JP5244492B2 - Waveform distortion reducing member and communication line provided with the waveform distortion reduction member - Google Patents

Description

  The present invention relates to a waveform distortion reducing member and a communication line including the waveform distortion reducing member, and more specifically, to reduce transmission waveform distortion generated at a branch position of a communication network such as an in-vehicle LAN.

Conventionally, in a communication network such as an in-vehicle LAN, various techniques have been provided in order to reduce distortion of a transmission waveform that occurs at a branch position of a communication line.
For example, the present applicant has proposed a branching device 1 shown in FIG. 11 in Japanese Patent Application Laid-Open No. 2007-110195 (Patent Document 1). The branch device 1 accommodates a bus bar 2 for branch connection having a joint portion 2a and a plurality of terminal portions 2b protruding from the joint portion 2a in a housing, and a cylindrical magnetic member is provided at each terminal 2b of the bus bar 2. (Ferrite) 3 is attached. Each terminal 2b is connected to a terminal 5 of the terminal of the communication line 4, and a plurality of communication lines 4 are branched and connected. In this manner, the magnetic material 3 is attached to the terminal portion 2b of the bus bar 2 to reduce the distortion of the transmission waveform that occurs at the branch position.

  When branching the branch line 4b from the trunk line 4a of the communication line 4 using the branch device 1 as described above, the magnetic member 3a of the two ports of the magnetic member 3 is attached to the outer periphery of the trunk line 4a having a small impedance. The magnetic member 3b of the remaining port is attached to the outer periphery of the branch line 4b having a large impedance. On the other hand, the magnetic members 3a and 3b have the same magnetic characteristics in accordance with the impedance of the branch line so that the same waveform distortion relaxation effect can be obtained at each port. Therefore, when the number of branch lines increases and the number of branches from the main line to the branch line increases, there is a problem that the filter characteristic of the magnetic member 3a attached to the outer periphery of the main line 4a increases, and the drop in the reception voltage of the main line increases.

JP 2007-110195 A

  The present invention has been made in view of the above problems, and even if the number of branches from the trunk line to the branch line of the in-vehicle communication line increases, the waveform distortion at the branch position is effectively reduced, and the reception voltage of the trunk line is reduced. The problem is that the decrease can be suppressed.

In order to solve the above problems, as a first invention, a magnetic member made of one plate-like material is arranged on the outer periphery of a connection terminal connected to the main line and the branch line at a branch position where the branch line is branched from the main line of the in-vehicle communication line. The magnetic member includes a plurality of through holes, each having a main line through hole penetrating through the connection terminal connected to the main line and a branch line through hole penetrating through the connection terminal connected to each branch line. The hole has a larger diameter than the branch line through hole, and a gap between the inner peripheral surface of the trunk through hole and the outer peripheral surface of the connection terminal is defined as an inner peripheral surface of the branch line through hole and an outer peripheral surface of the connection terminal. Larger than the gap between
Wherein a magnetic member provides a waveform strain relief member, characterized in that it is smaller than the real component of the high frequency impedance of the real component into the branch of the high-frequency impedance entering the main line.

At the branch position where the branch line is branched from the trunk line of the in-vehicle communication line, the magnetic member is arranged on the outer circumference of the trunk line and the branch line as in the past, but according to the above configuration, the magnetic member is arranged on the outer circumference of the trunk line. And the filter characteristics of the magnetic member disposed on the outer periphery of the branch line are made different so that the real component of the high-frequency impedance entering the trunk line by the magnetic member is smaller than the real component of the high-frequency impedance entering the branch line. That is, the number of branches from the trunk line to the branch line can be reduced by making the filter characteristics of the magnetic member arranged on the outer circumference of the trunk line having a small real component of the high-frequency impedance smaller than the filter characteristics of the magnetic member arranged on the outer circumference of the branch line. Even if it increases, the drop in the reception voltage of the trunk line can be suppressed. Also, by increasing the real number component of the high-frequency impedance to the branch line by the magnetic member, that is, by increasing the filter characteristics, even if the number of branches to the branch line increases and the waveform distortion at the branch position increases, This distortion can be effectively reduced.
In the present invention, a trunk line refers to a communication line whose both ends are connected to a device via a termination resistor, and a branch line refers to a communication line branched from the trunk line and connected to the device without a termination resistor.

