| Patent Number |
Title Of Patent |
Date Issued |
| RE33957 |
High frequency narrow-band multi-mode filter |
June 9, 1992 |
| A high frequency narrow-band pass multi-mode filter in constructed in such manner that SAW of SSBW resonators are closely disposed to each other on a single piezoelectric substrate to generate different vibration modes of different resonance frequencies, conditions that the resonators ar |
| D477349 |
Sorter |
July 15, 2003 |
|
| D389828 |
Portable telephone |
January 27, 1998 |
|
| D359736 |
Beeper |
June 27, 1995 |
|
| D359616 |
Beeper holder |
June 27, 1995 |
|
| 7388445 |
Piezoelectric oscillator for quadrature modulation |
June 17, 2008 |
| A quartz oscillator for quadrature modulation has a quartz oscillating circuit including a transistor, a quartz oscillator, a capacitor, and a resistor, a double-mode quartz filter, a reactance element, and an amplifier. The quartz oscillator is constituted so that an output of the q |
| 7235913 |
Piezoelectric substrate, piezoelectric resonating element and surface-mount piezoelectric oscill |
June 26, 2007 |
| In the case where an ultraminiature piezoelectric substrate, which has a resonating portion formed by making a concavity by etching in the surface of the piezoelectric substrate made of an anisotropic crystal material, is mass-produced by batch operation using a large-area piezoelectric |
| 7230502 |
Emitter coupled logic oscillator circuit |
June 12, 2007 |
| In a piezoelectric oscillator a non-inverted output terminal (3) of an ECL circuit (10) is grounded via a capacitor (C3) and is connected to a non-inverting input terminal (5) of the ECL circuit (10) via a series connection of capacitors (C4) and (C5). The non-inverting input (5) is |
| 7224661 |
Wave plate and optical pickup unit using the same |
May 29, 2007 |
| As a 1/2 wave plate constituted by laminating two wave plates, a wave plate where temperature dependence of a phase difference is reduced is provided. In a wave plate constituted by laminating a first wave plate having a phase difference .tau..sub.1 (deg.) and an optical axis azimuth |
| 7205856 |
Piezoelectric oscillator |
April 17, 2007 |
| A piezoelectric oscillator including a piezoelectric vibrator that vibrate at desired frequency; a first transistor for exciting the piezoelectric vibrator; a second transistor whose collector connects to an emitter of the first transistor, the second transistor being a base grounded typ |
| 7183125 |
Method for manufacturing surface acoustic wave device |
February 27, 2007 |
| To provide a high quality SAW device with enhanced productivity, wherein an outer face of a SAW chip mounted on a mounting substrate is covered with a heat-softened resin sheet and resin is filled on the SAW chip to form an airtight space below an IDT in the SAW device. A method for |
| 7183124 |
Surface mount saw device manufacturing method |
February 27, 2007 |
| With a surface mount SAW device constituted so that an outer surface of a SAW chip is covered with a heated and softened sheet resin, a resin is filled into skirts of the SAW chip, and so that an airtight space is thereby formed below IDT electrode on a lower surface of the SAW chip, it |
| 7173499 |
High-stability piezoelectric oscillator |
February 6, 2007 |
| Design means is provided to prevent electronic parts used in a high-stability piezoelectric oscillator from deterioration due to aging by heat when the high-temperature side of the working temperature range is as high as 85.degree. C. A high-stability piezoelectric oscillator, which |
| 7109814 |
Piezoelectric oscillator |
September 19, 2006 |
| In a Colpitts quartz oscillation circuit, large negative resistance values are obtained in a high frequency band, and in the GHz band in particular. In a piezoelectric oscillator having a Colpitts oscillator, a voltage control circuit, and a coupling capacitor that couples the Colpitts |
| 7098574 |
Piezoelectric resonator and method for manufacturing the same |
August 29, 2006 |
| In the case where an ultraminiature piezoelectric substrate, which has a resonating portion formed by making a concavity by etching in the surface of the piezoelectric substrate made of an anisotropic crystal material, is mass-produced by batch operation using a large-area piezoelectric |
| 7088192 |
Inverter oscillator circuit |
August 8, 2006 |
