JP2002343614A - Multi-electrode type resistor for surface mounting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the flexibility of pattern design by using resistors with the same resistance value between any electrodes, in a multi-electrode type resistor for surface mounting. SOLUTION: This resistor comprises a ceramic board 2, four electrodes 1a to 1d arranged respectively on four sides of the ceramic board 2, two resistors 3a and 3b with the same resistance value that are formed crossing each other at an intermediate point between facing two electrodes on the opposite two sides, the electrodes 1a and 1c and the electrodes 1b and 1c, and a protective coat 4 made of insulator for protecting the resistors 3a and 3b. As shown in Fig. 1, the resistance valve of resistor 3a or of 3b will be shown between any electrodes. The ceramic board 2 may be of a small shape or polygonal in shape. In addition, by subjecting a crossed part of resistors to electrode formation, the current concentration is averaged out, and a sub-electrode is provided to improve the flexibility of pattern design and can also be used as a set resistor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-pole resistor for surface mounting, and more particularly to a multi-pole resistor having four or more electrodes in order to give a degree of freedom in pattern design on a circuit board when mounted on a circuit board or the like. The present invention also relates to a multi-pole type surface mount resistor capable of obtaining the same resistance value between any two electrodes.

[0002]

2. Description of the Related Art A circuit board on which this type of multi-pole resistor for surface mounting is mounted usually requires high-density mounting, and the wiring pattern becomes congested and becomes a high-density wiring pattern. Therefore, for this type of multi-pole resistor for surface mounting, a multi-pole resistor capable of selecting a wiring position at the same time as miniaturization is desired.
In other words, it is a resistor that has multiple electrodes to which patterns can be connected from any direction and that gives a degree of freedom to the pattern design on the circuit board side.

Conventionally, as this type of multi-pole type surface mount resistor, there is, for example, a square plate type chip composite resistor described in Japanese Utility Model Laid-Open Publication No. H01-115206.

FIG. 5A is a plan view showing this conventional example.
(B) It is an equivalent connection diagram. A short ceramic substrate 51;
Main electrodes 52, 52 'formed on each of two opposing sides
And a resistor 53 formed between the main electrodes, and an intermediate electrode 54 formed between the two opposing sides of the resistor 53 and passing through an intermediate point of the resistor 53. There is.

This resistor is used as a composite resistor having a resistor 53 and an intermediate electrode 54.
A resistor having half the resistance of the resistor 53 between 2 'and the intermediate electrode 54 can be selected from four electrode positions, and the degree of freedom in pattern design can be obtained.

Another conventional example is disclosed in Japanese Patent Laid-Open Publication No.
There is a surface mount adjustment resistor described in Japanese Patent Publication No. 0004. FIG. 6A is a perspective view showing another conventional example.
(B) It is an expanded top view.

In FIG. 6, reference numeral 61 denotes a surface-mounting adjustment resistor, which is an insulator main body 62 made of ceramic or the like formed into a prism having a regular polygonal end face, for example, a cube.
And resistors 63a to 63d formed on side surfaces 62a to 62d of the insulator main body 62, and a common electrode 64 formed on one surface 62e of the insulator main body 62 and having one end of each of the resistors 63a to 63d contacted. The first to fourth electrodes 65a to 65d formed on the opposite surface 62f of the common electrode 64 and connected to the other ends of the resistors 63a to 63d, respectively.
5d. Each of the above resistors 63a to 63d
Have different resistance values and are set according to the purpose of use.

The surface mount adjustment resistor 61 is located between the first and second leads 67a and 67d formed on the circuit board 66, and is fixed by soldering. Since the surface-mount adjustment resistor 61 is a cube, it can be installed in any state on the circuit board 66, and depending on the combination, seven resistance values including 0Ω of the common electrode 64 on one surface 62e can be obtained.

