Heater and glow plug provided with same

Abstract

A heater includes: a resistor including a heat-generating portion; a lead joined to an end portion of the resistor; and an insulating base covering the resistor and the lead. At a junction between the resistor and the lead, the lead has a shape thicker than the resistor and is connected to the resistor such that the end portion of the resistor is inserted into a front end portion of the lead, a recess is provided on an end surface of the resistor, and a portion of the lead is inserted into the recess.

1 . A heater comprising:
 an insulating base;   a resistor buried in the insulating base; and   a lead buried in the insulating base, connected at a front end side thereof to the resistor, and drawn out at a rear end side thereof to a surface of the insulating base, wherein   the lead comprises a shape thicker than the resistor and is connected to the resistor such that an end portion of the resistor is inserted into a front end portion of the lead, a recess is provided on an end surface of the resistor, and a portion of the lead is inserted into the recess.   
     
     
         2 . The heater according to  claim 1 , wherein the recess is provided at a center of the end surface of the resistor. 
     
     
         3 . The heater according to  claim 1 , wherein no corner is present in an inner surface of the recess. 
     
     
         4 . The heater according to  claim 1 , wherein the recess is provided on both end surfaces of the resistor. 
     
     
         5 . The heater according to  claim 1 , wherein the end portion of the resistor is inserted into the front end portion of the lead so as to be surrounded by the front end portion of the lead. 
     
     
         6 . A glow plug comprising:
 the heater according to  claim 1 ; and   a metallic retaining member which is electrically connected to the lead and retains the heater.