Korea Electronics Technology Institute

Samsung Sdi Co., Inc.

Cheil Industries Inc.

Seung Ho Han

Hyung Won Kang

Hwan Sung Cheon

Min Gyum Kim

Dong Hwan Lee

Jin Min Cheon

Jung Seob Kim

Myong Jae Yoo

Chan Sei Yoo

In Tae Seo

Eun Jung Lee

Hyeung-Gyu Lee

Hyeung Gyu Lee

Woo Chul Na

Woo Sung Lee

Hwi Yeol Park

Kyu Sung Cho

Yun Ling

Sung Su Park

Intae Seo

Hyunseung Yang

Sang Taek Han

Ju Mi Kim

Disclosed is a method for manufacturing a laminated piezoelectric composite. The method includes wet-mixing ceramic powder, a polymer binder, a plasticizer and a solvent for 4 to 72 hours so as to generate a mixed slurry, introducing the mixed slurry into a tape casting process so as to prepare a plurality of piezoelectric composite sheets, drying and forming the plurality of piezoelectric composite sheets using a roll-to-roll process so as to prepare the plurality of formed piezoelectric composite sheets, forming internal electrodes on the plurality of piezoelectric composite sheets so as to prepare the plurality of piezoelectric composite sheets having the internal electrodes, laminating and pressing the plurality of piezoelectric composite sheets having the internal electrodes so as to generate a piezoelectric composite sheet laminate having the internal electrodes, and cutting the piezoelectric composite sheet laminate having the internal electrodes into a desired shape and size.

Method for manufacturing flexible laminated piezoelectric composite

A stack-type piezoelectric element is implemented with a reduced capacitance value without a reduction in displacement amount. The stack-type piezoelectric element includes a piezoelectric layer formed of a piezoelectric material, and electrode layers formed in and on the piezoelectric layer and including at least one internal electrode layer formed inside the piezoelectric layer. Each of the at least one internal electrode layer includes a plurality of split electrodes that are separated and arranged in a longitudinal direction. A piezoelectric actuator including the stack-type piezoelectric element is also provided.

Stack-type piezoelectric element and piezoelectric actuator including the same

A method of forming an electrode in a ceramic transducer electronic component is provided. The method includes preparing a sintered body for a ceramic transducer containing a metal oxide, performing patterning by irradiating a laser on a surface of the sintered body for a ceramic transducer, and forming a metal electrode by performing an electroless plating process on the sintered body for a ceramic transducer on which the patterning is formed, wherein, in the performing of the patterning by irradiating the laser on the surface of the sintered body for a ceramic transducer, the patterning is performed by irradiating the laser that satisfies at least one of a predetermined power condition and a predetermined processing speed condition.

Method of forming an electrode in a ceramic transducer electronic component

Proposed is a method of manufacturing a piezoelectric composite material. The method includes the steps: wet mixing the ceramic powder, the polymer binder, the plasticizer, and the solvent for 4 to 72 hours to produce the mixed slurry, in which the amount of the polymer binder in the mixed slurry is 3 to 10 parts by weight, the amount of the plasticizer is 0.1 to 3 parts by weight, and the amount of the solvent is 30 or more to less than 50 parts by weight, based on 100 parts by weight of the ceramic powder in the mixed slurry; introducing the mixed slurry into a tape casting process to produce a piezoelectric composite sheet; drying and molding the piezoelectric composite sheet in a roll-to-roll process to form a molded piezoelectric composite sheet; laminating and compressing piezoelectric composite sheets molded to produce piezoelectric composite sheet laminates; and cutting the piezoelectric composite sheet laminate into the desired shape and size.

Method of manufacturing flexible large-area piezoelectric composite materials

A device includes: a controller configured to output a contactor control signal for controlling an operation of a contactor; a system basis unit configured to monitor a state of the controller and to output a safety detection signal; an operation maintaining unit including a first level shifter configured to shift a voltage level of the safety detection signal, a second level shifter configured to shift a voltage level of the contactor control signal, a retention output unit configured to compare the voltage level of the first level shifter with the voltage level of the second level shifter and to output a retention output signal, and a timer output unit configured to output a timer output signal to output the retention output signal for a preset time; and a contactor driver configured to output a contactor driving signal based on the contactor control signal and the retention output signal.

