JP2014072183A - Board-to-board connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust fitting holding force in which a contact part for playing a role of electrical connection is not utilized and to secure the stable fitting holding force.SOLUTION: In a board-to-board connector, a plug and a socket is fitted to each other, mutual circuit boards are electrically connected to each other, and holding force is provided by engagement between a recess and a salient, the insertion force and holding force between a plug 10 and a socket 20 are adjusted in accordance with the number of poles by changing height t of the salient, a tilt angle θ1 of the slope in the insertion direction, and a tilt angle θ2 of the slope in the pull-out direction.

Description

The present invention relates to a board-to-board connector that is mounted on a circuit board and engages with a mating connector to transmit an electrical signal.
Specifically, the present invention relates to the adjustment of the insertion force at the time of fitting between the connectors and the holding force at the time of releasing the fitting.

Patent Document 1 describes a connector structure that can obtain a fitting holding force suitable for each number of poles from a low-pole type to a multi-pole type of board-to-board connector. As a method for adjusting the fitting holding force, An invention is disclosed in which a step is provided in a contact portion of a contact and an appropriate fitting and holding force is obtained by changing the size of the step.
More specifically, the flat plate surface of the contact portion 31 of the plug contact 3 receives an elastic contact force from the bent portion 72b of the contact portion 72 of the receptacle contact 7, and the magnitude of the elastic contact force changes before and after the passage of the step.
At the time of insertion, since the step is provided so as to reduce the elastic displacement amount of the contact portion 72 of the receptacle contact 7, the elastic contact force is reduced by the passage of the step.
Since this elastic contact force acts as a holding force in the fitted state, an appropriate fitting holding force can be obtained by adjusting this step.
For example, it is described that when the step difference between the upper step surface and the lower step surface is increased, the fitting holding force is decreased, and when the step difference is decreased, the fitting holding force is increased.

JP 2009-231046

However, the board-to-board connector disclosed in Patent Document 1 has the following problems.
The board-to-board connector fitting and holding force is a force acting when the plug contact 3 is fitted to the receptacle contact 7 and is a force acting when the contact points 72d and 72d abut on the recess 31d. is there.
Accordingly, the contact point 72d slides on the step of the recess 31d, and the contact portion 72d is worn or deformed, which may cause a problem in contact reliability.
In particular, when the level difference is large, it is considered that the risk of occurrence of the problem is further increased.
In addition, it is difficult to define the fitting holding force only by defining the size of the step, and actually it is greatly affected by the inclination angle of the slope connecting the convex portion 31e and the concave portion 31d of the contact portion 31. become.
That is, if the slope is gentle, the fitting holding force is considered to be small.

The present invention has been made in view of the above points, and an object thereof is to provide an electrical connector having the following characteristics.
(1) Adjustment structure of fitting holding force without using a contact portion that carries out electrical connection (2) Ensuring stable fitting holding force

A board-to-board connector for fitting a plug 10 mounted on a circuit board and a socket 20 mounted on another circuit board to electrically connect the circuit boards to each other;
A concave portion is formed in one of the holding portion 12a of the plug terminal 12 of the plug 10 or the holding portion 22a of the socket terminal 22 of the socket 20, and the other is formed with a convex portion.
In the board-to-board connector that gives the holding force by engaging the concave and convex parts,
The convex portion has a trapezoidal cross section, and the insertion force and retention of the plug 10 and the socket 20 are changed by changing the height t, the inclination angle θ1 of the slope in the insertion direction, and the inclination angle θ2 of the slope in the removal direction. Adjust the force according to the number of terminals.

According to the present invention, the following board-to-board connector can be realized.
(1) Since the contact portion is not used for adjusting the holding force, the contact reliability due to wear of the contact portion is not affected.
(2) Since the elasticity of the contact is not used for adjusting the holding force, a stable holding force can be secured without being affected by elastic deformation or the like.

Perspective view of plug 10 Perspective view of socket 20 Plug terminal 12 Socket terminal 22 Dimension setting diagram for each type of protrusion 23 Board-to-board connector mating diagram

Embodiments will be described with reference to FIGS.
The plug 10 includes a plug housing 11 and a plurality of plug terminals 12 as shown in FIG.
The plug terminal 12 is formed by pressing a copper alloy as shown in FIG.
The plug terminal 12 is made up of a terminal portion 12c for solder-connecting to the circuit board, a holding plate portion 12a standing upright from the terminal portion 12c, and a contact portion 12b formed by U-turning the holding plate portion 12a. Yes.
A concave portion 13 having a depth of 0.02 mm is provided in the holding plate portion 12a.
Further, the surface of the holding plate portion 12a and the step between the concave portion 13 are chamfered by 45 °.
The terminal portion 12c and the contact portion 12b are plated with gold.

