Sectional circuit board and knob potentiometer
By adopting a segmented circuit board design in the potentiometer and using the combination of copper sliding blocks and chip resistors, the problems of carbon film potentiometer's resistance value drift and poor moisture resistance are solved, and the effect of stabilization of resistance value and improvement of moisture resistance is achieved.
Patent Information
- Application Number
- CN202421036747.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-13
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-05-13
AI Technical Summary
During use, existing carbon film potentiometers are prone to problems such as drift in resistance and poor moisture resistance, resulting in changes in resistance and substrate peeling.
The segmented circuit board design is adopted, and the combination of copper sliding blocks and chip resistors prevents direct contact between the carbon film and the contacts. The resistance value is realized by a resistor band composed of multiple chip resistors, ensuring the stability of the resistance value and improving moisture resistance.
It effectively avoids the resistance value drifting with the increase of use time, improves the wear resistance and moisture resistance of the potentiometer, and ensures the stability and reliability of the circuit board.
Smart Images
Figure CN222619495U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of potentiometers, in particular to a segmented circuit board and a knob potentiometer. Background Art
[0002] Carbon film potentiometer refers to a potentiometer that uses a knob to drive the contact to slide on the carbon film, thereby changing the effective conductive area on the carbon film and changing the resistance value. The carbon film is formed by coating the surface of the substrate with ground carbon black, graphite, quartz and other materials. The above process is simple and is currently the most widely used potentiometer.
[0003] However, the existing carbon film potentiometers have the following deficiencies in actual use: the carbon film is in frictional contact with the contacts for a long time, which easily changes the resistance value of the carbon film, causing the resistance value of the carbon film to drift as the use time increases; secondly, the carbon film has poor moisture resistance, and the carbon film resistor changes its resistance value when used in a humid environment for a long time, and it is easy to peel off from the substrate. Therefore, in order to solve the above technical problems, the segmented circuit board and knob potentiometer of the present application are proposed. Utility Model Content
[0004] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a carbon film resistor that is not in direct contact with the brush, but is divided into several equal parts by a segmented circuit board and a knob potentiometer designed in the manner of a chip resistor, so that the resistance value will not change with the increase of use time and has good moisture resistance.
[0005] The purpose of this utility model is achieved through the following technical solutions:
[0006] A segmented circuit board, comprising:
[0007] A substrate, the substrate comprising a sliding contact surface and a welding surface arranged opposite to each other, and a through hole is formed on the substrate; and
[0008] A sliding adjustment component, the sliding adjustment component includes a reference ring, a reference external block, two sliding external blocks, a plurality of copper sliding blocks, a plurality of connecting strips and a plurality of resistors, the reference ring is arranged on the sliding contact surface, and the reference ring is coaxially distributed with the via hole, the reference external block is arranged on the welding surface, and the reference external block is electrically connected to the reference ring, each of the copper sliding blocks is circumferentially arranged at equal angles on the sliding contact surface, and each of the copper sliding blocks is located on the outside of the reference ring, each of the connecting strips is circumferentially arranged on the welding surface, and each of the connecting strips is distributed opposite to each of the copper sliding blocks in a one-to-one correspondence, each of the resistors is arranged on the welding surface, and each of the resistors is connected end to end with each of the connecting strips in sequence, and each of the resistors is connected end to end with each of the copper sliding blocks in sequence, one of the two sliding external blocks is arranged on the sliding contact surface, and the other is arranged on the welding surface, and the two sliding external blocks are electrically connected to the resistor located in the first position and the resistor located in the last position, respectively.
[0009] Optionally, the substrate is in a circular ring structure.
[0010] Optionally, the reference ring, the reference external block, and the sliding external block are all copper foil.
[0011] Optionally, the distance between any two adjacent copper sliding blocks is 0.8 mm to 1.2 mm.
[0012] Optionally, the resistor is a chip resistor.
[0013] Optionally, an insulating layer is further provided on the welding surface, and the insulating layer covers each of the connecting strips.
[0014] A knob potentiometer comprises any of the above-mentioned segmented circuit boards, and also comprises a fixing seat, a buckle ring, a rotating ring and a retaining ring, wherein the fixing seat is provided with an annular groove, the substrate is accommodated in the annular groove, the rotating ring is rotatably arranged on the substrate, the retaining ring is sleeved on the rotating ring, the buckle ring is buckled on the fixing seat, and the buckle ring is clamped with the retaining ring.