| In an inverter oscillation circuit an output terminal 2 of an inverter 1 with its input and output interconnected via a high resistance R1 is grounded via a series connection of a capacitor C1 and parallel tuning circuit composed of a capacitor C2 and an inductor L1 connected in para |
| 7071598 |
Thin and highly stable piezoelectric oscillator, and thin and surface-mounting type highly stabl |
July 4, 2006 |
| A thin and highly stable piezoelectric oscillator is provided with a piezoelectric vibrator, a mother printed board which supports a piezoelectric vibrator main body on its one face and connects lead terminals to a wiring pattern, oscillating circuit parts which are mounted on one fa |
| 7038359 |
Piezoelectric resonator and the method for making the same |
May 2, 2006 |
| The present invention provides a method for making high-frequency piezoelectric resonators so that constants of the resonator can be measured precisely. A cavity is formed at a central section of an AT-cut crystal substrate. Two grooves are formed at predetermined distances from the |
| 7023288 |
Piezoelectric oscillator and its manufacturing method |
April 4, 2006 |
| A piezoelectric oscillator comprising a piezoelectric vibrator with a piezoelectric vibrating element housed in a package and bottom terminals formed on the outer side of the bottom of the package, a circuit board with at least one electronic circuit component mounted and conductor p |
| 7012353 |
Piezoelectric resonator and the method for making the same |
March 14, 2006 |
| The present invention provides a method for making high-frequency piezoelectric resonators so that constants of the resonator can be measured precisely. A cavity is formed at a central section of an AT-cut crystal substrate. Two grooves are formed at predetermined distances from the |
| 7009459 |
Piezoelectric oscillator having a non-inductive load with a collector-emitter capacitor |
March 7, 2006 |
| A piezoelectric oscillation circuit has a series circuit composed of a capacitor Cbe as a part of a load capacitance and a capacitor Ce inserted and connected between a base of an oscillation transistor TR1 and the ground, and has an emitter resistor Re connected to a connection midpoint |
| 7005934 |
Crystal oscillator with temperature compensated through a vibrator current control circuit |
February 28, 2006 |
| The invention provides a temperature compensated crystal oscillator that can obtain a large variable range and that can obtain high temperature stability. This temperature compensation system employs a configuration comprising a oscillation circuit 12 including a crystal vibrator 11 |
| 6995623 |
Piezoelectric oscillator |
February 7, 2006 |
| The present invention has for its object to provide a piezoelectric oscillator that has improved secular variation characteristics and excels in suppressing undesired resonance. The piezoelectric oscillator has a piezoelectric vibrator and an oscillation transistor, and since a colle |
| 6963600 |
Adaptive interference-free spread-spectrum system employing binary code sequence sets with zero |
November 8, 2005 |
| A direct sequence spread spectrum system consisting of modulator and demodulator wherein the spreading sequence with zero correlation zone properties, and the despreading consists of multiplying the received signal with the same spreading sequence, followed by a low pass filter, deco |
| 6954422 |
Comb-form spectrum communication systems using repeated complementary sequence modulation |
October 11, 2005 |
| In comb-form spectrum communication systems using repeated complementary sequence modulation, a transmitting signal is constituted by assigning one set of N auto-complementary sequences to each user, where N is an integer equal to or higher than 2, and by transforming the N sequences to |
| 6949983 |
High-frequency piezoelectric oscillator |
September 27, 2005 |
| In the high-frequency piezoelectric oscillator, capacitors C1, C2 as a part of a load capacitor are connected between a base of a transistor TR1 and the ground. The connection point of the capacitors C1, C2 is connected to an emitter of the transistor TR1, and is grounded via an emitter |
| 6915694 |
Double-ended tuning fork vibratory gyro-sensor |
July 12, 2005 |
| The object of the present invention is to provide an angular velocity sensor that uses Coriolis force with a flatly supported double tuning fork structure that uses an in-plane asymmetrical flexural secondary mode. A large support area is used to provide a high-precision angular velocity |
