| 摘要 |
On the surface of a plastic base, there are formed, from the base side, an adhesion layer, a reflective layer formed mainly of Ag, and a protective layer formed of a light-transmitting dielectric layer. The adhesion layer is formed of a layer of a mixture of aluminum oxide and lanthanum oxide, and is given a thickness in the range from 10 nm to 120 nm. To further enhance the adhesion between the base and the Ag layer, and to surely prevent entry of moisture or the like from the base into the Ag layer, the mix proportion of lanthanum oxide in the adhesion layer is preferably kept in the range from 60% to 80% by weight.
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