CN211907125U - Low-delay carbon diaphragm for potentiometer - Google Patents

Abstract

The utility model provides a low delay carbon diaphragm for a potentiometer, which comprises an insulating substrate, wherein the front surface of the insulating substrate is provided with a circular ring-shaped inner slide rail copper layer, and the outer part of the inner slide rail copper layer is provided with a circular arc-shaped outer slide rail copper layer; the outer sliding rail copper layer comprises n first copper belt layers which are arranged at equal intervals, and a second copper belt layer is arranged between two first copper belt layers at two ends; the reverse side of insulating substrate is equipped with n impedance unit, and the impedance unit includes two miniature copper seat and a carbon film resistance area, and two miniature copper seat are connected in the both ends of carbon film resistance area, are connected with the conductive copper line layer between two the closest miniature copper seat in two adjacent impedance unit, and two miniature copper seats in the same impedance unit are connected with the both ends on first copper tape layer through two conduction layers. The utility model discloses during the application, carbon film resistance area can not worn and torn by the brush, and long service life can effectively avoid the potential control hysteresis to appear, and the potential control effect is sensitive.

Description

Low-delay carbon diaphragm for potentiometer

Technical Field

The utility model relates to a carbon diaphragm specifically discloses a low carbon diaphragm that delays for potentiometre.

Background

The potentiometer is a resistance element with three leading-out terminals and the resistance value can be regulated according to a certain change rule, and is usually composed of a resistor body and a movable electric brush, the resistor body is generally a carbon diaphragm, the carbon diaphragm used for the potentiometer is also called a carbon film circuit board, when the electric brush moves along the resistor body, the resistance value or voltage which has a certain relation with the displacement is obtained at the output terminal.

The carbon membrane mainly comprises an insulating substrate, a carbon membrane and a welding end, wherein a continuous carbon membrane is arranged on the surface of the insulating substrate to form a potential regulation base, and the carbon membrane is connected with a circuit of a potentiometer through the welding end. In the prior art, an electric brush in a potentiometer realizes potential adjustment by sliding on a carbon film, after the potentiometer is used for a period of time, the carbon film on the carbon film can be seriously abraded, so that the performance of the potentiometer is reduced, even the potentiometer is scrapped, the service life is short, the resistance output characteristic curve of the carbon film in the prior art is shown in figure 1, and when the carbon film in the prior art is matched to realize potential adjustment, the resistance value rises slowly after a unit stroke, so that larger hysteresis exists, and the adjustment is insensitive.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a low-delay carbon membrane for a potentiometer, which can effectively prevent the carbon membrane from being worn, has a long service life, and forms a sensitive potential adjustment effect, in view of the problems in the prior art.

In order to solve the prior art problem, the utility model discloses a low-delay carbon diaphragm for a potentiometer, which comprises an insulating substrate, wherein the front surface or the back surface of the insulating substrate is provided with a first welding end, a second welding end and a third welding end;

the outer slide rail copper layer comprises n first copper belt layers which are arranged at equal intervals, n is an integer larger than 2, a second copper belt layer is arranged between the two first copper belt layers at the two ends, an interval is arranged between the second copper belt layer and the two first copper belt layers at the two ends, and one ends, close to the second copper belt layer, of the two first copper belt layers at the two ends are respectively connected with a second welding end and a third welding end;

the reverse side of insulating substrate is equipped with n impedance unit, and the impedance unit includes two miniature copper seat and a carbon film resistance area, and two miniature copper seats in same impedance unit are connected in the both ends of carbon film resistance area, are connected with the conductive copper line layer between two the miniature copper seats that are closest in two adjacent impedance units, and two miniature copper seats in same impedance unit are connected with the both ends on first copper tape layer through two conduction layers, and the conduction layer is located insulating substrate.

Further, the surfaces of the inner slide rail copper layer, the outer slide rail copper layer, the second copper belt layer, the micro copper seat and the conductive copper wire layer are all provided with copper deposition layers.

Further, the thickness of the copper deposition layer is at least 2 μm.

Furthermore, the interval between two adjacent first copper strip layers is D, D is more than or equal to 0.05mm and less than or equal to 0.15mm, the distance between the second copper strip layer and the two first copper strip layers at two ends is P, and P is D.

Further, the distance between two closest micro copper seats in two adjacent impedance units is Q, and Q is D.

Furthermore, the thickness of the first copper tape layer and the thickness of the second copper tape layer are both 10-20 μm.

Furthermore, the areas of the first copper tape layer and the second copper tape layer are both S, the area of the micro copper seat is A, and A is not less than 0.1S and not more than 0.25S.

Furthermore, the resistance value of the carbon film resistance tape is 100 omega-1M omega.

