G - Physics
02
B
88/113
G02B 26/08 (2006.01)
Patent
CA 1296209
ABSTRACT MIRROR ASSEMBLIES A flexible mirror (10) comprising a reflectively coated membrane (12) overlying a circular chamber (14) has its membrane (12) tension controlled around the membrane periphery. The membrane periphery is secured by circularly-extending clamp surfaces formed between two rings (21,24) which are axially movably mounted by three bolts (22) and associated springs (23) which provide for coarse tension control when the membrane (12) is pulled down against the circular aperture (13) of structure (15). Fine tension control is provided by one ring (24) containing a segmented inner ring (32) the segments of which are independently operated by bolts (33) causing the segments to abut an O-ring (30) overlying membrane (12) and squashing the membrane (12) to a greater or less extent into an annular groove or channel (31) formed in the ring (21). The effectiveness of the tension control is monitored interferometrically.
547020
Gowling Lafleur Henderson Llp
University Of Strathclyde
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