JP2010061901A - Multiplex communication joint connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multiplex communication joint connector having improved wavy distortion to be transferred by preventing the deformation of a ferrite plate resulting from insert molding into a connector housing to suppress the characteristic deterioration of the multiplex communication joint connector due to the degradation of magnetic permeability. <P>SOLUTION: In the ferrite plate 30, a slit 34 is formed which is cut ranging from the outside face of the ferrite plate 30 to the inside. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a joint connector for multiple communication that can be fitted with a plurality of counterpart connectors.

  In vehicles and the like, connection using a multiplex communication joint connector is performed in order to control a plurality of electrical components by CAN (Control Area Network) communication. Such a signal transmission connector is required to have a function of removing noise superimposed on a signal in order to reduce adverse effects on noise radiation and signal transmission.

  Conventionally, as a connector having a noise removing function, a connector pin soldered to a disk-shaped through capacitor and accommodated in a housing is inserted into a through hole of a cylindrical ferrite core, and resin is placed in a rear peripheral wall of the housing. A connector device in which a cylindrical ferrite core is filled and fixed to a housing is disclosed (for example, see Patent Document 1).

Also known is a connector in which ferrite is assembled in a ferrite housing chamber formed in the housing, and a retaining member is disposed outside the ferrite so as to be held in the ferrite housing chamber so as to prevent ferrite damage during transportation. (For example, refer to Patent Document 2).
JP-A-6-76887 JP 2007-5132 A

  In recent years, in vehicles such as automobiles, as a function is complicated, it is a matter of concern to secure a space for arranging many devices, and there is a strong demand for miniaturization of connectors. In the connectors described in Patent Document 1 and Patent Document 2, a disk-shaped feedthrough capacitor and a retaining member must be arranged in the housing, which makes it difficult to reduce the size of the connector and requires assembly steps. There was a problem.

  On the other hand, there is a multiplex communication joint connector in which the ferrite is integrally formed with the connector housing to reduce the size of the connector and reduce the number of assembly steps. As shown in FIG. 6, the multiplex communication joint connector 10 is formed in a substantially rectangular plate shape with a connector housing 1 made of a synthetic resin having a plurality of connector fitting portions 2 and a plurality of through holes 4. And a connecting portion 5 in which a bus bar 6 and a pin-like contact 7 are integrally formed of a metal plate.

  The ferrite plate 3 in which the contact 7 is inserted into the through hole 4 is insert-molded integrally with the connector housing 1. However, when the ferrite plate 3 is insert-molded into the connector housing 1, bending stress acts on the plate-like ferrite plate 3 due to shrinkage of the synthetic resin after molding, and deformation such as warping may occur.

  When such stress that deforms acts on the ferrite plate 3, the magnetic permeability of the ferrite plate 3 decreases due to the inverse magnetostriction phenomenon generally known as the Villari effect. For this reason, the ferrite plate 3 cannot obtain sufficient impedance characteristics as a low-pass filter, and there is a problem that improvement of waveform distortion to be transmitted is insufficient. In addition, even if this barrier effect is taken into account, it is preferable to enlarge the ferrite plate 3 so that sufficient characteristics can be obtained, which leads to an increase in the cost of the joint connector 10 for multiplex communication and is an obstacle to downsizing. Absent.

  The present invention has been made in view of the above-mentioned circumstances, and its purpose is to reduce the deformation of the ferrite plate caused by the insert molding to the connector housing, and the characteristics of the joint connector for multiplex communication due to the decrease in permeability. An object of the present invention is to provide a miniaturized joint connector for multiplex communication that can suppress deterioration and improve transmitted waveform distortion.

In order to achieve the above-described object, the joint connector for multiplex communication according to the present invention is characterized by the following (1) to (2).
(1) a connector housing formed with a connector fitting portion for fitting with a mating connector;
Conductivity that is disposed in the connector housing so as to protrude into the connector fitting portion, and contacts and electrically connects to the mating terminal of the mating connector when the mating connector is fitted into the connector fitting portion. Members,
A ferrite plate insert-molded in the connector housing in a state of being penetrated by the conductive member;
With
The ferrite plate is formed with a slit cut inward from the outer surface of the ferrite plate.
(2) A multiplex communication joint connector configured as described in (1) above,
The connector housing has a plurality of connector fitting portions for fitting with a plurality of mating connectors,
The ferrite plate has a plurality of small ferrite portions separated by the slits so as to correspond to the connector fitting portions.

