公开(公告)号：US07106008B2

公开(公告)日：2006-09-12

申请号：US10930996

申请日：2004-08-31

Applicant: Yu-Shan Chu ,  Ming-Nan Chuang

Inventor： Yu-Shan Chu ,  Ming-Nan Chuang

IPC: H05B41/14

CPC classification number: H05B41/325 ,  G03B7/16 ,  G03B15/05 ,  G03B2215/0503 ,  H04N5/2354

Abstract: A flashlight control circuit is provided to control the flash according to an exposure voltage and a predetermined voltage. Either a first comparator, second comparator and logic gate or a comparator, a first inverter, a first transistor, a first logic gate and a second logic gate may be included in the control circuit. The provided circuit enables the capacitor to discharge promptly when the trigger signal stops. Therefore, an additional control signal for discharge is not necessary. Furthermore, the circuit has a clamping circuit to clamp the exposure voltage at a lower level than the predetermined voltage according to a full flash signal.

Abstract translation: 提供手电筒控制电路以根据曝光电压和预定电压来控制闪光。 控制电路中可以包括第一比较器，第二比较器和逻辑门或比较器，第一反相器，第一晶体管，第一逻辑门和第二逻辑门。 当触发信号停止时，所提供的电路使电容器能够及时放电。 因此，不需要用于放电的附加控制信号。 此外，电路具有钳位电路，以根据全闪光信号将曝光电压钳位在比预定电压低的水平。