A method of constructing a thin film mirror

B - Operations – Transporting – 29 – D

Patent

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B29D 11/00 (2006.01) B29C 41/50 (2006.01) B29C 51/10 (2006.01)

Patent

CA 2736286

Method for producing a large size mirror from a thin film, involving (a) the attachment of a thin film to a suction chamber, the edge of which has the required geometry of the mirror, and (b) the production of a controllable partial vacuum in the suction chamber so that the thin film takes on the required geometry of the mirror. The method is characterized in that the region of the mirror having the required geometry is enlarged by preshaping the thin film, prior to the attachment thereof to the suction chamber, by controlled tensioning in a closed pressurization chamber comprising two circular discs with a common axis and a thin film which is attached to the edges of said discs and the lateral sides of which are conjoined so as to form a conical surface, and by additionally tensioning the thin film by means of a mechanism for moving the discs apart along the common axis thereof. In order to facilitate and accelerate the process of forming a mirror from a thin film, the pressurization chamber together with the thin film attached thereto is placed in a thermal box in which the film is uniformly heated to an optimum temperature for deforming the film under increased pressure in the pressurization chamber.

Le procédé de fabrication dun miroir concave de grandes dimensions à partir dun film mince consiste en ce qui suit : (a) fixer le film mince à un chambre de succion dont le bord possède une géométrie du miroir prédéterminée; et (b) créer un vide partiel contrôlé dans la chambre de succion pour conférer à la surface du film mince la géométrie du miroir prédéterminée. Il se distingue en ce que lélargissement de la zone du miroir à géométrie prédéterminée se fait par la fixation du film mince préalable à son apposition sur la chambre de succion, qui est préalablement déformée par étirement contrôlé dans une chambre de surpression fermée qui est constituée de deux disques ronds possédant un axe commun et de film mince fixé aux bords de ces disques et reliée par ses côtés latéraux de manière à former une surface conique; et en ce que le film mince subit un prétensionnement supplémentaire réalisé grâce à des mécanismes décartement des disques le long de leur axe commun. Pour faciliter et accélérer le processus de formation du miroir à partir dun film mince la chambre de surpression ainsi que le film mince collé à celle-ci son placés dans une boîte thermique dans lequel on chauffe graduellement le film mince jusquà une température optimale pour la déformation du film sous leffet dune pression accrue dans la chambre de surpression.

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