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Author

Eturo Yasuda

Bio: Eturo Yasuda is an academic researcher. The author has contributed to research in topics: Piezoelectricity & Distortion. The author has an hindex of 3, co-authored 5 publications receiving 64 citations.

Papers
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Patent
18 Jun 1984
TL;DR: In this paper, an actuator for injecting fuel into an automobile at a high speed and a delicate response to external operation is provided by selecting the ratio of the number of the piezoelectric elements having the positive and negative temperature dependencies.
Abstract: A piezoelectric transducer comprising a lamination of piezoelectric elements including one or more elements in which the distortion has a positive temperature dependency and one or more elements in which the distortion has a negative temperature dependency. By selecting the ratio of the number of the piezoelectric elements having the positive and negative temperature dependencies, the temperature dependency of the distortion of a transducer can be eliminated. An actuator for injecting fuel into an automobile at a high speed and delicate response to external operation is provided.

38 citations

Patent
25 Nov 1986
TL;DR: In this article, a piezoelectric laminate stack with a plurality of metal plates was constructed, and the metal plates were formed with at least two projections on the periphery of the stack.
Abstract: A piezoelectric laminate stack having a plurality of piezoelectric plates manufactured of a piezoelectric element, and a plurality of metal plates. The metal plates have approximately the same shape as the piezoelectric plates, and are formed with at least two projections, respectively, on the periphery thereof. The length of the projections is greater than the thickness of the piezoelectric plates. The piezoelectric plates and the metal plates are alternately stacked. The projections of a first group of metal plates are located at angular positions different to angular positions of the projections of a second group of metal plates. The projections are bent in a direction along the axis of the laminate stack in such a manner that the first group of metal plates are electrically connected together and the second group of the metal plates are electrically connected together.

18 citations

Patent
05 Dec 1984
TL;DR: In this article, a ternary fundamental solid solution of 0.5 to 5.0 mole % of Pb(Y 1/2Nb1/2)03 was described.
Abstract: TITLE OF THE INVENTION PIEZOELECTRIC CERAMIC MATERIALS ABSTRACT OF THE DISCLOSURE Piezoelectric ceramic materials comprising a ternary fundamental solid solution of 0.5 to 5.0 mole % of Pb(Y1/2Nb1/2)03, 40.0 to 50.0 mol % of PbTiO3, and 45.0 to 59.5 mol % of PbZrO3 are described. In the ceramic materials, part of Pb in the solid solution is substituted with 10.0 to 15.0 mol % of Sr, and at least one member selected from the group consisting of Nb2O5, WO3, La2O3, Bi2O3, Tb4O7, NdO and Pr6O11 is further contained in the solid solution in an amount of 0.1 to 2.0 wt.% of the solid solution.

7 citations

Patent
05 Dec 1984

1 citations

Patent
05 Dec 1984
TL;DR: In this article, the authors present a proposal for an extension of the solution-solide framework in the context of the FONDAMENTALE TERNAIRE (Fondation Nationale Ternaire) conference.
Abstract: LA PRESENTE INVENTION DECRIT DES MATERIAUX POUR CERAMIQUES PIEZOELECTRIQUES QUI COMPRENNENT UNE SOLUTION SOLIDE FONDAMENTALE TERNAIRE DE 0,5 A 5,0 EN MOLE DE PB(YNB)O, DE 40,0 A 50,0 EN MOLE DE PBTIO, ET DE 45,0 A 59,5 EN MOLE DE PBZRO. DANS LES MATERIAUX CERAMIQUES, UNE PARTIE DU PLOMB DE LA SOLUTION SOLIDE EST REMPLACEE PAR 5,0 A 15,0 EN MOLE DE SR, ET AU MOINS UN ELEMENT CHOISI DANS LE GROUPE CONSTITUE DE NBO, WO, LAO, TAO, BIO, TBO, NDO ET PRO EST D'AUTRE PART INCORPORE DANS LA SOLUTION SOLIDE SUIVANT UNE QUANTITE DE 0,1 A 2,0 EN POIDS DE LA SOLUTION SOLIDE. APPLICATION AUX ACTIONNEURS POUR ELEMENTS DE CIRCUIT OU ELEMENTS TRANSDUCTEURS ULTRASONIQUES.

