Other

Amiteq Co., Ltd.

Tdk Corporation

Casio Computer Co., Ltd.

Kabushiki Kaisha Sg

Atsutoshi Goto

Casio Computerco., Ltd.

Enprotech Corp.

Kazuya Sakamoto

Hiroshi Sakamoto

Nobuyuki Akatsu

Yasuhiro Yuasa

Daisuke Goto

Shuichi Tanaka

Akio Yamamoto

Tetsuya Hidaka

Yoshiaki Mochizuki

Kazuo Sato

Ryo Oe

Mitsuhiro Funatsu

Hironari Okada

Takeshi Sakamoto

Wataru Ichikawa

Koji Mitake

Tomomi Yamamoto

Yasuyuki Nakayama

Shinya Fujito

Motohisa Murata

Shoji Tozawa

Motoaki Hosako

Ronald D Fukui

Shuiti Tanaka

Hiroshi Sakamato

A portable communication terminal control system includes a plurality of first portable communication terminals and a second portable communication terminal. A first processor in the first portable communication terminal performs a first portable communication terminal side determination process which determines whether communication connection is in an established state between a first portable communication terminal and the second portable communication terminal. The first processor performs a transmission control process in which, in response to determination that the communication connection with the other first portable communication terminal is in the established state and that the communication connection with the second portable communication terminal is in the established state, a release signal is transmitted to the second portable communication terminal. The second portable communication terminal includes a second processor which, in response to receiving the release signal, shifts the second portable communication terminal to the released state.

Portable communication terminal control system, portable communication terminal and recording medium

A magnetically responsive member is disposed on a rotating member along the circumference of the rotating member in such a manner that the magnetically responsive member rotates together with the rotating member, and the magnetically responsive member is formed in a line-shaped pattern varying cyclically in a rotational axis direction. A stator is disposed around the rotating member in a contactless manner, and the stator includes a primary coil wound around the rotating member, and a secondary coil forming a loop pattern of a plurality of cycles along the circumference of the rotating member. As the primary coil is AC-energized, an induced AC output signal corresponding to relative positions between the line-shaped pattern of the rotating member and the loop pattern of the secondary coil, which depend on a rotational position of the rotating member, is output from the secondary coil.

Induction-type rotation detection device

Wearable electronic device

A wearable electronic device includes: a terminal main body part configured to execute predetermined processing; a first button for performing an operation input to the terminal main body part; and a wearable member configured to support the terminal main body part and the first button, and capable of being worn on a finger of a wearer. The first button is arranged on the wearable member such that, when the wearable member is worn, the first button is positioned on a nail side around a thumb of the wearer.

A wearable electronic device includes: an optical reader configured to read information; a wearable member to be worn so as to cover at least a part of a back of a hand and a finger; and a support part provided on a surface of the wearable member and configured to support the optical reader. The support part is formed to change a position of the optical reader during the wearable member being worn to at least two positions. The two positions are a fingertip-side and a back-side of a hand with respect to a boundary that is a third joint of the finger.

A device has a construction capable of promoting miniaturization, and comprises: a coil; a magnetism-responsive member disposed so as to be displaced relative to the coil according to a position of a detection object; and a self-oscillation circuit that incorporates the coil therein as an oscillation element so that an oscillation frequency varies with an inductance variation of the coil responsive to an displacement of the magnetism-responsive member relative to the coil. An arithmetic section generates a measured value responsive to oscillation frequency based on an oscillation output of the self-oscillation circuit, calculates velocity data by differentiating successive measured values, and calculates displacement data by integrating the velocity data. An offset error component caused by the peripheral temperature or a mechanical attachment position of the detection device can be automatically cancelled or reduced by the differential operation for calculating the velocity data, and precise displacement detection can be realized.

Displacement detection device

In a position detection device of a type that omits a secondary coil, various inconveniences arising from the use of a voltage-dividing resistance (fixed resistor) are eliminated. At least two pairs of coils are provided. A magnetism-responsive member are placed so as to effect relative displacement in relation to the coils, the relative position of the member in relation to the coils varies with a position of a detection object, and impedance of each coil is varied with the relative position. The impedance changes of two coils constituting each one of coil pairs present characteristics of mutually opposite phase characteristics. For each coil pair, the two coils constituting the pair are connected in series with each other, and from a connection point thereof, a voltage-divided output voltage according to the impedance of the two coils is taken out as a detection output signal for the pair.

Position detection device

A coil section includes a primary coil which is magnetically excitable by an AC signal, and secondary coils which are provided so as to generate an inductive output in response to excitation of the primary coil. A self-oscillation circuit, including an inductance element and a capacitor, has incorporated therein the primary coil as the inductance element for self-oscillation. A target section is provided in such a manner that its relative position to the coil section varies according to a position of a target of detection, and the target section includes a magnetically responsive member disposed so that inductance of the secondary coils is varied according to the relative position. Amplitude levels of the output signals of the secondary coils are extracted, and position data of the position of the target of detection is obtained on the basis of these amplitude levels.

Inductive position detection device

A detection coil incorporated in a self-oscillation circuit, which includes the coil and a capacitor and is set to a high frequency band (e.g., around 1 MHz or higher). A target section has a relative position to the coil section that varies in response to displacement of a detection object and includes a magnetism-responsive member constructed to cause inductance of the coil to vary with the relative position. A rectifier circuit extracts an amplitude level of an oscillation output signal of the self-oscillation circuit and outputs the extracted level as detected position data. For example, a plurality of self-oscillation circuits are provided. Alternatively, a single self-oscillation circuit forms a plurality of series circuits by, for each coil pair, connecting in series the two coils of the coil pair, and connecting the series circuits in parallel as an inductor element for self-oscillation.

