JPH0595003U - Anti-surge resistance parts - Google Patents

Abstract

(57) [Summary] [Purpose] The present invention uses a silver-based resistor film having a sheet resistance value of 0.1 to 3 Ω, and has an AC withstand voltage of 800 V or more and a resistance value of 1 or more.
(EN) Provided is a resistance component for surge resistance, which has an appropriate characteristic of 00 Ω or less and which does not generate a spark in each part of a resistor film and a terminal electrode. [Structure] A meandering resistor film 3 is formed on the surface of an insulating substrate 1.
Terminal electrodes 2a whose both ends are formed on the end of the insulating substrate 1,
2b, the resistance film for surge resistance is formed by being attached so as to be connected to 2b, and the resistance film 3 has a sheet resistance value of 0.1 to 3Ω and a resistance film length of 50 mm or more. is there.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a surge-resistant resistor component which is frequently used in communication equipment and in particular, which detects a surge pulse of up to several thousand volts due to electromagnetic dielectric such as lightning strike on a telephone line or line accident.

[0002]

[Prior art and its problems]

 The surge-proof resistance component has a structure in which a terminal electrode is formed at an end of an insulating substrate made of ceramic or the like, and a resistor film is further formed between the terminal electrodes.

Generally, as a requirement for surge resistant components, a resistor film can achieve a lightning surge resistance voltage of 1000 V or more, an AC withstand voltage of 800 V or more, and a resistance value of 100 Ω or less, and further downsize the entire substrate. is there.

As shown in FIG. 6, a conventional surge resistance component, which has a ruthenium oxide-based resistance film formed on the resistance film of a resistance component for surge protection, has an end formed on an end portion of an insulating substrate 61, as shown in FIG. The width of the resistor film 63 between the child electrodes 62a and 62b was very large.

The ruthenium oxide-based resistor film 63 is formed by baking a resistance paste, which is a mixture of ruthenium oxide powder and a glass component, on an insulating substrate. Since the component contains the resistance film 63, the sheet resistance increases, and since the glass component is relatively weak in surge resistance, such a resistance film satisfies sufficient surge characteristics and has a high resistance value. In order to reduce the value to 100Ω or less, the width of the resistor film had to be made sufficiently large.

Therefore, the area occupied by the resistor film is increased, the shape of the surge-resistant resistor component is increased, and the above-mentioned demand for miniaturization cannot be sufficiently met.

Further, in order to adjust the resistance value, trimming is performed in order to make the width of the resistor film 63 a predetermined width. However, in consideration of the spark due to the lightning surge voltage, the resistor film 63 is moved in the length direction. Trimming had to be done over a sufficiently long range, and there were major restrictions on the manufacturing process.

It is conceivable to form the resistor film with an Ag-based resistor, that is, a silver alloy such as silver or silver-palladium, in place of such a ruthenium oxide resistor film, but it is more conductive than ruthenium oxide. Since the ratio is high, the length of the resistor must be sufficiently long, and naturally, the meandering shape must be formed between the terminal electrodes. The above requirements cannot be met without proper adjustment and proper control of the length of the resistor film. Also, considering the conductivity and miniaturization of the Ag-based resistor material, the width of the resistor film becomes narrower, so sparks may occur at the curved portion of the meandering shape, or the joining of the terminal electrode and the resistor film. Sparks may occur in some parts.

According to the present invention, the sheet resistance value and length of the silver-based resistor film are appropriately controlled to obtain characteristics such as a lightning surge voltage of 1000 V or more, an AC withstand voltage of 800 V or more, and a resistance value of 100 Ω or less. To provide a resistance component for surge resistance.

Another object of the present invention is to provide a surge-resistant resistance component in which sparks do not occur in each part of the resistor film and the terminal electrode.

[0011]

[Means for solving problems]

 According to a first aspect of the present invention, in a resistance component for surge protection, a meandering resistor film is attached to the surface of an insulating substrate so that both ends of the resistor film are connected to terminal electrodes formed at the ends of the insulating substrate. The resistor film has a sheet resistance value of 0.1 to 3Ω, and the resistor film has a length of 50 mm or more.

