Abstract: A sheet-like thermal sensing element includes a carbon fiber mixed paper and resin layers laminated on both surfaces of the carbon fiber mixed paper. Electrodes are provided along opposite two sides of the carbon fiber mixed paper. A temperature change can be detected by detecting the change of resistance value of the carbon fiber mixed paper. A sheet-like heater is also disclosed, the heater including a pair of carbon fiber mixed papers separated by an insulating sheet and surrounded by resin. Each of the carbon fiber mixed papers include electrodes thereon. The sheet like heater can both generate heat and detect temperature change for precise heating control. Also disclosed is a method of making both the sheet-like heater and sheet-like thermal sensing element involving producing the carbon fiber mixed paper, electrode formation, laminating the mixed papers together and resin encapsulation.

Abstract: A far-infrared radiator includes carbon fiber mixed paper and an organic compound layer laminated on both sides of the carbon fiber mixed paper. The far-infrared rays are radiated from the front surface and the back surface of the carbon fiber mixed paper by applying current to the carbon fiber mixed paper. The far-infrared rays radiated from the carbon fiber mixed paper cause resonance at a particular wavelength in the organic compound layer and the far-infrared rays in a wavelength range which depends on that wavelength are radiated. The wavelength range of the radiated far-infrared rays can be controlled by selecting the materials for the organic compound layer.