JP5489352B2 - Multiple communication joint connector - Google Patents

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 removal function, a low-pass filter built-in connector in which a low-pass filter circuit composed of a ferrite magnetic core and a chip capacitor is built in the connector has been disclosed (for example, see Patent Document 1).

  Also known is a multiplex communication joint connector comprising an outer housing, a chain bus bar as a joint circuit formed integrally with a metal plate, and a termination resistor circuit having first and second resistors and capacitors. (For example, refer to Patent Document 2).

JP-A-7-78658 JP 2003-123918 A JP 2010-33961 A

  A conventional multiplex communication joint connector 10 shown in FIG. 12 includes a synthetic resin outer housing 1 having a plurality of connector fitting portions 2 and a ferrite plate formed with a plurality of through holes 4 and formed into a rectangular plate shape. The plate 3, the bus bar 6, and the pin-like terminal 7 are provided with a connection portion 5 formed integrally with a metal plate. The ferrite plate 3 that functions as a low-pass filter is insert-molded integrally with the outer housing 1, and the terminal 7 of the connection portion 5 is inserted into the through hole 4 of the ferrite plate 3 and disposed in the connector fitting portion 2. Has been. With this configuration, a part of the ferrite plate 3 is located between the terminals 7 adjacent to each other in the vertical and horizontal directions.

  However, when the ferrite plate 3 is insert-molded into the outer housing 1, bending stress acts on the plate-shaped ferrite plate 3 due to shrinkage of the molded synthetic resin, and deformation such as warping occurs as shown in FIG. There is a case. 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, it is not preferable to increase the size of the ferrite plate 3 so that sufficient characteristics can be obtained in consideration of the barrier effect, because this causes a cost increase of the joint connector 10 for multiplex communication.

  Therefore, if the ferrite plate is divided into multiple pieces and placed in the outer housing, even if the resin in the outer housing shrinks, the stress acting on each ferrite plate is small and the deformation of the ferrite plate is greatly reduced. Suppression is also under consideration (see the exploded perspective view of the joint connector for multiplex communication shown in FIG. 14 in which the ferrite plate is divided).

  By the way, the impedance characteristic required for a ferrite plate is the number of joint connectors for multiplex communication through which the ferrite plate is subject to low-pass filter action (hereinafter, the wiring connecting between electronic devices is multiplexed). The number passing through the communication joint connector is referred to as “the total number of joint connectors for multiplex communication”), and how many wires can be connected to the multiplex communication joint connector that accommodates the ferrite plate (hereinafter, referred to as “multiple communication joint connectors”). The number of wires that can be connected to a certain multiplex communication joint connector is referred to as “the number of branches”). This point will be described with reference to a schematic diagram of wiring for connecting electronic devices via a multiplex communication joint connector shown in FIG. FIG. 15A is a schematic diagram of wiring with a total number of joint connectors for multiplex communication of 3 and a branch number of 8. FIG. 15B shows a total number of joint connectors for multiplex communication of 2 and a number of branches of 11. It is a schematic diagram of a certain wiring.

  In a general vehicle communication system, there are about 20 electronic devices 50 used in a system (system such as an air conditioner, ABS (Antilock Brake System), AV device, etc.) driven by the vehicle communication system. The devices 50 are connected via the multiplex communication joint connector 10. Considering the number of the electronic devices 50, the total number of multiplex communication joint connectors in FIG. 15A is 3 and the number of branches is 8, and the total number of multiplex communication joint connectors in FIG. A wiring having a number of 11 is conceivable.

  In the wiring shown in FIG. 15A, among the wirings connecting between certain electronic devices 50, there are those that pass through the three multiplex communication joint connectors 10. As the number of multiplex communication joint connectors that pass through increases, the signal that propagates through the wiring attenuates more. Therefore, when there are a large number of multiplex communication joint connectors that pass through, The ferrite plate to be accommodated is required to have a relatively low impedance characteristic. On the other hand, when the wiring for connecting certain electronic devices 50 is limited to those via two multiplex communication joint connectors 10 as shown in FIG. 15B, these multiplex communication joint connectors are used. Is required to have relatively high impedance characteristics. In this way, the impedance characteristics required for the ferrite plate are the desired numerical values according to the total number of joint connectors for multiplex communication and the number of branches of the joint connector for multiplex communication for which the ferrite plate is subject to low-pass filter action. It is necessary to adjust to.

