JPH07296896A - Electric connector - Google Patents

Abstract

PURPOSE:To provide an electric connector which prevents generation of looseness caused by dimension dispersion, error or the like between opposing faces of a shield case and a rear cover in manufacturing fusion thereof. CONSTITUTION:Opposing edge parts 21a, 22a of a first cover 21 and a second cover 22 are connected to each other by means of ultrasonic fusion. A plurality of protrusions 30, 30 are provided in an inner surface of the second cover 22 so that a gap F may be generated between opposing faces of a shield case 16 and the second cover 22 even after fusion-fixing of the first cover 21 to the second cover 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention covers a shield base on the outer periphery of a mold base containing contact pins, and a front cover and a rear cover on the front outer periphery and the rear outer periphery of the shield case, respectively. The present invention relates to an electric connector in which opposed end edges of a front cover and a rear cover are joined together by ultrasonic welding.

[0002]

2. Description of the Related Art A conventional example of this type of electrical connector is shown in FIGS.
6 shows. In the electrical connector 50 of the illustrated example, the outer periphery of a mold base 14 having the contact pins 12 built therein is covered with a first shield case 16 and a second shield case 18 each having an L-shaped cross section, and the outer peripheries of the front portions of the shield cases 16, 18 are covered. A front cover 21 and a rear cover 22 made of synthetic resin are respectively covered on the outer periphery of the front cover and the rear periphery of the rear cover,
1 and the rear cover 22 are opposite to each other at the ultrasonic welding machine 70.
It is welded and joined by ultrasonic vibration according to FIG. 6 (welding and joining portion 20). In the figure, reference numeral 15 is a cable, 19 is a lock piece, and 24 is a clamper.

When manufacturing such an electrical connector 50, the shield case 16 and the rear cover 22 are opposed to each other in advance in a state (FIG. 7) immediately before the welding and joining in which the front cover 21 and the rear cover 22 are in contact with each other. A gap A is formed between the surfaces, and a gap B (A = A) that is the same as the gap A is formed between the facing edge portions 21a and 22a of the front cover 21 and the rear cover 22.
The dimensions of each part are set so that B) is formed.

[0004]

Therefore, if the dimensions of the respective portions are set in advance as described above, when the opposite end edges 21a, 22a of the front cover 21 and the rear cover 22 are welded and joined, the respective portions are welded. Dimensional error and welding error (excessive or insufficient welding)
As long as there is no such difference, the clearance B should be 0 and the clearance A should also be 0, and the rear cover 22 should be in close contact with the shield case 16.

However, in order to prevent the dimensional error and the welding error from occurring as described above, extremely precise processing control is required, which is impossible from the viewpoint of manufacturing cost, etc. Usually, a gap is formed between the opposing surfaces of the shield case 16 and the rear cover 22 due to an error or the like. If a gap is formed between the opposing surfaces of the shield case 16 and the rear cover 22 in this way, rattling easily occurs in them, and the obtained product becomes a defective product.

In view of the above point, the present invention provides an electrical connector that is less likely to cause rattling between the opposing surfaces of the shield case and the rear cover due to dimensional variation, error, and the like during manufacturing and welding of them. The purpose is to do.

[0007]

In order to achieve the above-mentioned object, an electric connector according to the present invention has a shield case on the outer periphery of a mold base containing contact pins, and a first cover covers the outer periphery of the shield case. And a second cover, and the opposite end edges of the first cover and the second cover are joined together by ultrasonic welding. The shield case even after the welding and joining of the first cover and the second cover And a plurality of protrusions are provided on the inner surface of the second cover so as to form a gap between the surfaces facing each other and the second cover.

[0008]

In the electrical connector according to the present invention having the above-mentioned structure, the inner surface of the second cover is provided with a plurality of protrusions in advance. In this case, the height of the protrusion is set so as to form a gap between the facing surfaces of the shield case and the second cover even after the welding and joining of the first cover and the second cover. Specifically, the shield case 16 and the second cover (rear cover) 22 shown in FIG.
The gap A between the facing surfaces of the first cover (front cover) 21 and the second cover (rear cover) 22 is the facing end edge portions 21a, 22.
It is set to be larger than the gap B between a.

