JPH051597B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention involves fixing a circuit board along the back surface of a connector case, and directly soldering one end of a terminal protruding from a connector block to the circuit of this board. Related to circuit board connectors.

[Prior art]

As shown in Fig. 3, a junction block with a circuit board (connection connector) is made by arranging and integrating a plurality of single connector blocks 3 in which terminals 2 are attached to a resin case 1, and connecting a connector 4 consisting of the above to a circuit board. After fixing with screws, resin caulking, etc. on P, one end of the terminal that protrudes from each connector block and is inserted into the board is soldered onto the circuit of the board (A in the figure is the solder part) to complete. do.

Incidentally, in the conventional connector employed in this junction block, the resin case 1 of each connector block is integrated via a plate 6 extending from a terminal support wall 5.

[Problem that the invention seeks to solve]

However, in a connector case in which the terminal support wall and connection plate of each connector block are integrated into a single plate, the coefficient of thermal expansion of the resin material is about 5 to 10 times higher than that of, for example, a printed circuit board. Therefore, the amount of expansion and contraction in the lateral direction is large due to temperature changes, and as a result, the terminals are tilted due to misalignment of the terminal insertion holes of the connector case and the circuit board, and the board is warped, causing tension and compression on the solder area A. When stress is applied and the stress is repeated, cracks may occur in the solder area, cutting off electrical continuity.

Therefore, as a countermeasure for this kind of problem,
Japanese Patent No. 139584 discloses that the connector body is made of an elastic material such as rubber, and that a cutout is provided to allow the body to expand and contract.

However, in such a connector, the terminals are supported by an elastic body, resulting in poor support stability. Also, the body is flexible,
Also, the ease of attaching and detaching the connector may deteriorate due to a difference in coefficient of thermal expansion between the connector and the mating connector.

For this reason, in general, each connector block is individually attached to the board and soldered to prevent large stress from being applied to the soldered parts of the board and terminals. , handling of the connector block and attachment to the board become troublesome. Therefore, the present invention attempts to make it possible to absorb the stress described above without making each connector block independent.

[Means for solving problems]

In order to solve this problem, the present invention provides a connector in which a plurality of connector blocks are arranged side by side and integrated as described above, in which a thinned part for absorbing stress is provided at least at the connection part of the resin case of each connection block. It was. Figure 1 shows its basic configuration, where the resin case 1 is thinned to leave only a thin, flexible connection frame 7 with a small cross-sectional area at the part that connects each case to the terminal support wall 5. A portion 8 is formed.

In this way, when a thinned part is provided in the connecting part that was conventionally connected with a plate, the lateral expansion and contraction stress of the connector case is alleviated by the gap between the thinned part and the flexure of the connecting frame, so that the terminal 2 The amount of inclination becomes smaller, and the stress acting on the solder portion A is reduced. Therefore, cracks in the solder portion are reduced and good electrical continuity is maintained.

Note that a similar thinned part may be provided on the terminal support wall 5 of the case 1, avoiding the terminal mounting part, and in this case, the effect of protecting the solder part is further enhanced.

〔Example〕

FIG. 2 shows an embodiment of the invention. This connector 4 is a combination of a plurality of connector blocks 3 having round pin terminals 2a and plate terminals 2b. ,
A part of the terminal support wall 5 surrounded by the frame 9 of the case 1 and the connection part connecting the resin cases 1 of each connector block is formed with a thinned part 8 penetrating therethrough. Also,
Each case 1 is connected via a connecting frame 7 having a small cross-sectional area.

Note that the thinned portion of the case connecting portion does not need to be a hole, and may be formed by cutting out an integrated plate from the outside.

〔effect〕

In the connector of the present invention configured as described above, the lateral stress acting on the entire connector case is broken at various places by the thinned portion provided at least at the connecting portion of the resin case, and the lateral stress acting on the entire connector case is broken at various places, and the bending of the connecting frame As a result, the absolute amount of expansion and contraction of the entire case is kept small, and the amount of inclination of the terminal due to the difference in thermal expansion coefficient between the connector case and the circuit board is reduced. Therefore, stress applied to the solder portion is also reduced, and reliability regarding maintaining electrical continuity is improved.

In addition to reducing the absolute amount of expansion and contraction of the connector case, in the case of connector blocks arranged randomly as shown in Figure 2, the stress applied to the case is distributed in all directions, so the warpage of the case is also reduced. Therefore, the stress acting on the solder portion of the terminal in the direction of the terminal is also relieved, and good connectivity with the mating connector is maintained.

In addition, since the case is made of ordinary resin, the support stability of the terminals is maintained, and the ease of attaching and detaching the connector is not adversely affected. In addition, since each connector block is integrated, the advantages of an integrated connector can be utilized as is with respect to the handling of the connector block and the ease of attaching it to the board.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the basic structure of the connector of the present invention, FIG. 2 is a plan view of the connector of the embodiment, and FIG. 3 is a sectional view of a conventional connector. DESCRIPTION OF SYMBOLS 1... Resin case, 2... Terminal, 3... Connector block, 4... Connector, 5... Terminal support wall, 7... Connection frame, 8... Thinning part, 9...
case frame.

Claims (1)

[Scope of Claims] 1. A circuit board connector in which a plurality of connector blocks using resin cases are arranged side by side and integrated via a resin connection plate that connects the terminal support walls of each connector block, wherein at least the connection plate A circuit board connector characterized in that a thinned part for absorbing stress is provided in the connector block, and adjacent connector blocks are connected by a thin, flexible connecting frame with a small cross-sectional area left at the connecting part. 2. The circuit board connector according to claim 1, wherein the terminal support wall is also provided with a thinned part for absorbing stress at a position avoiding the terminal mounting part.