As described above, the resistor 61 is connected to the circuit board 66.
However, if the resistors 63a to 63d are selected to have the same resistance value, the resistance of the electrodes 65a to 65d is changed in the mounting state shown in FIG. Any two electrodes can be used as resistors having the same resistance value. That is, since six electrode positions can be selected, a degree of freedom in wiring can be obtained in the pattern design of the circuit board 66.

[0010]

In the conventional example shown in FIG. 5, four combinations of two electrodes can be selected between two main electrodes and two intermediate electrodes. Since it cannot be used as a resistor having the same resistance value between the intermediate electrodes, there is a problem that the degree of freedom in the pattern design of the circuit board is reduced accordingly.

In the conventional example shown in FIG.
Although any two of the two electrodes can be used as a resistor having the same resistance value, six combinations within the electrode are possible, and the degree of freedom in pattern design is increased, so there is no problem in this respect. Due to the structure, there is a problem that mounting restrictions in the height direction occur when mounting on a circuit board, and the cost also increases.

The degree of freedom in pattern design will be described with reference to the conventional example shown in FIG. Main electrode 52
-Intermediate electrode 54 (upper), main electrode 52-intermediate electrode 54
(Bottom), main electrode 52'-intermediate electrode 54 (top), main electrode 5
Since a resistor having the same resistance value is formed between each of the four electrodes of the 2′-intermediate electrode 54 (lower), the circuit board side on which the resistor is mounted is densely packed and the pattern is congested. In this case, it is said that there is a degree of freedom because an electrode set located at a position where a pattern can be most easily connected can be selected from four types and used based on the congestion situation. In this conventional example, since it is not possible to use the space between the main electrode 52 and the main electrode 52 'when it is more convenient, the degree of freedom is reduced accordingly.

[0013]

A multi-pole resistor for surface mounting according to the present invention comprises a ceramic substrate having a positive n (even number) side shape, and a plurality of ceramic substrates arranged on each side of the ceramic substrate. An electrode and a plurality of resistors formed so as to intersect an intermediate point between the electrodes on each of two opposing sides are provided.

[0014] Alternatively, a short ceramic substrate, four electrodes disposed one on each side of the ceramic substrate, and a first resistor formed between the electrodes on the opposite short sides. The first electrode formed between the electrodes on opposite long sides.
And a second resistor having the same length as the first resistor and intersecting at an intermediate point of the resistor.

Alternatively, a short ceramic substrate, six electrodes disposed one by one on the short side and two electrodes on the long side of the ceramic substrate, and the electrodes formed between the opposite short side electrodes are formed. The first resistor and an intermediate point of the first resistor formed between the two pairs of electrodes having long sides opposed to each other in an oblique direction at an angle and intersecting the first resistor. And a second resistor and a third resistor having the same length.

Further, an intermediate electrode formed by using the same material as the electrode may be provided at a portion where each of the resistors intersects.

Further, an intermediate electrode formed of the same material as the electrode may be provided at a portion where the first resistor and the second resistor intersect.

Further, an intermediate electrode formed of the same material as the electrode may be provided at a portion where the first resistor intersects with the second and third resistors.

[0019] Further, a plurality of sub-electrodes arranged adjacent to each of the electrodes and a plurality of patterns for connecting the intermediate electrode and each of the sub-electrodes may be provided.

[0020]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a plan view showing a first embodiment of the present invention, (a) a plan view, (b) a sectional view, (c) an equivalent connection diagram, FIG. 2 is a plan view showing a second embodiment, and FIG. FIG. 4 is a plan view showing the third embodiment, and FIG. 4 (a) is a plan view showing the fourth embodiment, and FIG. 4 (b) is an equivalent connection diagram.

First, a first embodiment will be described with reference to FIG. As shown in FIGS. 1A and 1B, this resistor is
A regular quadrilateral ceramic substrate 2 and four electrodes 1 a to 1 d disposed on each side of the ceramic
Two resistors 3a, 3b having the same resistance value formed so as to intersect the middle point between the electrodes on the sides, that is, the electrodes 1a, 1c and the electrodes 1b, 1c, and insulation for protecting the resistors 3a, 3b And a protective coat 4 formed of a body.

