Abstract: A piezoelectric vibration device that includes a piezoelectric vibrator having excitation electrodes formed thereon; a base having the piezoelectric vibrator on a first surface thereof; outer electrodes formed to continuously extend from the first surface of the base through a side face of the base to a second surface of the base opposite the first surface; and a lid having a recess opening that faces the first surface of the base, the lid being joined to the base to hermetically seal the piezoelectric vibrator in an internal space defined by the recess and the base. An edge portion of a corresponding one of the outer electrodes, formed by the first surface and the side face of the base, is at least partly covered by a covering member having insulating properties.

Abstract: A lid and an insulating bonding layer that seal a piezoelectric vibrator on a substrate are bonded with higher strength. A piezoelectric vibration component includes a substrate having a principal surface on which a piezoelectric vibrator is mounted, an insulating film disposed on the principal surface, a lid having a recess opening toward the principal surface and an edge portion around the recess. Moreover, first and second insulating bonding layers are interposed between the lid and the substrate. The first and second insulating bonding layers are joined together between the edge portion and the insulating film so as to seal the piezoelectric vibrator in a space between the recess and the principal surface.

Abstract: A piezoelectric vibration component that includes a substrate having a principal surface and a side face, a piezoelectric vibrator, a lid, and an adhesive layer that hermetically seals the piezoelectric vibrator in a space between the lid and the principal surface. The adhesive layer extends from the principal surface to at least a portion of the side face of the substrate.

Abstract: A crystal vibrator includes an AT-cut crystal substrate with a vibration portion having a principal surface and a peripheral portion surrounding and thinner than the vibration portion. An excitation electrode is formed on the principal surface and an extension electrode is electrically connected to the excitation electrode. The vibration portion has a first short-edge side lateral surface that abuts the peripheral portion at an acute angle and a tapered lateral surface adjacent to the first short-edge side lateral surface and inclined with respect to the X axis in the XZ? plane. The tapered lateral surface abuts the peripheral portion at an angle that is greater than the angle defined by the first short-edge side lateral surface. The extension electrode extends from the excitation electrode through the tapered lateral surface to a first short-edge side in a longitudinal direction parallel to the Z? axis.

Abstract: A crystal vibrator that includes a crystal substrate having a front surface and a rear surface, including a vibration portion in a region including a center of the crystal substrate, and a first peripheral portion that surrounds a periphery of the vibration portion and that has a smaller thickness than the vibration portion. Drive electrodes are formed on both surfaces of the vibration portion of the crystal substrate. In at least one of the front surface and the rear surface of the crystal substrate, a step is provided between the vibration portion and the first peripheral portion, and a first peripheral edge portion of the vibration portion and a second peripheral edge portion of the first peripheral portion are in a curved surface shape.

Abstract: A piezoelectric vibration device that includes a piezoelectric vibrator having excitation electrodes formed thereon; a base having the piezoelectric vibrator on a first surface thereof; outer electrodes formed to continuously extend from the first surface of the base through a side face of the base to a second surface of the base opposite the first surface; and a lid having a recess opening that faces the first surface of the base, the lid being joined to the base to hermetically seal the piezoelectric vibrator in an internal space defined by the recess and the base. An edge portion of a corresponding one of the outer electrodes, formed by the first surface and the side face of the base, is at least partly covered by a covering member having insulating properties.

Abstract: A crystal vibrator includes an AT-cut crystal substrate with a vibration portion having a principal surface and a peripheral portion surrounding and thinner than the vibration portion. An excitation electrode is formed on the principal surface and an extension electrode is electrically connected to the excitation electrode. The vibration portion has a first short-edge side lateral surface that abuts the peripheral portion at an acute angle and a tapered lateral surface adjacent to the first short-edge side lateral surface and inclined with respect to the X axis in the XZ? plane. The tapered lateral surface abuts the peripheral portion at an angle that is greater than the angle defined by the first short-edge side lateral surface. The extension electrode extends from the excitation electrode through the tapered lateral surface to a first short-edge side in a longitudinal direction parallel to the Z? axis.

