Coating apparatus – Coated surface protecting means – e.g. – slip sheets
Patent
1993-07-29
1996-01-02
Snay, Jeffrey R.
Coating apparatus
Coated surface protecting means, e.g., slip sheets
118101, 118106, 118301, 118316, H05K 334, B05C 504
Patent
active
054804833
ABSTRACT:
An apparatus for depositing solder on the terminal pads of printed circuit boards in which a solder resist layer or layers having a thickness corresponding to the desired solder height border the pads. Molten solder from a reservoir is directed by nozzles against the sides of the board to fill the cavities extending above the terminal pads while the board is moving via a conveyor mechanism relative to the reservoir. The cavities when filled with molten solder are covered by a suitable element such as a flexible belt or roller. The molten solder within the covered cavities is then cooled below its solidification point and the covering element removed. If desired, part or all of the solder resist layer or layers may then be stripped from the board to leave solder pads extending above the surface of the board.
REFERENCES:
patent: 4127692 (1978-11-01), Boynton
patent: 4493857 (1985-01-01), Knigge
patent: 4539069 (1985-09-01), Fishman et al.
patent: 4720324 (1988-01-01), Hayward
patent: 5172853 (1992-12-01), Maiwald
Jackson Harold L.
Snay Jeffrey R.
Velie Circuits, Inc.
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