The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 04, 2003
Filed:
Nov. 01, 2000
Kazuyoshi Ishii, Tokyo, JP;
Kozo Yoshida, Fuji, JP;
Other;
Abstract
In a flat magnetic head coil constituted by spiral coil patterns made of a conductive material film and two terminals connected to the coil patterns, the coil patterns have a substantially rectangular sectional shape. A minimum pitch P [&mgr;m] of the coil pattern, a width W [&mgr;m] of the sectional shape at the minimum pitch P, and a height H [&mgr;m] satisfy 15 [&mgr;m]≦P≦70 [&mgr;m] and 1.8−0.012P≦H/W≦7.5−0.06P. When an impedance Z between the two terminals of the coil while a core made of a magnetic material is not attached is equivalently constituted by an inductance L an RF resistance Rp parallel to the inductance L and a DC resistance Rs which is series-connected to the inductance L and is independent of a frequency, the inductance L [&mgr;H] at 10 MHz satisfies L ≦0.85 [&mgr;H].