A method of constructing a thin film mirror

B - Operations – Transporting – 29 – D

Patent

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B29D 11/00 (2006.01) G02B 1/04 (2006.01) G02B 5/10 (2006.01)

Patent

CA 2611922

A method of constructing a thin film mirror, which method comprises: (i) attaching a thin film (72) to a suction chamber (68), the suction chamber (68) having edges which are for attaching the thin film (72) and which lie in a desired geometry for the thin film mirror to be constructed; (ii) applying a partial vacuum to the suction chamber (68) such that tension is introduced into the thin film (72); (Hi) adjusting the partial vacuum to form the thin film mirror but with the thin film mirror achieving the desired geometry only over a portion of the thin film mirror; (iv) providing first tensioning means (78, 80) and locally adjusting the first tensioning means (78, 80) such that the portion of the thin film mirror which achieves the desired geometry is increased, the first tensioning means (78, 80) being in contact with the surface of the thin film (72) adjacent to the edge of the suction chamber (68) at a first distance which is substantially uniform from the edge of the suction chamber (68); and providing second tensioning means (82, 84) and locally adjusting the second tensioning means (82, 84) such that the portion of the thin film mirror which achieves the desired geometry is further increased, the second tensioning means (82, 84) being in contact with the surface of the thin film (72) adjacent to the first tensioning means (78, 80) at a second distance which is substantially uniform from the edge of the suction chamber (68), and which second distance is greater than the first distance from the edge of the suction chamber (68) of the first tensioning means (78, 80).

La présente invention concerne un procédé de construction d~un miroir à film mince, ledit procédé comprenant : (i) la fixation d~un film mince (72) à une chambre d~aspiration (68), la chambre d~aspiration (68) ayant des bords qui servent à fixer le film mince (72) et qui sont situés dans une géométrie voulue afin que le miroir à film mince puisse être construit ; (ii) l~application d~un vide partiel dans la chambre d~aspiration (68) de façon à ce qu~une tension soit introduite dans le film mince (72) ; (iii) le réglage du vide partiel afin de former le miroir à film mince mais avec le miroir à film mince atteignant la géométrie voulue seulement sur une partie du miroir à film mince ; (iv) la mise à disposition de premiers moyens de tension (78, 80) et le réglage local des premiers moyens de tension (78, 80) de façon à ce que la partie du miroir à film mince qui atteint la géométrie voulue soit augmentée, les premiers moyens de tension (78, 80) étant en contact avec la surface du film mince (72) adjacent au bord de la chambre d~aspiration (68) à une première distance qui est pratiquement uniforme à partir du bord de la chambre d~aspiration (68) ; et la mise à disposition de seconds moyens de tension (82, 84) et le réglage local des seconds moyens de tension (82, 84) de façon à ce que la partie du miroir à film mince qui atteint la géométrie voulue soit augmentée ultérieurement, les seconds moyens de tension (82, 84) étant en contact avec la surface du film mince (72) adjacent aux premiers moyens de tension (78, 80) à une seconde distance qui est pratiquement uniforme à partir du bord de la chambre d~aspiration (68), ladite seconde distance étant supérieure à la première distance à partir du bord de la chambre d~aspiration (68) des premiers moyens de tension (78, 80).

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