for explaining each process of cable connection of the electric device 1 with an overall view, and FIG. 3 is an explanatory diagram for explaining a part of the cable connection process of the electric device 1 with an enlarged view.

  First, the manufacturer prepares the first substrate 2 and the harness 3 as shown in the perspective view of FIG. Here, the harness 3 is preferably manufactured by a manufacturer specializing in harness assembly. However, the harness 3 may be created by performing a bundling process (harness assembly process) for bundling the first cable 31 and the second cable 36 with the bundling band 30. . Further, the other end of the harness 3 (not shown) may be appropriately connected to a second board (not shown).

  Next, as shown in the perspective view of FIG. 2B, a first connection step of correctly connecting the connector 37 of the harness 3 to the connector 26 of the first substrate 2 is performed.

  Next, as shown in the perspective view of FIG. 2C, the exposed connection end 32 of the first cable 31 of the harness 3 is connected to the connection contact portion 22 of the first substrate 2. This connection is performed in two stages as shown in FIG.

First, from the state before the connection shown in the enlarged perspective view of FIG. 3A, as shown in the enlarged perspective view of FIG. 3B, the external conductor 32b of the exposed connection end 32 is fixed to the first substrate 2 by the fixing knob. The 2nd connection process fixed to 22b is performed.
By this second connection step and the first connection step, all steps other than soldering in the step of connecting the first substrate 2 and the second substrate with the harness 3 are completed.

  Then, as shown in the enlarged perspective view of FIG. 3C, the inner conductor 32a of the first cable 31 is soldered (solder welded) to the contact 22a of the first substrate 2 with solder 8 and fixed. 3 connection process is performed.

  By the above method, the connection to the first substrate 2 of the harness 3 in which the connection portion (exposed connection end 32) requiring soldering and the connection portion (connector 37) by the connector are mixed is completed, and the electric device 1 Complete.

  By manufacturing in this way, soldering can be made the last step of the manufacturing process, and stress can be prevented from being applied to the soldered portion after soldering in the manufacturing process. That is, for example, when the internal conductor 32a of the bare connection end 32 is first soldered and then the connector 37 is to be connected, or when the first cable 31 and the second cable 36 in a loose state are soldered and connected. When an attempt is made to bind with the binding band 30 after completing the connection, the first cable 31 is pulled or pressed by the operation of connecting the connector 37 or the binding operation, and the contact with the inner conductor 32a of the exposed connection end 32 Stress is applied to the portion where 22 a is welded by solder 8. For this reason, distortion occurs in the welded portion by the solder 8. As a result, even if the internal conductor 32a and the contact 22a are apparently connected, if the completed electric device 1 is subjected to vibration or impact, the internal conductor 32a and the contact 22a may be disconnected internally due to this influence. A problem that the inner conductor 32a and the contact 22a are disconnected may occur. Further, when the first substrate 2 and the second substrate are provided with the movable part sandwiched therebetween, the distortion that has occurred in the solder 8 due to the deformation of the harness 3 due to the movement, etc. is expanded, and the disconnection between the internal conductor 32a and the contact 22a There may be a problem of missing. However, according to the present embodiment, since soldering is the last, such a problem does not occur, and the internal conductor 32a and the contact 22a can be firmly soldered.

  Further, the first cable 31 and the second cable 36 can be connected after being bound by the binding band 30 instead of being bound to the first substrate 2 after being separately connected. In other words, it is possible to omit the individual work of bundling after the soldering and connector connection are performed separately and manufacturing the harness 3 individually each time. For this reason, the harness 3 can be used in large quantities by a manufacturer specializing in harness assembly and used as a united part, and the harness 3 can be procured at low cost to reduce costs.

  Further, by separating the assembly process of the harness 3 and the connection process of connecting the harness 3 to the first substrate 2, the degree of freedom in process design is increased. As a result, it is possible to solve the conventional problem that the tact of the harness assembly process is long and short (for example, within 1 minute or 5 minutes or more) and is difficult to combine with other processes.

