EP 3856359 A1 20210804 - A POLLUTION MASK AND CONTROL METHOD
Title (en)
A POLLUTION MASK AND CONTROL METHOD
Title (de)
VERSCHMUTZUNGSMASKE UND STEUERUNGSVERFAHREN
Title (fr)
MASQUE ANTI-POLLUTION ET PROCÉDÉ DE COMMANDE
Publication
Application
Priority
- CN 2018107705 W 20180926
- EP 18214381 A 20181220
- EP 2019075098 W 20190919
Abstract (en)
[origin: WO2020064476A1] An active fan-assisted pollution mask makes use of an optical sensor for detecting rotation of the fan and, during fan rotation, the speed of rotation. Breathing cycle detection and/or an automatic turn on and/or turn off function of the fan are implemented based on the analysis of the optical sensor signal. The use of an optical sensor provides a low cost and compact way to implement an automatic control function. It avoids the need for any particular fan design, since the detection is based on optical analysis of the fan rotation rather than analysis of electrical fan signals.
IPC 8 full level
A62B 18/00 (2006.01)
CPC (source: EP)
A62B 18/006 (2013.01); A62B 18/08 (2013.01)
Citation (search report)
See references of WO 2020064476A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
WO 2020064476 A1 20200402; CN 112770814 A 20210507; CN 112770814 B 20230609; EP 3856359 A1 20210804; EP 3856359 B1 20220615; JP 2021529269 A 20211028; JP 6944088 B1 20211006
DOCDB simple family (application)
EP 2019075098 W 20190919; CN 201980063446 A 20190919; EP 19769803 A 20190919; JP 2021510301 A 20190919