Variable electronic parts

Abstract

To regulate the largest rotational angle of the rotor of a chip type variable resistor while securing its high reliability. A rotor 5 comprises a cup-form body 6 and a ring-form body 7 which are coupled to each other in a body via a hinge portion 8, and is attached to the top surface of an insulating substrate 1 in a rotatable way by its caulking. While a movable stopper portion 15 is protruded downward from a flange 7 of the cup-form body 6, there is formed in the insulating substrate 1 such an opening groove 16 opened upward as to allow the pivoting of the movable stopper portion 15. Both end portions 16a of the opening groove 16 opened upward are withdrawn partially from the outer peripheral surface of the insulating substrate 1 to its inside.

Description

Technical field [0001] The present invention relates to a variable electronic component capable of adjusting electrical characteristics such as resistance value, and is particularly suitable for chip-type variable resistors. Background technique [0002] Chip-type variable resistors (chip-type semi-fixed resistors) generally include: a ceramic insulating substrate with a center hole penetrating through the top and bottom, a metal plate terminal plate with a center axis inserted into the center hole from below, and the center A rotor made of a metal plate that rotates on a shaft and is arranged on an insulating substrate. [0003] The rotor has two overlapping methods and three overlapping methods. The two overlapping rotors are arranged by a cup-shaped body with an opening with a flange facing the upper end facing upward, and the cup-shaped body is arranged on the lower side of the flange. A ring-shaped body (lower panel) is formed, and the flange of the cup-shaped body and the r...

AI Technical Summary

Problems solved by technology

[0007] However, after this chip type variable resistor is soldered on a printed circuit board, the resistance value is adjusted. However, regarding the configuration of JP-A-11-16709 and JP-A-3440884, when the rotor is largely rotated And when the protruding part of the rotor collides with the stopper on the fixed side of the terminal board, the soldering of the terminal board may come off or partially come off due to the impact.

[0008] In addition, in the configurations of JP-A-11-16709 and JP-A-3440884, the stopper portion on the fixed side of the terminal board and the protruding portion of the rotor may be deformed during the adjustment of the resistance value many times, which may result in failure. function as a brake

[0009] On the other hand, Japanese Patent Laid-Open No. 2000-340410 makes the opening edge of the center hole of the insulating substrate form a fixed-side stopper, but because the outer diameter of the cup-shaped body is larger than the inner diameter of the center hole, the rotation of the cup-shaped body (rotor) has A large moment acts on the tongue, so when the tongue collides with the stopper on the fixed side, the tongue deforms under the action of the elastic force, and the tongue of the cup-shaped body does not rub against the segment of the insulating substrate to generate dust (the powder of the substrate) ), these dusts enter the riveting part and reduce the fixing strength, and may cause adverse effects on the circuit if it falls from the center hole to the circuit board

[0010] Furthermore, in the configuration of JP-A-2000-340410, the inner peripheral edge of the cup-shaped body is formed into a single crimp shape by the riveted part of the central axis, so the holding strength of the rotor is weakened, and when the resistance value is adjusted many times, the attitude of the rotor Loss of holding power, thus losing its effect

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