Kyocera Corporation

Hitoshi Nakakubo

Shuichi Fukuoka

Tomonori Eguchi

A piezoelectric ceramic plate which is slightly deformed by firing, includes a plate-shaped substrate, and an electronic component. The piezoelectric ceramic plate has a pair of main surfaces, a pair of opposing first side surfaces, and a pair of opposing second side surfaces. The pair of first side surfaces are baked surfaces, and the distance between the pair of first side surfaces measured at the center in the longitudinal direction is denoted by Lc and the distance between the pair of first side surfaces measured at ends in the longitudinal direction is denoted by Le. The ratio of the difference &#x394;L between Le and Lc to Lc (&#x394;L/Lc) is 1.0% or less. The piezoelectric ceramic plate is suitably used as a piezoelectric ceramic plate having an area of each of the main surfaces of 360 mmor more and a thickness of 150 &#x3bc;m or less.

Piezoelectric ceramic plate, plate-shaped substrate and electronic component

A piezoelectric ceramic may be slightly deformed by firing, and a manufacturing method therefor, and an electronic component are disclosed. There is provided a piezoelectric ceramic including a plurality of crystal grains including a lead zirconate titanate-type crystal containing Zn, and Bi, and crystal grain boundaries existing between a plurality of the crystal grains, wherein a plurality of the crystal grains include first crystal grains, and wherein the first crystal grains have a content of at least one element of Zn and Bi present in the inside of the first crystal grains that is smaller than the content of the at least one element present in an area including the crystal grain boundaries that are in contact with the crystal grains. The piezoelectric ceramic is slightly deformed by firing and is capable of forming an electronic component which has little warp or deformation even if it is thin.

Piezoelectric ceramic, manufacturing method therefor, and electronic component

A piezoelectric ceramic composition including potassium-sodium-lithium niobate, bismuth-sodium titanate and bismuth ferrate is provided. A piezoelectric ceramic obtained by firing the piezoelectric ceramic composition, wherein the electromechanical coupling factor is high, the piezoelectric gconstant, in particular, is large, the second phase transformation does not exist in the temperature range of &#x2212;40 to 150&#xb0; C. in at least one of a temperature-dependent variation of a resonance frequency, a temperature-dependent variation of an anti-resonance frequency and a temperature-dependent variation of piezoelectric gconstant, and a good heat-resistant property is obtained, is provided.

Growing community of inventors

Kirishima, Japan

Hitoshi Nakakubo