Global Patent Index - EP 1259852 A2

EP 1259852 A2 2002-11-27 - 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

EP 1259852 A2 (DE)

Application

EP 00901013 A

Priority

  • CH 0000040 W
  • CH 45899 A

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 (main, further and additional classification)

G02F 1/133; A61F 9/06; G09G 3/18

IPC 8 full level (invention and additional information)

A61F 9/06 (2006.01); G02F 1/133 (2006.01)

CPC (invention and additional information)

A61F 9/067 (2013.01); G02F 1/13306 (2013.01); G02F 1/13318 (2013.01)

Citation (search report)

See references of WO 0054097A3

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

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

INPADOC legal status


2005-02-02 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20040803

2003-03-19 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20030204

2002-11-27 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20010903

2002-11-27 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A2

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

2002-11-27 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Free text: SI PAYMENT 20010903