Optical: systems and elements – Protection from moisture or foreign particle
Reexamination Certificate
2006-11-03
2008-05-20
Nguyen, Thong (Department: 2872)
Optical: systems and elements
Protection from moisture or foreign particle
C359S399000, C359S509000
Reexamination Certificate
active
07374294
ABSTRACT:
A method and apparatus for improving image quality in a reflector-type telescope are provided, through utilization of one or more nozzles disposed about the periphery of a reflecting mirror of the telescope, for directing a flow of air from a backside of the mirror across a concave reflecting surface of the mirror, to thereby sweep away and/or preclude formation of image distorting thermal boundary layers, or other impediments to image quality, resulting from the mirror not being in thermal equilibrium with ambient air surrounding the mirror. Supply nozzles are provided around a portion of the periphery of the mirror, and exhaust pick-up nozzles are provided around another portion of the periphery of the mirror, to thereby cause a flow of air to closely adhere to the concave surface of the mirror.
REFERENCES:
patent: 4561732 (1985-12-01), Japes
patent: 4979809 (1990-12-01), Peters
patent: 2006/0209543 (2006-09-01), Taguchi et al.
patent: 40 22 085 (1992-01-01), None
patent: 57-201306 (1982-12-01), None
patent: 61-184902 (1986-08-01), None
English translation of the Germany reference No. DE 40 22 085 A1.
Bryan Greer; “Understanding Thermal Behavior in Newtonian Reflectors”; Sky & Telescope magazine; Sep. 2000; pp. 125-133.
Alan Adler; “Thermal Management in Newtonian Reflectors”; Sky & Telescope magazine; Jan. 2002; pp. 132-136.
Nguyen Thong
Reinhart Boerner Van Deuren P.C.
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