As described above, the magnetic member is made of a single plate-like material, and includes a plurality of through holes including a main line through hole penetrating the connection terminal connected to the main line and a branch line through hole penetrating the connection terminal connected to each branch line. With an interval,
The trunk line through hole has a larger hole diameter than the branch line through hole,
A gap between the inner peripheral surface of the main line through hole and the outer peripheral surface of the connection terminal connected to the main line penetrating the main line through hole was passed through the inner peripheral surface of the branch line through hole and the branch line through hole. than the gap between the outer peripheral surface of the connecting terminal connected to the branch line that has a large.

  As described above, by forming a magnetic member from one plate-like material having a main line through hole and a branch line through hole, the number of parts can be reduced compared to the conventional structure in which the magnetic member is separately attached to each main line and branch line. Size and assembly man-hours can be reduced.

  In addition, as described above, by making the hole diameter of the main line through hole larger than the hole diameter of the branch line through hole, the path of the magnetic flux lines generated on the outer periphery of the main line becomes larger, and consequently the magnetic flux generated on the outer periphery of the main line. Can be reduced from the magnetic flux generated on the outer periphery of the branch line, and the magnetic permeability can be lowered. Thereby, the real number component of the high frequency impedance entering the main line can be made smaller than the real number component of the high frequency impedance entering the branch line, and a decrease in the reception voltage of the main line can be suppressed.

  The value (R1 / R2) of the hole diameter R1 of the trunk line through hole to the hole diameter R2 of the branch line through hole differs depending on the branching state of the branch line, but cannot be limited. For example, R1 / R2 = 1. It is preferable to set it as 2-1.6.

Instead changing the hole diameter, the thickness of one plate-like member made of a magnetic member is partially changed, trunk through holes for passing mains respectively are provided in the plate thickness is small portion, of the trunk through hole length of the short and branch through hole to penetrate before Symbol each branch each is provided a plate thickness in the thick portion may be longer the length of the branch line through hole.
That is, as a second invention, a magnetic member made of one plate-like material is arranged on the outer periphery of the connection terminal connected to the main line and the branch line at the branch position where the branch line is branched from the main line of the in-vehicle communication line. Partially changing the plate thickness of the material, the trunk through-holes penetrating the trunk lines are provided in the thin plate portions to reduce the length of the trunk through-holes, while penetrating through the branch lines. The hole is provided in a thick plate portion, and the length of the branch line through hole is longer than the length of the trunk line through hole,
A waveform distortion reducing member is provided in which the real component of the high-frequency impedance entering the trunk line is made smaller than the real component of the high-frequency impedance entering the branch line by the magnetic member.

  As described above, by providing the trunk line through hole in a thin portion and shortening the length of the trunk line through hole, the magnetic flux generated on the outer periphery of the trunk line is reduced, and the magnetic permeability can be decreased. On the other hand, by providing the branch line through hole in the thick part and increasing the length of the branch line through hole, the magnetic flux generated on the outer periphery of the branch line is increased and the magnetic permeability can be increased. Thus, the real component of the high frequency impedance entering the main line can be made smaller than the real number component of the high frequency impedance entering the branch line, and a decrease in the reception voltage of the main line can be suppressed as described above.

  Although the value (D1 / D2) of the length (plate thickness) D1 of the trunk line through hole to the length (plate thickness) D2 of the branch line through hole varies depending on the branching state of the branch line, it cannot be limited. For example, it is preferable that D1 / D2 = 0.6 to 0.8.