A sintered rare earth magnet rotating machine and method improve temperature properties and strength having an excellent corrosion resistance. The sintered rare earth magnet includes at least a main phase composed of RTB (R represents at least one rare earth element of Nd, Pr or both and T represents at least one transition metal element including Fe or Fe and Co) compound and a grain boundary phase containing a higher proportion of R than the main phase, wherein the main phase includes a heavy rare earth element (one of Dy, Tb or both), at least part of main phase grains of the main phase included in the sintered rare earth magnet includes at least the following regions, low, high and intermediate concentration regions. These regions exist in order of low, high, and intermediate concentration regions, from low concentration region towards the grain boundary phase in the main phase grains.

Sintered rare earth magnet, method of producing the same, and rotating machine

A first sensor detects a rotational position of a first shaft in a noncontact fashion and generates a first output signal by phase-shifting a reference A.C. signal in accordance with the detected rotational position of the first shaft. A second sensor detects a rotational position of a second shaft in a noncontact fashion and generates a second output signal by phase-shifting the reference A.C. signal in accordance with the detected rotational position of the second shaft. First and second timing signals corresponding to phase shift amounts of the first and second output signals are output via respective output lines. Relative rotational position detection data, representing a rotational difference or amount of torsion between the two shafts, appears in a time difference between the first and second timing signals. A PWM signal, having a pulse width corresponding to a time difference between the first and second timing signals, may be output.

Relative rotational position detection apparatus

An R-T-B system permanent magnetcomprises a magnet bodycomprising a sintered body comprising at least a main phase comprising RTB grains (wherein R represents one or more rare earth elements, and T represents one or more transition metal elements including Fe or Fe and Co essentially) and a grain boundary phase containing R in a larger amount than the main phase, the magnet bodyhaving a 300 &#x3bc;m or less thick (not inclusive of zero thick) hydrogen-rich layerhaving a hydrogen concentration of 300 ppm or more formed in the surface layer portion, and an overcoatcovering the surface of the magnet bodycan improve the corrosion resistance of the R-T-B system permanent magnetwith an overcoatformed thereon without degrading the magnetic properties thereof. The present invention can be applied to formation of the overcoatby electrolytic plating, can fully ensure the corrosion resistance as a primary target of the overcoatformation without substantially degrading the production efficiency, and can provide the R-T-B system permanent magnetwith a high dimensional precision by suppressing the partial collapse (detachment of grains) of the surface thereof.

R-T-B system permanent magnet

First and second shafts () are interconnected via a torsion bar () for torsional (or rotational) movement relative to each other, and first and second magnetic body sections () are provided to rotate in interlocked relation to the rotation of the first and second shafts, respectively. The first and second magnetic body sections form at least two ring-shaped variable magnetic coupling sections opposed to each other via a gap, magnetic coupling in each of the boundary sections varies in response to variation of a relative rotational position between the first and second shafts, and variation of the magnetic coupling differs in phase between the boundary sections. Coil section () includes magnetic-coupling detecting coils (L-L) provided in corresponding relation to the boundary sections. Each of the first and second magnetic body sections is of a cylindrical shape and has a plurality of magnetic teeth formed at unequal pitches along the circumferential direction thereof, and the magnetic teeth differ in axial length among tooth groups corresponding to the boundary sections.

Relative rotational position detection apparatus having magnetic coupling boundary sections that form varying magnetic couplings

An R-T-B system rare earth permanent is provided, which comprises a sintered body comprising: an RTB phase (wherein R represents one or more rare earth elements (providing that the rare earth elements include Y) and T represents one or more transition metal elements essentially containing Fe, or Fe and Co) as a main phase; and a grain boundary phase containing a higher amount of R than the above main phase, wherein, when Pc (permeance coefficient) is 2, if a total flux is defined as funder the application of an effective magnetic field of 240 kA/m (providing that an effective magnetic field=an applied magnetic field&#x2212;a demagnetizing field, and each value of them is absolute value), if a total flux is defined as funder the application of an effective magnetic field of 800 kA/m, and if a total flux is defined as funder the application of an effective magnetic field of 2,000 kA/m, a magnetization rate a (=f/f&#xd7;100) is 40% or more, and a magnetization rate b (=f/f&#xd7;100) is 90% or more.

R-T-B system rare earth permanent magnet

Two A.C. output signals amplitude-modulated in accordance with two function values (sine and cosine) differing from each other in correspondence to a position-to-be-detected are received from a position sensor such as a resolver. By performing an addition or subtraction between a signal derived by shifting the electric phase of one of the received A.C. output signals by a predetermined angle, and the other received signal, two electric A.C. signals (sin(&#x3c9;t&#xb1;d+&#x3b8;), sin((&#x3c9;t&#xb1;d&#x2212;&#x3b8;)) are electrically synthesized which have electric phase angles (&#x3b8;) corresponding to the position-to-be-detected and are phase-shifted in opposite directions. '&#xb1;d' here represents phase variation error caused by factors, other than the position-to-be-detected, such as temperature change. In the synthesized two signals, the phase variation errors (&#xb1;d) appear in the same direction, while the phase differences (&#x3b8;) corresponding to the position are shifted in opposite, positive and negative, directions. Thus, by measuring the respective phase shift amounts (&#xb1;d+&#x3b8;, &#xb1;d&#x2212;&#x3b8;) and performing appropriate operation, it is allowed to cancel out or extract the error (&#xb1;d) so that an accurate phase difference (&#x3b8;) can be detected. Position detection data indicative of the detected phase difference (&#x3b8;) is converted into a pulse-width-modulated signal and transmitted in the pulse-width-modulated form.

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Hamura, Japan

Kazuya Sakamoto