JPH06231839A - Smt connector - Google Patents

Abstract

PURPOSE:To hold connection against position displacement by providing a male connector having a contact pin movable in accordance with the distance between substrates and a female connector having a metal plate in a specific area brought into press contact with the contact pin. CONSTITUTION:A male connector 11 has a contact pin which can be moved in a vertical direction by a coil spring provided between terminal plates horizontally arranged in a substrate 12. A female connector 10, formed into an integral unit with a terminal plate horizontally arranged in a substrate 13, has a metal plate, with which the contact pin of the male connector 11 is brought into press contact, and a wall for partitioning a region of the metal plate. By opposing these male and female connectors 11, 10 brought into press contact with a fixed distance, signal wires of the substrates 12, 13 are connected. When position displacement is generated in a vertical direction of the connectors 11, 10, connection by a pressure of the contact pin can be obtained, and even when generated position displacement in a horizontal direction, the connector is movable in the wall for partitioning the metal plate. In this way, connection having reliability can be obtained against the position displacement in the vertical and horizontal directions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface mount type connector for connecting circuit boards to each other.

[0002]

2. Description of the Related Art Conventionally, in this type of technology, one connector is fixed to a main board, and the other connector is fixed to an expansion board. By engaging the connectors on the board, the positions of the boards were finally decided and the signal lines were connected. Alternatively, the connection between the substrates has been made by an FPC or a flat cable.

[0003]

However, in the above-mentioned prior art, when the circuit board to which each connector is attached is fixed to the case or the like by a screw or the like before the male connector and the female connector are joined, the case is fixed. Due to misalignment of the boards due to misalignment of the boards in the horizontal and vertical directions, reliable connection cannot be achieved, and in the worst case, the male connector and the female connector do not engage with each other.

The present invention has been made in order to solve such a drawback, and enables reliable joining even when some positional deviations of the connectors are generated in the horizontal and vertical directions. To supply the SMT connector.

[0005]

The SMT connector of the present invention is a means for connecting a circuit board and a signal line of the circuit board, wherein the board and the terminal for connecting to the board arranged horizontally are provided. A male connector having a coil spring or a leaf spring and having a contact pin that can be freely moved according to the distance between the boards, and a terminal horizontally arranged on the board for connection to the board, which is integrated with the male connector. It consists of a metal plate of several mm square on which the contact pins of the connector are pressed, and a female connector having a wall separating the metal plates, and the connection between the male connector and the female connector is set at several mm intervals in horizontal and vertical directions. The feature is that the signal line is connected in correspondence with the positional deviation of.

[0006]

With the coil spring or the leaf spring arranged on the back surface of the contact pin of the male connector, the contact pin moves up and down, so that the male connector and the female connector can be joined by a constant pressure.

[0007]

1 is a perspective view of a female connector for connecting four signal lines according to an embodiment of the present invention, and FIG. 2 is a perspective view of a male connector press-contacted to a female connector 10.

FIG. 3 is a sectional view of the female connector in the embodiment of the present invention. FIG. 4 is a three-sided view showing the outer shape of the metal terminal 1, where (a) is a plan view, (b) is a front view, and (c) is a side view. The metal terminal 1 comprises a metal plate 1a having a region of several mm square and terminal portions 1b arranged on both sides of the metal plate 1a so as to be horizontal to the board for soldering on the board. The metal terminal 1 is molded with resin 2, and the opening 3 forms the metal plate 1a portion for press-contacting the female connector 10. Also, FIG.
As shown in FIG. 3, the metal plate 1 a is separated by a wall 14. The material of the metal terminal 1 is preferably phosphor bronze, the surface of the metal plate 1a is preferably nickel-plated or gold-plated, and the surface of the terminal portion 1b is preferably tin-plated.

