JPH0582078U - Connection structure on circuit board - Google Patents

Abstract

(57) [Abstract] [Purpose] To ensure that an electrical connection between an external connector terminal and a land portion of a circuit board can be made reliably and with almost no external force acting on the board. [Constitution] A conical coil spring 16 made of a conductive material is installed on a land portion 15 on the printed wiring board 1, and is joined and fixed by a solder 17. Connector part 11 of upper case 10A
The inner end portion of the external connector terminal 12 provided on the upper case 1
By fitting 0A and the lower case 10B, the coil spring 16 is inserted into and brought into contact with the inside of the coil spring 16, and the external connector terminal 12 and the land portion 15 are electrically connected via the coil spring 16.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a connection structure in a circuit board for electrically connecting a printed wiring board and an external connector terminal.

[0002]

[Prior Art]

 When electrically connecting the printed wiring board arranged inside the case and the external power supply, the method of using the connector terminal and the connector as shown in FIGS. 4 and 5 is the most general method. That is, FIG. 4 shows a structure in which the connector terminal 2 is fixed to the printed wiring board 1 by soldering, and the connector 3 of the external cord is inserted and connected to the connector terminal 2. In FIG. A structure in which the end portion of the printed wiring board 1 is held, and this is joined and fixed to the land portion of the printed circuit formed on the board with solder, conductive adhesive, etc., and the connector is inserted into the E-type terminal 4 for connection Is.

[0003]

[Problems to be solved by the device]

 However, in the former connection structure using the connector terminals 2 described above, although the connector 3 can be firmly fixed, the connector 3 occupies a large area with respect to the printed wiring board 1, so that the mounting density of electronic components is reduced. There was a problem of letting it. In the latter connection structure using the E-type terminal 4, when a large force is applied to the connector 4, there is a problem that disconnection occurs between the substrate 1 and the terminal 4.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to electrically connect an external connector terminal and a land portion of a circuit board with a simple structure. Another object of the present invention is to provide a connection structure in a circuit board that can be surely performed with almost no external force applied to the board.

[0005]

[Means for Solving the Problems]

 In order to achieve this object, the circuit board connection structure according to the present invention is such that a coil spring made of a conductive material is fixed to a land portion on a printed wiring board, and an external connector terminal is inserted into and brought into contact with the coil spring. The land portion and the external connector terminal are electrically connected to each other.

[0006]

[Action]

 In the present invention, the coil spring is soldered on the land portion formed on the printed circuit board and joined by a conductive adhesive or the like, and the external connector terminal is inserted and comes into contact with the external connector terminal. The land part is electrically connected.

[0007]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. FIG. 1 is a sectional view of an essential part showing an embodiment of a connection structure in a circuit board according to the present invention, and FIG. 2 is a perspective view of an essential part of a printed wiring board. In these figures, 10 is a case for accommodating the printed wiring board 1. The case 10 is a shallow box type, which is formed by resin injection molding into upper and lower halves and integrally coupled by a set screw (not shown). It is composed of an upper case 10A and a lower case 10B.

A connector portion 11 to which the connector 3 provided at one end of the external cord is fitted is integrally provided on one side of the upper surface of the upper case. The connector portion 11 is formed of a tubular body, and a plurality of external connector terminals 12 are arranged side by side inside thereof. These external connector terminals 12 are disposed so as to penetrate the bottom surface of the connector portion 11 so that their inner ends are located inside the case.

A board supporting portion 13 is integrally formed on the inner bottom surface of the lower case 10B so as to project therefrom. The printed wiring board 1 is installed on the board supporting portion 13 and a plurality of set screws (see FIG. It is fixed by (not shown). A conductive foil 14 that forms an electric circuit is formed on the upper surface of the printed wiring board 1, and various electronic components (not shown) such as resistors, capacitors, and transistors are mounted on the printed wiring board 1, and the external connectors are also provided. On the land portion 15 of the conductive foil 14 provided corresponding to the terminal 12, there is a conical coil spring 16 formed of a metal material having good conductivity, with the large diameter end side facing up and the small diameter end side facing up. Is placed on the bottom and is joined by the solder (or conductive adhesive) 17. The maximum coil diameter of the coil spring 16 is larger than the outer diameter of the external connector terminal 12, and the minimum coil diameter is set small.

In the connection structure having such a structure, when the upper case 10A is fitted into the lower case 10B, the inner end portion of the external connector terminal 12 is inserted into the coil spring 16 and some coil wires of the coil are inserted. Since it comes into contact with the wheel, it is electrically connected to the land portion 15 via the coil spring 16. Here, the coil spring 16 is not limited to the conical type, and a cylindrical type coil spring can be used. However, when the conical type coil spring is used, the external connector terminal 12 and the land portion 15 are slightly different. Even if they are misaligned, the external connector terminal 12 can be surely inserted into and contact with the inside of the coil spring 16, so that high positioning accuracy is not required and the assembling work is easy. Further, the coil spring 16 prevents a large force from being applied to the printed wiring board 1 itself only by compressing the coil wire ring contacting the external connector terminal 12 downward.

FIG. 3 is a front view showing another embodiment of the present invention. In this embodiment, a cylindrical coil spring 20 is used instead of the conical coil spring. The cylindrical coil spring 20 is placed sideways on the land portion 15 and joined by solder (or conductive adhesive) 17, and the inner end portion of the external connector terminal 12 is located between the adjacent coil windings. The external connector terminal 12 and the land portion 15 are electrically connected to each other by being inserted into and contacting. Even with such a configuration, the same effect as that of the above-described embodiment can be obtained.

[0012]

[Effect of the device]

 As described above, according to the present invention, the coil spring is bonded and arranged on the land portion of the circuit board with a solder or a conductive adhesive, and the external connector terminal is inserted into the coil spring and brought into contact with the coil spring. Since the land part and the external connector terminal are configured to establish electrical continuity, the external connector can be reliably connected to the circuit board, and even if the land part and the external connector terminal are slightly misaligned. The advantage is that it does not require high positioning accuracy, is easy to assemble, and the coil spring is elastically deformed when the external connector terminal comes into contact, so that it can be connected without applying a large external force to the circuit board itself. There is.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of a connection structure in a circuit board according to the present invention.

FIG. 2 is a perspective view of a main part of a printed wiring board.

FIG. 3 is a front view showing another embodiment of the present invention.

FIG. 4 is a diagram showing a conventional example of a connection structure.

FIG. 5 is a diagram showing another conventional example of the connection structure.

[Explanation of symbols] 1 printed wiring board 2 connector terminal 3 connector 4 E-type terminal 10 case 10A upper case 10B lower case 11 connector section 12 external connector terminal 14 conductive foil 15 land section 16 conical coil spring 17 solder 20 cylindrical coil Spring

Front page continuation (72) Kozo Uga, 1-4, Fujimi-cho, Gyoda-shi, Saitama Prefecture, within Jeco Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A coil spring made of a conductive material is fixed to a land portion on a printed wiring board, and an external connector terminal is inserted into and brought into contact with the coil spring to electrically connect the land portion and the external connector terminal. A connection structure in a circuit board, characterized in that