JPH07153508A - Connector surface mounting structure - Google Patents

Abstract

PURPOSE:To simultaneously enhance reliability in a solder connection part and ensure a stress relaxation in simple structure by utilizing a stress relaxation part formed on a contact. CONSTITUTION:A stress relaxation shape 41 for relaxing stress is formed on a contact 39 between an insulating housing 31 and a connecting surface 43a. By accommodating the stress relaxation shape 41, an escape hole 47 for restricting the movement of the contact 39 is made in a circuit board 37.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface mounting structure for fixing a connector to a circuit board, and more particularly, to use a stress relaxation shape portion formed on a contact of a connector for regulating movement of the contact. Is.

[0002]

2. Description of the Related Art In a surface mount type connector, it is preferable that a contact is in a stable contact state with a circuit board prior to soldering. As an example of this type of surface mount connector in which the tips of the contacts are inserted into the pores of the pad surface, the one described in Japanese Utility Model Laid-Open No. 3-52964 will be described with reference to FIG. FIG. 4 is a perspective view of a connector surface mounting structure in which a contactor is inserted into a pad. In the figure, 1
Is a circuit board, on the upper surface of which a conductive pad surface 3 for connection with a contact of a connector is formed. The pad surface 3 has a pore 5 penetrating the circuit board 1, and the inner surface of the pore 5 is continuous with the pad surface 3. Connector 7
Has an insulating housing 9 and a plurality of thin plate-shaped contacts 11 planted in the insulating housing 9. The plurality of contacts 11 extend parallel to the circuit board 1 and are bent downward in a crank shape to include a contact surface 13 that comes into contact with the pad surface 3 of the circuit board 1. Further, the tip of the contact surface 13 is thin. The ridge portion 15 is bent downward.

In the surface mount type connector having such a structure, cream solder is previously applied to the pad surface 3 before connection.
Is applied to each of the contact pieces 11 of the connector 7 so that the connecting surface 13 of each contact 11 contacts the corresponding pad surface 3 and the ridges 15 are formed in the pores 5.
After the connector 7 is positioned in the position and the connector 7 is positioned and fixed to the circuit board 1, solder welding is performed. As a result, the position of the pad surface 3 and the contact surface 13 can be stably regulated without shifting.

On the other hand, the contact of the connector receives a stress generated at the time of connecting / disconnecting the connector, and therefore, it is desirable that the contact has a structure that alleviates this stress. A surface mount type connector of this type having a stress relaxation shape portion in the contact will be described with reference to FIG. FIG. 5 is a side view of a connector in which the contact has a stress relaxation shape portion. In the figure, 17
Reference numerals 19 and 19 respectively denote a circuit board and an insulating housing, and reference numeral 21 denotes a contactor in which, for example, an arc-shaped stress relaxation shape portion 23 is formed. In this connector, the stress relaxation shape part 2
By providing 3 to the contactor 21, the stress due to vibration, the stress due to the temperature difference, the stress caused at the time of connecting / disconnecting the connector can be relaxed with a simple structure, and the durability of the contactor 21 can be improved.

[0005]

However, if it is attempted to achieve stable position regulation before soldering and stress relaxation of the contact at the same time, the ridge portion 15 and the stress relaxation shape portion 2 are required.
Since 3 must be formed on the contactor together, the molding of the contactor becomes complicated and the cost increases.

Further, in the structure in which the protrusion 15 is inserted into the fine hole 5, when the insulating housing 9 is attached to the circuit board 1 by screw fixing, the insulating housing 9 swings in the tightening direction with the screw as a shaft and becomes thin. There is also a problem that the ridge portion 15 has insufficient strength and is deformed. If the pad surface 3 and the contact surface 13 are displaced due to the deformation of the protruding portion 15, the applied cream solder may be dispersed, the amount of solder may be varied, and the reliability of soldering may be reduced.

The present invention has been made in view of the above situation, and the position of the pad surface and the contact surface is utilized by utilizing the stress relaxing portion formed on the contactor without forming a thin ridge portion. An object of the present invention is to provide a connector surface mounting structure that can be regulated, and at the same time to improve reliability of a solder connection portion and to secure a stress relaxation function with a simple structure.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, a structure of a connector surface mounting structure according to the present invention is such that a contact is projected from an insulating housing of a connector fixed to a circuit board and the connector is mounted on the circuit board. In a connector surface mounting structure in which a connection surface to be soldered to a formed pad surface for electrical connection is formed on the contactor, a stress relaxation shape portion for relaxing stress generated in the contactor is provided with the connection surface and the insulation. The circuit board is characterized in that an evacuation hole is formed in the contact between the housing and the housing and accommodates the stress relaxation shape portion to restrict movement of the contact.

[0009]

[Function] The stress relaxation shape portion is inserted into the retraction hole, the movement of the contact is restricted, and the connecting surface and the pad surface do not move relative to each other even when the insulating housing is fixed, so that the connecting surface and the pad surface are The cream solder sandwiched between will not come apart. At the same time, the stress relaxation shape portion is present in the retraction hole, the stress generated in the contact is relaxed by this stress relaxation shape portion, and the fatigue of the contact child is reduced. In addition, the movement is restricted by the stress relaxation shape part where a part of the contact is bent, and the proof force when restricting the movement is larger than the conventional thin ridge portion, and the narrow width processing is eliminated, Molding becomes easier.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a connector surface mounting structure according to the present invention will be described in detail below with reference to the drawings. 1 is an exploded perspective view of a surface mounting structure of a connector of the present invention, FIG. 2 is an enlarged detailed view showing a mounting state of contacts, and FIG. 3 is a side view of a circuit board to which a connector is fixed. Insulation housing 3
A screw fastening portion 33 is formed on the side surface of the
3 is fixed to the circuit board 37 by screws 35. A thin plate-shaped contactor 39 is planted on the rear surface of the insulating housing 31,
The base of the contact 39 projects in parallel with the circuit board 37. The tip side of the contact 39 is bent in the direction of the circuit board 37, and the tip is a stress relaxation shape portion 41 bent and formed in a semi-arcuate shape. The stress relaxation shape portion 41 has a function of absorbing and relaxing the stress (stress) generated in the contact 39. At the end of the stress relaxation shape portion 41, a connecting portion 43 is again bent in parallel with the circuit board 37, and the connecting portion 43 has a surface facing the circuit board 37 as a connecting surface 43a. Contact 39 formed in this way
The connector 45 is configured by arranging a plurality of the above in the insulating housing 31.

