Durable first and second surface mirrors

Details Durable first and second surface mirrors Durable first and second surface mirrors

G - Physics

02

B

G02B 5/08 (2006.01) G02B 1/10 (2006.01)

Patent

CA 2120877

ABSTRACT DURABLE FIRST AND SECOND SURFACE MIRRORS Durable first and second surface mirrors are disclosed. The first surface mirror achieves 97% or better reflection of visible light, whereas the second surface mirror achieves 88% or better reflection of visible light. Each mirror has a reflective metal layer that is situated between two metal precoat layers. These precoat layers comprise either nickel-chromium alloy or a mixture of nickel and chromium nitride that are thin to minimize absorption of visible light but yet maintain their adhesive properties. In one embodiment of the invention, the first surface mirror comprises and aluminum substrate onto which is deposited a thin film design consisting of seven layers, namely: titanium, nickel-chromium alloy, silver, nickel-chromium nitride, silicon nitride, silicon dioxide, and titanium dioxide. In an embodiment of the second surface mirror, the mirror comprises a glass substrate onto which is deposited a thin film design consisting of five layers, namely: silicon dioxide, nickel-chromium nitride, silver, nickel-chromium nitride, and silicon nitride. To provide further protection, an overcoat comprising a laminate or other protective coating can be applied over the second surface mirror.

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