Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Hideaki Tokunaga

Kenji Nozoe

Tatsuya Inoue

Takeshi Iseki

Takashi Morino

Yasuo Wakahata

Kouichi Yoshioka

Eiichi Uriu

Keiichi Noi

Takeshi Orita

Riho Sasaki

Kaori Shiraishi

Naoki Mutoh

Naotsugu Yoneda

Miho Higashitani

An overvoltage protector includes a first discharging electrode, a second discharging electrode, and an overvoltage protection part provided between the first and second discharging electrodes. The overvoltage protecting part has an insulating property under a normal operation condition, and has a conductive property if an overvoltage is applied between the first and second discharging electrodes. The overvoltage protecting part is made of a mixture of resin having an insulation property, an inorganic compound having an insulating property, and metallic boride compound powder. The metallic boride compound powder has a high melting point therefore it is hardly melted. Under high temperatures causing the powder to melt, the powder is oxidized and loses conductivity, thus providing a high reliability.

Overvoltage protection component, and overvoltage protection material for overvoltage protection component

A conductive layer mainly made of gold is formed on an upper surface of an insulating substrate. Plural electrodes facing each other via a gap is formed by forming the gap in the conductive layer. An overvoltage protective layer covering the gap and a portion of each of the plurality of electrodes is formed. This method can provide the gap with a narrow width precisely, and thereby, provide an electrostatic (ESD) protector with a low peak voltage, stable characteristics of suppressing electrostatic discharge, and a high resistance to sulfidation.

Anti-static part and its manufacturing method

The static-electricity control part of the present invention contains multiple pairs of backside electrodes () provided on both end portions () of a long-edge-side at the backside of insulating substrate (); multiple pairs of top electrodes () provided on both end portions () of a long-edge-side at the top face of insulating substrate (); top ground electrode () provided on the top face of insulating substrate () from its short-edge-side one end portion () to other end portion (); overvoltage protection material layer () for filling gap () formed between any one of the multiple pair pairs of top electrodes () and top ground electrode (); and backside wiring () provided on the backside of insulating substrate () so as to connect between the multiple pairs of backside electrodes ().

Static electricity control part and process for manufacturing the same

A static electricity countermeasure component comprising; a ceramic substrate; at least two extractor electrodes opposingly disposed and mutually separated on the ceramic substrate; an over-voltage protective material layer disposed to cover a portion of each extractor electrode and a gap between the extractor electrodes, containing a metal powder and a silicone-based resin; an intermediate layer disposed over the over-voltage protective material layer, containing an insulating powder and a silicone-based resin; and a protective resin layer disposed over the intermediate layer.

Static electricity countermeasure component

A high-frequency device includes an antenna terminal, a signal line connected to the antenna terminal, a high-frequency signal processing circuit connected to the signal line, a capacitance element having one end connected to the signal line and other end grounded, and an inductor having one end connected to the signal line and other end grounded. The high-frequency device can protect the high-frequency signal processing circuit from a high voltage noise, such as a static electricity, having a frequency close to a signal pass band.

High-frequency device

On the surface of a ceramic sinter, at least an external electrode for input, an external electrode for output, and external electrodes for grounding are disposed, and the ceramic sinter includes an inductor electrically connected to the external electrode for input and external electrode for output, and a varistor electrically connected to the external electrode for input and external electrodes for grounding. By connecting the inductor to the signal line of the circuit of an electronic appliance and connecting the varistor between the input side of the signal line and the ground, electrostatic discharge pulses of about 0.5 to 2 nanoseconds can be suppressed efficiently.

Electrostatic discharge protection component

A precipitate film having plating resistance may be formed on the surface of a varistor element during sintering process. Accordingly, the manufacturing process can be shortened, thereby improving the productivity. The manufacturing method comprises (a) a first process of forming the varistor element whose main component is zinc oxide; (b) a second process of sintering the varistor element and precipitating zinc compound having at least one of acid resistance and alkali resistance on the surface of the varistor. Preferably, the manufacturing method further comprises (c) a process of attaching an external electrode to the varistor element, and the external electrode attaching process is executed after finishing the varistor element sintering process.

Zinc oxide varistor and method of manufacturing same

A method for manufacturing varistor by which a varistor having a high plating resistance and a high moisture resistance is manufactured by selectively forming a compact high-resistance layer having a uniform thickness on the surface of a varistor element. In the method, the varistor element (,) is first formed by alternately laminating ceramic sheets (,) mainly of a zinc oxide and internal electrodes (,) upon one another, and then, Ag electrode paste which becomes external electrodes (,) is applied to both end faces of the element (,). Then, after the element (,) is sintered through heat treatment, the element (,) is buried in SiO,or a mixture (,) containing SiO,and the element (,) is heat-treated for 5-10 minutes at 600-950&deg; C. in the air or in an oxygen atmosphere.

Method for manufacturing varistor

The varistor element contains zinc-oxide as a main constituent and at least bismuth and antimony as accessory constituents. The content of bismuth in the form of Bi.sub.2 O.sub.3 is in a range from about 0.1 to 4.0 mol % and the content of antimony in the form of Sb.sub.2 O.sub.3 constitutes a mol-ratio of Sb.sub.2 O.sub.3 /Bi.sub.2 O.sub.3 less than or equal to about 1.0 mol %. These materials are mixed thoroughly and are pressed into a compact. After coating both sides of the compact with Ag or Ag--Pd paste, the compact and its electrodes are sintered simultaneously at a temperature of about 800.degree. C. to 960.degree. C.

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Osaka, Japan

Hideaki Tokunaga