High-frequency low-loss carbon film resistor

Abstract

The utility model relates to carbon film resistance technical field, concretely relates to a high frequency low loss carbon film resistance, including resistance body, the resistance body includes base, the base provides support structure for whole resistance, the base adopts ceramic material, the base surface is fixedly connected with carbon film, and carbon film is used to produce resistance characteristic, the carbon film surface is equipped with spiral groove, spiral groove is used for accurate control resistance value, spiral groove outside is equipped with encapsulation coating, and encapsulation coating is used for protecting resistance body from the influence of external environment, the encapsulation coating surface is equipped with color ring, the base both ends are fixedly connected with lead anchor respectively, lead anchor one end is fixedly connected with copper lead, this high frequency low loss carbon film resistance, the change of resistance value is relatively smaller under different working temperature, this is because carbon film and ceramic base good combination and carbon film itself material characteristic make it can keep relatively stable electron mobility when temperature fluctuation.

Description

TECHNICAL FIELD

[0001] The utility model relates to carbon film resistance technical field, specifically, relate to a high frequency low loss carbon film resistance. BACKGROUND

[0002] The hindering effect of a conductor on current is called the resistance of the conductor, which is a physical quantity representing the magnitude of the hindering effect of a conductor on current, and the greater the resistance of a conductor, the greater the hindering effect of the conductor on current.

[0003] In a high-frequency environment, the structure of the resistor itself can generate parasitic inductance. Although the parasitic inductance of the carbon film resistor is relatively small compared to the wire-wound resistor, it cannot be ignored at high frequencies. Although the carbon film can achieve good resistance function at low frequencies, when the uniformity and compactness of the carbon film are not ideal at high frequencies, it can cause uneven current distribution. When high-frequency current passes through, due to the possible micro-defects in the structure of the carbon film, it can cause the local electric field strength to be too high, thereby causing local overheating and energy loss. The traditional manufacturing process can cause the combination of the carbon film and the ceramic substrate to be imperfect, and in a high-frequency environment, this imperfect combination can cause charge accumulation and scattering at the interface. Moreover, when machining the spiral groove on the carbon film for adjusting the resistance value, if the process is not accurate enough, it can affect the equivalent inductance and capacitance of the resistor at high frequencies, leading to mismatched impedance characteristics and increasing high-frequency loss.

[0004] Therefore, there is an urgent need for a high-frequency low-loss carbon film resistor to improve the deficiencies of the prior art. UTILITY MODEL CONTENTS

[0005] The utility model discloses a high-frequency low-loss carbon film resistor to solve the problems raised in the background art.

[0006] To achieve the above object, the utility model provides a high-frequency low-loss carbon film resistor, including resistance body, the resistance body includes base, the base provides support structure for whole resistance, the base adopts ceramic material, the base surface is fixedly connected with carbon film, and the carbon film is used to produce resistance characteristic, the carbon film surface is equipped with spiral groove, and the spiral groove is used for accurately controlling resistance value, the spiral groove outside is equipped with encapsulation coating, and the encapsulation coating is used for protecting resistance body from the influence of external environment, the encapsulation coating surface is equipped with color ring, and the base both ends are fixedly connected with lead anchor, and one end of lead anchor is fixedly connected with copper lead.

[0007] As a further improvement of the technical solution, the carbon film is formed on the base through high-temperature vacuum coating technology, and the formed carbon film has the characteristics of good uniformity and dense structure, which is beneficial to reduce the loss in the high-frequency signal transmission process, and the number, width and depth of the spiral grooves are designed to accurately control the resistance value and optimize the impedance characteristics of the resistance under high frequency.

[0008] As a further improvement of the technical solution, the packaging coating is made of epoxy resin material, which can prevent moisture and dust, enhance mechanical strength, and effectively protect the internal structure of the resistance body.

[0009] As a further improvement of the technical solution, the lead anchor and the copper lead are connected by welding, which ensures the firmness and good electrical conductivity of the connection.

