Method and apparatus for constructing a thin film mirror
Systems and methods for constructing a thin film mirror are provided. The apparatus includes a vacuum chamber having edges. Adjacent the vacuum chamber is at least one extender having an edge that is spaced from and extending beyond the adjacent edge of the vacuum chamber in two directions. In this manner, the thin film does not contact the vacuum chamber until force is applied to the thin film, such as by mechanical tensioning mechanisms or application of a partial vacuum.
1. An apparatus for constructing a thin film mirror comprising:
a vacuum chamber having a top edge and a bottom edge;
a first extender having an edge generally adjacent the vacuum chamber, the first extender edge and the vacuum chamber top edge being spaced apart along their respective lengths with the first extender edge extending beyond the top edge of the vacuum chamber;
a second extender having an edge opposing the first extender and generally adjacent the bottom edge of the vacuum chamber, the second extender edge and the bottom edge of the vacuum chamber being spaced apart along their respective lengths with the second extender edge extending beyond the bottom edge of the vacuum chamber;
wherein the first extender edge and the second extender edge are positioned such that a thin film extending from the first extender edge to the second extender edge would not intersect the top edge and bottom edge of the vacuum chamber.
2. The apparatus of claim 1 wherein at least one of the first extender or the second extender has a generally L-shaped cross section such that when placed adjacent the vacuum chamber, the combination of the first extender or the second extender and the vacuum chamber has a generally U-shaped cross-section.
3. The apparatus of claim 1 wherein the end of at least one of the first extender or the second extender is not sealed.
4. The apparatus of claim 1 wherein a sealed chamber is formed by the first extender and the vacuum chamber.
5. The apparatus of claim 1 wherein each of the first extender edge and the second extender edge includes a generally flat mounting surface for mounting the thin film.
6. The apparatus of claim 1 wherein the first extender edge is adjustable with respect to the remainder of the first extender or the second extender edge is adjustable with respect to the remainder of the second extender.
7. The apparatus of claim 1 wherein each of the first extender and the second extender is structurally rigid.
8. The apparatus of claim 1 further comprising at least one tensioning rod adjacent the vacuum chamber.
9. The apparatus of claim 1 further comprising at least one tensioning rod between the top edge and the first extender edge or the bottom edge and the second extender edge.
10. The apparatus of claim 8 further comprising a plurality of tensioning devices adapted to apply force to the tensioning rod.
11. The apparatus of claim 9 wherein at least one of the plurality of tensioning devices is adapted for fixation to at least one of the first extender or the second extender.
12. The apparatus of claim 1 further comprising a skinning attachment positioned on the side of the vacuum chamber with respect to the orientation of the thin film mirror and adapted to mate with the vacuum chamber, the first extender and the second extender.
13. The apparatus of claim 12 wherein the skinning attachment comprises a first set of film mount surface extensions corresponding to the first extender edge and the second extender edge, and a second set of film mount surface extensions corresponding to a first vacuum chamber edge and a second vacuum chamber edge.
14. The apparatus of claim 1 wherein the first extender edge and the second extender edge are positioned along a generally circular arc.
15. The apparatus of claim 14 wherein the first extender edge, the top edge, the bottom edge, and the second extender edge are positioned along a generally circular arc.
16. The apparatus of claim 1 wherein the first extender edge and the second extender edge are positioned above and below the vacuum chamber with respect to the orientation of the thin film mirror.
17. The apparatus of claim 1 further comprising a clamp on the edge of the vacuum chamber adjacent the first extender or on the edge of the vacuum chamber adjacent the second extender.
18. A thin film mirror constructed using the apparatus of claim 1 .
19. A method for constructing a thin film mirror comprising:
providing a vacuum chamber having a top edge and a bottom edge on opposing sides of the vacuum chamber;
providing an extender having an edge generally adjacent an adjacent edge of the vacuum chamber, the adjacent edge being at least one of the top edge or the bottom edge, the extender edge and the adjacent edge spaced apart along their respective lengths with the extender edge extending beyond the adjacent edge of the vacuum chamber such that a thin film extending from the extender edge to the top edge or bottom edge opposite the adjacent edge passes over and does not intersect the adjacent edge;
securing the thin film to the extender edge; and
applying force to the thin film between the extender edge and the adjacent edge sufficient to bring the thin film into contact with the adjacent edge.
20. The method of claim 19 further comprising providing a second extender having an edge generally adjacent an opposite adjacent edge, the opposite adjacent edge being the top edge or the bottom edge opposite the adjacent edge, the second extender edge and the opposite adjacent edge being spaced apart along their respective lengths and the second extender edge extending beyond the opposite adjacent edge of the vacuum chamber such that a thin film extending from the extender edge to the second extender edge would not intersect the top edge or the bottom edge of the vacuum chamber.
21. The method of claim 20 further comprising securing the thin film to the second extender edge.
22. The method of claim 19 , wherein a sealed chamber is formed by the vacuum chamber and the extender, and wherein applying force to the thin film comprises applying a partial vacuum to the chamber formed by the vacuum chamber and the extender.
23. The method of claim 19 wherein applying force to the thin film comprises using a tensioning rod.
24. The method of claim 19 further comprising using a plurality of tensioning devices to adjust the force of the tensioning rod on the thin film.
25. The method of claim 19 further comprising attaching a skinning attachment the side of the vacuum chamber with respect to the orientation of the thin film mirror such that the skinning attachment mates with the vacuum chamber and the extender.
26. The method of claim 19 further comprising applying a partial vacuum to the vacuum chamber.
27. The method of claim 26 further comprising using a plurality of tensioning devices to adjust the thin film after applying the partial vacuum.
28. The method of claim 19 further comprising clamping the thin film to the edge of vacuum chamber adjacent the extender edge.
29. A thin film mirror constructed using the method of claim 19 .