摘要:
A piezoelectric filter is one not changing in the holding position of resonator in spite of impulse, small in the number of parts, easy to assemble from one direction, small, thin, and stable in characteristic. For example, as shown in FIG. 7, on electrode patterns on a package 10 forming wiring electrode patterns 11, holding protrusions 13 for holding resonators, and partition boards 14 for positioning resonators, a rectangular plate type piezoelectric resonators 12 are adhered with conductive adhesive. The rectangular plate type piezoelectric resonators 12 and the package 10 are adhered and reinforced from above with a vibration absorbing member 15, and wiring is formed from above the resonators by a wire bonding 16, thereby wiring resonators in a ladder form. Or, as shown in FIG. 11, after forming electrode patterns 102 on a piezoelectric substrate 101, a rectangular plate resonator 104 is cut out from a piezoelectric substrate 101 by laser in a shape consecutive to the piezoelectric substrate 101 by the node of length expander mode, and the piezoelectric substrate 101 is enclosed by a spacer 106 and a sheet 107 from above and beneath.
摘要:
A piezoelectric filter is one not changing in the holding position a resonator in spite of impulse, small in the number of parts, easy to assemble from one direction, small, thin, and stable in characteristic. For example, as shown in FIG. 7, on electrode patterns on a package 10 forming wiring electrode patterns 11, holding protrusions 13 for holding resonators, and partition boards 14 for positioning resonators, a rectangular plate type piezoelectric resonators 12 are adhered with conductive adhesive. The rectangular plate type piezoelectric resonators 12 and the package 10 are adhered and reinforced from above with a vibration absorbing member 15, and wiring is formed from above the resonators by wire bonding 16, thereby wiring resonators in a ladder form. Or, as shown in FIG. 11, after forming electrode patterns 102 on a piezoelectric substrate 101, a rectangular plate resonator 104 is cut out from a piezoelectric substrate 101 by laser in a shape consecutive to the piezoelectric substrate 101 by the node of the length expander mode, and the piezoelectric substrate 101 is enclosed by a spacer 106 and a sheet 107 from above and beneath.
摘要:
A light-emitting device including a light-emitting element emitting excitation light for exciting a fluorescent body, a dispersion body having the fluorescent body dispersed therein, which fluorescent body emits fluorescent light having a wavelength different from that of the excitation light, and a lead frame holding the light-emitting element and the dispersion body, wherein at least a portion of the fluorescent light emitted from the fluorescent body in the dispersion body is output to the outside from a side of the dispersion body receiving the excitation light. With this, a light-emitting device having high light output efficiency and an illumination apparatus and a display apparatus using the light-emitting device are provided.
摘要:
A method for producing an acceleration sensor comprising an electromechanical transducer having a piezoelectric element includes providing at least two piezoelectric substrates where each has two opposing main surfaces. The piezoelectric element is formed by directly connecting one of the main surfaces of one of the at least two piezoelectric substrates with an opposing one of the main surfaces of another one of the at least two piezoelectric substrates. Supporters are provided to support the electromechanical transducer and are directly connected to the at least two piezoelectric substrates composing the piezoelectric element. Electrodes that extend continuously from the unconnected main surfaces of the at least two piezoelectric substrates composing the piezoelectric element to surfaces of the supporters are then formed.
摘要:
The piezoelectric transformer of the present invention has a piezoelectric element 109 mainly formed of a piezoelectric material, primary electrodes 101U and 101D which are formed on the piezoelectric element 109 and to which a voltage is applied, a secondary electrode 102 which is formed on the piezoelectric element 109 and from which a voltage higher than the voltage applied to the primary electrode is output, and a sensor electrode 103 which is formed on the piezoelectric element 109 and from which a voltage lower than the output voltage of the secondary electrode is output.
摘要:
A liquid jetting apparatus has a concave casing having an opened flat face, and a piezoelectric drive element for at least partly sealing the opened flat face to form a liquid reservoir to store a liquid, such as ink. The reservoir has a liquid injection port for injecting a liquid and a liquid jet port for jetting the stored liquid. The piezoelectric drive element is directly bonded to the open flat face.
摘要:
A piezoelectric transformer has;a rectangular plate having a principal direction coinciding with a longitudinal direction or a lateral direction, said plate being made of a piezoelectric material;one set of primary electrodes which are formed on faces of said rectangular plate, respectively, said faces being opposed to each other in a thickness direction; andone set of secondary electrodes which are formed on said rectangular plate, whereinat least one of said primary electrodes covers a center portion of said rectangular plate with respect to said principal direction, and is disposed so as not to overlap with end portions of said rectangular plate with respect to said principal direction,each of said secondary electrodes consists of a single electrode member, andan AC voltage applied between said primary electrodes causes said rectangular plate to produce such a mechanical vibration of a half wave length that said rectangular plate expands and contracts in said principal direction, thereby outputting a voltage from said secondary electrodes.
摘要:
An ultrasonic motor has a vibrating body 3 and a moving body 11 supported by a supporting component 7. A rounded lower end of the supporting component is supported in a tapered dent of a supporting base 10, and therefore when a side pressure is applied, it inclines to the supporting base so as to keep the contact between the vibrating body and moving body stable. As a result, a stable motor rotation is always obtained regardless of side pressure. A lead wire 8 is held between a metal elastic element 1 and supporting component, and is pressed against the elastic element. Hence, the lead wire, through contact with the elastic element, is electrically coupled to the common electrode on the upper surface of a piezoelectric element without soldering and without use of conductive resin.
摘要:
An inverter power source apparatus using a piezoelectric transformer, has: variable oscillating device for oscillating a pulse signal; pulse-width changing device for changing a width of said pulse signal of said variable oscillating device; driving device for generating a driving signal on the basis of an output of said pulse-width changing device; a piezoelectric transformer which is driven by said driving signal, drives a predetermined load, and has input and output electrodes; detecting device for detecting a relationship between said driving signal and a resonance frequency of said piezoelectric transformer, and for, on the basis of a result of the detection, controlling a frequency of said oscillation signal of said variable oscillating device so that a difference between said resonance frequency and a frequency of said driving signal is substantially within a preset range; and pulse-width controlling device for, when a detection results of said detecting device shows that said difference between said resonance frequency and said frequency of said driving signal is substantially within said preset range, controlling said pulse-width changing device so that a current flowing through said load is substantially constant.
摘要:
In an ultrasonic motor wherein an elastic travelling wave is excited in a vibrating stator comprising a piezoelectric element and an elastic element thereby to drive and a rotor which is disposed to touch the vibrating stator with pressure by friction forces, an ultrasonic motor having high efficiency is obtained. In the present invention, the above-mentioned vibrating stator is substantially disk-type, electrodes being provided to the piezoelectric element are disposed in a form of two sets of concentric circles having different phases with respect to each other in a circumferential direction in which the vibration is travelling, and have a constitution which excites the vibrating stator by flexural vibration modes of second order or higher in a radial direction and of third order or higher in the circumferential direction, and also, are designed so that at least mechanical impedances seen from each electrode become equal. By superimposing standing waves of the flexural vibration which are excited by those two sets of electrodes, the flexural vibration is made to travel in the circumferential direction, thereby to obtain a driving force.