  However, in order to use a connector with a desired impedance characteristic as described above for a joint connector for multiplex communication, various ferrite plates with different impedance characteristics are manufactured, and wiring is made from these ferrite plates. It is necessary to apply to the joint connector for multiplex communication (for example, Patent Document 3). For this reason, the time required to design the ferrite plate and the joint connector for multiplex communication to which the ferrite plate is applied is increased, and the number of ferrite plate and joint connector for multiplex communication is increased, so that the management of them is reduced. It becomes more complicated. As a result, the price of the joint connector for multiplex communication is also increased.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a multiplex communication joint connector capable of adjusting the impedance characteristic of a ferrite plate to a desired value.

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 (4).
(1) An outer housing in which a plurality of connector fitting portions for fitting with a plurality of mating connectors are formed,
A terminal that is disposed in the outer housing so as to protrude into the connector fitting portion, and that contacts and electrically connects to a counterpart terminal of the counterpart connector when the counterpart connector is fitted to the connector fitting portion; ,
A ferrite plate disposed in the outer housing to be penetrated by the terminals;
An inner housing having a plate accommodating chamber in which one surface is opened and the ferrite plate is accommodated through the opening;
With
The outer housing is formed with an inner housing fitting portion for fitting the inner housing in which the ferrite plate is housed in the plate housing chamber,
The inner housing holds the terminals so that the inner housing protrudes into the connector fitting portion when the inner housing is fitted into the inner housing fitting portion, and the plate housing chamber is inserted. The impedance characteristic of the ferrite plate is adjusted to a desired numerical value by pressing the ferrite plate, the inner side of which defines the plate accommodating chamber being penetrated by the terminal, from the side surface.
about.
(2) A multiplex communication joint connector configured as described in (1) above,
The inner housing presses a part of the ferrite plate from which the inner surface defining the plate housing chamber is penetrated by the terminal,
about.
(3) A joint connector for multiplex communication configured as described in (2) above,
The ferrite plate is divided into a plurality corresponding to the connector fitting portion,
In the inner housing, the impedance characteristics of each of the ferrite plates are adjusted to a desired numerical value by pressing the ferrite plates each having an inner surface defining the plate housing chamber penetrated by the terminals. ing,
about.
(4) A joint connector for multiplex communication configured as described in (3) above,
The inner housing is provided with a plurality of spring members at positions facing the side surfaces of the ferrite plates on the inner side surface defining the plate housing chamber,
Each of the spring members presses the ferrite plate penetrated by the terminal from its side surface,
about.

  According to the multiplex communication joint connector configured as described above in (1) to (4), the impedance characteristic of the ferrite plate can be adjusted to a desired value.

  According to the multiplex communication joint connector of the present invention, the impedance characteristic of the ferrite plate can be adjusted to a desired value. As a result, the number of ferrite plate parts can be reduced.

  The present invention has been briefly described above. Further, details of the present invention will be further clarified by reading through the modes for carrying out the invention described below with reference to the accompanying drawings.

1 is an exploded perspective view of a multiplex communication joint connector according to a first embodiment of the present invention. It is a cross-sectional view of the outer housing of the multiplex communication joint connector according to the first embodiment of the present invention. It is a perspective view of the inner housing of the joint connector for multiplex communication concerning a 1st embodiment of the present invention. FIG. 4 is a perspective view illustrating a state in which the ferrite plate is attached to the inner housing in FIG. FIG. 4 is a perspective view showing a state in which the ferrite plate is attached to the inner housing in FIG. It is a cross-sectional top view which shows the fitting structure of the inner housing and outer housing of the multiplex communication joint connector which concern on 1st Embodiment of this invention. It is a disassembled perspective view of the joint connector for multiplex communication which concerns on 2nd Embodiment of this invention. It is a perspective view of the inner housing of the joint connector for multiplex communication which concerns on 2nd Embodiment of this invention. FIG. 9 is a perspective view illustrating a state in which the ferrite plate is attached to the inner housing in FIG. It is a disassembled perspective view of the joint connector for multiplex communication which concerns on 3rd Embodiment of this invention. It is a perspective view which cuts in part and shows the mounting condition of the ferrite plate with respect to the inner housing of the joint connector for multiplex communication which concerns on 3rd Embodiment of this invention. It is a disassembled perspective view of the conventional multiplex communication joint connector. FIG. 13 is a side view showing a deformed state of the insert-molded ferrite plate shown in FIG. 12. It is a disassembled perspective view of the joint connector for multiplex communication by which the ferrite plate was divided | segmented. It is a schematic diagram of the wiring which connects between electronic devices via the joint connector for multiplex communication. FIG. 15A is a schematic diagram of wiring with a total number of joint connectors for multiplex communication of 3 and a branch number of 8. FIG. 15B shows a total number of joint connectors for multiplex communication of 2 and a number of branches of 11. It is a schematic diagram of a certain wiring.