Device for maintaining operating state of contactor

A method of manufacturing a magnetoelectric composite material having a 0-3 type connectivity is provided. The manufacturing method includes manufacturing a slurry including an alignment material including one material selected from among a magnetostrictive material and a piezoelectric material. The slurry further comprises a seed composition comprising the other material from the magnetostrictive material and the piezoelectric material. The method further comprises molding the manufactured slurry to manufacture a molding material, and plasticizing and firing the molding material.

Magnetoelectric composite material and method of manufacturing the same

A magnetoelectric energy harvester having excellent power generation performance and a manufacturing method thereof are provided. The magnetoelectric energy harvester includes a magnetostrictive material portion including a magnetostrictive material which generates a mechanical deformation when being magnetized. The magnetoelectric energy harvester also includes a piezoelectric material portion which has a bending vibration mode and includes a piezoelectric material which produces power by receiving a mechanical deformation force from the magnetostrictive material portion.

Magnetoelectric energy harvester and manufacturing method thereof

The present invention relates to a compound containing phosphonium ion of a chemical formula 1, an epoxy resin composition containing the same, and a device manufactured by using the same.

Compound containing phosphonium ion, epoxy resin composition containing same, and device manufactured by using same

The present invention relates to a pyridinium-based compound of chemical formula 1, an epoxy resin composition comprising the same, and an apparatus manufactured by using the same.

Pyridiniuivi-based compound, epoxy resin composition comprising same, and apparatus manufactured using same

The present invention relates to a curing catalyst for an epoxy resin composition represented by chemical formula 1, an epoxy resin composition comprising the same, and an apparatus manufactured using the same.

Curing catalyst for epoxy resin composition, epoxy resin composition comprising same, and apparatus manufactured by using same

An epoxy resin composition includes: an epoxy resin; a curing agent; a curing accelerator; and an inorganic filler, wherein the curing accelerator includes a 4-valent ammonium salt or a 4-valent phosphonium salt represented by Formula 1, wherein Ais nitrogen or phosphorus; R, R, Rand Rare each independently a substituted or unsubstituted Cto Chydrocarbon group, or a substituted or unsubstituted Cto Chydrocarbon group including a hetero atom; X, X, X, X, Xand Xare each independently an oxygen atom (O), a sulfur atom (S), or NH; and Y, Yand Yare each independently a substituted or unsubstituted Cto Chydrocarbon group, or a substituted or unsubstituted Cto Chydrocarbon group including a hetero atom.

Epoxy resin composition for encapsulating semiconductor device and semiconductor device encapsulated using the same

A piezoelectric generator for power supply of a portable terminal is provided. The piezoelectric generator includes: a portable terminal case which has a battery mounting part formed on one surface thereof and has parts of the portable terminal mounted therein; a slide part which is formed on opposite side surfaces of a border of the portable terminal case to be able to slide up and down; and a piezoelectric body which has one end or opposite ends connected with the slide part and is disposed in the battery mounting part in a transverse direction, and which vibrates by a sliding movement of the slide part.

Piezoelectric generator for supplying power to portable terminal

A quaternary phosphonium salt, an epoxy resin composition including the quaternary phosphonium salt, and a semiconductor device encapsulated with the epoxy resin composition, the quaternary phosphonium salt being represented by Formula 1: 

Quaternary phosphonium salt, epoxy resin composition for encapsulating semiconductor device and including the quaternary phosphonium salt, and semiconductor device encapsulated with the epoxy resin composition

An epoxy resin composition includes an inorganic filler, an epoxy resin, and a curing agent. The inorganic filler has an average particle diameter D50 from about 2 &#x3bc;m to about 10 &#x3bc;m, an average particle diameter D10 of about 3 &#x3bc;m or less, and an average particle diameter D90 from about 6 &#x3bc;m to about 15 &#x3bc;m. Inorganic filler particles having a particle diameter of about 25 &#x3bc;m or more constitute about 0.1 wt % or less of the inorganic filler.

Epoxy resin composition and semiconductor apparatus prepared using the same

An epoxy resin composition for encapsulating a semiconductor device includes a curing agent, a curing accelerator, inorganic fillers, and an epoxy resin, the epoxy resin including a first resin represented by Formula 1: wherein R1 and R2 are each independently hydrogen or a C1 to C4 linear or branched alkyl group, and n is a value from 1 to 9 on average.

Growing community of inventors

Uiwang-si, South Korea

Seung Ho Han