| 摘要 |
PURPOSE:To improve mechanical strength to exfoliation, etc. and optical characteristics such as reflectivity and transmittance, etc. by forming a half mirror of the 1st thin film layer consisting of one kind among specific compds. formed on the end face of a glass substrate, a half-reflecting layer formed on said layer and consisting of aluminum and the 2nd thin film layer formed on the semi-reflecting layer and consisting of one kind among plastics and the compds. forming the 1st thin film layer. CONSTITUTION:A half mirror 8 consists of the 1st thin film layer 8 formed on the end face of a glass substrate 3b, a semi-reflecting layer 8b and the 2nd thin film layer 8c. The layer 8a consists of one kind among magnesium difluoride, silicon dioxide, silicon monoxide and titanium dioxide and the layer 8b consists of aluminum. The layer 8c consists of one kind among plastics, magnesium difluoride, silicon dioxide, silicon monoxide and titanium dioxide. The thickness of the layer 8a is about 0.1-0.2mum, the thickness of the layer 8b 0.03-0.04mum and the thickness of the layer 8c 0.05-0.1mum. the reflectivity and transmittance are thus improved by adjusting the thickness of the layer 8a by which the vapor deposition power of the aluminum is improved as well. The surface is protected and the exfoliation and flawing are prevented by the layer 8c.
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