| 6859110 |
High-stability piezoelectric oscillator |
February 22, 2005 |
| [Object of the invention] To provide designing means that prevents deterioration through thermal aging of an electronic part used in high-stability piezoelectric oscillators and the like when the high end of the usage temperature is 85 deg C.[Means for solving the problem] In a high-stab |
| 6791424 |
Piezoelectric oscillator |
September 14, 2004 |
| Piezo oscillators having a quick start-up circuit, which applies a start-up quickening voltage to the piezo resonator only for a predetermined length of time after the application of power supply voltage, added to a piezo oscillating circuit. The start-up time taken for the piezo oscilla |
| 6750593 |
High frequency piezoelectric resonator having reduced spurious modes |
June 15, 2004 |
| Disclosed is a piezoelectric resonator that has a piezoelectric plate that has formed thereon a pair of main electrodes and has formed thereon a second electrode surrounding the peripheral edge of the main electrode with a gap being provided between the second electrode and a peripheral |
| 6734747 |
Piezoelectric oscillator |
May 11, 2004 |
| A piezoelectric oscillator is disclosed which falls under the category of an oscillator including a piezoelectric resonator, an amplifier, and a variable-capacitance element. The variable-capacitance element is a MOS construction type capacitance element, one terminal of that is fixed at |
| 6629342 |
Method for producing an AT-cut resonator |
October 7, 2003 |
| In an AT-cut quartz resonator having excitation electrodes formed on two principal surfaces of an AT-cut quartz substrate, the two electrodes are displaced a predetermined amount apart in a direction orthogonal to the X-axis direction so that a frequency deviation in a temperature range |
| 6617756 |
Piezo-oscillator |
September 9, 2003 |
| In order to realize a small quartz oscillator having high frequency stability and capable of measuring DLD characteristics, in a piezo-oscillator comprising an oscillator circuit including a piezo-vibrator and an amplifier circuit, and a constant-voltage circuit, in which a power sou |
| 6504454 |
Longitudinally coupled surface acoustic wave filter |
January 7, 2003 |
| In a filter in which first-order to third-order. double mode SAW filters each including three IDT electrodes having an electrode finger pitch L1 are cascaded, to flatten the passband of the filter and reduce the VSWR to 2 or lower, a pitch of electrode fingers of the IDT electrode in the |
| 6492759 |
Piezoelectric resonator and a filter |
December 10, 2002 |
| A piezoelectric resonator has a piezoelectric substrate on obverse and reverse surfaces of which electrodes are disposed. Comb-shaped electrodes consisting of electrode fingers and spaces are disposed around the electrode situated at least on one surface of the piezoelectric substrate |
| 6484192 |
Root finding method and root finding circuit of quadratic polynomial over finite field |
November 19, 2002 |
| There is provided a root finding circuit of a quadratic polynomial over a finite field, capable of operating at high speed and making the circuit scale in implementation small.The root finding circuit includes m-3 cascade-connected exclusive OR gates X(1, 0) to X(1, m-4) each supplied wi |
| 6448689 |
Piezoelectric oscillator |
September 10, 2002 |
| The piezoelectric oscillator is a Colpitts circuit including a piezoelectric vibrator and a load capacitance in the oscillating loop and a limiter circuit. The excitation signal from the piezoelectic vibrator is supplied to the limiter circuit, and the limiter circuit controls the in |
| 6421367 |
Two-phase/four-phase modulated comb-shaped spread spectrum communication system |
July 16, 2002 |
| When communications are performed between a transmitter 2 and a receiver 3 via a transmission path 4, the transmitter prepares a basic sequence consisting of two-phase or four-phase tips, and transmits an expanded transmission frame which is constructed by repeatedly arranging one or a |
| 6402834 |
Apparatus and method for manufacturing monocrystals |
June 11, 2002 |
