Murata Manufacturing Co., Ltd.

Junichi Murakami

Masakazu Yamauchi

Yuko Yokoi

Kazuchika Yamada

Takaaki Kaji

A piezoelectric sounding component includes a diaphragm that includes a metal plate and a piezoelectric body formed on the metal plate. The diaphragm bends and vibrates according to application of voltage to the piezoelectric body. A casing that includes a bottom wall, side walls, and a supporting portion to support the diaphragm in inside edge portions of the side walls. The side walls extending from edges of the bottom wall in a thickness direction and includes a first wall, a second wall positioned to face the first wall, and a third wall positioned between the first wall. Two or more terminals that are formed on the first wall or the third wall serve to apply voltage to the diaphragm. Two or more elastic adhesives join the side walls and the diaphragm between the two or more terminals and the diaphragm. Two or more conductive adhesives are formed on the two or more elastic adhesives and join the two or more terminals and the diaphragm. The diaphragm is supported by the supporting portion and accommodated in the casing so that a gap formed between the first wall and the diaphragm is smaller than a gap formed between the second wall and the diaphragm.

Piezoelectric sounding component

A piezoelectric sounding component includes a diaphragm that includes a metal plate and a piezoelectric body formed on the metal plate. The diaphragm bends and vibrates according to application of voltage to the piezoelectric body. A casing includes a bottom wall, side walls which, in combination with the diaphragm define a sound chamber. The diaphragm is supported by a support portion formed in the casing such that outer peripheral edges of the diaphragm are spaced from inner surfaces of the casing. A terminal is located on the casing and is electrically connected to the diaphragm. At least two elastic adhesives join the diaphragm to the casing and respective conductive adhesives extend over its associated elastic adhesive from the diaphragm to a respective terminal. A frame-like sealing portion seals a gap between the outer peripheral edge of the diaphragm and the inner surfaces of the casing. A recessed portion is formed in a portion of the support portion facing the terminal such that the first elastic adhesive extends over the recessed portion.

Growing community of inventors

Nagaokakyo, Japan

Junichi Murakami