A rotary chip resistor sensor

Abstract

The utility model belongs to the technical field of electronic equipment, disclose a kind of rotary chip resistor type sensor.The rotary chip resistor type sensor includes the rotor, carbon sheet, terminal, body and upper cover of coaxial arrangement, rotor includes shaft core and brush, shaft core is used to connect with external shaft, brush is fixedly connected with shaft core, brush is set between shaft core and carbon sheet, carbon sheet is close to the side of brush and is provided with resistor body, brush can contact with resistor body and rotate relative to carbon sheet, carbon sheet and terminal are arranged in body, and the pin of terminal extends out of body, upper cover and body are coaxially arranged, and upper cover and body are detachably connected, upper cover and body have accommodating space between them, rotor, carbon sheet and terminal are embedded in accommodating space, to ensure that the rotary chip resistor type sensor SMT is welded, and the large gap between body and shell caused by heating is avoided, the thickness of rotary chip resistor type sensor is reduced, the use space is saved, and the user is convenient to install and arrange.

Description

Technical Field

[0001] This utility model relates to the field of electronic equipment technology, and in particular to a rotating patch resistive sensor. Background Technology

[0002] A rotary patch resistive sensor, also known as a patch potentiometer, is a sensor that converts angular displacement into changes in resistance or voltage signals. It achieves continuously varying electrical signal output by rotating a brush that slides across a resistive diaphragm. Due to its simple structure, low cost, and compatibility with analog outputs, it is widely used in applications requiring angle or position detection, such as headphones, smart homes, robot joints, and automotive center console knobs.

[0003] In related technologies, the structure of a rotary surface mount resistive sensor mainly consists of a ring-shaped carbon film resistive element (i.e., carbon sheet), a rotor, a shaft, terminals, and a housing. Rotary surface mount resistive sensors are generally directly mounted on the surface of a printed circuit board (PCB) using SMT (Surface Mount Technology) and soldered using reflow soldering, achieving high-density, high-reliability, and automated production.

[0004] However, due to the combined thickness of the carbon film, the shaft height, and the outer shell, and because the product does not have a large gap between the body and the shell after SMT soldering due to heat, the product thickness is further increased, making it difficult for conventional rotary surface mount resistive sensor packages to meet users' installation requirements. Utility Model Content

[0005] The purpose of this invention is to provide a rotary patch resistive sensor, which has a small thickness and is easy to install and arrange.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A rotary patch resistive sensor is provided, comprising: a rotor, a carbon sheet, terminals, a body, and a top cover. The rotor, carbon sheet, terminals, and body are coaxially arranged. The rotor includes a shaft and a brush. The shaft is used to connect to an external rotating shaft. The brush is fixedly connected to the shaft and disposed between the shaft and the carbon sheet. A resistive element is disposed on the side of the carbon sheet near the brush. The brush can contact the resistive element and rotate relative to the carbon sheet. The carbon sheet and terminals are disposed in the body, and the pins of the terminals extend out of the body. The top cover and body are coaxially arranged and detachably connected. There is a receiving space between the top cover and the body, and the rotor, carbon sheet, and terminals are embedded in the receiving space.

[0008] Preferably, the rotary patch resistive sensor also has a snap-fit ​​structure, which includes a snap-fit ​​piece disposed on one of the outer peripheral surface of the top cover and the outer peripheral surface of the body, and a snap-fit ​​block disposed on the other of the outer peripheral surface of the top cover and the outer peripheral surface of the body. The snap-fit ​​piece is provided with a snap-fit ​​hole, and the snap-fit ​​block can snap into the snap-fit ​​hole or disengage from the snap-fit ​​hole.

[0009] Preferably, the snap-fit ​​tab is an elastic tab.

[0010] Preferably, the rotary patch resistive sensor also includes multiple snap-fit ​​structures spaced apart.

[0011] Preferably, the shaft and brush are integrally formed.

[0012] Preferably, a through hole is provided on the shaft core along the axial direction of the rotor, through which the external rotating shaft can pass. The inner wall of the through hole is provided with a first anti-rotation plane, which is used to fit with a second anti-rotation plane on the outer periphery of the external rotating shaft.

[0013] Preferably, one of the carbon sheet and the terminal is provided with a plurality of connection holes spaced apart, and the other of the carbon sheet and the terminal is provided with a plurality of connectors spaced apart, and the plurality of connectors are riveted to the plurality of connection holes one by one.

[0014] Preferably, the riveted carbon sheet and terminal are encapsulated in plastic within the body.

