Murata Manufacturing Co., Ltd.

Yutaka Kawai

Takeshi Yamazaki

Tetsuo Takeshima

Shigemasa Kusabiraki

Toshio Nishimura

Toshihiko Unami

Toshiyuki Baba

Hirohide Yoshino

Tatsunori Kakuda

A method of manufacturing a resonance element includes the steps of preparing a multilayered body having a plurality of piezoelectric layers and a plurality of inner electrodes laminated to each other, forming an insulating film on one surface of the multilayered body at exposed portions of the inner electrodes, the insulating film having a plurality of openings constituting substantially parallel rows which are substantially parallel to the laminating direction of the multilayered body, forming an outer electrode on substantially the entire surface on which the insulating film is formed, forming a plurality of grooves on the surface on which the outer electrode is formed and cutting the multilayered body substantially parallel to the grooves, wherein a first group of the openings in a first of the rows are disposed on every alternate exposed portion of the internal electrodes, and a second group of remaining openings in a second row adjacent to the first row are disposed on each of the remaining alternate exposed portions of the internal electrodes, the first and second row are separated from each other by a predetermined distance and the groove is formed between the first and second rows.

Method of manufacturing piezoelectric resonator

A piezoelectric resonator which vibrates in a longitudinal vibration mode includes first insulating films disposed on a side surface of a base member so as to cover at least part of exposed portions of a first group of the internal electrodes and second insulating films disposed on the side surface of the base member so as to cover at least part of the exposed portions of a second group of the internal electrodes. A first thin-film external electrode extends continuously in the longitudinal direction of the base member on the first insulating films and a second thin-film external electrode extends continuously in the longitudinal direction of the base member on the second insulating film. A first conductive resin film and a second conductive resin film are respectively provided on the first thin-film external electrode and the second thin-film external electrode such that even if the thin-film external electrodes are broken or damaged, the piezoelectric resonator still functions.

Piezoelectric resonator and electronic component using the same

A base member of a piezoelectric resonator includes a laminated body having a plurality of piezoelectric layers which are alternately polarized in opposite directions along the longitudinal direction of the base member and inner electrodes provided between the piezoelectric layers. On a first side surface of the base member, each of two external electrodes is arranged so as to be connected to one of two groups of alternate inner electrodes. Cut portions for adjusting a frequency of the piezoelectric resonator to a higher frequency are respectively formed at edge portions of the base member at opposite ends in the longitudinal direction of a second side surface opposite from the first side surface of the base member.

Piezoelectric resonator method for adjusting frequency of piezoelectric

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Hakui, Japan

Yutaka Kawai