Abstract: A piezoelectric vibration component that includes a substrate having a principal surface and a side face, a piezoelectric vibrator, a lid, and an adhesive layer that hermetically seals the piezoelectric vibrator in a space between the lid and the principal surface. The adhesive layer extends from the principal surface to at least a portion of the side face of the substrate.

Abstract: A lid and an insulating bonding layer that seal a piezoelectric vibrator on a substrate are bonded with higher strength. A piezoelectric vibration component includes a substrate having a principal surface on which a piezoelectric vibrator is mounted, an insulating film disposed on the principal surface, a lid having a recess opening toward the principal surface and an edge portion around the recess. Moreover, first and second insulating bonding layers are interposed between the lid and the substrate. The first and second insulating bonding layers are joined together between the edge portion and the insulating film so as to seal the piezoelectric vibrator in a space between the recess and the principal surface.

Abstract: A crystal vibrator that includes a crystal substrate having a front surface and a rear surface, including a vibration portion in a region including a center of the crystal substrate, and a first peripheral portion that surrounds a periphery of the vibration portion and that has a smaller thickness than the vibration portion. Drive electrodes are formed on both surfaces of the vibration portion of the crystal substrate. In at least one of the front surface and the rear surface of the crystal substrate, a step is provided between the vibration portion and the first peripheral portion, and a first peripheral edge portion of the vibration portion and a second peripheral edge portion of the first peripheral portion are in a curved surface shape.

Abstract: A piezoelectric electroacoustic transducer includes a substantially rectangular piezoelectric diaphragm, a case having supports to support the four corners of the bottom surface of the piezoelectric diaphragm, terminals fixed to the case, each including an inner connection portion exposed near the supports, a first elastic adhesive disposed between the periphery of the piezoelectric diaphragm and the terminals, a conductive adhesive disposed between electrodes of the piezoelectric diaphragm and the terminals across the top surface of the first elastic adhesive, a second elastic adhesive filling and sealing a gap between the periphery of the piezoelectric diaphragm and an inner portion of the case, and an overamplitude-preventing receiver provided on a bottom wall of the case to limit the amplitude of vibration of the piezoelectric diaphragm to a predetermined range. The overamplitude-preventing receiver is disposed closer to the center of the piezoelectric diaphragm than the supports.

Abstract: A package of a surface-mountable electronic component to be reflow-soldered to a circuit board at about 250° C. or more includes a case and a cover. The cover has a softening temperature lower than the reflow temperature, and the case has a softening temperature higher than the reflow temperature. In the package, softening the cover compensates for the stress on the bonded surfaces resulting from a difference in thermal expansion between the case and the cover caused during reflow.

Abstract: A piezoelectric electroacoustic transducer includes a substantially rectangular piezoelectric diaphragm, a case having supports to support the four corners of the bottom surface of the piezoelectric diaphragm, terminals fixed to the case, each including an inner connection portion exposed near the supports, a first elastic adhesive disposed between the periphery of the piezoelectric diaphragm and the terminals, a conductive adhesive disposed between electrodes of the piezoelectric diaphragm and the terminals across the top surface of the first elastic adhesive, a second elastic adhesive filling and sealing a gap between the periphery of the piezoelectric diaphragm and an inner portion of the case, and an overamplitude-preventing receiver provided on a bottom wall of the case to limit the amplitude of vibration of the piezoelectric diaphragm to a predetermined range. The overamplitude-preventing receiver is disposed closer to the center of the piezoelectric diaphragm than the supports.

Abstract: An insert terminal containing case includes a bottom wall, four side walls, and an opening at the upper portion, wherein a terminal made of a metal plate is vertically fixed to at least one of the four side walls by insert molding. A groove is vertically arranged at the outer side surface of the side wall fixing the terminal, the groove extending downward, the outer side surface of the terminal is partially exposed at the groove, and the inner side surface opposite the outer side surface of the terminal exposed at the groove is partially exposed at the inner side surface of the side wall. Therefore, when the terminal is provided in the case by insert molding, molding can be performed only using upper and lower dies. Furthermore, the terminal can be reliably exposed at the inner surface of the side wall. The insert terminal containing case has the minimum difference between the opening dimension of the case and the dimension of a piezoelectric diaphragm and is molded without using a sliding die.

