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Masks For Deposition Of Aspherical Optical SurfacesMasks of improved design developed for use in fabrication of aspherical, rotationally symmetrical surfaces of mirrors, lenses, and lens molds by evaporative deposition onto rotating substrates. In deposition chamber, source and mask aligned with axis of rotation of substrate. Mask shadows source of rotating substrate. Azimuthal opening (as function of radius) in mask proportional to desired thickness (as function of radius) to which material deposited on substrate. Combination of improved masks and modern coating chambers provides optical surfaces comparable or superior to those produced by conventional polishing, computer-controlled polishing, replication from polished molds, and diamond turning, at less cost in material, labor, and capital expense.
Document ID
19920000434
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Rogers, John R.
(Rochester Univ.)
Martin, John D.
(Rochester Univ.)
Date Acquired
August 15, 2013
Publication Date
July 1, 1992
Publication Information
Publication: NASA Tech Briefs
Volume: 16
Issue: 7
ISSN: 0145-319X
Subject Category
Fabrication Technology
Report/Patent Number
NPO-17995
Accession Number
92B10434
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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