Cited by
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PatentDOI
TL;DR: A vibration wave device having a resilient member and electro-mechanical energy conversion means for inducing a travelling vibration wave in the resilient member, the traveling vibration wave being used as a drive source, includes means provided on at least one member of the vibrational wave device at a location integer times or approximately integer times 1/2 of the wavelength of a vibration wave which may produce noise and making the dynamic rigidity of the member non-uniform.
Abstract: A vibration wave device having a resilient member, and electro-mechanical energy conversion means for inducing a travelling vibration wave in the resilient member, the travelling vibration wave being used as a drive source, includes means provided on at least one member of the vibration wave device at a location integer times or approximately integer times 1/2 of the wavelength of a vibration wave which may produce noise and making the dynamic rigidity of the member non-uniform.

360 citations

Patent
Guenter Dantes1, Detlef Nowak1
07 May 2002
TL;DR: In this article, a high-pressure injection valve for directly injecting fuel into a combustion chamber of a compressed-mixture, spark-ignition internal combustion engine is described, and a slit-type flow outlet is formed between the slit-forming element and a front face of the valve seat body.
Abstract: The invention relates to a fuel-injection valve, in particular a high-pressure injection valve for directly injecting fuel into a combustion chamber of a compressed-mixture, spark-ignition internal combustion engine. Said valve is characterised in that an outlet opening (23) is provided downstream of the valve seat (20), the downstream end of said opening having a slit-forming element (30) that to a great extent closes the outlet opening (23). A slit-type flow outlet (35), through which a fuel spray can be discharged in a fan-type jet, is formed between the slit-forming element (30) and a front face (34) of the valve seat body (16).

186 citations

PatentDOI
TL;DR: An acoustic wave device includes a piezoelectric film made of an aluminum nitride film containing a divalent element and a tetravalent element, and an electrode that excites an acoustic wave propagating through the film.
Abstract: An acoustic wave device includes: a piezoelectric film made of an aluminum nitride film containing a divalent element and a tetravalent element, or a divalent element and a pentavalent element; and an electrode that excites an acoustic wave propagating through the piezoelectric film.

150 citations

Patent
04 Mar 1991
TL;DR: A laminar longitudinal-effect type piezoelectric or electrostrictive driver which is displaced upon application of an electric field is described in this article.The driver is suitably usable for an actuator for operating a print element of a printer, for example.
Abstract: A laminar longitudinal-effect type piezoelectric or electrostrictive driver which is displaced upon application of an electric field thereto. The driver includes laminar electro-mechanical converting elements each undergoes a displacement in a direction of the electric field due to the longitudinal mode of the reverse piezoelectric effect or the electrostrictive effect, and the temperature compensating elements each of which is interposed between the appropriate adjacent two laminar electro-mechanical converting elements. The temperature compensating elements have a higher coefficient of linear thermal expansion in the direction of the electric field or direction of displacement of the driver. The driver is suitably usable for an actuator for operating a print element of a printer, for example.

138 citations

Patent
07 Jan 2005
TL;DR: In this article, a stacked ceramic matrix composite lamellate assembly including shear force bearing structures for resisting relative sliding movement between adjacent adjacent lamellae is described, with at least one lamella being common between adjacent subsets in order to secure the entire assembly.
Abstract: A stacked ceramic matrix composite lamellate assembly (10) including shear force bearing structures (48) for resisting relative sliding movement between adjacent lamellae. The shear force bearing structures may take the form of a cross-lamellar stitch (50), a shear pin (62), a warp (90) in the lamellae, a tongue (104) and groove (98) structure, or an inter-lamellar sealing member (112), in various embodiments. Each shear force bearing structure secures a subset of the lamellae, with at least one lamella being common between adjacent subsets in order to secure the entire assembly.

65 citations