JPH0896899A - Electrical connector - Google Patents

Abstract

(57) [Abstract] [Purpose] A first object is to provide an electrical connector having a contact terminal that does not come off when the cable is soldered. [Structure] The contact terminal 1 holds a core wire 12 on a side opposite to the contact part 4 and adjacent to the wire connection part 2, and holds the core wire 12 temporarily.
The holding portion 3 has a flat plate shape bent at an angle of inclination with respect to the connection surface, and is formed with a groove portion 6 which is opened toward the end. The groove portion 6 is formed at least at a part of the edge portion of the core wire 12. It has a narrow portion 7 having a groove width smaller than the diameter, and the core wire has a narrow portion 7.
After being inserted into the inner part of the groove part 6 through the above, the holding part 3 can be plastically deformed by the external force so as to narrow the groove width of the groove part 6 and hold the core wire 12.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to electrical connectors.

[0002]

2. Description of the Related Art In an electrical connector, contact terminals are embedded in an insulator. The contact terminal usually has a contact portion on one end side for connection with a contact terminal of a mating connector, and a connection portion for soldering a cable on the other end side. For example, as shown in FIG. 6 of the accompanying drawings, the connection portion of the contact terminal is partially cut away in parallel to the axis to form a semi-cylindrical portion 51, and the coating is removed at the end portion. The exposed core wire 52 of the cable was placed on the semi-cylindrical portion 51, and both were connected by solder. As another form, as shown in FIG. 7, a slit 54 is formed in the axial direction in a cylindrical connection portion 53, and the connection portion 5 is formed by the slit 54.
A method has also been used in which a core wire is inserted while elastically expanding the diameter of 3, and soldering is performed through the slit 54.

[0003]

However, in the contact terminal of the type shown in FIG. 6, the core wire 52 placed on the semi-cylindrical portion 51 may come off immediately before or during solder connection. Further, even after the solder connection, the solder may be peeled off due to an external force when the connector is stored and handled during transportation, and the connection may be disconnected.

In the wire connection system of the type shown in FIG. 7, since the core wire is inserted into the cylindrical wire connection portion 53, there is almost no chance that the core wire will come off during or after solder connection. However, in order to hold the core wire at the connection portion 53, the inner diameter of the connection portion 53 is required to be substantially the same as the diameter of the core wire. In such a case, it is often the case that the core wire cannot be smoothly inserted into the connection portion 53 or is difficult to insert. In particular, when the core wire is formed by twisting a plurality of thin wires, some thin wires are untwisted and separated.

The present invention solves the problems of the conventional electric connector, and provides an electric connector having a contact terminal which is easily soldered and whose core wire does not come off even if an external force is applied after soldering. That is the first purpose. A second object is to provide an electric connector in which the contact portion of the contact terminal does not tilt or move even if the cable receives an external force after the solder connection.

[0006]

According to the present invention, the above object is to provide a contact portion which is made by stamping and bending a metal plate and is implanted in an insulator of a connector to contact a contact terminal of a mating connector. , An electrical connector having a contact terminal having a connection portion having a connection surface for soldering the core wire of the cable, the contact terminal holding the core wire at a position adjacent to the connection portion on the side opposite to the contact portion. The holding portion has a holding portion to be stopped, the holding portion is formed into a flat plate shape bent at an inclination angle with respect to the connection surface, and a groove portion that is opened toward the end is formed, and the groove portion is at least a part of the edge portion of the core wire. The core wire has a narrow portion having a groove width smaller than the diameter, and after the core wire is press-fitted into the inner portion of the groove portion through the narrow portion, the holding portion is plastically deformed by external force so as to narrow the groove width of the groove portion Achieved by being able to pinch That.

Further, in the first invention, the groove is
It is desirable that the open side is substantially V-shaped and the back side is substantially rounded, and that a narrow portion is formed at a transition portion from the substantially V-shaped portion to the substantially rounded portion.

