Electronic circuit board flat coil inductor

Claim 1

A flat coil inductor for electronic circuit boards, comprising: a circuit board having first and second spaced, generally flat electrically insulated surfaces, at least a first and a second series of holes extending along said surfaces and extending through said board, said first series of holes being generally parallel to said second series of holes, a first conductive pattern applied to a first surface of said board and comprising a first series of straps connecting between said first and second series of holes, a second conductive pattern applied to said second surface of said board and comprising a second series of straps extending between said first and second series of holes, a conductive layer on at least a portion of the walls of said holes, said conductive layer completing an electrical circuit through said straps and holes forming at least one generally helical pattern, conductive paths surrounding said holes, the axis of said helix is between and parallel to said first and second series of holes, individual holes in said series of holes are in a staggered pattern, alternate holes being spaced closer to and further from said axis, on one of said surfaces said straps alternately extend between the more closely spaced pairs of holes, on the other of said surfaces said straps extend between equally spaced but alternately staggered pairs of holes.