Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board
Patent
1991-04-19
1993-01-19
Lusignan, Michael
Coating processes
Electrical product produced
Integrated circuit, printed circuit, or circuit board
427510, 427521, C23C 2600
Patent
active
051806118
ABSTRACT:
An open-weave conveyor moves a printed wiring board through a region of radiant energy. The conveyor has a plurality of supporting projections extending from the major surface of the conveyor to minimize engagement between the conveyor and the board, providing at least three projections supporting each board above the open-weave conveyor to eliminate a shadow effect caused by radiation blocked by conveyor strands. Guides move the conveyor along an arcuate path away from the printed wiring board in the radiation region, assuring irradiation of the entire printed wiring board surface. This technique is advantageous for simultaneously irradiating both sides of a board during a dry film solder masking technique. The solder mask is radiated to promote cross-linking of the film polymer. To reduce thermal shock and abrupt temperature rise in the workpiece, the ultraviolet source includes a water envelope to absorb infrared radiation. A series of irradiation devices, one with and one without the aforementioned water envelope, may be utilized. A liquid component utilized in the dry film solder masking technique to fill voids and irregularities in the printed wiring board surface irradiated in this manner remains stable, preventing the overlaying film from cracking during a semi-curing step followed by further UV processing which provides a full cure. A lamp regulator permits smooth regulation of radiant energy while eliminating the need to regulate or change capacitors. A sensor monitors the UV lamp output to adjust and maintain the desired radiation operating levels.
REFERENCES:
patent: 3655173 (1972-04-01), Costello
patent: 3744557 (1973-07-01), Costello
patent: 3960081 (1976-06-01), Gustavs
patent: 4277518 (1981-07-01), Schillke
patent: 4695482 (1987-09-01), Weiswurm
patent: 4975300 (1990-12-01), Deviny
patent: 5040236 (1991-08-01), Costello
Argus International
Dang Vi Duong
Lusignan Michael
Weinstein Louis
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