JPS62105403A - Resistor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Field for Tosaku Jop Sword The present invention relates to resistors such as chip resistors.

Silver is often used in the conductor electrodes of this type of resistor, but at the boundary between the electrode and the resistance layer, a phenomenon called electromigration, where silver diffuses into the resistance layer, occurs. If this occurs, it will cause a change in resistance value or poor connection, but this diffusion phenomenon can be suppressed by containing palladium. materials are being used more and more.

However, if the entire electrode contains palladium, the palladium raw material is relatively expensive, so there are problems such as increasing the cost of the resistor. It was causing a point.

In view of these problems, it is an object of the present invention to provide a resistor in which the palladium content can be reduced without deteriorating the resistor performance and the price can be reduced.

In order to achieve the above-mentioned object, this invention includes a conductor having a resistor connection region whose main component is silver and which contains palladium, and a resistor connection region whose main component is silver. It is characterized by comprising an external connection area that does not contain palladium.

The plate resistor connection region connects directly to the resistor to prevent electromigration from occurring at the interface with the resistor. Since the entire conductor contains palladium and does not include an external connection area, the amount of palladium used is less than when it is composed of an electrode of palladium silver thread + a region of A material.

1 - Example 1 Figure 1 Schematic diagram of a chip resistor which is an embodiment of the present invention 1
1f) Cross-sectional view).

In the figure, the book moon 10 is a rectangular substrate made of an insulating bamboo material such as alumina, and a uniform conductor and internal electrodes 40 of the wire 2-(i) are formed on opposite edges of the surface. :l, It is composed of a resistor connection area 41 made of a thick electrode material of palladium silver thread, and an external connection area 42 made of a thick silver thread. Between the resistor connection area 41 and the external connection area 42, A resistor 20 is formed of a thick rucinium oxide material so as to straddle the resistor 20.An external electrode 43 for half 1.'fl (-, J' iJ) to the wiring board is formed on the end surface of the substrate 10. The resistor 20 is covered with a protective film 30 made of black glass lid.

One process for manufacturing a chip resistor having the above structure will be explained with reference to FIG.

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■ Next, resistor 201 Otsuko 111 colors! Cover the protective film 3B with No'-ts 1-, and then apply the protective film 3B with Slip 1 and 2.
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it 1ml l:: After forming the external electrode 43, attach it to each chip component! １１＜U）;'I'l.

Note that the present invention is applicable to TI (external electrode 43G for board mounting) (
It can also be applied to things that cannot be used, such as resistors.

According to the present invention, the palladium-containing resistor connection region is directly connected to the resistor, preventing electromigration from occurring at the boundary with the resistor, thereby reducing performance. It is possible to reduce the price by 4+ζ by reducing the amount of palladium used without causing any damage.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of a chip resistor according to an embodiment of the present invention, and FIG. DESCRIPTION OF SYMBOLS 10... Substrate, 20... Resistor, 41... Resistor connection area, 42... External connection area. Patent Applicant: ROHM Co., Ltd. Agent, Patent Attorney: Takaharu Ohnishi (,-)

Claims (1)

[Claims] (1) In a resistor in which a resistor is formed across a pair of conductors on a substrate, the conductor is connected to a resistor connection area whose main component is silver and contains palladium, and an external connection whose main component is silver and does not contain palladium. A resistor consisting of a region.