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Thin-film-magnetic-head-with-a-coil-having-a-trapezoidal-crosssection

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Thin-film magnetic head with a coil having a trapezoidal crosssection

Details

Inventors: Fujita, Kiyoharu; Sasaki, Takeo; Furuichi, Shinji;
Assignee: Hitachi Metals, Ltd. (Tokyo, JP)
Primary Examiner: Heinz; A. J.
Assistant Examiner:
Attorney, Agent or Firm:

A coil construction of a thin film magnetic head that can be manufactured with high yields without forming cavities between the coil layers while preventing short-circuiting between the upper magnetic pole and the coil layers is disclosed. The thin film magnetic head has a recording gap layer provided at the tips of film-shaped lower and upper magnetic poles magnetically connected in the rear portion thereof, and one or more coil layers wound around the rear portion; the coil layers having a convexedly curved upper surface and sides whose inclination angle .theta. is within the range of 80.degree. to 90.degree..

DETAILED DESCRIPTION It is an object of the present invention to provide a thin film magnetic head having coils that can ensure insulation between layers and insulation between coil conductors even after miniaturized.
A thin film magnetic head according to the present invention comprises a lower magnetic core and an upper magnetic core provided via a non-magnetic thin film that serves as a magnetic gap, and at least one layer of thin film coil insulated by an insulating resin layer that covers the thin film coil between these magnetic cores.
The thin film coil consists of thin film conductors wound on the magnetic core.
One end each of the lower and upper magnetic cores is disposed facing each other via a magnetic gap, serving as a recording magnetic pole.
The lower and upper magnetic cores have a mutually connected portion on an area other than the respective magnetic poles thereof; forming a magnetic path running from one magnetic pole, passing through the magnetic core having that magnetic pole, via the mutually connected portion, passing through the other magnetic core, to the other magnetic pole on the other magnetic core.
Among the thin film coil, the thin film conductors constituting at least the lowermost coil layer that is closest to the lower magnetic core have a trapezoidal cross section that tapers off from the lower magnetic core upward, with the sides of the trapezoidal conductor inclined 80 to 90 degrees inward with respect to the upper surface of the lower magnetic core, and the upper surface of the thin film conductor curved convexedly.
The thin film magnetic head according to the present invention may comprise a plurality of layers of thin film coils comprising layers of thin film conductors wound on the magnetic core.
The thin film conductors have a trapezoidal cross section that tapers off from the portion near the lower magnetic core upward, with the sides of the trapezoidal conductors inclined 80 to 90.
degree.
inward with respect to the upper surface of the lower magnetic core

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