JP2008153066A - Branching connector and connector connected to branching connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a branching connector integrating a filter material for improving on distortion of transmission waveform and a connector to be connected with the branching connector. <P>SOLUTION: For the branching connector fitted at a position where a branch line is branched from a trunk line constituting a communication circuit and connected to or a connector connected to the branching connector, a connector housing is molded from resin containing ferrite, or a ferrite coating layer is fitted at a wall face of the connector housing made of a resin molded product. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a branch connector and a connector connected to the branch connector. More specifically, the present invention has a function of alleviating transmission waveform distortion generated in a branch connection portion that branches a branch line from a trunk line of a communication network such as an in-vehicle LAN. .

  In a communication network such as an in-vehicle network, when transmitting a signal from one communication device to another communication device, there is a problem that the transmission waveform is distorted due to electrical or magnetic noise and communication is not normally performed. is there. This waveform distortion occurs mainly due to signal reflection caused by impedance mismatch, and it is inevitable that impedance mismatch will occur at the branch point of the communication line and the connection point with the board accommodated in the communication device. It was. For this reason, various techniques for improving waveform distortion at a branch point or a connection point with a communication device have been proposed.

For example, in Japanese Patent Laid-Open No. 6-76886 (Patent Document 1), as shown in FIG. 8, the distortion of the transmission waveform is improved by passing the terminal 2 accommodated in the connector housing 1 through the cylindrical ferrite core 3. ing.
However, in the structure provided in Patent Document 1, each terminal 2 must be passed through the cylindrical ferrite core 3 and a structure for holding the ferrite core 3 is required. However, there is a problem that the structure of the connector housing 1 is complicated.

JP-A-6-76886

  The present invention has been made in view of the above problems, and it is an object of the present invention to provide a branch connector integrally including a filter material made of ferrite for improving distortion of a transmission waveform and a connector connected to the branch connector. Yes.

In order to solve the above-mentioned problems, the present invention provides, as a first invention, a branch connector provided at a position where a branch line branches and connects from a main line constituting a communication circuit,
A bus bar having a long joint portion and a plurality of terminal portions for electric wire connection projecting at an interval in the length direction of the joint portion;
A connector housing for accommodating the bus bar;
The connector housing is provided with a branch connector, wherein the connector housing is formed of a resin containing ferrite, or a ferrite coating layer is provided on a wall surface of the connector housing made of a resin molded product.

  The ferrite coating layer is provided on a wall surface of the connector housing including an outer peripheral surface of the connector housing and / or an inner peripheral surface of a connector fitting portion for fitting a connector connected to the branch line, and the ferrite coating layer Is preferably provided so as to surround the entire outer periphery around the axis of the electric wire connecting terminal portion of the bus bar.

In addition, as a second invention, the present invention provides a connector connected to the main line and the branch line that are fitted and connected to a branch connector provided at a position where the branch line branches from the main line constituting the communication circuit. There,
One end is connected to the terminal of the trunk line or branch line, the other end is connected to the branch connector, the terminal material connected to the terminal portion for electric wire connection provided on the bus bar in the branch connector,
A connector housing for accommodating the terminal material;
There is provided a connector characterized in that the connector housing is molded from a resin containing ferrite or a ferrite coating layer is provided on the wall surface of a connector housing made of a resin molded product.

  The ferrite coating layer is provided on an outer peripheral surface of the connector housing and / or a wall surface of the connector housing formed of an inner peripheral surface of a terminal accommodating chamber for accommodating the terminal material, and the ferrite coating layer is formed of the terminal material. It is preferable to be provided so as to surround the entire outer periphery around the axis.

According to the branch connector according to the first invention and / or the connector according to the second invention, the connector housing is formed of a resin containing ferrite as a magnetic material, or the wall surface of the connector housing is covered with ferrite. Because the layer is provided, the ferrite integrally provided in the connector housing absorbs the magnetic field generated in the vicinity of the branch connection part and converts it into heat, thereby reducing the high frequency component increased due to the impedance mismatch of the branch connection part. It is possible to improve the distortion of the transmission waveform that occurs at the branch connection.
Moreover, since the ferrite is integrally provided in the connector housing, it is not necessary to pass the terminal material connected to the trunk line or the branch line in the vicinity of the branch connection portion or the wire connection terminal portion of the bus bar through the separate ferrite. This eliminates the need for a separate ferrite from the connector housing and a structure for holding the ferrite, reduces the number of parts and the connector manufacturing process, and simplifies the structure of the connector housing.