[0015] Optionally, a plurality of positioning grooves are formed on the inner side wall of the annular groove, and a plurality of positioning blocks are disposed on the outer side wall of the substrate, and each of the positioning blocks is accommodated in each of the positioning grooves in a one-to-one correspondence.
[0016] Optionally, a plurality of air-avoiding grooves are formed on the bottom wall of the annular groove, and each resistor is respectively accommodated in each of the air-avoiding grooves.
[0017] Optionally, a boss is provided on one side of the retaining ring close to the rotating ring, and a plurality of slots are provided on one side of the rotating ring close to the retaining ring, so that the boss is accommodated in one of the slots when the rotating ring is rotated under force.
[0018] Compared with the prior art, the utility model has at least the following advantages:
[0019] In the present application, the copper sliding block is set as a structure for contact friction contact, and multiple resistors are welded on the side surface different from the copper sliding block through connecting strips, so that each resistor and each connecting strip form a resistance belt. When the contact slides and contacts any copper sliding block, the resistor connected to the copper sliding block to the first / last resistor are all connected to the circuit. Since the copper sliding block is harder than the carbon film, it has better wear resistance. In addition, conventional resistors are used instead of carbon film resistors, so the moisture resistance is also better. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] 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.
[0021] Figure 1 It is a structural schematic diagram of a segmented circuit board according to one embodiment of the utility model;
[0022] Figure 2 for Figure 1 A schematic structural diagram of the segmented circuit board from another angle shown;
[0023] Figure 3 This is a schematic structural diagram of a knob potentiometer according to one embodiment of the utility model;
[0024] Figure 4 It is a schematic structural diagram of a fixing base according to one embodiment of the utility model.
[0025] Description of reference numerals:
[0026] 10. Segmented circuit board; 100. Base plate; 110. Sliding surface; 120. Welding surface; 130. Via hole; 210. Reference ring; 220. Reference external block; 230. Sliding external block; 240. Copper sliding block; 250. Connecting strip; 260. Resistor; 1. Knob potentiometer; 10. Segmented circuit board; 20. Fixed seat; 30. Rotary ring; 40. Positioning ring; 50. Retaining ring; 21. Annular groove; 22. Positioning groove; 150. Positioning block; 23. Avoidance groove; 41. Boss; 31. Slot. DETAILED DESCRIPTION
[0027] 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.
[0028] like Figure 1 and Figure 2 As shown, a segmented circuit board 10 includes a substrate 100 and a sliding adjustment component, the substrate 100 includes a sliding contact surface 110 and a welding surface 120 arranged opposite to each other, a through hole 130 is opened on the substrate 100, the sliding adjustment component includes a reference ring 210, a reference external block 220, two sliding external blocks 230, a plurality of copper sliding blocks 240, a plurality of connecting strips 250 and a plurality of resistors 260, the reference ring 210 is arranged on the sliding contact surface 110, and the reference ring 210 and the through hole 130 are coaxially distributed, the reference external block 220 is arranged on the welding surface 120, and the reference external block 220 is electrically connected to the reference ring 210, and each copper sliding block 240 is arranged at equal angles in a circle. It is placed on the sliding surface 110, and each copper sliding block 240 is located on the outside of the reference ring 210, each connecting strip 250 is arranged circumferentially on the welding surface 120, and each connecting strip 250 and each copper sliding block 240 are distributed opposite to each other in a one-to-one correspondence, each resistor 260 is arranged on the welding surface 120, and each resistor 260 is connected to each connecting strip 250 end to end in sequence, and each resistor 260 is connected to each copper sliding block 240 end to end in sequence, one of the two sliding external blocks 230 is arranged on the sliding surface 110, and the other is arranged on the welding surface 120, and the two sliding external blocks 230 are electrically connected to the resistor 260 located in the first position and the resistor 260 located in the last position, respectively.
