Infrared reflective member, and infrared reflective device and method of making same
AssigneeToyoda Gosei Co., Ltd.
InventorsHiroaki Ando, Takeshi Miyazaki, Hiroshi Nakamura, Masahiko Ishii
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Abstract
The infrared reflective device includes infrared reflective members which reflect infrared rays. The infrared reflective members include colloidal particles arranged at regular spacing, and a filler material intervening in the spaces between the colloidal particles. The difference between the refractive index of the colloidal particles and the refractive index of the filler material is set so as to be 0.05 or less in the visible light region and 0.1 or above in the infrared region, whereby visible light is transmitted while infrared rays are reflected.
Claims7
An infrared reflective device for reflecting infrared rays, the infrared reflective device comprising multiple layers of an infrared reflective member,
- wherein each layer of the infrared reflective member includes:
- colloidal particles arranged at regular spacing;
- and
- a filler material intervening between the colloidal particles,
- wherein the each layer of the infrared reflective member satisfies a first condition and a second condition in difference between a refractive index of the colloidal particles and a refractive index of the filler material,
- wherein the first condition is 0.05 or below in visible light region, and the second condition is 0.1 or above at a wavelength in infrared region whose reflected wavelength exhibits a peak value satisfying a Bragg condition where at the wavelength in the infrared region infrared rays are reflected with high efficiency.
A method of making an infrared reflective device for reflecting infrared rays, the infrared reflective device comprising multiple layers of an infrared reflecting member,
- wherein each layer of the infrared reflective member comprises:
- colloidal particles arranged at regular spacing;
- and
- a filler material intervening between the colloidal particles,
- wherein the infrared reflective member satisfies a first condition and a second condition in difference between a refractive index of the colloidal particles and a refractive index of the filler material,
- wherein the first condition is 0.05 or below in visible light region, and the second condition is 0.1 or above at a wavelength in infrared region whose reflected wavelength exhibits a peak value satisfying a Bragg condition where at the wavelength in the infrared region infrared rays are reflected with high efficiency,
- the method comprises:
- preparing the filler material to serve as a solvent;
- adding the colloidal particles as a solute to the solvent to prepare a solution;
- stirring the solution by ultrasound to prepare a colloidal dispersion;
- and
- producing the infrared reflective device by applying the colloidal dispersion by multiple coatings to form the multiple layers of the infrared reflecting member.
Dependencies are inferred from the claim text.