| 摘要 |
PURPOSE:To make a titled half mirror have the spectroscopic reflection factor characteristics extending from a visible area to an infrared area, to reduce light absorption, to visually recognize the display information easily, and to reflect a heat ray, by constituting the half mirror by providing a dielectric multilayered film on front glass of a car. CONSTITUTION:A titled half mirror is formed by providing optical thickness of 0.25lambda0 vapor-deposited layer of titanium dioxide, 0.22lambda0 vapor-deposited layer of magnesium fluoride, and 0.22lambda0 vapor-deposited layer of zirconium oxide in order toward the air side on front glass 2. lambda0, however, is regulated in a range from 550nm to 700nm in relation to wavelength of a light emitting spectrum of the information display part. This half mirror has the spectroscopic reflection characteristics extending from a visible area to an infrared area, and especially, its maximum reflection factor nearly coincides with the light emitting wavelength of a red light emitting diode used as an information display element, therefore, the information is reflected efficiently, and in other part, the spectroscopic reflection factor drops suddenly. |
