Patent ID: 7994445
Filing Date: 2011-08-09
Classification: H01H

Abstract:
1. A sheet switch module, comprising: a circuit board; a structure wherein a central contact is disposed on the circuit board, a circumferential contact is disposed circumferentially of the central contact on the circuit board and a spring is disposed on the circumferential contact over the central contact; a light guiding sheet formed by a transparent or light-transmitting resinous film, covering and closely fitting with an upper surface of the spring; and a light source that emits light into the light guiding sheet, wherein the spring forms a switching circuit and the spring provides electrical conduction between the central contact and the circumferential contact when the light guiding sheet is pressed, wherein a plurality of the structures are provided, the light source is disposed close to an end portion of the light guiding sheet, wherein the light guiding sheet covering the springs of the structures is configured such that a thickness of the light guiding sheet gradually reduces from a peripheral edge portion of each of the springs to a corresponding central portion of each of the springs and the light guiding sheet is configured to guide light emitted from the light source along an upper surface above each of the springs, and wherein a gap formed between the light source and the light guiding sheet is filled with a transparent resin.