JPH0749762Y2 - Resistor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention mainly relates to a resistor used for a resistance chip component of an electronic circuit or the like.

[Prior Art] For example, Japanese Utility Model Laid-Open No. 59-83004 discloses a resistor for performing trimming for adjusting a resistance value in a direction orthogonal to the energizing direction and in the same direction as the energizing direction. That is, the resistance value is roughly adjusted by trimming in the direction orthogonal to the current-carrying direction, and the resistance value is finely adjusted by performing trimming in the same direction as the current-carrying direction.

[Problems to be Solved by the Invention] In the above publication, even when the resistance value is roughly adjusted by trimming in the direction orthogonal to the energization direction, the change in resistance value is small at the beginning of trimming. Therefore, despite the rough adjustment, the trimming length toward the target resistance value becomes long, and the work time spent adjusting the resistance value becomes longer accordingly. Further, if trimming is performed along the energizing direction and fine adjustment is performed, there is a problem that cracks are likely to occur at the end of the trimming.

An object of the present invention is to shorten the working time required for the rough adjustment of the resistance value and to make it difficult for cracks to occur at the end of trimming.

[Means for Solving the Problem] The first feature of the present invention is to make the rate of change of the resistance value with respect to the trimming length larger when the resistance value is roughly adjusted.

As is clear from FIG. 1 in detail, the resistor of the present invention
Reference numeral 10 denotes a coarse adjustment unit 14 in which a trimming 20 for adjusting the resistance value is planned in a direction orthogonal to the current-carrying direction, and a fine adjustment unit 16 in which a trimming 22 is planned in the same direction as the current-carrying direction.
It has and. In the rough adjusting portion 14, the width W1 in the direction orthogonal to the energization direction is set to be smaller than the width W2 of other portions. A second feature of the present invention is that a plurality of spaces 18 extending in a direction orthogonal to the energization direction are formed in the fine adjustment unit 10 in the energization direction so as to be spaced apart from each other, that is, a plurality of spaces.

[Operation] According to the configuration, when the trimming 20 is performed on the coarse adjustment unit 14, the rate of change (increase) in the resistance value with respect to the trimming length becomes steep. Therefore, the trimming length for rough adjustment toward the target resistance value can be short.

On the other hand, at the time of executing the trimming 22 in the fine adjustment unit 16, the end of the trimming 22 can be accommodated in any of the spaces 18. Therefore, the conventional problem that cracks occur at the trimming end is solved.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. The following embodiments are application examples of resistance chip components mounted in electronic circuits such as ICs.

The resistor 10 is shown in plan view in FIG. In FIG. 1, electrodes 12 are provided on the left and right ends of the resistor 10, respectively. In the case of resistor chip parts, the resistor 10
Also, both electrodes 12 are fixed to an insulating substrate (not shown) such as ceramics.

The resistor 10 includes a coarse adjustment unit 14 and a fine adjustment unit between the electrodes 12 along the current-carrying direction (the horizontal direction in the drawing).
It has 16 and. The coarse adjustment unit 14 trims in a direction orthogonal to the energizing direction (hereinafter referred to as "Y direction").
20 is planned, and the fine adjustment unit 16 is planned to have trimming 22 in the same direction as the energization direction (hereinafter referred to as “X direction”). By performing these trimmings 20 and 22 as shown in FIG. 1, the resistance value of the resistor 10 is adjusted.

The width W1 in the Y direction of the rough adjusting portion 14 is formed smaller than the width W2 of the other portion (fine adjusting portion 16). Further, in the fine adjustment unit 16, a plurality of spaces 18 are formed by cutting out the resistor 10 in the shape of a band along the Y direction at regular intervals in the X direction. Therefore, the trimming 22 performed on the fine adjustment unit 16 is formed across some of the spaces 18.

In order to adjust the resistance value of the resistor 10 toward the required target resistance value, first, the Y direction trimming 20 is performed on the rough adjusting unit 14. By this trimming 20, the resistance value is roughly adjusted toward the target value. Next, the fine adjustment unit 16 is continuously trimmed in the X direction after the trimming 20.
Run 22. As a result, the resistance value is finely adjusted, and the target resistance value can be easily obtained.

It should be noted that the end of the trimming 22 performed in the fine adjustment unit 16 is set to fit in any of the spaces 18. As a result, it is possible to avoid a situation in which the resistor 10 is cracked at the end of the trimming 22.

FIG. 2 shows the lengths of the trimmings 20 and 22 with respect to the resistor 10 and the changes in the resistance value associated therewith. This second
As is clear from the figure, in the Y-direction trimming 20, since the width W1 of the rough adjusting portion 14 is small, the rate of change (increase) in the resistance value with respect to the trimming length is more than that in the conventional rough adjustment. growing. Therefore, for example, the length L of the Y-direction trimming 20 for the rough adjustment toward the target resistance value R shown in FIG. 2 can be short.

Since the trimming 22 performed in the fine adjustment unit 16 is formed across the space 18, the change in the resistance value accompanying this is gradual as shown in FIG.

Regarding the size and number of the spaces 18, it becomes a factor that affects the fine adjustment accuracy of the resistance value.
It must be determined according to the target resistance value specifications.

When the resistor 10 is used as a resistance chip component mounted on an electronic circuit such as an IC, the trimmings 20 and 22 are performed with the resistor 10 mounted on the substrate of the electronic circuit.
However, the mounting position of the resistance chip component, especially the mounting angle thereof, is not always constant. Therefore, when trimming the resistor 10, the mounting state is detected as an image by a video camera or the like, and the appropriate position and direction of trimming are determined by processing of a microcomputer or the like based on this image.

In this case, since the resistor 10 of the present embodiment has different widths W1 and W2 of the rough adjusting unit 14 and the fine adjusting unit 16, respectively, the image processing based on the video image is aimed at the corner portion where these widths change. Can be performed. Therefore, the program setting for carrying out this procedure becomes simple.

Although one embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and various embodiments can be considered. For example, the same function can be obtained even if the rough adjusting section 14 is arranged unevenly on either side in the Y direction, that is, on the upper side or the lower side in FIG.

[Advantage of Invention] Since the width in the trimming direction of the coarse adjustment unit is set smaller than the width of other portions, the present invention provides a trimming length when the resistance value is roughly adjusted toward the target value. The change rate of the resistance value becomes larger. Therefore, the trimming length for rough adjustment is short, and the working time required for this rough adjustment, and eventually the working time itself for obtaining the target resistance value, is shortened. Further, since the trimming end for fine adjustment is accommodated in the preformed space, the occurrence of cracks at the trimming end is also prevented.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is a plan view showing a resistor in a state in which trimming for adjusting a resistance value is performed, and FIG. 2 shows a trimming length and a change in resistance value. It is a graph showing a relationship. 10 …… Resistor 14 …… Coarse adjustment part 16 …… Fine adjustment part 20,22 …… Trimming W1 …… Width of coarse adjustment part W2 …… Width of other parts

Claims (1)

[Scope of utility model registration request] 1. A coarse adjustment unit, which is planned to be trimmed for adjusting a resistance value in a direction orthogonal to a current-carrying direction, and a fine adjustment unit, which is planned to be trimmed in the same direction as the current-carrying direction. Spaces that extend in a direction orthogonal to the energization direction are formed in the fine adjustment part in a spaced manner in the energization direction, and the width of the coarse adjustment part in the direction orthogonal to the energization direction is smaller than the width of other parts. The resistor that is set.