As shown in FIG. 1 (c), the resistance value of the resistor 3a or 3b is shown in any one of the electrodes 1a-1b, 1a-1d and 1c-1d. That is, since the resistors 3a and 3b have the same resistance value and intersect at the intermediate point, the resistors 3a and 3b exhibit the same resistance value between any two electrodes. Therefore, when the resistor is mounted on a circuit board and used, the congestion of the pattern on the circuit board side can be checked and the wiring at the position where the wiring is most easily selected can be selected from among six types.

In this embodiment, a regular quadrilateral ceramic substrate is used. However, a polygonal ceramic substrate such as a regular hexagon may be used to further increase the number of electrodes. If this is the case, the degree of freedom in pattern design is further expanded.

Next, a second embodiment will be described with reference to FIG. The difference from the embodiment of FIG. 1 is that a short ceramic substrate is used as the ceramic substrate. That is, the short ceramic substrate 22, the four electrodes 21 a to 21 d disposed on each side of the ceramic substrate 22, and the electrodes 2 on the relatively short side
1b-21d and a resistor 23a formed between opposing long-side electrodes 21a-21c.
And a resistor 23b having the same length as the resistor 23a. It is to be noted that the portion where the resistor 23a and the resistor 23b intersect is such that the center line indicated by the chain line in each figure intersects at a slant at the center point, and the length of the center line is the same length. Meaning. The second embodiment can select and use an arbitrary resistor between the electrodes as in the embodiment of FIG. 1, but has a feature that the area of the ceramic substrate can be made smaller than that of FIG.

Next, a third embodiment will be described with reference to FIG. The difference from the embodiment of FIG. 2 is that one electrode is added to the long side of the short ceramic substrate and one resistor is further added. That is, the short ceramic substrate 32,
Six electrodes 31a-31b, one on the short side and two on the long side of the short ceramic substrate 32, and the resistor 3 formed between the electrodes 31b-31c on the opposite short side.
3a and two sets of electrodes 31 which are respectively obliquely opposed to each other
a-31d, 31b-31e, each of which intersects at an angle with an intermediate point of a resistor 33a formed between the resistors 33a and 31b.
It is composed of resistors 33b and 33c having the same length as a. The intersection of the resistor 33a and the resistors 33b and 33c means that the center lines indicated by chain lines in the figure intersect at an inclination at their respective intermediate points, and the lengths of the center lines are the same. . The third embodiment has the same features as the embodiment of FIG. 3, but has a feature that the degree of freedom in pattern design is increased by the increased number of electrodes.

In each of the embodiments shown in FIGS. 1 to 3, a portion where the resistor intersects may be formed on each side, and the electrode may be formed of the same material. For example, in FIG. 1, a portion surrounded by a dotted line where the resistors 3a and 3b intersect is converted into an electrode. By doing so, the current density of the current flowing through the area of the resistors 3a and 3b when used between the electrodes 1a and 1b can be averaged, so that the power consumption can be increased.

Next, a fourth embodiment will be described with reference to FIG. This embodiment is different from the embodiment shown in FIG. 1 in that the intersection of the resistors is formed into an electrode, and the intermediate electrode and the sub-electrode additionally provided on each side are connected in a pattern. That is, FIG.
(A) As shown in FIG.
Four main electrodes 41a to 41d and 4 arranged on each side
A plurality of sub-electrodes 41a ′ to 41d ′, an intermediate electrode 41e disposed at a portion where resistors formed between two opposing electrodes 41a-41c, and between the electrodes 41b-41d intersect, respectively. The intermediate electrode 41e and each main electrode 41a-
The resistors 43a to 43d formed between the sub-electrodes 41a and 41d are connected to the intermediate electrodes 41e and the sub-electrodes 41a 'to 41d'. This resistor is shown in FIG.
The circuit configuration shown in FIG. 1B has the following characteristics as compared with the embodiment of FIG. Any two of the main electrodes 41a to 41d can be used as a resistor having the same resistance value, and at the same time, the sub-electrodes 41a 'corresponding to the various electrodes 41a to 41d.
Similarly, a resistor having the same resistance value can be used between the two electrodes 41d to 41d '. However, in this case, the resistance value is の of that when used between the main electrodes. Also, two or more circuits can be used as the assembled resistor, and the feature is that the versatility can be expanded at the same time as the degree of freedom in pattern design is expanded. Although the present embodiment has been described with reference to a regular quadrilateral ceramic substrate, the present invention can be similarly applied to the rectangular ceramic substrate described with reference to FIGS.

