Shrapnel

Abstract

This invention directs to a striking flake, especially a kind of striking flake which can be pressed to form electric contact point on the circuit plate and conduct current, outside the flake is equipped with a flat floor with a opposing part, using the flat floor to strengthen the stretching resistance around the striking flake and increase its service life; the opposing part is located in the two relative positions on the floor or four relative positions or three equal-pitch positions; the flake has several punch hole, being regular geometric shape or irregular geometric shape; in the center of the striking flake is located with contacting part being upward and downward bulging or notch shape.

Description

technical field [0001] The present invention relates to an elastic sheet, in particular to an elastic sheet that can be pressed to form electrical contacts on a circuit board and conduct electricity. A flat bottom surface with a stop portion is arranged around the outer periphery of the elastic sheet, and the surrounding area of ​​the elastic sheet is strengthened by means of the flat bottom surface. The tensile strength is relatively long, and the service life of the shrapnel is relatively prolonged. Background technique [0002] see figure 1 , the key 1 used by electronic devices such as mobile phones to input signals is actually a set of key switches. The negative contact 4 on the circuit board 3 used in the mobile phone is fixed and kept in communication, but there is always a certain gap between the top of the metal dome 2 and the opposite positive contact 5, so as long as the button 1 is pressed down, the metal dome 2 The top is deformed downward, so that it touches ...

AI Technical Summary

Problems solved by technology

Due to the shearing and material removal, the structure of the commonly used metal shrapnel 2 is as follows: image 3 As shown, there are still some metal wools 9 that protrude on the peripheral edge of the commonly used metal domes 2, and the retention of the metal wools 9 constitutes a structural defect of the generally used metal dome 2. The metal wool 9 places of the metal shrapnel 2 are easily on the contrary at point A (as Figure 4 As shown) because the angle between tangent line B and tangent line C is greater than 90 degrees and less than 180 degrees, close to 90 degrees, residual stress concentration and fatigue damage are prone to occur, resulting in cracks and breakage of commonly used metal shrapnel 2, thereby reducing the commonly used Service life of metal shrapnel 2

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