On the other hand, a withdrawal hole 47 is formed in the circuit board 37, and the withdrawal hole 47 is for inserting the stress relaxation shape portion 41 when the insulating housing 31 is fixed at a predetermined position. That is, when the insulating housing 31 is fixed,
The stress relaxation shape portion 41 is inserted into the retracting hole 47, and the movement of the contact 39 is restricted via the stress relaxation shape portion 41. A conductive pad surface 49 for connection with the contact 39 is formed near the evacuation hole 47, and the pad surface 49 comes into contact with the connection surface 43a of the connection portion 43. At the time of soldering, cream solder is applied to the pad surface 49 in advance, and the connection surface 43a of the contact 39 is brought into contact with the portion. Contact 39,
The connector mounting structure according to the present embodiment is configured with the stress relaxation shape portion 41, the connecting portion 43, the escape hole 47, and the pad surface 49 as main members and portions.

To mount the connector 45 on the circuit board 37 in the connector mounting structure thus constructed,
First, cream solder is applied to the pad surface 49 in advance. Next, the stress relaxation shape portion 41 of the contact 39 is attached to the circuit board 37.
The screw tightening portion 33 of the insulating housing 31 is fixed to the circuit board 37 with the screw 35. Then, after the connector 45 is fixed, the circuit board 37 is passed through a reflow oven and the solder paste is welded to complete the soldering of the connection surface 43a and the pad surface 49.

In this connector surface mounting structure, when the stress relieving shape portion 41 is inserted into the retreat hole 47, harmful movement of the contact 39 (movement that causes cream solder dispersion, which will be described later), is restricted, and the insulating housing is restrained. Even when the insulating housing 31 is rotated left and right when the screws 31 are fixed, the connecting surface 4
3a and the pad surface 49 do not move relative to each other. Therefore, the temporary holding before soldering becomes stable, the cream solder sandwiched between the connection surface 43a and the pad surface 49 does not vary, and the amount of solder after soldering does not vary.

Further, the stress relieving shape portion 41 is still present in the retreat hole 47, so that the stress caused by the vibration, the stress due to the temperature difference, and the stress generated at the time of connecting / disconnecting the connector are alleviated. Therefore, the durability of the contact 39 is improved. Therefore, in the connector surface mounting structure according to the present embodiment, the stress relaxation shape portion 41 that relaxes the stress also serves as a stopper that restricts the movement of the contact 39, so that the stress relaxation and the displacement prevention are achieved at the same time. It will be.

Further, since the contact 39 is restricted by the stress relaxation shape portion 41, the thin ridge portion 15 is formed as in the conventional case.
As compared with (see FIG. 4), the proof stress at the time of restricting the movement is increased, and the contact 39 is less likely to be deformed. Furthermore, since the stress relaxation shape portion 41 bent with the same width as the contactor 39 is inserted, the narrow width processing such as the protruding portion 15 is eliminated, and the contactor 39 can be molded easily.

In this embodiment, the stress relaxation shape portion 41
Is a semi-circular shape, the stress relaxation shape portion 41 has a shape capable of relaxing stress and restricting the position,
For example, it may be V-shaped or U-shaped.

[0017]

As described in detail above, according to the connector surface mounting structure of the present invention, since the stress relaxation shape portion is inserted into the retraction hole and the movement of the contact is restricted, when the connector is fixed. Also in this case, the connection surface and the pad surface do not move relative to each other, the cream solder sandwiched between the connection surface and the pad surface does not disperse, and the reliability of the solder connection portion can be improved. Further, after soldering, the stress generated in the contact is relaxed by the stress relaxation shape portion, and the fatigue of the contact is reduced, so that the durability of the contact can be improved. Further, as compared with the conventional narrow ridge portion, the narrow width processing is eliminated, so that the contactor can be easily formed.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a connector surface mounting structure according to an embodiment of the present invention.

FIG. 2 is an enlarged detail view of an essential part showing a mounting state of the contact in FIG.

FIG. 3 is a side view of a circuit board to which the connector of FIG. 1 is fixed.

FIG. 4 is a perspective view of a conventional connector surface mounting structure in which a contact is inserted into a pad.

FIG. 5 is a side view of a connector according to another conventional example in which a contact has a stress relaxation shape portion.

[Explanation of symbols]

 31 Insulation Housing 37 Circuit Board 39 Contact 41 Stress Relaxation Shape 43 Connection Portion 43a Connection Surface 45 Connector 47 Retraction Hole 49 Pad Surface

Claims (1)

[Claims] 1. A contact is projected from an insulating housing of a connector fixed to a circuit board, and a connection surface to be soldered to a pad surface for electrical connection formed on the circuit board is formed on the contact. In the connector surface mounting structure according to claim 1, a stress relaxation shape part for relaxing stress generated in the contact is formed in the contact between the connection surface and the insulating housing, and the stress relaxation shape is housed to accommodate the stress relaxation shape. A surface mounting structure for a connector, wherein an evacuation hole for restricting movement of a contact is formed in the circuit board.