Patent ID: 6392205
Filing Date: 2002-05-21
Classification: H01L,H05B

Abstract:
A disc heater applied to a temperature control apparatus which controls temperature of an object to be processed on at least one surface thereof, in which plural wire-like heating elements are laid on a plate surface in a predetermined pattern and at least one power feeding portion is disposed at ends of said wire-like hearing elements, whereinsaid pattern formed by said wire-like heating elements comprises a number of arc portions disposed on a number of concentric circles, connecting portions sequentially connecting one end of each of said arc portions with one end of each said arc portions toward a center, and arc portions on concentric circles having another concentric center which is different from that of said concentric circle, and a surface area of said arc portions is 85 to 95% of a surface area of the entire pattern, and said wire-like heating elements are connected to said at least one power feeding portion in parallel.