Tokyo, Japan
Tokyo, Japan

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Patent
Nihon Dempa Kogyo Co. | Date: 2015-05-18

During normal and reverse swings of a transducer main body, an engagement accuracy is ensured to reduce generation of vibration and noise. An ultrasonic transducer includes: a coupling 2 swingably and loosely fitted between one end portion of an output shaft 1a of a power source 1 that swings the transducer main body and the transducer main body, and a flywheel 3 swingably and loosely fitted to another end portion of an output shaft 1b of the power source 1, ensuring the reduced vibration and noise from the transducer main body.


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: 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.


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

An oscillator includes a front side voltage divider, a rear side voltage divider, and an oscillation unit. The front side voltage divider includes a first resistor connected between a first and second potential sources, and a first output terminal configured to changeably connect to a connection position in the first resistor so as to vary an obtained output voltage. The rear side voltage divider includes a second resistor connected between the first output terminal and a third potential source; and a second output terminal configured to changeably connect to a connection position in the second resistor so as to vary an obtained output voltage. The oscillation unit includes a variable capacitance element with a capacitance varied according to the output voltage from the second output terminal. The oscillation unit varies an output frequency based on a variation in a resonance point associated with a variation in the capacitance.


Patent
Nihon Dempa Kogyo Co. | Date: 2015-03-04

An oven controlled crystal oscillator that ensures reduced heat influence from outside to further stabilize an output frequency is provided. The oven controlled crystal oscillator includes a substrate secured above a base. The oven controlled crystal oscillator includes an oscillator circuit, a heater resistor, and a power transistor, which are mounted on the substrate. The oven controlled crystal oscillator includes pins that secures the substrate above the base at a predetermined interval, a metal cover that covers the oscillator circuit, the heater resistor, and the power transistor, and a resin cover that covers outside of the metal cover. An air layer is formed between the metal cover and the resin cover.


Patent
Nihon Dempa Kogyo Co. | Date: 2015-03-20

Providing an OCXO having a highly stabilized output frequency. In an oscillator, which is an OCXO, crystal resonators, oscillator circuits, a temperature detector, and a heater circuit are disposed inside a first container, which is supported in a state of floating inside a second container, while a voltage stabilizer circuit for stabilizing a supply voltage supplied to the heater circuit is disposed apart from the first container inside the second container. Therefore, the supply voltage supplied to the heater circuit is stabilized. The voltage stabilizer circuit is less likely to be affected by heat generation of the heater circuit, thus obtaining a stable oscillation frequency output regardless of the environmental temperature.

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