Method for forming electrical contacts on an electrical connector

Abstract

A method for forming electrical contacts on an electrical connector having terminals therein includes the steps of preparing a screening board on top of the electrical connector to allow each mesh to align with a center of a top face of each of the terminals of the electrical connector, the screening board having meshes defined therein. Tin paste is applied onto the screening board to allow the tin paste to fill in each of the meshes. Excessive tin paste is removed from the screen board. Then the screening board is removed to leave tin blocks on the centers of the top faces of the terminals of the electrical connector. A heating step is processed to heat the electrical connector. Then electrical contacts are formed on the top faces of the terminals of the electrical connector.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a flow chart of the method of the present invention;

FIG. 2 is a schematic view showing that the tin paste is applied onto the screening board;

FIG. 3 is a schematic view showing that excessive tin paste is removed from the screening board by a scraper;

FIG. 4 is a schematic view showing that the screening board is being removed;

FIG. 5 is a schematic view showing that electrical contacts are formed on top of the electrical connector;

FIG. 6 is a perspective view showing a conventional electrical connector;

FIG. 7 is a schematic cross sectional view showing the internal structure of the conventional electrical connector in FIG. 6;

FIG. 8 is a perspective view showing a different electrical connector; and

FIG. 9 is a partially perspective view showing details of the electrical connector in FIG. 8.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

With reference to FIGS. 1 and 2, it is noted that the electrical contact forming method in accordance with the present invention includes the steps of:

preparing a screening board (20) having meshes (21) defined therein and each mesh being conical, the screening board (20) being placed on top of an electrical connector (10) to allow each mesh (21) to align with a center of a top face (1211) of each of connecting ends (121) of each of terminals (12) respectively received in a through hole (11) defined in the electrical connector (10);

applying tin paste (30) onto the screening board (20) to allow the tin paste (30) to fill in each of the meshes (21), as shown in FIG. 2;

removing excessive tin paste (30) from the screening board (20), as shown in FIG. 3;

After the excessive tin paste (30) is removed from the screening board (20) via such as a scraper (40), it is noted that a tin blocks (31) is filled in each and everyone of the meshes (21). Because of the conical configuration of the meshes (21), the tin blocks (31) on top of the electrical connector (10) are also conical.

removing the screening board (20) to leave tin blocks (31) on the center of the top faces (1211) of the terminals (12) of the electrical connector (10);

Again, due to the conical configuration of the meshes (21), removal of the screening board (20), as shown in FIG. 4, is easy.

heating a base of the electrical connector (10);

Via far-infrared heating or any appropriate heating methods known in the art, the tin blocks (31) are heated first and then the tin blocks (31) have a spherical appearance due to internal converging force in process of cooling.

forming electrical contacts (32) on the top faces (1211) of the terminals (12) of the electrical connector (10).

From the aforementioned description, it is noted that when the screening board (20) is placed on top of the electrical connector (10), each mesh (21) of the screening board (20) is aligned with the center of the top face (1211) of the terminals (12) so that when the tin blocks (31) are formed on the electrical connector (10), the electrical contacts (32) are perfectly located on the centers of the top faces (1211) of the terminals (12) of the electrical connector (10).

It is to be understood, however, that even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.

Claims

1. A method for forming electrical contacts on an electrical connector having terminals, the method comprising the steps of: preparing a screening board on top of the electrical connector to allow each mesh to align with a center of a top face of each of the terminals of the electrical connector, the screening board having meshes defined therein;applying tin paste onto the screening board to allow the tin paste to fill in each of the meshes;removing excessive tin paste from the screening board;removing the screeni board to leave tin blocks on the centers of the top faces of the terminals of the electrical connector;heating the electrical connector; andforming electrical contacts on the top faces of the terminals of the electrical connector.

2. The method as claimed in claim 1, wherein the meshes are conical.

3. The method as claimed in claim 1, wherein the excessive tin paste is removed via a scraper.

4. The method as claimed in claim 2, wherein the excessive tin paste is removed via a scraper.

5. The method as claimed in claim 4, wherein the tin blocks are conical.

6. The method as claimed in claim 4, wherein a far-infrared heating is selected to proceed the heating step.

7. The method as claimed in claim 5, wherein a far-infrared heating is selected to proceed the heating step.

8. The method as claimed in claim 6, wherein the electrical contacts are spherical.

9. The method as claimed in claim 7, wherein the electrical contacts are spherical.