Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Nonresinous material only
Patent
1996-02-06
1998-04-21
Fiorilla, Christopher A.
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Nonresinous material only
264 19, 264 26, 264 81, 264 82, B29D 1100
Patent
active
057414459
ABSTRACT:
A method of forming a light weight, closed-back mirror. The mirror is formed as a monolithic construction by the use of chemical vapor deposition techniques. A first deposition forms sheets of the material, which are machined to the proper size to form reinforcing ribs. A sacrificial mandrel is formed with grooves to receive the ribs in their assembled positions. The upper surface of the mandrel is in proximity to the rear edges of the ribs to form a substantially continuous surface. The mandrel and ribs are then subjected to a chemical vapor deposition process which forms a first coating upon the outer face of the mandrel, forming a back plate and side wall. The mandrel is then turned over, and the base is removed by machining to expose the front edges of the ribs. This process leaves islands of mandrel material between the ribs to form a substantially continuous surface. The mandrel and ribs are then subjected to a chemical vapor deposition process. This forms a second coating upon the lower surface of the mandrel, used as the mirror face. To reduce weight, holes are drilled through the back plate, and the remaining, encapsulated, mandrel material is removed by oxidation.
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Burns Lee E.
Pickering Michael A.
Taylor Raymond L.
CVD Incorporated
Fiorilla Christopher A.
Ross Taylor J.
White Gerald K.
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