[0029] It should be noted that, in one embodiment, the substrate 100 is an annular structure. The substrate 100 has two side surfaces, which are respectively defined as a sliding contact surface 110 and a welding surface 120. A via 130 extending from the sliding contact surface 110 to the welding surface 120 is provided on the substrate 100. The reference ring 210 is arranged on the sliding contact surface 110, and the reference ring 210 and the via 130 are coaxially arranged. Further, the reference external block 220 is arranged on the welding surface 120, and the reference external block 220 is connected to the reference ring 210. It should be noted that the reference external block 220 is located at the edge of the welding surface 120. Each copper sliding block 240 is also circumferentially arranged on the sliding contact surface 110, and the annular structure formed by each copper sliding block 240 is located outside the reference ring 210. The distance between any two adjacent copper sliding blocks 240 is consistent, and the distance between any copper sliding block 240 and the reference ring 210 is also consistent. Further, each connecting bar 250 is arranged on the welding surface 120, and each connecting bar 250 is aligned with each copper sliding block 240 respectively. Further, each resistor 260 is also welded on the welding surface 120, and each resistor 260 is connected to each connecting bar 250 end to end in sequence, and each resistor 260 is also connected to each copper sliding block 240 end to end in sequence. Further, two sliding external blocks 230 are respectively arranged on the sliding contact surface 110 and the welding surface 120, one of which is electrically connected to the resistor 260 in the first position, and the other sliding external block 230 is electrically connected to the resistor 260 in the last position. In this way, compared with the existing carbon film potentiometer, the copper sliding block 240 in the present application is set as a structure for contact friction contact, and multiple resistors 260 are welded on the side surface different from the copper sliding block 240 through the connecting strip 250, so that each resistor 260 and each connecting strip 250 form a resistance belt. As the contact slides and contacts any copper sliding block 240, the resistor 260 connected to the copper sliding block 240 to the first / last position resistor 260 are all connected to the circuit. Since the copper sliding block 240 is harder than the carbon film, it has better wear resistance. In addition, conventional resistors 260 are used instead of carbon film resistors, so the moisture resistance is also better.
[0030] In one embodiment, the reference ring 210, the reference external block 220, and the sliding external block 230 are all made of copper foil. For example, the reference ring 210, the reference external block 220, the sliding external block 230, the copper sliding block 240, and the connecting strip 250 are a circuit board structure formed by etching a copper clad laminate, wherein the substrate 100 is made of glass fiber.
[0031] like Figure 2As shown, in one embodiment, the distance D between any two adjacent copper sliding blocks 240 is 0.8 mm to 1.2 mm. For example, the distance between any two adjacent copper sliding blocks 240 can also be 1 mm. In this way, when the contact slides, the contact can quickly slide between the two adjacent copper sliding blocks 240.
[0032] In one embodiment, the resistor 260 is a chip resistor. Thus, compared with a plug-in resistor, the use of a chip resistor can reduce the volume of the segmented circuit board 10.
[0033] In one embodiment, an insulating layer is further provided on the welding surface 120, and the insulating layer covers each connecting bar 250. In this way, the insulating layer can be used to protect each connecting bar 250. In one embodiment, the insulating layer is insulating green oil.
[0034] like Figure 3 and Figure 4 As shown, a knob potentiometer 1 includes a segmented circuit board 10, a fixing base 20, a rotating ring 30, a locking ring 40 and a buckle 50. The fixing base 20 is provided with an annular groove 21, a substrate 100 is accommodated in the annular groove 21, the rotating ring 30 is rotatably arranged on the substrate 100, the locking ring 40 is sleeved on the rotating ring 30, the buckle 50 is buckled on the fixing base 20, and the buckle 50 is buckled with the locking ring 40.
[0035] It should be noted that the substrate 100 is accommodated in the annular groove 21, and then the rotating ring 30 is also placed in the annular groove 21. In one embodiment, the contact is used to be installed on a side surface of the rotating ring 30 close to the substrate 100, so that the contact abuts against the reference ring 210 of the substrate 100 and one of the copper sliding blocks 240 therein. The locking ring 40 is sleeved on the outer side of the rotating ring 30, the buckle ring 50 is buckled and fixed with the fixing seat 20, and the buckle ring 50 is buckled and fixed with the locking ring 40. In this way, under the action of the buckle ring 50, the locking ring 40 and the rotating ring 30 are kept in abutment with each other, and the rotating ring 30 and the substrate 100 are in a stable state of abutment. In this way, when a torque is applied to the rotating ring 30, the rotating ring 30 drives the contact to slide on the substrate 100 to adjust the resistance value.
[0036] like Figure 1 , Figure 2 and Figure 4 As shown, in one embodiment, a plurality of positioning grooves 22 are provided on the inner side wall of the annular groove 21, and a plurality of positioning blocks 150 are provided on the outer side wall of the substrate 100, and each positioning block 150 is correspondingly accommodated in each positioning groove 22. In this way, by accommodating and installing the positioning blocks 150 in the positioning grooves 22, the substrate 100 can be prevented from rotating in the annular groove 21.
