Methods and apparatus for providing an absorbing, broad band, lo

Details Methods and apparatus for providing an absorbing, broad band, lo Methods and apparatus for providing an absorbing, broad band, lo

1996-02-01

1998-03-17

Turner, Archene

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428426, 428432, 428698, 428701, 428702, 359359, 359361, 359580, 359589, G32B 904

Patent

active

057284563

ABSTRACT:
The present invention relates to electrically-conductive, absorbing, contrast-enhancing antireflection coatings having excellent optical properties characterized by, specifically, a large bandwidth ratio, i.e., a ratio indicative of the range of wavelengths for which the reflectance value is less than 0.6%, and a small brightness value for the visible wavelengths. It has been surprisingly discovered that a simple, two-layer substrate coating consisting of only a first thin layer of a transparent material having a low refractive index and a second very thin layer of an absorbing, electrically conductive, transition metal oxynitride material provides high performance, electrically conductive, contrast-enhancing antireflection coatings having small brightness values and large bandwidth ratios. The present invention provides antireflection coatings having brightness values less than or equal to about 0.22, and preferably less than or equal to about 0.15. One important advantage of the present invention is that, due to the simplicity of the design and the suitability and efficiency of deposition of the materials in an in-line DC reactive magnetron sputtering process, the high performance, absorbing, electrically conductive, and contrast-enhancing antireflection coatings in accord with the present invention can be produced in a very cost-effective manner.

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Lockhart, L. and King, P., Three-Layered Reflection-Reducing Coatings, J. Opt. Soc. Am, 1947; 37:689-94.
Szczyrbowski, S.R., Szczyrbowski, K.H. Leybold, A.G., Simple Antireflection Coatings for Cathode Ray Tube and Other Display Devices, Hanau, West Germany.
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