A crystal blank includes a pair of tableland-shaped first mesa parts projecting from a flat plate and a pair of tableland-shaped second mesa parts projecting from the pair of first mesa parts. The flat plate's length in a long direction is less than 1000 m. The first mesa part is on an inner side of the flat plate's major surface. The second mesa part is on the first mesa part's inner side of an upper surface's outer edge at two ends of the long direction and has a width equivalent to the first mesa part's upper surface at two sides of a short direction. An excitation electrode reaches the second mesa part's outer edge of the upper surface, is located on the inner side of the first mesa part, and on the second mesa part's inner side of the upper surface's outer edge at two sides of the short direction.

A piezoelectric device includes a piezoelectric vibrating piece, a container, and a lid. The piezoelectric vibrating piece is bevel processed and has a bevel surface at one end of the piezoelectric vibrating piece. Thea container holds the piezoelectric vibrating piece with the bevel surface at the one end of the piezoelectric vibrating piece. The container has a connection pad at a holding region of the container and a pillow portion at a region corresponding to the other end of the piezoelectric vibrating piece. The lid member seals the container. The connection pad is buried in the container at the holding region in a state of a flat surface with a surface of the container and in a state where the surface of the connection pad is exposed. The piezoelectric vibrating piece is spanned between the surface of the connection pad and a top surface of the pillow portion.

Provided is an oscillator including a resonator which includes a resonator element and a resonator element container accommodating the resonator element, an integrated circuit element which includes an inductor, and a nonconductive spacer member, in which the resonator and the integrated circuit element are stacked above each other, the resonator has a metal member, and the spacer member is provided between the resonator and the integrated circuit element.

A vibration device including a vibrator, a circuit component, a relay substrate disposed between the vibrator and the circuit component, a package that accommodates the vibrator, the circuit component, and the relay substrate, a first metal bump that joins the circuit component to the package, a second metal bump that joins the relay substrate to the circuit component, and a third metal bump that joins the vibrator to the relay substrate.

Provided is an oscillator including: a resonant element; an oscillation circuit oscillating the resonant element; a first temperature sensor; a second temperature sensor that is provided at a location farther from the resonant element, than the first temperature sensor is; a temperature adjustment element adjusting a temperature of the resonant element; and a temperature control circuit generating a temperature control signal for controlling the temperature adjustment element on the basis of a temperature set value of the resonant element, a first temperature detection value detected by the first temperature sensor, and a temperature control correction value that is non-linear with respect to a second temperature.

A resonator element includes a quartz crystal substrate including a first surface along an X axis which is an electrical axis, a second surface along the X axis, and a side surface, a first excitation electrode, a second excitation electrode, a first coupling electrode, a second coupling electrode, a first extraction electrode that couples the first excitation electrode and the first coupling electrode, and a second extraction electrode that couples the second excitation electrode and the second coupling electrode. In plan view, a virtual extension region is obtained by extending the first excitation electrode along the X axis.

An oscillator includes a first container, a second container accommodated in the first container, a resonator element accommodated in the second container, a temperature sensor accommodated in the second container, a first circuit element that is accommodated in the second container and includes an oscillation circuit that causes the resonator element to oscillate so as to generate an oscillation signal on which temperature compensation is performed based on a detected temperature of the temperature sensor, and a second circuit element which is accommodated in the first container and includes a frequency control circuit that controls a frequency of the oscillation signal. The second container and the second circuit element are spaced from each other and are disposed to overlap each other in plan view.

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.

A piezoelectric resonator unit includes a base member having a mounting surface. A piezoelectric resonator is mounted on the mounting surface and a lid member is bonded to the mounting surface such that the piezoelectric resonator is hermetically sealed in an inner space. A heat conductor is connected to a temperature sensor that detects a temperature of the piezoelectric resonator and is connected to a heating element that radiates heat onto the piezoelectric resonator. The heat conductor has a portion that is arranged in the inner space.

A method of manufacturing a piezoelectric resonator unit that includes mounting a piezoelectric resonator on a base member using a conductive adhesive, keeping the piezoelectric resonator in an environment having a temperature and a humidity higher than those of a surrounding region for a predetermined time, performing frequency adjustment of the piezoelectric resonator by etching using an ion beam, and joining a lid member to the base member using a joining material such that the piezoelectric resonator is hermetically sealed between the lid member and the base member.