Patent ID: 9576451
Date: 2017-02-21
CPC Classifications: G07F,G08B

Claim:
1. An electronic device, comprising: a housing including a cover; a circuit board disposed within the housing and having at least one pair of input contacts and a pair of alarm contacts; a key pad disposed on the cover of the housing and comprising at least one actuation element aligned with the at least one pair of input contacts on the circuit board; an alarm circuit disposed on the circuit board and coupled to the pair of alarm contacts; a security wrap interposed between the circuit board and the key pad and comprising: a flexible substrate; a security screen disposed on the flexible substrate and comprising a pair of screen terminals and an electrically conductive trace extending between the pair of screen terminals; an adhesive layer covering the flexible substrate and bonding the flexible substrate to the circuit board, the adhesive layer being formed between the flexible substrate and the circuit board and including a plurality of openings that each extend from one side of the adhesive layer to another side of the adhesive layer; a pair of conductive structures forming conductive paths extending through the adhesive layer to electrically connect the pair of screen terminals of the security screen to the alarm circuit; and a release layer formed between a portion of the flexible substrate and a corresponding portion of the security screen, the release layer modifying an adhesion between the portion of flexible substrate and the corresponding portion of the security screen to cause partial destruction of the security screen in response to the security wrap being removed from the circuit board; at least one first dome disposed between the flexible substrate of the security wrap and the circuit board and aligned with the at least one actuation element, whereby depressing one of the at least one actuation element causes resilient deformation of one of the at least one first dome to electrically connect a corresponding one pair of the at least one pair of input contacts; a second dome disposed between the flexible substrate of the security wrap and the circuit board and aligned with the pair of alarm contacts; and a spigot formed on the housing, aligned with the second dome and applying pressure on the flexible substrate to press the second dome against the pair of alarm contacts while the housing is closed, wherein the pair of conductive structures, the first dome and the second dome are formed inside respective ones of the plurality of openings of the adhesive layer, and wherein at least one first dome is fixed to the security wrap with an adhesive while a discrete pad of a dielectric material prevents electrical contact between the at least one first dome and the security screen on the security wrap.