Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Palo Alto Research Center Inc.

Panasonic Holdings Corporation

Yukinori Sasaki

Tetsuro Shimamura

Kazunari Nishihara

Koji Nomura

Masako Yamaguchi

Kiyotomo Kubota

Hirohumi Tajika

Tetsuyoshi Ogura

Ajay Raghavan

Katsu Takeda

Katsunori Moritoki

Akira Minegishi

Yosuke Tajika

Deokwoo Jung

Tetsuo Kawasaki

Fangzhou Cheng

Mamoru Ito

Tetsuya Furihata

Kuniaki Matsushita

One embodiment can provide a system for detecting anomaly for high-dimensional sensor data associated with one or more machines. During operation, the system can obtain sensor data from a set of sensor associated with one or machines, apply data exploration techniques on the sensor data to automatically process sensor data to identify a subset of feature sensors from the available set of feature sensors, apply an unsupervised machine-learning technique to the identified subset of feature sensors and the target sensor to learn a set of pair-wise univariate models, and determine whether and how an anomaly occurs in the operation of the one or more machines based on the set of pair-wise univariate models.

Method and system for unsupervised anomaly detection and accountability with majority voting for high-dimensional sensor data

A designing method for designing an electronic component aiming at increase in designing efficiency is provided. The designing method has a step of setting a predetermined electrical characteristic, a step of determining an electric constant of the component with a first electric circuit simulation to satisfy the predetermined electrical characteristic, a step of determining a pattern shape for obtaining the electric constant, a step of retrieving and selecting an electronic component matching with the electric constant from a database, and performing layout design using the selected electronic component as a module, a step of performing a second electric circuit simulation, and a step of determining whether the electrical characteristic of the module matches with the predetermined electrical characteristic.

Designing method for designing electronic component

A piezoelectric vibrator has a laminated structure where silicon oxide films having substantially the same thickness are disposed at both faces of piezoelectric plate as dielectric films. Using the structure discussed above, because dielectric films are formed at the both faces of the piezoelectric plate a difference of internal stress, which is caused by a difference of stress relaxation in a long term and affects the piezoelectric plate or the dielectric film, becomes small. Therefore, a warp can be considerably small. As a result, a change, which is caused by the warp of the piezoelectric vibrator, in a resonance frequency of the piezoelectric vibrator can be small.

Piezoelectric vibrator, filter using the same and its adjusting method

A piezoelectric oscillator using zinc oxide as a piezoelectric plate which eliminates unwanted resonance called inharmonic overtone by optimizing ratio Le/H of driving electrode length Le to oscillator thickness H. Ratio Le/H is set between 4 and 100 in the piezoelectric oscillator polarized in a thickness direction of a piezoelectric plate and using thickness extension vibration as main vibration or the piezoelectric oscillator polarized in a length direction of the piezoelectric plate and using thickness shear vibration as main vibration. This achieves stable characteristic because no unwanted resonance exists between the resonance frequency and anti-resonance frequency of the main vibration.

Piezoelectric vibration element and piezoelectric filter

A piezoelectric vibrator which uses lithium tantalate as a piezoelectric material and of which main vibration is thickness shear vibration. The thickness direction of the vibrator forms angle of 0&#xb0;&#xb1;5&#xb0; to the X-axis of a single crystal. The longitudinal direction of vibrator lies, with the X-axis used as a rotation axis, in direction n +57&#xb0;&#xb1;2&#xb0; clockwise from the Y-axis of the single crystal. A ratio L/H of the length L of the vibrator to the thickness H is not less than 15. A ratio Le/H of the length Le of the exciting electrode to the thickness H of the vibrator element portion is 3&#x2013;6. Accordingly, a vibrator having improved temperature characteristics and a large Q is realized.

Piezoelectric vibrator ladder-type filter using piezoeletric vibrator and double-mode piezolectric filter

A piezoelectric vibrator uses aluminum nitride as piezoelectric material and thickness sliding vibration as the primary vibration. A polarization direction of the primary vibration is along the longitudinal direction of its vibrating element. This vibrator eliminates undesired resonance, caused by a width of the vibrating element, from a vicinity of a resonance frequency of the primary vibration. Vibrating element has width W and thickness H defined as follows: 2.0&lE;W/H&lE;4.0 or 4.3&lE;W/H&lE;5.7 or 6.2&lE;W/H&lE;7.8 or 8.2&lE;W/H&lE;9.8.

Piezoelectric vibrator and filter using the same

A method for manufacturing a bimorph type piezoelectric element including a first step of providing a first piezoelectric single-crystal plate having a first surface and a second surface; a second step of providing a second piezoelectric single-crystal plate having a third surface and a fourth surface; a third step of directly bonding the third surface of the second piezoelectric single-crystal plate to the first surface of the first piezoelectric single-crystal plate without using any adhesives; a fourth step of forming a freely vibrating part by grinding away the second surface of the first piezoelectric single-crystal plate to a first depth and with a first spacing; and a fifth step of producing an element having a supporting member and the freely vibrating part by cutting the first piezoelectric single-crystal plate and second piezoelectric single-crystal plate with the freely vibrating part included, which have been prepared in the fourth step, with a predetermined spacing and at least in one of the directions of rows and columns.

Method for manufacturing a bimorph piezoelectric device for acceleration sensor

A piezoelectric vibration element comprises a vibration element part a vibration propagation part made of a same material with a greater thickness than the vibration element part a groove disposed in the boundary of the vibration element part and vibration propagation part excitation electrodes confronting the face side and back side of the vibration element part a connection electrode disposed in the vibration propagation part and an external lead-out electrode connected electrically to the connection electrode In this piezoelectric vibration element, the main vibration is the overtone mode, that is, when the lowest order wave mode is first-order or second-order, the wavelength in the thickness direction is (2n&plus;1) times (n being a natural number) thereof.

Piezoelectric vibration device

The present invention relates to a bimorph type piezoelectric acceleration sensor used in detecting vibrations of a variety of equipment such as a hard disk, CD-ROM and the like and has the objective of providing a bimorph type piezoelectric element for acceleration sensor of a small size, high sensitivity, a narrow range of sensitivity variation and a low cost by forming a freely vibrating part and a supporting means at the same time in single-piece construction through a grinding away process applied to lithium niobate. One section of a structure formed of two of a lithium niobate single-crystal plate directly bonded together with the polarization directions thereof reversed each other is applied with a grinding away process to produce a freely vibrating part (,) and the remaining section, where no grinding away process has been applied, serves as a supporting member (,), thus both being formed simultaneously and made integral with each other, and electrodes (,) are formed by electroless plating.

Bimorph piezoelectric device for acceleration sensor and method of its manufacture

A piezoelectric vibrator using thickness mode as the primary vibration and having a cross section of a bevel or convex configuration is provided which is superior in mechanical strength, easy to steadily mount, and has a small dispersion of characteristic. By employing a structure in which a vibrator,and a support section,are composed of the same material, the end portions of the vibrator section are integrated with the support section on the periphery of the vibrator, and the configuration of the cross section of the vibrator,is such that the thicknesses of the end portions of the vibrator are smaller than that of the central portion of the vibrator, a superior mechanical strength without chipping or cracking at the end portions of the vibrator is obtained allowing easy mounting while keeping the vibrator size small. The structure provides an added effect of a small dispersion of characteristic because the end portions of the vibrator are not exposed and the dispersion of the precision of working such as chipping and surface roughness at the end portions of the vibrator is small.

Growing community of inventors

Hyogo, Japan

Yukinori Sasaki