Coating processes – Direct application of electrical – magnetic – wave – or... – Pretreatment of substrate or post-treatment of coated substrate
Patent
1996-11-08
1998-03-24
Beck, Shrive P.
Coating processes
Direct application of electrical, magnetic, wave, or...
Pretreatment of substrate or post-treatment of coated substrate
427554, 427556, 427532, 427 58, 427 96, 427271, 216 17, 216 94, 2191217, 21912171, B05D 302, C08J 718
Patent
active
057310475
ABSTRACT:
A method of forming a blind-via in a laminated substrate by forming a first conductive layer. A dielectric layer is then formed on the first conductive layer. An exposed second conductive layer is formed on the dielectric layer, with the second conductive layer having a preformed aperture. The dielectric layer is laser drilled through to the first conductive layer to form a blind-via at a location within the preformed aperture of the second conductive layer using a plurality of laser pulses. Each laser pulse has a first energy density per pulse that is greater than an ablation threshold of the dielectric layer and less than an ablation threshold of the first conductive layer. The first conductive layer is then laser drilled for a predetermined number of pulses. Each of the predetermined number of pulses has a second energy density per pulse that is greater than an ablation threshold of the first conductive layer. The predetermined number of pulses cause the surface of the first conductive layer exposed by the laser drilling to become molten.
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Lizotte et al., "Laser Drilling Speeds BGA Packaging", Solid State Technology, pp. 120-128, Sep.1996.
Barr Michael
Beck Shrive P.
Genco, Jr. Victor M.
W.L. Gore & Associates, Inc.
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