Coating processes – Electrical product produced – Resistor for current control
Patent
1996-02-09
1997-01-14
Beck, Shrive
Coating processes
Electrical product produced
Resistor for current control
427103, 4273762, 4273835, 4273977, 427404, 4274192, 4274193, 4274194, 427554, 427555, B05D 512
Patent
active
055937225
ABSTRACT:
A method is provided for easily producing thick multi-layer substrates maintaining highly accurate resistances with little variation. A thick-film resistor 6 on a ceramic substrate 1 is fired at a temperature higher than the temperature of firing a glass insulating layer 2 that is formed thereon in contact therewith. This makes it possible to decrease the change in the resistance in a subsequent high-temperature step of firing the glass insulating layers 2 to 4. Moreover, after the glass insulating layer 2 is formed on the thick-film resistor 6 on the ceramic substrate 1, laser trimming is effected through a window or the glass insulating layer 2 and, thereafter, the glass insulating layers 3 and 4 are formed. This makes it possible to decrease the change in the resistance of the thick-film resistor 6 after laser trimming and to reduce the laser output.
REFERENCES:
patent: 4146673 (1979-03-01), Headley
patent: 4464421 (1984-08-01), Howell
patent: 4632845 (1986-12-01), Obstfelder
patent: 4796356 (1989-01-01), Ozaki
patent: 4830878 (1989-05-01), Kaneko et al.
patent: 5116641 (1992-05-01), Patel
Nagasaka Takashi
Otani Yuji
Saitou Mitsuhiro
Beck Shrive
Maiorana David M.
Nippondenso Co. Ltd.
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