Adjustable resistor circuit board and potentiometer

Abstract

The utility model aims to provide an adjustable resistor circuit board and potentiometer, it includes board body, position adjusting subassembly and switch subassembly, on the board body is provided with a plurality of welding contact portion in linear arrangement, position adjusting subassembly includes first carbon film and second carbon film, first carbon film and second carbon film mutually parallel are arranged on the one side face of board body, and the switch subassembly is provided with the first carbon film and the second carbon film. The length of the second carbon film is larger than that of the first carbon film, one end of the first carbon film is electrically connected with one welding contact part, the two ends of the second carbon film are electrically connected with the two welding contact parts respectively, the switch assembly comprises a first metal sheet, a second metal sheet and a third metal sheet, the first metal sheet is arranged on the plate body, and the third metal sheet is arranged on the plate body. The first metal sheet and the second carbon film are distributed in parallel, the first metal sheet is electrically connected with one welding contact part, the second metal sheet and the third metal sheet are arranged on the plate body on the side, away from the second carbon film, of the first metal sheet, and a gap is formed between the second metal sheet and the third metal sheet.

Description

Technical Field

[0001] The utility model relates to the technical field of potentiometers, in particular to an adjustable resistance circuit board and a potentiometer. Background Art

[0002] A potentiometer is a resistor element with three terminals and whose resistance value can be adjusted according to a certain law. The potentiometer contains a circuit board, and the brush head is driven by the lever to slide on the circuit board to adjust the resistance value on the circuit board.

[0003] For example, a Chinese patent document with publication number CN101763927B discloses a sliding potentiometer and its circuit board and potentiometer body, which includes a potentiometer body and a circuit board on which circuit elements can be installed. The potentiometer body includes a housing, a lever and a conductive spring. The circuit board has a first surface and a second surface. The first surface is attached with a resistance film. The housing is fixed on the first surface of the circuit board. The lever and the housing slide together and can reciprocate in a straight line. The conductive spring is positioned on the lever, and the conductive spring is in electrical contact with the resistance film. In this way, by moving the lever, the lever drives the conductive spring to contact and slide on the resistance film, thereby achieving the purpose of adjusting the resistance.

[0004] However, the existing potentiometer circuit board only has a resistance film for contact with the conductive spring, and the circuit board is often installed and used as an independent device with the housing and the lever, and the function is too single. Therefore, in order to improve the functionality of the circuit board, an adjustable resistance circuit board and potentiometer of the present application are proposed. Utility Model Content

[0005] The purpose of the utility model is to overcome the deficiencies in the prior art and provide an adjustable resistance circuit board and a potentiometer with both resistance adjustment and switch functions.

[0006] The purpose of this utility model is achieved through the following technical solutions:

[0007] An adjustable resistance circuit board, comprising:

[0008] A plate body, on which a plurality of welding contacts arranged in a straight line are arranged;

[0009] a positioning component, the positioning component comprising a first carbon film and a second carbon film, the first carbon film and the second carbon film being arranged parallel to each other on one side of the plate body, the length of the second carbon film being greater than the length of the first carbon film, one end of the first carbon film being electrically connected to one of the welding contacts, and two ends of the second carbon film being electrically connected to two of the welding contacts respectively; and

[0010] A switch assembly, the switch assembly comprising a first metal sheet, a second metal sheet and a third metal sheet, the first metal sheet being arranged on the plate body, the first metal sheet being arranged in parallel with the second carbon film, and the first metal sheet being electrically connected to one of the welding contacts, the second metal sheet and the third metal sheet being arranged on the plate body on a side of the first metal sheet away from the second carbon film, a gap being arranged between the second metal sheet and the third metal sheet, and the second metal sheet and the third metal sheet being electrically connected to two of the welding contacts respectively;

[0011] The soldering contacts electrically connected to the two ends of the second carbon film, the first carbon film, the first metal sheet, the second metal sheet, and the third metal sheet are independent structures.

[0012] Optionally, a plurality of via holes are formed on the plate body, and each of the solder contacts is disposed in each of the via holes in a one-to-one correspondence.

[0013] Optionally, the solder contact portion includes two solder contact pads, the two solder contact pads are respectively located at two ends of the via hole, and the two solder contact pads are electrically connected to each other.

[0014] Optionally, the positioning assembly further includes an adhesive layer, the adhesive layer is disposed on the plate body, and the first carbon film is adhered to a surface of the adhesive layer.