  In the above embodiment, the harness 3 is composed of the first cable 31 and the second cable 36. However, the harness 3 is not limited to this and may be composed of a large number of cables. Further, the harness 3 may be configured such that both ends of the first cable 31 are exposed and the connection ends 32 are provided, or a plurality of cables are provided with the exposed connection ends 32. When a plurality of exposed connection ends 32 are provided, all the exposed connection ends 32 may be soldered simultaneously with the same number of soldering irons. Thereby, it can prevent that stress is applied after soldering in the manufacturing process about all the soldering parts.

  Further, the first cable 31 to be soldered is not limited to the coaxial cable, and may be constituted by another cable having a connection portion that has been subjected to terminal processing (the sheath is peeled off). Even in this case, it is possible to prevent the soldering portion from being stressed in the manufacturing process by connecting in the order of the processes described above.

  Further, as shown in the perspective view of FIG. 4, instead of the binding band 30, the harness 3 is formed by winding a tape 39 of a predetermined length around the body portion in a state where the first cable 31 and the second cable 36 are bundled. May be. In this case, the first cable 31 and the second cable 36 can be freely connected with a predetermined length branching from the tip, and the body portion around which the tape 39 is wound can be handled as one cable. Therefore, even when the distance between the first board and the second board (not shown) is large, the harness 3 can be easily handled without the first cable 31 and the second cable 36 being entangled. In addition, when the tape 39 is used in this way, the body portion around which the tape 39 is wound has a certain degree of rigidity. Can be prevented.

  Further, by manufacturing the harness 3 in advance using the binding band 30 or the tape 39, the exposed connection end 32 that requires soldering can be processed into a predetermined shape. Thereby, the connection of the harness 3 to the 1st board | substrate 2 can be simplified.

  Further, the external conductor 32b of the exposed connection end 32 may be welded to the first substrate 2 by soldering or the like. In this case, it is preferable to weld the inner conductor 32a after welding the outer conductor 32b. Thereby, the same effect as the case where the outer conductor 32b of the exposed connection end 32 is fixed to the fixing knob 22b of the first substrate 2 can be obtained.

In correspondence between the configuration of the present invention and the above-described embodiment,
The bundled cables of the present invention correspond to the harness 3 of the embodiment,
Similarly,
The connection target corresponds to the connection contact portion 22 and the connector 26,
The cables correspond to the first cable 31 and the second cable 36,
The connection portion corresponds to the bare connection end 32 and the connector 37,
The weld connection corresponds to the bare connection end 32;
The non-welded connection corresponds to the connector 37,
The connection process corresponds to the first connection process,
The welding process corresponds to the third connection step,
The present invention is not limited only to the configuration of the above-described embodiment, and many embodiments can be obtained.

The perspective view which shows the one part schematic structure of an electric apparatus. Explanatory drawing explaining each process of the cable connection of an electric apparatus with a general view. Explanatory drawing explaining the one part process of the cable connection of an electric apparatus with an enlarged view. The perspective view which shows the one part schematic structure of the electric apparatus of other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Electric device, 3 ... Harness, 22 ... Connection contact part, 26, 37 ... Connector, 31 ... 1st cable, 32 ... Exposed connection end, 36 ... 2nd cable

Claims (4)

A cable connection method for connecting each connection portion of a plurality of cables to each connection target,
After the bundling process for bundling a plurality of the cables and the connection process for connecting the non-welded connection part other than the welded connection part connected by welding among the respective connection parts,
The cable connection method which performs the welding process which welds the said welding connection part to the said connection object. The cable connection method according to claim 1, wherein when there are a plurality of the welded connection portions, all the welded connection portions are welded simultaneously to each connection target. An electrical device manufacturing method for manufacturing an electrical device in which each connection portion of a plurality of cables is connected to each connection object,
After the bundling process for bundling a plurality of the cables and the connection process for connecting the non-welded connection part other than the welded connection part connected by welding among the respective connection parts,
An electrical device manufacturing method for performing a welding process for welding the welding connection portion to the connection target. An electrical device in which each connection portion of a plurality of cables is connected to each connection object,
After the bundling process for bundling a plurality of the cables and the connection process for connecting the non-welded connection part other than the welded connection part connected by welding among the respective connection parts,
An electric device in which the welding connection portion is welded to the connection target.

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