The thickness of the hole diameter direction before Symbol mains through hole, may be thinner than the thickness of the diameter direction of the branch line through hole. It said stem line through hole, and the thickness of the hole diameter direction of the branch line through hole, refers to the distance to the magnetic member outer surface adjacent the inner peripheral surface of the through hole.
That is, as a third invention, a magnetic member made of one plate-like material is arranged on the outer periphery of the connection terminal connected to the trunk line and the branch line at a branch position where the branch line is branched from the trunk line of the in-vehicle communication line, and the trunk line penetrates. The thickness in the hole diameter direction from the inner peripheral surface of the hole to the adjacent outer surface of the magnetic member is smaller than the thickness in the hole diameter direction of the branch line through hole,
A waveform distortion reducing member is provided in which the real component of the high-frequency impedance entering the trunk line is made smaller than the real component of the high-frequency impedance entering the branch line by the magnetic member.
Further, a single plate-like material made of a magnetic member is provided with a high magnetic permeability portion and a low magnetic permeability portion, and the branch passage through holes are provided in the high magnetic permeability portion, while the low magnetic permeability portion is provided. The trunk line through hole may be provided in the main line.
That is, as a fourth invention, at the branch position where the branch line is branched from the trunk line of the in-vehicle communication line, a magnetic member made of one plate material is disposed on the outer periphery of the connection terminal connected to the trunk line and the branch line, and the magnetic member Has a highly permeable part and a low permeable part divided into regions,
While providing each branch line through hole in the high magnetic permeability portion, providing the trunk through hole in the low magnetic permeability portion,
A waveform distortion reducing member is provided in which the real component of the high-frequency impedance entering the trunk line is made smaller than the real component of the high-frequency impedance entering the branch line by the magnetic member.

As in the third aspect of the present invention , the magnetic flux generated in the outer circumference of the trunk line is reduced by making the thickness in the radial direction of the trunk line through-hole thinner than the thickness in the radial direction of the branch line through-hole. The magnetic permeability can be made smaller than the magnetic permeability around the branch line.
Further, as in the fourth aspect of the present invention , a high magnetic permeability portion and a low magnetic permeability portion are provided separately in a single magnetic member, each branch through hole is provided in the high magnetic permeability portion, and the main line is penetrated in the low magnetic permeability portion. By providing each hole, the waveform distortion at the branch position can be effectively alleviated and the drop in the main line reception voltage can be suppressed, and the number of parts, size, and assembly man-hours can be reduced by the integrated magnetic member. Is also possible.

The magnetic member is preferably made of ferrite. In particular, the ferrite is preferably formed of a material containing a Ni—Zn component as a component.
The magnetic material may be formed of Mn—Zn ferrite, silicon steel plate, permalloy, or amorphous metal magnetic material having a low material resistance.

  On the other hand, the magnetic member is not integrated, but is formed of two separate high-permeability members and low-permeability members as magnetic members, and a branch-line through portion that penetrates each branch line is provided in the high-permeability member. On the other hand, it is good also as a structure which provided the trunk line through-hole which penetrates a trunk line in the said low magnetic permeability member.

  That is, a high-permeability member and a low-permeability member are formed from two different types of magnetic materials, each branch line through hole is provided in the high-permeability member, and the main-line through hole is provided in the low-permeability member. By arranging them in parallel, it is possible to obtain a magnetic member having the same effect as the integrated magnetic member having the high magnetic portion and the low magnetic permeability portion. At this time, the hole diameter of the branch line through hole and the trunk through hole, the length (plate thickness) of the through hole, and the thickness in the hole diameter direction may be the same, but when the difference in magnetic properties is to be further increased, You may make it differ.

  The material forming the high magnetic permeability member preferably has a property 1.2 to 1.6 times that of the low magnetic permeability member.

