| 摘要 |
PURPOSE:To obtain the mirror suitable to use for a main mirror of a single lens reflex camera by alternately laminating a transparent dielectric having a high refractive index and a dielectric having a low refractive index at a visible wavelength region respectively. CONSTITUTION:The titled mirror comprises a substrate plate G, an air layer Air and a translucency mirror part H. The translucency mirror part H is constituted by the first layer 1, the second layer 2, the third layer 3...the sixth layer 6 and the seventh layer 7 in order from the air side to the substrate side. The first-fourth layers belong to the A group A, and the fifth...seventh layers belong to the B group B. The max. optical film thickness among those of the A group is smaller than the min. optical film thickness among those of the B group. The first, third, fifth and seventh layers 1, 3, 5, and 7 are the dielectric layers having the higher refractive index than that of the substrate G. While, the second, fourth and sixth layers 2, 4, 6 are the dielectric layers having the lower refractive index than that of the substrate G. The titled mirror is prepared by alternately laminating the dielectric layers having the high refractive index and the low refractive index respectively on the substrate G.
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