Padless high density circuit board and manufacturing method thereof
First Claim
1. A padless high density circuit board, comprising:
- a circuit board substrate having a dielectric layer on its surface;
external wiring, having a plurality of external terminals with a width as large as or less than the external wiring, formed on the dielectric layer;
a solder mask over the dielectric layer and the external wiring with a plurality of solder mask openings exposing the external terminals, with diameters at least as large as the widths of the external terminals exposed thereby; and
a plurality of conductive bumps formed on the external terminals exposed by the solder mask openings for connection with an external device in a subsequent assembly process.
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Accused Products
Abstract
A padless high density circuit board and manufacturing method thereof. The method includes providing a circuit board substrate having a dielectric layer on a surface, forming external wiring, having a plurality of external terminals with a width as large as or less than the external wiring on the dielectric layer, forming a solder mask over the dielectric layer and the external wiring with a plurality of solder mask openings exposing the external terminals, with diameters at least as large as the widths of the external terminals exposed thereby, and forming a plurality of conductive bumps on the external terminals exposed by the solder mask openings for connection with an external device in a subsequent assembly process.
184 Citations
19 Claims
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1. A padless high density circuit board, comprising:
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a circuit board substrate having a dielectric layer on its surface;
external wiring, having a plurality of external terminals with a width as large as or less than the external wiring, formed on the dielectric layer;
a solder mask over the dielectric layer and the external wiring with a plurality of solder mask openings exposing the external terminals, with diameters at least as large as the widths of the external terminals exposed thereby; and
a plurality of conductive bumps formed on the external terminals exposed by the solder mask openings for connection with an external device in a subsequent assembly process. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A padless high density circuit board for connection with an external device with a bump or lead, comprising:
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a circuit board substrate having a dielectric layer on a surface;
external wiring, having a plurality of external terminals with a width as large as or less than the external wiring, formed on the dielectric layer;
a solder mask over the dielectric layer and the external wiring with a plurality of solder mask openings exposing the external terminals, with diameters at least as large as the widths of the external terminals exposed thereby; and
a plurality of conductive bumps, not higher than the solder mask, formed on the external terminals exposed by the solder mask openings. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A padless high density circuit board for connection with an external device without a bump or lead, comprising:
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a circuit board substrate having a dielectric layer on a surface;
external wiring, having a plurality of external terminals with a width as large as or less than the external wiring, formed on the dielectric layer;
a solder mask over the dielectric layer and the external wiring with a plurality of solder mask openings exposing the external terminals, with diameters at least as large as the widths of the external terminals exposed thereby; and
a plurality of conductive bumps, about 20 μ
m to 60 μ
m higher than the solder mask, formed on the external terminals exposed by the solder mask openings.
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Specification