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1. (WO2018218748) AUTO-DARKENING WELDING FILTER AND AUTO DARKENING WELDING HELMET

Pub. No.:    WO/2018/218748    International Application No.:    PCT/CN2017/092794
Publication Date: Fri Dec 07 00:59:59 CET 2018 International Filing Date: Fri Jul 14 01:59:59 CEST 2017
IPC: A61F 9/06
Applicants: WUHAN WELHEL PHOTOELECTRIC CO. LTD
武汉威和光电股份有限公司
Inventors: HUANG, Shangyou
黄上游
Title: AUTO-DARKENING WELDING FILTER AND AUTO DARKENING WELDING HELMET
Abstract:
An auto-darkening welding filter (1), comprising a filter frame (11), a liquid crystal piece (13), a photoelectric sensor (15) and a drive circuit (17) driving the liquid crystal piece (13); both the liquid crystal piece (13) and the photoelectric sensor (15) are provided on the filter frame (11); the photoelectric sensor (15) is provided on one side, close to the eyes, of the liquid crystal piece (13); the photoelectric sensor (15) acquires optical signals transmitted by means of the liquid crystal piece (13) and feeds same back to the drive circuit (17); the drive circuit (17) controls the light transmittance of the liquid crystal piece (13) according to the signals fed back from the photoelectric sensor (15), thereby forming a closed-loop control system, such that the illuminance of light passing through the auto-changing shade auto-darkening welding filter (1) is constant. The auto-darkening welding filter (1) constantly performs feedback regulation by means of the closed-loop control system, thereby preventing the situation in which the darkening welding filter becomes too dark or too bright.