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

(First embodiment)
A joint connector for multiplex communication according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an exploded perspective view of a joint connector for multiplex communication according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the outer housing of the multiplex communication joint connector according to the first embodiment of the present invention. FIG. 3 is a perspective view of the inner housing of the joint connector for multiplex communication according to the first embodiment of the present invention. FIG. 4 is a perspective view showing a state in which the ferrite plate is attached to the inner housing in FIG. FIG. 5 is a perspective view showing a state where the ferrite plate is attached to the inner housing in FIG. FIG. 6 is a cross-sectional plan view showing a fitting structure between the inner housing and the outer housing of the multiplex communication joint connector according to the first embodiment of the present invention.

  In the first embodiment, in the inner housing 42, the ferrite plate is pressed using the resin spring 41, which is a spring member, formed on the side wall 42b of the plate housing chamber 42e, and the impedance characteristic of the ferrite plate is set to a desired value. The value is adjusted (see FIG. 5). Details of the support structure of the ferrite plate by the resin spring will be described later.

  As shown in FIG. 1, the multiplex communication joint connector 200 of the first embodiment has a plurality of connector fitting portions 22 (eight in FIG. 1) for fitting with a plurality of counterpart connectors (not shown). An outer housing 21 made of synthetic resin, a substantially rectangular plate-like ferrite plate 23 provided with eight pairs of through-holes 24, a connector fitting portion 22, and a mating connector fitted into the connector. A pair of connecting portions 25 that are in contact with and electrically connected to the mating terminal of the mating connector when fitted to the portion 22, and an inner housing 42 that holds the connecting portion 25 and accommodates the ferrite plate 23. Prepare.

  The connecting portion 25 includes a plurality of terminals 27 formed in a pin shape (eight in each row in FIG. 1) and bus bars 26 (two in FIG. 1) connected to one end of the plurality of terminals 27. Have. In FIG. 1, two bus bars 26 each having eight terminals 27 are arranged in parallel. When the inner housing 42 is fitted to the outer housing 21, the pair of terminals 27 adjacent to each other in the left-right direction are inserted into the connector fitting portion 22 from the side opposite to the side where the mating connector is fitted to the connector fitting portion 22. It is arranged in one connector fitting part 22 so that it may protrude. A pair of terminals 27 arranged in each connector fitting portion 22 transmits a signal in accordance with a transmission method that realizes multiplex communication. For example, when frequency division multiplexing is employed as a transmission method, a different frequency band is assigned to each of the pair of terminals 27. When frequency division multiplexing is employed, the pair of terminals 27 arranged in the adjacent connector fitting portions 22 is caused by electromagnetic waves (noise) generated when a signal propagates through one of the pair of terminals 27. A voltage may be induced on the other side of 27. In order to prevent voltage induction due to noise, the ferrite plate 23 blocks the propagation of electromagnetic waves from one of the pair of terminals 27 to the other of the pair of terminals 27.

  In the case where a multiplex communication joint connector is used for CAN, in a transmission line in which a differential signal is input to a pair of terminals 27, an H-side signal line connected to one pair of terminals 27 and the other pair. It is essential to maintain the balance of impedance between the L side signal lines connected to the terminal 27 (H side signal line impedance characteristics≈L side signal line impedance characteristics). For this reason, it is also essential that the ferrite plate 23 positioned between the H-side signal line and the L-side signal line keeps the impedance balance between the H-side signal line and the L-side signal line.

  According to the shape of the ferrite plate 23 shown in FIG. 1, the ferrite plate 23 having uniform impedance characteristics is located between the eight pairs of terminals 27. As a result, waveform distortion transmitted through the multiplex communication joint connector can be improved.

  As shown in FIG. 2, the outer housing 21 has side walls 21b, 21d and side walls 21c, 21e perpendicular to the middle wall 21a on both sides of the middle wall 21a, and the middle wall 21a, side wall 21b, 21c, 21d, and 21e are H-shaped when the middle wall 21a is viewed in the horizontal direction. In the cross-sectional view of the outer housing of FIG. 2, a space surrounded by the middle wall 21a and the side walls 21b, 21c is an inner housing fitting portion 21g. The inner housing fitting portion 21g has an opening 21f, and the inner housing 42 is fitted through the opening 21f. On the other hand, a space surrounded by the middle wall 21a and the side walls 21d and 21e is a connector fitting portion 22. The connector fitting part 22 has an opening 21h, and the mating connector is inserted through the opening 21h.

