US 9,810,876 B2
Manufacturing method for lightweight large-size telescope mirror blanks and mirror blanks fabricated according to same
Dar-Tson Shen, West Vancouver (CA)
Filed by Dar-Tson Shen, West Vancouver (CA)
Filed on Sep. 25, 2015, as Appl. No. 14/866,714.
Claims priority of provisional application 62/055,592, filed on Sep. 25, 2014.
Prior Publication US 2016/0187616 A1, Jun. 30, 2016
Int. Cl. G02B 7/183 (2006.01); C03B 23/20 (2006.01); G02B 5/08 (2006.01); C03B 23/00 (2006.01)
CPC G02B 7/183 (2013.01) [C03B 23/006 (2013.01); C03B 23/20 (2013.01); G02B 5/08 (2013.01)] 33 Claims
OG exemplary drawing
 
1. A method for manufacturing a mirror blank comprising:
providing a primary piece of glass comprising a primary planar surface and a backing piece of glass comprising a backing planar surface;
assembling a mirror blank assembly, wherein assembling the mirror blank assembly comprises interposing a plurality of glass splines between the primary glass and the backing glass, wherein interposing the plurality of glass splines comprises:
for each glass spline, abutting a first surface of the glass spline against the primary planar surface of the primary glass and abutting a second surface of the glass spline, the second surface opposed to the first surface, against the backing planar surface of the backing glass; and
arranging the plurality of glass splines to be circularly symmetric about an axis of symmetry that is orthogonal to the primary planar surface and the backing planar surface and to extend in directions that are radial from the axis of symmetry;
wherein, for each glass spline, a dimension l1 of the radial extension of the first surface which abuts the primary planar surface of the primary glass is greater than a dimension l2 of the radial extension of the second surface which abuts the backing planar surface of the backing glass; and
heating the mirror blank assembly to fuse the interposed glass splines to the primary glass and the backing glass while the primary glass and the secondary glass remain spaced apart from one another by the interposed glass splines to thereby provide the mirror blank.