EP 1259852 A2 20021127 - ACTIVE ELECTROOPTIC FILTERING DEVICE AND METHOD FOR OPERATING THE SAME
Title (en)
ACTIVE ELECTROOPTIC FILTERING DEVICE AND METHOD FOR OPERATING THE SAME
Title (de)
AKTIVE ELEKTROOPTISCHE FILTEREINRICHTUNG UND VERFAHREN ZU IHREM BETRIEB
Title (fr)
DISPOSITIF DE FILTRAGE ELECTRO-OPTIQUE ACTIF ET PROCEDE POUR FAIRE FONCTIONNER CE DERNIER
Publication
Application
Priority
- CH 0000040 W 20000128
- CH 45899 A 19990311
Abstract (en)
[origin: WO0054097A2] The invention relates to an active optical filtering device which is particularly suitable for use as a glare protection device in welding protection masks, helmets or goggles. The device is equipped with a light protection filter with at least one active optical filtering element, an electronics unit for controlling the active filtering element, a light sensor which co-operates with the electronics unit and a power supply, especially a solar cell, for the electronics unit and the active filtering element; in a manner known per se. The control circuit for the active filtering element is configured in such a way that the load capacitor is entirely unloaded over a short space of time within a frame frequency (1/T) range of 0.01 to 1 Hz, which halves the power consumption in comparison with known circuits. At the same time, the operating voltage (U) is placed within a range which is determined quantitatively and in which the proportion of stray light of the liquid crystal display used is minimal as a result of this determination.
IPC 1-7
IPC 8 full level
A61F 9/06 (2006.01); G02F 1/133 (2006.01)
CPC (source: EP KR)
A61F 9/067 (2013.01 - EP KR); G02F 1/13306 (2013.01 - EP KR); G02F 1/13318 (2013.01 - KR); G09G 3/18 (2013.01 - KR); G02F 1/13318 (2013.01 - EP); Y10S 323/906 (2013.01 - KR)
Citation (search report)
See references of WO 0054097A2
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
WO 0054097 A2 20000914; WO 0054097 A3 20020926; WO 0054097 A8 20030103; CH 694384 A5 20041215; CN 1559021 A 20041229; EP 1259852 A2 20021127; KR 20020007319 A 20020126; TW 527499 B 20030411
DOCDB simple family (application)
CH 0000040 W 20000128; CH 45899 A 19990311; CN 00807460 A 20000128; EP 00901013 A 20000128; KR 20017011384 A 20010907; TW 89103267 A 20000224