| 摘要 |
The door scope identifies visitors off a gateway by using polymer dispersed liquid crystal(PLDC) passing or blocking lights. The door scope comprises: the PLDC module(13), formed by pouring a liquid crystal mixture between transparent electrodes and laying the safety glasses, making an inner man see via an identification opening(14a); a 1st switch(16) controlling the passage of the light by switching on/off electric power; a 2nd switch(2) operated by the visitors; a buzzer(8), driven by the 2nd switch, generating a buzzing sound.
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