JPH0554241B2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention is a method for manufacturing a chip resistor, in which a plurality of resistors are formed on a substrate, and the substrate is broken for each resistor to obtain a chip resistor. Regarding the method.

(b) Conventional technology There are conventional methods for manufacturing chip resistors.
On one alumina substrate, slits of the same depth are provided in advance in the matrix, a resistor including an electrode and a resistor is formed in each area surrounded by the slits in the matrix, and then this substrate is broken. There is a method in which the substrate is first broken into strips by a machine, and then this strip is again run through the break machine to divide it into resistors each chip to obtain a chip resistor. In addition, the break machine used here includes a mechanism in which a large diameter rubber roller and a small diameter rubber roller are joined, and a substrate or a strip is inserted and held in this joint part, and the slit part is pressed by the pressure of both rubber rollers. It's starting to break out.

(c) Problems to be solved by the invention In recent years, various types of chip resistors have been manufactured and sold on the market, ranging from relatively large ones to those with a length of
They exist up to several millimeters in size. It would be very convenient if these various sizes could be broken using the same breaking machine, but if a small resistor is broken using a machine that breaks relatively large resistors, the conventional manufacturing method described above would not be able to completely break the resistors. However, there is a drawback that a plurality of defective chips are produced in a state where the chips are stuck together, so-called "average defects" occur. This abnormality occurs especially at the last slit that breaks.

In view of the above, it is an object of the present invention to provide a manufacturing method that reduces the occurrence of average failures during breaks.

(d) Means and operation for solving the problem This invention provides slits in a matrix on one substrate, and the slits in these matrix A resistor including an electrode and a resistor is formed in each region surrounded by the slits of the matrix, and the matrix of the deep slit is at least the last one to break. The last two rows of strips or two chips are also broken smoothly because the final slits are deep.

(e) Examples The present invention will be explained in more detail below using examples.

FIG. 1 is a perspective view of an alumina substrate before breaking used in the practice of this invention. In the figure, slits 2a are arranged in a matrix on an alumina substrate 1.
2b,..., 2n and 3a, 3b,..., 3n are provided. These row direction slits 2a, 2
b,..., 2n and column direction slits 3a, 3b,
..., 3n are the slits 2 provided at the ends, that is, the first slits 2 from the end surface of the alumina substrate 1.
slits a, 2n, 3a, and 3n are formed to a greater depth than the other slits. For example, if the thickness of the alumina substrate 1 is 500μ, the slits 2a, 2n
is 250μ, other row direction slits 2b etc.
220μ, 110μ for the slits 3a and 3n, and about 90μ for the other slits 3b in the column direction.

A resistor 7 including electrodes 5, 5 and a resistor 6 is formed in each grid 4 surrounded by slits 2a, 2b, . . . , 2n and 3a, 3b, . Note that the electrode 5 of the resistor 7,
5 are formed in the column direction.

Each resistor 7 formed on the alumina substrate 1
, to obtain the chip resistor, the second
A break machine 10 as shown in the figure is used. The break machine 10 is equipped with a large-diameter rubber roller 11 and a small-diameter rubber roller 12, and has an alumina substrate 1.
in the direction of arrow A, and move the rubber rollers 11 and 1
When the alumina substrate 1 is held between the rubber rollers 11 and 1, the pressure of the rubber rollers 11 and 12 causes the alumina substrate 1 to be held between the rubber rollers 11 and 1.
When passing through 2, it is broken at every slit,
A strip or chip resistor is obtained.

Since the slits in the row direction of the alumina substrate 1 are made deeper than the slits in the column direction, the slits 2a, 2b, ..., 2n in the row direction are broken first, and the alumina substrate 1 is is applied to break machine 10. Row direction slit 2
Since the slits a and 2n are deeper than the other row-direction slits 2b, etc., they may be broken from either the slit 2a side or the slit 2n side. For example, if you proceed from the slit 2n side, it will first be easily broken at slit 2n, and then,
The signal is sequentially broken at each slit, and finally at slit 2a. Since the slit 2a is deep, even if there are only two strips in the end, they are completely broken and the two strips are separated, so no abnormality occurs. Note that when breaking the slits 2a, 2b, ..., 2n in the row direction, the slits 3a, 3b, ..., 3n in the column direction break the slits 2a, 2n, as described above.
Since these slits 3 are shallower than b,...,2n,
a, 3b, . . . , 3n are never broken first.

As described above, when a strip is obtained by breaking row by row, each strip is passed through the break machine 10 to form slits 3a in the column direction,
3b, . . . , 3n are broken to obtain individual chip resistors. The slits 3a and 3n are deeper than the slits 3b, etc. in the other column directions, so no matter which direction the break machine 10 is applied to, the last slit will be a deep slit, so a complete break can be achieved. I can do it.

In the above embodiment, the slits provided in the alumina substrate 1 are made deep at the first slit at both ends of the matrix, but only the first slit at one end of the matrix is deepened, and the slits in the matrix are made deep. You may set the direction and apply it to the break machine so that it breaks last.

(F) Effects of the Invention According to the present invention, the first slit from the end of the slits in the matrix provided on the substrate is made deeper than the other slits, and at least the deep slit portion forms the last slit. Because it breaks, even if there are two or two remaining strips or chips, it can be completely broken and no abnormality will occur.
Chip resistors can be manufactured with high yield.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an alumina substrate before breaking used in the practice of the present invention, and FIG. 2 is a sectional view for explaining the case where the alumina substrate is broken with a breaking machine. 1: Alumina substrate, 2a, 2b,..., 2n・3
a, 3b,..., 3n: slit, 5: electrode, 6:
Resistor, 7: Resistor.

Claims (1)

[Claims] 1. Slits are provided in rows and columns on one substrate, and the slits in these rows and columns are such that the first row from the edge of the board is deeper than the other rows. forming a resistor including an electrode and a resistor in each area surrounded by the slits, and breaking the substrate slit by slit so that the deep slit matrix is at least the last;
A method for manufacturing a chip resistor in which a plurality of chip resistors are obtained. 2. The method of manufacturing a chip resistor according to claim 1, wherein the slits formed deeper than the others are in the first matrix from both ends of the substrate. 3. The slits formed deeper than the others are formed deeper in the row or column, whichever is broken first, than the one broken later. 2. A method for manufacturing a chip resistor according to item 2.