Furthermore, as a fifth invention, there is provided a communication line provided with the waveform distortion reducing member according to any one of the first to fourth inventions . In the communication line, the trunk line is connected to a device at both ends via a termination resistor, and the branch line is connected to the device without a termination resistor,
While providing a trunk line through hole at both ends of the magnetic member of the waveform distortion reducing member and penetrating the trunk line, a plurality of branch line through holes are provided at the center, and the branch lines are respectively penetrated through these branch line through holes, or The trunk line through hole is provided in parallel at one end side of the region where the branch line through hole is arranged in parallel, and the branch line and the trunk line are respectively penetrated.

According to the above configuration, the waveform distortion mitigation member (magnetic member) can effectively mitigate waveform distortion at the branch position while suppressing a decrease in the reception voltage of the trunk line, and further, both ends of the trunk line can be connected via the terminating resistor. Since reflection of signals transmitted and received is suppressed by connecting to a device, communication between devices can be performed extremely well.
As described above, the magnetic member may be an integral type or a separate type. For example, when the magnetic member is formed of a magnetically permeable member and a low magnetically permeable member as separate members, the branch through holes are arranged in parallel. A low-permeability member in which a low-permeability member provided with a trunk through hole is disposed at both ends of the high-permeability member, or a main through-hole is juxtaposed at one end of a high-permeability member in which a branch through-hole is juxtaposed. Is preferably arranged.

  When the in-vehicle communication line has a communication protocol of CAN, the trunk line and the branch line are twisted pair electric wires, and the main line through hole and the branch line through hole provided in the magnetic member of the waveform distortion reducing member are connected to the twisted pair electric wire or the twisted pair electric wire. Each pair of through-holes penetrates the connection terminal.

Furthermore, this invention provides the branch connector provided with the above-mentioned waveform distortion relaxation member.

The branch connector accommodates a bus bar in a connector housing, and fits and connects a plurality of tab-like terminal portions protruding from the joint portion of the bus bar and terminals of the terminal side connector connected to the wire terminals of the main line and the branch line. Thus, the branch line can be branched from the main line.
At that time, the tab-shaped terminal portion connected to the main wire through the terminal of the terminal-side connector is connected to the trunk through hole, and the tab-shaped terminal portion connected to the branch wire is connected to the terminal-side connector of the terminal. It is preferable that the waveform distortion reducing member made of the magnetic member is housed and fixed in the connector housing of the branch connector so as to penetrate through the branch line through holes.
Examples of a method for fixing the magnetic member in the connector housing include molding and locking.

  According to the above configuration, since the waveform distortion reducing member is provided in the branch connector, when branching the branch line from the main line, the waveform distortion at the branch position is effectively prevented without causing a significant decrease in the reception voltage of the main line. Can be relaxed.

  As described above, according to the present invention, the magnetic characteristic of the magnetic member disposed on the outer periphery of the main line is different from the magnetic characteristic of the magnetic member disposed on the outer periphery of the branch line, and the real number of high-frequency impedances entering the main line by the magnetic member. Since the component is made smaller than the real component of the high frequency impedance entering the branch line to weaken the filter characteristics, it is possible to suppress a decrease in the reception voltage of the main line even if the number of branches from the main line to the branch line increases. In addition, since the real component of the high-frequency impedance to the branch line by the magnetic member is larger than the main line side, even if the number of branches to the branch line increases and the waveform distortion at the branch position increases, the distortion is effective. It becomes possible to relax.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4 show a first embodiment of the present invention.
The magnetic member 10 which is a waveform distortion reducing member of the present embodiment is for reducing transmission waveform distortion generated at a branch position where the branch line 21 branches from the trunk line 20 of the communication line forming the CAN communication circuit of the in-vehicle LAN.
In the present embodiment, as shown in FIG. 1, the magnetic member 10 is used by being fitted inside a branch connector 30 that branches four branch lines 21 from the main line 20.