  Further, terminal insertion holes 37 are formed in the middle wall 21 a at positions facing the through holes 24 of the ferrite plate 23. The terminal insertion hole 37 is penetrated by the terminal 27 that penetrates the through hole 24 of the ferrite plate 23 when the inner housing 42 is fitted into the inner housing fitting portion 21g. Thereby, when the inner housing 42 is fitted to the outer housing 21, a part of the terminal 27 penetrates the terminal insertion hole 37 from the inner housing fitting portion 21 g side and is disposed in the connector fitting portion 22. It will be.

  As shown in FIG. 3, the inner housing 42 is open at one surface, and a plate accommodation chamber 42e for accommodating the ferrite plate 23 is formed through the opening 42d. The plate accommodation chamber 42e is surrounded by a bottom wall 42a and side walls 42b and 42c. One side wall 42b of the side walls has a longitudinal direction of the inner housing 42 (that is, when the ferrite plate 23 is accommodated in the plate accommodating chamber 42e, on the inner surface thereof facing the accommodated ferrite plate 23. A resin spring 41 extending along the longitudinal direction of the ferrite plate 23 is formed. The resin spring 41 presses the side surface of the ferrite plate 23 accommodated in the plate accommodating chamber 42e toward the side wall 42c opposite to the side wall 42b on which the resin spring 41 is formed. With this resin spring 41, one side of the ferrite plate 23 is pressed against the resin spring 41 as shown in FIG. 5, and the other side faces the side of the plate housing chamber 42e where the resin spring 41 is provided. It is pressed so as to be pressed against the inner surface of the side wall 42c. The resin spring 41 as a spring member is formed by cutting one surface out of the inner surface of the plate housing chamber 42e.

  Next, with reference to FIG. 4 and FIG. 5, a process of attaching the ferrite plate 23 to the inner housing 42 will be described. FIG. 4 shows a state immediately before the through holes 24 of the ferrite plate 23 are inserted through the eight sets 16 terminals 27 attached to the inner housing 42 of FIG. Prior to this state, it is necessary to attach the connecting portion 25 to the bottom wall 42a of the plate housing chamber 42e (more specifically, the bottom wall 42a so as to penetrate the bottom wall 42a of the plate housing chamber 42e). The bus bar 26 in which one end of the terminal 27 is connected is inserted into and fixed to the terminal holding portion 43 formed in (1). As a result, each terminal 27 protrudes from the bottom wall 42a of the plate accommodating chamber 42e so as to extend straight toward the opening 42d. In the ferrite plate 23, the through hole 24 is inserted by the tip of the terminal 27, passes through the opening 42 d, and one surface in the thickness direction (the bottom surface of the ferrite plate 23 in the drawing) is in contact with the bottom wall 42 a. Thus, it is accommodated in the plate accommodating chamber 42e.

  In a state where the ferrite plate 23 is accommodated in the plate accommodating chamber 42e, one side in the width direction is pressed by the one resin spring 41 protruding inward of the side wall 42b as described above, while the other in the width direction. Is held in the plate accommodating chamber 42e so as to be pressed against the inner surface of the side wall 42c.

  The inner housing 42 in which the ferrite plate 23 is held in the plate accommodating chamber 42e as described above is fitted into the inner housing fitting portion 21g of the outer housing 21 shown in FIG. A state in which the inner housing 42 is fitted to the inner housing fitting portion 21g of the outer housing 21 is shown in FIG. The inner housing 42 is accommodated in the inner housing fitting portion 21g so that one surface of the ferrite plate 23 exposed from the opening 42d of the plate accommodating chamber 42e faces the inner surface Q of the inner wall 21a of the outer housing 21.

  As described above, in the first embodiment, the impedance characteristic of the ferrite plate can be adjusted by pressing the ferrite plate using the resin spring 41 that is a spring member in the inner housing 42. For example, when the impedance characteristic of a ferrite plate having high versatility is higher than a desired value, the ferrite pressed by the resin spring 41 by raising the resin spring 41 higher and increasing the pressing force・ Decrease the impedance characteristics of the plate. On the other hand, if the impedance characteristic of the highly versatile ferrite plate is close to a desired value, the resin spring 41 is slightly raised so that the pressing force is such that the ferrite plate does not fall out of the plate accommodating chamber 42e. By weakening, the impedance characteristic of the ferrite plate pressed by the resin spring 41 is not deteriorated. As a result, a highly versatile ferrite plate can be used for various multiplex communication joint connectors having different required impedance characteristics.

