Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1992-07-31
1994-05-17
Ryan, Patrick J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428209, 501 17, 501 32, 252 62, B32B 900
Patent
active
053126742
ABSTRACT:
A ferromagnetic material (18,20) in ink or tape form is sinterable using a same firing profile as and has approximately the same thermal shrinkage characteristics as low-temperature-cofired-ceramic (LTCC) tape, and is chemically non-reactive therewith. The ferromagnetic material (18,20) is applied to the surfaces of LTCC tape sheets (12,14,16) to form desired elements such as cores for inductors (22) and transformers and magnetic shields. Ferromagnetic vertical interconnects (vias) (54) can be formed by punching holes (56) through tape sheets (46) and filling them with ferromagnetic ink. The tape sheets (12,14,16) and ferromagnetic elements (18,20) are laminated together and cofired to form an integral structure (10). Ferromagnetic and non-magnetic components (114) can be fabricated separately and inserted into cavities (104a, 106a,108a) in tape sheets (104,106,108) prior to cofiring. A multi-layer transformer (250) includes primary (254b, 256b,258b,254d,256d,258d) and secondary (254c,256c,258c) coils, each being formed of vertically aligned, arcuate conductors which are printed on separate tape sheets (254,256,258) and vertically interconnected at their ends to form continuous electrical paths therethrough.
REFERENCES:
patent: 4360441 (1982-11-01), Borrelli et al.
patent: 4396682 (1983-08-01), Mohri et al.
patent: 4857486 (1989-08-01), Ebata et al.
patent: 4991283 (1991-02-01), Johnson et al.
patent: 5028473 (1991-07-01), Vitriol et al.
"Development of a Low Temperature Cofired Multilayer Ceramic Technology", by William Vitriol et al., ISHM Proceedings 1983, pp. 593-598.
Gonzalez Carlos H.
Goodman Charles A.
Haertling Carol
Lusher David M.
McClanahan Robert F.
Denson-Low W. K.
Gudmestad Terje
Hughes Aircraft Company
Lee Cathy
Leitereg Elizabeth E.
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