WATER PROOF SWITCH ASSEMBLY
Original Publication Date: 1994-Jun-01
Included in the Prior Art Database: 2002-Mar-07
A very common problem encountered with port- able communication devices is waterproofing of the switches. This problem can easily be eliminated by to the decoder PCB. By totally thinning the plastic wall in the highlighted synch area, some increased attaching a strain gage (Sl), to the plastic housing, deflection will be generated assuming a constant nor- mal force. This deflection will be monitored by the in place of the mechanical or elastomeric switch. strain gage in the form ~of a change in resistance. The strain gauge can be molded into the plastic hous- The analog to digital converter (A/D) will then ing or simply bonded inside the plastic wall. Via change a value from zero to one at a certain preset wires, sockets or such other interconnect devices, resistance trigger point. The Micro-P in turn will the strain gage can then be electrically connected then activate the switching line.