Optical element
AssigneeKonica Minolta Opto, Inc.
InventorsNobuyoshi Mori, Kazuo Ishida, Takuji Hatano, Setsuo Tokuhiro
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Abstract
An optical element for reflecting solar light has excellent weather resistance, and furthermore, a high reflectance in a wide band. When solar light enters an optical element (OE), light (L1) in a short wavelength band among the solar light is reflected by a dielectric multilayer film (DF). Other light (L2) in longer wavelength bands are passed through the dielectric multilayer film (DF), then a base material (SS), and reflected by a metal deposition film (MV) to pass through the base material (SS) and the dielectric multilayer film (DF). Thus, high reflectance in a wide band is ensured.
Claims8
A plate-shaped optical element for reflecting sunlight, comprising:
- a base plate composed of a resin film;
- a first reflective film;
- and
- a second reflective film;
- wherein the base plate and the first reflective film are arranged at a sunlight-entering side so that the second reflective film reflects light having passed through the base plate and the first reflective film, the first reflective film has a reflectance ratio of 90% or more for light having a wavelength of 1.0 μm or less and the second reflective film has a reflectance ratio of 90% or more for light having a wavelength of 1.0 μm or more, and
- wherein the first reflective film is a dielectric multilayer film.
Dependencies are inferred from the claim text.