[0037] like Figure 4As shown, in one embodiment, a plurality of air-avoiding grooves 23 are formed on the bottom wall of the annular groove 21 , and each resistor 260 is respectively accommodated in each air-avoiding groove 23 .
[0038] It should be noted that, in order to prevent the resistor 260 from being damaged by compression, a plurality of escape grooves 23 are opened at corresponding positions on the bottom wall of the annular groove 21 , so that each resistor 260 can be accommodated in each escape groove 23 .
[0039] like Figure 3 As shown, in one embodiment, a boss 41 is provided on one side of the retaining ring 40 close to the rotating ring 30, and a plurality of slots 31 are provided on one side of the rotating ring 30 close to the retaining ring 40. When the rotating ring 30 is rotated under force, the boss 41 is accommodated in one of the slots 31.
[0040] It should be noted that in order to make the contact fixedly contact with a certain position of the reference ring 210 and the copper sliding block 240, the above structure is provided. Specifically, the locking ring 40 is clamped and fixed by the buckle ring 50, and it is in a fixed position. The rotating ring 30 can drive the contact to rotate relative to the locking ring 40. In this way, when the boss 41 falls into one of the slots 31 and is stuck, the rotating ring 30 needs to apply more torque to continue to rotate, thus improving the structural stability of the rotating ring 30.
[0041] 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. A segmented circuit board, characterized in that: include: A substrate, the substrate comprising a sliding contact surface and a welding surface arranged opposite to each other, and a through hole is opened on the substrate; and A sliding adjustment component, the sliding adjustment component includes a reference ring, a reference external block, two sliding external blocks, a plurality of copper sliding blocks, a plurality of connecting strips and a plurality of resistors, the reference ring is arranged on the sliding contact surface, and the reference ring is coaxially distributed with the via hole, the reference external block is arranged on the welding surface, and the reference external block is electrically connected to the reference ring, each of the copper sliding blocks is circumferentially arranged at equal angles on the sliding contact surface, and each of the copper sliding blocks is located on the outside of the reference ring, each of the connecting strips is circumferentially arranged on the welding surface, and each of the connecting strips is distributed opposite to each of the copper sliding blocks in a one-to-one correspondence, each of the resistors is arranged on the welding surface, and each of the resistors is connected end to end with each of the connecting strips in sequence, and each of the resistors is connected end to end with each of the copper sliding blocks in sequence, one of the two sliding external blocks is arranged on the sliding contact surface, and the other is arranged on the welding surface, and the two sliding external blocks are electrically connected to the resistor located in the first position and the resistor located in the last position, respectively.
2. The segmented circuit board according to claim 1, characterized in that: The substrate is in a circular ring structure.
3. The segmented circuit board according to claim 1, characterized in that: The reference ring, the reference external block, and the sliding external block are all made of copper foil.
4. The segmented circuit board according to claim 1, characterized in that: The distance between any two adjacent copper sliding blocks is 0.8 mm to 1.2 mm.
5. The segmented circuit board according to claim 1, characterized in that: The resistor is a chip resistor.
6. The segmented circuit board according to claim 1, characterized in that: An insulating layer is also provided on the welding surface, and the insulating layer covers each of the connecting strips.
7. A knob potentiometer, characterized in that: It includes a segmented circuit board as described in any one of claims 1 to 6, and also includes a fixing seat, a buckle ring, a rotating ring and a locking ring, the fixing seat is provided with an annular groove, the substrate is accommodated in the annular groove, the rotating ring is rotatably arranged on the substrate, the locking ring is sleeved on the rotating ring, the buckle ring is buckled on the fixing seat, and the buckle ring is clamped with the locking ring.
8. The knob potentiometer according to claim 7, characterized in that: A plurality of positioning grooves are formed on the inner side wall of the annular groove, and a plurality of positioning blocks are formed on the outer side wall of the base plate. The positioning blocks are accommodated in the positioning grooves in a one-to-one correspondence.
9. The knob potentiometer according to claim 7, characterized in that: The bottom wall of the annular groove is provided with a plurality of air-avoiding grooves, and each of the resistors is respectively accommodated in each of the air-avoiding grooves.
10. The knob potentiometer according to claim 7, characterized in that: A boss is arranged on one side of the locking ring close to the rotating ring, and a plurality of slots are opened on one side of the rotating ring close to the locking ring. When the rotating ring is rotated under force, the boss is accommodated in one of the slots.