SOLDER RESIST OPENING STRUCTURE AND CIRCUIT BOARD
A solder resist opening structure that exposes an electrode pad through a solder resist opening. The solder resist opening has a bottom diameter of about 80 μm or less with a first tolerance less than about 2.5 μm, the bottom diameter being smaller than a diameter of the electrode pad; an inverted t...
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Zusammenfassung: | A solder resist opening structure that exposes an electrode pad through a solder resist opening. The solder resist opening has a bottom diameter of about 80 μm or less with a first tolerance less than about 2.5 μm, the bottom diameter being smaller than a diameter of the electrode pad; an inverted trapezoidal cross section with a top diameter larger than the bottom diameter; and a diameter difference between the top diameter and the bottom diameter of about 10 μm or more with a second tolerance less than about 2.5 μm |
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