A carbon film resistor with adjustable resistance

Abstract

The utility model provides a carbon film resistor convenient for resistance value adjustment belongs to carbon film resistor technical field, including the carbon film resistor disc that can freely tailor and realizes resistance value adjustment, and the tailor carbon film resistor disc forms the N cutouts of equal width, and the cutout is at least one, the utility model to carbon film resistor disc freely tailors and realizes resistance value adjustment through setting the cutout of equal width, and resistance value satisfies R N =(N+1) 2 *R0's calculation relation makes the user not need to replace the resistor of different resistance value, only through the optional lap joint position of the selection tailoring operation obtains to change the resistance value flexibly, greatly satisfies the adjustment demand of resistance value under the circuit debugging and different working condition, simultaneously, the silver paste or copper paste coating of cutout is painted, can effectively eliminate the potential difference, avoids the resistor to appear the overheating phenomenon in the working process, not only has improved the stability and safety of resistor work, still prolonged its service life.

Description

TECHNICAL FIELD

[0001] The utility model relates to carbon film resistor technical field, specifically be a carbon film resistor convenient for adjusting resistance value. BACKGROUND

[0002] In the design and application of electronic circuit, the traditional carbon film resistor is usually set as fixed resistance value, when the circuit debugging or the resistance value needs to be adjusted according to different working conditions, different resistance value resistors often need to be replaced, especially in the process of building some experimental circuits or electric heating demand scenes, with the change of experimental conditions or the demand of adjusting electric heating performance, different resistance value resistors may need to be constantly tried to achieve the best circuit effect. In some miniaturized and integrated electronic equipment, due to limited space, reserving multiple resistance value resistors not only occupies space, but also increases cost. SUMMARY

[0003] The utility model discloses a carbon film resistor convenient for adjusting resistance value to solve the problem of the adaptability of the carbon film resistor with fixed resistance value, which cannot be adjusted according to the demand in use.

[0004] To achieve the above object, the utility model provides the following technical scheme: a carbon film resistor convenient for adjusting resistance value, including the carbon film resistor sheet that can be freely cut and realizes resistance value adjustment, and the carbon film resistor sheet is cut to form N equal-width notches, and the notches are at least one, and N+1 equal-width new carbon film resistor sheets connected in series: N+1 equal-width new carbon film resistor sheets are formed by connecting in series after cutting, and the comprehensive resistance value of the new carbon film resistor sheet is R N =(N+1) 2 *R0, wherein R N is the target value of the resistance to be adjusted, N is the number of notches, and R0 is the original resistance value of the carbon film before cutting; both ends of the carbon film resistor sheet are fixedly connected with the electrode sheet in conduction.

[0005] As a preferred scheme of the utility model, the bottom of each of the N equal-width notches of the carbon film resistor sheet is provided with a coating.

[0006] As a preferred scheme of the utility model, the electrode sheet on the surface of the carbon film resistor sheet is at least two.

[0007] Compared with the prior art, the utility model has the beneficial effects that:

[0008] 1) The utility model freely cuts the carbon film resistor sheet and adjusts the resistance value by setting equal-width notches, and the resistance value meets R N =(N+1) 2The calculation relationship of R0 is that the user does not need to replace resistors with different resistance values, but only needs to select optional lap positions obtained through cutting operation to flexibly change the resistance value, greatly meets the adjustment demand of the resistance value in circuit debugging and different working conditions, is especially suitable for frequent attempts and optimization of the resistance value in experimental circuit building, significantly improves the convenience and flexibility of the resistor use, meanwhile, the silver paste or copper paste coating coated on the cutout can effectively eliminate the potential difference and avoid the overheat phenomenon of the resistor in the working process, not only improves the stability and safety of the resistor working, but also prolongs the service life. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 It is a whole structure schematic view of the utility model;

[0010] Figure 2 It is a cutout structure schematic view of the utility model;

[0011] Figure 3 It is a cutout structure schematic view of the utility model;

[0012] Figure 4 It is a cutout structure schematic view of the utility model.

