Microporous filter

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 39/00 (2006.01) B01D 39/14 (2006.01)

Patent

CA 2541476

A laser-based drilling technique provides a microporous filter (10) having very small holes (30, 30') with known diameters and locations. One embodiment of the technique entails using a laser beam (62) with one or more uniform spot sizes to form each hole. The laser beam ablates material depthwise for corresponding known distances into a substrate (12) to form a desired number of hole steps (32, 38, 44) in each hole. Another embodiment of the technique entails using an imprint patterning toolfoil (80) to stamp in the substrate depressions (32, 38) of specified diameters and distances that correspond to the hole steps. In both embodiments, a laser beam of Gaussian shape removes the last portion of material to form a very small diameter final hole step (44).

Technique de perçage par laser qui permet d'obtenir un filtre microporeux (10) ayant de très petits trous (30, 30') à diamètre connu et à sites connus. Dans un mode de réalisation de ladite technique, un faisceau laser (62) ayant une ou plusieurs tailles de point uniformes est utilisé pour former chaque trou. Le faisceau laser enlève de la matière en profondeur, sur une distance correspondante connue, dans le substrat (12) pour former un nombre désiré de gradins (32, 38, 44) dans chaque trou. Dans un autre mode de réalisation de cette technique, une feuille outil (80) de structuration par estampage est utilisée pour former dans le substrat des dépressions (32, 38) ayant des diamètres spécifiés et des distances qui correspondent aux gradins des trous. Dans ces deux modes de réalisation, un faisceau laser à caractéristique gaussienne enlève la dernière partie de matière pour former un gradin (44) de trou final de très petit diamètre.

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