JP2000216001A - Rectangular chip resistor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rectangular chip resistor having excellent surge-resisting property. SOLUTION: This chip resistor is provided with a substrate 11, a pair of upper surface electrodes 12 where a protruding part 12a, provided on both ends of the upper surface of the substrate 11 protruding toward the inside of the substrate 11 creeping along the upper surface of the substrate 11, and a resistor 13 which is positioned between the pair of the upper surface electrodes 12 electrically connected to the pair of upper surface electrodes and provided in such a manner that a gap is formed between the pair of upper surface electrodes 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a square chip resistor excellent in surge resistance and used for various electronic devices.

[0002]

2. Description of the Related Art In recent years, as electronic devices have become lighter, thinner and smaller, chip resistors have been widely used as resistance elements. In addition, replacement with leaded carbon film resistors has been actively pursued along with surface mounting, and the market is demanding the development of chip resistors having excellent surge resistance. Generally, when a surge voltage generated by the influence of static electricity, power supply noise, or the like is applied to a chip resistor, its resistance value tends to change easily.

A conventional square chip resistor is disclosed in Japanese Unexamined Patent Publication No. 9-20.
One described in Japanese Patent No. 5004 is known.

Hereinafter, a conventional square chip resistor will be described with reference to the drawings.

FIG. 7 is a plan view of a conventional square chip resistor (a protective film 4 and side electrodes 5 are not shown), and FIG. 8 is a perspective view in which a part of the plan view of the same square chip resistor is cut away. is there.

In FIGS. 7 and 8, reference numeral 1 denotes an insulating substrate. Reference numeral 2 denotes a pair of upper electrodes, which are provided at both ends of the upper surface of the insulating substrate 1. Reference numeral 3 denotes a resistor, which is located between the pair of upper electrodes 2 and is provided so as to be electrically connected to a part of the pair of upper electrodes 2. A protection film 4 is provided so as to cover a part of the pair of upper electrodes 2 and the resistor 3. Reference numeral 5 denotes a side surface electrode, which is located on an end surface of the insulating substrate 1.

[0007]

In the conventional rectangular chip resistor configured as described above, the distance between the pair of upper electrodes 2 of the resistor 3 and the pair of upper electrodes 2 is reduced. Because of its short length, when a surge voltage is applied to both ends of the rectangular chip resistor, discharge easily occurs between the resistor 3 and the pair of upper electrodes 2.
Since insulation breakdown and deterioration between the parts are likely to occur,
There is a problem that the surge resistance is inferior.

An object of the present invention is to solve the above conventional problems and to provide a square chip resistor having excellent surge resistance.

[0009]

In order to achieve the above object, a rectangular chip resistor according to the present invention is provided on a substrate and at both ends of an upper surface of the substrate, and is provided on the substrate so as to be along the upper surface of the substrate. A pair of upper surface electrodes formed with a convex portion protruding toward the inside, and located between the pair of upper surface electrodes, and electrically connected to the pair of upper surface electrodes at the convex portion; And a resistor provided so that a gap is formed between the upper electrode and the upper electrode. According to this configuration, a square chip resistor having excellent surge resistance can be provided.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a substrate, provided at both ends of an upper surface of the substrate, and protruding inward of the substrate along the upper surface of the substrate. A pair of upper surface electrodes having a convex portion formed thereon, located between the pair of upper surface electrodes, and electrically connected to the pair of upper surface electrodes at the convex portions, and further between the pair of upper surface electrodes. According to this configuration, the gap between the pair of upper surface electrodes and the resistor causes a portion of the resistor that faces the pair of upper electrodes to form a gap. And, since the distance between the pair of upper electrodes can be lengthened, even when a surge voltage is applied to both ends of the rectangular chip resistor, it is possible to suppress discharge generated between the resistor and the pair of upper electrodes. Between the resistor and the pair of upper electrodes It is possible to prevent breakdown of the deterioration, and has an effect that it can provide an excellent rectangular chip resistor surge characteristics.

According to a second aspect of the present invention, the resistor has a meandering shape. According to this configuration, the length of the resistor can be increased, and the contact area between the resistor and the substrate is increased. As a result, the heat generated by the resistor can be efficiently released to the substrate, thereby suppressing the heat generated by the resistor when a surge voltage is applied. As a result, a square chip resistor having excellent surge resistance can be provided. It has the effect of being able to.

According to a third aspect of the present invention, a portion of the resistor opposed to the pair of upper electrodes is located inside the substrate from the tips of the protrusions provided on the pair of upper electrodes.
According to this configuration, since the distance between the pair of upper electrodes in the resistor and the pair of upper electrodes can be further increased, even when a surge voltage is applied to both ends of the rectangular chip resistor, Discharge generated between the resistor and the pair of upper electrodes can be further suppressed, and thereby, breakdown and deterioration of insulation between the resistor and the pair of upper electrodes can be more effectively prevented. This has the function of providing an excellent square chip resistor.