  In the above-described multiplex communication joint connector 200 described with reference to FIGS. 1 to 6, the resin spring 41 is formed by raising one of the inner surfaces of the plate housing chamber 42 e. The structure for pressing the ferrite plate 23 is not limited to this resin spring. A structure may be employed in which an insulating member is provided on the inner surface of the plate accommodation chamber 42e, and when the ferrite plate 23 is accommodated in the plate accommodation chamber 42e, the accumulated insulation member presses the ferrite plate 23. Further, the structure in which the resin spring 41 is formed on one side wall 42b of the plate accommodation chamber 42e has been described. However, the resin spring is formed on both side walls 42b and 42c of the plate accommodation chamber 42e, and the ferrite plate is formed by these resin springs. The structure which presses 23 may be sufficient.

  Further, in the above-described multiplex communication joint connector 200 described with reference to FIGS. 1 to 6, the resin spring 41 is provided on the side wall 42b of the plate accommodating chamber 42e, and the resin spring 41 presses the width direction of the ferrite plate 23. The structure is The location where the resin spring 41 is provided is not limited to the side walls 42b and 42c of the plate accommodation chamber 42e facing the side surface of the ferrite plate 23 positioned in the width direction. A structure may be employed in which the resin spring 41 presses the longitudinal direction of the ferrite plate 23 provided on the side wall of the plate accommodating chamber 42e facing the side surface located in the longitudinal direction of the ferrite plate 23.

  Further, a tip-shaped (for example, conical or pyramidal) protrusion protruding toward the ferrite plate 23 is provided on the bottom wall 42a of the plate housing chamber 42e, and the inner housing 42 is provided on the inner housing fitting portion 21g of the outer housing 21. When fitted, the protrusion may sandwich the ferrite plate 23 together with the inner surface Q of the inner wall 21a of the outer housing 21 and press the thickness direction of the ferrite plate 23. At this time, the protrusion extends along the longitudinal direction of the inner housing 42 (that is, the longitudinal direction of the ferrite plate 23 when the ferrite plate 23 is accommodated in the plate accommodation chamber 42e). 42a is formed.

  Furthermore, a tip-shaped (for example, conical or pyramidal) protrusion protruding toward the ferrite plate 23 is provided on the inner surface Q of the inner wall 21a of the outer housing 21, and the inner housing 42 is an inner housing fitting portion of the outer housing 21. It is also possible to adopt a structure in which the protrusion sandwiches the ferrite plate 23 together with the bottom wall 42a of the plate housing chamber 42e and presses the thickness direction of the ferrite plate 23 when fitted to 21g. At this time, the protrusion extends along the longitudinal direction of the outer housing 21 (that is, the longitudinal direction of the ferrite plate 23 when the inner housing 42 is fitted to the inner housing fitting portion 21g of the outer housing 21). And formed on the inner surface Q of the middle wall 21a.

  As described above, the protrusion is formed so as to protrude from the inner side surface of the plate housing chamber 42e or the inner surface Q of the inner wall 21a of the outer housing 21, and the ferrite plate is pressed from multiple directions. Therefore, it is easy to adjust the impedance characteristic of the ferrite plate to a desired value.

  By the way, the multiplex communication joint connector 200 described so far has a protruding portion (resin spring 41 or protrusion) formed so as to protrude from the inner surface of the plate housing chamber 42e or the inner surface Q of the inner wall 21a of the outer housing 21. The ferrite plate 23 is pressed. It is also possible to press the ferrite plate 23 without forming such a protrusion.

  That is, when manufacturing a multiplex communication joint connector, the ferrite plate may be insert-molded in the process of creating the housing. In this process, the flow rate of the resin poured into the mold is adjusted to By applying pressure from the resin to the ferrite plate so that the impedance characteristic becomes a desired value and solidifying the resin in this state, the ferrite plate can be held in the housing in a pressed state. If the joint connector for multiplex communication is manufactured in this way, a protruding portion that protrudes from the inner side surface of the plate housing chamber 42e or the inner surface Q of the inner wall 21a of the outer housing 21 is not formed. As described above, according to the present invention, the impedance characteristic of the ferrite plate can be set to a desired numerical value as long as the inner side surface of the plate accommodation chamber for accommodating the ferrite plate presses the ferrite plate from the side surface. Can be adjusted.

(Second Embodiment)
Next, a multiplex communication joint connector according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 7 is an exploded perspective view of the joint connector for multiplex communication according to the second embodiment of the present invention. FIG. 8 is a perspective view of the inner housing of the joint connector for multiplex communication according to the second embodiment of the present invention. FIG. 9 is a perspective view of the ferrite plate mounted on the inner housing in FIG. The same members as those described in the first embodiment are the same as those described in the first embodiment, and thus the description thereof is omitted.

  The multiplex communication joint connector 210 according to the second embodiment of the present invention is different from that described in the first embodiment in that the inside of the plate accommodation chamber 42e facing the ferrite plate 23 accommodating the ferrite plate 23. A plurality of resin springs 41b are formed on the side surface.