Further, in the first invention, the ferrite coating layer surrounds the entire outer periphery around the axis of the terminal portion for connecting the electric wire of the bus bar. Alternatively, in the second invention, the ferrite coating layer is used to surround the outer periphery around the axis of the terminal material. If the entire circumference is enclosed, the terminal part or terminal material for connecting the electric wire of the bus bar is penetrated through the annular ferrite coating layer, and it becomes easier to improve the distortion of the transmission waveform generated at the branch connection part.
In particular, in the second invention, when a ferrite coating layer is provided on each inner peripheral surface of a terminal housing chamber that houses the terminal material, each terminal material is not penetrated through one ferrite coating layer. Therefore, the filter performance can be kept uniform.

  In addition, ferrite may be provided integrally in one of the connector housing of the branch connector and the connector connected to the branch connector, or ferrite is integrated in both the connector housings of the branch connector and the connector connected to the branch connector. May be provided.

  As described above, according to the present invention, since the ferrite for improving distortion of the transmission waveform is integrally provided in the connector housing, the terminal material or bus bar connected to the main line or branch line in the vicinity of the branch connection portion is provided. The distortion of the transmission waveform can be improved without passing the wire connecting terminal portion through a separate ferrite. This eliminates the need for a separate ferrite from the connector housing and a structure for holding the ferrite, reduces the number of parts and the connector manufacturing process, and simplifies the structure of the connector housing.

Embodiments of the present invention will be described with reference to the drawings.
1 to 3 show a first embodiment of the present invention, in which a branch connector 10 forms a branch portion where a branch line branches from a main line in an in-vehicle LAN that performs CAN communication (differential transmission method). As shown in FIG. 1, a connector 30 (30 </ b> A, 30 </ b> B) connected to the end of a twisted pair electric wire 40 constituting a differential transmission line is fitted and connected.

  The connector housing 11 of the branch connector 10 is a resin molded product containing granular ferrite 13 that is a magnetic material. The resin used for the connector housing 11 is generally PBT (polybutylene terephthalate), SPS (syndiotactic polystyrene), or LCP (liquid crystal polyester), but may be nylon or the like. As shown in FIG. 2, the connector housing 11 has bus bar accommodating portions 11a extending in the left-right direction X on one side and arranged in two stages in the vertical direction Y, while four connectors are fitted on the other side. The part 11b is juxtaposed in the left-right direction X. The bus bar housing portion 11a and the connector fitting portion 11b are partitioned by a bottom wall 11c of the connector fitting portion 11b, and the bus bar housing portion 11a and the connector fitting portion 11b are spaced from each other in the left-right direction X by the bottom wall 11c. A terminal hole 11d communicating with is formed. A locking groove 11e for locking a connector 30 described later is provided at a required location on the inner surface of the connector fitting portion 11b.

The bus bar 20 accommodated in the bus bar accommodating portion 11a of the connector housing 11 includes a long joint portion 20a and a plurality of electric wire connecting terminal portions 20b protruding at intervals in the length direction of the joint portion 20a. .
The joint portion 20a of the bus bar 20 is accommodated in the bus bar accommodating portion 11a of the connector housing 11, while the electric wire connecting terminal portion 20b penetrates the terminal hole 11d of the connector housing 11 and the tip portion projects into the connector fitting portion 11b. I am letting. In this manner, in a state where the bus bar 20 is accommodated in the connector housing 11, the cover 12 is lock-coupled to one side of the connector housing 11 provided with the bus bar accommodating portion 11a, and the opening end of the bus bar accommodating portion 11a is closed. Yes.