[0010] Compared with the prior art, the high-frequency low-loss carbon film resistor has the following advantages:

[0011] The high-frequency low-loss carbon film resistor has a relatively small change in resistance value at different working temperatures. This is because the good combination of the carbon film and the ceramic base and the material properties of the carbon film itself enable it to maintain a relatively stable electron mobility when the temperature fluctuates. In some temperature-sensitive circuit environments, such as precision measuring instruments and aerospace electronic equipment, the high-frequency low-loss carbon film resistor can ensure the normal operation of the circuit and reduce measurement errors or equipment failures caused by changes in resistance value. Due to the rationality of the structural design and material selection, the high-frequency low-loss carbon film resistor has a small resistance value drift during long-term use. The carbon film is not easily affected by environmental factors, and the ceramic base can provide long-term stable support for the carbon film. BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 It is a schematic diagram of the overall structure of the embodiment.

[0013] Fig. 2 It is a schematic diagram of the overall structure of the embodiment.

[0014] The meanings of the various reference signs in the drawings are as follows:

[0015] 1, resistance body; 10, packaging coating; 11, color ring; 12, base; 13, carbon film; 14, spiral groove; 15, lead anchor; 16, copper lead. DETAILED DESCRIPTION

[0016] Clearly, the described embodiments are merely a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0017] Please refer to Figs. 1-2 As shown in the figure, the embodiment provides a high-frequency low-loss carbon film resistor, which comprises a resistor body 1, the resistor body 1 comprises a base 12, the base 12 provides a support structure for the whole resistor, the base 12 is made of ceramic material, the surface of the base 12 is fixedly connected with a carbon film 13, the carbon film 13 is used for generating resistance characteristics, the surface of the carbon film 13 is provided with a spiral groove 14, the spiral groove 14 is used for accurately controlling the resistance value, the outside of the spiral groove 14 is provided with an encapsulation coating 10, the encapsulation coating 10 is used for protecting the resistor body 1 from the influence of external environment, the surface of the encapsulation coating 10 is provided with a color ring 11, and the base 12 is fixedly connected with lead anchors 15 at both ends, and the lead anchor 15 is fixedly connected with a copper lead 16 at one end.

[0018] The working principle is as follows: firstly, the base 12 made of ceramic material provides stable support for the whole resistor, the carbon film 13 on the base 12 is a key part for generating resistance characteristics, and when current passes through, it will generate a blocking effect, the spiral groove 14 on the surface of the carbon film 13 can accurately adjust the resistance value, the current path length is adjusted by changing the number, width and depth of the grooves, and then the resistance size is changed, the encapsulation coating 10 can protect the internal structure from the influence of external environmental factors such as water vapor and dust, and ensure the stability of the resistance performance, the color ring 11 on the surface of the encapsulation coating 10 is used for identifying the resistance value and other parameters of the resistor, which is convenient for identification, the lead anchors 15 at both ends of the base 12 are firmly connected with the copper leads 16, and the copper leads 16 realize good electrical connection between the resistor and the external circuit, and ensure that the current flows in and out of the resistor smoothly.

[0019] In order to reduce the loss at high frequency, in the embodiment, the carbon film 13 is formed on the base 12 by high-temperature vacuum coating technology, and the formed carbon film 13 has the characteristics of good uniformity and dense structure, which is beneficial to reduce the loss in the process of high-frequency signal transmission. The number, width and depth of the spiral grooves 14 are designed to accurately control the resistance value and optimize the impedance characteristics of the resistance at high frequency. The carbon film 13 is formed on the ceramic base 12 by high-temperature vacuum coating technology. In the high-temperature vacuum environment, the hydrocarbon is thermally decomposed, and the carbon atoms are uniformly deposited on the surface of the base 12 to form a crystalline carbon film 13. This method can make the thickness and composition uniformity of the carbon film 13 good and the structure dense. The uniform and dense carbon film 13 can reduce the electron scattering phenomenon in the current conduction process and reduce the energy loss caused by microstructure defects inside the resistance. The design of the spiral grooves 14 plays a role in resistance value regulation and high-frequency impedance matching. From the perspective of resistance value, the spiral grooves 14 change the effective path length of the current on the carbon film 13. According to the resistance formula, the resistance value is accurately controlled by adjusting the groove parameters.

[0020] In order to increase the service life, in the embodiment, the packaging coating 10 is made of epoxy resin material, which can prevent moisture, dust and enhance mechanical strength, effectively protect the internal structure of the resistance body 1. The color ring 11 facilitates users to accurately read the resistance value and precision information of the resistance. Epoxy resin has good sealing property and can effectively prevent external water vapor and dust from entering the resistance. Water vapor may corrode the carbon film 13 or the base 12, leading to a decrease in resistance performance or even failure. Dust may cause local electric field distortion and cause additional loss. The epoxy resin coating can prevent these situations from happening.