  As shown in FIG. 8, one surface of the inner housing 42 is opened, and a plate housing chamber 42e for housing the ferrite plate 23 is formed through the opening 42d. The plate accommodation chamber 42e is surrounded by a bottom wall 42a and side walls 42b and 42c. A plurality of resin springs 41 b are formed on one side wall 42 b of the side walls on the inner surface thereof facing the accommodated ferrite plate 23. The resin spring 41b presses the side surface of the ferrite plate 23 accommodated in the plate accommodation chamber 42e toward the side wall 42c opposite to the side wall 42b on which the resin spring 41b is formed. These resin springs 41 b have the same shape and the same size, and eight are arranged at equal intervals in the longitudinal direction of the inner housing 42. One side of the ferrite plate 23 is pressed by each of the resin springs 41b, and the other side is pressed against the inner side of the side wall 42c facing the side of the plate housing chamber 42e where the resin spring 41b is provided. Pressed in the same manner. The resin spring 41b as a spring member is formed by raising a part of one of the inner surfaces of the plate housing chamber 42e.

  The joint connector for multiplex communication 200 according to the first embodiment of the present invention has a structure that presses the side surface in the width direction of the ferrite plate 23 along its longitudinal direction. Thereby, the impedance characteristic of the ferrite plate 23 can be adjusted uniformly in the longitudinal direction. On the other hand, it may be desired to locally adjust the impedance characteristics of the ferrite plate 23 near a certain pair of terminals 27. The multiplex communication joint connector 210 according to the second embodiment of the present invention is useful when the impedance characteristic of the ferrite plate 23 is locally adjusted.

  That is, the impedance characteristic of the ferrite plate 23 can be reduced in the vicinity where each resin spring 41b is pressed, and the decrease in the impedance characteristic of the ferrite plate 23 is small in the vicinity where the resin spring 41b is not pressed. When wiring passing through a certain pair of terminals 27 passes through a large number of joint connectors for multiplex communication 200, it is required to locally lower the impedance characteristics of the ferrite plate 23 in the vicinity of the pair of terminals 27. In such a case, in order to press the ferrite plate 23 near the pair of terminals 27, a resin spring 41b is formed at a position adjacent to the pair of terminals 27 on the inner side surface of the plate accommodating chamber 42e. In the multiplex communication joint connector 210 according to the second embodiment of the present invention shown in FIGS. 7 to 8, eight resin springs 41 b having the same shape and the same size are arranged at equal intervals in the longitudinal direction of the inner housing 42. However, the shape of the resin spring 41b may be deformed according to the required impedance characteristics, and the location where the resin spring 41b is provided may be changed according to the location where the impedance characteristics are to be adjusted.

  In the above-described multiplex communication joint connector 210 described with reference to FIGS. 7 to 9, the resin spring 41b is formed by cutting one of the inner side surfaces of the plate housing chamber 42e. The structure for pressing the ferrite plate 23 is not limited to this resin spring. A structure may be employed in which an insulating member is provided on the inner surface of the plate accommodation chamber 42e, and when the ferrite plate 23 is accommodated in the plate accommodation chamber 42e, the accumulated insulation member presses the ferrite plate 23. The structure in which the resin spring 41b is formed on one side wall 42b of the plate accommodation chamber 42e has been described. However, the resin spring is formed on both side walls 42b and 42c of the plate accommodation chamber 42e, and the ferrite plate is formed by these resin springs. The structure which presses 23 may be sufficient.

  In the above-described multiplex communication joint connector 210 described with reference to FIGS. 7 to 9, the resin spring 41b is provided on the side wall 42b of the plate housing chamber 42e, and the resin spring 41b presses the width direction of the ferrite plate 23. The structure is The location where the resin spring 41b is provided is not limited to the side walls 42b and 42c of the plate accommodation chamber 42e facing the side surface located in the width direction of the ferrite plate 23. A structure in which the resin spring 41b presses the longitudinal direction of the ferrite plate 23 may be provided on the side wall of the plate accommodating chamber 42e facing the side surface located in the longitudinal direction of the ferrite plate 23.

  Further, a tip-shaped (for example, conical or pyramidal) protrusion protruding toward the ferrite plate 23 is provided on the bottom wall 42a of the plate housing chamber 42e, and the inner housing 42 is provided on the inner housing fitting portion 21g of the outer housing 21. When fitted, the protrusion may sandwich the ferrite plate 23 together with the inner surface Q of the inner wall 21a of the outer housing 21 and press the thickness direction of the ferrite plate 23. At this time, the protrusion is provided on the bottom wall 42a of the plate accommodating chamber 42e in accordance with a location where the impedance characteristic of the ferrite plate 23 is to be locally adjusted.

