Murata Manufacturing Co., Ltd.

Murata Manufacturingco., Ltd.

Takahiro Norichi

Masaharu Fujiya

Tatsuya Ikeshima

An elastic wave device includes a substrate, an IDT electrode, a wire, an electrically insulating film, and an identification marking. The substrate has piezoelectricity. The IDT electrode is provided on the substrate and includes a pair of comb-shaped electrodes facing each other. The wire is provided on the substrate and connected to the IDT electrode. The electrically insulating film is provided at least on the IDT electrode and the wire. The identification marking is defined by an uneven portion of a surface of the electrically insulating film. The identification marking does not to overlap the IDT electrode in plan view of the substrate.

Elastic wave device

A longitudinally-coupled-resonator-type surface acoustic wave filter includes an unbalanced terminal, balanced terminals, a piezoelectric substrate, a first surface acoustic wave filter unit, a second surface acoustic wave filter unit, an unbalanced signal wiring line, balanced signal wiring lines, a pair of interstage wiring lines that connect the first surface acoustic wave filter unit and the second surface acoustic wave filter unit to each other, and ground wiring lines. The first surface acoustic wave filter unit includes a first IDT and a pair of a second IDT and a third IDT. The first IDT includes a pair of first divided comb tooth shaped electrodes obtained by dividing a comb tooth shaped electrode on the side spaced from the unbalanced terminal along a central axis.

Growing community of inventors

Nagaokakyo, Japan

Takahiro Norichi