Hereinafter, a rectangular chip resistor according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a top view of a rectangular chip resistor according to an embodiment of the present invention.

In FIG. 1, reference numeral 11 denotes a substrate, alumina,
Made of insulating material such as mullite. Reference numeral 12 denotes a pair of upper electrodes, which are provided at both ends of the upper surface of the substrate 11 and are made of a low-resistance metal such as silver or copper. The pair of upper surface electrodes 12 are provided with protrusions 12 a protruding toward the inside of the substrate 11 along the upper surface of the substrate 11. 1
Reference numeral 3 denotes a resistor which is located between the pair of upper electrodes 12 and is provided so as to be electrically connected to the pair of upper electrodes 12 at the pair of projections 12a. Also, the resistor 13
Has a meandering shape and is made of ruthenium containing glass frit. Further, a gap is formed between the resistor 13 and the pair of upper electrodes 12, and a portion of the resistor 13 facing the pair of upper electrodes 12 is a tip of a convex portion 12 a provided on the pair of upper electrodes 12. It is provided further inside the substrate 11.

The protrusions 12a are formed by the gap between the resistor 13 and the pair of upper electrodes 12 obtained by the protrusions 12a. Can prevent deterioration,
Further, the resistor 13 is formed so as to obtain a contact area between the pair of upper electrodes 12 and the resistor 13 such that the resistor 13 does not peel off from the pair of upper electrodes 12. Reference numeral 14 denotes a protective film (not shown), which is part of the pair of upper electrodes 12 and the resistor 1.
3 is provided. Reference numeral 15 denotes a side surface electrode (not shown), which is located on an end surface of the substrate 11.

FIGS. 2A to 2D are process diagrams showing a method of manufacturing a square chip resistor according to an embodiment of the present invention.

First, as shown in FIG.
On both ends of the upper surface of the substrate 11 so as to be along the upper surface of the substrate 11.
The pair of upper electrodes 12 is provided and baked so that each of the protrusions 12a protruding inward is formed.

Next, as shown in FIG. 2B, a meandering resistor 13 is positioned between the pair of upper electrodes 12 so that both ends are electrically connected to the pair of protrusions 12a. Provide and fire. At this time, a gap is formed between the resistor 13 and the pair of upper electrodes 12, and the portion of the resistor 13 facing the pair of upper electrodes 12 is formed by the pair of upper electrodes 12.
Is provided on the inner side of the substrate 11 from the tip of the convex portion 12a provided on the substrate 11.

Next, as shown in FIG. 2C, the protective film 1 covers a part of the pair of upper electrodes 12 and the resistor 13.
4 and fired.

Finally, as shown in FIG.
One side electrode 15 is provided at one end and fired to manufacture a square chip resistor according to an embodiment of the present invention.

FIG. 3 is a circuit diagram showing a measuring circuit used for measuring the rate of change in resistance after the application of a surge voltage.

The circuit shown in FIG. 3 comprises a power supply 21, a capacitor 22, and a switch 23 connected in series,
4 are connected in parallel. In this circuit,
The switch 23 is set so that a load is applied to the capacitor 22.
Is input to the power supply 21 side, the electric charge is accumulated in the capacitor 22, and then when the switch 23 is switched to the sample 24 side, this electric charge is applied to the sample 24 as a surge voltage. Here, the capacitor 22 uses a capacitor of about 150 pF, and the voltage of the power supply 21 is 5 kV from 5 kV to 25 kV.
The voltage is increased sequentially at intervals. At the time of applying each voltage, the switch 23 is switched ten times in a period of 5 seconds (1 second on the sample side and 4 seconds on the power supply side).

FIG. 4 illustrates the use of the measurement circuit shown in FIG.
FIG. 7 is a diagram showing the results of measuring the resistance value change rate after application of a surge voltage for a conventional square chip resistor and the square chip resistor according to one embodiment of the present invention.

As is apparent from FIG. 4, the rectangular chip resistor in one embodiment of the present invention has a smaller rate of change in resistance value after application of a surge voltage than the conventional square chip resistor. That is, in the rectangular chip resistor according to the embodiment of the present invention, the breakdown and deterioration of the insulation between the resistor 13 and the pair of upper electrodes 12 when a surge voltage is applied can be prevented. It can be seen that the rate of change of the resistance value after application is small, whereby a square chip resistor having excellent surge resistance can be obtained.

