Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Tetsuro Shimamura

Kazunari Nishihara

Yukinori Sasaki

Koji Nomura

Kazuo Fujiwara

Masako Yamaguchi

Kiyotomo Kubota

Hirohumi Tajika

Mikio Degawa

Katsu Takeda

Yuki Satoh

Katsunori Moritoki

Naoki Tatehata

Toru Sakuragawa

Hiroshi Tahara

Tetsuo Kawasaki

Yoshikazu Tsuru

Tetsuya Furihata

Takaaki Furumochi

Kanji Kato

Michael Hoeft

Koji Seo

Hiroshi Kushanti

Kuniaki Matsushita

Junji Ohishi

Sinji Itamochi

A multi-layered device includes an inductor electrode layer connected between one end of a first viahole inductor conductor and a side-surface ground electrode, and arranged substantially in parallel to a dielectric sheet, when the first and second viahole inductor conductors are arranged in such a positional relation that a distance between the first and second viahole inductor conductors is smaller than 1.5 times a length of the first viahole inductor conductor.

Multi-layered device and electronic equipment using thereof

Precise V-grooves allowing an optical fiber to project are formed in respective main surfaces of an upper plane substrate and a lower plane substrate. The optical fiber is mounted on one plane substrate, and a multi-layer film filteris inserted into a filter insertion groovecrossing the precise V-groove in the main surface of the other plane substrate. Then, using the projecting optical fiber and the other precise V-groove as a guide rail, two plane substrates grapple the multi-layer film filter to fix and mount the filter. In an optical filter module obtained in this manner, a process of adjusting an optical axis between input/output optical fibers is eliminated, and displacement of the inserted optical filter is reduced.

Optical filter module and manufacturing method thereof

A surface acoustic wave filter with little electromagnetic coupling between wires and improved attenuation characteristics is provided. This surface acoustic wave filter comprises: a package having a concavity in the shape of stairs made by laminating dielectrics, a surface acoustic wave element provided on the bottom face of the concavity, a plurality of wires for connecting between a plurality of electrodes provided on the surface of the surface acoustic wave element and a plurality of electrodes provided on one same plane portion of the stairs of the package in correspondence to a plurality of electrodes, and a dummy wire provided between the wires.

Surface acoustic wave filter

An optical filter module having a multilayered filter inserted in the paths of optical waveguides thereof. In the optical filter module, precise V-shaped grooves are formed on the principle plane of a plane substrate so that optical fibers protrude therefrom. The optical fibers are mounted on the plane substrate. After the multilayered filter is inserted in a filter insertion groove that is formed so as to intersect the V-shaped grooves on the plane substrate, the filter is sandwiched and clamped by two sheets of covers provided on the plane substrate. Provided is a method of precisely mounting the filter that improves the optical axis adjustment between input and output optical fibers and reduces misregistration of the filter to be inserted.

Optical filter module, and manufacturing method thereof

An optical filter module of the present invention has a flat substrate, an optical path formed on the flat substrate; a filter insertion groove provided, crossing the optical path, on the flat substrate; a multilayer filter inserted, dividing the optical path, into the filter insertion groove; and a pair of covers disposed on the flat substrate so as to sandwich the multilayer filter. The present invention enables the omission of the process of adjustment of the optical axis, thus achieving high operability. At the same time, the present invention ensures fixing and mounting of the multilayer filter even if the multilayer filter is warped.

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 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

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.

Piezoelectric vibrators

The invention is a crystal oscillator having a vibrating plate comprising a vibrating part surrounded by a rim part spaced from the vibrating part except for a narrow connecting part that connects the vibrating part to the rim part in a cantilever fashion. The thickness of the vibrating part and the connecting part are less than the thickness of the rim part. The vibrating part is sandwiched between a pair of casings. Each of the casings has a recess facing the vibrating part, which prevent the vibrating part from contacting the casings. Each surface facing a recess has an electrode positioned thereon and an electrode lead extending from the surface electrode to the connecting part. Each casing has a through-hole positioned to face an electrical lead. A cup-shaped metal lead is placed in each through-hole with the bottom of the cup contacting the electrical lead facing the through-hole. Current to the surface electrodes is supplied through the metal leads.

Growing community of inventors

Kyoto, Japan

Tetsuro Shimamura