JPH05109509A - Slide type variable resistor - Google Patents

Abstract

PURPOSE:To provide a sliding type variable resistor which is capable of resolving such problems which increase production cost resultant from grinding work of a resistor board to enhance sliding touch and extend production lead time in a sliding type variable resistor used for various kinds of home electronic equipment. CONSTITUTION:When punching a resistor board 21 which has received no grinding work yet, this sliding type variable resistor consists of the cornered portions of two parallel and flat terminal sections 27 and 28 at the top and bottom and a slider 26 having contact portions 31 and 32 which are adjacent and opposed to the cornered sections in the shape of truncated cheuron. This construction makes it possible to provide a sliding type variable resistor which reduces production lead time at low cost and enhances sliding touch.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide type variable resistor mainly used in consumer electronic equipment such as a cassette tape recorder with a radio, a television receiver and a telephone.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to a slide type variable resistor shown in FIGS. In the figure, reference numeral 1 denotes a resistance substrate obtained by punching a phenol resin laminated plate or the like into a rectangular shape. A linear resistance layer 2 and a conductor layer 3 are printed in parallel along the longitudinal direction of the surface of each resistance layer. External connection terminals 4, 4'and 5, 5 ', which also serve as mounting legs, are fixedly attached to the ends of the terminals.

Reference numeral 6 denotes a slider made of a molding resin having elasticity, which is parallel to the upper and lower ends 7 and 8 of the resistance substrate 1.
Arm part 9 and elastic leg 1 for elastically sandwiching and clamping
0, and connecting portions 11 and 12 and an operating lever portion 13 that connect between them, and are engaged with the resistance substrate 1 so as to be slidable in the longitudinal direction.

Here, the portion where the arm portion 9 and the elastic leg 10 of the slider 6 contact the upper and lower parallel ends 7 and 8 of the resistance substrate 1 are in line contact with the end face of the substrate as shown in FIG. , Is a straight line parallel to the end face of the substrate.

Reference numeral 14 is a slider upper and lower connecting portion 11
With a sliding contact made of a thin metal plate held inside, the slider 6 slides linearly with the slider 6 while elastically short-circuiting between the resistor layer 2 and the conductor layer 3 on the resistor substrate 1. It goes.

The conventional slide type variable resistor is constructed as described above, and by applying a pushing force to the operation lever portion 13 of the slider 6, the sliding contactor 14 held by the slider 6 is resistance. By sliding on the printed layers 2 and 3 of the substrate 1, the resistance value between the connecting terminals 4 and 4'of the resistor layer 2 and the connecting terminals 5 and 5'of the conductor layer 3 is changed.

[0007]

However, in the above conventional slide type variable resistor, when the operation lever portion 13 of the slider 6 is operated by pushing with a finger, the contact between the slider 6 on the movable side and the resistance substrate 1 on the fixed side is made. As parts, the arm portion 9 and the elastic leg 10 of the slider 6 for elastically sandwiching the upper and lower parallel ends 7 and 8 of the resistance substrate 1, the printed layer 2 of the resistance substrate 1,
While making contact with the contact portion of the sliding contactor 14 that makes elastic contact with the contact point 3 and the upper and lower ends 12 'of the upper and lower connecting portions 12 of the slider 6 that receives the reaction force of the sliding contactor 14 on the rear surface side of the resistance substrate 1. The slider 6 slides linearly.

At this time, the front and back surfaces of the resistance substrate 1 with which the contact points of the sliding contactor 14 and the upper and lower ends 12 'of the connecting portions are in contact are smooth because they slide smoothly. The upper and lower parallel ends 7 and 8 of the resistance substrate 1 with which the arm portion 9 and the elastic legs 10 are in contact have a rough surface because they are cut portions when the resistance substrate 1 is punched, and the upper portion of the resistance portion 1 and the elastic portion 10 are elastic. When the legs 10 make a line contact and slide, the legs 10 become rugged.

Therefore, the uncomfortable sliding feeling of the contact portions of the upper and lower parallel ends 7 and 8 is transmitted to the finger of the hand pushing the operation lever portion 13, and the commercial value of the slide type variable resistor is lowered. Will be

As a measure against this, generally, after the resistance substrate 1 is punched, the upper and lower parallel ends 7 and 8 in the longitudinal direction are purposely prepared.
Is polished and further smoothed by cleaning to remove polishing powder, which increases the cost of the resistance substrate 1, and immediately after punching the resistance substrate 1, slide type variable resistance There is a problem that the production lead time becomes long because it cannot be assembled as a container.

The present invention solves such a conventional problem, and provides a slide type variable resistor which does not cause discomfort during a sliding operation even if the resistance substrate is used as it is without polishing after being punched. It is intended to be provided.

[0012]

According to the present invention, attention is paid to the fact that the portions 15 and 16 near the front and back surfaces of the thickness of the resistance substrate are smooth, and the arm portion of the slider and the elastic leg are in point contact with the corner portion. It is what makes them.

