Patent ID: 8953104
Filing Date: 2015-02-10
Classification: A61F,G02F

Abstract:
1. An auto-darkening welding lens, comprising a window and a frame, the window comprising a filter and a liquid crystal plate that are stacked in an order, wherein: the auto-darkening welding lens has a lighting device, the lighting device comprising a luminous element, a switch and a power supply that are electrically connected to form a loop, the luminous element being arranged on a face of the frame that is towards a welding object; the switch is a time-delay switch; the time-delay switch comprises a button, a capacitor for charging and discharging, a discharge resistor, a gate chip and a transistor, the button is connected at a terminal thereof to a power supply terminal and is connected at the other terminal thereof to the capacitor, the capacitor is connected in parallel to the discharge resistor, the gate chip is connected at an input terminal thereof to a voltage output terminal of the capacitor and is connected at an output terminal thereof to a base of the transistor, the transistor is connected at an emitter thereof to the ground, and the luminous element is connected at a cathode thereof to a collector of the transistor and is connected at an anode thereof to the power supply terminal.