Patent ID: 8957339
Filing Date: 2015-02-17
Classification: H01H

Abstract:
1. A dome-shaped spring adapted to be placed on a substrate having a first stationary contact, the dome-shaped spring comprising a circumferential edge which is continuously in contact with the first stationary contact when the dome-shaped spring is placed on the substrate, wherein: at least a part of a neutral plane of the dome-shaped spring has a shape defined by an even function of at least eighth-order, and an angle α of the neutral plane to the substrate at a second inflection point existing at a second-positioned inflection point from the circumferential edge to a center of the spring, an angle β of the neutral plane to the substrate at a first inflection point existing at a first-positioned inflection point from the circumferential edge to the center of the spring, and an angle γ of the neutral plane to the substrate at the circumferential edge satisfy the following inequalities: α≦β and β≧γ.