The utility model has the advantages that: the utility model discloses a low carbon film that postpones for potentiometre switches on to the insulating substrate opposite side through special structure in the carbon film resistance area that will be located insulating substrate one side, and during the application, the carbon film resistance area can not worn and torn by the brush, long service life, and the structure is reliable, and in addition, copper strips layer and carbon film resistance area are the discontinuous structure of multistage, can effectively avoid the potential control hysteresis to appear, and the potential control effect is sensitive.

Drawings

Fig. 1 is a graph of the resistance output characteristics of a prior art carbon membrane.

Fig. 2 is a schematic structural view of the front side of the present invention.

Fig. 3 is a schematic view of the reverse structure of the present invention.

Fig. 4 is a schematic cross-sectional view along B-B' in fig. 2.

Fig. 5 is a graph of the resistance output characteristic of the present invention.

The reference signs are: the micro copper pad comprises an insulating substrate 10, a first welding terminal 11, a second welding terminal 12, a third welding terminal 13, a conducting layer 14, a copper deposition layer 15, an inner slide rail copper layer 20, an outer slide rail copper layer 30, a first copper tape layer 31, a second copper tape layer 32, a resistance unit 40, a micro copper pad 41, a carbon film resistance tape 42 and a conductive copper wire layer 43.

Detailed Description

For further understanding of the features and technical means of the present invention, as well as the specific objects and functions attained by the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description.

Refer to fig. 2 to 5.

The embodiment of the utility model discloses a low carbon diaphragm that delays for potentiometre, as shown in fig. 2-4, including insulating substrate 10, preferably, insulating substrate 10 is epoxy board or RF4 board, insulating substrate 10's front or reverse side is equipped with first welded end 11, second welded end 12 and third welded end 13, show in fig. 2 that first welded end 11, second welded end 12 and third welded end 13 locate insulating substrate 10's front, insulating substrate 10's front is equipped with annular interior slide rail copper layer 20, interior slide rail copper layer 20 is equipped with circular-arc outer slide rail copper layer 30 outward, preferably, the circular arc central angle that outer slide rail copper layer 30 formed is greater than 180, first welded end 11 is through copper line and interior slide rail copper layer 20 conductive connection;

the outer slide rail copper layer 30 comprises n first copper strip layers 31 which are arranged at equal intervals, the first copper strip layers 31 are in a short arc shape, n is an integer larger than 2, a second copper strip layer 32 in a short arc shape is arranged between the two first copper strip layers 31 at the first end and the last end of the outer slide rail copper layer 30, namely the second copper strip layer 32 is positioned at an arc gap of the outer slide rail copper layer 30, the second copper strip layer 32 and all the first copper strip layers 31 surround to form a non-continuous ring, a gap is arranged between the second copper strip layer 32 and the two first copper strip layers 31 at the two ends, and one ends, close to the second copper strip layer 32, of the two first copper strip layers 31 at the first end and the last end of the outer slide rail copper layer 30 are respectively connected with the second welding end 12 and the third welding end 13 in a conduction mode through copper wires;

the reverse side of the insulating substrate 10 is provided with n impedance units 40, each impedance unit 40 comprises two micro copper bases 41 and a carbon film resistance band 42, the two micro copper bases 41 in the same impedance unit 40 are connected to two ends of the same carbon film resistance band 42, two ends of the carbon film resistance band 42 are covered on the surfaces of the two micro copper bases 41, the length of the carbon film resistance band 42 is larger than the minimum distance between the two adjacent impedance units 40, a conductive copper wire layer 43 is connected between the two closest micro copper bases 41 in the two adjacent impedance units 40, the two micro copper bases 41 in the same impedance unit 40 are respectively connected with two ends of the same first copper tape layer 31 through two conducting layers 14, namely the micro copper bases 41 are connected with one end of the first copper tape layer 31 through the conducting layer 14, the other micro copper bases 41 in the same impedance unit 40 are connected with the other end of the same first copper tape layer 31 through the other conducting layer 14, the conductive layer 14 is located in the insulating substrate 10 and penetrates through both surfaces thereof.

During the use, be connected to first welding end 11, second welding end 12 and third welding end 13 in the circuit that the potentiometre corresponds, the brush is installed in insulating substrate 10's front and can slide on interior slide rail copper layer 20 and outer slide rail copper layer 30, the brush directly contacts with outer slide rail copper layer 30 to lead the carbon film resistance area 42 through conducting layer 14 and miniature copper seat 41 with electric current, realize the function of resistance regulation and control, carbon film resistance area 42 does not contact with the brush direct, can effectively avoid carbon film resistance area 42 to be damaged by the friction and lead to the performance reduction of potentiometre, even lead to the potentiometre to scrap. The utility model discloses generally be applied to the potentiometre of on-vehicle steering wheel, each copper circuit can be at the front of insulating substrate 10 or reverse side through the metallization jogged joint each welding end that runs through insulating substrate 10.

