Patent ID: 7495542

Claim:
A film temperature sensor comprising: a base film made of an insulating material; a plurality of thin-film thermal elements integrally formed either on a surface or in a thickness of said base film; a plurality of thin-film leads integrally formed either on the surface of said base film or in the thickness thereof, and connected to said plurality of thermal elements; and a plurality of terminals integrally formed either on the surface or in the thickness of said base film, and connected to said plurality of leads, wherein each of said plurality of thermal elements is a resistor pattern of a serpentine thin-film resistor line covering each of a plurality of temperature measurement zones on said base film, and having electrical resistivity that changes in accordance with a temperature; and when R stands for a representative resistance value within a range of measurement temperatures of said resistor pattern, H stands for a dimension in a longitudinal direction of said temperature measurement zone, T stands for a thickness of the thin film of said resistor line, ρ stands for a electrical resistivity of said conductive material, A stands for a width of said resistor line, and k stands for a ratio of a width of a space between adjacent resistor lines relative to the width A of said resistor line, the width A of said resistor line of said resistor pattern is selected from within the range of: (2/3)( H 2 ρ/(1 /k )· T·R )≦ A 2 =( H 2 ρ/(1/ k )· T·R ).