A second object of the present invention is that, in the above-mentioned first invention, the contact terminal has a contact portion so as to extend in a direction perpendicular to the connection surface to the side opposite to the connection side, and the insulator is a cylindrical portion of the outer conductor. A dielectric that is held inside, and the dielectric has an insertion hole that penetrates from the back to the front surface for receiving the contact portion, and two support points that support the connection portion on the side opposite to the connection surface. And the connection portion has a protrusion protruding toward the connection surface side between the two support surfaces, and the dielectric has a lid portion extending from the back surface and bendable from the extension base portion. However, the lid portion is formed with an abutting surface that abuts the protrusion when bent.
This is achieved by maintaining a bent shape of the lid portion by plastically deforming a part of the outer conductor.

[0009]

In the first aspect of the present invention having such a structure, the core wire of the cable is press-fitted so as to cross the groove of the holding portion. A narrow portion is formed in the groove portion, and the core wire is pushed into the narrow portion and enters the inner portion thereof. At this time, the tip portion of the core wire comes to be located on the connection surface of the connection portion. Next, an external force is applied to the holding portion so as to narrow the groove portion to plastically deform the holding portion,
Hold the core wire. Then, the core wire is soldered to the connection surface.

In the second invention, the contact portion of the contact terminal to which the core wire is soldered in the first invention is inserted into the insertion hole of the dielectric body from the back side of the dielectric body which is an insulator.
The connecting portion is supported by the supporting surface of the dielectric at two points on the surface opposite to the connecting surface. In this state, a part of the outer conductor is plastically deformed to bend the lid portion of the dielectric body, and the contact surface of the dielectric body presses the protrusion formed on the connection portion. That is, since the connection part is supported by the projection on the connection surface side and at two positions sandwiching the projection on the opposite surface, the contact part is inclined even if the cable receives an external force. It never moves.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a plan view of the contact terminal of this embodiment, and FIG.
1 is a sectional view taken along line II-II in FIG. 1, and FIG. 3 is III-II in FIG.
It is a III sectional view.

In the figure, the contact terminal 1 is formed by punching and bending a metal plate, and has a connecting portion 2, a holding portion 3 and a contact portion 4.

The connection portion 2 has a flat connection surface 5 having a sufficient size for soldering the core wire of the cable on one surface thereof, and the holding portion 3 has an inclination angle on the connection surface 5 side. It is bent and formed in a V-shaped open shape in FIG. The holding portion 3 is formed with a groove portion 6 which is opened toward the end side, and has a V-shaped portion 6A on the open side and a round portion 6B on the inner side. At the opposite edge of the groove portion 6, the V
A narrow portion 7 that narrows the groove width is formed at a transition portion from the character portion 6A to the round portion 6B. The interval between the narrow portions 7 formed at the opposing transition portions can be slightly smaller or larger than the diameter of the core wire of the cable. When the diameter of the core wire is slightly smaller than the diameter of the core wire, the core wire is press-fitted over the narrow portion 7.

In the present invention, the shape of the groove 6 is not limited to the above shape. For example, the V-shaped portion 6A may have a curved shape that expands toward the open side, and the round-shaped portion 6B may have an elliptical or polygonal shape instead of the round shape. In short, it is important that the narrow portion 7 is formed.

Further, the V-shaped holding portion 3 can be plastically deformed so as to narrow the interval between the narrow portions 7 without breaking by appropriately applying an external force with a tool.

As a preferred embodiment of the present invention, the connecting portion 2 is provided with a protrusion 8 on the side opposite to the holding portion 3. The projecting portion 8 is projected toward the connecting surface 5 side by embossing so as to form a substantially hemispherical surface, and the height from the connecting surface 5 to the top of the projecting portion 8 is higher than that of the tip portion of the holding portion 3. It is slightly higher.

A flat plate-shaped contact portion 4 extends in a direction opposite to the projecting direction of the projecting portion 8 on both side edges of the wire connecting portion 2. That is, it is bent and formed in a direction substantially perpendicular to the connection surface 5 of the connection portion 2. As shown in FIG. 3, the contact portion 4 is inclined toward the tip end portion so as to slightly narrow the gap between the opposing edges, and the gap of the narrowest portion 4A is larger than the size of the fitting portion of the contact terminal of the mating connector. Is also small, and elastically deforms and contacts when the contact terminal of the mating connector is fitted.