[0013] In the drawing: 100, carbon film resistor sheet; 110, cutout; 120, coating; 200, electrode sheet. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0015] EMBODIMENT

[0016] Please refer to Figures 1-4 A carbon film resistor convenient to adjust resistance value, including freely cutting and realizing resistance value adjustment's carbon film resistor sheet 100, and cutting carbon film resistor sheet 100 forms N cutouts 110 of equal width, and cutout 110 is at least one, and N+1 equal width's new carbon film resistor sheet of series connection, according to conductor resistance value and material length, cross-sectional area's relationship formula: R=ρL / A, wherein ρ is material resistivity, L is conductor length, A is cross-sectional area can know:

[0017] After cutting, the carbon film resistors are connected in series to form N+1 new carbon film resistors 100 of equal width, and the combined resistance of the new carbon film resistors 100 is: R N (N+1) 2 *R0, where R N The target value of the resistor to be adjusted is given by N, which is the number of cuts, and R0 is the original resistance value of the carbon film before cutting. Both ends of the carbon film resistor 100 are fixedly connected to conductive electrode plates 200.

[0018] Specifically, when circuit debugging requires adjusting the resistance value from the initial value to the target value, the resistance value must satisfy R... N = (N+1) 2 The relationship between *R is achieved by cutting the carbon film resistor 100 to form a cut 110 of equal width.

[0019] For example, in an experimental circuit, if the initial resistance value is R, and it is necessary to adjust the resistance value to 4R, simply cut a slit 110 in the carbon film resistor 100 (e.g., Figure 2 As shown), the resistance becomes 4R, achieving the target resistance value; to obtain a resistance value of 9R, two cuts are made to form two slits (e.g., 110). Figure 3 As shown), forming 9R, and so on, when 3 cuts are made to form 3 slits 110 (as shown). Figure 4 As shown), a 16R resistor can be formed to obtain the corresponding target resistance value. At the same time, the coating 120 applied to the bottom of the cut 110 effectively eliminates the potential difference, avoids the problem of local overheating caused by the potential difference, and ensures that the resistor works stably under different resistance values.

[0020] The electrode plates 200 at both ends of the carbon film resistor 100 serve as conductors. By selecting different positions of the electrode plates 200 on the cut carbon film resistor 100 and connecting the resistor with the adjusted resistance value to the circuit, the circuit can meet the requirements of different resistance values, thus solving the problem that traditional resistors need to be frequently replaced to adjust the resistance value.

[0021] In the embodiment: the carbon film resistor sheet 100 is cut to form N cuts 110 of equal width, and a coating 120 is provided at the bottom position of each cut. The coating 120 is made of silver paste or copper paste.

[0022] Specifically, coating 120 uses silver paste or copper paste. When the carbon film resistor is working, the current passes through the carbon film resistor sheet 100. Due to the presence of coating 120 at the bottom of the cut 110, the problem of potential difference easily generated at the turning point of the current is greatly improved and solved, avoiding current accumulation and potential difference generation. This ensures that the resistor operates stably under complex conditions such as high frequency and high current, extends the service life of the resistor, and improves the reliability of circuit operation.

[0023] In the embodiment, the carbon film resistor sheet 100 has at least two electrode sheets 200 on the surface thereof.

[0024] Specifically, the design of the at least two electrode sheets 200 allows the resistor to be connected with different electrode sheets according to circuit requirements, thereby increasing the flexibility of use of the carbon film resistor.

[0025] The contents not described in detail in the description belong to the prior art known to those skilled in the art, although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement to part of the technical features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A carbon film resistor with easily adjustable resistance, characterized in that: The system includes a carbon film resistor (100) that can be freely cut and has adjustable resistance. The cut carbon film resistor (100) forms N equal-width cuts (110), and there is at least one cut (110). It also includes N+1 new carbon film resistors of equal width connected in series: after cutting, they are connected in series to form N+1 new carbon film resistors (100) of equal width, and the combined resistance of the new carbon film resistors (100) is R. N = (N+1) 2 *R0, where R N The target value of the resistor to be adjusted is given by N, which is the number of cuts, and R0 is the original resistance value of the carbon film before cutting. Both ends of the carbon film resistor sheet (100) are fixedly connected to conductive electrode sheets (200).

2. A carbon film resistor with easily adjustable resistance value according to claim 1, characterized in that: The carbon film resistor sheet (100) is cut into N equal-width cuts (110), and a coating (120) is provided at the bottom position of each cut.

3. A carbon film resistor with easily adjustable resistance value according to claim 1, characterized in that: The carbon film resistor (100) has at least two electrode plates (200) on its surface.

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