Mitsumi Electric Company Ltd.

Nippon Hoso' Kyokai

Yasuhiko Shinjo

Akira Nakamura

Toshihiro Uehara

Kenji Machida

Junji Numazawa

Naoto Hayashi

Morio Kondo

Kazutoshi Mutou

Satoshi Ajiki

Norio Hasegawa

Koichi Hosoya

Tsuyoshi Ishii

The object of the present invention is to provide a magnetoresistive magnetic head having good, stable playback characteristics. In an MR head wherein an MR element is interposed between a lower shield layer and an upper shield layer, separated by non-magnetic layers. The lower shield layer and the upper shield layer are formed from a material having high permeability and high resistivity. Since the magnetic shield layers are formed from materials having high permeability and high resistivity, even if friction causes dragging of the head surface, there is effectively no short circuit between the magnetic shield layer and the magnetic element.

Magnetic head

A magnetic head device having excellent sliding contact between its slider surface and magnetic tape at the time of scanning is provided. This magnetic head device has a base member, a thin-film magnetic head formed in contact with the base member and accommodated in a non-magnetic layer with the top end of a magnetic gap being exposed, and an auxiliary member which sandwiches the non-magnetic layer between the auxiliary member and the base member. On the top ends of the base member, the non-magnetic layer, and the auxiliary member, a slider surface on which magnetic tape slides is formed in the aligning direction of the base member, the non-magnetic layer, and the auxiliary member, or in a direction inclined at a predetermined angle to the aligning direction. Accordingly, the non-magnetic layer can be made thin, and the area of the non-magnetic layer on the slider surface is small. Thus, the space between the magnetic head device and the magnetic tape can be made small, and the sliding contact of the magnetic head device can be improved.

Magnetic head device with a short auxiliary member

A non-magnetic layer is laminated on a lower magnetic layer. A first upper magnetic layer is formed on the non-magnetic layer so as to form a magnetic core together with the lower magnetic layer and the non-magnetic layer. The first upper magnetic layer has a first saturation magnetic flux density and a first magnetostriction constant. An insulation layer is formed on the non-magnetic layer. A thin film coil is provided in the insulation layer. A second upper magnetic layer is formed on the insulation layer so as to be at least above the thin film coil. The second upper magnetic layer has a second saturation magnetic flux density and a second magnetostriction constant. The first saturation magnetic flux density is higher than the second saturation magnetic flux density. The second magnetostriction constant is lower than the first magnetostriction constant.

Thin film magnetic head and method of manufacturing the same

A pattern of lead terminals is formed on a side face of a head body provided with reproduction magnetic heads each being formed with a magnetic gap for reproducing at least an information signal, etc., recorded on a magnetic recording medium, and a preamplifier for amplifying reproduction output detected by the magnetic gap via the lead terminal is mounted directly on the side face of the head body

Magnetic head unit

A magneto-resistive thin film magnetic head is provided, which magnetic head includes: a base; a first yoke provided on the base and separated by a gap into first and second portions, the first portion including a side which opposes a magnetic recording medium; a magneto-resistive element which is magnetically coupled to the first and second portions of the first yoke and detects a magnetic recording signal; a second yoke formed on the first yoke so as to form a reproducing head gap between the first portion of the first yoke and the second yoke; and a third yoke provided between the first portion of the first yoke and the base so as to be magnetically coupled to the first portion of the first yoke. The reproducing head gap, the first portion of the first yoke, the magneto-resistive element, the second portion of the first yoke, ad the second yoke form a cut magnetic circuit.

Growing community of inventors

Atsugi, Japan

Yasuhiko Shinjo