According to the multiplex communication joint connector of the above configuration (1), the ferrite plate penetrated by the conductive member is insert-molded in the connector housing, so that the connector is miniaturized and the assembly man-hour is reduced. Reduction is possible. Further, the stress acting on the ferrite plate due to the resin shrinkage after the insert molding is relieved by the slit, that is, relieved by the deformation of the ferrite plate around the slit.
According to the multiplex communication joint connector of the above configuration (2), the ferrite plate is formed by a plurality of small ferrite portions arranged at predetermined intervals corresponding to the connector fitting portions of the connector housing. Compared with the conventional multiplex communication joint connector in which multiple ferrite plates are placed at each connector mating part and insert molded, handling of the ferrite plates during insert molding is easier and production efficiency is greatly improved. be able to.

  According to the present invention, the connector can be miniaturized and the number of assembly steps can be reduced. Further, the stress acting on the ferrite plate due to the resin shrinkage after the insert molding is relieved by the slit, that is, relieved by the deformation of the ferrite plate around the slit. In addition, the ferrite plate can be easily handled during insert molding, and the production efficiency can be greatly improved.

  Embodiments of a joint connector for multiplex communication according to the present invention will be described below in detail with reference to the drawings.

  1 is a perspective view of a joint connector for multiplex communication according to the present invention, FIG. 2 is a front view of the joint connector for multiplex communication, FIG. 3 is a longitudinal sectional view taken along line AA in FIG. 2, and FIG. FIG. 5 is a perspective view of the ferrite plate, and FIG. 5 is a perspective view of the ferrite plate showing a state in which the ferrite connecting portion of the ferrite plate is damaged by resin stress.

  As shown in FIGS. 1 to 3, the joint connector 100 for multiplex communication of the present embodiment includes a connector housing 20 made of a synthetic resin having a plurality (eight in the embodiment shown in the drawings) connector fitting portions 21. A ferrite plate 30 provided with a plurality of through holes 31 and formed in a substantially rectangular plate shape is disposed in the connector housing 20 so as to protrude into the connector fitting portion 21, and the mating connector is connected to the connector fitting portion 21. And a conductive member 40 that contacts and electrically connects to the mating terminal of the mating connector when fitted to the mating connector.

  As shown in FIG. 4, the ferrite plate 30 connects a plurality of (eight in the embodiment shown in the figure) small ferrite portions 32 each having a pair of through holes 31 and adjacent small ferrite portions 32. The ferrite connecting portion 33 is integrally formed. The thickness t2 of the ferrite coupling portion 33 is smaller than the thickness t1 of the small ferrite portion 32, and can be damaged or deformed by resin stress due to insert molding described later. In other words, in the ferrite plate, a slit 34 cut inwardly from the outer surface of the ferrite plate is formed between the adjacent small ferrite portions 32.

  The small ferrite portion 32 is formed at a predetermined interval that matches the interval between adjacent connector fitting portions 21 of the connector housing 20, and is low-pass with respect to signal propagation in the conductive member 40 inserted through the through hole 31. It has a magnetic function such as a filter function. The small ferrite portions 32 of the ferrite plate 30 are insert-molded integrally with the connector housing 21 so as to face the bottom surfaces (not shown in FIG. 1) of the connector fitting portions 21 arranged in a row.

