abstract |
An object of the present invention is to provide a hot plate in which a transmittance of a ceramic substrate is not more than 10%, thereby measuring a temperature of a heating face by a thermoviewer more accurately, and the present invention is a hot plate comprising a ceramic substrate and a conductor layer formed on a surface of said ceramic substrate or inside said ceramic substrate, wherein a transmittance of an infrared ray wavelength, of said substrate, is 0% or not more than 10%. |