Multilayered inductor
First Claim
1. A multilayer inductor comprising:
- a plurality of integrally stacked magnetic material sheets, each one of said plurality of integrally stacked magnetic material sheets having a conductor pattern with an extreme lead-out portion and a dummy conductor pattern spaced apart from said conductor pattern and disposed in substantial registry with said extreme lead-out portion formed on an upper surface thereof;
a through-hole formed completely through each one of said plurality of integrally stacked magnetic material sheets except a bottom one of said plurality of integrally stacked magnetic material sheets, said through-hole being formed at a position where said conductor patterns formed on surfaces of each one of said integrally stacked magnetic material sheets are vertically aligned and being filled with a conductive material that contacts said conductor patterns formed on surfaces of each one of said plurality of integrally stacked magnetic material sheets; and
external electrodes connected to said extreme lead-out portion of each one of said conductor patterns.
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Accused Products
Abstract
A multilayer inductor 1 is fabricated, for example, by sandwiching a first magnetic material sheet (21) between a second magnetic material sheet (22) and a third magnetic material sheet (23) and integrating the three layers. The first magnetic material sheet (21) is preferably at least 0.2 mm thick and has a first spiral conductor pattern (31) having an extreme lead-out portion (310) formed on its upper major surface. The first sheet (21) is provided with a through-hole (4) extending between the opposed major surfaces and having a larger diameter on the conductor pattern bearing surface. The through-hole (4) is filled with a conductor (35) contiguous to the first conductor pattern (31). The second magnetic material sheet (22) has a second spiral conductor pattern (32) having an extreme lead-out portion (320) formed on its upper major surface and connected to the conductor (35) in the through-hole (4). The magnetic material sheets (21, 22) on their major surfaces having the first and second conductor patterns (31, 32) formed thereon are provided with dummy conductor patterns (61, 65) which are spaced from and opposed to the extreme lead-out portions (310, 320), respectively, and external electrodes are connected. Benefits include easy fabrication, safe connection, least property variation, improved manufacturing yield and reliability.
114 Citations
14 Claims
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1. A multilayer inductor comprising:
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a plurality of integrally stacked magnetic material sheets, each one of said plurality of integrally stacked magnetic material sheets having a conductor pattern with an extreme lead-out portion and a dummy conductor pattern spaced apart from said conductor pattern and disposed in substantial registry with said extreme lead-out portion formed on an upper surface thereof; a through-hole formed completely through each one of said plurality of integrally stacked magnetic material sheets except a bottom one of said plurality of integrally stacked magnetic material sheets, said through-hole being formed at a position where said conductor patterns formed on surfaces of each one of said integrally stacked magnetic material sheets are vertically aligned and being filled with a conductive material that contacts said conductor patterns formed on surfaces of each one of said plurality of integrally stacked magnetic material sheets; and external electrodes connected to said extreme lead-out portion of each one of said conductor patterns. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A multilayer inductor comprising:
- a plurality of integrally stacked magnetic material sheets, each one of said plurality of integrally stacked magnetic material sheets having a conductor pattern with an extreme lead-out portion formed on an upper surface thereof and having a thickness of at least 0.2 millimeters;
a through-hole formed completely through each of said plurality of integrally stacked magnetic material sheets except a bottom one of said plurality of integrally stacked magnetic material sheets, said through-hole being formed at a position where said conductor patterns formed on surfaces of each one of said integrally stacked magnetic material sheets are vertically aligned and being filled with a conductive material that contacts said conductor patterns formed on surfaces of each one of said plurality of integrally stacked magnetic material sheets; external electrodes connected to said extreme lead-out portion of each one of said conductor patterns; and pads located at points of connection between each one of said conductor patterns and said conductive material filling said through-hole, said pads being wider than a pattern width of each one of said conductor patterns. - View Dependent Claims (9, 10, 11, 12, 13, 14)
- a plurality of integrally stacked magnetic material sheets, each one of said plurality of integrally stacked magnetic material sheets having a conductor pattern with an extreme lead-out portion formed on an upper surface thereof and having a thickness of at least 0.2 millimeters;
Specification