Method for altering the coefficient of thermal expansion of a mi

Details Method for altering the coefficient of thermal expansion of a mi Method for altering the coefficient of thermal expansion of a mi

1993-06-22

1995-04-18

LaRoche, Eugene R.

Optical: systems and elements

Mirror

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

359848, 359850, G02B 508

Patent

active

054083621

ABSTRACT:
A front to back coefficient of thermal expansion difference between surfaces of a mirror segment is reduced by coating a selected surface. The other surface may be also coated in order to obtain an overall bulk coefficient of thermal expansion for the mirror segment. A plurality of mirror segments having coefficients of thermal expansion matched by coatings are selected for assembly thereby avoiding the need to physically change the positions of the various segments in order to bring them into correct relationship or to refocus the image using other optics.

REFERENCES:
patent: 2988959 (1961-06-01), Pelkey
patent: 3609589 (1971-09-01), Hufnagel
patent: 3754812 (1973-08-01), Mohn
patent: 4466700 (1984-08-01), Christiansen
patent: 4663234 (1987-05-01), Bouton
patent: 4670338 (1987-06-01), Clemino
patent: 4993824 (1991-02-01), Bluege

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