JPH01302801A - Printed resistor - Google Patents

Abstract

PURPOSE:To make it possible to achieve shortening of a plural trimming time, improvements in mounting density, and simplification of software by trimming a plurality of resistors laminate via an insulation layer at one time. CONSTITUTION:A long length of resistor 17 is formed from a plurality of resistors 13, 15 by electrically connecting respective resistors 13, 15 to the ends connected to a first electrode 14 of to the end at the side opposite to the electrode 14, consisting of a plurality of resistors 13, 15 laminated in turn via an insulation layer 16 and first/second electrodes 14, 12 connected to the ends of the most upperlayer and underlayer of those resistors respectively. The resistance value is adjusted by trimming 18 respective resistors 13, 15 and the insulation layer 16 at the same time. This makes it possible to achieve shortening of a trimming time, improvements in mounting density, and simplification of software.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION Field of Industrial Application The present invention relates to improvements in printed resistors used in hybrid integrated circuit boards.

(Prior Art) As is well known, a printed resistor is usually formed by printing a resistor on an insulating substrate and trimming the resistor to a desired resistance value using laser light or sandblasting. By the way, several methods are known regarding the shape of trimming. In FIG. 5, one trimming groove 3 is formed while trimming the resistor 2 between the electrode conductors 1a and lb along the direction of narrowing the current path to obtain a desired resistance value.

However, if you only want to adjust the resistance value of the printed resistor obtained in this way, a single trimming groove as shown in FIG. In order to ensure current capacity, it is necessary to provide a plurality of trimming grooves and leave a certain amount of remaining space for the printed resistor. FIG. 6 shows that by sequentially forming two trimming grooves 4a and 4b in the resistor 2,
This is intended to more accurately adjust the desired resistance value. In addition, in Fig. 6, the groove 4 to be trimmed first
The groove a is coarsely adjusted, and the groove 4b to be trimmed later is finely adjusted, and the change in resistance value is smaller than that of the trimmed groove 4a. Also,
FIG. 7 shows an attempt to more accurately adjust the desired resistance value by forming an L-shaped trimming groove 5 in the resistor 2. In FIG. In addition, in FIG. 7, among the trimming grooves 5, the trimming groove 5a in the direction of narrowing the current path is as follows.
The change in resistance value is larger than that of the trimming groove 5b which is perpendicular to this groove.

However, as shown in FIG. 6, two trimming grooves 4a,
When forming 4b, trimming is not just one movement;
In addition to having to change the irradiation position of the trimming medium for trimming, problems arise such as slowing down the trimming process, reducing packaging density, and complicating the trimming software.

Furthermore, when forming the L-shaped trimming groove 5 as shown in FIG. 7, the speed in the trimming process may be slow, or
Problems such as increased complexity also occur in the trimming software.

The present invention has been made in view of the above circumstances, and by trimming multiple resistors laminated via insulating layers at once, the time for multiple trimming can be shortened, packaging density can be improved, and software can be simplified. The purpose is to provide a printed resistor that can also realize the following.

[Structure of the Invention] (Means for Solving the Problems) The present invention comprises a plurality of resistors sequentially stacked with an insulating layer interposed therebetween, and ends of the uppermost layer and the lowermost layer of these resistors. a first electrode and a second electrode connected to the first electrode, and the end portions connecting each of the resistors to the first electrode, or the end portions connecting to the first electrode; At least one of the opposite ends is electrically connected to form one elongated resistor from the plurality of resistors, and
The gist of the present invention is to adjust the resistance value by trimming each of the resistors and the insulating layer at the same time.

(Function) In the present invention, since the printed resistor has the above structure, the electrically integrated resistor has a shape as if one resistor was folded.

Therefore, by trimming the resistor and insulating layer stacked above and below at the same time, the same effect as forming multiple trimming grooves can be obtained by forming one trimming groove. It is possible to shorten trimming time, achieve high-density packaging, and even simplify software while securing capacity.

(Example) Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 4.

11 in the figure is an insulating substrate made of, for example, alumina. On this insulating substrate 11, a first resistor 13 whose one end (left end in the figure) is connected to the electrode conductor 12 is formed by printing. On this first resistor 13 is a second resistor 1 whose one end (the left end in the figure) is connected to the electrode conductor 14.
5 is formed by printing with an insulating layer 16 interposed therebetween. Here, the second resistor 15 is the same as the first resistor 13.
It is in direct contact with the end (right end in the figure) and is electrically integrated. In other words, the resistor 13.15
As shown in FIG. 3, it has a shape as if one long resistor 17 was folded into itself. Note that 18 in the figure indicates second resistors 15. which overlap each other. This is a trimming groove formed in the insulating layer 16 and the first resistor 13.

