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发明名称
信箱显示仪
摘要
一种信箱显示仪,包括设置在信箱箱体上的光电收发电路,开关滤波电路,电信号开关电路以及指示电路。由于用户能在居室随时监视信箱内有无信件或报刊投入,故节省了用户来回开启信箱的次数,并可避免信件的丢失。
申请公布号
CN2267490Y
申请公布日期
1997.11.12
申请号
CN96229503.5
申请日期
1996.03.22
申请人
华柏炯
发明人
华柏炯
分类号
G08B7/06
主分类号
G08B7/06
代理机构
代理人
主权项
1.一种信箱指示仪,其特征在于包括:光电信号收发电路,它包括设置在信箱箱体上用以向信箱内部发出可见光的发光源,以及用以接收自信箱内部反射的所述可见光的光电元件; 开关滤波电路,它包括开关以及经由所述开关可关断地连接到一电源的滤波电容;电信号开关电路,它包括连接到所述光电元件的晶体管电路;以及指示电路,它包括连接到所述晶体管电路输出端的振荡器,以及连接到该振荡输出端的显示器和/声响器。
地址
上海市控江路2100号306室
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