Casio Computer Co., Ltd.

Hitachi Metals, Ltd.

Casio Computer., Ltd.

Hitachi Ferrite Electronics, Ltd.

Soh Kimura

Takashi Sano

Junro Yano

Makoto Sawada

Narutoshi Minami

Tadashi Kotani

Syuuichi Machida

Kaoru Someya

Masahiro Mita

Kazuaki Abe

Hirokazu Araki

Takayuki Ishimoto

Syuuchi Machida

Someya Kaoru

Abe Kazuaki

A rotary switch includes an operating member, a magnet member, and a magnetic sensor. The operating member is operable from outside of a case to move to first and second positions in an axial direction and is rotatable. The magnet member is provided in such a manner that the magnet member does not move in the axial direction of the operating member. The magnetic sensor detects rotation of the magnet member. An engaging section is formed in a predetermined area of the operating member, and an engaging hole to receive the engaging section is formed in the magnet member. When the operating member is moved in the axial direction, the engaging section moves inside the engaging hole with the engaging section being engaged with the engaging hole, and when the operating member is rotated, the magnet member rotates therewith.

Rotary switch and electronic timepiece

A rotation switch includes an operating member that is operable to rotate, a magnet member that rotates integrally with the operating member, a magnetic sensor that is placed opposite to the magnet member, and a frame-shaped magnetic shield plate that surrounds the periphery of the magnetic sensor.

Rotation switch and electronic timepiece

A radio wave receiving device includes at least one magnetic drive unit and an antenna structure having a narrow core formed of magnetic material and a coil wound around the central part of the core. The device further includes two external magnetic members, each having a connecting part connected magnetically to one end part of the core. One magnetic member has a magnetism collecting part expanded in one side of the antenna structure from the connecting part to exclude the antenna structure, and the other magnetic member has a magnetism collecting part expanded in the other side of the antenna structure from the connecting part to exclude the antenna structure. These external magnetic members cover the drive unit in the both sides and shut off magnetic flux of external magnetic field from the both sides and collect magnetic flux of radio wave on the one end part of the core.

Radio wave receiving device with magnetic drive unit and antenna structure and electronic apparatus using the radio wave receiving device

In an antenna device of a wristwatch, a pair of external magnetic members each attached to a respective one of both ends of a magnetic core effectively collects the magnetic flux of a standard time and frequency signal. The collected magnetic flux passes through the core around which a coil is wound, thereby inducing an electromotive force and hence improving the reception accuracy of the signal. The pair of external magnetic members screens out undesirable external magnetism which would otherwise influence motors that drive a hand shaft and hands, thereby achieving accurate hand driving and improving the high watch accuracy.

Electronic apparatus and timepiece

In an electronic device having a metal device case, and an antenna disposed inside the device case, a magnetic member having a magnetic permeability higher than a magnetic permeability of the device case is placed between an inner surface of the device case and the antenna.

Electronic device and antenna apparatus

In one antenna unit, a non-electrically conductive resin layer is provided on a core portion of electrically conductive material and a winding portion is configured by a coil wound on the layer. The antenna unit is housed in a band attaching portion of a watch case of a watch, and a watch module is housed in the watch case. In another antenna unit, a core portion and a winding portion wound on the core portion are arranged in a cover case. Openings are formed in side walls of the cover case oppositely positioned to each other, and parts of the outer circumferential surface of the winding portion are arranged in the openings. The winding portion together with the core portion is supported to the inner surface of the cover case by adhesive portions interposed between the cover case and the winding portion.

Antenna unit and watch having the antenna unit

An antenna includes an elongate laminated core, a core case having an electrical insulating property and housing the core, and a coil wound around the core between both end portions of the core through the case. The core has a first and second groups, each including thin plates of amorphous soft magnetic alloy laminated with each other, and is configured by stacking the first and second groups one another. Each of the thin plates of the core includes flanges provided at both end portions thereof, and a coil wound portion between the both end portions, and the case includes projections, which push the both end portions of the thin plates of the second group to separate from the both end portions of the thin plates of the first group in the laminating direction of the thin plates of the core while the core is housed in the case.

Growing community of inventors

Kodaira, Japan

Soh Kimura