  The connector housing 31 of the connector 30 fitted to the connector fitting portion 11b of the connector housing 11 is also a resin molded product containing granular ferrite 13 that is a magnetic material. The resin used for the connector housing 31 is generally PBT (polybutylene terephthalate), SPS (syndiotactic polystyrene), or LCP (liquid crystal polyester), but may be nylon or the like. As shown in FIG. 3, the connector housing 31 has two terminal accommodating chambers 31a arranged in the vertical direction Y, and is engaged with the connector fitting portion 11b of the branch connector 10 at a required position on the outer surface. A pawl 31b is projected. The connector 30 is connected to the terminal of the twisted pair electric wire 40 constituting the differential transmission line, and the terminal material connected to the terminal of the first communication line 41A (CAN_H) of the twisted pair electric wire 40 is provided in the upper terminal accommodating chamber 31a-1. While 42A is inserted and locked, the terminal material 42B connected to the terminal of the second communication line 41B (CAN_L) of the twisted pair electric wire 40 is inserted and locked in the lower terminal accommodating chamber 31a-2.

  In this embodiment, the connectors 30A and 30B connected to the terminals of the two pairs of twisted pair electric wires 40A constituting the trunk line of the communication circuit and the two sets of twisted pair electric wires 40B constituting the branch lines are used as the connector fitting portions 11b of the branch connector 10. Each is mated. At this time, the terminal materials 42A and 42B of the connector 30 are respectively male and female fitted and connected to the electric wire connecting terminal portion 20b of the bus bar 20 in the branch connector 10, and the first communication lines 41A of the twisted pair electric wires 40 and the second communication lines 41B. They are connected to each other via a bus bar 20.

According to the above configuration, the connector housings 11 and 31 of the branch connector 10 and the connector 30 connected to the branch connector 10 are formed of the resin containing the ferrite 13 that is a magnetic material. The integrally provided ferrite 13 absorbs the magnetic field generated in the vicinity of the branch connection portion and converts it into heat, so that the high frequency component increased due to the impedance mismatch of the branch connection portion can be reduced, and the transmission waveform generated at the branch connection portion Distortion can be improved.
In this way, since the connector housings 11 and 31 contain ferrite, the terminal material 42 connected to the trunk line or branch line in the vicinity of the branch connection portion and the wire connection terminal portion 20b of the bus bar 20 are passed through separate ferrite. There is no need. This eliminates the need for a separate ferrite from the connector housings 11, 31 and a structure for holding the ferrite in the connector housings 11, 31. The number of parts and the manufacturing process of the connector can be reduced. The structure can be simplified.

In this embodiment, ferrite is contained in the connector housings 11 and 31 of both the branch connector 10 and the connector 30 connected to the branch connector, but only one of the connector housings contains ferrite. Also good.
Further, ferrite may be contained only in the connector housing of the connector 30B connected to the branch line, and ferrite may not be contained in the connector housing of the connector 30A connected to the main line.
Furthermore, since the twisted pair electric wire 40 which comprises a differential transmission line is connected to the branch connector 10, the bus bar 20 is arrange | positioned in two steps in the connector housing 11, When connecting electric wires other than a pair electric wire The bus bar may be arranged on the connector housing 11 in one or more stages.

4 and 5 show a second embodiment of the present invention.
In the present embodiment, ferrite is not contained in the resin forming the connector housings 11 and 31 of the branch connector 10 and the connector 30 connected to the branch connector 10, and the connector fitting portion 11b of the connector housing 11 of the branch connector 10 is not included. In the connector housing 31 of the connector 30, the ferrite coating layers 14 and 32 are provided on the outer peripheral surface, respectively. The ferrite coating layer 14 is formed by applying paste-like ferrite by spraying.
In the connector housing 11, the ferrite coating layer 14 surrounds the entire outer periphery of the bus bar 20 around the axis of the wire connection terminal portion 20 a, and in the connector housing 31, the ferrite coating layer 32 covers the outer periphery of the terminal material 42 around the axis. Surrounds the entire circumference.