[0015] Optionally, the positioning component further includes two base copper foils, the two base copper foils are arranged on the plate body at an interval, and two ends of the second carbon film are respectively attached to the two base copper foils.

[0016] Optionally, the first metal sheet, the second metal sheet, and the third metal sheet are all copper structures.

[0017] Optionally, a plurality of external copper sheets are further provided on a side surface of the plate body away from the positioning assembly, a gap is provided between each of the external copper sheets, and each of the external copper sheets is electrically connected to each of the soldering contacts, respectively.

[0018] A potentiometer comprises any one of the above-mentioned adjustable resistance circuit boards, and also comprises a buckle shell, a shift block and two conductive brushes, wherein the buckle shell is buckled on the board body, the shift block is slidably arranged between the buckle shell and the board body, and one end of the shift block extends from the buckle shell, and two conductive brushes are arranged at intervals on one end of the shift block close to the board body, one of the conductive brushes is electrically connected to the first carbon film and the second carbon film respectively, and one end of the other conductive brush is electrically connected to the first metal sheet, and the other end is electrically connected to one of the second metal sheet and the third metal sheet.

[0019] Optionally, the conductive brush includes a reed and two contacts, one end of the reed is arranged on the shift block, and the two contacts are arranged at intervals on the other end of the reed.

[0020] Optionally, the contact includes at least one contact tooth, and a gap is provided between each of the contact teeth.

[0021] Compared with the prior art, the utility model has at least the following advantages:

[0022] The utility model discloses an adjustable resistance circuit board and a potentiometer, comprising a board body, a position adjustment component and a switch component, wherein a plurality of welding contacts arranged in a straight line are arranged on the board body, the position adjustment component comprises a first carbon film and a second carbon film, the first carbon film and the second carbon film are arranged on a side surface of the board body in parallel with each other, and the length of the second carbon film is greater than that of the first carbon film, one end of the first carbon film is electrically connected to one of the welding contacts, and two ends of the second carbon film are respectively electrically connected to two of the welding contacts, and the switch component comprises a first metal sheet, a second metal sheet and a third metal sheet, the first metal sheet is arranged on the board body, and the first metal sheet and the second carbon film are distributed in parallel, and the first metal sheet is electrically connected to one of the welding contacts, the second metal sheet and the third metal sheet are both arranged on the board body on the side of the first metal sheet away from the second carbon film, and a gap is arranged between the second metal sheet and the third metal sheet, and the second metal sheet and the third metal sheet are respectively electrically connected to two of the welding contacts, and the welding contacts electrically connected to the two ends of the second carbon film, the first carbon film, the first metal sheet, the second metal sheet and the third metal sheet are independent structures. In this way, resistance adjustment is achieved by providing the first carbon film and the second carbon film, and then a switch function can be achieved by providing the first metal sheet, the second metal sheet and the third metal sheet at a position adjacent to the second carbon film. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a structural schematic diagram of one side of an adjustable resistance circuit board according to one embodiment of the utility model;

[0025] Figure 2 It is a schematic cross-sectional structure diagram of a welding contact portion according to an embodiment of the present utility model;

[0026] Figure 3 for Figure 1 A schematic diagram of the structure of another side of the adjustable resistor circuit board shown;

[0027] Figure 4 This is a schematic structural diagram of a first carbon film according to an embodiment of the present invention;

[0028] Figure 5 This is a schematic structural diagram of a second carbon film according to one embodiment of the present invention;

[0029] Figure 6 It is a schematic structural diagram of a potentiometer according to one embodiment of the utility model;

[0030] Figure 7 It is a schematic structural diagram of a conductive brush according to one embodiment of the utility model.

[0031] Description of reference numerals:

[0032] 100, adjustable resistor circuit board; 110, board body; 120, adjustment component; 130, switch component; 140, solder contact; 121, first carbon film; 122, second carbon film; 131, first metal sheet; 132, second metal sheet; 133, third metal sheet; 111, via hole; 141, solder contact pad; 123, adhesive layer; 124, base copper foil; 150, external copper sheet; 10, potentiometer; 200, buckle shell; 300, shift block; 400, conductive brush; 210, card; 410, reed; 420, contact; 421, contact tooth. DETAILED DESCRIPTION

[0033] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the accompanying drawings. The accompanying drawings show preferred embodiments of the present invention.

