JPH0590003A - Chip resistor - Google Patents

Abstract

PURPOSE:To provide a square chip resistor which can increase a power capacity. CONSTITUTION:Resistance members 2, 2A are arranged and installed on both face parts of an insulating member 1; the resistance members 2, 2A are connected in parallel; terminal members 5, 5A which constitute an input stage and an output stage for the resistance members 2, 2A are provided on the outer circumferential part of the insulating member 1. Thereby, it is possible to provide an excellent chip resistor which can make a circuit board effectively small and which is not available in conventional cases.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip resistor,
Particularly, the present invention relates to a rectangular chip resistor suitable for a high-density mounting circuit.

[0002]

2. Description of the Related Art In recent years, with the miniaturization and higher functionality of electronic equipment, the packaging density of the circuits that make up the electronic equipment has increased at an accelerating pace. Many chip resistors are used.

A cross section of a conventional small-sized rectangular chip resistor is shown in FIG. In FIG. 3, the surface electrodes 114, 114A are first formed on both left and right ends of one upper surface of the square chip-shaped alumina ceramic substrate 111 by a screen printing method or the like.
Then, a ruthenium oxide-based resistor 112 connected to the left and right surface electrodes 114 and 114A is formed in the center of the upper surface of the alumina ceramic substrate 111. Further, both ends of the alumina ceramic substrate 111 are connected to the U-shaped electrodes 115, 1 from the upper portions of the surface electrodes 114, 114A.
15A is provided, and a protective glass layer 113 for protecting the resistor is arranged above the ruthenium oxide-based resistor 112 located between the electrodes 115 and 115A.

[0004]

However, in the conventional square chip resistor of the conventional example, the area where the resistor is formed is reduced in proportion to the progress of miniaturization, and accordingly, the square chip resistor is also reduced. The power capacity tolerated by is also reduced, and the size of the resistor is about 0.5X0.3 [mm] in the ultra-small size 1005 chip [outside dimension 1.0mmX0.5mm]. The capacity of 32 [W] was the limit. Further, miniaturization of the resistor also causes miniaturization of the resistor, so that there is also a disadvantage that a change in operating environment (temperature change) greatly affects the accuracy of the resistance value.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a square chip resistor capable of improving the disadvantages of the conventional example and, in particular, increasing the power capacity.

[0006]

According to the present invention, a resistance member is provided on both sides of an insulating member, the resistance members are connected in parallel, and terminals forming an input stage and an output stage of the resistance member are provided. The structure is such that the member is provided on the outer peripheral portion of the insulating member. This aims to achieve the above-mentioned object.

[0007]

Function: The resistance members arranged on both sides of the insulating member are formed in a parallel circuit.

[0008]

[First Embodiment] An embodiment of the present invention will be described below with reference to FIG. FIG. 1 shows a cross section of a square chip resistor according to this embodiment. In the figure, reference numeral 1 indicates a rectangular chip-shaped alumina ceramics substrate which is the base of a square chip resistor. Surface electrodes 4A, 4B and 4C, 4D are first formed on both ends of the upper and lower surfaces of the alumina ceramics substrate 1 by a screen printing method or the like, and then, the surface electrodes 4A, 4B, 4C, 4D are formed. Ruthenium oxide-based thick film resistors 2, 2 to engage
A is formed in the center of the upper and lower surfaces of the alumina ceramic substrate 1.

Further, the surface electrodes 4A, 4B, and 4C, 4D
There are provided U-shaped electrodes 5 and 5A for holding both ends of the alumina ceramics substrate 1 from above. Therefore, the thick film resistors 2 and 2A formed on the upper and lower surfaces of the alumina ceramic substrate 1 are connected in parallel by the electrodes 5 and 5A. And this electrode 5, 5A
The ruthenium oxide type resistors 2 and 2A disposed between the two are provided with protective glass layers 3 and 3A for protecting the resistors.

[0010]

[Second Embodiment] A second embodiment will now be described with reference to FIG. Further, the same reference numerals are used for the same constituent members. FIG. 2 shows a cross section of the square chip resistor according to the present embodiment. In the figure, the square chip resistor according to this embodiment has the same configuration as that of the first embodiment described above, except that the thick film resistors 10 and 11 formed on both surfaces of the alumina ceramic substrate 1 have the same structure. The characteristic is that it uses a resistor whose temperature characteristics are positive and negative. According to this, the resistance values in which the thick film resistors 10 and 11 are arranged in parallel are different from each other due to the temperature change because the resistor 10 having a positive temperature characteristic and the resistor 11 having a negative and negative characteristic are used. Since they cancel each other out, it is possible to provide a small chip resistor that is less prone to temperature changes.

Although the thick film resistors are formed on the two surfaces of the alumina ceramic substrate in the above embodiment, the present invention is not limited to this, and the thick film resistors are also formed on the other surfaces. A resistor may be formed.

[0012]

Since the present invention is constructed and functions as described above, according to this, a resistance member is provided on both surface portions of the insulating member, the resistance members are connected in parallel, and Since the terminal member constituting the input stage and the output stage is provided on the outer peripheral portion of the insulating member, the alumina ceramic substrate as the insulating member is provided with the ruthenium oxide-based thick film resistor as the resistive member. It is configured by connecting in parallel. As a result, when the resistance values of the two resistance materials are the same, the power capacity of the chip resistor is doubled, and only one chip resistor in the circuit section, which used two chip resistors in parallel, is sufficient. Therefore, one chip resistor of this circuit portion and the wiring portion of this resistor are unnecessary, and the area occupied by the chip resistor is less than half of the conventional area. Therefore, it is possible to provide an excellent chip resistor that does not exist in the prior art and that effectively downsizes the circuit board.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing another embodiment.

FIG. 3 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

1 Alumina ceramics substrate as an insulating member 2, 2A Ruthenium oxide-based thick film resistor as a resistive member 5, 5A End face electrode as a terminal member

Claims (2)

[Claims] 1. A resistance member is provided on both sides of the insulating member,
A chip resistor, characterized in that the resistance members are connected in parallel, and a terminal member constituting an input stage and an output stage of the resistance member is provided on an outer peripheral portion of the insulating member. 2. The resistance member is formed by using members having different resistance temperature characteristics from each other.
The listed chip resistor.