As described above, by adopting the structure shown in the embodiment of the present invention, a pair of upper electrodes 12 can be formed.
The distance between the pair of upper electrodes 12 of the resistor 13 and the pair of upper electrodes 12 can be increased by the gap between the resistor 13 and the pair of upper electrodes 12. Is applied to the resistor 13
In addition to the above, it is possible to suppress the discharge generated between the upper electrode 12 and the pair of upper electrodes 12, thereby preventing the breakdown and deterioration of the insulation between the resistor 13 and the upper electrode 12 and to make the shape of the resistor 13 meandering. By doing so, the length of the resistor 13 can be increased, so that the contact area between the resistor 13 and the substrate 11 increases, and the heat generated by the resistor 13 can be efficiently released to the substrate 11. It is possible to suppress heat generation of the resistor 13 when a surge voltage is applied,
As a result, it is possible to obtain an effect that a square chip resistor having excellent surge resistance can be obtained.

Further, since the portion of the resistor 13 facing the pair of upper electrodes 12 is located inside the substrate 11 from the tip of the projection 12a provided on the pair of upper electrodes 12, the pair of resistors 13 The distance between the portion facing the upper surface electrode 12 and the pair of upper surface electrodes 12 can be further increased, whereby even when a surge voltage is applied to both ends of the rectangular chip resistor, the resistor 13 and the pair Top electrode 1
Since the discharge generated between the two elements can be further suppressed, the resistor 1
Breakdown and deterioration of insulation between the third electrode 3 and the pair of upper electrodes 12 can be more effectively prevented, and as a result, an effect of providing a square chip resistor having more excellent surge resistance can be obtained.

In the above-described embodiment of the present invention, the resistor 13 has a meandering shape. However, the resistor 13 has an S-shape as shown in FIG. Alternatively, as shown in FIG.
By providing the laser trimming 16 on the resistor 3, the shape of the resistor 13 may be S-shaped or meandering.

[0029]

As described above, the rectangular chip resistor of the present invention is provided at both ends of the substrate and the upper surface of the substrate, and protrudes toward the inside of the substrate along the upper surface of the substrate. A pair of upper surface electrodes having a convex portion formed thereon, and a pair of upper surface electrodes located between the pair of upper surface electrodes and electrically connected to the pair of upper surface electrodes at the convex portions; and a gap between the pair of upper surface electrodes. According to this configuration, the gap between the pair of upper electrodes and the resistor allows the resistor to face a portion of the resistor that faces the pair of upper electrodes. Since the distance between the pair of upper electrodes can be increased, even when a surge voltage is applied to both ends of the rectangular chip resistor, the discharge generated between the resistor and the pair of upper electrodes can be suppressed. Between the resistor and a pair of upper electrodes Destruction of insulation, it is possible to prevent the deterioration, in which advantageous effect of providing excellent rectangular chip resistor surge characteristics can be obtained.

[Brief description of the drawings]

FIG. 1 is a top view of a square chip resistor according to an embodiment of the present invention.

FIGS. 2A to 2D are process diagrams showing a method of manufacturing a square chip resistor.

FIG. 3 is a circuit diagram showing a measuring circuit used for measuring a rate of change in resistance value after application of a surge voltage.

FIG. 4 shows a result of measuring a resistance value change rate after applying a surge voltage for a conventional square chip resistor and a square chip resistor according to an embodiment of the present invention using the measurement circuit shown in FIG. Figure showing

FIG. 5 is a top view of a square chip resistor according to an embodiment of the present invention in which the shape of the resistor is S-shaped.

FIG. 6 is a top view of a square chip resistor according to an embodiment of the present invention in which the resistor is formed into an S-shape or meandering shape by providing laser trimming on the resistor;

FIG. 7 is a plan view of a conventional square chip resistor.

FIG. 8 is a perspective view in which a part of the square chip resistor is cut away.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Substrate 12 Upper surface electrode 12a Convex part 13 Resistor

Continued on the front page (72) Inventor Shuji Ariga 1006 Kazuma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. F term (reference) 5E033 AA18 AA27 BB02 BD02 BE01 BG02 BH02

Claims (3)

[Claims] 1. A substrate, and a pair of upper surface electrodes provided at both ends of an upper surface of the substrate and formed with convex portions protruding toward the inside of the substrate along the upper surface of the substrate. It is located between the pair of upper electrodes, and is electrically connected to the pair of upper electrodes at the protrusions, and is further provided so as to form a gap between the pair of upper electrodes and a portion facing the pair of upper electrodes. A square chip resistor with a resistor. 2. The square chip resistor according to claim 1, wherein the resistor has a meandering shape. 3. The square chip resistor according to claim 1, wherein a portion of the resistor facing the pair of upper electrodes is located inside the substrate from a tip of a protrusion provided on the pair of upper electrodes.