JPH085526Y2 - Variable resistor - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION This invention relates to a variable resistor in which a resistor and a current collector are extended in parallel on an insulating substrate and a slider is slidably contacted with the resistor and the current collector. Resistor,
In particular, the present invention relates to a variable resistor in which the variable resistance characteristic is corrected by trimming.

[0002]

2. Description of the Related Art A variable resistor is manufactured without adjustment so that a relationship between a moving position of a movable body holding a slider and a resistance value, that is, a variable resistance characteristic having a predetermined value can be obtained with high accuracy. It is relatively difficult to do. For this reason, normally, the variable resistor made is moved its movable body, and the resistance value is measured at each position.If each value deviates from the predetermined value, a part of the resistor is laser-cut. For example, the resistance value is linearly changed with respect to the movement of the movable body by performing a so-called trimming to remove a desired variable resistance characteristic.

As described above, in the variable resistor having a relatively high accuracy, a trimming region is provided in a part of the resistor to adjust the variable resistance characteristic, and the width of the resistor is widened accordingly. Since the movable body is movably held by removing it from the resistor, the overall shape is large.

[0004]

According to the present invention, the trimming area is provided on one side of the resistor, and the insulating material spacer is arranged on the trimming area along the extension direction of the resistor. A movable body is arranged on the spacer.

[0005]

FIG. 1 shows an embodiment of this invention. In this example, the variable resistor as a whole has an arc shape. That is, the arc-shaped opening 12 is formed along the arc in the upper plate of the arc-shaped case 11 having a rectangular cross section perpendicular to the extension direction.
A knob 13 is projected from the opening 12 to the outside, and the resistance value can be changed by moving the knob 13 along the extension direction of the opening 12.
The insulating substrate 14 is extended from one end of the case 11 in the extension direction, and the terminals 15, 16 and 17 are formed on the protruding insulating substrate 14.

The cross section of the case 11 at right angles to the extending direction is shown in FIG.
As shown in A and B, the case 11 is a square, and the case 11 has a cover 18 having a U-shaped cross section and the bottom plate 1 for closing the open surface, that is, the bottom surface.
It is composed of 9 and 9. Both the cover 18 and the bottom plate 19 are made of a metal material. The insulating substrate 14 is disposed on the inner surface of the bottom plate 19. As shown in FIG. 3, a resistor 21 and a current collector 22 extending in the extension direction are formed on the insulating substrate 14. In this example, the current collector 22 is also made of the same material as the resistor 21. One end of the resistor 21 is connected to the terminal 15, the other end is connected to the terminal 16 through the wiring 23, and one end of the current collector 22 is connected to the terminal 17.

As shown in FIG. 2, a movable body 24 made of an insulating material is provided in the case 11 so as to be movable in its extension direction, and the slider 2 is provided on the surface of the movable body 24 facing the insulating substrate 14.
5, the slider 25 is in sliding contact with the resistor 21 and the current collector 22. Knob 1 integrally with the movable body 24
3 are formed. In this invention, as shown in FIG. 3, a trimming region 21a is integrally formed on one side of the resistor 21, that is, on the opposite side of the current collector 22. The trimming area 21a is removed from the area where the slider 24 is in sliding contact. The trimming area 21a is partially removed, that is, trimmed to adjust the resistance change characteristic between the terminals 15 and 17 with respect to the movement of the movable body 24 to be a predetermined characteristic.

An insulating material spacer 26 is arranged on the trimming area 21a as shown in FIG.
The movable body 24 is arranged on the upper surface 6. In this example, the spacer 26
In parallel with the above, a spacer 27 is arranged on the opposite side of the current collector 22 from the resistor 21, and both ends of the spacers 26 and 27 are integrally connected to form an arc-shaped frame as shown in FIG.
It is composed of a molded product of BS resin. As shown in FIGS. 2 and 4, the second spacer portions 28 and 29 are integrally formed on the outer sides of the spacers 26 and 27 so as to be shifted toward the bottom plate 19 side, and the insulating substrate 14 is interposed between the second spacer portions 28 and 29. And the bottom surfaces of the second spacer portions 28 and 29 are brought into contact with the bottom plate 19, respectively.
The open end surface of the cover 18 is in contact with the upper surface of each.
A plurality of claws 31 integrally projected on the open end surface of the cover 18.
However, each notch 3 of the second spacer portions 28, 29 and the bottom plate 19
After being projected below the bottom plate 19 through 2, 33, 34, the cover 18 is caulked to the outer surface of the bottom plate 19,
The bottom plate 19 is mechanically integrated.

At this time, both sides of the movable body 24 are covered by the cover 1.
8 is loosely sandwiched between the upper plate and the spacers 26, 27,
The movable body 24 is slid on the spacers 26, 27 while pushing the movable body 24 toward the spacers 26, 27 by the knob 13. The upper plate of the cover 18 of the movable body 24, the spacers 26, 2
In order to reduce friction with the movable body 24, protrusions are integrally formed on the movable body 24, and these protrusions are brought into sliding contact with the upper plate and the spacers 26 and 27.

The bottom plate 19 may be omitted, and the insulating substrate 14 may be used as the bottom plate. When using the bottom plate 19, the insulating substrate 14
The effect of electromagnetic shielding is also obtained while reinforcing. In the above description, the invention is made by sliding the mover on an arc, but the invention can also be applied to a variable resistor which is linearly slid.

[0011]

As described above, according to the present invention, since the spacer 26 is arranged on the trimming area and the movable body slides on the spacer, it is possible to move outside the trimming area. It can be made smaller than when the body is slid against the insulating substrate 14. If the movable body is brought into direct contact with and slid on the trimming area, the adjusted variable resistance characteristic may change, but this is not the case in the present invention. In the case of a circular arc slide, the linearity of the variable resistance characteristic is worse than in the case of a straight slide, so this invention is effective.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

2A is a sectional view taken along the line AA of FIG. 1, B is a sectional view taken along the line BB of FIG. 1, and C is an enlarged sectional view of a main part.

FIG. 3 is a plan view showing an insulating substrate 14 of FIG.

FIG. 4 is a plan view showing a state where spacers 26 and 27 are frame bodies.

Claims (1)

[Scope of utility model registration request] 1. A movable body, in which a resistor and a current collector are extended and formed in parallel on an insulating substrate, and a movable body holding a slider in sliding contact with the resistor and the current collector is the insulating substrate and the cover. In the variable resistor movably held in the extension direction of the resistor, a trimming region for correcting the resistance change characteristic with respect to the movement of the movable body is provided on one side of the resistor. A variable resistor, wherein a spacer is arranged on the trimming area along the extension direction of the resistor, and the movable body is arranged on the spacer.