Apparatus and method for using bubble as virtual valve in...

Details Apparatus and method for using bubble as virtual valve in... Apparatus and method for using bubble as virtual valve in...

B - Operations, Transporting

41

J

B41J 2/05 (2006.01) B05B 17/04 (2006.01) B41J 2/055 (2006.01) B41J 2/14 (2006.01) B81B 1/00 (2006.01) B05B 1/14 (2006.01)

Patent

CA 2318983

An apparatus and method for forming a bubble (30) within a microchannel of a microinjector (12) to function as a valve mechanism between the chamber (14) and manifold (16), that provides for a high resistance to liquid exiting the chamber through the manifold during fluid ejection through an orifice (18) and that also provides a low resistance to refilling of liquid into the chamber after ejection of fluid and collapse of the bubble. This effectively minimizes cross talk between adjacent chambers and increases injection frequency of the microinjector. The formation of a second bubble (32) within the chamber (14) coalesces with a first formed bubble (30) between the chamber (14) and manifold (16) to abruptly terminate the ejection of fluid, thereby eliminating satellite droplets.

L'invention se rapporte à un procédé et à un appareil de formation d'une bulle (30) dans le microcanal d'un microinjecteur (12) dans le but d'utiliser cette bulle comme un mécanisme de type soupape entre la chambre (14) et le collecteur (16). Ladite bulle offre une résistance élevée au liquide sortant de la chambre par le collecteur au cours de l'éjection du fluide par un orifice (18) et elle offre une faible résistance au remplissage de la chambre avec le liquide après éjection du fluide et disparition de la bulle. Ceci permet de minimiser les interférences entre des chambres adjacentes et accroît la fréquence d'injection du microinjecteur. Une seconde bulle (32) formée à l'intérieur de la chambre (14) s'unit à une première bulle (30) formée entre la chambre (14) et le collecteur (16) et met fin brusquement à l'éjection du fluide, ce qui permet de supprimer les gouttelettes satellites.

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