According to a second aspect of the present invention, a meandering resistor film having a linear portion and a curved portion on the surface of an insulating substrate is connected so that both ends thereof are connected to terminal electrodes formed at the end portions of the insulating substrate. In the resistance component for surge protection formed by wearing, the resistance film has a curved portion whose width is wider than that of a straight portion.

A third invention is a surge resistance resistor formed by applying a meandering resistor film on a surface of an insulating substrate so that both ends thereof are connected to terminal electrodes formed at the ends of the insulating substrate. In the component, the connection between the terminal electrode and the resistor film is made by stacking the corners of the respective right-angled or acute-angled ends so that they do not project from each other. It is a resistance component.

[0014]

[Action]

 In the first invention, since the sheet resistance value of the resistor film is 0.1 to 3Ω and the resistor film has a length of 50 mm or more, the resistor film can be formed on the resistor film by the silver material. Therefore, the width of the resistor film can be narrowed, and miniaturization of the entire resistor component can be easily achieved by the shape of the wiring pattern. Further, trimming of the resistor film becomes easy.

In the second invention, the resistor film is meandering, that is, it is composed of a plurality of straight line portions and a plurality of curved line portions. However, since the width of the curved line portion of the resistor film is made larger than the width of the straight line portion. , The current does not concentrate, and the spark on the curved part can be prevented.

In the third invention, since the corner portion of the terminal electrode or the resistor film exposed from the overlapping portion due to the connection between the terminal electrode and the resistor film is formed to be an obtuse angle or a curved portion, the terminal electrode is connected to the resistor film. The current flowing in the area does not concentrate at the corners, and sparks at the area can be prevented.

[0017]

【Example】

 Hereinafter, the surge-proof resistance component of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view of the present invention, and FIGS. 2 and 3 are partial plan views.

In the figure, 1 is a ceramic substrate, 2a and 2b are terminal electrodes, 3 is a resistor film, and 4 is a protective film. The protective film 4 is shown by a chain line in FIG.

The ceramic substrate 1 is made of alumina ceramic or the like and has a rectangular shape.

The terminal electrodes 2 a and 2 b are made of a silver-based conductor material such as silver or silver-palladium, or a copper-based conductor material such as copper, and are formed at the end portions of the ceramic substrate 1, respectively.

The resistor film 3 is made of a silver-based resistive conductor material such as silver-palladium, and is formed so that both ends thereof are connected to the terminal electrodes 2a and 2b. Since the resistor film 3 has a length sufficiently longer than the length of the substrate 1 in the longitudinal direction, the resistor film 3 is formed in a meandering state. That is, the resistor film 3 is basically composed of a combination of the linear portion 3a and the curved portion 3b. 3c is a ladder-shaped stub that is cut by trimming to adjust the resistance value of the resistor film 3.

The protective film 4 is made of glass such as silica and is formed so as to cover the resistor film 3 so as to expose the terminal electrodes 2a and 2b.

Such a surge resistant component is manufactured by the following steps.

First, a rectangular ceramic substrate 1 having 96% alumina is prepared.

Next, the meandering resistor film 3 is formed on the ceramic substrate 1 at a position where it is connected to the terminal electrodes 2a and 2b. Specifically, a silver-based resistance paste (for example, # 9101 manufactured by Tanaka Massey Co., Ltd.) is used to print on a substrate 1 in a predetermined shape, and then baked at 850 ° C. to be formed.

Next, terminal electrodes 2 a and 2 b connected to both ends of the resistor film 3 are formed on the end portions of the ceramic substrate 1. Specifically, a silver-based (Ag-pd) conductor paste (for example, # 4846 manufactured by Tanaka Massey Co., Ltd.) is used to print in a predetermined shape on the end portion of the substrate 1 and then baked at 850 ° C.

Next, the resistance value of the resistor film 3 is adjusted. Specifically, among the ladder-shaped stubs 3c formed on the resistor film 3, an arbitrary stub 3c is trimmed with a laser. As a result, the actual length of the resistor film 3 changes, and a predetermined resistance value can be set.