[0028]

As described above, the multi-pole type surface mount resistor of the present invention has the same resistance value between any two of the multi-electrodes arranged on each side of the multi-sided ceramic substrate. Since it can be used as a device, in the pattern design on the circuit board side, it is possible to select and use two electrodes that are convenient for wiring in terms of position, and thus there is an effect that the degree of freedom in pattern design is expanded. Also, an intermediate electrode is provided at a portion where the resistor intersects,
By providing the sub-electrode connected to this, it is possible to further use the assembled resistor, so that the versatility is expanded.

[Brief description of the drawings]

FIG. 1A is a plan view, FIG. 1B is a cross-sectional view, and FIG. 1C is an equivalent connection diagram showing a first embodiment of the present invention.

FIG. 2 is a plan view showing a second embodiment of the present invention.

FIG. 3 is a plan view showing a third embodiment of the present invention.

4A is a plan view and FIG. 4B is an equivalent connection diagram showing a fourth embodiment of the present invention.

FIG. 5 is a plan view showing a conventional example.

6A is an external perspective view showing another conventional example, and FIG. 6B is a developed plan view.

[Explanation of symbols]

 1a to 1d electrode 21a to 21d electrode 31a to 31b electrode 2, 22, 32 ceramic substrate 3a, 3b resistor 23a, 23b resistor 33a, 33c resistor 41a to 41d main electrode 41a 'to 41d' sub electrode 42 ceramic substrate 43a ~ 43d resistor

Claims (7)

[Claims] 1. A positive n (even) side ceramic substrate,
A plurality of electrodes disposed one on each side of the ceramic substrate, and a plurality of resistors formed so as to intersect each other at an intermediate point between the electrodes on the opposite two sides. Characteristic multi-pole type resistors for surface mounting. 2. A short ceramic substrate, four electrodes disposed one on each side of the ceramic substrate, and a first resistor formed between the electrodes on opposite short sides. A second resistor having a length that is the same as the length of the first resistor, the second resistor intersects obliquely with an intermediate point of the first resistor formed between the electrodes on opposite long sides. A multi-pole type resistor for surface mounting, characterized by the following. 3. A short ceramic substrate, six electrodes disposed one by one on a short side and two on a long side of the ceramic substrate, and are formed between the opposite short side electrodes. The first resistor and the two long sides opposed to each other in the oblique direction
A second resistor and a second resistor having the same length as the first resistor, which obliquely intersect with an intermediate point of the first resistor formed between the pair of electrodes; A multi-pole type resistor for surface mounting, characterized by the following. 4. The multi-pole surface mount resistor according to claim 1, further comprising an intermediate electrode formed of the same material as the electrode at a portion where each of the resistors intersects. 5. The surface according to claim 2, wherein an intermediate electrode formed of the same material as the electrode is provided at a portion where the first resistor and the second resistor intersect. Multi-pole type resistors for mounting. 6. The first resistor and the second and third resistors.
The multi-pole resistor for surface mounting according to claim 4, further comprising an intermediate electrode formed by using the same material as the electrode at a portion where the resistance intersects. 7. The semiconductor device according to claim 4, further comprising: a plurality of sub-electrodes disposed adjacent to each of said electrodes; and a plurality of patterns for respectively connecting said intermediate electrode and each of said sub-electrodes. 7. A multi-pole resistor for surface mounting according to 5 or 6.