Protective layers for optical coatings

a protective layer and optical coating technology, applied in coatings, transportation and packaging, chemical instruments and processes, etc., can solve the problems of optical coatings that are often damaged, adhesive films run the risk of removing parts of optical coatings, and silver based low-emissivity coatings in particular have been plagued with corrosion problems, so as to reduce the number and severity of scratches
US20050260419A1Inactive Publication Date: 2005-11-24AFG IND INC
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
AFG IND INC
Publication Date
2005-11-24
Estimated Expiration
Not applicable · inactive patent

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Abstract

An optical coating on a transparent substrate is provided with a temporary layer of carbon as protection during manufacturing against scratches and corrosive environments. When the optical coating and / or substrate are tempered in an atmosphere reactive to carbon, such as air, the layer of carbon is removed as a carbon-containing gas. For an optical coating with a brittle, glassy, outermost layer furthest from the substrate, additional protection is provided by a scratch propagation blocker layer between the outermost layer and the carbon protective layer.
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Description

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] This invention relates to protective layers applied to optical coatings on transparent substrates. In particular, the invention relates to the use of a temporary protective layer of carbon. In addition, the invention relates to a scratch propagation blocker (SPB) protective layer applied to the outermost layer of various optical coatings.

[0003] 2. Discussion of the Background

[0004] Optical coatings are deposited on transparent substrates to reflect or otherwise alter the transmission of some or all of the radiation incident on the substrates. For example, the optical coating of a mirror is designed to reflect visible light. Low-emissivity optical coatings are designed to reduce the transmission of infrared radiation. Optical coatings generally include two or more different layers each having a thickness in a range of from less than 1 nm to over 500 nm.

[0005] Optical coatings are frequently damaged during shipping...

Claims

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