Alps Electric Co., Ltd.

Kazuaki Kaneko

Satoshi Waga

Takashi Sato

Kyosuke Ozaki

Takeshi Ikeda

Haruhiko Fujimoto

Takuo Kudo

Yutaka Matsuo

Hideto Ando

Tsutomu Takeya

Masayuki Obana

A magnetic field component in a Z direction is guided by a magnetic field guide layer and applied to a magnetic sensor in an X direction that is the same as a sensitivity axis direction thereof, and a detection output is obtained. A bridge circuit is formed with a plurality of magnetic sensors and configured such that an output is not provided for a magnetic field component in the X direction. However, when an external magnetic field in the X direction is drawn to the magnetic field guide layer, variation of sensitivity for the X direction may occur. Thus, soft magnetic characteristics of a first portion of the magnetic field guide layer are deteriorated to decrease the magnetic permeability of the first portion.

Magnetic detection device

A surface acoustic wave device includes a piezoelectric substrate and an electrode section, disposed on the piezoelectric substrate, having a thin-film structure. The electrode section includes interdigital electrodes and junction electrodes connected to the interdigital electrodes. The interdigital electrodes each include corresponding first base layers containing Ta and Cu layers or Cu&#x2014;M alloy layers each disposed on the corresponding first base layers, wherein M represents one or more elements selected from the group consisting of Ag, Sn, and C.

Surface acoustic wave device having high dielectric strength and process for manufacturing the same

IDT electrodes are formed by a Cu alloy. When the wavelength of a SAW propagating in the direction of the X axis of a piezoelectric substrate is indicated by &#x3bb;, and when the thickness of the IDT electrodes is indicated by H, the standardized thickness H/&#x3bb; of the IDT electrodes ranges from 0.045 to 0.070, and the piezoelectric substrate is a rotated Y-cut LiTaOsubstrate whose rotational cut angle &#x3b8; from the Y axis to the Z axis around the X axis ranges from 52.0&#xb0; to 58.0&#xb0;. With this arrangement, the reflection coefficient S11 becomes 0.88 or higher.

Surface acoustic wave device suitable for use in GHz band

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Niigata-ken, Japan

Kazuaki Kaneko