JP2543434B2 - Electrical connector - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a surface-mounting electrical connector, and more particularly to an electrical connector that does not cause any trouble even after heat history such as heating and cooling. .

[Prior Art] Recently, surface mounting technology has been widely used for circuit technology of electronic devices.

In the surface mounting technology, various electronic components are arranged on a substrate having a predetermined circuit pattern, and by heat-treating the electronic components, the circuit pattern on the substrate and the electronic components are soldered to complete an electronic circuit. .

FIG. 1 shows an example of an electrical connector conventionally used in surface mounting technology.

In FIG. 1, reference numeral 1 is a connector body made of an insulating material such as thermoplastic. A required contact 2 made of metal is attached to the body 1, and the contact 2 has a length that reaches the connection terminal of the circuit pattern of the substrate 5 when the connector is attached to the substrate 5. There is a tail 21.

Reference numeral 3 is a lock pin attached to both left and right ends of the body 1. The lock pin 3 is provided with two arms 31 that are divided into two forks, and each arm 31 has a protrusion protruding laterally at the tip thereof. The locking portion 32 is provided. When arranging the connector board, the arm 31 of the lock pin 3 is inserted into the mounting hole 10 provided in the board 5. When the insertion is completed, the connector is temporarily fixed to the substrate to the extent that it can no longer be easily moved by the elastic force of the bifurcated arm 31 of the lock pin 3.

Reference numeral 4 is a metal shell that surrounds a fitting portion with a mating connector (not shown), and 41 is a screw hole for mounting on a panel or the like.

FIG. 2 is a drawing for explaining the state of the connector mounted on the board and the board. Reference numeral 1 denotes the body of the connector mounted on the board 5. In the body 1, a plurality of horizontal and straight lines are arranged. Two upper and lower rows of contact holding holes 11 are provided. Each of the upper and lower two rows of contact holding holes 11
A contact 2 is attached to the.

In FIG. 2, reference numeral 21 is a contact lead attached to the body 1, and 7 is a solder for connecting the contact lead 21 and the terminal 6 of the circuit pattern.

FIG. 3 shows an example of the contact 1 attached to the contact holding hole 11 of the body 1, and 21 is a lead portion of the contact. Reference numeral 22 denotes a contact fitting portion, which is a portion to be fitted and electrically connected to a contact of a mating connector (not shown) to be fitted.

[Technical problem to be solved by the invention] In surface mounting technology, when a component such as a connector arranged on a board is soldered to a terminal of a circuit pattern on the board, a step of heat treatment for soldering In some cases, the contact leads may be soldered while the board is warped due to the difference in thermal properties between the board and the connector.In this case, when the mounted board returns to room temperature after soldering, the board warps. Also returns to its original state and a tensile or compressive force is applied to the contact leads, which causes random deformation of the contact leads. There was a technical problem to be solved, such as cracking or cutting at the soldered portion of the lead.

[Means for Solving the Problem] The present invention has been made in view of the above-mentioned current situation, and has been able to solve the above problems by performing the following means.

Notch grooves extending from both sides of the lead root of the contact toward the fitting portion of the contact are provided, that is, an absorption beam portion is provided near the lead root.

A notch is provided in a portion of the contact holding hole of the body of the connector that corresponds to the absorbing beam portion of the contact when the contact is attached to the body.

[Operation] By taking the above means, the following operation occurs.

Since there is an absorption beam part, even if there is expansion and contraction due to the phase amount of thermal physical properties after the heat history such as heat treatment of soldering and cooling of solidification of solder has passed, the difference is absorbed by the absorption beam part. , Unnecessary expansion and contraction force is not concentrated on the weak points such as between the fitting part and the tail part of the connector or the soldered part.

Since the notch is provided in the contact holding hole at a portion corresponding to the contact beam portion, even if the absorption beam portion moves due to thermal history, the absorption beam portion can move freely, so that mechanical unreasonableness does not occur.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 is an example of a contact used in the electrical connector according to the present invention.

In FIG. 4, 21 is a lead portion and 22 is a fitting portion.

A feature of the contact used in the electrical connector according to the present invention is that the absorption beam portion 24 is provided by making notches 23 from both sides of the root of the lead portion 21 toward the fitting portion 22.

FIG. 5 shows a cross section of a body of the electric connector according to the present invention and a portion where the contact shown in FIG. 4 is attached to this one body.

In FIG. 5, 2 is a contact of the present invention illustrated in FIG. 4, 21 is a lead portion, 22 is a fitting portion, 23 is a notch, and 24 is an absorbing beam portion.

In FIG. 5, reference numeral 1 is a body of the electrical connector according to the present invention, and 11 is a holding hole for mounting a contact provided in the body 1.

The features of the body of the electrical connector according to the present invention are:
When the contact 2 is attached to the holding hole 1 of the body 1,
The notch 12 is provided in the portion of the holding hole 1 corresponding to the absorption beam portion 24 of the contact 2.

In FIG. 5, reference numeral 5 is a wiring board, 6 is a terminal portion of the circuit pattern provided on the surface of the wiring board 5, and 7 is a lead portion 21 of the contact 2 and the terminal portion 6 of the circuit pattern. It is solder.

In the connector according to the present invention described above, even if the lead portion 21 of the contact is pushed upward, the absorbing beam portion 24 follows this, so that an unreasonable force may be applied to the root portion of the lead 24. Or, on the contrary, even if the lead portion 21 of the contact is pulled downward, the holding hole of the body 1
Since the notch portion 12 is provided in the portion 11, the absorbing beam portion 24 of the contact 2 can follow without any trouble, and in this case too, the lead 24 is not subjected to excessive tension.

While the above description was based on female contacts, the present invention
Needless to say, the contact is not limited to the female contact and may be a male contact.

EFFECTS OF THE INVENTION Since the electrical connector according to the present invention has the structure described in detail above, it receives heat history such as heating and cooling during the surface mounting process, so that heat such as expansion and contraction is generated between the substrate and the electrical connector. Even if there is a difference in physical properties, the soldering part between the terminal part of the circuit pattern of the board and the lead end part of the connector, the lead root of the connector, etc. do not cause damage such as peeling or breakage, etc.
The effect peculiar to the present invention is exhibited.

[Brief description of drawings]

FIG. 1 is a perspective view showing a conventional electric connector, FIG. 2 is a sectional view of a wiring board mounting portion of the conventional electric connector, and FIG. 3 is a perspective view of a contact used in the conventional electric connector. . FIG. 4 is a perspective view of a contact used in the electric connector according to the present invention, and FIG. 5 is a perspective view of a wiring board mounting portion of the connector according to the present invention. 1 ... Body, 2 ... Contact, 3 ... Lock pin,
5 ... Wiring board, 6 ... Circuit pattern, 7 ... Solder, 11
…… Holding hole, 12 …… Notch part, 21 …… Lead part, 22 ……
Mating part, 23 ... Notch, 24 ... Absorption beam part.

Claims (1)

(57) [Claims] 1. An insulating body having a holding hole for mounting a contact, a fitting portion inserted into the holding hole of the body and mounted, and a circuit pattern provided on the surface of a wiring board to be mounted from the fitting portion. In the electrical connector, which comprises a contact including a lead portion having a length reaching up to, the contact is provided with a notch extending from both sides of the lead root toward the fitting portion, and the holding hole of the body, An electrical connector in which a cutout is provided in a portion of the contact corresponding to the absorbing beam portion when the contact is attached to the body.