JP2009009729A - Connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connector having a structure that allows a characteristic impedance in the lead-out part of a center contact led out from a coaxial socket, to be easily controlled. <P>SOLUTION: The connector includes: a housing 11 having a part (a coaxial socket part 30) fitted with a coaxial plug; a center contact 31 mounted to the housing 11 so as to be connected to a signal pattern of a circuit board; a GND contact 32 mounted on the housing 11 so as to be connected to a GND pattern of the circuit board; and a dummy metal-fitting 14 mounted on the housing 11 so as to be connected to the GND pattern of the circuit board. The center contact 31 has a center lead-out part 31E led out from the housing 11 toward the signal pattern of the circuit board. The dummy metal-fitting 14 has an extension part 14Z extended so as to face the center lead-out part 31E while being spaced at an interval. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a connector having a portion (coaxial socket) with which a coaxial plug is engaged, and more particularly to a connector that can easily control its characteristic impedance.

  In a high-frequency signal transmission circuit, it is necessary to control the characteristic impedance of the transmission circuit in order to suppress noise caused by a reflected wave of the signal.

  Therefore, the coaxial cable with the adjusted characteristic impedance is connected to the coaxial socket with the same impedance adjusted through the coaxial plug with the same impedance adjusted, and the coaxial socket is connected to the circuit board with the same impedance adjusted. The method is widely adopted. As described above, the characteristic impedance of each of the coaxial cable, the coaxial plug, the coaxial socket, and the circuit board is accurately controlled, but conventionally, the coaxial cable is drawn from the coaxial socket and soldered to the conductor pattern of the circuit board. The drawer portion was not carefully considered for controlling the characteristic impedance.

  For example, the connector described in Patent Document 1 includes a coaxial socket, and the lead-out portion of the center contact drawn out from the coaxial socket is suspended in the direction of the circuit board through the notch portion of the housing of the coaxial socket. The leg at the tip is soldered to the conductor pattern of the circuit board. The periphery of this drawer is exposed to the air layer, and the walls of the synthetic resin that forms the housing are close to the left and right, the ceiling, and the back side. In addition, other contacts (contact stand legs) are connected to the drawer. Therefore, the characteristic impedance of the lead-out portion tends to be higher than that of the coaxial plug, the coaxial socket, and the circuit board.

  In other words, it can be said that conventionally, the lead portion of the center contact drawn from the coaxial socket has been drawn out of the housing and connected to the circuit board.

JP 11-224737 A

  The object of the present invention created in view of the above circumstances is a structure that can be easily controlled in order to match the characteristic impedance in the lead-out portion of the center contact drawn from the coaxial socket with other parts. It is to provide a connector.

  In order to achieve the above object, the present invention provides a housing having a portion into which a coaxial plug is fitted, a housing mounted on the housing, capable of contacting a signal terminal of the coaxial plug, and connected to a signal pattern on a circuit board. A center contact that is attached to the housing and is capable of contacting the GND terminal of the coaxial plug, is connected to a GND pattern of the circuit board, and is attached to the housing and is connected to the GND of the circuit board. A connector having a dummy fitting connected to a pattern, wherein the center contact has a center lead portion led out from the housing toward the signal pattern of the circuit board, and the dummy fitting is It has an extending part which is opposed to the center lead part with a gap.

  The GND contact may have a GND lead portion drawn out from the housing toward the GND pattern of the circuit board, and the GND lead portion and the center lead portion may be arranged close to each other.

  The center lead portion, the GND lead portion, and the extending portion may be arranged in parallel.

  The extending part of the dummy metal fitting may be embedded in the housing.

  The housing has a portion in which a multi-pin plug is fitted in addition to a portion in which the coaxial plug is fitted, and the dummy fitting is a reinforcing member for mounting the board for fixing the housing to the circuit board It may also serve as.

  According to the structure of the connector according to the present invention, it is possible to easily control the characteristic impedance in the lead portion of the center contact drawn from the coaxial socket.

  A preferred embodiment of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a perspective view of a composite socket as a connector according to the present embodiment as viewed obliquely from the upper front, and FIG. 2 is a perspective view of the composite socket as viewed from obliquely upward and rearward.

  As shown in FIG. 1, the composite socket 10 is configured by integrally combining a multi-pin socket portion 20 and a coaxial socket portion 30, and a multi-pin plug portion and a coaxial socket portion 30 corresponding to the multi-pin socket portion 20. The composite plug (not shown) provided with the coaxial plug part corresponding to is disengaged.

