Claims
- 1. A method of producing a metal film resistor having a fuse function, comprising the steps of:
- imparting conductivity to a surface of an electrically insulating substrate by:
- sequentially performing an etching treatment,
- performing an activating treatment,
- performing an electroless plating treatment to the electrically insulating substrate,
- forming a film of a nickel-phosphorous alloy on the electrically insulating substrate by an electrolytic plating treatment, which is conducted so that said film has a thickness in edge parts which is greater than that of other thinner parts of the film to provide a fusing function in the other thinner parts, and
- performing a heat ageing treatment on the film of a nickel-phosphorous alloy and the electrically insulating substrate.
- 2. A method in accordance with claim 1 wherein said insulating substrate is a ceramic substrate.
- 3. A method of producing a metal film resistor having a fuse function, consisting of the steps of:
- imparting conductivity to a surface of an electrically insulating substrate by:
- sequentially performing an etching treatment,
- performing an activating treatment,
- performing an electroless plating treatment to the electrically insulating substrate, and
- forming a film of a nickel-phosphorous alloy on the electrically insulating substrate by an electrolytic plating treatment, which is conducted so that said film has a thickness in edge parts which is greater than that of other thinner parts of the film to provide a fusing function in the other thinner parts.
- 4. The method in accordance with claim 3 further consisting of the step of performing a heat ageing treatment on the film of a nickel-phosphorous alloy and the electrically insulating substrate.
- 5. A method in accordance with claim 4 wherein said insulating substrate is a ceramic substrate.
- 6. A method in accordance with claim 3 wherein said insulating substrate is a ceramic substrate.
Priority Claims (1)
Number |
Date |
Country |
Kind |
5-113320 |
May 1993 |
JPX |
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Parent Case Info
This application is a continuation of PCT/JP94/00739 filed Feb. 5, 1994 and of U.S. patent application Ser. No. 08/811,174 filed Mar. 4, 1997, now U.S. Pat. No. 5,863,407 issued on Jan. 26, 1999 which is a divisional of application Ser. No. 08/360,814 filed Dec. 29, 1994, now abandoned.
US Referenced Citations (15)
Foreign Referenced Citations (1)
Number |
Date |
Country |
57-20687 |
Apr 1982 |
JPX |
Related Publications (1)
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Number |
Date |
Country |
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811,174 |
Mar 1997 |
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Divisions (1)
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Number |
Date |
Country |
Parent |
360,814 |
Dec 1994 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
PCT/JP94/00739 |
Feb 1994 |
|