[0034] like Figure 1As shown, an adjustable resistance circuit board 100 includes a board body 110, a position adjustment component 120 and a switch component 130. A plurality of solder contacts 140 arranged in a straight line are arranged on the board body 110. The position adjustment component 120 includes a first carbon film 121 and a second carbon film 122. The first carbon film 121 and the second carbon film 122 are arranged parallel to each other on one side of the board body 110, and the length of the second carbon film 122 is greater than the length of the first carbon film 121. One end of the first carbon film 121 is electrically connected to one of the solder contacts 140, and the two ends of the second carbon film 122 are respectively electrically connected to two of the solder contacts 140. The switch component 130 includes a first metal sheet 131, a second metal sheet 132 and a third metal sheet 133. The sheet 131 is arranged on the plate body 110, and the first metal sheet 131 is distributed parallel to the second carbon film 122, and the first metal sheet 131 is electrically connected to one of the welding contacts 140. The second metal sheet 132 and the third metal sheet 133 are both arranged on the plate body 110 on the side of the first metal sheet 131 away from the second carbon film 122, and a gap is arranged between the second metal sheet 132 and the third metal sheet 133, and the second metal sheet 132 and the third metal sheet 133 are respectively electrically connected to two of the welding contacts 140, and the welding contacts 140 electrically connected to the two ends of the second carbon film 122, the first carbon film 121, the first metal sheet 131, the second metal sheet 132, and the third metal sheet 133 are independent structures.

[0035] It should be noted that the first carbon film 121 and the second carbon film 122 are arranged on the plate body 110 in parallel with each other, and a gap is provided between the first carbon film 121 and the second carbon film 122. One end of the first carbon film 121 is electrically connected to one of the solder contacts 140. It should be noted that the electrical connection in the present application refers to a structure in which the connection is achieved through copper foil. Further, the two ends of the second carbon film 122 are also electrically connected to a solder contact 140 respectively. Further, a first metal sheet 131 is provided at a position adjacent to the second carbon film 122, and then a second metal sheet 132 and a third metal sheet 133 are respectively provided on the side of the first metal sheet 131 away from the second carbon film 122, wherein a gap is provided between the second metal sheet 132 and the third metal sheet 133. Further, the first metal sheet 131, the second metal sheet 132, and the third metal sheet 133 are each electrically connected to one of the solder contacts 140 respectively. In this way, by connecting with each solder contact 140, the first carbon film 121, the second carbon film 122, the first metal sheet 131, the second metal sheet 132 and the third metal sheet 133 can be indirectly connected. In this way, when a conductive spring is set between the first carbon film 121 and the second carbon film 122 for sliding connection, a conductive spring is set between the first metal sheet 131 and the second metal sheet 132 / the third metal sheet 133 for sliding connection, and both conductive springs are fixedly connected to the lever, and the lever drives the two conductive springs to slide at the same time, in this way, the first conductive spring can change the resistance value of the first carbon film 121, while the second conductive spring can ensure that the first metal sheet 131 is only conductive with one of the second metal sheet 132 and the third metal sheet 133 at any time, so as to have the function of on / off. For example, when the second conductive spring is connected to the first metal sheet 131 and the third metal sheet 133 respectively, it is turned on, and when the second conductive spring is connected to the first metal sheet 131 and the second metal sheet 132 respectively, it is turned off. In this way, the functions of turning on and off are added on the basis of the adjustable resistance, so that the adjustable resistance circuit board 100 of the present application can be applied to the switch structure of tools such as electric drills. Specifically, by applying force to the lever, after the electric drill is started, as the lever continues to slide, the resistance value is adjusted, thereby increasing the speed of the electric drill.

[0036] like Figure 1 and Figure 2 As shown, in one embodiment, a plurality of via holes 111 are provided on the board body 110, and each solder contact portion 140 is disposed in each via hole 111 in a one-to-one correspondence. It should be noted that, in order to improve the utilization rate of the two side surfaces of the board body 110 and enable both ends of the second carbon film 122 to be connected to a solder contact portion 140, a via hole 111 is provided at a position corresponding to each solder contact portion 140 on the board body 110, so that the solder contact portion 140 is located in the via hole 111. In this way, the solder contact portion 140 extends from one side surface of the board body 110 to the other side surface.

[0037] like Figures 1 to 3 As shown, in one embodiment, the solder contact portion 140 includes two solder contact pads 141 , the two solder contact pads 141 are respectively located at two ends of the via hole 111 , and the two solder contact pads 141 are electrically connected to each other.

