Heat-resistant protective shield

Abstract

Provided is a heat-resistant protective shield, which sequentially comprises a polycarbonate molded object, a silicon dioxide hard coating, a copper-zinc alloy layer and a dielectric layer, wherein the dielectric layer comprises titanium nitride, zirconium nitride, zirconium dioxide or a combination thereof; the copper-zinc alloy layer has a thickness of 0.2 μm to 3.0 μm, the dielectric layer has a thickness of 10 nm to 999 nm, and the copper-zinc alloy layer and the dielectric layer have a thickness ratio of 1:1 to 100:1. The heat-resistant protective shield has good heat resistance, visible light transmittance and infrared light transmittance along with the advantage of cost reduction, and it also has change rates of the visible light transmittance and the infrared light transmittance of less than or equal to 100% after being heat treated at a temperature of 60° C. and a relative humidity of 90RH % for 200 hours, indicating a relatively good stability and being suitable for long term use.

Dependencies are inferred from the claim text.