Variable pellet resistor

Abstract

To provide a chip variable resistor equipped with a joint which is improved in strength and a rotating body which is normally rotated. This chip variable resistor is equipped with a U-shaped joint 8, a base 9 and a top plate 6 which overlap with each other, and the groove 7a of a driver groove 7 which is located off a line S drawn between the center C of the top plate 6 and the center of the width A of the joint 8. Therefore, the center of the joint 8 is joined to the top plate 6 with a broad part 6b, so that the joint is improved in strength and hardly twisted or bent when the rotating body 5 is rotated by a driver, the base 9 is precisely rotated, and a slider 9a is kept free from troubles.

Description

technical field [0001] The present invention relates to chip varistors used in various electronic devices and the like. Background technique [0002] Conventional chip varistors, such as those disclosed in Japanese Patent Application Laid-Open No. Heisei 7-38327, can be described with reference to FIGS. 8 to 12 . On the surface of an insulating substrate 51 made of ceramics or the like, an arc-shaped resistor body 52 is provided centering on a hole (not shown in the figure) provided at the center, and at the same time, an arc-shaped resistor body 52 is provided at The electrode portion 53 as a terminal. [0003] The rotating body 54 made of sheet metal has: an upper panel 55, a disk-shaped expansion part 56 that expands the center of the upper panel 55 downward, and is connected to the upper panel 55 by a connecting part 57. The slide piece 58 bent in a U shape and located below, and the cross-shaped screwdriver groove 59 straddling the upper panel 55 and the expansion par...

AI Technical Summary

Problems solved by technology

[0008] And, since the groove portion 59a of the screw groove 59 is located on the line S connecting the center C of the upper panel 55 and the center portion of the lateral width A of the connecting portion 57, the upper panel 55 and the sliding piece 59 are connected. The central portion of the portion 57 becomes thinner, and its strength decreases. Therefore, when the rotating body 54 is rotated with a screwdriver, the connecting portion 57 will be twisted and bent, which will affect the normal rotation of the sliding piece 58.

[0009] In the conventional chip varistor, since the groove portion 59a of the screwdriver groove 59 is located on the line S connecting the center c of the upper panel 55 and the center portion of the lateral width A of the connecting portion 57, the upper panel 55 and The central portion of the connecting portion 57 where the sliding piece 59 is connected is thinner, and its strength is reduced. Therefore, when the rotating body 54 is rotated with a screwdriver, the connecting portion 57 will be twisted and bent, which will affect the normal rotation of the sliding piece 58.

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