The utility model discloses well copper strips layer and carbon film resistance area are the discontinuous structure of multistage, the utility model discloses the resistance output characteristic curve of carbon diaphragm is as shown in figure 5, and every behind the unit stroke, the resistance rising trend is fast, and the curve is close perpendicularly, and the hysteresis of potential control is little, and the potential control effect is sensitive.

In the embodiment, the copper deposition layers 15 are disposed on the surfaces of the inner slide rail copper layer 20, the outer slide rail copper layer 30, the second copper tape layer 32, the micro copper seat 41 and the conductive copper wire layer 43, and the conductivity of each copper layer on the two surfaces of the substrate can be effectively improved through the copper deposition layers 15.

Based on the above example, the thickness of the copper deposit layer 15 is at least 2 μm.

In the embodiment, the distance between two adjacent first copper tape layers 31 is D, D is greater than or equal to 0.05mm and less than or equal to 0.15mm, the minimum distance between the second copper tape layer 32 and two first copper tape layers 31 at both ends is P, and P is D.

Based on the above embodiment, the distance between the two closest micro copper pads 41 in the two adjacent impedance units 40 is Q, Q ═ D, and there are three edges in a common line between the micro copper pads 41 and the first copper strip layer 31.

In the present embodiment, the first copper tape layer 31 and the second copper tape layer 32 have a thickness of 10 to 20 μm.

In the embodiment, the areas of the first copper tape layer 31 and the second copper tape layer 32 are both S, the area of the micro copper pad 41 is a, and a is greater than or equal to 0.1S and less than or equal to 0.25S, so as to ensure that a sufficient space is formed between two micro copper pads 41 in the same impedance unit 40 to dispose the carbon film resistor 42.

In the embodiment, the resistance of the carbon film resistor 42 is 100 Ω -1M Ω, and the corresponding resistance can be set according to the application.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (8)

1. The low-delay carbon membrane for the potentiometer is characterized by comprising an insulating substrate (10), wherein a first welding end (11), a second welding end (12) and a third welding end (13) are arranged on the front surface or the back surface of the insulating substrate (10), a circular inner sliding rail copper layer (20) is arranged on the front surface of the insulating substrate (10), an arc-shaped outer sliding rail copper layer (30) is arranged outside the inner sliding rail copper layer (20), and the first welding end (11) is connected with the inner sliding rail copper layer (20);

the outer slide rail copper layer (30) comprises n first copper strip layers (31) which are arranged at equal intervals, n is an integer larger than 2, a second copper strip layer (32) is arranged between the two first copper strip layers (31) at the two ends, an interval is arranged between the second copper strip layer (32) and the two first copper strip layers (31) at the two ends, and one end, close to the second copper strip layer (32), of the two first copper strip layers (31) at the two ends is respectively connected with the second welding end (12) and the third welding end (13);

the reverse side of the insulating substrate (10) is provided with n impedance units (40), each impedance unit (40) comprises two micro copper seats (41) and a carbon film resistance band (42), the two micro copper seats (41) in the same impedance unit (40) are connected to two ends of the carbon film resistance band (42), a conductive copper wire layer (43) is connected between the two closest micro copper seats (41) in the two adjacent impedance units (40), the two micro copper seats (41) in the same impedance unit (40) are connected with two ends of the first copper wire layer (31) through two conducting layers (14), and the conducting layers (14) are located in the insulating substrate (10).

2. A low-delay carbon membrane for a potentiometer according to claim 1, wherein the surfaces of the inner sled copper layer (20), the outer sled copper layer (30), the second copper tape layer (32), the micro copper seat (41) and the conductive copper wire layer (43) are provided with copper deposition layers (15).

3. A low retardation carbon membrane for a potentiometer according to claim 2, wherein the thickness of the copper deposit layer (15) is at least 2 μm.

4. A low retardation carbon membrane for use in potentiometers as defined in claim 1 wherein the spacing between two adjacent first copper strip layers (31) is D, 0.05mm ≤ D ≤ 0.15mm, and the distance between the second copper strip layer (32) and two first copper strip layers (31) at both ends is P, P ═ D.

5. The carbon diaphragm for a potentiometer according to claim 4, wherein the distance between the two closest micro copper seats (41) in two adjacent impedance units (40) is Q, Q ═ D.

6. A low retardation carbon membrane for use in a potentiometer according to claim 1, wherein the thickness of each of the first copper tape layer (31) and the second copper tape layer (32) is 10-20 μm.

7. A low retardation carbon membrane for use in a potentiometer according to claim 1, wherein the areas of the first copper tape layer (31) and the second copper tape layer (32) are both S, the area of the micro copper pad (41) is a, 0.1S ≦ a ≦ 0.25S.

8. A low-delay carbon diaphragm for a potentiometer according to claim 1, wherein the carbon film resistor strip (42) has a resistance value of 100 Ω -1 Μ Ω.

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