JP2503798Y2 - Variable resistor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a variable resistor mainly used for volume adjustment of a stereo amplifier or the like.

2. Description of the Related Art The prior art will be described with reference to FIG. 4 which is an explanatory view showing the main configuration of the slide type variable resistor. According to the figure, 1 is a resistor having a conductive printing portion 1a, a low resistance printing portion 1b, and a high resistance printing portion 1c on the surface, and 2 is a contact plate on which the conductive portion is printed.
Is a brush slidingly contacting the resistor 1 and the contact plate 2,
Reference numeral 6 is a terminal fixed to the resistor 1 and the contact plate 2, respectively, and is divided between the terminals 4 and 6 according to the position of the brush 3 by applying an input signal between the terminals 4 and 5. It can be taken out as a compressed output signal.

However, in the conventional variable resistor described above, the resistance value abruptly changes at the boundary point B between the low resistance printing portion 1b and the high resistance printing portion 1c, so that the sliding resistance as shown in FIG. There was a problem that a kana output change curve could not be obtained.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention forms a resistor with two parallel resistance paths whose ends are connected in series,
First and second resistance printing units having different resistance values are provided on the one resistance path, and the third resistance printing unit is positioned on the other resistance path so as to be positioned at the boundary with the first and second resistance printing units. It is configured to have a section.

Operation As described above, the present invention has a plurality of resistance paths arranged in parallel and connected in series at the ends, and the resistance printing portions of the resistance paths are staggered. The boundary between the printing section and the high resistance printing section can be provided in multiple stages, and a smooth output change curve can be obtained.

Embodiment An embodiment of the variable resistor of the present invention will be described with reference to FIG. FIG. 1 is an explanatory view for explaining the main configuration of the slide type variable resistor. According to FIG. 1, 1 is formed in a substantially S shape by connecting two resistance paths and conductive paths in series. A conductive print section 2 which is a resistor and is used to generate a main output change in the resistance path A in the central portion, a low resistance print section 3 which is a first resistance print section, and a high resistance print which is a second resistance print section. The portion 4 and the conductive printing portion 5 are provided, and a third resistor is provided continuously above the conductive printing portion 2, parallel to the central printing portion, and at a position overlapping the boundary between the low resistance printing portion 3 and the high resistance printing portion 4. A resistance path B having a resistance printing section 6 as a printing section is provided, a conductive printing section 7 is continuously provided, and a conductive printing section 7a is continuously provided below the conductive printing section 5 in parallel with the central printing section. It is composed. 8,
Reference numerals 9 and 10 denote brushes, which are in sliding contact with the upper, central, and lower printing portions of the resistor 1, and are connected by a connecting plate 11 made of an insulating material.

Next, the operation of the above embodiment will be described.
Applying an input signal in between, depending on the position of the connecting plate 11,
The output signal between the brushes 8 and 9 changes like the output change curve in FIG. 2 when the connecting plate 11 is moved from left to right in FIG. At this time, since the change by the resistance printing unit 6 is applied in series, the inflection points of the output change curve are dispersed into three points, i, b, and c, and a smooth output change curve can be obtained.

FIG. 3 shows another embodiment of the variable resistor according to the present invention. According to the same figure, 20 is a resistor substrate, 21 is an outer peripheral conductive print part 22 formed concentrically at both ends and an inner part. A resistance path formed on the resistor substrate 20 connected to the peripheral conductive printing section 23, which is the first resistance printing section 21b and the second resistance printing section 21b having a higher specific resistance than the resistance printing section 21b. It is formed by a high resistance printing part 21a which is a resistance printing part. Reference numeral 22a denotes an outer peripheral resistance printing portion which is a third resistance printing portion provided on the conductive printing portion 22 on the outer periphery of an angle corresponding to the boundary between the high resistance printing portion 21a and the resistance printing portion 21b, and 24a, 24b, 24 c has a resistance path 21 at one end, a conductive printing portion 22 on the outer circumference, and a conductive printing portion 23 on the inner circumference.
It is an outer terminal that serves as a brush portion that comes into sliding contact with the top. The variable resistor has the outer terminals 24a to 24c as a case (not shown).
Although the resistor 20 is attached to the device and is rotated, the description is omitted.

The variable resistor shown in FIG. 3 can obtain a smooth output change curve like the variable resistor shown in FIG. 1, and since the brush and the outer terminal are integrated, contact parts are reduced and the quality is stabilized. Can be achieved.

Effect of the Invention As described above, the variable resistor of the present invention includes the first resistance printing section and the second resistance printing section on one of the two parallel resistance paths whose ends are connected in series. A variable resistor having a smooth output change curve is provided because it is composed of a resistor provided with a third resistance printing portion on the other resistance path so as to be located at the boundary and a brush that slides on each resistance path. It is possible.

[Brief description of drawings]

FIG. 1 is an explanatory view for explaining the main structure of a slide type variable resistor which is one embodiment of the variable resistor of the present invention, FIG. 2 is the same output change curve diagram, and FIG. 3 is another embodiment. Explanatory drawing explaining the main structure of a certain rotary type variable resistor, FIG. 4 is explanatory drawing explaining the main structure of the conventional slide type variable resistor,
FIG. 5 is a diagram of the same output change curve. 1 ... Resistor, 2 ... Conductive print part, 3 ... Low resistance print part, 4 ... High resistance print part, 5 ... Conductive print part, 6 ... Resistance print part, 8, 9, 10 ... Brush, A, B ... Resistance road.

Claims (3)

(57) [Scope of utility model registration request] 1. A resistance path in which first and second resistance printing sections having different resistance values are continuously provided in the center and a conductive printing section is provided in the rest, and at least one end of the conductive printing section of the resistance path is connected in series. A resistor body which is connected to and is arranged in parallel and which has a third resistance printing portion at a position overlapping the boundary between the first and second resistance printing portions, and a resistor body on each of the resistance paths and the conductive path. A variable resistor composed of a brush that slides on the printing section. 2. A resistance path which is formed in a partially open ring shape by providing a first and a second resistance printing portion having different resistance values continuously in the center and a conductive printing portion in the rest, and at least this resistance path. From the resistance path, which is connected in series to one end of the conductive printing section of the resistance path and is concentrically arranged, and which is provided with a third resistance printing section at a position overlapping the boundary between the first and second resistance printing sections. A variable resistor including a resistor substrate and a brush that makes sliding contact with each of the resistance paths and the conductive printing portion. 3. The variable resistor according to claim 2, wherein an outer terminal is integrated with a brush that is in sliding contact with the resistor substrate, and the output is changed by rotating the resistor substrate.