| In a monocrystal producing device using a pulling-down method, a raw material melt 5m is continuously supplied into a crucible 2 to grow a crystal 18 by supplying a powdery raw material 5p onto a premelt plate 3 inside an electric furnace 10 with a powdery raw material supplying device |
| 6369674 |
Broad-band surface acoustic wave filter with specific ratios of transducer electrode period to r |
April 9, 2002 |
| In a longitudinally coupled multi-mode surface acoustic wave filter, for the purpose of setting a stop band width of reflectors to a proper width according to a required filter, since a line occupation rate of the reflectors has been made smaller than a line occupation rate of an IDT |
| 6329888 |
Reflection inversion surface acoustic wave transducer and filter |
December 11, 2001 |
| A surface acoustic wave transducer is provided having three electrode fingers disposed as one reference segment (.lambda.) on a piezoelectric substrate, each segment including an electrode finger 1 having a width W1, an electrode finger 2 having a width W2 with a gap of g1, and an electr |
| 6294964 |
High-stability piezoelectric oscillator |
September 25, 2001 |
| To obtain means for suppressing a jump phenomenon to a B mode in a Colpitts oscillator using an SC-cut crystal unit. In a Colpitts oscillator including a piezoelectric resonator and an amplifier circuit, a series resonance circuit and a parallel resonance circuit consisting of an ind |
| 6271734 |
Piezoelectric oscillator |
August 7, 2001 |
| A piezoelectric oscillator which is excellent in noise characteristic and aging characteristic is implemented by a piezoelectric oscillator comprising: a Colpitts oscillator including a piezoelectric resonator and an oscillation transistor; amplification means for amplifying an output of |
| 6147565 |
Piezo-oscillator with heater and temperature control circuit |
November 14, 2000 |
| There are disposed on a printed substrate a crystal resonator as a piezoelectric resonator, an oscillation circuit, a plurality of surface mount heaters and a temperature controlling circuit for controlling a heating temperature of the heaters. A case of the piezoelectric resonator a |
| 6138134 |
Computational method and apparatus for finite field multiplication |
October 24, 2000 |
| A method and a circuit for multiplication on a finite field which operate fast and involve a small circuit scale. There is provided a multiplication circuit on a finite field for multiplication of two arbitrary elements a=(a.sub.0, a.sub.1, . . . , a.sub.m-1) and b=(b.sub.0, b.sub.1, . . |
| 6114801 |
At-cut crystal resonator |
September 5, 2000 |
| In an AT-cut quartz resonator having excitation electrodes formed on two principal surfaces of an AT-cut quartz substrate, the two electrodes are displaced a predetermined amount apart in a direction orthogonal to the X-axis direction so that a frequency deviation in a temperature range |
| 6111341 |
Piezoelectric vibrator and method for manufacturing the same |
August 29, 2000 |
| In a piezoelectric vibrator which has excitation electrodes respectively disposed on the top surface and undersurface of a piezoelectric substrate, at least one of the excitation electrodes being an inverted-mesa electrode that has a recess formed in the opposite side of the electrode fr |
| 6052353 |
Double refraction plate with refractive grating pattern around a centerally disposed transparent |
April 18, 2000 |
| An optical element has a diffraction grating pattern formed on a double refracting thin plate around a centrally-disposed region of a desired shape. The diffraction grating pattern is composed of equally spaced ion exchange regions each having a predetermined width, a predetermined lengt |
| 5794126 |
Emergency positioning indicating radio buoy having a thermally insulated frequency standard |
August 11, 1998 |
| An emergency positioning indication radio buoy used in case of emergency by being thrown into the sea from a ship. This radio buoy comprises a transmitting unit for generating a high frequency signal of a predetermined frequency, a battery for supplying the power to the transmitting |
| 5771249 |
ATM cell synchronous system |
June 23, 1998 |
| An asynchronous transfer mode (ATM) cell synchronizing method and circuit used in a digital network system in which: an 8 bit ATM cell stream of a received signal is inputted into a five-stage D flip-flop and outputted to a first adder (exclusive OR) circuit through a remainder operation |
