JPH0413841B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an independent resistance network in which a plurality of independent resistance circuits used in various electronic devices are combined into one block, and relates to the production of fine pitch independent resistance circuits. It is about the method.

BACKGROUND ART In recent years, there has been a remarkable movement towards making various electronic devices lighter, thinner, shorter and smaller, and the packaging density of resistors as passive elements has also been greatly improved due to the use of chips and complex networks. In particular, for resistor networks in which multiple resistors are formed on the same insulating substrate, the pitch between terminals is 2.54mm, 1.78mm, 1.27mm.
With the shrinking of the pitch to mm, there is a demand for products with lower profile such as chip-type multi-terminal resistor networks and mini-flat packages.

The independent resistor circuit pattern in the conventional resistor network as described above will be explained below with reference to the drawings.

FIG. 4 shows a conventional independent resistance circuit pattern. In FIG. 4, 1 is an insulating substrate, 2 is a plurality of conductors formed on the insulating substrate 1, and 3 is a resistor formed between the conductors 2 facing each other.

The independent resistance circuit pattern configured as described above is used for laser trimming while measuring the resistance value at both ends by setting a probe on the conductor 2 as necessary. Further, a lead terminal (not shown) is inserted into the conductor 2 portion and then soldered to connect it to the printed circuit board.

Problems to be Solved by the Invention However, in such a configuration, in order to make the pitch spacing finer, there is no other way than shortening the width dimensions of the conductor 2 and the resistor 3 and the spacing between them as shown in FIG. However, mass production was difficult for the following reasons. That is, firstly, when the width dimension of the conductor 2 is reduced, there is not enough space for the laser meter reading land, resulting in poor contact of the laser meter reading. Second, when the width dimension of the resistor 3 and the interval between them are reduced, there is no dimensional margin for the laser beam irradiation position during printing misalignment during pattern formation and laser correction, and the laser beam is irradiated onto adjacent resistors, resulting in the desired trimming resistance value cannot be obtained.

As mentioned above, the conventional configuration has the problem that it is very difficult to obtain small pitch intervals by simply reducing the width and spacing of the conductor and resistor.

In view of the above-mentioned drawbacks, an object of the present invention is to provide a method for manufacturing a fine pitch independent resistance circuit, which can provide sufficient space for conductor electrode land for laser correction meter reading and ensure dimensional margin for the laser beam irradiation position. That is.

Means for Solving the Problems In order to achieve this object, the method for manufacturing a fine pitch independent resistor circuit of the present invention involves forming a plurality of resistors on an insulating substrate in the same direction as connecting the electrodes at both ends of the resistor. A conductor is provided, and the electrodes at both ends of a plurality of resistors are connected to the conductor to form a plurality of independent resistance circuits, and the resistors located closest to each other are staggered between the independent resistance circuits. In addition, independent resistance circuits are arranged in multiple stages so that each conductor is drawn out to opposite ends of the insulating substrate to constitute a fine pitch independent resistance circuit section, and the conductor is connected to the insulating substrate adjacent to the insulating substrate through a dividing slit. A dummy land portion having first and second common conductors and first and second conductor electrode land groups for laser correction meter reading is provided on the first and second dummy insulating substrates so as to be connected to the conductor, respectively. Among the conductors of the fine pitch independent resistance circuit section, the odd-numbered conductors from the end are connected to the first common conductor and the second conductor electrode land group, and the even-numbered conductors are connected to the first conductor electrode land group. and a second common conductor to form a fine pitch independent resistance circuit pattern, and in this fine pitch independent resistance circuit pattern, the first and second common conductors and the first and second conductor electrode land groups are connected to each other. The resistor is laser trimmed so that the resistance value of the resistor becomes a desired value by applying a probe to the resistor, and then the resistor is divided by the dividing slit.

Operation According to this method, each independent resistance circuit is arranged in multiple stages in a staggered manner, and the laser correction of the resistor is performed in a direction crossing the electrode direction of the resistor, so that adjacent resistors are Without cutting with a laser beam, it is possible to form an independent resistance circuit with fine pitches while ensuring a sufficient dimensional accuracy margin of the laser beam. In addition, by providing a common conductor and a group of conductor electrode lands for laser correction meter reading on the dummy insulating board, the number of conductor electrode lands on the dummy insulating board can be half the number of resistors, making it possible to achieve fine pitch. regardless of,
Sufficient space is provided for the conductive electrode land for laser corrected meter reading, and contact failures in laser meter reading will no longer occur.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a fine pitch independent resistor circuit pattern in one embodiment of the present invention. 1st
In the figure, 4 is an insulating substrate, 5 is a plurality of conductors formed on the insulating substrate 4, and 6 is the opposing conductor 5.
A resistor is formed between the two. Here, resistor 6
The conductor 5 is connected in the same direction as the direction in which the electrodes at both ends of the conductor 5 are connected. A plurality of independent resistance circuits constituted by these resistors 6 and conductors 5 are arranged in a staggered three-stage structure, and the resistors 6 located closest to each other are arranged in a staggered manner, so that minute pitches are independent. It constitutes a resistance circuit section. 7a and 7b are first and second dummy insulating substrates adjacent to the insulating substrate 4;
a and 8b are first and second common conductors formed on the dummy insulating substrate 7, and one of the ends of the conductor 5 of each independent resistance circuit is connected to the first and second common conductors 8a and 8b. Commonly connected to either. 9a and 9b are first and second conductive electrode lands for laser correction meter reading formed on the first and second dummy insulating substrates 7a and 7b, and the remaining ends of the conductor 5 of each independent resistance circuit are individually connected and form a dummy land portion. Reference numeral 10 denotes a dividing slit which separates the insulating substrate 4 provided with the fine pitch independent resistance circuit section from the dummy insulating substrates 7a and 7b provided with the dummy land sections. More specifically, among the conductors 5 of the fine pitch independent resistance circuit, the odd-numbered conductors 5 from the end are connected to the first common conductor 8a and the second conductor electrode land 7b, and the even-numbered conductors are connected to the first common conductor 8a and the second conductor electrode land 7b. The conductor electrode land 7a and the second common conductor 8b are connected to each other.