  In other words, the composite socket 10 includes a synthetic resin housing 11 having an outer appearance formed in a substantially rectangular parallelepiped shape. A multi-pin plug portion of a composite plug (not shown) can be fitted on the front surface a of the housing 11. A socket portion 20 and a coaxial socket portion 30 into which the coaxial plug portion of the composite plug can be fitted are provided. The coaxial socket part 30 is disposed on both sides of the multi-pin socket part 20.

  The multi-pin socket portion 20 includes a rectangular opening 12 that is recessed in the front surface a of the housing 11 and a flat projection 17 that is protruded inside the rectangular opening 12. A plurality of contact terminals 21 that can come into contact with the terminals of the multi-pin plug portion of the composite plug that is inserted into the composite socket 10 are arranged in parallel on the upper and lower surfaces of the protrusion 17.

  The coaxial socket portion 30 has a cylindrical portion 18 having a circular opening 13 formed at the center. Inside the circular opening 13 is accommodated a center contact 31 that can come into contact with the signal terminal of the coaxial plug portion of the composite plug that fits into the composite socket 10. A cylindrical GND contact 32 that can come into contact with the GND terminal of the plug portion is fitted.

  As shown in FIG. 2, the contact terminal 21 of the multi-pin socket portion 20 has a contact terminal lead portion 21E that protrudes from the rear surface b of the housing 11 and is bent toward a circuit board (not shown), and the lead portion 21E. A tail portion 21T to be soldered to the conductor pattern of the circuit board is formed at the tip of the circuit board.

  Similarly, the center contact 31 of the coaxial socket portion 30 has a center lead portion 31E that protrudes from the rear surface b of the housing 11 and is bent toward the circuit board. At the tip of the center lead portion 31E, there is a circuit board. A tail portion 31T to be soldered to the conductor pattern (signal pattern) is formed.

  The GND contact 32 of the coaxial socket portion 30 has a GND lead portion 32E that protrudes from the rear surface b of the housing 11 and is bent toward the circuit board, and at the tip of the GND lead portion 32E, A tail portion 32T to be soldered to the conductor pattern (GND pattern) is formed.

  That is, in the composite socket 10, the tail portion 21T of the contact terminal lead portion 21E, the tail portion 31T of the center lead portion 31E, and the tail portion 32T of the GND lead portion 32E that protrude from the rear surface b of the housing 11 are not shown. It is mounted on a circuit board by being soldered to each of the conductor patterns formed.

  Further, the composite socket 10 has a dummy metal fitting 14 (reinforcement terminal, dummy pin) attached to the housing 11 in order to increase the mounting strength on the circuit board. The dummy metal fitting 14 has a tail portion 14T that is press-fitted from below into a mounting groove 14F formed on the lower surface c of the housing 11 and soldered to a conductor pattern (GND pattern) formed on the circuit board.

  FIG. 3 which is a cross-sectional view taken along line III-III in FIG. 2 shows a detailed structure of the coaxial socket portion 30 described above. Strictly speaking, in FIG. 3, the fracture surface of the press-fit portion 32 </ b> A of the GND contact 32 is on the right side (front side) in the drawing than the fracture surface of the contact portion 32 </ b> S and the fracture surface of the housing 11. It protrudes somewhat.

  As shown in FIG. 3, the front surface a of the housing 11 is provided with a cylindrical portion 18 having a circular opening 13 into which a signal terminal of a coaxial plug portion of a composite plug (not shown) can be fitted. A GND contact hole 16 into which the GND terminal of the coaxial plug portion of the composite plug can be fitted is formed. In the housing 11, a center contact hole 15 that communicates with the circular opening 13 and a center contact press-fit groove 15 </ b> F connected to the circular opening 13 are formed to penetrate to the rear surface b of the housing 11, and a GND contact press-fit that communicates with the GND contact hole 16. A groove 16 </ b> F is formed to penetrate to the rear surface b of the housing 11.

  A center contact 31 is inserted from the rear surface b of the housing 11 into the center contact hole 15 and the center contact press-fitting groove 15F. The inserted center contact 31 has a portion protruding from the center contact press-fitting groove 15F to the rear surface b of the housing 11 bent at a substantially right angle toward a circuit board (not shown) to become a lead portion 31E, and its tip is substantially perpendicular to the reverse direction. To the tail portion 31T.