FIG. 5 (a) is a sectional view of the male connector in the embodiment of the present invention. Reference numeral 4 denotes the same metal terminal as the metal terminal 1 used for the female connector 10. Reference numeral 5 is a contact pin having a rounded tip. The contact pin 5 is arranged between the contact pin 5 and the metal terminal 1 and is a coil spring 6
Has been pushed upwards by. Even if the coil spring 6 is replaced with a leaf spring as shown by 7 in FIG. 5B, the same effect can be obtained. The pushed up contact terminal 5 is prevented from moving upward by the metal terminal 1, the contact terminal 5, and the claw portion 9 of the resin 8 that molds the coil spring 6. The pressure above the contact pin 5 when stopped is preferably set to around 100 g. The contact pin 5 can be moved in the vertical direction, and even if the male connector 11 and the female connector 10 are misaligned in the vertical direction, connection can be performed by a pressure of about 100 g. By setting a long moving area, there is an advantage that it is not necessary to bring several different connectors depending on the distance between the boards. The material of the contact terminal is also preferably phosphor bronze, and the surface is preferably plated with nickel or gold. By setting the height of the metal terminal 1 to 1 mm, the moving area of the contact pin 5 to 2 to 3 mm, and the height of the contact pin 5 to 1 mm,
The total height of the male connector 11 is 4 to 5 mm, the height of the female connector 10 can be set to 2 mm, and the minimum distance between boards can be 6 to 7 mm. Also, by providing a cavity inside the contact pin 5 and reducing the moving area of the contact pin, and arranging the coil spring 6 inside the contact pin 5, it is possible to keep the distance between the substrates within 5 mm. is there.

FIG. 6 is a sectional view showing the embodiment of the present invention in the engaged state of the female connector and the male connector. Figure 6 (b)
, The male connector 11 mounted on the board 12 by soldering and the female connector 10 also mounted on the board 13 by soldering are pressed against each other with a certain fixed distance, A signal line is connected between the substrate 12 and the substrate 13.
The board 12 and the board 13 are separately fixed to the case by a method such as screwing, and the male connector 11 and the female connector 10 are aligned with each other when the case is assembled. Addition of case dimensional tolerance, dimensional tolerance such as board hole position, board mounting tolerance, case matching tolerance, etc. ± 1.0mm no matter how close the tolerance is.
There will be some misalignment. Therefore, the female connector 10
By setting the metal plate 1a of 3 mm square and separating the metal plates 1a from each other by the wall 14, there is a horizontal positional deviation as shown in FIGS. 6 (a) and 6 (c). Even if it occurs, a connection with sufficient reliability is possible. Further, as shown in the sectional view of the female connector in FIG. 3, the wall 14 is inclined, and a large gap is provided between the contact pin 5 and the resin 8 in FIG. 5 (a). Therefore, when the metal plate 1a of the female connector 10 is set to 3 mm square, the positional deviation is ± 1.5 mm.
Tolerable to some extent.

The female connector 10 can be substituted by providing a land on the substrate and plating the land with gold. However, if a land is provided on the board and gold plating is applied only to the land, the cost of the board will increase, and if there is no wall between the lands, the connection between terminals that are misaligned or short-circuiting will be unreliable. Since there are points, it is desirable to use the female connector 10.

It is desirable to set the pitch between terminals to about 4 mm, and it is appropriate to use about 8 terminals for the number of terminals. In that case, the external shape of the connector is 32 mm in length × 5 mm in width.

[0013]

As described above, according to the present invention, it is possible to provide an SMT connector capable of reliable joining even if the male connector and the female connector are slightly displaced in the vertical and horizontal directions. can do.

[Brief description of drawings]

FIG. 1 is a perspective view of a female connector showing an embodiment of the present invention.

FIG. 2 is a perspective view of a male connector showing an embodiment of the present invention.

FIG. 3 is a sectional view of a female connector showing an embodiment of the present invention.

FIG. 4 is a diagram of a metal terminal for an SMT connector of the present invention.

FIG. 5 is a sectional view of a male connector showing an embodiment of the present invention.

FIG. 6 is a cross-sectional view of the female connector and the female connector in the engaged state according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal terminal 1a Pressure contact surface 1b Terminal part 2 Resin 5 Contact terminal 6 Coil spring 9 Claw part 10 Female connector 11 Male connector 12 Board 14 Wall

Claims (1)

[Claims] 1. A means for connecting a circuit board and a signal line of the circuit board, wherein a coil spring or a leaf spring is arranged between the board and a terminal for connecting to the board arranged horizontally, and between the boards. A male connector having a contact pin that can freely move according to the distance and a terminal for connecting to the substrate horizontally arranged on the substrate are integrated with each other. A metal plate, a female connector having a wall separating the metal plates, the connection between the male connector and the female connector is set at a pitch of several mm, and the signal line is also compatible with positional deviation in the horizontal and vertical directions. An SMT connector characterized by making a connection.