Patent application number | Description | Published |
20140184021 | PIEZOELECTRIC STACK TRANSDUCER - Provided is a piezoelectric stack transducer. In a transducer portion, a plurality of piezoelectric transducers which output maximum amplitude at different frequencies are continuously stacked. A stacked electrode portion is provided on both surfaces of each of the plurality of continuously stacked piezoelectric transducers and supplies an electric signal so that vibration is generated. In this case, the plurality of piezoelectric transducers have different diameters. According to the present invention, it is possible to implement a piezoelectric stack transducer which exhibits constant amplitude (output) at different frequencies by piezoelectric transducers exhibiting different amplitudes at respective frequencies according to natural frequencies supplementing amplitude of a different piezoelectric transducer. | 07-03-2014 |
20150052981 | APPARATUS AND METHOD FOR MEASURING THE VISCOSITY OF A FLUID USING ULTRASONIC WAVES - A method for measuring an ultrasonic viscosity includes applying a driving voltage to a plurality of first piezoelectric transducers provided along an outer wall circumference of a pipe at constant intervals to generate a torsional wave on a surface of the pipe, receiving the torsional wave propagated along the surface of the pipe through a plurality of second piezoelectric transducers provided along the outer wall circumference of the pipe at constant intervals while being spaced from the first piezoelectric transducers at a certain distance in a longitudinal direction of the pipe to convert the torsional wave into a voltage signal, calculating an attenuation and a propagation velocity of the torsional wave based on the time for the propagation of the torsional wave and the converted voltage signal, and measuring viscosity of the fluid in the pipe based on the calculated attenuation and propagation velocity of the torsional wave. | 02-26-2015 |
20150054637 | WARNING ALARM APPARATUS AND METHOD FOR STEERING WHEEL - A warning alarm apparatus for a steering wheel includes at least one piezoelectric transducer provided in the rim of the steering wheel; a current supplier; one or more sensors, equipped in the steering wheel or a motor vehicle, sense a dangerous factor; and a controller that determines whether a sensor value sensed by the sensor is included in a warning alarm range, and controls operation of the current supplier according to the sensor value. | 02-26-2015 |
20150062559 | HANDHELD TACHOMETER - A handheld tachometer includes a body that controls light output, and calculates a rotational velocity of an object based on incident light reflected from the object, and a reflector that is positioned at a light output terminal of the body, to adjust an angle of output light or incident light. The reflector can be adjusted by driving a step motor. The body may also have a motor control interface for a user to adjust the driving direction and degree of the step motor. | 03-05-2015 |
20150115775 | PIEZOELECTRIC POWER GENERATOR USING WIND POWER - A piezoelectric power generator using wind power is provided. To elaborate, the piezoelectric power generator has a central axis unit with a charger, a piezoelectric film supporting frame engaged onto an outer circumference surface of the central axis unit, and a piezoelectric film having a pre-set area and at least one side engaged to at least one of one side part of the piezoelectric supporting frame and the central axis unit. In addition, the piezoelectric film supporting frame has a shape corresponding to a shape of an edge of the piezoelectric film to surround the edge of the piezoelectric film. | 04-30-2015 |
20150314604 | APPARATUS FOR PREVENTING CLOGGING OF PRINTER NOZZLE AND PRINTER INK CARTRIDGE - A printer nozzle apparatus, including a nozzle that sprays ink, at least one vibration unit that is arranged on one surface of the nozzle and of a ring shape, and a controller that controls a vibration frequency of the vibration unit. | 11-05-2015 |
20160025538 | FLOWMETER SYSTEM - In one example embodiment, there is provided a flowmeter system. The flowmeter system includes a high temperature transferring part that collects external heat energy to transfer the heat energy; a low temperature transferring part that transfers heat energy of an intake pipe; a stirling engine that produces a power based on a temperature difference between the heat energy transferred from the high temperature transferring part and the heat energy transferred from the low temperature transferring part; and a flowmeter that is supplied with the power produced by the stirling engine to measure a flow rate of the intake pipe | 01-28-2016 |
20160097663 | FLOWMETER USING ULTRASONIC TRANSDUCER - There is provided a flow meter using at least one ultrasonic transducer. The flow meter includes an ultrasonic transducer, a wedge that has a sloped surface formed on a top portion of the wedge and oblique with respect to a downward direction, and a dented portion formed in a half-cylinder shape along a longitudinal direction of the sloped surface; and a rotation portion that has a plane section where the ultrasonic transducer is positioned, and a curved section extended from two opposite edges of the plane section and curved in a semicircular shape to be contacted with the dented portion. | 04-07-2016 |