JPH11214206A - Network resistor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a network resistor capable of preventing damage due to thermal stress, etc., after mounting the network resistor on a printed board. SOLUTION: In a network resistor 11 consisting of a plurality of resistors 14 arranged in parallel on at least one surface of an insulating board 13, and electrodes 15 formed on the insulating board in correspondence to both the ends of each resistor, grooves 20 are formed on the surface of the insulating board 13 located between resistor elements consisting of the resistors 14 and the electrodes at both the ends of the resistors 14. Thereby, when thermal stress is applied to the network resistor mounted on a printed board, damage such as crack is generated mostly along the grooves, etc., which prevents damage to the individual resistor elements.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a network resistor in which a plurality of surface mount type chip resistors are integrated into one chip, and more particularly, to preventing damage caused by stress such as heat after mounting on a printed circuit board. Regarding network resistors that can.

[0002]

2. Description of the Related Art With the recent miniaturization of electronic devices, various electronic components mounted on a printed circuit board constituting an electrical component of the electronic device have been increasingly mounted at a high density. Among these electronic components, the use frequency of a surface mount component called a network resistor in which a plurality of surface mount type chip resistors are integrated into one chip is increasing. FIG. 2 is a perspective view of such a conventional network resistor. The network resistor 1 includes a plurality of resistor elements (chip resistors) 2.
Are connected in parallel. In each of the resistor elements 2, a resistor 4 such as a thick-film resistor is arranged in parallel on the surface of one insulating plate 3, and both ends of each of the resistor elements 2 Has a configuration in which the electrodes 5 each made of a thick film conductor are integrated. When the network resistor 1 is mounted on a printed circuit board, reflow connection or the like is performed to connect the electrodes 5 of the individual resistor elements 2 to wiring patterns on the printed circuit board.

[0003]

However, as the number of the resistor elements increases, the network resistor 1 is more likely to be damaged by heat or other stress after being mounted on a printed circuit board. That is, when thermal stress is applied to the printed circuit board, the constituent materials of the resistor element 2 and the solder for connecting the network resistor 1 on the wiring pattern of the printed circuit board are different from each other. In addition, breakage such as a crack may occur in the resistor 4 of each resistor element 2 constituting the network resistor or the insulating plate, or the solder connection may be peeled off, so that the resistor cannot be used as a resistor. I do. An object of the present invention is to provide a network resistor that can prevent damage caused by stress such as heat after mounting the network resistor on a printed circuit board.

[0004]

In order to achieve the above-mentioned object, the invention of claim 1 comprises a plurality of resistors arranged in parallel on at least one surface of an insulating plate, and insulating members corresponding to both ends of each resistor. An electrode formed on a plate, a network resistor comprising the above-described resistor and a resistor element comprising electrodes at both ends of the resistor;
It is characterized in that a groove or the like is formed. The invention of claim 2 is
The groove or the like is a perforation.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments shown in the drawings. 1 (a), 1 (b) and 1 (c) are a plan view and a front view showing an example of the configuration of a network resistor according to an embodiment of the present invention, and an equivalent circuit diagram thereof. The network resistor 11 has a configuration in which a plurality of resistor elements (chip resistors) 12 are connected in parallel.
Reference numeral 2 has a configuration in which a resistor 14 made of a thick film resistor or the like is formed on the surface of one insulating plate 13 and electrodes 15 are integrated on the surfaces of the insulating plate corresponding to both ends of the resistor 14. The surface of the insulating plate 13 is exposed and electrically isolated between the adjacent resistor elements 12. The difference of the network resistor 11 from the above-described conventional example is that a groove 20 is formed on the surface of the insulating plate exposed between the resistor elements 12. The groove 20 of this embodiment has a V-shaped groove arranged symmetrically on both upper and lower surfaces of the insulating wall 13a.
The grooves may be provided on one of the upper and lower surfaces, or may be provided on the upper surface and the lower surface alternately. The groove 20 may be configured to extend continuously over the entire length of the network resistor in the width direction as shown in the figure, or may be configured to be intermittent. Further, as the cross-sectional shape of the groove 20, various forms such as a square groove, a round groove and the like can be considered. Also, small through holes (or small-diameter recesses) may be formed in a row in a perforated manner by a laser scriber or the like instead of the grooves. In short, by mounting the network resistor on the printed circuit board, the network resistor is likely to be easily damaged due to thermal stress or the like. It is characterized by a configuration in which breakage of other portions, particularly the resistor 14 due to breakage or cracking is prevented. In the claims, the groove or the like includes a perforation or the like in addition to a pure groove. When the network resistor 11 is mounted on a printed circuit board, reflow connection or the like is performed to connect the electrodes of the individual resistor elements 12 to the wiring patterns on the printed circuit board.

Next, FIGS. 2A to 2E are diagrams showing the procedure for manufacturing the network resistor of the present invention. First, two opposite sides of the insulating plate 13 shown in FIG. A plurality of recesses 25 are formed as shown in (b), and then grooves 20 and the like are formed so as to partition adjacent recesses 25 as shown in (c). Subsequently, as shown in (d), a film thickness resistor 14 is formed on the region on the insulating plate partitioned by the grooves 20 and the like.
As shown in (e), a conductor film to be the electrode 15 is formed at the end of the insulating plate corresponding to both ends of each film thickness resistor 14. As described above, in the present invention, by connecting the individual resistor elements 12 by the easily breakable portions of the grooves 20 or the like, it is possible to prevent the resistor elements themselves from being damaged when mounted on a printed circuit board. This can be prevented beforehand, and even if damage such as cracks along the groove 20 or the like occurs, it is possible to eliminate the influence on the functions of the individual resistor elements constituting the network resistor.

[0007]

As described above, according to the present invention, it is possible to prevent breakage caused by stress such as heat after mounting a network resistor on a printed circuit board. That is, in the present invention, a plurality of resistor elements are connected to each other via an insulating region.
In the networked resistor in the form of a chip, a groove or the like is formed in an insulating plate for holding the resistor element to separate the resistor element from each other, and cracks and the like are easily broken along the groove and the like. When thermal stress is applied to a network resistor mounted on a printed circuit board, breakage such as cracks mainly occurs along a groove or the like, and individual resistor elements do not break. Therefore, the reliability of an electronic device using such a network resistor can be improved.

[Brief description of the drawings]

1A, 1B, and 1C are a plan view, a front view, and an equivalent circuit diagram of a network resistor according to an embodiment of the present invention.

FIGS. 2A to 2E are diagrams illustrating a procedure for manufacturing a network resistor according to the present invention.

FIG. 3 is an explanatory diagram of an example of a configuration of a conventional network resistor.

[Explanation of symbols]

11 network resistor, 12 resistor element, 13
Insulation plate, 14 resistor (thick film resistor), 15 electrodes, 20
Grooves and the like.

Claims (2)

[Claims] 1. A network resistor comprising: a plurality of resistors arranged in parallel on at least one surface of an insulating plate; and electrodes formed on the insulating plate corresponding to both ends of each resistor. A network resistor, wherein a groove or the like is formed on the surface of an insulating plate located between a resistor element comprising a resistor and electrodes at both ends of the resistor. 2. The network resistor according to claim 1, wherein the groove or the like is a perforation.