[0038] Specifically, a solder contact pad 141 is provided at both ends of the via 111, and the solder contact pad 141 is electrically connected through the via 111. For example, a copper layer is formed on the inner side wall of the via 111 by copper deposition, so that the copper layer is respectively connected to the two solder contact pads 141. In this way, wiring can be respectively provided on both sides of the board body 110, so that both ends of the second carbon film 122 are connected to the solder contact portion 140.

[0039] like Figure 4 As shown, in one embodiment, the positioning component 120 further includes an adhesive layer 123 , the adhesive layer 123 is disposed on the plate body 110 , and the first carbon film 121 is attached to the surface of the adhesive layer 123 .

[0040] It should be noted that in order to improve the firmness of the first carbon film 121 on the plate 110 , a bonding layer 123 is first coated on the plate 110 , and then the first carbon film 121 is covered on the bonding layer 123 . In this way, the bonding layer 123 is used to improve the firmness of the first carbon film 121 .

[0041] like Figure 5 As shown, in one embodiment, the positioning component 120 further includes two base copper foils 124 , which are spaced apart on the board 110 , and two ends of the second carbon film 122 are respectively attached to the two base copper foils 124 .

[0042] It should be noted that, in order to prevent the conductive spring from sliding out of the two ends of the second carbon film 122 when the lever drives the conductive spring to slide, a base copper foil 124 is respectively provided at the bottom of the two ends of the second carbon film 122, and then the two ends of the second carbon film 122 are covered on the two base copper foils 124. In this way, the second carbon film 122 has a structure with high ends and low middle, and when the conductive spring slides to the position of the base copper foil 124, the conductive spring is subject to a certain resistance, which is fed back to the user through the lever.

[0043] In one embodiment, the first metal sheet 131 , the second metal sheet 132 , and the third metal sheet 133 are all made of copper. Specifically, the first metal sheet 131 , the second metal sheet 132 , and the third metal sheet 133 are all formed by etching the copper layer on the board 110 .

[0044] like Figure 3As shown, in one embodiment, a plurality of external copper sheets 150 are further disposed on one side of the plate body 110 away from the positioning assembly 120 , with intervals provided between the external copper sheets 150 , and each external copper sheet 150 is electrically connected to each solder contact portion 140 .

[0045] It should be noted that, in order to facilitate electrical connection between each solder contact 140 and other conductive components, a plurality of external copper sheets 150 are provided on one side of the plate body 110 away from the first carbon film 121, wherein a gap is provided between each external copper sheet 150. In this way, each solder contact 140 provides a connection position for external connection.

[0046] like Figure 6 and Figure 7 As shown, a potentiometer 10 includes the above-mentioned adjustable resistance circuit board 100, and also includes a buckle shell 200, a shift block 300 and two conductive brushes 400. The buckle shell 200 is buckled on the board body 110, the shift block 300 is slidably set between the buckle shell 200 and the board body 110, and one end of the shift block 300 extends out from the buckle shell 200. The two conductive brushes 400 are arranged at intervals on one end of the shift block 300 close to the board body 110, one of the conductive brushes 400 is electrically connected to the first carbon film 121 and the second carbon film 122 respectively, and one end of the other conductive brush 400 is electrically connected to the first metal sheet 131, and the other end is electrically connected to one of the second metal sheet 132 and the third metal sheet 133.

[0047] It should be noted that a plurality of bendable cards 210 are provided on the buckle shell 200. Thus, after the buckle shell 200 is buckled on a side surface of the plate body 110 close to the first carbon film 121, each card 210 is bent, so that the buckle shell 200 and the plate body 110 are clamped and fixed. The shift block 300 is located between the buckle shell 200 and the plate body 110, and one end of the shift block 300 extends from the buckle shell 200. Thus, by shifting the end of the shift block 300 extending out of the buckle shell 200, the shift block 300 can be made to slide along the plate body 110. Furthermore, two conductive brushes 400 are mounted on the shift block 300, and one of the conductive brushes 400 is used to connect the first carbon film 121 and the second carbon film 122 respectively. One end of the other conductive brush 400 is connected to the first metal sheet 131, and the other end is connected to one of the second metal sheet 132 and the third metal sheet 133. Specifically, when the conductive brush 400 is connected to the first metal sheet 131 and the third metal sheet 133, it is in the open state, and when the conductive brush 400 is connected to the first metal sheet 131 and the second metal sheet 132, it is in the closed state. In this way, by toggling the dial block 300, the potentiometer has the function of opening and closing in addition to the function of adjusting the resistance value.

