Nihon Dempa Kogyo Co.

Tokyo, Japan

Nihon Dempa Kogyo Co.

Tokyo, Japan
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Patent
Nihon Dempa Kogyo Co. | Date: 2017-01-19

A crystal oscillator includes a surface mount type crystal unit and a mounting substrate. The surface mount type crystal unit includes a ceramic container. The surface mount type crystal unit has a rectangular shape as a planar shape. The mounting substrate includes a ceramic substrate on which an electronic component is mounted, the mounting substrate having a rectangular shape as a planar shape. The crystal oscillator has a structure where the surface mount type crystal unit and the mounting substrate are laminated, and both terminals of the surface mount type crystal unit and the mounting substrate are connected with a bonding material. The mounting substrate and the surface mount type crystal unit are connected in a positional relationship where a long side of the mounting substrate and a long side of the surface mount type crystal unit are orthogonal.


Patent
Nihon Dempa Kogyo Co. | Date: 2016-12-22

A piezoelectric vibrating piece includes a vibrating piece body including a vibrator and at least one pair of excitation electrodes formed on a front surface and a back surface of the vibrator. The vibrating piece body is a twice rotated quartz-crystal vibrating piece. The pair of excitation electrodes are arranged in a Z-axis direction determined by an X-axis and obliquely disposed with respect to the Y-axis direction. The X-axis is rotated by 260 to 300 counterclockwise about a Y-axis using a +X-axis direction as a reference. The pair of excitation electrodes are formed to have respective semicircle shapes including straight line portions extending in the X-axis direction and to be disposed in a state where the straight line portions overlapping with one another. The straight line portion of the excitation electrode includes an inclined portion that gradually decreases in thickness toward an end portion of the excitation electrode.


Patent
Nihon Dempa Kogyo Co. | Date: 2016-12-28

An AT-cut crystal element includes a crystal element having two side surfaces (namely, a Z-surface) intersecting with a Z-axis of a crystallographic axis thereof. At least one of the two side surfaces is constituted of three of first to third surfaces. The first to the third surfaces meeting following conditions: the first to the third surfaces intersect with one another in this order and formed by rotating a principal surface of the crystal element by predetermined angles; and expressing the angle of the first surface as 1, a length of the first surface as D, a thickness of a part of the crystal element having the principal surface as t, and M=D/t, and a conversion percentage as fn (M, (1)), the 1 and the M are set such that the conversion percentage fn (M, (1)) becomes a predetermined value Th or less.


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: 2016-12-23

A sensing sensor includes a wiring board, a piezoelectric resonator, a channel forming member, a case body, and a regulating portion. The case body houses the wiring board, the piezoelectric resonator, and the channel forming member. The case body includes a window faced to a region including the output terminal on the another surface side of the wiring board and an injection port supplying a supply liquid to the one end side of the channel. The regulating portion is disposed in the case body. The regulating portion regulates the wiring board from the one surface side when the wiring board is pressed from the another surface side. The piezoelectric resonator is pressed against the surrounding portion by the output terminal being pressed from the another surface side.


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.


A piezoelectric resonator for an ultrasonic transducer includes a piezoelectric vibrating body, a signal electrode, a ground electrode, multiple bottomed groove portions, and a ground common electrode. The piezoelectric vibrating body is constituted of a piezoelectric ceramics. Multiple bottomed groove portions are formed to expose the principal surface of the piezoelectric vibrating body in a slice direction along a scanning direction of the piezoelectric resonator on the signal electrode. The ground common electrode is formed on at least one end portion of an end surface of the piezoelectric vibrating body in the slice direction and adjacent to both end portions in the scanning direction. The groove portions separate the signal electrode into a plurality of the signal electrodes in the scanning direction, and the ground common electrode electrically connects electrodes at both ends out of the signal electrodes which are separated to the ground electrode.


A frequency adjustment method is provided for a piezoelectric resonator including a first vibrator, a second vibrator, a third vibrator, and a supporting portion. The second and the third vibrators connect to ends positioned along a vibration direction of a width-longitudinal mode in the first vibrator. The supporting portion is connected to two ends positioned along a vibration direction of the length-longitudinal mode in the first vibrator. The method includes: setting the second vibrator to a first region, a second region, and a third region along the vibration direction of the width-longitudinal mode; setting the third vibrator to a first region, a second region, and a third region along the vibration direction of the width-longitudinal mode; and performing the frequency adjustment by reducing or adding mass of at least one of the first region and the third region in each of the second vibrator and the third vibrator.


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.

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