[특허]Refractory metal paste for solid electrolytic capacitors

Refractory metal paste for solid electrolytic capacitors 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H01G-009/145 H01G-004/228
출원번호	US-0474311 (2009-05-29)
등록번호	US-8199461 (2012-06-12)
발명자 / 주소	Zednicek, Stanislav Millman, William A.
출원인 / 주소	AVX Corporation
대리인 / 주소	Dority & Manning, P.A.
인용정보	피인용 횟수 : 0 인용 특허 : 44

초록 ▼

A solid electrolytic capacitor that contains a capacitor element that includes an anode body, dielectric layer, and solid electrolyte is provided. The capacitor also contains an anode lead that is electrically connected to the anode body. Contrary to conventional capacitors in which the lead is welded or connected using a layer of seed particles, a refractory metal paste (e.g., tantalum paste) is employed in the present invention to electrically connect the anode lead to the anode body. The use of such a refractory metal paste allows the anode lead to be sinter bonded to a surface of the anode body after it is pressed. In this manner, a strong and reliable connection may be achieved without substantially decreasing the surface area of the lead that is available for connection to a termination. The paste of the present invention generally contains particles of a relatively small size. Due to in part to the relatively small size of the particles, the paste may have a relatively low viscosity, allowing it to be readily handled and applied to an anode lead and/or anode body during manufacture of the capacitor. Further, the thickness of the applied paste may also be relatively thin and still achieve the desired binding of the lead to the anode body.

대표청구항 ▼

1. A solid electrolytic capacitor comprising: a capacitor element that includes an anode body, a dielectric layer overlying at least a portion of the anode body, and a cathode overlying at least a portion of the dielectric layer, the cathode including a solid electrolyte, and wherein the anode body is a pressed porous pellet;an anode lead that is electrically connected to a surface of the anode body by a refractory metal paste that contains a plurality of particles having an average size of from about 0.1 to about 20 micrometers, wherein the paste has a thickness of from about 0.01 to about 50 micrometers, wherein the particles are sinter bonded to both the anode lead and the anode body;an anode termination that is electrically connected to the anode lead;a cathode termination that is electrically connected to the cathode; anda case that encloses the entire capacitor element so that the capacitor has an upper surface and opposing lower surface, wherein at least a portion of the anode termination and at least a portion the cathode termination remain exposed by the case at the lower surface of the capacitor. 2. The solid electrolytic capacitor of claim 1, wherein the anode body includes tantalum, niobium, or an electrically conductive oxide thereof. 3. The solid electrolytic capacitor of claim 1, wherein the anode lead contains tantalum or niobium. 4. The solid electrolytic capacitor of claim 1, wherein the particles are formed from tantalum. 5. The solid electrolytic capacitor of claim 1, wherein the particles have an average size of from about 1 to about 10 micrometers. 6. The solid electrolytic capacitor of claim 1, wherein the solid electrolyte includes manganese dioxide or a conductive polymer. 7. The solid electrolytic capacitor of claim 1, wherein the anode lead is a wire. 8. The solid electrolytic capacitor of claim 1, wherein the anode lead is a sheet or ribbon. 9. The solid electrolytic capacitor of claim 1, wherein the anode termination and cathode termination both extend primarily in a direction that is parallel to a first surface of the capacitor element, the anode and cathode terminations being electrically connected to the first surface of the capacitor element. 10. The solid electrolytic capacitor of claim 1, wherein the exposed portions of the anode termination and the cathode termination are generally coplanar. 11. The solid electrolytic capacitor of claim 1, wherein the paste has a thickness of from about 1 to about 25 micrometers. 12. The solid electrolytic capacitor of claim 1, wherein a single refractory metal paste is used to electrically connect the anode lead to a surface of the anode body.

이 특허에 인용된 특허 (44)

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Fife, James A., Methods to make capacitors containing a partially reduced niobium metal oxide.
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James A. Fife, Methods to partially reduce a niobium metal oxide and oxygen reduced niobium oxides.
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James A. Fife, Methods to partially reduce a niobium metal oxide oxygen reduced niobium oxides.
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Kimmel, Jonathon L.; Kitchell, Ricky W., Oxygen reduced niobium oxides.
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Krismer Bruno E.,DEX ; Thies Uwe,DEX ; Ladstatter Peter,DEX ; Hunert Rudolf,DEX, Pastes for the coating of substrates, methods for manufacturing them and their use.
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Sturmer John (N. Berwick ME) Cadwallader John Y. (Saco ME), Tantalum capacitor and method of making same.
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A	생활필수품
A62	인명구조; 소방(사다리 E06C)
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A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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