[0048] like Figure 7As shown, in one embodiment, the conductive brush 400 includes a reed 410 and two contacts 420 . One end of the reed 410 is disposed on the shifting block 300 , and the two contacts 420 are disposed on the other end of the reed 410 at intervals.

[0049] Specifically, in order to ensure that both ends of the conductive brush 400 can be stably connected to the first carbon film 121 and the second carbon film 122 (or connected to the first metal sheet 131 and the second metal sheet 132 / the third metal sheet 133), the conductive brush 400 is provided with two contacts 420 at both ends of the reed 410. The reed 410 is a stainless steel sheet with a certain bending degree, so that the reed 410 has a certain elastic force. Furthermore, the contact 420 and the reed 410 are an integrally formed structure.

[0050] Furthermore, if Figure 7 As shown, in one embodiment, the contact 420 includes at least one contact tooth 421, and a gap is provided between each contact tooth 421. In this way, by providing a plurality of contact teeth 421, it is ensured that the contact 420 reliably contacts the first carbon film 121 / the second carbon film 122 / the first metal sheet 131 / the second metal sheet 132 / the third metal sheet 133, thereby avoiding poor contact.

[0051] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. An adjustable resistance circuit board, characterized in that: include: A plate body, on which a plurality of welding contacts arranged in a straight line are arranged; a positioning component, the positioning component comprising a first carbon film and a second carbon film, the first carbon film and the second carbon film being arranged parallel to each other on one side of the plate body, the length of the second carbon film being greater than the length of the first carbon film, one end of the first carbon film being electrically connected to one of the welding contacts, and two ends of the second carbon film being electrically connected to two of the welding contacts respectively; and A switch assembly, the switch assembly comprising a first metal sheet, a second metal sheet and a third metal sheet, the first metal sheet being arranged on the plate body, the first metal sheet being arranged in parallel with the second carbon film, and the first metal sheet being electrically connected to one of the welding contacts, the second metal sheet and the third metal sheet being arranged on the plate body on a side of the first metal sheet away from the second carbon film, a gap being arranged between the second metal sheet and the third metal sheet, and the second metal sheet and the third metal sheet being electrically connected to two of the welding contacts respectively; The soldering contacts electrically connected to the two ends of the second carbon film, the first carbon film, the first metal sheet, the second metal sheet, and the third metal sheet are independent structures.

2. The adjustable resistance circuit board according to claim 1, characterized in that: The plate body is provided with a plurality of via holes, and each of the soldering contacts is arranged in each of the via holes in a one-to-one correspondence.

3. The adjustable resistance circuit board according to claim 2, characterized in that: The soldering contact portion includes two soldering contact pads, which are respectively located at two ends of the via hole and are electrically connected to each other.

4. The adjustable resistance circuit board according to claim 1, characterized in that: The positioning component further includes an adhesive layer, which is disposed on the plate body, and the first carbon film is attached to the surface of the adhesive layer.

5. The adjustable resistance circuit board according to claim 1, characterized in that: The positioning component further includes two base copper foils, which are arranged on the plate body at intervals, and two ends of the second carbon film are respectively attached to the two base copper foils.

6. The adjustable resistance circuit board according to claim 1, characterized in that: The first metal sheet, the second metal sheet, and the third metal sheet are all made of copper.

7. The adjustable resistance circuit board according to claim 1, characterized in that: A plurality of external copper sheets are also arranged on one side of the plate body away from the position adjustment component, and intervals are arranged between the external copper sheets, and the external copper sheets are respectively electrically connected to the welding contacts.

8. A potentiometer, characterized in that: The adjustable resistor circuit board comprises any one of claims 1 to 6, and further comprises a buckle shell, a shift block and two conductive brushes, wherein the buckle shell is buckled on the board body, the shift block is slidably arranged between the buckle shell and the board body, and one end of the shift block extends from the buckle shell, and two conductive brushes are arranged at intervals on one end of the shift block close to the board body, one of the conductive brushes is electrically connected to the first carbon film and the second carbon film respectively, and one end of the other conductive brush is electrically connected to the first metal sheet, and the other end is electrically connected to one of the second metal sheet and the third metal sheet.

9. The potentiometer according to claim 8, characterized in that: The conductive brush comprises a spring sheet and two contacts. One end of the spring sheet is arranged on the shifting block, and the two contacts are arranged on the other end of the spring sheet at intervals.

10. The potentiometer according to claim 9, characterized in that: The contact includes at least one contact tooth, and a gap is arranged between each of the contact teeth.

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