Claims
- 1. A method of automatically dip coating and then simultaneously ultraviolet curing a conformal coating on both sides of a circuit board comprising:
- positioning a circuit board, to be coated on both sides with a conformal coating, on a tool;
- advancing said tool toward a dip tank containing a ultraviolet curable conformal coating so that both sides of said circuit board are at least partially immersed in said conformal coating;
- advancing said tool past oppositely positioned ultraviolet lamps so that the conformal coating on both sides of said circuit board is simultaneously cured by ultraviolet light; and
- providing a nitrogen blanket on said conformal coating in said dip tank at a rate of about 1600 to about 1800 cubic feet/hour to prevent said conformal coating from curing in said dip tank.
- 2. A method of automatically dip coating and then simultaneously ultraviolet curing a conformal coating on both sides of a circuit board comprising:
- positioning a circuit board, to be coated on both sides with a conformal coating, on a tool said tool carried by a tool bar;
- advancing said tool toward a dip tank containing a ultraviolet curable conformal coating so that both sides of said circuit board are at least partially immersed in said conformal coating;
- advancing said tool past oppositely positioned ultraviolet lamps so that the conformal coating on both sides of said circuit board is simultaneously cured by ultraviolet light; and
- adjusting the vertical position of a guide bar slidably secured on two shoulder pins attached to the dip tank so that said tool bar rides across said guide bar as the tool is advanced so that both sides of said circuit board are at least partially immersed in said conformal coating.
Parent Case Info
This is a continuation-in-part of U.S. Ser. No. 07/843,385, filed Feb. 28, 1992, now abandoned, and the benefit of the prior filing date is hereby claimed.
US Referenced Citations (32)
Non-Patent Literature Citations (4)
Entry |
Anonymous, "Surface Mount Integrated Circuit Conformal Coating Process," (Disclosure 30686), Research Disclosure, pp. 753-754 (Oct. 1989). |
Nordson Select Coat System (Brochure No. 306-18-857), 1989 (no month date). |
CL7000 Selective Conformal Coating & Drying, integrated technologies, Inc. (no date). |
S5000 Selective Coating, integrated technologies, Inc. (no date). |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
843385 |
Feb 1992 |
|