Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Composite or multiple layer
Patent
1977-12-12
1981-03-10
Lowe, James B.
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Composite or multiple layer
264 28, 264219, 264261, 264334, B29D 1100
Patent
active
042553644
ABSTRACT:
A large scale mirror is replicated to an optical accuracy in the range of 1 arc minute. An optical master is created by annealing an acrylic liner sheet to a steel substrate in the constant presence of a vacuum. The acrylic is optically polished to complete the master. An epoxy layer is formed on the master. A rigid substrate such as a honeycomb sandwich is provided with a surface closely approximating the contour of the epoxy layer. The substrate is placed over the epoxy layer with a small generally uniform interstice therebetween. Elastomeric material is gently introduced into the interstice while avoiding any stresses, and subsequently cured. Backing irregularity print-through is avoided. Thereafter, the rigid assembly is separated from the master by flexing the acrylic liner.
REFERENCES:
patent: 2805974 (1957-09-01), Brucker
patent: 3153685 (1964-10-01), O'Connor
patent: 3317640 (1967-05-01), Jones
patent: 3322598 (1967-05-01), Marks et al.
patent: 3508987 (1970-04-01), Burkley et al.
patent: 4061518 (1977-12-01), Burroughs et al.
patent: 4124277 (1978-11-01), Stang
patent: 4129628 (1978-12-01), Tamutus
patent: 4155962 (1979-05-01), Neefs
"Epoxy Parabolic Mirrors", P. Archibald, Modern Plastics, Aug. 1957, pp. 116-117.
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