  The conductive member 40 includes a plurality of contact pins 41 (eight in the illustrated embodiment) formed in a pin shape, and a bus bar 42 that connects the plurality of contact pins 41 at one end, and is electrically conductive. It is integrally formed by the metal plate which has. A pair of contact pins 41 adjacent in the left-right direction are arranged so as to be inserted into the through hole 31 of the small ferrite portion 32 and protrude into the connector fitting portion 21. A pair of contact pins 41 arranged in each connector fitting portion 21 transmits a signal in accordance with a transmission method that realizes multiplex communication. For example, when frequency division multiplexing is adopted as a transmission method, a different frequency band is assigned to each of the pair of contact pins 41. When frequency division multiplexing is employed, a pair of contact pins 41 arranged in adjacent connector fitting portions 21 are subjected to electromagnetic waves (noise) generated when signals propagate through one pair of contact pins 41, while the other A voltage may be induced in the pair of contact pins 41. In order to prevent voltage induction due to noise, the ferrite plate 30 blocks the propagation of electromagnetic waves from the one pair of contact pins 41 to the other pair of contact pins 41.

  The ferrite plate 30 with the contact pins 41 of the pair of conductive members 40 inserted through the through holes 31 is held in an insert mold (not shown), filled with resin, and insert-molded together with the conductive members 40. A connector housing 20 is formed. As a result, the contact pins 41 are arranged so as to protrude into the respective connector fitting portions 21.

  Since the connector housing 20 molded with synthetic resin undergoes resin shrinkage after molding, stress due to resin shrinkage acts on the insert-molded ferrite plate 30. At this time, the ferrite connecting portion 33 is deformed due to the concentrated stress acting on the ferrite connecting portion 33 having a thin thickness t2 and a mechanical strength weaker than that of the other portion (small ferrite portion 32). Alternatively, the ferrite connecting portion 33 is cracked and divided into a plurality of small ferrite portions 32, and the stress acting on the small ferrite portions 32 is relaxed.

  Therefore, the decrease in the magnetic permeability of the ferrite plate 30 (small ferrite portion 32) due to the inverse magnetostriction phenomenon is reduced, the low-pass filter function (magnetic function) of the ferrite plate 30 can be maintained well, and the multiplex communication joint Waveform distortion transmitted through the connector 100 can be improved.

  Further, since the ferrite plate 30 before insert molding is a single part in which a plurality of small ferrite portions 32 and ferrite connecting portions 33 are integrally formed, the ferrite plate 30 is provided for each small ferrite portion 32. Compared to the case where the conductive member 40 is divided into a plurality of parts, the assembly work of inserting the contact pin 41 of the conductive member 40 into the through hole 31 is easy, and the number of assembly steps can be reduced.

  In addition, since the insert molding is performed in a state where the ferrite plate 30 and the conductive member 40 are assembled, the ferrite plate 30 and the conductive member 40 can be handled as one component, and the number of manufacturing steps can be reduced. Can do.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.

1 is a perspective view of a joint connector for multiplex communication according to the present invention. It is a front view of the joint connector for multiplex communication. It is a longitudinal cross-sectional view in the AA line of FIG. FIG. 4 is a perspective view of the ferrite plate shown in FIG. 3. It is a perspective view of the ferrite plate which shows the state where the ferrite connection part of a ferrite plate is damaged by the resin stress. It is a disassembled perspective view of the conventional multiplex communication joint connector.

Explanation of symbols

20 Connector housing 21 Connector fitting part 30 Ferrite plate 31 Through hole 32 Small ferrite part 33 Ferrite connection part 40 Conductive member 10 Joint connector for multiple communication t1 Thickness of small ferrite part t2 Thickness of ferrite connection part

Claims (2)

A connector housing formed with a connector fitting portion for mating with a mating connector;
Conductivity that is disposed in the connector housing so as to protrude into the connector fitting portion, and contacts and electrically connects to the mating terminal of the mating connector when the mating connector is fitted into the connector fitting portion. A member,
A ferrite plate insert-molded in the connector housing in a state of being penetrated by the conductive member;
With
The multiplex communication joint connector, wherein the ferrite plate is formed with a slit cut inwardly from the outer surface of the ferrite plate. The connector housing has a plurality of connector fitting portions for fitting with a plurality of mating connectors,
2. The joint connector for multiplex communication according to claim 1, wherein the ferrite plate has a plurality of small ferrite portions separated by the slits so as to correspond to the connector fitting portions.

Images