  A GND contact 32 is inserted into the GND contact hole 16 and the GND contact press-fitting groove 16F from the front surface a of the housing 11. In the inserted GND contact 32, a portion protruding from the GND contact press-fitting groove 16F to the rear surface b of the housing 11 is bent at a substantially right angle toward the circuit board to become a lead-out portion 32E, and the tip thereof is at a substantially right angle in the reverse direction. The tail portion 32T is bent.

  A center contact portion 31 </ b> S of the center contact 31 is disposed in the center contact hole 15. The center contact portion 31S is bent so as to be slightly inclined with respect to the insertion direction of the coaxial plug portion of the composite plug (not shown), and contacts the signal terminal (needle shape) of the coaxial plug portion.

  In the GND contact hole 16, a GND contact portion 32S of the GND contact 32 is disposed. The GND contact portion 32S is formed in a substantially cylindrical shape so as to surround the column portion 18 in which the circular opening 13 is formed, and is in contact with the GND terminal (cylindrical shape) of the coaxial plug portion.

  A dummy fitting 14 is mounted on the rear surface b side of the lower surface c of the housing 11. The dummy metal fitting 14 has a press-fit portion 14A that is press-fitted into a mounting groove 14F formed on the lower surface c of the housing 11, and a tail portion 14T that is soldered to a GND pattern of a circuit board (not shown). The press-fit portion 14A is formed with an extended portion 14Z extending to a position facing the back surface of the lead portion 31E of the center contact 31. That is, the dummy metal fitting 14 is not in contact with the center contact 31 and the GND contact 32, and the extended portion 14 </ b> Z is opposed to the lead-out portion 31 </ b> E of the center contact 31 with an interval.

  FIG. 4 is a perspective view showing details of the center contact 31, the GND contact 32, and the dummy fitting 14 of the coaxial socket portion 30.

  As shown in FIG. 4, the GND contact 32 includes a cylindrical portion 32 </ b> C whose outer periphery is a contact portion 32 </ b> S, and a bowl-shaped press-fit portion 32 </ b> A that is fitted in a press-fit groove 16 </ b> F formed in the housing 11. In addition, it has a GND lead part 32E drawn from the rear surface b of the housing 11 and directed to the circuit board, and a tail part 32T connected to the GND lead part 32T.

  The center contact 31 is formed in the housing 11 while being spaced apart from the cylindrical portion 32C and extending through the contact portion 31S in the direction of the circular opening 13 and spaced from the flange-shaped press-fit portion 32A. A flat press-fit portion 31A fitted in the press-fit groove 15F, a center lead portion 31E drawn from the rear surface b of the housing 11 and directed to the circuit board, and a tail portion 31T connected thereto. Have.

  The center lead portion 31E and the GND lead portion 32E are suspended in parallel toward the circuit board at the same distance from the rear surface b of the housing 11. The extending portion 14Z of the dummy metal fitting 14 extends to the back side of the lead portion 31E of the center contact 31 in the housing 11 as described above. The center lead portion 31E, the GND lead portion 32E, and the extending portion 14Z are arranged in parallel.

  The operation of this embodiment will be described.

In general, the characteristic impedance Z is
Z = √ (L / C)
L: Inductance
C: can be expressed as capacitance.

  In other words, the characteristic impedance Z of the lead portion 31E of the center contact 31 through which the high-frequency signal is transmitted is determined by the inductance L and the capacitance C, but the inductance L is exclusively the length of the lead portion 31E (after designing once, it is basically Therefore, the same impedance is controlled by changing the capacitance C.

This capacitance C is
C = ε (S / d)
ε: dielectric constant
S: Area
d: There is a relationship with distance.

  The capacitance C is determined by the distance d1 between the lead portion 31E of the central contact 31 and the lead portion 32E of the GND contact 32 parallel to the lead portion 31E, and the extension portion 14Z of the dummy metal fitting 14 extending on the back surface of the lead portion 31E. A function using the distance d2 between them as a parameter (if the distances d1 and d2 are increased, the capacitance C is reduced and the impedance Z is increased), and the area S1 of the facing surface between the lead portion 31E and the lead portion 32E A function with the area S2 between the back surface of the lead portion 31E and the opposing surface of the extending portion 14Z facing this as a parameter (if the areas S1 and S2 increase, the capacitance C increases and the impedance Z decreases) And dominated by.