In this embodiment, the communication line is comprised from the twisted pair electric wires 20 and 21 which form the balanced communication line of differential transmission. The twisted pair electric wires 20 and 21 are formed by twisting the communication lines 20H and 21H constituting the CAN-H circuit and the communication lines 20L and 21L constituting the CAN-L circuit. In this embodiment, the twisted pair electric wires 20 and 21 are shown in FIG. One set of twisted pair electric wires 20 on each side is used as a main line, and four sets of twisted pair electric wires 21 on the center side are used as branch lines branched from the main line 20.
The female terminal 22 is connected to the terminal of the trunk twisted pair electric wire 20 (20H, 20L), the female terminal 22 is inserted and locked into the female connector 24, and the female terminal 23 is connected to the terminal of the branch twisted electric wire 21 (21H, 21L). And the female terminal 23 is inserted and locked to the female connector 25. Thereby, the female connectors 24 and 25 are connected to the ends of the twisted pair electric wires 20 and 21 of the trunk line and the branch line, respectively.

  The branch connector 30 shown in FIGS. 1 to 3 allows the female connectors 24 and 25 to be individually inserted into the connector fitting portion 32 of the connector housing 31. The connector fitting portion 32 has a bus bar 33 for branch connection up and down. Two stages are accommodated. The bus bar 33 is formed by punching a conductive metal plate into a required shape, and includes a strip-shaped joint portion 33a and a plurality of tab-shaped terminal portions 33b and 33c protruding from the end edge of the joint portion 33a. . In the present embodiment, a total of six terminal portions 33b and 33c protrude from the joint portions 33a of the upper and lower bus bars 33, and the terminal portions 33b on both sides are connected to the trunk line 20 (20H, 20H, 20) via the female terminals 22 of the inserted female connector 24. 20L), the central four terminal portions 33c are connected to the branch line 21 (21H, 21L) via the female terminal 23 of the inserted female connector 25.

The magnetic member 10 is made of ferrite formed of a material containing Ni—Zn as a component, and is a plate-like material having a rectangular parallelepiped shape that can be fitted into the connector fitting portion 32 of the branch connector 30.
The magnetic member 10 is provided with a trunk through hole 11 and a branch through hole 12. In the present embodiment, as shown in FIGS. Four sets of upper and lower branch line through holes 12 are arranged in parallel at the center.
In a state where the magnetic member 10 is fitted in the connector fitting portion 32, the terminal portion 33b connected to the trunk line 20 (20H, 20L) is penetrated through the trunk line through holes 11 at both ends, and the branch line 21 (21H, 21L) is connected. The tab-like terminal portions 33c to be connected are respectively penetrated into the branch line through holes 12 on the center side.

  Further, the hole diameter R1 of the trunk through hole 11 is made larger than the hole diameter R2 of the branch through hole 12, and the real component of the high frequency impedance entering the trunk line 20 is made smaller than the real component of the high frequency impedance entering the branch line 21. In the present embodiment, the value of R1 / R2 is 1.6.

  The magnetic member 10 is inserted into the connector fitting part 32 of the branch connector 30, and the trunk line through hole 11 and the branch line through hole 12 are rooted in the terminal parts 33 b and 33 c of the bus bar 33 accommodated in the connector fitting part 32. The magnetic member 10 is locked and fixed in the connector fitting portion 32 in a state of being penetrated to the portion. A locking claw 32a for locking and fixing the magnetic member 10 is provided on the inner surface of the peripheral wall of the connector fitting portion 32 [FIG. 2 (B)].

By fitting and connecting the female connectors 24 and 25 to the branch connector 30, the terminal portion 33 b penetrating the main line through hole 11 of the magnetic member 10 is connected to the main line 20 (20 H, 20 L), while the branch line through hole 12 is connected. The penetrating terminal portion 33c is connected to the branch line 21 (21H, 21L). Thereby, the four branch lines 21 can be branched from the trunk line 20 (FIG. 3).
Note that both ends of the trunk line 20 are connected to a device (not shown) via a termination resistor, while the branch line 21 is connected to a device (not shown) without a termination resistor.

