Apparatus and process for electrophoretic deposition

Details Apparatus and process for electrophoretic deposition Apparatus and process for electrophoretic deposition

1988-01-04

1993-03-23

Niebling, John

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204299EC, C25D 1300

Patent

active

051960982

ABSTRACT:
A method and apparatus for electrodeposition of insulating coatings such as photoresists having uniform thickness throughout the coating. The apparatus comprises one or more cathodes disposed in a bath containing an electrophoretic depositing composition, one or more anodes disposed in said bath in face to face relationship with the cathode, and means for applying a voltage between the anode and the cathode to produce a current whereby a current density gradient is formed on the cathode, the gradient comprising high and low current density areas. The anode of the present invention is configured so that the anode is concentrated opposite the high current density areas of the cathode, thereby controlling the thickness of deposition by controlling the amount of current flowing to the cathode.

REFERENCES:
patent: 2898279 (1959-08-01), Metcalfe et al.
patent: 3304250 (1967-02-01), Gilchrist
patent: 3320162 (1966-01-01), Gilchrist
patent: 3761371 (1973-09-01), Dickie
patent: 4162955 (1979-07-01), Schregenberger
patent: 4592816 (1986-06-01), Emmons et al.
Mohler, "Electrolytic Current Patterns", Metal Finishing, Mar. 1985.

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