The fine pitch independent resistor circuit pattern configured as described above includes the first and second common conductors 8a and 8.
b, and by placing meter readings on the first and second conductive electrode lands 9a and 9b for laser correction meter reading,
While measuring the resistance value, laser trimming is performed on the resistor 6 in order to obtain a desired resistance value. The direction of this trimming is a direction that intersects with the direction of the electrodes of the resistor 6. Therefore, during trimming, the resistor 6 is not placed adjacent to the trimmer in that direction, so the resistor 6 is not cut by the laser beam. Next, the substrate is divided at the dividing slit 10, the first and second dummy insulating substrates 7a and 7b are removed, and fine pitch independent resistance circuits are formed.

FIG. 2 shows first and second dummy insulating substrates 7a,
This is a fine pitch independent resistance circuit obtained by removing 7b. In addition, in Figures 1 and 2, 11
is an electrode for taking out an external signal extending from the conductor 5, and serves as a terminal portion during mounting.

FIG. 3 shows an example of a method for mounting a fine pitch independent resistance circuit according to the present invention. In FIG. 3, 12 represents a printed circuit board, and 13 represents a copper foil formed on the printed circuit board 12. In FIG. 14
is a soldered part attached to the printed circuit board 12.

In this embodiment, the independent resistance circuits are arranged in a staggered three-stage structure, but it goes without saying that a four-stage staggered or five-stage staggered arrangement may be used as long as the component dimensions permit.

Effects of the Invention As described above, the present invention has an arrangement in which independent resistance circuits each including a conductor on an insulating substrate and a resistor formed between the conductors are arranged in multiple stages in a staggered manner. It is possible to form a fine pitch independent resistance circuit without cutting with a laser beam, while ensuring a sufficient dimensional accuracy margin for the laser beam irradiation position. In addition, by providing a common conductor and a conductor electrode land for laser correction meter reading on a dummy insulating substrate separated from the insulating substrate by a dividing slit, it is possible to make the conductor electrode land for laser correction meter reading independent of minute pitches. Sufficient space is obtained, and a conductor electrode land for laser correction meter reading can be configured with a dimensional margin twice the pitch of the conductor on the insulating substrate. For this reason, the occurrence of contact failure in laser meter reading will no longer occur.

As described above, the manufacturing method of the present invention has great practical effects.

[Brief explanation of drawings]

FIG. 1 is an enlarged plan view illustrating a fine pitch independent resistor circuit pattern according to an embodiment of the present invention, FIG. 2 is a plan view showing the configuration of the same resistor circuit pattern after removing the dummy insulating substrate, and FIG. 4 is a sectional view showing an example of mounting a fine pitch independent resistance circuit obtained by the present invention, and FIG. 4 is a plan view of a conventional independent resistance pattern. 4... Insulating substrate, 5... Conductor, 6... Resistor,
7a, 7b...first and second dummy insulating substrates, 8
a, 7b...first, second common conductor, 9...7
a, 7b First and second conductive electrode lands for laser correction meter reading, 10... slit for division, 11...
External signal extraction electrode, 12... printed circuit board,
13...Copper foil, 14...Soldering part.

Claims (1)

[Claims] 1. A plurality of conductors are provided on an insulating substrate in the same direction as the direction in which the electrodes at both ends of the resistor are connected, and the electrodes at both ends of the plurality of resistors are connected to the conductors to form a plurality of independent resistance circuits. The independent resistance circuits are arranged in multiple stages so that the resistors located closest to each other between the independent resistance circuits are staggered and each conductor is drawn out to opposite ends of the insulating substrate. First and second common conductors constituting a fine pitch independent resistance circuit section and connected to the conductor on first and second dummy insulating substrates adjacent to the insulating substrate through dividing slits, respectively. and a dummy land portion having first and second conductive electrode land groups for laser correction meter reading,
Among the conductors of the fine pitch independent resistance circuit section, the odd-numbered conductors from the end are the first common conductor and the second common conductor.
The even-numbered conductors are connected to the first conductor electrode land group and the second common conductor to form a fine pitch independent resistance circuit pattern, and in this fine pitch independent resistance circuit pattern, , after applying a probe to the first and second common conductors and the first and second conductor electrode land groups and performing laser trimming so that the resistance value of the resistor becomes a desired value, the dividing A method for manufacturing a fine pitch independent resistance circuit characterized by dividing it with slits.