As illustrated in FIG. 2, the socket 20 includes a socket housing 21 and a plurality of socket terminals 22.
The socket terminal 22 is formed by pressing a copper alloy as shown in FIG.
The socket terminal 22 includes a terminal portion 22c for solder-connecting to the circuit board, a fixing portion 22d rising from the terminal portion 22c at a right angle, a holding plate portion 22a formed by U-turning the fixing portion 22d, and a holding plate portion 22a. And a contact portion 22b formed by U-turning.
The contact portion 22b is a spring having cantilever-like elasticity.
The holding plate portion 22a is provided with a convex portion 23 having a trapezoidal cross section.
The terminal portion 22c and the contact portion 22b are plated with gold.

In general, the board-to-board connector has a repertoire of terminal poles as a series product. For example, in this embodiment, a low-pole type of 10 poles to a multi-pole type of 70 poles are available.
When all terminals have the same shape, the insertion force and holding force are both heavy in the multi-pole type, and the insertion force and holding force are both light in the small-pole type.
Therefore, it is considered that the insertion / extraction operation becomes difficult with the multi-pole type, and problems such as dropping of fitting due to insufficient holding force occur with the low-pole type.

In this embodiment, three types of terminals in which the shape of the convex portion 23 is different depending on the number of poles of the socket terminal 22 are prepared and countermeasures are taken. This will be described with reference to FIG.
The height t of the convex portion 23, the inclination angle θ1 of the slope in the insertion direction, and the inclination angle θ2 of the slope in the removal direction can be changed by exchanging a part of the press die.
The set dimensions of Type 1 are t (1) = 0.04 mm, θ1 (1) = 58 °, and θ2 (1) = 25 °.
The set dimensions of Type 2 are t (2) = 0.02 mm, θ1 (2) = 25 °, and θ2 (2) = 15 °.
The set dimensions of Type 3 are t (3) = 0.01 mm, θ1 (3) = 21 °, and θ2 (3) = 8 °.
The dimensional tolerance of the height t is ± 0.005 mm, and the dimensional tolerances of the inclination angles θ1 and θ2 are ± 3 °.

Since Type 1 has a high height and a large slope angle, the insertion force and holding force can be increased.
Since Type 3 has a low height and a small inclination angle, the insertion force and the holding force can be reduced.
Type 2 is an insertion force and a holding force that are substantially intermediate between type 1 and type 2.

Table 1 sets the type of terminal 22 used for each number of poles of the socket 20.
Specifically, in the low-pole type having 10 or 14 poles, by using the type 1 socket terminal 22, the insertion force when the plug 10 of the board-to-board connector and the socket 20 are fitted, The holding force when releasing the fitting can be adjusted to be higher.
In the case of a multi-pole type having 32 to 70 poles, the insertion force and holding force can be adjusted to be low by using the type 3 terminal 22.
Also, in the middle 16 to 30 poles, the insertion force and holding force can be adjusted by using the type 2 terminal 22.

In this embodiment, the plug terminal 12 is provided with the concave portion 13 and the socket terminal 22 is provided with the convex portion 23. However, the plug terminal 12 may be provided with a convex portion and the socket terminal 22 may be provided with the concave portion.
The recess 13 may be a through hole.
In addition, although the contact portion 22b has an elastic shape, the contact portion 12b may be elastic.

FIG. 6 is a cross-sectional view showing a fitting state of the plug 10 and the socket 20 of the board-to-board connector.
The concave portion 13 and the convex portion 23 are engaged in the fitted state.
The contact portion 12b and the contact portion 22b are in electrical contact when fitted, but neither the contact portion 12b nor the contact portion 22b slides on the concave portion 13 or the convex portion 23, so that the contact reliability is not greatly affected.

10 Plug (board to board connector)
11 Plug housing 12 Plug terminal 12a Holding plate portion 12b Contact portion 12c Terminal portion 13 Recess 20 Socket (Board to board connector)
21 Socket housing 22 Socket terminal 22a Holding plate part 22b Contact part 22c Terminal part 22d Fixing part 23 Convex part

Claims (1)

A board-to-board connector for fitting a plug (10) mounted on a circuit board and a socket (20) mounted on another circuit board to electrically connect the circuit boards to each other,
A concave portion is formed in one of the holding portion (12a) of the plug terminal (12) of the plug (10) and the holding portion (22a) of the socket terminal (22) of the socket (20), and the convex portion is formed in the other. In the board-to-board connector that forms and has a holding force by engaging the concave and convex parts,
The protrusion has a trapezoidal cross section, and the plug (10) can be changed by changing the height (t), the inclination angle (θ1) of the slope in the insertion direction, and the inclination angle (θ2) of the slope in the removal direction. The board-to-board connector is characterized in that the insertion force and holding force of the socket (20) are adjusted according to the number of poles of the terminal.

Images