Inductor devices – With coil or magnetic material
Patent
1995-10-11
1996-07-02
Kozma, Thomas J.
Inductor devices
With coil or magnetic material
336183, 336200, 336232, 336233, H01F 1704, H01F 2730
Patent
active
055326676
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: 3483499 (1969-12-01), Lugten
patent: 3765082 (1973-10-01), Zyetz
patent: 3833872 (1974-09-01), Marcus et al.
patent: 4117588 (1978-10-01), Johnson
Gonzalez Carlos H.
Goodman Charles A.
Haertling Carol
Lusher David M.
McClanahan Robert F.
Denson-Low W. K.
Hughes Aircraft Company
Kozma Thomas J.
Lachman M. E.
Sales M. W.
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