Ceramic heater

A ceramic heater including a ceramic insulator having a circular cross section, and a heating coil having an oval cross section, embedded in the insulator along the length thereof, and bent in a U-shaped form with the bend adjacent one end of the insulator. One of a pair of parallel coil portions defining the U-shaped coil has a long cross sectional diameter lying parallel to that of the other coil portion. The diameter of a cylinder defined by the outer surfaces of the coil portions and the outside diameter of the insulator have a ratio of 35:100 to 70:100.

申请(专利)号: US19830549327
申请日期: 1983年11月7日
公开(公告)日: 1985年3月5日
公开(公告)号: US4502430(A)
主分类号: F23Q7/00,F,F23,F23Q,F23Q7
分类号: F23Q7/00,H05B3/48,(IPC1-7):F02B9/08,F02P19/02,F,H,(,F23,H05,(IP,F02,F23Q,H05B,(IPC,F02P,F23Q7,H05B3,(IPC1-7):F02B9,F02P19
申请(专利权)人: NGK SPARK PLUG CO., LTD.