  Furthermore, a tip-shaped (for example, conical or pyramidal) protrusion protruding toward the ferrite plate 23 is provided on the inner surface Q of the inner wall 21a of the outer housing 21, and the inner housing 42 is an inner housing fitting portion of the outer housing 21. It is also possible to adopt a structure in which the protrusion sandwiches the ferrite plate 23 together with the bottom wall 42a of the plate housing chamber 42e and presses the thickness direction of the ferrite plate 23 when fitted to 21g. At this time, the protrusion is formed on the inner surface Q of the inner wall 21a in accordance with the location where the impedance characteristic of the ferrite plate 23 is to be adjusted locally.

  In this way, by forming a protruding portion protruding on the inner surface Q of the plate housing chamber 42e or the inner wall Q of the inner wall 21a of the outer housing 21 at an appropriate position, the ferrite plate 23 is pressed from multiple directions. Since the impedance characteristic of the ferrite plate 23 can be greatly reduced locally, it is easy to adjust the impedance characteristic of the ferrite plate 23 to a desired value.

(Third embodiment)
Next, a multiplex communication joint connector according to a third embodiment of the present invention will be described with reference to FIGS. FIG. 10 is an exploded perspective view of the multiplex communication joint connector according to the third embodiment of the present invention. FIG. 11 is a perspective view showing a part of the mounting state of the ferrite plate in the inner housing of the multiplex communication joint connector according to the third embodiment of the present invention. The same members as those described in the first embodiment or the second embodiment are the same as those described in the first embodiment or the second embodiment, and thus description thereof is omitted.

  The joint connector 220 for multiplex communication according to the third embodiment of the present invention is different from that described in the second embodiment in that the ferrite plate 23b is divided into a plurality of parts. The ferrite plate 23b is provided with a pair of through holes 24 and is divided into a substantially rectangular plate shape. In FIG. 10 and FIG. 11, it is divided into eight. In this structure, a separate ferrite plate 23 b is attached to each of the pair of terminals 27. In the case of this structure, one type of ferrite plate 23b is attached to the inner housing 42 in total.

  The multiplex communication joint connector 210 according to the second embodiment of the present invention has a structure that locally presses the side surface in the width direction of the ferrite plate 23. Thereby, the impedance characteristic of the ferrite plate 23 can be adjusted locally. On the other hand, the multiplex communication joint connector 220 according to the third embodiment of the present invention has a structure in which one resin spring 41b presses the side surface in the width direction of each of the ferrite plates 23b. With this structure, since only one resin spring 41b located on the side surface of the ferrite plate 23b is pressed against the ferrite plate 23b attached to a pair of terminals 27, each ferrite plate 23b is It can be pressed independently. As a result, the impedance of the ferrite plate 23b is changed by changing the shape of the resin spring 41b located on the side surface of the ferrite plate 23b in accordance with the impedance characteristics of the ferrite plate 23b required for each of the pair of terminals 27. The characteristic can be adjusted to a desired numerical value. Furthermore, since there is no resin spring 41b that presses the ferrite plate 23b in addition to the resin spring 41b located on the side surface of a certain ferrite plate 23b, it is easy to calculate the external force acting on the ferrite plate 23b. The design of the shape of the resin spring 41b is facilitated.

  In the above-described joint connector for multiplex communication 220 described with reference to FIGS. 10 to 11, the resin spring 41b is formed by cutting up one of the inner surfaces of the plate housing chamber 42e. The structure for pressing each of the ferrite plates 23b is not limited to this resin spring. An insulating member is provided on the inner surface of the plate housing chamber 42e, and when the ferrite plate 23b is housed in the plate housing chamber 42e, the built-up insulating member may press each of the ferrite plates 23b. . The structure in which the resin spring 41b is formed on one side wall 42b of the plate accommodation chamber 42e has been described. However, the resin spring is formed on both side walls 42b and 42c of the plate accommodation chamber 42e, and the ferrite plate is formed by these resin springs. The structure which presses 23b may be sufficient.

  Further, in the above-described multiplex communication joint connector 220 described with reference to FIGS. 10 to 11, the resin spring 41b is provided on the side wall 42b of the plate housing chamber 42e, and the resin spring 41b presses the width direction of the ferrite plate 23b. The structure is The place where the resin spring 41b is provided is not limited to the side walls 42b and 42c of the plate accommodation chamber 42e facing the side surface located in the width direction of the ferrite plate 23b. A partition wall for partitioning the ferrite plates 23b is newly provided between the adjacent ferrite plates 23b, and resin springs are provided on the side walls of the plate housing chamber 42e facing the partition walls and the side surfaces of the ferrite plates 23b in the longitudinal direction. 41b may be provided, and these resin springs 41b may press the longitudinal direction of the ferrite plate 23b.

