Murata Manufacturing Co., Ltd.

Motonori Matsushita

Isao Ikeda

Makoto Irie

Yoshihiro Ikeda

Tetsuya Morimura

A quartz crystal unit that includes a quartz crystal resonator with a quartz crystal blank on which a pair of excitation electrodes are formed, a frame body that surrounds an outer periphery of the blank, and a coupling member that couples the frame body to the blank. Moreover, a package member is joined to an entire periphery of the frame body on at least one side of the excitation electrodes; and an extension electrode is provided that is electrically connected to one of the excitation electrodes. A recess is formed in a junction region of at least one of the frame body and the package member. In the junction region, the extension electrode is disposed in the recess in such a way that the extension electrode has a thickness that does not exceed a depth of the recess.

Quartz crystal unit and method of manufacturing the same

A method of forming a quartz crystal resonator is provided with the resonator including a body portion with first and second main surfaces facing each other and, in plan view having a pair of long sides extending in a first direction and a pair of short sides extending in a second intersecting direction. Moreover, first and second excitation electrodes are formed on the respective main surfaces; a frame surrounds the body portion at both ends and is separated from the both ends; and first and second coupling portions extend from the short sides and with widths of the short sides. At least one of the first and second coupling portions is formed with a thickness in a third direction is smaller than a thickness in the third direction of a region of the body portion where the first excitation electrode and the second excitation electrode face each other.

Method of manufacturing quartz crystal resonator and quartz crystal resonator unit

A quartz crystal resonator is provided that includes a body portion with first and second main surfaces facing each other and, in plan view has a pair of long sides extending in a first direction and a pair of short sides extending in a second intersecting direction. Moreover, first and second excitation electrodes are disposed on the first and second main surfaces respectively; a frame surrounds the body portion at both ends and is separated from the both ends; and first and second coupling portions extend from the short sides in the first direction with widths of the short sides. At least one of the first and second coupling portions has a portion whose thickness in a third direction is smaller than a thickness in the third direction of a region of the body portion where the first excitation electrode and the second excitation electrode face each other.

Quartz crystal resonator and quartz crystal resonator unit

A method of manufacturing a piezoelectric resonator includes forming first electrodes larger than vibrating electrodes in an area Dincluding the vibrating electrodes on obverse and reverse surfaces of a piezoelectric substrate, and measuring the resonant frequency frof a resonator including the first electrodes. The thickness of a metallic thin film required for frequency adjustment is determined based on the measured resonant frequency. Then, second electrodes formed of the metallic thin film having the determined thickness are formed in an area Dincluding at least the vibrating electrodes of the piezoelectric substrate. By removing unnecessary portions of the first and second electrodes, a pattern of the resulting vibrating electrodes is formed. Thus, high-accuracy frequency adjustment can be achieved without the need for complicated positioning.

Growing community of inventors

Nagaokakyo, Japan

Motonori Matsushita