Patent ID: 6881939

Claim:
An auto darkening eye protection device comprising: a shutter assembly adjustable between a clear state and a dark state; and a control circuit comprising: a microcontroller; a delivery circuit simultaneously receiving a dark state signal and a clear state signal and outputting a dark state drive signal to the shutter assembly to switch the shutter assembly from the clear state to the dark state upon enablement of the delivery circuit; a sensing circuit for sensing the occurrence of a welding arc and providing an output indicative of the occurrence of the welding arc; a weld detect circuit receiving the output of the sensing circuit, the weld detect circuit enabling a dark state drive signal to be delivered to the shutter assembly by the delivery circuit; and a dark/light control receiving input from at least one of the weld detect circuit and the microcontroller and outputting signals to the delivery circuit in response thereto, the signals provided to the delivery circuit controlling passage of the dark state signal and the clear state signal to the shutter assembly.