The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 24, 1976
Filed:
Sep. 09, 1974
William P Barnes, Jr, Acton, MA (US);
G Richard Wirtenson, Acton, MA (US);
Itek Corporation, Lexington, MA (US);
Abstract
A mirror structure designed to minimize damage to the mirror caused by soft X-rays. A reflective coating having a high reflectivity at wavelengths of interest is deposited on a glass substrate. The reflective coating has a moderately low atomic number to reduce direct susceptibility to substantial X-ray damage, and further has a high coefficient of thermal conductivity so that it is a good conductor of heat from the reflective coating to the glass substrate. Unfortunately, glass is a poor conductor of heat, and the accumulation of absorbed energy in the reflective coating will rapidly lead to crazing, melting, and vaporization. Accordingly the mirror structure is designed with a heat sink coating between the reflective coating and the glass substrate. The heat sink coating has a higher coefficient of thermal conductivity than glass so that it conducts heat away from the reflective coating, and also has an atomic number which is lower than glass so that it is subject to less X-ray energy absorption. In one disclosed embodiment, the reflective coating is aluminum and the hat sink coating is beryllium.