[0013]

Therefore, according to the present invention, since the smooth surface of the corner portion of the resistance substrate is brought into sliding contact with the arm portion and the elastic leg of the slider, the polishing process and the cleaning process after the punching process of the resistance substrate are eliminated. Also, it is possible to realize a slide-type variable resistor that causes less discomfort felt by a finger during a slide operation.

[0014]

EXAMPLE FIG. 8 is a partially enlarged perspective view of a resistance substrate. Since punching is performed, the corner portions 15 and 16 near the front and back surfaces of the plate thickness are cut by the cutting blade portion of the punching die. Therefore, the intermediate part 17 is rough because it becomes a fractured part and has many irregularities. The present invention focuses on the corners of the parallel ends among the above corners.

An embodiment of the slide type variable resistor of the present invention will be described with reference to FIGS. In the figure, reference numeral 21 is a resistance substrate similar to the conventional example, and along the surface longitudinal direction,
The linear resistor layer 22 and the conductor layer 23 are formed by printing, and the external connection terminals 24, 24 'and 25, 25' are attached to the ends of the respective printed layers as in the conventional example. is there.

However, the end faces of the upper and lower parallel ends 27 and 28 of the resistance substrate 21 are punched and not polished.

The shapes of the arm portion 29 of the molded resin slider 26 and the contact portions 31 and 32 of the elastic leg 30, which elastically sandwich the parallel ends 27 and 28 from above and below, are shown in enlarged form in FIG. Has a V shape facing each other, and the left and right taper portions 31A,
31B and 32A, 32B, smooth upper and lower parallel edges 27, 28 of the resistance substrate 21 and the corner 2 of the back surface.
7A, 27B and 28A, 28B are in point contact.

Further, sliding contacts 34 are attached to the upper and lower arms of the slider 26 and the connecting portion 33 of the elastic legs 29 and 30.
Is held and the slider 26 is linearly slid by applying a pressing force to the operation lever portion 35,
Changing the resistance value between the connecting terminals 24 and 24 'and the connecting terminals 25 and 25' of the conductor layer 23 is also similar to the conventional example.

In the slide type variable resistor having such a structure, when the operation lever portion 35 of the slider 26 is operated by pushing with a finger, the contact portion between the slider 26 which is a movable portion and the resistance substrate 21 which is a fixed portion is Since all of them are smooth parts, no discomfort is transmitted to the fingers of the operating hand.

The arm portion 29 and the elastic leg 30 of the slider 26 that holds the parallel ends 27 and 28 of the resistance substrate 21 therebetween.
C-shaped tapered portion 31 of the contact portions 31 and 32 of
Although A, 31B and 32A, 32B are shown as straight lines in the above example, it is needless to say that they may be arcuate as shown in FIG.

Further, in order to simplify the structure of the die for forming the slider 26, the left and right taper portions 31A, 31B and 32A, 32B of the arm portions and the contact portions 31 and 32 of the elastic legs, respectively. As shown in FIG. 5, the left and right tapered portions 36A, 36B or 37A viewed from the side are not opposed to each other,
It suffices that 37B faces each other.

[0022]

As is apparent from the above-described embodiment, the present invention can reduce steps such as polishing and cleaning for smoothing the end face after punching the resistance substrate of the slide type variable resistor. Therefore, the product cost can be greatly reduced, and the production lead time can be shortened.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of a slide type variable resistor of the present invention.

FIG. 2 is a side sectional view taken along line BB ′ of FIG.

FIG. 3 is an enlarged view of a main part for explaining an engagement state between the resistance substrate and the slider.

FIG. 4 is an enlarged view of a main part for explaining an engagement state between a resistance substrate and a slider according to another embodiment.

FIG. 5A is an enlarged view of a main part of an arm portion of a slider according to another embodiment. FIG. 5B is an enlarged view of a main part of an elastic leg of a slider according to another embodiment.

FIG. 6 is a front view of a conventional slide type variable resistor.

7 is a side sectional view taken along the line AA ′ in FIG.

FIG. 8 is an enlarged view of a punched end surface of the resistance substrate.

[Explanation of symbols]

 21 Resistance Substrate 22 Resistor Layer 23 Conductor Layer 26 Slider 27, 28 Parallel End 29 Arm Part 30 Elastic Leg 31, 32 Contact Part 34 Sliding Contact

Claims (2)

[Claims] 1. A resistor substrate, which is obtained by punching a rectangular laminate of a phenol resin laminated plate or the like in which a resistor layer and a conductor layer are formed by printing in parallel and external connection terminals are attached to the ends of each printed layer. A contact part provided on an arm and an elastic leg that elastically clamps the smooth front and back corners of the board in parallel with each other in the vertical direction, and a connecting part between the arm and the elastic leg and an operating lever part. A slider that is slidably engaged with the resistance substrate in the longitudinal direction, and a resistor layer and a conductor layer on the resistance substrate that are held by the connecting portion of the slider and that accompany the linear movement of the slider. A slide type variable resistor consisting of a sliding contactor that slides while short-circuiting. 2. The variable slide type according to claim 1, wherein the left and right tapered portions of the C-shaped portion on the contact portion of the slider that holds the vertically parallel end corners of the resistance substrate do not face each other. Resistor.