Patent ID: 8633390

Claim:
An injection nozzle ( 30 ) heated by an electric heater and comprising an electric hookup ( 50 ; 60 ) being fitted with a hookup stem ( 48 ; 70 ), where (a) the heater is a thick film heater comprising a dielectric layer ( 42 ), and a heating conductor track ( 44 ) deposited on the outer surface of the dielectric layer ( 42 ), (b) the hookup stem ( 48 ; 70 ) comprises a shank element ( 54 ; 72 ) and a connecting segment ( 56 ; 74 ) making contact with the minimum of one adhesion layer ( 62 ; 64 ; 66 ) and/or a contact paste ( 52 ), (c) the connecting segment ( 56 ; 74 ) is discoid and exhibits a larger diameter than does the shank element ( 54 ; 72 ), (d) at least one transition element ( 58 ; 76 ) is provided between the shank element ( 54 ; 72 ) and the connecting segment ( 56 ; 74 ) and is designed in a manner that the diameter of the shank element ( 54 ; 72 ) and that of the connecting segment ( 56 ; 74 ) merge into each other step-wise or continuously, (e) the hookup stem ( 48 ; 70 ) is designed in a manner it may be affixed by means of at least one electrically conducting adhesion layer ( 62 ; 64 ; 66 ) and the contact paste ( 52 ) to said heater, and (f) at least two electrically conducting adhesion layers ( 62 , 64 , 66 ) are configured between the connecting segment ( 56 ; 74 )of the hookup stem ( 48 ; 70 ) and the heater in a manner to connect them, the adhesion layers ( 62 , 64 , 66 ) and the contact paste ( 52 ) exhibiting different properties, different compositions and/or different adhesion layer materials, (g) wherein, each adhesion layer ( 52 , 62 , 64 , 66 ) is matched to the particular directly adjacent adhesion layer ( 52 , 62 , 64 , 66 ) and/or to a directly adjacent, electrically conducting component ( 44 , 48 ; 62 ; 70 ) to produce a stable connection therebetween.