Next, the protective film 4 is formed on the resistor film 3. Specifically, an insulating paste containing silica glass (for example, # 5238 manufactured by Asahi Glass Co., Ltd.) as a main component is printed so as to expose the terminal electrodes 2a and 2b, and baked at 600 ° C. This improves withstand voltage and moisture resistance.

Finally, although not shown in the drawings, the lead electrodes are soldered to the terminal electrodes 2a and 2b to complete the surge resistance component.

In the above steps, the step of forming the resistor film 3 and the step of forming the terminal electrodes 2a and 2b may be replaced with each other.

In the present invention, it is important that the resistance film 3 has a sheet resistance value of 0.1 to 3 Ω / □ and a length of the resistance film of 50 mm or more.

The resistor film 3 is formed of a silver-based resistor having a sheet resistance value of 0.1 to 3 Ω / □, so that the resistor film 3 has a conventional ruthenium oxide resistor structure. The pattern length is long and the pattern width is very narrow to form the resistor film in order to obtain a predetermined resistance value as compared with the case where the resistor film is formed by. As a result of various experiments conducted by the present inventors, it was found that the AC withstand voltage is substantially proportional to the area of the resistor film 3 regardless of the sheet resistance value. In the idea, it is actually approximately proportional to the pattern length of the resistor film. That is, in order to achieve the AC breakdown voltage of 800 V or more, the length of the resistor film 3 must be 50 mm or more.

The pattern length of the resistor film 3 of 50 mm or more can be achieved by forming the resistor film 3 into a meandering shape as described above. This is a conventional ruthenium oxide resistor, which can be reduced by about 30% compared to the area occupied for forming the resistor film 3, and is a miniaturized surge resistance component as a whole. .

Further, since the pattern width of the resistor film 3 is narrow, the resistance value can be adjusted by the stub 3c for adjusting the resistance value, so that the trimming is quick and easy.

If the sheet resistance value is in the range of 0.1 to 3 Ω / □, the resistance film width can be narrowed in the meandering pattern of the resistance film 3, so that the linear portion of the adjacent resistance film 3 can be made narrower. Since the interval of 3a can be widened to, for example, 500 μm or more, and the substrate 1 can be downsized, the spark between the resistor films 3 due to the lightning surge voltage does not occur, and the lightning surge voltage characteristic can be secured.

As described above, the resistor film 3 is required to have a lightning surge voltage of 1000 V or more, an AC withstand voltage of 800 V or more, and a resistance value of 100 Ω or less, but the sheet resistance value is less than 0.1 Ω / □. In the resistance film 3, the pattern of the resistance film 3 must be lengthened in order to reduce the resistance value of the antibody film 3 to 100 Ω or less, and thus the resistance film 3 is formed. Occupies an increased area, which imposes restrictions on miniaturized surge-resistant resistance components. In order to reduce the size of the substrate 1, it is necessary to narrow the interval between the adjacent linear portions 3a of the resistor film 3, but if the distance is set to, for example, 500 μm or less, a spark occurs between them and the lightning The surge voltage characteristics will not be satisfied.

Further, in the resistor film 3 having a sheet resistance value exceeding 3Ω / □, the pattern of the resistor film 3 is shortened in order to set the resistance value of the antibody film 3 to 100Ω or less. As a result, the area of the resistor film 3 is reduced, and the AC breakdown voltage of 800 V or more cannot be secured. For example, in a resistor film having a sheet resistance of 10Ω / □, the pattern length of the resistor film must be 30 mm or less in order to reduce the resistance value to 100Ω or less. On the other hand, in the case of a resistor film having a sheet resistance of 3 Ω / □, the length of the resistor film must be 60 mm or less, but when the length of the resistor film is 60 mm, the AC breakdown voltage is 950 V.

After all, in order to secure the resistance value of the resistor film 3 to 100 Ω or less and the AC withstand voltage of 800 V or more, even if the length of the resistor film is 50 mm or more, the sheet resistance value becomes 100 Ω. The material must be set, specifically, the resistance film 3 having a sheet resistance value of 3Ω / □ or less must be formed.

