Apparatus for coating surfaces of a substrate

Details Apparatus for coating surfaces of a substrate Apparatus for coating surfaces of a substrate

1982-06-21

1983-05-17

Smith, John D.

Coating apparatus

Immersion or work-confined pool type

Mask or stencil

118213, 118408, H05K 312, H05K 342

Patent

active

043834957

ABSTRACT:
The walls 41 (FIG. 4) of thru holes 11 in a printed wiring board substrate 12 are coated with a liquid 24 by inserting fingers 22 into the thru holes. Each of the fingers has a diameter slightly less than the diameter of the associated thru hole and has a length no greater than the thickness of the substrate 12. After ink 24 has been applied to the top surface of the substrate, the inserted fingers 22 are withdrawn, thereby drawing the ink down into the thru holes and coating the walls 41. In another embodiment, fingers 62 are aligned with selected portions 52 of an edge 55 of the substrate 50 to coat the portions of the edge as the fingers are moved by the edge after the heads of the fingers have been coated with the ink 24.

REFERENCES:
patent: 3121020 (1964-02-01), Low
patent: 3158503 (1964-11-01), Young
patent: 3301175 (1967-01-01), Polichette
patent: 3357856 (1968-01-01), Ragan et al.
patent: 3576669 (1971-04-01), Filip
patent: 3604391 (1971-09-01), Mallia et al.
patent: 4024629 (1977-05-01), Lemoine et al.

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