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:
May. 01, 2012
Filed:
Nov. 25, 2008
Michael J Cangemi, Victor, NY (US);
Horst Schreiber, Rochester, NY (US);
Jue Wang, Fairport, NY (US);
Michael J Cangemi, Victor, NY (US);
Horst Schreiber, Rochester, NY (US);
Jue Wang, Fairport, NY (US);
Corning Incorporated, Corning, NY (US);
Abstract
The invention is directed to optical elements that are coated with dense homogeneous fluoride films and to a method of making such coated elements. The coatings materials are a high ('H') refractive index fluoride material and a low ('L') refractive index material that are co-evaporated to form a coating layer of a L-H coating material (a co-deposited coating of L and H materials). Lanthanide metal fluorides (for example, neodymium, lanthanum, dysprosium, yttrium and gadolinium, and combinations thereof) are preferred metal fluorides for use as the high refractive index materials with lanthanum fluoride (LaF) and gadolinium fluoride (GdF) being particularly preferred. Aluminum fluoride (AlF) and alkaline earth metal fluorides (fluorides of calcium, magnesium, barium and strontium) are the preferred low refractive index materials, with magnesium fluoride (MgF) being a preferred alkaline earth metal fluoride.