On the contrary, if the length of the resistor film 3 becomes longer than necessary, the lightning surge cannot reach 1000 V or more due to the size increase of the substrate 1 and the generation of sparks between the antibody films 3.

Another characteristic of the present invention is that the curved portion 3b of the meandering resistor film 3 is formed wider than the straight portion 3a. When the resistor film 3 has such a shape, particularly the lightning surge characteristic is greatly improved. That is, if formed in this way, a high-voltage surge current will not concentrate at the curved portion 3b, and no spark will occur at that portion. The inventors of the present invention formed a resistor film 3 having a sheet resistance of 1 Ω / □ in a meandering shape having a pattern length of 75 mm and a pattern width of 0.4 mm (the width of the curved portion 3b was 0.4 mm). A lightning surge voltage of 1000 to 1800 V was applied to the connected terminal electrodes 2a and 2b. The surge voltage waveform was set to have a rise of 10 μs and a rise of 100 μs.

As a result, sparks were generated in the curved portion 3b with a surge voltage of 1500V.

On the other hand, when the width l ₂ of the curved portion 3b of the resistor film 3 is 0.8 mm at the maximum and the width l ₁ of the straight line portion 3a is 0.4 mm, the resistor film 3 is formed. Even with the 1800V lightning surge voltage, the resistor film 3 was not broken.

As a result, even if the width of the resistor film 3 is constant, the current required withstand voltage of 1000 V can be obtained, but in the future, even if the withstand voltage becomes higher, for example, 1500 V or more, sparks will occur. the resistor film 3 which does not, the width l ₁ of the straight portion 3a, l ₂ / l ₁ relationship of the width l ₂ of the curved portion 3b is useful to 1.5 or more.

Another characteristic of the present invention is that the corners of the terminal electrodes 2a, 2b or the resistor film 3 exposed from the overlapping portions of the terminal electrodes 2a, 2b and the end portions of the resistor film 3 are different. It means that it is formed at an obtuse angle or a curved portion.

That is, in FIG. 3, the corners a, b, c, d, e and f at the ends of the terminal electrodes 2a and 2b are obtuse angles, and the corner g at the tips of the terminal electrodes 2a and 2b is Although it is a right angle or an acute angle, this corner portion g exists in the overlapping portion (shown by the shaded area) with the resistor film 3. Further, the corners h and i at the end of the resistor film 3 are at right angles, but the corners h and i are present in the overlapping portion with the terminal electrodes 2a and 2b.

When formed in this manner, the high voltage lightning surge current does not concentrate at the corners of the terminal electrodes 2a and 2b and the resistor film 3, so that sparks do not occur and the lightning surge resistance characteristic is high. Will be improved.

Further, with such a shape, even if the print displacement of the terminal electrodes 2a, 2b or the resistor film 3 occurs, for example, the corner portion h of the resistor film 3 is changed to the terminal electrodes 2a 2, 2b. The printing accuracy can be tolerated as long as it is located inside the end portion connecting eg, ec, ec, and c-a, and at the same time, the corner g at the tip of the terminal electrodes 2a and 2b is not exposed. Is alleviated and the production efficiency of printing is improved.

FIG. 4 shows another embodiment in the overlapping portion of the terminal electrodes 2a and 2b and the resistor film 3. The junction ends of the illustrated terminal electrodes 2a and 2b are configured to have obtuse angle corners j and k and curved portions m to l. Further, the end portion shape of the resistor body film 3 is configured to have curved portions p to u. Also in this embodiment, since the terminal electrodes 2a and 2b and the resistor film 3 do not have any right-angled or acute-angled corners, sparks due to the concentration of the high-voltage lightning surge current are not generated. The lightning surge resistance will be improved.