  Note that the distance d1 is a distance between the side end surface of the drawer portion 31E and the side end surface of the drawer portion 32E facing in parallel thereto, and the distance d2 is an extension facing the back surface of the drawer portion 31E in parallel with this. It is the distance between the front of the installation part 14Z. The area S1 is an area in the portion of the distance d1 between the side end surface of the drawer portion 31E and the side end surface of the drawer portion 32E facing in parallel thereto, and the area S2 is opposite to the back surface of the drawer portion 31E in parallel with this. It is an area in the part of the said distance d2 with the front of the extending part 14Z.

  Incidentally, since the periphery of the lead portion 31E of the center contact 31 is exposed to the air layer, the dielectric constant ε of air is assumed as a dielectric.

  As is clear from these, according to the present embodiment in which the extended portion 14Z of the dummy metal fitting 14 is extended to the back surface of the lead portion 31E of the center contact 31, the extended length of the extended portion 14Z (see FIG. 4). The capacitance C can be changed and the characteristic impedance Z can be controlled by adjusting the area S2 by appropriately changing at least one of the extension length in the horizontal direction and the extension length in the vertical direction). it can.

  In particular, as the fate of the connector, the inductance L, the distance d (d1, d2), and the dielectric constant ε have almost no design freedom, and therefore the characteristic impedance Z is very difficult to control. However, in the present embodiment, since the extended portion 14Z of the dummy metal fitting 14 is extended so as to face the back surface of the lead portion 31E of the center contact 31, the extension length of the extended portion 14Z can be adjusted. The area S2 can be adjusted to easily control the impedance.

  In the above embodiment, the present invention is applied to the coaxial socket portion 30 of the composite socket 10 including the multi-pin socket portion 20 and the coaxial socket portion 30 as described with reference to FIGS. 1 and 2. In general, the composite socket 10 is provided with a dummy fitting 14 in order to secure the mounting strength to the circuit board.

  In the present embodiment, the extension 14 </ b> Z is formed using this dummy metal fitting 14, and the extension 14 </ b> Z is disposed on the back surface of the lead portion 31 </ b> E of the center contact 31. Therefore, the composite socket 10 according to the present embodiment has no parts to be added to the conventional composite socket (one that does not have the extension portion 14Z), and the changed portion (extension of the extension portion 14Z) is also extremely high. There is little increase in cost or the like. Further, there is no need to change the mounting conditions on the circuit board.

  Note that the present invention can also be applied to a connector (coaxial socket connector) which is not provided with the multi-pin socket portion 20 and is composed only of the coaxial socket portion 30. However, in the case of such a connector, it is conceivable that the dummy fitting 14 for improving the attachment strength to the circuit board is not provided, and in this case, the dummy fitting 14 is added to the housing of the connector.

It is the perspective view which looked at the compound socket as a connector concerning this embodiment from diagonally upper front. It is the perspective view which looked at the compound socket of Drawing 1 from diagonally upper back. It is the III-III sectional view taken on the line of FIG. It is a perspective view which shows the detail of the center contact of the coaxial socket part of FIG. 2, a GND contact, and a dummy metal fitting.

Explanation of symbols

10 Connector (Composite connector)
11 Housing 14 Dummy metal fitting 14Z Extension part 20 Part where multi-pin plug is fitted (other pin socket part)
30 Part where coaxial plug is fitted (coaxial socket part)
31 Center contact 31E Center lead-out part 32 GND contact 32E GND lead-out part

Claims (5)

A housing having a portion to which a coaxial plug is fitted;
A central contact attached to the housing and capable of contacting the signal terminal of the coaxial plug and connected to the signal pattern of the circuit board;
A GND contact mounted on the housing and capable of contacting the GND terminal of the coaxial plug, and connected to the GND pattern of the circuit board;
A connector provided with a dummy fitting mounted on the housing and connected to the GND pattern of the circuit board,
The center contact has a center lead portion that is led out from the housing toward the signal pattern of the circuit board;
The connector according to claim 1, wherein the dummy metal fitting has an extending portion opposed to the central lead portion with a gap. The GND contact has a GND lead portion that is drawn from the housing toward the GND pattern of the circuit board;
The connector according to claim 1, wherein the GND lead portion and the center lead portion are disposed close to each other.   The connector according to claim 2, wherein the center lead portion, the GND lead portion, and the extending portion are arranged in parallel.   The connector according to claim 1, wherein the extended portion of the dummy metal fitting is embedded in the housing. The housing has a portion into which a multi-pin plug is fitted in addition to the portion into which the coaxial plug is fitted;
The connector according to any one of claims 1 to 4, wherein the dummy metal fitting also serves as a board mounting reinforcing member for fixing the housing to the circuit board.

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