Welding filter
Arc light
Sensor
Magnify
Controlling
circuit
LCD driver
circuit
eye
circuit of power supply
2
1. GENERAL
The light valve(LCD) in this product can turn from light to dark at the moment of electricity arc
appearing,with the principle of photoelectric.The darkness degree can be adjusted between DIN 9
and 13.UV-IR filtering assembly consists of reflective coated glass,multi-layer light valve(LCD)and
polarizer.It can effectively
block the ultraviolet radiation and infrared ray from get through ,then effectively protect the eyes of
the workers against the dama-ges of ultraviolet radiation and infrared ray.Automatic darkening
helmet has
wider coverage than common helmet.It can be used to protect the face and neck against the dama-
ges of the electricity arc and improve the product quality and working efficiency.This product is
widely used
by many developed countries at present.
This product is widely used in shipbuilding,petroleum, Architecture,steel,boiler-manufacture and so
on .The working temperature range is -5 c~+55 c.The limited working temperature range is -10
c~+60 c.The limited storage temperature range is -20 c ~+70 c.The relative humidity range is
20%~80%.
2. WORKING PRINCIPLE
The helmet can converse the electricity arc resulted from welding to the electronic signals.And after
these signals are magnified,they will be passed to the LCD driven circuit,in which the light valve will
be turned from light to dark.So that can avoid the damages to the eyes of the workers.
The principle of the whole circuit is as follows:
