403 results about "Quartz crystal resonator" patented technology

An electronic apparatus comprises a display portion and a plurality of oscillators, one of which is a quartz crystal oscillator comprising: a quartz crystal oscillating circuit comprising; an amplification circuit and a feedback circuit. For example, the feedback circuit is constructed by a quartz crystal resonator comprising vibrational arms and a base portion, and having novel shape and electrode construction. Also, the quartz crystal resonator is housed in a package. In addition, from a relationship of an amplification rate of the amplification circuit and a feedback rate of the feedback circuit, an output signal of the quartz crystal oscillating circuit having an oscillation frequency of a fundamental mode of vibration for the quartz crystal resonator can be provided with a frequency of high stability.

A quartz crystal resonator includes a quartz crystal resonator element having a main surface including an X axis (electrical axis) and a Z' axis of an inclination rotated at an angle (y) equal to or greater than 36.4 degrees and equal to or smaller than, 40.5 degrees from a Z axis (optical axis) around the X axis, a main vibrating portion vibrating at a predetermined resonance frequency (f) and a supporting portion integrally formed with the main vibrating portion in such a manner as to be formed peripherally to surround the main vibrating portion, and two covers having a thermal expansion coefficient equal to or greater than 6x10^-6 per degrees centigrade and equal to or smaller than 10x10^-6 per degrees centigrade and bonded to the supporting portion so as to sandwich the quartz crystal resonator element therebetween.

The invention relates to a gas sensor, in particular to a quartz crystal resonator which is sensitive to ethanol, and preparation and application thereof, comprising an AT-cut quartz wafer and a gold electrode fixed on the quartz wafer, wherein, the outer surface of the gold electrode and/or the quartz wafer is coated with an ionic liquid membrane. The resonator is applied to a conventional QCM sensor to prepare a QCM ethanol gas sensor, and the operation principle is the quartz crystal microbalance technology; the response frequency of the sensor is reduced with the fractional increase of the surface quality of the resonator caused by the absorption of the ethanol gas on the surface of a sensitive membrane of the quartz resonator, and the reduced value of the frequency and the concentration of the ethanol gas are linear. The gas sensor has the advantages of simple structure, small size, fast and real-time response, high sensitivity, good selectivity, no need of analog to digital conversion for the output of frequency signals, convenient batch production and the like, and is particularly suitable for measuring the concentration of the ethanol gas in the air in real time.

An AT cut quartz crystal resonator element includes a quartz crystal element piece having an exciting part formed from an AT cut quartz crystal plate in a rectangular shape having an X-axis direction of a quartz crystal set to a long side, and an exciting electrode formed on each of front and back main surfaces of the exciting part, in which each side surface in the longitudinal direction of the exciting part is composed of two faces, an m-face of a quartz crystal and a crystal face other than the m-face.

An electronic apparatus has a display portion and quartz crystal oscillators having different modes of vibration. Each of the quartz crystal oscillators has a quartz crystal oscillating circuit having a quartz crystal resonator. The quartz crystal resonator of one of the quartz crystal oscillating circuits is a width-extensional mode quartz crystal resonator capable of vibrating in a width-extensional mode. The width-extensional mode quartz crystal resonator has a vibrational portion, connecting portions disposed at ends of the vibrational portion, supporting portions connected to the vibrational portion through the connecting portions, and electrodes disposed on upper and lower surfaces of the vibrational portion. The quartz crystal oscillating circuit having the width-extensional mode quartz crystal resonator outputs a clock signal for operating the electronic apparatus to display time information at the display portion.

A quartz crystal resonator has a quartz crystal tuning fork base and quartz crystal tuning fork tines connected to the quartz crystal tuning fork base. Each of the quartz crystal tuning fork tines has opposite main surfaces, a groove formed in at least one of the main surfaces, and an electrode disposed in the groove formed in at least one of the main surfaces so that a merit value M₁ of a fundamental mode of vibration of the quartz crystal tuning fork resonator is greater than a merit value M₂ of a second overtone mode of vibration thereof. The merit values M₁ and M₂ are defined by the ratios Q₁/r₁ and Q₂/r₂, respectively, where Q₁ and Q₂ represent a quality factor of the fundamental mode of vibration and the second overtone mode of vibration, respectively, of the quartz crystal tuning fork resonator and r₁ and r₂ represent a capacitance ratio of the fundamental mode of vibration and the second overtone mode of vibration, respectively, of the quartz crystal tuning fork resonator. A piezoelectric constant e₁₂ of the the quartz crystal tuning fork resonator is within a range of 0.095 C/m² to 0.19 C/m² in the absolute value.

A quartz crystal resonator includes a quartz crystal resonator element, a thermistor, a second layer including a first principal surface and a second principal surface, and a third layer having a through hole. internal terminals are provided on the first principal surface side, and electrode pads are provided in a portion exposed from the through hole on the second principal surface side. The quartz crystal resonator element is attached to the internal terminals, and the thermistor is attached to the electrode pads. Two mounting terminals are provided on a first diagonal line on the third principal surface side of the third layer, and two mounting terminals are provided on a second diagonal line. At least one of the two electrode pads is connected to any one of the two mounting terminals on the second diagonal line through a first conductive film provided on an inner wall of the through hole.

A quartz crystal unit comprising a case having an interior space and a mounting portion in the interior space, and a quartz crystal resonator having a base portion and first and second vibrational arms, the quartz crystal resonator being vibratable in a flexural mode, a capacitance ratio r₁ of a fundamental mode of vibration of the quartz crystal resonator being less than a capacitance ratio r₂ of a second overtone mode of vibration thereof, a mounting arm protruding from the base portion and extending in a common direction with at least one of the first and second vibrational arms, the mounting arm being mounted on the mounting portion of the case, an electrode being disposed on a surface of the mounting arm and a surface in the interior space of the case, the electrode disposed on the surface of the mounting arm being connected to the electrode disposed on the surface in the interior space of the case.

The invention belongs to electron product checking device field, especially is an automatic checking and selecting machine for quartz crystal resonator. The invention provides a separator for quartz crystal resonator with low cost, high checking precise and high efficiency. The invention includes computer, network analyzer, testing software, TTL card, AD converting card, electromagnetic valve, testing head cylinder, single action filling cylinder, bracket automatic filling vibrating plate, container, sliding channel, automatic separating channel and material box, the internal surface of the automatic filling vibration plate on top of the container is arranged with three guiding block boards and two material back apertures. There has a material transmitting track on the aperture of the automatic filling vibration plate, the material transmitting track is connected to the sliding channel, and the sliding channel is connected to the automatic material separating channel.

In a method for manufacturing a quartz crystal resonator, the method comprising the steps of: forming a quartz crystal tuning fork resonator having a quartz crystal tuning fork base, and first and second quartz crystal tuning fork tines; forming at least one groove in at least one of opposite main surfaces of each of the first and second quartz crystal tuning fork tines so that a width of the at least one groove is greater than a distance in the width direction of the at least one groove measured from an outer edge of the at least one groove to an outer edge of the corresponding one of the first and second quartz crystal tuning fork tines; and forming a metal film on at least one of the opposite main surfaces of the first and second quartz crystal tuning fork tines so that an oscillation frequency of the quartz crystal tuning fork resonator is lower than 32.768 kHz.

Methods for sensing and building sensors provide for adding nanotubes to a sensor to improve characteristics such as the Q-factor associated with the sensor. Mass loading and damping characteristics of micromachined quartz crystal resonators on which a thin film of debundled single-walled carbon nanotube (SWNT) has been deposited are disclosed. An absolute mass sensitivity of ˜100 fg was experimentally measured by monitoring the continuous desorption of gases from SWNT surfaces in a vacuum ambient.

A quartz crystal resonator includes a quartz crystal resonator element, a thermistor, and a package base having a first principal surface and a second principal surface having an opposed surface relationship with each other, the quartz crystal resonator element is mounted on the first principal surface side, the thermistor is housed in a recessed section of the second principal surface side of the package base, a plurality of electrode terminals connected to the quartz crystal resonator element or the thermistor is disposed on the second principal surface side of the package base, and a distance in a first direction perpendicular to the first principal surface from a mounting surface of the electrode terminals to the thermistor is equal to or longer than 0.05 mm.

A resonator element capable of improving impact resistance is provided. A quartz crystal resonator element is a resonator element formed by etching a Z plate which is cut at predetermined angles with respect to the crystal axes of a quartz crystal. The quartz crystal resonator element includes a base, a pair of resonating arms extending from the base in the Y-axis direction, and a positive X-axis notch and a negative X-axis notch formed by notching the base in the X-axis direction. The positive X-axis notch is formed by notching the base from the negative side of the X axis towards the positive side so that the width of the positive X-axis notch increases as it approaches the outer circumference.

The invention provides a rectilinear manipulator for seal welding, which relates to the technical field of manipulators for carrying out resistance welding on metal for packaging electronic components. The rectilinear manipulator mainly comprises an X-direction rectilinear operating mechanism, a Y-direction parallel feeding mechanism, an elevating mechanism, a clamping mechanism, a line-arranging type material supporting mechanism and an operation control circuit, wherein the elevating mechanism and the clamping mechanism thereof are arranged on the X-direction rectilinear operating mechanism; and the clamping device is arranged on the elevating mechanism. The device of the invention can be used for better realizing the substitute of the manipulator for manual work, has concise and reasonable operation route, quick discharge, high efficiency and accuracy, and can be used for greatly improving the production quality and efficiency. The rectilinear manipulator is especially suitable for a resistance welding metal packaging machine of a quartz-crystal resonator, and also can be used for the resistance welding packaging machines of other electronic components.

The invention discloses a digital frequency type humidity sensor for measuring relative humidity of a gas, in order to solve the problem of digitization of the humidity sensor in the prior art. The invention utilizes the characteristic that the serial connection formed by a sensitive electrode and a quartz crystal resonator has a high-sensitivity impedance frequency modulation characteristic to directly convert the change of electrical properties of the sensitive electrode caused by the relative humidity change in a gaseous-phase environment into the oscillation frequency change of the sensor;the oscillation frequency is collected by a frequency counter and sent to a computer for processing; the sensor disclosed by the invention has the characteristics of high sensitivity, digital frequency output, high stability, and the like.

The invention relates to a quartz crystal resonator and a manufacture process thereof, belonging to the technical field of quartz crystal resonator structures. The quartz crystal resonator comprises a substrate (2), wherein a shell (1) is coated on the upper part of the substrate (2); the substrate (2), insulators (5) and a lead wire (6) are sintered to form a base; and the nail head of the lead wire (6) is arranged in the shell (1) by spot welding for supporting reeds (4) of a quartz wafer. The resonator is characterized in that the distance between outer ends of the two reeds (4) is 4.5mm or less, and the distance between centers of the two insulators (5) is 2.5mm or less; the height of the substrate (2) is 0.7mm or less, and the height of the quartz wafer is 4*1.8mm or less; and the press sealing mode is electric resistance welding encapsulation. The resonator realizes miniaturization of the quartz crystal resonator, combines the crystal technology of the surface mounted quartz crystal resonator and the press sealing technology of the lead carrying type quartz crystal resonator to produce small-size surface mount products of the quartz crystal resonator, and is a small-size surface mounting type quartz crystal resonator in the electric resistance welding mode.

A quartz crystal resonator includes a thermistor having electrodes and a quartz crystal resonator body having a package. The quartz crystal resonator body has a plurality of electrode terminals on a second principal surface of the package and the thermistor is placed at the second principal surface side of the package between the electrode terminals in a plan view or within a range surrounded by the electrode terminals. Both the electrode terminals of the quartz crystal resonator body and the electrodes of the thermistor are mounted on a substrate.

The invention relates to a surface mounted device (SMD) quartz-crystal resonator base and a processing method of the SMD quartz-crystal resonator base, and belongs to the technical field of quartz-crystal resonators. A monolayer ceramic substrate with through holes is used in the base. A peripheral metal ring platform and a support platform inside the ring are distributed on the upper surface of the ceramic substrate, and an electrode metal coating is arranged on the lower surface of the ceramic substrate. The processing method includes the following steps: first, using the monolayer ceramic substrate, punching the through holes and pouring conductive metal materials, second, coating the ceramic substrate on the upper surface and on the lower surface with metal at corresponding positions, third, printing a tungsten layer after the metal coating is dried, fourth, sintering the ceramic substrate, fifth, nickeling the ceramic substrate in an electrolytic mode and forming a nickel plating layer, sixth, processing a Fe-Co-Ni alloy ring, sintering the ring on the circular peripheral metal ring platform of the ceramic substrate to form a cavity, seventh, nickeling the finished product again and forming a nickel plating layer, eighth, gilding the ceramic substrate in an electrolytic mode and forming a gold plating layer. Due to the fact that metal coating layers are printed on the monolayer ceramic substrate and then a metal ring is sintered with braze, the SMD quartz-crystal resonator base has the advantages that effects of conduction, insulation and support are good, material cost is reduced, and requirements of low cost and miniaturization of quartz-crystal resonator are satisfied.