Patent ID: 7276293
Filing Date: 2007-10-02
Classification: C25D,H05B

Abstract:
1. A far infrared radiator comprising: a base of a material composed of aluminum or aluminum alloy, an alumite film having micropores formed on the surface of said base material having a deposited thickness that is heterogeneous; an electrolytic colored film comprising nickel or cobalt and having a thickness of 15 μm or more deposited on said alumite film from the bottom towards the top openings in said micropores of said alumite film; and fine irregularities in the interfacing surfaces of said base material and said alumite film, wherein the surface roughness of said electrolytic colored film is 1-20 μm in terms of 10-point mean roughness (Rz), the minimum value of the deposited thickness of nickel or cobalt is 2 μm, and the maximum value is 30 μm, said deposited nickel or cobalt is in metal form, and the integral emissivity of the radiator is in the wavelength range of 4-15 μm is 75% or more, and the heat resistance is 400° C. or higher.