Tokyo, Japan
Tokyo, Japan

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Patent
Nihon Dempa Kogyo Co. | Date: 2016-09-01

A crystal unit includes an AT-cut crystal element, excitation electrodes, extraction electrodes. The AT-cut crystal element has an approximately rectangular planar shape. The excitation electrodes are disposed on front and back of principal surfaces of the AT-cut crystal element. The extraction electrodes are extended from the excitation electrodes to a side of one side of the AT-cut crystal element via a side surface of the AT-cut crystal element. Assuming that an extraction angle of the extraction electrode from the principal surface to the side surface is defined as an angle with respect to an X-axis of a crystallographic axis of a crystal, the angle is equal to or greater than 59 degrees and equal to or less than 87 degrees.


Patent
Nihon Dempa Kogyo Co. | Date: 2016-09-01

A crystal unit includes an AT-cut crystal element and a container. The AT-cut crystal element has an approximately rectangular planar shape. The AT-cut crystal element includes a first inclined portion, second inclined portions, and a first secured portion. The first inclined portion is inclined such that the crystal element decreases in thickness from a proximity of the first side to the first side. The second inclined portions are disposed on respective both ends of the first side, the second inclined portions being formed integrally with the first inclined portion. The second inclined portions are inclined gentler than the first inclined portion. The first secured portion and a second secured portion are formed integrally with the second inclined portion. The first secured portion and the second secured portion each project out from the first side to outside the crystal element to be used for securing with the securing members.


Patent
Nihon Dempa Kogyo Co. | Date: 2015-06-23

An oscillator detects a temperature of an atmosphere where a crystal resonator for an oscillation output is placed using a temperature detector to stabilize the temperature by controlling a temperature of a heater based on a temperature detection value. The device includes a buffer amplifier interposed in a signal path of a control signal generated based on the temperature detection value, a heater disposed such that a collector and an emitter position between a power source unit and a ground and constituted of a transistor having a base connected to an output port of the buffer amplifier, and a first differential amplifier disposed to adjust a gain of the buffer amplifier to cancel voltage fluctuation of the power source unit and amplifying a difference between a voltage corresponding to the supply voltage and a preliminarily set voltage to input to a gain adjustment port of the buffer amplifier.


Patent
Nihon Dempa Kogyo Co. | Date: 2015-03-11

An ultrasonic probe having: an ultrasonic transmission and reception unit provided inside housing; and a drive device provided therein that encases a main sound transmission medium and swings the ultrasonic transmission and reception unit. The ultrasonic probe is characterized by: the drive device being a drive transmission mechanism that converts the rotation of a drive motor to swinging of the ultrasonic transmission and reception unit; all or part of the drive transmission mechanism comprising a gear mechanism; and preventing backlash in a meshing section of at least a pair of gears in the gear mechanism, by elastically impelling and pressing one pair of gears on to the other pair of gears by using compression springs.


Patent
Nihon Dempa Kogyo Co. | Date: 2015-06-12

A piezoelectric vibrating piece includes a vibrating piece body and at least a pair of excitation electrodes. The vibrating piece body includes a vibrator. The pair of excitation electrodes are formed on respective front surface and back surface of the vibrator. The vibrating piece body is a twice rotated quartz-crystal vibrating piece cut out parallel to an X-Z surface. The X-Z surface is rotated around a Z-axis of a crystallographic axis of a crystal and further rotated around an X-axis. The pair of excitation electrodes are collocated in a Z-axis direction determined by an X-axis. The X-axis is defined by counterclockwise rotation from a +X-axis direction around a Y-axis by 260 to 300. The pair of excitation electrodes are disposed inclined with respect to the Y-axis direction.


Patent
Nihon Dempa Kogyo Co. | Date: 2016-11-16

A sensing sensor includes a first vibrating region, a second vibrating region, an adsorbing film, a blocking layer, a wiring board, a channel forming member arranged to cover a region of the one surface side of the wiring board to form a channel. The adsorbing film is arranged such that the adsorbing film is located in a region including the central portion in the front-rear direction of the one vibrating region. Assuming that the front end portion of the vibrating region is P1, the front end portion of the adsorbing film is P2, and the central portion of the vibrating region is C, the front end portion of the adsorbing film P2 satisfies a relational expression expressed as follows: (a distance from C to P1)0.4(a distance from P1 to P2)(a distance from C to P1)0.8.


Patent
Nihon Dempa Kogyo Co. | Date: 2016-06-29

A piezoelectric device includes a crystal element, excitation electrodes, extraction electrodes, a base, and first and second wiring electrodes on the base and connected to the extraction electrodes. The crystal element is connectedly secured to the first wiring electrode with conductive adhesive at an end part at a side of the one side on one surface of the crystal element. The fixing and the wire bonding are performed such that a secured position with the conductive adhesive overlaps a bonding position on the crystal element side by the wire bonding in a crystal element thickness direction. The first wiring electrode is disposed at an end part at a side of one side of the base and has a planar shape and a size so as to planarly encompass at least a region formed by projecting a part where the conductive adhesive contacts the crystal element to the base side.


Patent
Nihon Dempa Kogyo Co. | Date: 2016-07-14

An crystal resonator includes a first oscillating circuit that oscillates a crystal resonator at a first frequency, a first impedance adjusting circuit that adjusts an impedance of a first oscillating system including the crystal resonator and the first oscillating circuit, a second oscillating circuit that oscillates the crystal resonator at a second frequency that is different from the first frequency, a second impedance adjusting circuit that adjusts an impedance of a second oscillating system including the crystal resonator and the second oscillating circuit, and a controlling circuit that controls the first impedance adjusting circuit and the second impedance adjusting circuit.


Patent
Nihon Dempa Kogyo Co. | Date: 2016-03-31

An AT-cut crystal element is provided. The AT-cut crystal element includes side surfaces intersecting with a Z-axis of a crystallographic axis of a crystal. At least one side surface of the side surfaces is constituted of three surfaces of a first surface to a third surface. Besides, a crystal resonator including the AT-cut crystal element, and a crystal unit including the crystal resonator are provided.


Patent
Nihon Dempa Kogyo Co. | Date: 2016-02-03

A solder material includes an alloy of at least five elements including Sn, Cu, Sb, and In, and 20 mass % or less of Ag. The solidus temperature of the solder material is higher than 290 C., the liquidus temperature of the solder material is 379 C. or less and is higher than the solidus temperature, and the temperature difference between the liquidus temperature and the solidus temperature is 70 C. or less.

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