Elastic contacts for keys

Abstract

The invention discloses an elastic contact sheet for buttons, which includes a supporting ring, a pressing part and a plurality of elastic arch arms, the pressing part is arranged above the supporting ring, and the elastic arch arms bend in the same direction along the pressing part and extend to the support On the circular ring, a hollow part for unloading load is formed between adjacent elastic arch arms, and the area of ​​the hollow part changes from large to small along the bending direction of the elastic arch arms. In this way, by setting the elastic arch arm between the pressing part and the support ring, a hollow part for unloading the load is formed, so that the compressive stress transmitted by the pressing part can be dispersed and released through the rotation of the elastic arch arm, thereby improving the working process of the elastic contact piece. The stress release ability in the middle increases the rebound strength of the elastic contact piece and prolongs the service life. In addition, the elastic contact piece feels light, the height of the contact piece is moderate, and the pressing stroke is long. Larger pressing force can't even press hard problems.

Description

technical field [0001] The invention relates to the technology in the field of electronics, in particular to an elastic contact piece for a button. Background technique [0002] In recent years, with the rapid development of electronic technology, digital electronic products such as digital cameras, mobile phones, and MP4 are gradually becoming miniaturized. Therefore, the requirements for keys used to facilitate the input of these electronic products are also continuously increasing. Traditional keys There is an elastic contact piece below which is used for button reset. This elastic contact piece is generally dish-shaped and is a whole without any gaps. figure 1 , 2 As shown, after the elastic contact piece is pressed down, the top is concave to connect the circuit. Since the force points of this type of elastic contact piece are concentrated on the edge of the contact piece, after pressing a certain number of times, the edge of the contact piece will be fatigued and brok...

AI Technical Summary

Problems solved by technology

[0002] In recent years, with the rapid development of electronic technology, digital electronic products such as digital cameras, mobile phones, and MP4 are gradually becoming miniaturized. Therefore, the requirements for keys used to facilitate the input of these electronic products are also continuously increasing. Traditional keys There is an elastic contact piece below which is used for button reset. This elastic contact piece is generally dish-shaped and is a whole without any gaps. figure 1 , 2 As shown, after the elastic contact piece is pressed down, the top is concave to connect the circuit. Since the stress points of this type of elastic contact piece are concentrated on the edge of the contact piece, after pressing a certain number of times, the edge of the contact piece will be fatigued and broken, resulting in Key failure, in order to solve the fatigue fracture problem caused by the stress concentration of the contact piece, the industry has opened holes for dispersing stress on the contact piece, such as image 3 , 4 As shown, the other is that the support bar 50 between the holes is linear, such as Figure 5 , 6 As shown, when the elastic contact piece is under pressure, the stress on the support bar 50 is still concentrated at point A, which cannot be dispersed, and is prone to fatigue fracture. In addition, the above-mentioned integral type or contact piece with holes cannot increase the height of the contact piece as required, because Once the height of this type of contact piece is increased, the pressure required to press the contact piece will increase, and it may even be impossible to press down.

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