According to the above configuration, the ferrite coating layers 14 and 32 of the connector housings 11 and 31 surround the outer periphery of the wire connecting terminal portion 20a of the bus bar 20 and the terminal material 42. Can be improved.
As described above, since the ferrite coating layers 14 and 32 are integrally provided on the connector housings 11 and 31, a separate ferrite and a structure for holding the ferrite in the connector housings 11 and 31 are not required. In addition, the manufacturing process of the connector can be reduced, and the structure of the connector housings 11 and 31 can be simplified.
The ferrite coating layer may be provided only on the connector housing of the connector 30B connected to the branch line, and the ferrite coating layer may not be provided on the connector housing of the connector 30A connected to the trunk line.

6 and 7 show a modification of the second embodiment.
The ferrite coating layer 14 provided on the connector housing 11 of the branch connector 10 may be provided on the outer peripheral surface of the connector housing 11 as shown in FIG. 6 (A), or as shown in FIG. 6 (B). 11 may be provided on both the outer peripheral surface of 11 and the inner peripheral surface of the connector fitting portion 11b.

On the other hand, the ferrite coating layer 32 provided on the connector housing 31 of the connector 30 may be provided on the inner peripheral surface of the terminal accommodating chamber 31a as shown in FIG. 7A, or as shown in FIG. 7B. Further, it may be provided on both the outer peripheral surface of the connector housing 31 and the inner peripheral surface of the terminal accommodating chamber 31a.
Any one of the branch connector 10 and the connector 30 may be used in combination, or only one of the branch connector 10 and the connector 30 may be provided with a ferrite coating layer.
Furthermore, the ferrite coating layers 14 and 32 may be provided on the connector housings 11 and 31 formed of the resin containing the ferrite of the first embodiment.
In addition, since another structure and an effect are the same as that of 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The branch connector of the present invention is suitably used for communication circuits such as in-vehicle LANs, OA (Office Automation), and FA (Factory Automation).

It is drawing which shows the branch connector of 1st Embodiment of this invention, and the connector connected to this branch connector. It is sectional drawing of a branch connector. It is sectional drawing which shows the state which connected the connector to the branch connector. It is drawing which shows the branch connector of 2nd Embodiment, and the connector connected to this branch connector. It is sectional drawing which shows the state which connected the connector to the branch connector. (A) (B) is sectional drawing of the branch connector of the modification of 2nd Embodiment. (A) (B) is sectional drawing of the connector of the modification of 2nd Embodiment. It is drawing which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Branch connector 11 Connector housing 11a Bus bar accommodating part 11b Connector fitting part 13 Ferrite 14 Ferrite coating layer 20 Bus bar 20a Joint part 20b Electric wire connection terminal part 30 Connector 32 Ferrite coating layer

Claims (4)

A branch connector provided at a position where a branch line is branched and connected from a trunk line constituting a communication circuit,
A bus bar having a long joint portion and a plurality of terminal portions for electric wire connection projecting at an interval in the length direction of the joint portion;
A connector housing for accommodating the bus bar;
The branch connector is characterized in that the connector housing is formed of a resin containing ferrite, or a ferrite coating layer is provided on a wall surface of the connector housing made of a resin molded product.   The ferrite coating layer is provided on a wall surface of the connector housing including an outer peripheral surface of the connector housing and / or an inner peripheral surface of a connector fitting portion for fitting a connector connected to the branch line, and the ferrite coating layer The branch connector according to claim 1, wherein the branch connector is provided so as to surround the entire outer periphery around the axis of the electric wire connecting terminal portion of the bus bar. For the branch connector provided at the position where the branch line branches from the main line constituting the communication circuit, the connector connected to the main line and the branch line to be fitted and connected respectively.
One end is connected to the terminal of the trunk line or branch line, the other end is connected to the branch connector, the terminal material connected to the terminal portion for electric wire connection provided on the bus bar in the branch connector,
A connector housing for accommodating the terminal material;
A connector characterized in that the connector housing is molded from a resin containing ferrite, or a ferrite coating layer is provided on the wall surface of the connector housing made of a resin molded product.   The ferrite coating layer is provided on an outer peripheral surface of the connector housing and / or a wall surface of the connector housing formed of an inner peripheral surface of a terminal accommodating chamber for accommodating the terminal material, and the ferrite coating layer is formed of the terminal material. The connector according to claim 3, which is provided so as to surround the entire outer periphery around the axis.

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