Kyocera Corporation

Yoshihiro Yuu

Daisuke Takahashi

Shuzo Iwashita

Hiroshi Tamura

Ayumu Matsumoto

Hiroshi Aida

Chitoshi Ueki

Takayuki Yamamoto

Makoto Higashibeppu

Kouichi Maruta

Kousei Horiuchi

Kosei Horiuchi

Kazumasa Furuhashi

Kouji Eitoku

Shyuzo Iwashita

A liquid ejection head includes a first channel member and a plurality of pressurizing parts. The first channel member includes a plurality of ejection holes, a common channel, a damper chamber, and a damper. The first channel member is configured by a plurality of flat plates including a first plate with the plurality of ejection holes and a second plate adjacent to this. The second plate includes a first part sandwiched between the damper chamber and the first plate. A covering layer is unevenly provided on the first surface of the first part.

Liquid ejection head and recording device using same

The present invention aims at providing a piezoelectric substrate with high joining strength between an electrode of the piezoelectric substrate. The piezoelectric substrate of the present invention is a flat plate-shaped piezoelectric substrate including a piezoelectric ceramic layer, a plurality of first electrodes and a second electrode disposed on one main surface of the piezoelectric ceramic layer, a third electrode disposed on the other main surface of the piezoelectric ceramic layer so as to oppose to the first electrodes, and a through-conductor electrically connecting the second electrode and the third electrode. The second electrode includes a connection portion connected to the through-conductor, and a small-width portion having a smaller width than the connection portion when the piezoelectric substrate is viewed from above. The second electrode and the outside are electrically connected to each other at the small-width portion.

Piezoelectric substrate, assembly, liquid discharge head, and recording device, each using piezoelectric substrate

A multilayer piezoelectric actuator and a liquid discharge head are provided which are equipped with dense piezoelectric ceramics having improved insulation performance. The multilayer piezoelectric actuator comprises a multilayered body comprising a plurality of piezoelectric ceramic layers containing a PZT phase as a main crystal phase; and an electrode layer containing Ag, which is disposed at least one of on the surface and in the interior of the multilayered body. A lattice constant c of c-axis of the PZT phase is 0.4085 nm to 0.4100 nm, and a ratio of the lattice constant c of the c-axis of the PZT phase and a lattice constant a of a-axis, namely, the ratio c/a, is 1.011 or more. A second phase containing Ag different from the PZT phase is not substantially contained in the piezoelectric ceramic layer. A ZnSiOphase is contained at grain boundaries of the PZT phase, and a PbSiOphase is not substantially contained at the grain boundaries of the PZT phase.

Multilayer piezoelectric actuator and liquid discharge head

An actuatorin which a displacement elementhas a piezoelectric ceramic layerand a pair of electrodesinterposing therebetween the piezoelectric ceramic layer. The entire thickness of the actuatoris 100 &#x3bc;m or less. The piezoelectric ceramic layerand the substratehave as their principal component a perovskite crystal containing at least Pb; Zr and Ti, and, the maximum difference in a composition ratio Pb/(Ti+Zr) between the surface of the piezoelectric ceramic layerand the inside of the substrateis 0.02 or less. This reduces characteristic variation.

Actuator, its manufacturing method and printing head

The laminated piezoelectric element having a thickness of 100 &#x3bc;m or less of the present invention comprises a laminate which comprises a plurality of piezoelectric ceramic layers, and electrodesprovided the surface and the inside of the laminate, wherein the electrodecomprises a silver-palladium alloy containing 71 to 99.9% by volume of silver and 0.1 to 29% by volume of palladium.

Laminated piezoelectric element, actuator and printing head

Growing community of inventors

Kirishima, Japan

Yoshihiro Yuu