Loading patent…
AssigneesSarnoff Corporation, Sharp Kabushiki Kaisha
InventorsEllen Schwartz Tormey, Ashok Narayan Prabhu, Attiganal Narayanaswamy Sreeram, Michael James Liberatore
Estimating the term…
Embedded passive components such as capacitors are formed in multilayer ceramic circuit boards by screen printing a component precursor compound ink sandwiched between conductor ink layers onto a green tape stack and covering the component ink layer with one or two green tape layers, aligning and laminating the green tapes and firing. Capacitor inks are made from dielectrics chosen from barium titanate, titanium oxide and lead-magnesium-niobate. The green tapes are made of a mixture of a crystallizing glass, a non-crystallizing glass and an oxide filler which does not shrink in the x and y dimensions during firing mounted on a metal support. Thus the embedded components can be made to close tolerances.
A capacitor ink comprising a dielectric selected from the group consisting of barium titanate, titanium oxide and lead-magnesium niobate, a low firing temperature glass that includes less than 2% of barium oxide and an organic vehicle in an amount sufficient to screen print the ink onto a ceramic green tape.
A multilayer ceramic green tape structure comprising a plurality of low firing temperature green tapes that do not shrink in the x and y dimensions during firing having circuit patterns thereon mounted on a metal support substrate, a capacitor layer screen printed on one of said green tape layers from a capacitor ink comprising a dielectric selected from the group consisting of barium titanate, titanium oxide and lead-magnesium-niobate, a low firing temperature glass that includes less than 2% of barium oxide, and an organic vehicle in sufficient amount to permit screen printing of the capacitor ink, one or two layers below the top green tape, and a silver conductor layer screen printed above and below the capacitor layer.
A supported ceramic circuit board including buried capacitors comprising:
A supported ceramic circuit board having buried capacitors comprising
Dependencies are inferred from the claim text.