Murata Manufacturing Co., Ltd.

Takayuki Tsukizawa

Jun Adachi

Takahiro Sumi

Tetsuya Ikeda

Kumiko Ishikawa

Kumiko Hiehata

Jun Urakawa

Takeshi Miki

Akiyoshi Kawamura

Katsumi Yasunaka

Mayu Suzuki

Takayuki Imada

Yoshihito Otsubo

Takashi Noma

Yasutaka Sugimoto

Osamu Chikagawa

Masanori Okamoto

Yutaka Fukuda

Sumiyo Nakamura

Hiromitsu Hongo

Nobuyuki Sakai

Takahiro Kitadume

Yuzo Kawada

Katumi Yasunaka

An ESD protection device includes an insulating substrate, first and second discharge electrodes in contact with the insulating substrate, the first and second discharge electrodes separated from each other and opposing each other, first and second outer electrodes on an outside surface of the insulating substrate, the first outer electrode being electrically connected to the first discharge electrode and the second outer electrode being electrically connected to the second discharge electrode, and a discharge auxiliary electrode spanning the first discharge electrode and the second discharge electrode in a region where the discharge electrodes oppose each other. The discharge auxiliary electrode includes semiconductor particles and metal particles. An average particle diameter of the metal particles is about 0.3 &#x3bc;m to about 1.5 &#x3bc;m. A density of the metal particles is greater than or equal to about 20 particles/50 &#x3bc;mand the semiconductor particles include an oxygen-containing layer on surfaces of the semiconductor particles.

Electrostatic discharge protection device and method of manufacturing the same

An ESD protection device includes first and second discharge electrodes and a discharge auxiliary electrode that is electrically connected to the first and second discharge electrodes. The first and second discharge electrodes are located on or in an insulating substrate to at least partially face each other. The discharge auxiliary electrode includes first metal particles, second metal particles, and a binding agent. The first metal particles have a core-shell structure including a core section mainly including a first metal and a shell section which mainly includes an oxide of a second metal and which includes at least one portion with a cavity. The second metal particles have a core-shell structure including a core section mainly including the first metal and a shell section which mainly includes the oxide of the second metal and which has no cavity.

ESD protection device and method for manufacturing the same

An electro-static discharge protection device includes a ceramic base material, first and second outer electrodes on the outer surface of the ceramic base material, a hollow portion inside the ceramic base material, a first discharge electrode including a first end portion electrically connected to the first outer electrode and a second end portion in the hollow portion, a second discharge electrode including a first end portion electrically connected to the second outer electrode and a second end portion spaced apart from the first discharge electrode in the hollow portion, and a discharge supporting electrode including silicon carbide and between the second end portion of the first discharge electrode and the second end portion of the second discharge electrode. The elemental alkali metal in the ceramic base material is about 3 percent by weight or less.

Electro-static discharge protection device

An ESD protection device includes a base body, first and second discharge electrodes provided in the base body and facing each other in a lamination direction, and a discharge auxiliary electrode that is provided between the first and second discharge electrodes and electrically couples the first and second discharge electrodes. The base body includes a cavity provided around at least a portion of an outer surface of the discharge auxiliary electrode and the cavity exposes the first discharge electrode, the second discharge electrode, and a region that is included in the outer surface of the discharge auxiliary electrode and is present between the first discharge electrode and the second discharge electrode.

ESD protection device

A multilayer wiring board includes: a multilayer body including a plurality of insulating layers; a lower outer electrode provided on a lower surface of the multilayer body; a first via conductor connected at one end to the lower outer electrode; a first in-plane conductor connected to another end of the first via conductor; a second via conductor provided within the multilayer body on a surface of the first in-plane conductor on the opposite side from a surface of the first in-plane conductor in a position distanced from the first via conductor viewed in a direction orthogonal to a layering direction of the multilayer body, one end of the second via conductor being connected to the first in-plane conductor; and a second in-plane conductor connected to another end of the second via conductor. A line width of the first in-plane conductor is narrower than that of the second in-plane conductor.

Multilayer wiring board and probe card having the same

There is provided an ESD protection device capable of lowering a discharge starting voltage. An ESD protection deviceincludes a ceramic multilayer substrate, a first discharge electrodeand a second discharge electrodearranged at a height position of the ceramic multilayer substrate, an endof the first discharge electrodeand an endof the second discharge electrodefacing each other, in which each of the first discharge electrodeand the second discharge electrodecontains a metal and a shrinkage suppression material having a lower rate of shrinkage than that of the metal at a temperature at which firing for the production of the ceramic multilayer substrateis performed.

An ESD protective device is provided which can lower a discharge start voltage. In an ESD protective device, first and second discharge electrodesandare disposed in a substratein a spaced relation with a discharge gap G interposed therebetween, and a conductoris arranged around the discharge gap G. The conductorhas a nonlinear sectional shape in a section of the substrateextending in a direction interconnecting a first principal surfaceand a second principal surfaceof the substrateand passing the discharge gap G.

