| 摘要 |
The invention relates to an electronic device for protecting a handbag by acoustic warning when somebody is trying to cut the handbag or the belt, to unzip or to unfasten the flaps According to the invention, the device comprises an input stage (1) which produces an electric impulse which is fed to a timer and electronic switch stage (2) which generates an electric current fed to the next stage (3) which produces the zero voltage which starts up an audiofrequency oscillator stage (4) and further an audiofrequency amplifier final stage with piezoceramic loudspeaker (5) A timer (R5, R6, D2, C2) and a visual warning device (LED) act only on receiving the electric impulse fed from a sensor (NI2), the impulse being generated when the zip or the flaps are unfastened The delay ensured by the timer until the acoustic warning is triggered, is of seven seconds allowing a shut-down sensor (O) to be actuated from inside the handbag, in order to prevent the triggering of the acoustic warning and to switch off the visual warning device (LED) It also disables the alarm triggered on cutting the handbag When a starting sensor (P) is touched, the visual warning device (LED) is switched on and the alarm is triggered and is heard only seven seconds later If during this time the zip or the flaps are fastened, the alarm triggering is stopped and the electronic device is switched back "in-waiting"
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