Planar coil element and method for producing planar coil element
AssigneeSumitomo Electric Printed Circuits, Inc.
InventorsHiroshi Ueda, Kousuke Miura, Yoshihito Yamaguchi, Yuka Urabe
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Abstract
A planar coil element of the present invention includes an insulating base film having a first surface and a second surface opposite to the first surface, a first conductive pattern deposited on the first surface side of the insulating base film, and a first insulating layer covering the first conductive pattern on the first surface side, in which the first conductive pattern includes a core body and a widening layer deposited by plating on the outer surface of the core body, and the ratio of the average thickness of the first conductive pattern to the average circuit pitch of the first conductive pattern is ½ or more and 5 or less.
Claims9
A planar coil element comprising an insulating base film having a first surface and a second surface opposite to the first surface, a first conductive pattern deposited on the first surface side of the insulating base film, and a first insulating layer covering the first conductive pattern on the first surface side,
- wherein the first conductive pattern includes a core body and a widening layer deposited on an outer surface of the core body,
- a ratio of an average thickness of the first conductive pattern to an average circuit pitch of the first conductive pattern is ½ to 5,
- the first conductive pattern includes a rectangular portion that is deposited on the first surface side of the insulating base film and that has a rectangular cross-sectional shape, and a top portion that extends continuously from a surface of the rectangular portion opposite to the surface on which the insulating base film lies and that has a cross section with a semicircular shape, and
- an average shortest distance from the top portion of the first conductive pattern to a surface of the first insulating layer on the first surface side of the insulating base film is 3 μm to 40 μm.
Dependencies are inferred from the claim text.