Abstract: A piezoelectric electroacoustic transducer includes a quadrilateral piezoelectric diaphragm, a case for accommodating the piezoelectric diaphragm, and terminals fixed to the case so that inner connecting portions thereof are exposed on the inside of the case. Conductive adhesives are applied between lead electrodes of the piezoelectric diaphragm and inner connecting portions of the terminals. The conductive adhesives are applied to positions near two adjacent corners of the piezoelectric diaphragm.

Abstract: A piezoelectric electroacoustic transducer includes a piezoelectric sounding body in which bending vibration is generated by applying an alternating signal between two electrodes, a case housing the piezoelectric sounding body, and a pair of terminals insert-molded in the case. In the piezoelectric electroacoustic transducer, internal connection portions of the pair of terminals are exposed on the inside surface of the side wall portion of the case so as to extend in a direction that is substantially perpendicular relative to the piezoelectric sounding body, and the internal connection portions of the terminals are electrically connected to the electrodes of the piezoelectric sounding body by using conductive adhesive. The internal connection portions of the terminals do not largely extend inside the case and accordingly, the dimensional difference between the case and the piezoelectric sounding body is minimized.

Abstract: An insert terminal containing case includes a bottom wall, four side walls, and an opening at the upper portion, wherein a terminal made of a metal plate is vertically fixed to at least one of the four side walls by insert molding. A groove is vertically arranged at the outer side surface of the side wall fixing the terminal, the groove extending downward, the outer side surface of the terminal is partially exposed at the groove, and the inner side surface opposite the outer side surface of the terminal exposed at the groove is partially exposed at the inner side surface of the side wall. Therefore, when the terminal is provided in the case by insert molding, molding can be performed only using upper and lower dies. Furthermore, the terminal can be reliably exposed at the inner surface of the side wall. The insert terminal containing case has the minimum difference between the opening dimension of the case and the dimension of a piezoelectric diaphragm and is molded without using a sliding die.

Abstract: A piezoelectric electro-acoustic transducer includes a substantially rectangular piezoelectric diaphragm, a casing having a support unit for supporting four corners of the piezoelectric diaphragm, terminals fixed to the casing such that an internal connection portion of the terminal is exposed in the vicinity of the support unit, a first elastic adhesive for coating between the external periphery of the piezoelectric diaphragm and the internal connection portion of the terminal therewith, a conductive adhesive for coating between electrodes of the piezoelectric diaphragm and the internal connection portion of the terminal via the upper surface of the first elastic adhesive therewith, and a second elastic adhesive for sealing the external periphery of the piezoelectric diaphragm and the internal periphery of the casing, and a cradle provided in the internal periphery of the casing as well as below the piezoelectric diaphragm in the vicinity that is coated with the first elastic adhesive for forming a gap for s

Abstract: A package of a surface-mountable electronic component to be reflow-soldered to a circuit board at about 250° C. or more includes a case and a cover. The cover has a softening temperature lower than the reflow temperature, and the case has a softening temperature higher than the reflow temperature. In the package, softening the cover compensates for the stress on the bonded surfaces resulting from a difference in thermal expansion between the case and the cover caused during reflow.

Abstract: A piezoelectric electro-acoustic transducer includes a substantially rectangular piezoelectric diaphragm, a casing having a support unit for supporting four corners of the piezoelectric diaphragm, terminals fixed to the casing such that an internal connection portion of the terminal is exposed in the vicinity of the support unit, a first elastic adhesive for coating between the external periphery of the piezoelectric diaphragm and the internal connection portion of the terminal therewith, a conductive adhesive for coating between electrodes of the piezoelectric diaphragm and the internal connection portion of the terminal via the upper surface of the first elastic adhesive therewith, and a second elastic adhesive for sealing the external periphery of the piezoelectric diaphragm and the internal periphery of the casing, and a cradle provided in the internal periphery of the casing as well as below the piezoelectric diaphragm in the vicinity that is coated with the first elastic adhesive for forming a gap for s