Electrostatic discharge protection in a portable...

H - Electricity – 01 – H

Patent

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Details

H01H 13/70 (2006.01) H01H 13/702 (2006.01) H04M 1/02 (2006.01) H04M 1/23 (2006.01) H05F 3/00 (2006.01)

Patent

CA 2282446

A portable communication device (10) has an electronic circuit board (20) arranged inside a housing (12), and a keypad (30), the individual keys (32) of which are arranged, when depressed, to collapse a respective tactile dome (52) on a domefoil (50) interposed between the keypad and the circuit board, so as to establish electric contact with a respective contact point (22) on the circuit board. The communication device has means for protecting the circuit board from electrostatic discharge (ESD). The domefoil (50) is formed as a non- conductive sheet providing an air-tight and/or electrostatic seal between the keypad (30) and the circuit board (20), whereby the domefoil functions as said ESD-protective means.

Un dispositif de télécommunication portable (10) comprend une carte à circuit imprimé electronique (20) agencé dans un boîtier (12), ainsi qu'un bloc (32) de touches, dont les touches individuelles (32) sont agencées, lorsqu'elles sont pressées, afin d'infléchir un dôme tactile respectif (52) sur une feuille (50) à dômes interposée entre le bloc de touche et la carte à circuit, de manière à établir un contact électrique avec un point de contact respectif (22) sur la carte à circuit. Le dispositif de télécommunication comprend des moyens de protection de la carte à circuit contre les décharges électrostatiques (DES). La feuille (50) à dômes se compose d'une plaque non conductrice formant un joint étanche à l'air et/ou électrostatique entre le bloc (32) de touches et la carte à circuit (20) de manière que la feuille à dômes fasse office de moyen protecteur contre les décharges électrostatiques.

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