The core wire of the cable is soldered to the contact terminal 1 in the following manner.

First, as shown in FIG. 4, the outer cover 11 and the like are peeled off by a predetermined length at the end of the cable 10 to expose the core wire 12. In the present embodiment, the cable 10 is a coaxial cable, the outer cover 11 has a shielded wire 13 and an inner insulating layer 14, and the core wire 12 includes the outer cover 11, the shielded wire 13 and the inner insulating layer 14. Is exposed for a predetermined length.

Next, the exposed core wire 12 is introduced into the groove portion 6 so as to intersect the surface of the holding portion 3 of the contact terminal 1, introduced from the V-shaped portion 6A, and passed through the narrow portion 7 to form the core wire 1.
2 into the rounded portion 6B of the groove 6. Thereafter, the holding portion 3 is appropriately plastically deformed by a tool so as to narrow the groove portion 6, and the core wire 12 is held. with this,
The core wire 12 is firmly temporarily fixed to the contact terminal 1, and does not come off even if an external force is applied. Then, the tip end of the core wire 12 is brought into close contact with the connection surface 5, and soldering is performed here.

The electrical connector 20 in which the contact terminal 1 in which the core wire of the cable is soldered as described above is incorporated is shown in FIG.
As described above, the outer conductor 21 and the dielectric 22 as an insulator are included.

The outer conductor 21 has a tubular portion 23 having a slit 21A extending in the axial direction at a portion in the circumferential direction, and an axial line at a portion in the circumferential direction from the rear portion (the upper portion in the drawing) of the tubular portion 23. 2 extending in the rear direction (upward in the figure)
Four. The arm portion 24 is provided with a pair of clamping pieces 25 which are crimped so as to clamp the cable while holding the cable 10. The sandwiching piece 25 itself is not directly related to the present invention and will not be described in detail.

The dielectric 22 has a substantially cylindrical shape, and the contact portion receiving portion 26 housed in the cylindrical portion 23 of the outer conductor 21 and the rear portion of the contact portion receiving portion 26 in the circumferential direction from the contact portion receiving portion 26. And a lid portion 27 extending in a shape. The dielectric 22 has an insertion hole 26A for receiving the contact portion 4 of the contact terminal 1.
Is formed on the rear surface of the contact receiving portion 26,
It has a support surface 28 that supports the wire connection portion 2 of the contact terminal 1 on the surface opposite to the wire connection surface 5. The supporting surface 28 is formed so as to spread around the contact receiving portion 26. Further, the lid portion 27 of the dielectric 22 is the arm portion 2 of the outer conductor 21.
4 extends close to and in parallel to the position 4 before the holding piece 25 of the arm portion 24. The lid portion 27 has such a thickness that it can be bent without breaking at its base portion. The inner surface of the lid 27 has the contact terminals 1 when the lid 27 is bent.
An abutment surface 29 that abuts the top of the protrusion 8 is formed.

The above-described cable 10 brings the contact terminal 1 to which the cable is soldered as shown in FIG. That is, in a state before the arm portion 24 of the outer conductor 21 of the coaxial connector 20 and the lid portion 27 of the dielectric 22 are bent, the contact portion 4 of the contact terminal 1 is inserted into the insertion hole of the dielectric 22 as shown in FIG. 26A from above. In this state, the lower surface of the wire connection portion 2 of the contact terminal 1 comes into contact with or close to the support surface 28 of the dielectric 22.

Thereafter, the arm portion 24 of the outer conductor 21 is formed.
Is bent in the direction of arrow P. Due to the bending of the arm portion 24, the lid portion 27 of the dielectric 22 is also bent. Thus, the arm portion 24 is plastically deformed from its base portion into an L shape, and the holding piece 25 is caulked to the cable 1 and is held integrally as shown in FIG. The contact surface 29 formed on the inner surface of the lid portion 27 of the bent dielectric member 22 presses the top portion of the protrusion 8 to firmly hold the contact terminal 1 with the support surface 28, as shown in FIG. To do. At that time, in the lateral direction in FIG.
Since 8 is supported on both sides of the top of the protrusion 8, it is extremely reliable. The protruding portion 8 of the contact terminal is higher than the holding portion 3 and is not pressed by the lid portion 27.