  Furthermore, a tip-shaped (for example, conical or pyramidal) protrusion protruding toward each of the ferrite plates 23b is provided on the bottom wall 42a of the plate accommodating chamber 42e, and the inner housing 42 is an inner housing fitting portion 21g of the outer housing 21. The protrusion may sandwich the ferrite plate 23b together with the inner surface Q of the inner wall 21a of the outer housing 21 and press in the thickness direction of the ferrite plate 23b. At this time, the protrusion is provided on the bottom wall 42a of the plate accommodating chamber 42e so as to protrude toward the ferrite plate 23b whose impedance characteristics are to be adjusted.

  Further, a tip-shaped projection (for example, a cone shape or a pyramid shape) projecting toward each of the ferrite plates 23 b is provided on the inner surface Q of the inner wall 21 a of the outer housing 21, and the inner housing 42 is fitted to the inner housing of the outer housing 21. It is good also as a structure where a protrusion clamps each ferrite plate 23 with the bottom wall 42a of the plate accommodating chamber 42e, and presses the thickness direction of the ferrite plate 23 when it fits in the part 21g. At this time, the protrusion is formed on the inner surface Q of the inner wall 21a so as to protrude toward the ferrite plate 23 whose impedance characteristic is to be adjusted.

  In this way, by forming a protruding portion protruding on the inner surface Q of the plate housing chamber 42e or the inner wall Q of the inner wall 21a of the outer housing 21 at an appropriate position, the ferrite plate 23b is pressed from multiple directions. Since the impedance characteristic of the ferrite plate 23b can be greatly reduced, it is easy to adjust the impedance characteristic of the ferrite plate 23b to a desired value.

  As described above from the first embodiment to the third embodiment, according to the multiplex communication joint connector according to the present invention, the shape of the inner surface of the plate housing chamber for housing the ferrite plate is adjusted as appropriate. By changing the pressing force with which the inner surface presses the ferrite plate, the impedance characteristics required of the ferrite plate can be adjusted to a desired value, so that the ferrite plate can be adjusted without increasing the number of ferrite plate parts. -The impedance characteristic of the plate can be adjusted to a desired value.

21 Outer housing 21a Middle wall 21b, 21c, 21d, 21e Side wall 21f Opening 21g Inner housing fitting part 21h Opening 22 Connector fitting part 23, 23b Ferrite plate 24 Through hole 25 Connection part 26 Bus bar 27 Terminal 41, 41b Resin spring 42 Inner housing 42a Bottom wall 42b, 42c Side wall 42d Opening 42e Plate housing chamber Q Inner wall inner surface 200, 210, 220 Joint connector for multiplex communication

Claims (4)

An outer housing formed with a plurality of connector fitting portions for fitting with a plurality of mating connectors,
A terminal that is disposed in the outer housing so as to protrude into the connector fitting portion, and that contacts and electrically connects to a counterpart terminal of the counterpart connector when the counterpart connector is fitted to the connector fitting portion; ,
A ferrite plate disposed in the outer housing to be penetrated by the terminals;
An inner housing having a plate accommodating chamber in which one surface is opened and the ferrite plate is accommodated through the opening;
With
The outer housing is formed with an inner housing fitting portion for fitting the inner housing in which the ferrite plate is housed in the plate housing chamber,
The inner housing holds the terminals so that the inner housing protrudes into the connector fitting portion when the inner housing is fitted into the inner housing fitting portion, and the plate housing chamber is inserted. The impedance characteristic of the ferrite plate is adjusted to a desired numerical value by pressing the ferrite plate, the inner side of which defines the plate accommodating chamber being penetrated by the terminal, from the side surface.
A multiplex communication joint connector characterized by the above. The inner housing presses a part of the ferrite plate from which the inner surface defining the plate housing chamber is penetrated by the terminal,
The joint connector for multiplex communication according to claim 1. The ferrite plate is divided into a plurality corresponding to the connector fitting portion,
In the inner housing, the impedance characteristics of each of the ferrite plates are adjusted to a desired numerical value by pressing the ferrite plates each having an inner surface defining the plate housing chamber penetrated by the terminals. ing,
The joint connector for multiplex communication according to claim 2. The inner housing is provided with a plurality of spring members at positions facing the side surfaces of the ferrite plates on the inner side surface defining the plate housing chamber,
Each of the spring members presses the ferrite plate penetrated by the terminal from its side surface,
The joint connector for multiplex communication according to claim 3.

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