With this configuration, when the opposite end edges of the first cover and the second cover are weld-bonded by the ultrasonic welding machine,
The tip of the protrusion is melted while being pushed by the shield case, and its height can be lowered. However, even when the welding of the opposite end edges of the first cover and the second cover is completed, some height is not reached. Therefore, a gap is always formed between the opposing surfaces of the shield case and the second cover when the welding and joining is completed.

In this case, there is no problem even if the size of the gap formed between the opposing surfaces of the shield case and the second cover varies among products, whereby the shield case and the second cover can be manufactured and welded. Variations in size, errors and the like are absorbed, rattling due to these is less likely to occur, and manufacturing defects are reduced.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an electrical connector 1 according to the present invention.
0 shows the state of the cover 0 immediately before the welding and the state after the welding. 4 to 7 described above in these figures.
The parts corresponding to the respective parts of the conventional electric connector 50 shown in FIG.
The differences will be emphasized below.

In the electrical connector 10 of this example, a front cover (first cover) 21 and a rear cover (second cover) 22 are provided.
A plurality of protrusions 30, 30 are provided on the inner surface of the rear cover 22 at predetermined intervals so as to form a gap between the facing surfaces of the shield case 16 and the rear cover 22 even after welding and welding.

In this case, as shown in FIG. 2, the heights of the respective projections 30, 30 are such that the shield case 16 and the rear cover 22 face each other even after the front cover 21 and the rear cover 22 are welded and joined together. The dimensions are set so as to create a gap F between (rear surfaces). Specifically, as shown in FIG. 1 showing the state immediately before the welding and joining, a gap C formed between the opposing surfaces of the shield case 16 and the rear cover 22 is a facing edge portion of the front cover 21 and the rear cover 22. It is set to be larger than the gap D formed between 21a and 22a (C> D).

With this arrangement, when the opposite end edges 21a, 22a of the front cover 21 and the rear cover 22 are weld-bonded by the ultrasonic welding machine, the protrusions shown in FIG. 3 (a) to FIG. 3 (b) are formed. The tip portions of 30, 30 are melted while being pushed by the shield case 16 and the height thereof can be lowered, but the opposite end edge portions 21 a of the front cover 21 and the rear cover 22 are
Some height (= gap F) remains even after the welding and welding of 22a is completed. Therefore, the gap F must be formed between the facing surfaces of the shield case and the second cover when the welding and welding is completed. become.

In this case, there is no problem even if the size of the gap F formed between the facing surfaces of the shield case 16 and the rear cover 22 varies among products, and accordingly, there is no problem. Variations in size and errors during manufacturing and welding are absorbed, rattling due to these is less likely to occur, and manufacturing defects are reduced.

[0016]

As can be understood from the above description, in the electrical connector according to the present invention, when the opposite end edge portions of the first cover and the second cover are welded and joined, the protrusions provided on the second cover Although the tip is pressed by the shield case and melted, the height can be lowered, but some height remains even after the welding joining of the opposite end edges of the first cover and the second cover is completed. Therefore, a gap is always formed between the opposing surfaces of the shield case and the second cover when the welding and joining is completed. In this case, there is no problem even if the size of the gap formed between the opposing surfaces of the shield case and the second cover varies among the products, which allows the shield case and the second cover to be manufactured and welded at the time of welding. Variations in dimensions, errors, etc. are absorbed, rattling due to these is less likely to occur, and manufacturing defects are reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state immediately before welding and joining of an electric connector according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state after welding and joining the electric connector shown in FIG.

3 (a) and 3 (b) are explanatory views for explaining a welding and joining process of a cover of the electric connector of FIG.

FIG. 4 is a vertical cross-sectional view showing an example of a conventional electric connector.

5 is a bottom view of the electrical connector of FIG.

6 is a side view of the electrical connector of FIG.

7 is a vertical cross-sectional view showing a state of the cover of the electric connector of FIG. 4 immediately before welding and joining.

[Explanation of symbols]

 10 Electrical Connector 16 Shield Case 21 Front Covers 21a, 22a Opposing End Edges 22 Rear Cover 30 Protrusion F Gap

Claims (1)

[Claims] 1. A shield case is arranged on the outer periphery of a mold base containing a contact pin, the outer periphery of the shield case is covered with a first cover and a second cover, and opposite edges of the first cover and the second cover. In an electrical connector in which parts are joined by ultrasonic welding, a gap is created between facing surfaces of the shield case and the second cover even after the first cover and the second cover are joined by welding. An electric connector, wherein a plurality of protrusions are provided on an inner surface of the second cover.