Active edge controlled optical quality membrane mirror

Details Active edge controlled optical quality membrane mirror Active edge controlled optical quality membrane mirror

1999-01-15

2000-09-05

Spyrou, Cassandra

Optical: systems and elements

Mirror

Including specified control or retention of the shape of a...

G02B 508

Patent

active

06113242&

ABSTRACT:
A thin membrane is mounted on an optically flat circular outer ring and stretched over a smaller optically flat circular inner ring. Differential pressure is applied to the annulus formed between the inner and outer rings to prestrain the membrane and separately applied to the inner ring where the mirror figure will be produced. The inner ring has a doubly curved top surface and is optically fiat so that the membrane can freely move across the inner ring as incremental stress is applied via the annulus. A calculated combination of annulus stress and differential pressure on the inner ring produces an optical quality mirror figure in the inner ring area.

REFERENCES:
patent: 3326624 (1967-06-01), Maydell et al.
patent: 4162825 (1979-07-01), Dowty
patent: 4741609 (1988-05-01), Sallis
patent: 5016998 (1991-05-01), Butler et al.

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