Amotech Co., Ltd.

Jun Hwan Jeong

Chang Hak Choi

Byung Kyu Kim

Sahn Nahm

Hwack Joo Lee

Min Han Kim

Seung Chul Lee

Kyung Whan Woo

Moon Soo So

Jung In Yang

Gu Whan Jung

Hyun Choi

Disclosed herein are a disc varistor having a capability to absorb a double amount of surge and a method of manufacturing the varistor. The varistor includes a disc-shaped first ceramic body having first and second electrodes on opposite surfaces thereof, and a disc-shaped second ceramic body having third and fourth electrodes on opposite surfaces thereof. A first lead wire is in interposed between the second and third electrodes and electrically connected to the second and third electrodes. The varistor also includes a second lead wire. The second lead wire has a body portion electrically connected to the first electrode of the first ceramic body, a first extension extending from the body portion to the second ceramic body, and a second extension extending from the first extension to the fourth electrode.

Disc varistor and method of manufacturing the same

The present invention discloses a dielectric ceramic composition having a formula represented by (1&minus;x)Nd(Ga Al )O -xCaTiO , wherein x refers a mole fraction of CaTiO to the composition and satisfies an expression of 0.5&lE;x&lE;0.8, and y refers a mole fraction of Al to Ga and satisfies an expression of 0&lE;y&lE;0.9. The present dielectric substance has a high dielectric constant and a high Q value and a resonant frequency temperature coefficient of near 0. Also, it can be sintered at a low temperature and thus replace the conventional dielectric materials used as a filter for parts of mobile communication or satellite communication appliances.

Dielectric ceramic compositions

A ceramic chip-type device having a glass coating film and a fabricating method thereof are provided, in which a coating film having an excellent acid-resistant property is formed on the surface of the ceramic chip device. Thus, the ceramic chip-type device having a glass coating film stands an attack due to a flux at the time of reflow soldering, to thereby maintain an initial insulation resistance. The ceramic chip-type device is made of a ceramic passive device chip including a pair of external electrode terminals on either end of the ceramic chip-type device, and a glass coating film of an excellent acid-resistant property formed on the surface of a ceramic body located between the pair of external electrode terminals.

Method for fabricating a chip-type varistor having a glass coating layer

The present invention discloses a method for preparing Ba(Zn Ta )O dielectric ceramic compositions. In accordance with the present invention, by adding a small amount of Al O , Ga O , ZrO , or TiO , which can generate metal ion having an atomic value of 3&plus; or 4&plus;, the problems occurring during the sintering of BZT due to the volatilization of Zn can be solved. Also, the BZT dielectrics obtained from the present method have a Q value of 200,000, which is higher than the pure BZT, a dielectric constant of 28.5 or more and a resonant frequency temperature coefficient of near 0.

Method for preparing dielectric ceramic compositions

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Inchon, South Korea

Jun Hwan Jeong