Taiyo Yuden Co., Ltd.

Yuuhei Ueyama

Hiroyuki Shimizu

Tomohiro Harada

Yukihiro Konishi

Sumiaki Kishimoto

A piezoelectric ceramic containing no lead as a constituent element is provided. Coefficient of variation C.V. of grain size of grains contained in the piezoelectric ceramic is 35% or less, and an image quality (IQ) image obtained by analyzing a cross section of the piezoelectric ceramic by an electron backscatter diffraction (EBSD) method shows that at least one of the grains has a grain size of 3 μm to 5 μm and an area ratio of a domain in said at least one of the grains is 85% or more.

Piezoelectric ceramics and their manufacturing methods, and piezoelectric device

A piezoelectric ceramic, which does not contain lead as a constituent element, is characterized in that: its primary component is a perovskite compound expressed by the composition formula (BiNaBa)(TiMn)O(where 0.01&#x2264;x&#x2264;0.25, 0.001&#x2264;y&#x2264;0.020); and the coefficient of variation (CV) in grain size among the grains contained therein is 35 percent or lower. The piezoelectric ceramic presents an improved dielectric loss tangent tan &#x3b4;.

Piezoelectric ceramic and method for manufacturing same, as well as piezoelectric element

A multilayer pyroelectric element includes: a laminate body constituted by multiple pyroelectric body layers laminated in their thickness direction; internal electrode layers which are provided between the pyroelectric body layers, and one ends of which extend to the outer peripheries of the adjoining pyroelectric body layers; and external electrodes that connect the alternate internal electrode layers together at the one ends, wherein 'x&#x3e;xAND x&#x3e;x' are satisfied wherein xis a distance between a pair of first faces crossing at right angles with the laminating direction of the pyroelectric body layers, xis a distance between a pair of second faces crossing at right angles with the first faces and running parallel with the laminating direction of the pyroelectric body layers, and xa is a distance between a pair of third faces crossing at right angles with the first faces and also with the second faces.

Growing community of inventors

Takasaki, Japan

Yuuhei Ueyama