JPS6017903A - Method of trimming resistance network - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for trimming a resistor network.

As shown in the figure, the resistor network is constructed by designing a plurality of resistor elements 2 using a thick film on the surface of a substrate 1 such as alumina, and connecting these to a required circuit network using a conductor 8 and an electrode 4 made of thick film. . It is known to trim the resistance value adjustment of a resistor element with a resistor network K or b constructed in this way - for example, by partially cutting a resistor element using a laser trimming device and adjusting the resistance value. That's why.

In the figure, numeral 5 indicates a cut mark due to trimming.

Usually the board 1. One side of the laser light source is moved relatively, a desired point between the resistive elements 2 is set as a starting point P, and the laser is started to be projected from A, and the resistive element 2 is cut from the edge of the resistive element 2. Then b(.

When the required resistance value reaches a sharp point, the projection point at that time is set as the end point E, the projection of the laser is stopped, and the laser is moved again to between the next resistance elements. However, it is difficult to always set one starting point P between the resistive elements due to printing misalignment of the resistive elements due to this more complicated trimming method, driving errors caused by the drive mechanism of the substrate or laser light source, etc. There are cases where point P is set on the surface of resistive element 2 as shown in FIG. If trimming is performed using such a positional laser, the curve between the start point P and the side edge (right side edge in the figure) of the resistance element 2 will remain without being cut. If during this time 711; 2 is shipped as a product with the remaining parts remaining, VW will use it on the user's side, and the flow will be 1. In the center, this remaining part melts and becomes Lt.
cormorant. If this further melting occurs, the resistance value of the resistor element 2 will change by 75 degrees before and after it occurs, and the original resistance value will no longer be maintained.

An object of the present invention is to trim the resistor element rather than cutting the edges of the resistor element.

A method according to an embodiment of the present invention will be explained with reference to FIG. 8 and subsequent figures. Parts given the same reference numerals as IV indicate the same or corresponding parts. FIG. 8 shows the cut marks 5 trimmed by the method of the present invention.

As will be understood from the present invention, each resistive element 2 is cut off from its side edge. As shown in FIG. 4, the adjacent resistor elements 2A must be trimmed so as to form cut marks 5 as shown in FIG.

Taking the position between 2B as the starting point P, start laser projection from 7'11 and cut the resistive element 2A at its side edge.

After stopping the projection of the laser at the end point E, the laser is returned to the starting point pt. In this case, if the book is returned directly to the starting point P, it is not necessarily the case that the book is returned directly to the starting point P. This work is carried out as follows: the laser light source is equipped with a lamp light source that can project light onto the same area as the laser, and the reflected light of this lamp light can also be detected. Use this lamp light to spot the cut marks 5 made by the laser.

As mentioned above, if we find a point on the cut mark δ of the garment, we will use this point P as the starting point for the projection of the next laser.
Start cutting. Finally, the resistive element 2B is trimmed as shown in FIG. In this way, the mutually adjacent resistive elements 2A and 2B are made bare, and one resistive element 2A is first trimmed with the razor, and then opened in succession.The starting point is an arbitrary point on the cut trace made by trimming in step 6). 1, trimming the other adjacent resistance element 2B. When trimming is completed for resistor elements 9A and 2BK, the resistor elements 2 that are adjacent to each other are separated.
Trim in the same way for 0.2 DVr (see the 8th control, etc.).

Here, when trimming the resistive element 2A, as in Fig. 2, even if the starting point P is located on the surface of the resistive element 2 as shown in 7(2), the trimming of the resistive element 2A After the completion of , the laser is projected to a point P on the cut mark δ due to the trimming of -S^ for the next trimming, so the distance between the starting point P and the right edge of the resistor element 1 (Jll edge) is The razor at this time always cuts the resistor element 2B.Since this razor always cuts the resistor element 2B from its left edge, there is no #gJ uncut part of the resistor element 2BK. - become like that.

If the remaining portion of the resistive element 2A between the starting point P and its right edge is cut off, it is inevitable that the resistance value adjusted by trimming will change. 1
- This change is made before it is used by the user - there is no risk of inconveniencing the user. Also, if this resistance value change is within an allowable range, it can be shipped as is and published as a book, or it can be sold as a low-grade product in the resistance guarantee class.

In some cases, the inn may be discarded and handed over to the user.
Just like that, it's a book.

As described in detail above, according to the present invention, it is possible to trim any uncut portion on one resistive element.

[Brief explanation of drawings]

FIG. 1 is a plan view of a resistor network trimmed by the conventional method, FIG. 2 is a partial plan view of the same, FIG. 8 is a plan view of a resistor network trimmed by the method of the present invention, and FIGS. 4 to 6 are FIG. 7 is a partial plan view showing the trimming process according to the invention method of FIG. 81... Board -2A to 2D... Resistance element -5... Cutting trace, P... Starting point -
P'...Next start AL E...End point 13-

Claims (1)

[Claims] First trim one of the two adjacent resistor elements of the resistor network, which is a plurality of resistor elements arranged in parallel on the surface of the substrate, and then trim any arbitrary marks on the cut marks from the above trimming. 1. A method for trimming a resistor network, characterized in that trimming for the other resistor element is performed with a single start 1-.