[0021] In order to improve the conductivity, in the embodiment, the lead anchor 15 and the copper lead 16 are connected by welding, which ensures the firmness and good electrical conductivity of the connection. During the welding process, the solder is melted and filled in the contact interface between the lead anchor 15 and the copper lead 16 by heating. After the solder cools and solidifies, a firm connection body is formed. This connection method can ensure that the contact area between the lead anchor 15 and the copper lead 16 is large and tightly bonded, thereby ensuring good electrical conductivity.

[0022] The high-frequency low-loss carbon film resistor in the embodiment, when used, firstly, the ceramic base 12 provides stable support for the whole resistor, the carbon film 13 on the base is the key part to generate the resistance characteristic, the carbon film 13 is formed on the ceramic base 12 by high-temperature vacuum coating technology, in the high-temperature vacuum environment, the hydrocarbon is thermally decomposed, and carbon atoms are uniformly deposited on the surface of the base 12 to form the crystalline carbon film 13, in this way, the thickness and composition uniformity of the carbon film 13 are good, the structure is dense, the uniformly dense carbon film 13 can reduce the electron scattering phenomenon in the current conduction process and the energy loss caused by the microstructure defects in the resistor, and the spiral groove 14 plays a role in resistance value regulation and high-frequency impedance matching from two aspects, from the resistance value, the spiral groove 14 changes the effective path length of the current on the carbon film 13, according to the resistance formula, the resistance value is accurately controlled by adjusting the groove parameters, and the spiral groove 14 on the surface of the carbon film 13 can accurately adjust the resistance value, the current path length is adjusted by changing the number, width and depth of the grooves, and then the resistance size is changed, the packaging coating 10 can protect the internal structure, the epoxy resin has good sealing performance, can effectively prevent water vapor and dust in the outside from entering the resistor, the water vapor may erode the carbon film 13 or the base 12, and the resistance performance is reduced or even fails, the dust may cause local electric field distortion to cause additional loss, and the epoxy resin coating can prevent these situations from happening, and the resistance performance is stable, the color ring 11 on the surface of the packaging coating 10 is used for identifying the resistance value and the like of the resistor, and the resistance value is easily identified, the lead anchors 15 at both ends of the base 12 are firmly connected with the copper leads 16, and the copper leads 16 realize good electrical connection between the resistor and the external circuit, and ensure that the current flows in and out of the resistor smoothly.

[0023] The basic principle, main characteristics and advantages of the utility model are shown and described above. It should be understood by those skilled in the art that the utility model is not limited by the above embodiments, the above embodiments and the description in the specification are only preferred examples of the utility model, and are not used to limit the utility model, various changes and improvements of the utility model can be made without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed. The protection scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A high-frequency low-loss carbon film resistor comprising a resistor body (1), characterized in that: The resistance body (1) includes a base (12), which provides a support structure for the entire resistance, is made of ceramic material, and has a carbon film (13) fixedly connected to the surface thereof, which is used to generate resistance characteristics, is provided with a spiral groove (14) on the surface thereof, which is used to accurately control the resistance value, is provided with an encapsulation coating (10) outside the spiral groove (14), which is used to protect the resistance body (1) from the external environment, is provided with a color ring (11) on the surface thereof, and has lead anchors (15) fixedly connected to the two ends of the base (12), and the lead anchors (15) are fixedly connected with copper leads (16) at one end.

2. The high frequency low loss carbon film resistor according to claim 1, characterized by: The carbon film (13) is formed on the base (12) by high-temperature vacuum coating technology, and has the characteristics of good uniformity and dense structure, which is beneficial to reduce the loss in the high-frequency signal transmission process, and the number, width and depth of the spiral groove (14) are designed to accurately control the resistance value and optimize the impedance characteristics of the resistance at high frequencies.

3. The high frequency low loss carbon film resistor according to claim 1, wherein: The encapsulation coating (10) is made of epoxy resin material, which can prevent moisture, dust and enhance mechanical strength, effectively protect the internal structure of the resistance body (1), and the color ring (11) is convenient for users to accurately read the resistance value and precision of the resistance.

4. The high frequency low loss carbon film resistor according to claim 1, wherein: The lead anchors (15) and the copper leads (16) are connected by welding, which ensures the firmness and good electrical conductivity of the connection.

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