公开(公告)号：US5530432A

公开(公告)日：1996-06-25

申请号：US383305

申请日：1995-02-03

Applicant: Mark P. C. Chen

Inventor： Mark P. C. Chen

IPC: A44C15/00 ,  G01J1/04 ,  G01J1/18 ,  G01J1/42 ,  G08B17/12

CPC classification number: G01J1/18 ,  A44C15/0015 ,  G01J1/04 ,  G01J1/42 ,  G01J1/0271

Abstract: A photo monitoring apparatus including a photoresistor, a series of shunt resistors, and a comparator IC, wherein the comparator IC provides an output signal to a LED and a diaphragm speaker, when the voltage from the shunt resistors drops below a pre-set reference voltage, causing the LED to give light and the diaphragm speaker to produce a warning sound. The shell of the photo monitoring apparatus is installed with a digital time display controlled by a time circuit to indicate time.

Abstract translation: 一种包括光敏电阻器，一系列分流电阻器和比较器IC的照片监控设备，其中当来自分流电阻器的电压下降到预设的参考电压以下时，比较器IC向LED和隔膜扬声器提供输出信号 ，使LED发光并使隔膜扬声器产生警告声。 照相监视装置的外壳安装有由时间电路控制的数字时间显示，以指示时间。