US 11,719,961 B1
Method of controlling shade of light valve for auto darkening filter
Weiren Gao, Changzhou (CN)
Assigned to CHANGZHOU SHINE SCIENCE & TECHNOLOGY CO. LTD., Jiangsu (CN)
Filed by CHANGZHOU SHINE SCIENCE & TECHNOLOGY CO. LTD., Changzhou (CN)
Filed on Nov. 11, 2022, as Appl. No. 17/985,772.
Application 17/985,772 is a continuation of application No. PCT/CN2022/111086, filed on Aug. 9, 2022.
Claims priority of application No. 202210244969.8 (CN), filed on Mar. 14, 2022.
Int. Cl. G02C 7/10 (2006.01); A61F 9/06 (2006.01); G02C 7/08 (2006.01)
CPC G02C 7/101 (2013.01) [A61F 9/065 (2013.01); A61F 9/067 (2013.01); G02C 7/083 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method of controlling a shade of a light valve for an auto darkening filter, comprising the following steps:
controlling a current shade of the light valve at a first shade, continuously detecting a welding arc signal until being detected; perform a next step;
controlling a first shade of the light valve to change to a target shade, wherein applying a high voltage signal to the light valve and maintaining for a time period T0, whereby the light valve obtains a second shade;
controlling the light valve to transition from the second shade to the target shade within a time period T1, wherein at least one intermediate shade is passed during the transition; and wherein the target shade is between the first shade and the second shade, and the target shade is smaller than the highest shade of the light valve, wherein the intermediate shade includes at least the highest shade of the light valve, wherein the highest shade is maintained for a time period T11, the light valve transitions from the highest shade to the target shade in a time period T12, and the shade change process is a linear change process;
wherein T12=T1−T11
wherein T12>T11
and maintaining the target shade for welding work until the welding arc signal is interrupted; and
controlling the light valve to transition from the target shade to the first shade within a time period T2, wherein at least one intermediate shade is passed during the transition;
wherein the first shade is smaller than the target shade.