Wireless switch for control of a luminous point, uses excited piezo-electric element to hold transmitter voltage at given level in order that its signal is completely transmitted

摘要

Application of force of about 3 Newton's over distance of about 3 milli-meters is sufficient to cause an action (15) on moving part of trigger (16). The rectifier circuit includes rectifier (26) formed by 4 diodes in Gratz bridge for double alternating rectification, and capacitor (31). The rectifier input terminals (24,25) are connected to piezo electric element (18). The transmitter (14) and the capacitor are connected in parallel at rectifier circuits output terminals (27,28). Wireless device fitted with, moving part (16) of a trigger, transmitter circuit (14) of signal (13) in response to an action (15) exerted on the moving part (16). The device also includes: (a) a piezo-electric element (18); a current rectifier circuit (26,31) at the terminals (22,23) of the piezo-electric element and supply terminals (32,33) of the transmitter circuit, and; a system (19,20) which transforms the action (15) into an mechanical oscillatory excitation (17) which is exerted on the piezo-electric part. The excitation (17) is designed to produce at the piezo-electric terminals (22,23) an alternating voltage, such that the voltage, rectified and smoothed by the rectifier circuit appearing as a consequence at the supply terminals of the transmitter, remains greater than a predetermined level during a time period greater than a predetermined time so that the transmitter circuit can completely transmit the signal (13).