| 摘要 |
PROBLEM TO BE SOLVED: To maintain a half-reflection film normal, such as a deposition film to function as a half mirror of a combiner in a head up display even when temperature fluctuation occurs. SOLUTION: A combiner C is provided with a resin transparent plate 100, a deposition film 110, a hard coating film 120, and a shock absorbing film 130. The resin transparent film 100 comprises acrylic resin having a linear expansion coefficient of about 65×10<-6> in a plate form. The shock absorbing film 130 is formed of UV-setting type acrylic resin having a linear expansion coefficient of about 40×10<-6> on a visible side surface of the resin transparent plate 100. The deposition film 110 comprises films of titanium oxide and silicone oxide alternately deposited in lamination to function as a half mirror on the visible side surface of the shock absorbing film 130. Linear expansion coefficients of the titanium oxide and silicone oxide are within 6×10<-6> to 12×10<-6> .
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