Process for the manufacture of thick layer varistors on a hybrid

Details Process for the manufacture of thick layer varistors on a hybrid Process for the manufacture of thick layer varistors on a hybrid

1982-08-31

1984-07-17

Lusignan, Michael R.

Coating processes

Electrical product produced

Resistor for current control

427103, 427282, 4273762, 338 21, 338307, 338308, 338309, H01C 712

Patent

active

044606249

ABSTRACT:
The invention relates to a process for the manufacture of non-linear resistors (varistors) from thick-layer ceramic material, in particular on a hybrid circuit substrate, or any other device requiring that a predetermined temperature should not be exceeded during its manufacture.
According to the invention, after crushing a ceramic material in order to obtain a very fine powder of varistor material, a powder is produced of conductive or semiconductive material able to assume the pasty state at a temperature lower than 850.degree. C. and a binder is incorporated therein to obtain a screen printing paste. The layer deposited by screen printing on a substrate such as glass, is dried and then heat treated so as to assure cohesion of the layer. This layer is either inserted between a previously deposited electrode and another electrode, or covered by two separate electrodes. The invention is particularly applicable to matrix access display screens.

REFERENCES:
patent: 3598762 (1971-08-01), Futaki et al.
patent: 3622523 (1971-11-01), Amin et al.
patent: 3670221 (1972-06-01), Hamamoto et al.
patent: 3725836 (1973-04-01), Wada et al.
patent: 3836340 (1974-09-01), Conwicke
patent: 3839231 (1974-10-01), Patterson et al.
patent: 3916366 (1975-10-01), Jefferson
patent: 4041436 (1977-08-01), Kouchich et al.
patent: 4333861 (1982-06-01), Aoki et al.

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