Thus, since the contact terminal 1 is firmly held, the contact portion 4 does not tilt even when the mating connector is inserted or removed or the cable 10 receives an external force, and the core wire 12 of the cable is connected. It does not come off from part 2.

In the present invention, the contact terminal is shown and described as a suitable form for the coaxial connector, but the present invention is not limited to this, and can be applied to a normal electric connector.

[0029]

As described above, according to the first aspect of the present invention, a groove portion is provided in a flat plate-shaped holding portion of a contact terminal, and the holding portion is plastically deformed after a core wire of a cable is inserted in the groove portion. Since the core wire is sandwiched between them and solder connection is performed after that, the core wire does not come off from the connection portion during or after the solder connection.

Further, in the second aspect of the present invention, a protrusion is provided on the connection portion of the contact terminal, and both sides of the protrusion on the surface opposite to the protrusion and the connection portion are formed by an insulator. Since the contact terminal is clamped and supported at the position, the contact portion is stable and reliable, neither tilted nor displaced due to the prying insertion / extraction of the mating connector or the external force applied to the cable. The connector can be connected.

[Brief description of drawings]

FIG. 1 is a plan view of a contact terminal used in a coaxial connector as an example of the electrical connector of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view of the coaxial connector of the present invention in a partially assembled state.

FIG. 5 is a cross-sectional view of the connector of FIG. 4 when the assembly is completed.

FIG. 6 is a perspective view showing a main part of a conventional contact terminal.

FIG. 7 is a perspective view showing a main part of another conventional contact terminal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Contact terminal 2 Connection part 3 Holding part 4 Contact part 5 Connection surface 6 Groove part 6A V-shaped part 6B Round shape part 7 Narrow part 8 Projection part 10 Cable 12 Core wire 21 Outer conductor 22 Insulator (dielectric) 26A Insert hole 27 Lid 28 Support surface

Claims (3)

[Claims] 1. A contact portion, which is formed by stamping and bending a metal plate and is implanted in an insulator of a connector and which contacts a contact terminal of a mating connector, and a connection surface for soldering a core wire of a cable. An electrical connector having a contact terminal having a wire connecting portion, the contact terminal having a holding portion for holding and temporarily fixing a core wire at a position adjacent to the wire connecting portion on a side opposite to the contact portion, and the wire holding surface having a wire connecting surface. Is formed into a flat plate shape bent at an inclination angle with respect to the end portion, and the groove portion has a narrow portion that narrows the groove width at least at a part of the edge portion, and the core wire forms the narrow portion. An electrical connector, wherein the holding portion is plastically deformed by external force so as to narrow the groove width of the groove portion after being accommodated in the inner portion of the groove portion, and the core wire can be clamped. 2. The groove portion has a substantially V shape on the open side and a substantially round shape on the back side, and a narrow portion is formed at a transition portion from the substantially V shape portion to the substantially round shape portion. The electrical connector according to claim 1. 3. The contact terminal has a contact portion so as to extend in the direction perpendicular to the connection surface to the side opposite to the connection side, and the insulator is made of a dielectric material held inside the tubular portion of the outer conductor. , The dielectric is formed with an insertion hole that penetrates from the back to the front surface for receiving the contact portion, and two support surfaces that support the wire connecting portion on the side opposite to the wire connecting surface. There is a protrusion projecting to the connection surface side between the support surfaces of the locations, the dielectric has a lid extending from the back surface and bendable from the extending base, and the lid contacts the protrusion when bending. The electrical connector according to claim 1, wherein an abutting surface that comes into contact with the outer conductor is formed, and the bent shape of the lid is maintained by plastically deforming a part of the outer conductor.