JPH04114404A - Resistor - Google Patents

Abstract

PURPOSE:To make it possible to have the effect of trimming on the outer circumferential side equal to or higher than the inner circumferential side by a method wherein the resistance film of a low current density trimming part is thickly formed, or a resistance film having a low specific resistance is formed on the resistance path of a resistor having an electrode part on both ends. CONSTITUTION:In a resistor l consisting of an insulated substrate on which a resistor 4, with which electrodes 2 and 3 will be bridged, is formed, a trimming part 4a is provided on the outer circumferential side in the resistance film thickness which is thicker than the inner circumferential side, the current density on the outer circumferential side is made higher, a part 4b, which is trimming-worked in the trimming part, is provided. A resistance film having low specific resistance may be provided on the trimming part instead of differentiating film thickness. By increasing the current density on the trimming part, the effect of trimming can be displayed to the maximum, the effect of trimming can be improved without making the title resistor large in size, and the resistor can be miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a resistor used in a position detection sensor mainly used in automobile equipment and the like.

Conventional technology The conventional technique will be explained with reference to FIGS. 5 and 6.

"Figure 5 is a plan view showing a conventional resistor, and Figure 6 is a cross-sectional view of the same. According to the figure, 1 is the first electrode 2 and the second
This is a resistor made of an insulating substrate on which a resistance path 4 is formed that bridges the electrodes 3, and 5 is a slider that slides on the inner circumferential side of the resistance path 4. Although not shown, this sliding By sliding the child 5, the first. The resistance value between the second electrodes 2 and 3 can be varied.

Problems to be Solved by the Invention However, in the conventional resistor described above, the current density on the outer circumferential side is lower than that on the inner circumferential side, and when the outer circumferential side is trimmed to correct the resistance value, the current density is lower than that on the inner circumferential side. However, there was a problem that the trimming effect was small. Conventionally, countermeasures have been taken such as increasing the trimming area on the outer circumference side, or sliding the slider on the outer circumference and trimming on the inner circumference side. However, both planar structures have the problem of having to be made large in size.

The present invention is intended to solve such conventional problems, and aims to provide a trimming effect equal to or greater than that on the inner circumferential side even when trimming on the outer circumferential side.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention increases the thickness of the resistive film on the trimming side and uses a material with low specific resistance.

Effects As described above, the present invention improves the trimming effect by increasing the current density on the trimming side by increasing the thickness of the resistive film on the trimming side.

Embodiment An embodiment of the resistor of the present invention will be explained with reference to FIGS. 1 and 2. FIG. 1 is a plan view of the resistor, and FIG. 2 is a sectional view thereof. In the description, parts that are the same as those in the prior art will be given the same numbers. In the same figure, 1 is
Resistance path 4 bridging between electrode 2 in FIG. 1 and electrode 3 in FIG.
This is a resistor made of an insulating substrate on which is formed. Reference numeral 4a denotes a trimming portion provided on the outer circumferential side, in which the resistance film thickness is made thicker than that on the inner circumferential side to increase the current density on the outer circumferential side. 4b is a trimmed portion of the trimming portion. FIG. 3 is a plan view of a rectangular resistor according to another embodiment of the present invention, and FIG. 4 is a sectional view thereof. According to the figure, electrodes 7 and 8 are placed on both ends of the resistor 6 made of an insulating substrate.
A rectangular resistance path 9 having a trimmed portion 9a with a thick resistance film is provided, and 9b is a trimmed portion. By configuring as described above, it is possible to improve the trimming effect in the trimming portion 9a and to prevent the shape from becoming large.

In the present invention, the trimming portion is provided with a thick resistance film of the resistance path, but instead of the difference in film thickness, a resistance film with a low specific resistance may be provided in the trimming portion.

Effects of the Invention As is clear from the above embodiments, the present invention maximizes the trimming effect by providing a trimming portion with a thicker resistive coating on the resistance path and increasing the current density in the trimming portion. Since it is possible to improve the trimming effect without enlarging the shape, it has the effect of reducing the size.

[Brief explanation of drawings]

FIG. 1 is a plan view of one embodiment of the resistor of the present invention, and FIG. 2 is a sectional view taken along line A-A' in FIG.
Riminri° 1...Resistor, 4...Resistance path, 4a.
...Trimming part, 2, 3... Electrode. Name of agent: Patent attorney Haruaki Ogata and 2 others -i-9-

Claims (1)

[Claims] 1. A resistor characterized in that a trimmed portion with a low current density is formed in a resistance path of the resistor having electrode portions at both ends by increasing the thickness of the resistive film or using a resistive film having a low specific resistance.