ESD protective device

An ESD protection devicehas a ceramic insulating materialfirst and second discharge electrodesandand a discharge-assisting sectionThe first and second discharge electrodesandare disposed somewhere of the ceramic insulating materialThe discharge-assisting sectionis located between the distal end portion of the first discharge electrodeand the distal end portion of the second discharge electrodeThe discharge-assisting sectionis an electrode configured to reduce the discharge starting voltage between the first discharge electrodeand the second discharge electrodeThe discharge-assisting sectionis made from a sintered body containing conductive particles and at least one of semiconductor particles and insulating particles. The first and second discharge electrodes contain at least one of the semiconductor material constituting the semiconductor particles and the insulating material constituting the insulating particles.

An ESD protection deviceincludes an insulating memberfirst and second discharge electrodesanda first outer electrodea second outer electrodeand inner conductorsandThe first and second discharge electrodesandare provided in the insulating memberThe first outer electrodeis provided on an outer surface of the insulating memberThe first outer electrodeis electrically connected to the first discharge electrodeThe second outer electrodeis provided on an outer surface of the insulating memberThe second outer electrodeis electrically connected to the second discharge electrodeThe inner conductorsandare provided in the insulating memberThe inner conductorsandare connected to the first outer electrodeor the second outer electrode

An ESD protection device having high insulation reliability and excellent discharge characteristics is provided. In an ESD protection device including a first and a second discharge electrode disposed to face each other, a discharge auxiliary electrode () formed so as to bridge the first and second discharge electrodes, and an insulating substrate holding the first and second discharge electrodes and the discharge auxiliary electrode (), the discharge auxiliary electrode () is formed of an aggregate of metal grains () each having a core-shell structure comprising a core portion () primarily formed of a first metal and a shell portion () primarily formed of a metal oxide containing a second metal, and the aggregate of metal grains () further includes an insulating resin () which bonds the metal grains () to each other.

An ESD protection device providing highly reliable insulation and having good discharge characteristics is provided. An ESD protection device has opposing first and second discharge electrodes, an auxiliary discharge electrode () astride between the first and second discharge electrodes, and an insulating substrate () supporting the first and second discharge electrodes and the auxiliary discharge electrode (). The auxiliary discharge electrode () is composed of an assembly of core-shell metal particles () that have a core portion () mainly composed of a first metal and a shell portion () mainly composed of a metal oxide that contains a second metal. The metal particles () are substantially completely covered with the shell portion () mainly composed of the metal oxide, and this improves the insulation reliability of the device against discharge. Preferably, the metal particles () have a bond with each other with a vitreous substance () therebetween.

ESD protection device and method for producing same

Provided is an ESD protection device having excellent discharge characteristics at a low applied voltage. An ESD protection device includes a first discharge electrode and a second discharge electrode that are disposed so as to face each other, a discharge auxiliary electrode formed so as to span between the first discharge electrode and the second discharge electrode, and an insulator base that holds the first discharge electrode, the second discharge electrode, and the discharge auxiliary electrode. The discharge auxiliary electrode includes a plurality of metal particles () containing a first metal as a main component. Fine irregularities are formed on the surfaces of the metal particles (). More specifically, the metal particles () has a fractal dimension D of 1.03 or more. Since electric charges are concentrated on the fine irregularities, discharge can be generated in the discharge auxiliary electrode by applying a relatively low voltage.

ESD protection device and method for producing the same

Provided is an ESD protection device having high insulation reliability and good discharge characteristics. An ESD protection device includes a first discharge electrode and a second discharge electrode that are disposed so as to face each other, a discharge auxiliary electrode () formed so as to span between the first discharge electrode and the second discharge electrode, and an insulator base that holds the first discharge electrode, the second discharge electrode, and the discharge auxiliary electrode (). The discharge auxiliary electrode () includes an aggregate of a plurality of metal particles () each having a core-shell structure including a core portion () that contains, as a main component, a first metal and a shell portion () that contains, as a main component, a metal oxide containing a second metal. A pore () is present in at least part of the shell portion ().

An ESD protection device having high insulation reliability and good discharge properties is provided. In producing an ESD protection device that includes a first discharge electrode and a second discharge electrode arranged to oppose each other, a discharge supporting electrode formed so as to span between the first and second discharge electrodes, and an insulator substrate that retains the first and second discharge electrodes and the discharge supporting electrode, a paste for forming a discharge supporting electrode is used and this paste contains, in addition to a powder of an alkali metal compound and/or an alkaline earth metal compound, a metal powder with a network-forming oxide adhered to particle surfaces, a metal powder and a semiconductor powder with a network-forming oxide adhered to particle surfaces, or a metal powder with a network-forming oxide adhered to particle surfaces and a semiconductor powder with a network-forming oxide adhered to particle surfaces.

An ESD protection device includes a first discharge electrode and a second discharge electrode arranged to oppose each other, a discharge supporting electrode formed so as to span between the first and second discharge electrodes, and an insulator substrate that retains the first and second discharge electrodes and the discharge supporting electrode. The discharge supporting electrode is constituted by a group of a plurality of metal particles each coated with a semiconductor film containing silicon carbide. This discharge supporting electrode is obtained by firing a semiconductor-metal complex powder in which a semiconductor powder composed of silicon carbide is fixed to surfaces of metal particles. Selection is made so that the relationship between a coating amount Q [wt %] of the semiconductor powder in the semiconductor-metal complex powder and a specific surface area S [m/g] of the metal powder satisfies Q/S&#x2267;8.

Growing community of inventors

Kyoto, Japan

Takayuki Tsukizawa