Sanyo Electric Co., Ltd.

Fumio Kameoka

Takashi Ogura

Isao Tanaka

Kenichi Ezaki

Kazuo Ino

Jyoichi Tamada

Kouzo Ishihara

Masami Ikeda

Hiroyuki Okuda

Naoki Tanaka

Kazuya Niki

Masanori Hongo

Satoru Ota

Atsushi Inoue

Yoshifumi Fukumoto

Hiroyasu Egashira

Horiyuki Okuda

Electric circuit device comprises electric element and two conductive plates. The electric element includes two anode electrodes and two cathode electrodes and has relatively low impedance in a frequency range between 1&#xd7;10&#x2212;5 to 10 GHz. The one conductive plate has lower impedance than that of the conductive plate comprising the electric element and is connected between two anode electrodes. The other conductive plate has lower impedance than that of the conductive plate comprising the electric element and is connected between two cathode electrodes. As a result, the electric circuit device which has relatively low impedance and is capable of preventing the temperature rise is provided.

Electric circuit device

A surface acoustic wave device including, as formed on a piezoelectric substrate, one or a plurality of resonators connected together, each of the resonators comprising an interdigital transducer and a grating reflector, the object of the invention is to compact the device by improving the reflection efficiency of the grating reflector. When the grating reflector is a metal strip array reflector of the open type, the grating reflector has an electrode occupancy ratio of 0.7 to 0.8. Alternatively, when a metal strip array reflector of the short-circuit type is used, the grating reflector has an electrode occupancy ratio of 0.45 to 0.55, or when a metal strip array reflector of the interdigital type is used, the grating reflector has an electrode occupancy ratio of 0.7 to 0.85.

Surface acoustic wave device

A slider body and a yoke each made of a ferromagnetic oxide are butted against each other with a gap spacer provided therebetween. An air bearing portion is formed on the upper surface of the slider body. The yoke has a width t smaller than the width w of the air bearing portion, and is covered over both side faces thereof with glass and bonded to the slider body with the glass.

Magnetic head slider

A parallel type MIG (Metal in Gap) magnetic head includes single-crystal ferrite core halves with a thin ferromagnetic film formed on the gap-forming face of at least one of the core halves. The core halves are joined together using a glass having an Fe content in the range of 2-13 at %. The crystalline geometry of the principal magnetic path forming faces and gap forming faces of the core halves is selected to minimize the pseudo-gap problem and to improve reproduction output.

MIG magnetic head structured to minimize pseudo-gap problem

With a view to solving the problem of 'pseudo-gap' in a parallel type MIG head and to improving its reproduction output, effective combinations of the principal magnetic path forming face and the gap-forming face were determined empirically for the case of using a single-crystal ferrite core material. The improved magnetic head comprises a pair of magnetic core halves made of a single-crystal ferrite, at least one of said magnetic core halves having a thin ferromagnetic metal film formed on the gap-forming face, and said thin ferromagnetic metal film abutting against the other magnetic core half with a non-magnetic material being interposed to form a magnetic gap, the improvement wherein the principal magnetic path forming face of the magnetic core half provided with said thin ferromagnetic metal film has a crystal plane generally designated {211} whereas a vector A that is parallel to the &lt;110&gt; crystal axis in said principal magnetic path forming face and that is directed away from the gap-forming face forms an angle .theta. of the range 0.degree.-60.degree. or 150.degree.-180.degree. with a vector B that is parallel to the intersection of the principal magnetic path forming face and the gap-forming face and that approaches the face opposite to a recording medium.

Magnetic head having a single-crystal ferrite core

Growing community of inventors

Osakashi, Japan

Fumio Kameoka