As described above, by making the hole diameter R1 of the main line through hole 11 larger than the hole diameter R2 of the branch line through hole 12, the magnetic flux generated on the outer periphery of the main line 20 is reduced from the magnetic flux generated on the outer periphery of the branch line 21, Magnetic permeability can be lowered. Therefore, the real component of the high-frequency impedance entering the trunk line 20 is made smaller than the real component of the high-frequency impedance entering the branch line 21, and the filter characteristics of the magnetic member 10 disposed on the outer periphery of the trunk line 20 are set to the magnetic member 10 disposed on the outer periphery of the branch line 21. The filter characteristics can be made smaller.
Therefore, even if the number of branches from the main line 20 to the branch line 21 increases, a decrease in the reception voltage of the main line 20 can be suppressed. Further, by increasing the real number component of the high-frequency impedance to the branch line 21 by the magnetic member 10 and increasing the filter characteristics, even if the number of branches to the branch line 21 increases and the waveform distortion at the branch position increases, This distortion can be effectively reduced.

  Further, as described above, by forming the magnetic member 10 from one plate-like material having the main line through hole 11 and the branch line through hole 12, the magnetic member is separately attached to each main line 20 and branch line 21. Compared to the structure, the number of parts, size, and assembly man-hour can be reduced.

FIG. 5 shows a second embodiment.
In the second embodiment, as shown in FIG. 5, the diameters of the trunk line through hole 11 and the branch line through hole 12 of the magnetic member 10 are the same, while the thickness D1 of the portion where the trunk line through hole 11 is provided is the branch line penetration. The first embodiment is the same as the first embodiment except that the length D1 of the main line through hole 11 is made shorter than the plate thickness D2 of the portion where the hole 12 is provided, and the length D2 of the branch line through hole 12 is shortened. In the present embodiment, the value of D1 / D2 is set to 0.6.

  Also in the second embodiment, the magnetic flux generated on the outer periphery of the main line 20 can be made smaller than the magnetic flux generated on the outer periphery of the branch line 21, and the magnetic permeability of the outer periphery of the main line 20 can be made smaller than the magnetic permeability of the outer periphery of the branch line 21. Therefore, the real number component of the high frequency impedance entering the main line 20 can be made smaller than the real number component of the high frequency impedance entering the branch line 21, and a decrease in the reception voltage of the main line 20 can be suppressed.

  When it is desired to further reduce the filter characteristics of the magnetic member 10 on the outer periphery of the main line 20, the hole diameter of the main line through hole 11 of the magnetic member 10 of the second embodiment is larger than the hole diameter of the branch line through hole 12 as shown in FIG. 6. This is also possible.

FIG. 7 shows a third embodiment.
In the third embodiment, as shown in FIG. 7, the hole diameters of the trunk line through hole 11 and the branch line through hole 12 of the magnetic member 10 are the same, while the thickness d1 of the trunk line through hole 11 in the hole diameter direction is made to penetrate the branch line. The second embodiment is the same as the first embodiment except that the thickness is smaller than the thickness d2 of the hole 12 in the hole diameter direction. In the present embodiment, d1 / d2 is set to 1.6.

  Also in the third embodiment, as in the first and second embodiments, the magnetic flux generated on the outer periphery of the trunk line 20 is made smaller than the magnetic flux generated on the outer periphery of the branch line 21, and the permeability of the outer periphery of the trunk line 20 is made transparent. It can be made smaller than the magnetic susceptibility. Therefore, the real number component of the high frequency impedance entering the main line 20 can be made smaller than the real number component of the high frequency impedance entering the branch line 21, and a decrease in the reception voltage of the main line 20 can be suppressed.

FIG. 8 shows a fourth embodiment.
As shown in FIG. 8, in the fourth embodiment, the magnetic member 10 is composed of two kinds of materials, a low magnetic permeability member 10A and a high magnetic permeability member 10B, and a pair of upper and lower trunk penetrations is formed in the low magnetic permeability member 10A. While the holes 11 are provided, four sets of upper and lower branch through holes 12 are provided in parallel in the highly permeable member 10B. One low-permeability member 10A is arranged on each side of the high-permeability member 10B to form a rectangular parallelepiped magnetic member 10 as a whole as in the first embodiment.
In the present embodiment, the material forming the high magnetic permeability member is formed from a material having 1.2 times the characteristics of the low magnetic permeability member. Except for the points described above, the second embodiment is the same as the first embodiment.

