A crystal controlled oscillator includes a crystal unit, an integrated circuit, and an insulating resin. The crystal unit contains a crystal vibrating piece resonating at a predetermined frequency. The integrated circuit places the crystal unit. The integrated circuit includes an oscillator circuit oscillating the crystal vibrating piece. The insulating resin is formed to cover the crystal unit on the integrated circuit.

A vibrator device including a vibrator element, an IC substrate including a semiconductor substrate configured of a semiconductor having a first conductive type and a circuit electrically coupled to the vibrator element, the first conductive type being any one of an N-type and a P-type, and a lid directly bonded to the semiconductor substrate and configured of a semiconductor having the first conductive type.

A vibrator element includes a vibrator section that has a first principal surface, a second principal surface, a first side surface, and a second side surface, a support section that is disposed at a distance from the vibrator section and has a first support side surface facing the first side surface of vibrator section and a second support side surface extending in a direction that intersects with the direction in which the first support side surface extends, and a linkage section that has a first linkage surface coupled to the first side surface and the first support side surface and a second linkage surface coupled to the second side surface and the second support side surface, and the first linkage surface has a configuration in which at least one of a first section coupled to the first side surface and a second section coupled to the first support side surface has a curved surface.

A composite filter device includes a piezoelectric substrate, a transmission filter, a reception filter, a first capacitance element, and a second capacitance element. The transmission filter includes a first parallel arm resonator connected to a first reference potential electrode. The reception filter includes a second parallel arm resonator connected to a second reference potential electrode. The first capacitance element is connected between a signal line in the reception filter and the first reference potential electrode. The second capacitance element is connected to the signal line and the second reference potential electrode in the reception filter.

A method for manufacturing a piezoelectric resonator unit by forming a via conductor in a through hole of a ceramic substrate, forming a connection electrode foundation layer connected to the via conductor, and forming a sealing frame foundation layer in a substantially frame shape. The ceramic substrate is then fired together with the via conductor, the connection electrode foundation layer, and the sealing frame foundation layer. The surface of the connection electrode foundation layer and the surface of the sealing frame foundation layer are flattened by pressing the ceramic substrate from a first main surface side and a second main surface side thereof. A plating treatment is carried out to form a connecting electrode and a sealing frame. A piezoelectric resonator is electrically connected to the connection electrode.

A crystal unit includes an AT-cut crystal element that has a planar shape in a rectangular shape and a part as a thick portion. The crystal element includes a first end portion, a depressed portion, the thick portion, and a second end portion in this order from a side of one short side in viewing a cross section taken along a longitudinal direction near a center of the short side. The depressed portion is a depressed portion disposed from the thick portion toward the first end portion side, depressed with a predetermined angle a and subsequently bulged, and connected to the first end portion.

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.

A rectangular quartz crystal blank having long sides substantially parallel to a Z axis of the quartz crystal blank, and short sides substantially parallel to an X axis of the quartz crystal blank. The quartz crystal blank includes a center region, a second region and a third region that are adjacent to the center region along a long-side direction, and a fourth region and a fifth region that are adjacent to the first region along a short-side direction. A thickness of the second region and a thickness of the third region are smaller than a thickness of the first region, and/or a thickness of the fourth region and a thickness of the fifth region are smaller than a thickness of the first region, and 25.93W/T27.07, where W is a length of a short side and T is a thickness.

A rectangular quartz crystal blank having long sides substantially parallel to a Z axis of the quartz crystal blank, and short sides substantially parallel to an X axis of the quartz crystal blank. The quartz crystal blank includes a center region, a second region and a third region that are adjacent to the center region along a long-side direction, and a fourth region and a fifth region that are adjacent to the first region along a short-side direction. A thickness of the second region and a thickness of the third region are smaller than a thickness of the first region, and/or a thickness of the fourth region and a thickness of the fifth region are smaller than a thickness of the first region, and 20.78W/T22.10, where W is a length of a short side and T is a thickness.

A rectangular quartz crystal blank having long sides substantially parallel to a Z axis of the quartz crystal blank, and short sides substantially parallel to an X axis of the quartz crystal blank. The quartz crystal blank includes a center region, a second region and a third region that are adjacent to the center region along a long-side direction, and a fourth region and a fifth region that are adjacent to the first region along a short-side direction. A thickness of the second region and a thickness of the third region are smaller than a thickness of the first region, and/or a thickness of the fourth region and a thickness of the fifth region are smaller than a thickness of the first region, and 16.21W/T17.71, where W is a length of a short side and T is a thickness.