Murata Manufacturing Co., Ltd.

Toshiyuki Baba

Jiro Inoue

Toshio Nishimura

Toshihiko Unami

Shoichi Kawabata

Tetsuo Takeshima

Shigemasa Kusabiraki

Hirohide Yoshino

Tsuyoshi Kitagawa

Mamoru Ogawa

Eitaro Kameda

Takeshi Yamazaki

Takashi Shimura

Koichi Nagano

Yuusei Oyama

Tatsunori Kakuda

Atsushi Uno

Takashi Yamamoto

Masashi Omura

Takashi Mizuguchi

Hideaki Kuroda

Yutaka Kawai

Yasuhiro Morimoto

A conductive cap for use in an electronic component, has an opening at a bottom portion thereof, and is constructed to be fixed to the upper surface of a substrate of the electronic component at the opening portion of the cap so as to cover at least an electronic component element mounted on the upper surface of the substrate having terminal electrodes provided thereon. The end surface of the opening and the inner and outer surfaces thereof in connection to and in the vicinity of the end surface are provided with an insulating film disposed thereon.

Conductive cap, electronic component, and method of forming insulating film of conductive cap

A surface acoustic wave device includes a surface acoustic wave element mounted on a substrate, and the surface acoustic wave element is sealed by a resin sealing layer. Even when the size of the surface acoustic wave element is reduced, a short circuit in a mounting electrode is prevented from occurring when it is mounted, a fillet formation of a conductive bond in the mounting can be easily and visually checked, and the cost can be reduced. The surface acoustic wave element is mounted on a multi-layered substrate by a face-down mounting method by using bumps, the surface acoustic wave element is sealed by the resin sealing layer, electrode lands on an upper surface of the multi-layered substrate connected to the bumps are connected to internal electrodes through via hole electrodes, and the internal electrodes are electrically connected to the mounting electrodes on a lower surface of the multi-layered substrate and end surface wiring electrodes.

Surface acoustic wave device

Method of forming insulating film of conductive cap by anodizing or electrodeposition

A surface mount type electronic component includes a substantially rectangular case substrate, an electronic element mounted on the case substrate along the longitudinal direction, and a cap which is fixed onto the case substrate in such a manner as to cover the electronic element. First and second top-surface electrodes and first and second bottom-surface electrodes, which extend along the width direction of the case substrate, are arranged with a spacing on the top surface and the bottom surface of the case substrate, respectively. The first top-surface electrode and the first bottom-surface electrode are connected to each other via a first side electrode disposed on the side surface of the case substrate, and the second top-surface electrode and the second bottom-surface electrode are connected to each other via a second side electrode disposed on the side surface of the case substrate.

Surface mount type electronic component

A piezoelectric resonance component includes a capacitor substrate, a piezoelectric resonator mounted on the capacitor substrate, and a cover member fixedly attached to the capacitor substrate. The capacitor substrate includes a dielectric substrate, a plurality of inner electrodes arranged in layers within the dielectric substrate, and a plurality of outer electrodes disposed on at least one of opposed side surfaces of the dielectric substrate. The plurality of inner electrodes include an inner electrode to be connected to a ground potential and a pair of split inner electrodes located at a common vertical position and spaced apart from each other with respect to a central portion of the dielectric substrate.

Piezoelectric resonance component

A piezoelectric resonator includes a base member including a plurality of laminated piezoelectric layers and internal electrodes. The adjacent piezoelectric layers are polarized in different directions with an internal electrode disposed therebetween. A groove is provided on one lateral surface of the base member, and every other internal electrode is exposed at both sides of the groove. Insulating films are disposed on unexposed portions of the internal electrodes. External electrodes are provided on both sides of the groove in the base member and are connected to the internal electrodes. As a result of this structure, the piezoelectric resonator prevents a reduction in the difference .DELTA.F between the resonant frequency and the anti-resonant frequency.

Piezoelectric resonator and electronic component including same

A piezoelectric resonator having a small spurious resonance and a large difference .DELTA.F between the resonant frequency and the antiresonant frequency has a compact size and an external electrode has a structure which prevents damage or breaking of the external electrode. The piezoelectric resonator has a substantially rectangular-parallelepiped base member which includes a plurality of laminated piezoelectric layers. A middle portion of the piezoelectric layers is polarized in opposite directions relative to each other. On main surfaces of the middle part of the piezoelectric layers, first and second groups of inner electrodes and are exposed alternately at both side surfaces of the base member. On both side surfaces of the base member, first and second external electrodes are arranged so as to alternately connect to the first and second groups of inner electrodes.

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 piezoelectric resonator includes a piezoelectric resonator element vibrating in a longitudinal vibration mode and having a mounting surface, wherein a resin material is provided on the mounting surface of the piezoelectric resonator element, and the resin material has a hardness of about 0 to about 50 in units defined in the JIS-A standards and/or an elastic modulus of about 0.1 to 10 MPa.

A piezoelectric resonator having a small spurious resonance, a large frequency difference .DELTA.F between the resonant frequency and the anti-resonant frequency, adjustable capacitance, and high design flexibility includes a base member formed by laminating, for example, a plurality of piezoelectric layers and internal electrodes. When the length, width, and thickness of the base member are indicated by L, W and T, respectively, the dimensions of the member are selected to satisfy the conditions of L.gtoreq.2W and L.gtoreq.2T. The base member is polarized at both ends of each internal electrode in opposite directions. A groove is preferably formed on one lateral surface of the base member, and at both sides of the groove, the internal electrodes are alternately covered with two insulating films. The two insulating films are respectively formed to cover the different internal electrodes. External electrodes are formed on both sides of the groove of the base member and are connected to the internal electrodes.

Piezoelectric resonator and electronic component containing same

A piezoelectric resonator has a base member formed by laminating a plurality of piezoelectric layers and electrodes. The base member is polarized in different directions at both sides of each electrode. Electrodes are alternately covered by a first insulating film and a second insulating film, respectively, at both sides of a groove formed in the base member. The first insulating film covers electrodes which are not covered by the second insulating film, and vice versa. External electrodes are formed at both sides of the groove on the base member and the internal electrodes are connected to the external electrodes. A support member made from an electrically conductive material is provided at the approximate centers of the external electrodes.

Piezoelectric resonator, manufacturing method therefor, and electronic

A terminal for a piezoelectric device has a first electrode portion, a second electrode portion folded on the first electrode portion, projections on the first and second electrode portions, and further a vibration absorber between the first and second electrode portions. As the vibration absorber, oil, a non-volatile component of oil, silicone grease, polyamide resin, paper, an anticorrosive, a coating agent, silicone rubber, etc. may be used. Another terminal for a piezoelectric device has a sealant between the first electrode portion and the second electrode portion.

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Moriyama, Japan

Toshiyuki Baba