  As described above, even when the portion of the magnetic member 10 provided with the main through hole 11 is formed from the low magnetic permeability member 10A and the portion of the branch line through hole 12 is formed from the high magnetic permeability member 10B, the first to the third. Similarly to the embodiment, the real number component of the high frequency impedance entering the trunk line 20 can be made smaller than the real number component of the high frequency impedance entering the branch line 21 to suppress a decrease in the reception voltage of the trunk line 20.

9 and 10 show a fifth embodiment.
In the fifth embodiment, two sets of twisted pair electric wires 20 on the left side shown in FIG. 9 are used as trunk lines, and four sets of right twisted pair electric wires 21 are used as branch lines branched from the main line 20.
Similarly to the fourth embodiment, the magnetic member 10 is composed of two kinds of materials, a low magnetic permeability member 10A and a high magnetic permeability member 10B, and two sets of upper and lower trunk through holes 11 are arranged in parallel in the low magnetic permeability member 10A. On the other hand, four sets of upper and lower branch line through holes 12 are provided in parallel in the high magnetic permeability member 10B. The low magnetic permeability member 10A is arranged on one end side of the high magnetic permeability member 10B in accordance with the arrangement of the trunk line 20 and the branch line 21, thereby forming the magnetic member 10 having a rectangular parallelepiped shape as a whole (FIG. 10). Except for the points described above, the second embodiment is the same as the first embodiment.

  As described above, even when the low magnetic permeability member 10A is arranged on one end side of the high magnetic permeability member 10B in accordance with the arrangement of the main line 20 and the branch line 21, the high frequency entering the main line 20 is the same as in the fourth embodiment. The real component of the impedance can be made smaller than the real component of the high-frequency impedance that enters the branch line 21, and a decrease in the reception voltage of the trunk line 20 can be suppressed.

  In the embodiment, the magnetic member 10 is fitted in the connector fitting portion 32 of the branch connector 30, and the terminal portions 33 b and 33 c of the bus bar 33 accommodated in the branch connector 30 are passed through the trunk through hole 11 and the branch through hole 12. However, if it is in the vicinity of the branch position, the main line through hole 11 and the branch line through hole 12 of the magnetic member 10 directly pass through the twisted pair electric wire 20 (20H, 20L) of the main line and the twisted pair electric wire 21 (21H, 21L) of the branch line. It is also possible to make it.

It is a schematic explanatory drawing of 1st Embodiment which has applied the waveform distortion relaxation member (magnetic member) of this invention to the branch connector. (A) is a horizontal sectional view of the branch connector, (B) is a vertical sectional view of the branch connector. The state which connected the connector of the electric wire terminal to the branch connector is shown, (A) is a horizontal sectional view, (B) is a vertical sectional view. It is a schematic perspective view of a magnetic member. It is a schematic perspective view which shows the magnetic member of 2nd Embodiment. It is a schematic perspective view which shows another example of a magnetic member. It is a schematic perspective view which shows the magnetic member of 3rd Embodiment. It is a schematic perspective view which shows the magnetic member of 4th Embodiment. It is a schematic explanatory drawing which shows the example which applies the magnetic member of 5th Embodiment to a branch connector. It is a schematic perspective view which shows the magnetic member of 5th Embodiment. It is drawing which shows a prior art example.

