Flat earth terminal and method of surface-mounting same

Abstract

A flat earth terminal in the shape of a flat plate comprising a main part with a screw insertion hole and a leg-like terminal part continuously extending from an end of the main part, wherein a recess is formed on a mounting side of the flat earth terminal intended to be located on a printed circuit board, in a proximal portion of the terminal part continuously extending from the main part, to separate a distal portion of the terminal part from the main part. By this, solder is prevented from flowing from the terminal part to the main part, with certainty, so that a stable electric connection between the main part and the printed circuit board is ensured.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:

FIG. 1 is a perspective view showing an example of embodiment of flat earth terminal according to the present invention;

FIG. 2 is a diagram showing a cross-sectional structure of the flat earth terminal shown in FIG. 1;

FIG. 3 is a diagram relating to an embodiment of method of surface-mounting a flat earth terminal according to the present invention, and showing an example of formation of conductive sections, and a solder resist screen-printed with resin ink, on a printed circuit board on which the flat earth terminal of FIG. 1 is to be mounted;

FIG. 4 is a diagram showing how the flat earth terminal is surface-mounted on the printed circuit board;

FIG. 5 is a diagram showing how the printed circuit board with the flat earth terminal surface-mounted on is screwed to a chassis, and

FIG. 6 is a diagram showing another manner of surface-mounting a flat earth terminal onto a printed circuit board.

Claims

1. A flat earth terminal in the shape of a flat plate, comprising: a main part,a screw insertion hole passing through the main part,a leg-like terminal part continuously extending from an end of the main part, anda recess formed on a mounting side of the flat earth terminal intended to be located on a printed circuit board, in a proximal portion of the terminal part continuously extending from the main part, to separate a distal portion of the terminal part from the main part.

2. A flat earth terminal according to claim 1, wherein the recess is formed by performing pressing work on the mounting-side surface of the proximal portion of the terminal part to impart a shape of a groove traversing the proximal portion of the terminal part.

3. A method of surface-mounting a flat earth terminal wherein in advance of surface-mounting a flat earth terminal according to claim 1 onto a printed circuit board, a solder resist is screen-printed on the printed circuit board with a resin ink of low solder wettability, in a region in which the flat earth terminal is to be surface-mounted, at least at a location intended to correspond to the recess formed in the flat earth terminal.

4. A method of surface-mounting a flat earth terminal according to claim 3, wherein the recess is formed by performing pressing work on the mounting-side surface of the proximal portion of the terminal part to impart a shape of a groove traversing the proximal portion of the terminal part.

5. A method of surface-mounting a flat earth terminal according to claim 3, wherein the solder resist is a frame-like pattern adapted to surround the main part of the flat earth terminal, locally separating corners of the main part from the main part and separating the terminal part from the main part.