In a printed resistor having such a structure, in order to obtain a printed resistor having a desired resistance value, the second resistors 15. The insulating layer 16 and the first resistor 13 are trimmed at once in the direction along the longitudinal direction of the electrode conductor 12 (or 14) to form the trimming groove 1.
Do this to form 8.

The printed resistor according to the above embodiment is formed on the first resistor 13 with an insulating layer 16 interposed therebetween, and a part of the resistor
A second resistor 15 is formed directly on the resistor 13 and is electrically integrated with the resistor 13. By simultaneously trimming the first and second resistors 13, 15 and the insulating layer 16, Since the configuration is configured to adjust the value, it has the following effects. That is, with one trimming, the same effect as when two trimming grooves 18 are formed in one long resistor 17 as shown in FIG. 3 can be obtained, so the trimming time can be shortened and the conventional example ( (Illustrated in Figure 5)
Compared to the previous case, it is possible to implement high-density packaging while solving problems related to current capacity.

Further, there is no need to perform trimming by changing the irradiation position of the trimming medium, unlike the conventional method (FIG. 6).

Furthermore, the complexity of the trimming software can be avoided.

Note that the printed resistor according to the present invention is not limited to those of the above-mentioned embodiments. For example, the structure described below may be used.

(1) Second resistors 15 overlapping each other as shown in FIG. A printed resistor having a structure in which an L-shaped trimming groove 19 is provided in an insulating layer 16 and a first resistor 13. In the case of this structure, fine adjustment of the resistance value becomes possible, and the shape becomes as if 17 long resistors were folded into 5 pieces, as shown in FIG.

(2) As shown in FIG. 10, third resistors 20. Insulating layer 21. Second resistor 15, insulating layer 1
6 and the first resistor 13 are provided with a trimming groove 10 of a three-layer structure. However, in FIG. 10, the third resistor 20 and the second resistor 15 are in direct contact at the left end in the figure.

When a printed resistor with this structure is developed, it becomes as shown in FIG. 11.

(3) A printed resistor with a three-layer structure in which an L-shaped trimming groove 19 is provided in the three-layer resistor as shown in FIG. 1st
Figure 3 shows a developed view of this printed resistor.

Further, 1. The printed resistance value according to the present invention is not limited to the case where two or three layers of resistors are laminated, but may be the case where four or more layers of resistors are laminated.

[Effects of the Invention] As detailed above, according to the present invention, problems related to current capacity can be solved, as well as a highly accurate system that can shorten trimming time, improve packaging density, and even simplify software. Printed resistors can be provided.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a printed resistor according to an embodiment of the present invention;
Fig. 2 is a schematic perspective view of the same printed resistor, Fig. 3 is a developed view of Fig. 1, Fig. 4 is a sectional view taken along the line X-X of Fig. 1, and Figs. 5 to 7 are respectively FIG. 8 is a plan view of a conventional printed resistor, FIG. 8 is a perspective view of a printed resistor according to another embodiment of the present invention, FIG. 9 is a developed view of FIG. 8, and FIG. 10 is another embodiment of the present invention. A schematic perspective view of a printed resistor according to an example, FIG. 11 is a developed view of FIG. 10,
FIG. 12 is a schematic perspective view of a printed resistor according to still another embodiment of the present invention, and FIG. 13 is a developed view of FIG. 12. 11... Insulating substrate, 12.14... Electrode conductor, 13
゜15.20...Resistor, 16.21...Insulating layer,
17...Long resistor, 18.19...Trimming groove. Applicant's Representative Patent Attorney Takehiko Suzue Figure 6 Figure 8 Circle Figure 9 Figure 10 Figure 11 Figure 12 Figure 13

Claims (1)

[Claims] It consists of a plurality of resistors stacked in sequence through insulating layers, and first and second electrodes connected to the ends of the uppermost and lowermost resistors among these resistors, respectively. The ends of each resistor connected to the first electrode, or the first
One elongated resistor is configured from the plurality of resistors by electrically connecting at least one of the ends connected to the electrodes and the opposite ends thereof, and each of the resistors and A printed resistor characterized by adjusting the resistance value by trimming the insulating layer and the insulating layer at the same time.