Explanation of symbols

10 Waveform distortion reducing member (magnetic member)
10A Low magnetic permeability member 10B High magnetic permeability member 11 Trunk through hole 12 Branch through hole 20 Twisted pair electric wire 21 serving as trunk line Twisted pair electric wire 22 serving as trunk line, female terminals 24, 25 Female connector 30 Branch connector 31 Connector housing 32 Connector fitting Part 33 Bus bar 33a Joint part 33b, 33c Terminal part

Claims (7)

At the branch position where the branch line is branched from the trunk line of the in-vehicle communication line, a magnetic member made of one plate-like material is disposed on the outer periphery of the connection terminal connected to the trunk line and the branch line, and the magnetic member is a connection terminal connected to the trunk line A plurality of through holes each having a branch through hole penetrating a connecting terminal connected to each branch line and a main line through hole penetrating the branch line, the main line through hole having a larger hole diameter than the branch line through hole, The clearance between the inner peripheral surface of the main line through hole and the outer peripheral surface of the connection terminal that has penetrated the main line through hole is the gap between the inner peripheral surface of the branch line through hole and the connection terminal that has penetrated the branch line through hole. Larger than the gap between the outer peripheral surface,
The magnetic member by the waveform strain relief member, characterized in that it is smaller than the real component of the high frequency impedance of the real component into the branch of the high-frequency impedance entering the main line. At the branch position where the branch line is branched from the trunk line of the in-vehicle communication line, a magnetic member made of one plate material is disposed on the outer periphery of the connection terminal connected to the trunk line and the branch line, and the plate thickness of the plate material is partially Change the trunk line through hole that penetrates the connection terminal connected to the trunk line in the portion where the plate thickness is thin to shorten the length of the trunk line through hole, while penetrating the connection line that penetrates the connection terminal connected to each branch line The hole is provided in a thick plate portion, and the length of the branch line through hole is longer than the length of the trunk line through hole,
A waveform distortion reducing member characterized in that a real component of a high-frequency impedance entering the trunk line is made smaller than a real component of a high-frequency impedance entering a branch line by the magnetic member. At the branch position where the branch line is branched from the trunk line of the in-vehicle communication line, a magnetic member made of one plate-like material is arranged on the outer periphery of the connection terminal connected to the trunk line and the branch line, and is adjacent to the inner peripheral surface of the trunk through hole. The thickness in the hole radial direction to the outer surface of the magnetic member is thinner than the thickness in the hole radial direction of the branch line through hole,
A waveform distortion reducing member characterized in that a real component of a high-frequency impedance entering the trunk line is made smaller than a real component of a high-frequency impedance entering a branch line by the magnetic member. At the branch position where the branch line is branched from the trunk line of the in-vehicle communication line, a magnetic member made of one plate-like material is arranged on the outer periphery of the connection terminal connected to the trunk line and the branch line,
The magnetic member comprises a highly permeable portion and a low permeable portion divided into regions,
While providing a branch through hole in the high magnetic permeability portion, providing a trunk through hole in the low magnetic permeability portion,
A waveform distortion reducing member characterized in that a real component of a high-frequency impedance entering the trunk line is made smaller than a real component of a high-frequency impedance entering a branch line by the magnetic member. A communication line comprising the waveform distortion reducing member according to any one of claims 1 to 4,
The trunk line is connected to the device at both ends via a termination resistor, the branch line is connected to the device without a termination resistor,
A main line through hole is provided at both ends of the magnetic member of the wave distortion reducing member to allow the connection terminal connected to the main line to pass therethrough, while a plurality of branch line through holes are provided at the center, and each of the branch line through holes is respectively connected to the branch line. Pierce the connected connection terminal,
Or the communication line provided with the waveform distortion alleviation member which provided the trunk line through hole in parallel in the one end side of the field where the branch line through hole was arranged in parallel, and penetrated the connection terminal connected to the branch line and the trunk line, respectively . The in-vehicle communication line has a communication protocol CAN, and the trunk line and the branch line are twisted pair electric wires.
The trunk line through hole and branch line through hole provided in the magnetic member of the wave distortion reducing member are each a pair of through holes that allow the twisted pair electric wires or connection terminals connected to the twisted pair electric wires to pass therethrough. A communication line provided with a waveform distortion reducing member. The branch connector provided with the waveform distortion relaxation member of any one of Claims 1 thru | or 4.

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