Patent ID: 6043467
Filing Date: 2000-03-28
Classification: H05B

Abstract:
A thick film resistive heating element comprising:an electrically insulative substrate;a thick film resistive track applied to a surface of said electrically insulative substrate and terminating in respective electrical contact portions, said resistive track having a thickness; andan encapsulating insulating layer applied to said thick film resistive track but not over said electrical contact portions, said encapsulating insulating layer applied over at least a portion of said surface of said electrically insulative substrate in order to protect said thick film resistive track, an area of said surface of said electrically insulative substrate and of said thick film resistive track being uncovered by said encapsulating insulating layer so as to define a window adapted such that a temperature sensitive controller can be placed in direct contact with at least one of a portion of said thick film resistive track and a portion of said electrically insulative substrate, the resistive track within the window comprises a plurality of tracks which are thinner than the thickness of the resistive track outside the window.