In FIG. 5, the resistor film 3 has the same shape, and the corners v and w of the joint ends of the terminal electrodes 2a and 2b are right angles. The corners v and w are present in the overlapping portion with the resistor film 3. Further, the curved portions t and u of the resistor film 3 are other than the overlapping portions, but since they are the curved portions t and u, the high voltage lightning surge current is concentrated on the curved portions t and u of the resistor film 3. Since no sparks occur, the lightning surge resistance is improved.

As described above, according to the present invention, the terminal electrode is formed on the end portion of the insulating substrate, and the meandering resistor film is formed between the terminal electrodes. In consideration of the resistance value and the AC withstand voltage, the resistance value and the AC withstand voltage of the resistor film 3 as well as the resistance value and the AC withstand voltage are formed by forming a silver-based conductor material having a sheet resistance value of 0.1 to 3Ω. Even if the formation occupying area is narrowed, it is possible to prevent sparks between the adjacent linear portions of the resistor film 3, and a miniaturized surge resistance component is achieved. Further, since the line width of the resistor film 3 becomes thin, it becomes possible to easily form the stub 3c for adjusting the resistance value, and further, by cutting the stub 3c by laser trimming, the resistance value can be adjusted quickly and easily. You can do it.

Further, since the width of the curved portion of the meandering resistor film is formed wider than the width of the straight portion, the withstand voltage characteristic is remarkably improved, and the withstand voltage surge resistance having high withstand voltage reliability is high. It becomes a part.

Furthermore, the corner portions of the terminal electrodes 2a, 2b or the resistor film 3 exposed from the overlapping portions of the terminal electrodes 2a, 2b and the end portions of the resistor film 3 are formed in obtuse angles or curved portions. As a result, the occurrence of sparks at the joints between the terminal electrodes 2a and 2b and the resistor film 3 is eliminated, and the surge-resistant resistance component has high withstand voltage reliability.

[0053]

[Effect of the device]

 As described above, according to the present invention, by using a silver-based resistor film having a sheet resistance value of 0.1 to 3Ω, suitable characteristics of AC withstand voltage of 800V or more and resistance value of 100Ω or less can be obtained. A miniaturized surge resistance component can be achieved.

Further, it becomes a resistance component for surge resistance in which spark does not occur in each part of the resistor film and the terminal electrode.

[Brief description of drawings]

FIG. 1 is a plan view of a surge-resistant resistance component of the present invention.

FIG. 2 is an enlarged view of a curved portion of a resistor film of a surge resistance component according to the present invention.

FIG. 3 is an enlarged view of a joint portion between a resistor film and a terminal electrode of the surge-proof resistance component of the present invention.

FIG. 4 is an enlarged view of a joint portion between another resistor film of the present invention and a terminal electrode.

FIG. 5 is an enlarged view of a joint portion between another resistor film of the present invention and a terminal electrode.

FIG. 6 is a plan view of a conventional surge-proof resistance component.

[Explanation of symbols]

 1 ... Ceramic substrate 2a, 2b ... Terminal electrode 3 ... Resistor film 4 ... Protective film

Front Page Continuation (72) Koichi Oba 1-1, Yamashita-cho, Kokubun-shi, Kagoshima Kyocera Kokubun Plant

Claims (3)

[Scope of utility model registration request] 1. A meandering resistor film is formed on the surface of an insulating substrate.
In a surge-resistant resistance component formed by attaching both ends thereof to terminal electrodes formed at the end of an insulating substrate, the resistance film has a sheet resistance value of 0.1 to 3Ω, A resistance component for surge resistance, wherein the resistance film has a length of 50 mm or more. 2. A meandering resistor film having a linear portion and a curved portion is attached to the surface of an insulating substrate so that both ends thereof are connected to terminal electrodes formed at the end portions of the insulating substrate. The resistance component for surge resistance is characterized in that the width of the curved portion of the resistor film is wider than the width of the straight portion. 3. A meandering resistor film on the surface of the insulating substrate,
In a surge-resistant resistance component formed so that both ends thereof are connected to terminal electrodes formed at the ends of an insulating substrate, the terminal electrodes and the resistor film are connected at right angles or acute angles. Resistance component for surge protection, which is performed by overlapping the corner portions of the end portions so as not to project from each other.