[0015] Preferably, the carbon sheet is provided with positioning holes for connection with the plastic coating mold; and / or, a positioning post is provided on the side of the body away from the terminal for connection with the PCB board to be connected.

[0016] Preferably, the brush is made of copper alloy material by stamping; and / or, the carbon sheet is made of fiberglass board material.

[0017] The beneficial effects of this utility model are as follows:

[0018] A rotary surface mount resistive sensor is provided, comprising: a rotor, a carbon chip, terminals, a body, and a top cover coaxially arranged. The top cover and the body are detachably connected, and there is a receiving space between the top cover and the body. The rotor, carbon chip, and terminals are embedded in the receiving space. By providing a top cover, and ensuring that the top cover and the body are detachably connected, it is ensured that after the rotary surface mount resistive sensor is SMT soldered, a large gap will not appear between the body and the housing due to heat, thereby reducing the thickness of the rotary surface mount resistive sensor, saving space, and facilitating user installation and placement. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the top cover, rotor and body of the rotary patch resistive sensor provided by this utility model;

[0020] Figure 2 This is an exploded view of the rotating patch resistive sensor provided by this utility model;

[0021] Figure 3 This is a schematic diagram of the rotor structure of the rotary patch resistive sensor provided by this utility model;

[0022] Figure 4 This is a schematic diagram of the terminals and carbon sheet of the rotary patch resistive sensor provided by this utility model;

[0023] Figure 5 This is a schematic diagram of the structure of the terminals and carbon sheet encapsulated in plastic on the body of the rotary patch resistive sensor provided by this utility model;

[0024] Figure 6 This is a first-view structural diagram of the rotating patch resistive sensor provided by this utility model;

[0025] Figure 7 This is a second-view structural diagram of the rotating patch resistive sensor provided by this utility model.

[0026] In the picture:

[0027] 1. Rotor; 11. Shaft core; 111. Through hole; 112. First anti-rotation plane; 12. Brush;

[0028] 2. Carbon sheet; 21. Resistor; 22. Connecting hole; 23. Positioning hole;

[0029] 3. Terminal; 31. Connector; 32. Pin;

[0030] 4. Body; 41. Positioning pin;

[0031] 5. Top cover;

[0032] 6. Snap-fit ​​structure; 61. Snap-fit ​​piece; 611. Snap-fit ​​hole; 62. Snap-fit ​​block. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0034] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0037] Please refer to Figures 1-7 This embodiment provides a rotary patch resistive sensor, including: a rotor 1, a carbon sheet 2, terminals 3, a body 4, and a top cover 5. The rotor 1, carbon sheet 2, terminals 3, and body 4 are coaxially arranged. The carbon sheet 2 and terminals 3 are disposed in the body 4, and the pins 32 of terminals 3 extend out of the body 4. The rotor 1 includes a shaft core 11 and a brush 12. The shaft core 11 is used to connect to an external rotating shaft. The brush 12 is fixedly connected to the shaft core 11 and is disposed between the shaft core 11 and the carbon sheet 2. A resistor 21 is disposed on the side of the carbon sheet 2 near the brush 12. The brush 12 can contact the resistor 21 and rotate relative to the carbon sheet 2. The top cover 5 and body 4 are coaxially arranged and detachably connected. There is a receiving space between the top cover 5 and body 4, and the rotor 1, carbon sheet 2, and terminals 3 are embedded in the receiving space. Specifically, the carbon sheet 2 is silver-plated and treated with anti-sulfurization, and has good conductivity and wear resistance.

[0038] This configuration, with the top cover 5 detachably connected to the main body 4, ensures that after the rotary surface mount resistive sensor is SMT soldered, a large gap will not appear between the main body 4 and the outer shell due to heat. This reduces the thickness of the rotary surface mount resistive sensor, saves space, and facilitates user installation and placement. Specifically, in this embodiment, the thickness of the rotary surface mount resistive sensor is less than 2.5mm.

[0039] Meanwhile, the rotor 1, carbon sheet 2 and terminal 3 are embedded in the receiving space, and the pins 32 of the terminal 3 extend out of the body 4. By setting the body 4 with a flat contact surface, the problem of uneven pins 32 causing the inability to perform SMT soldering is avoided, thus ensuring the installation reliability of the rotating surface mount resistive sensor.

[0040] Alternatively, please refer to Figure 1 , Figure 2 and Figure 7 The rotary patch resistive sensor also features a snap-fit ​​structure 6. The snap-fit ​​structure 6 includes a snap-fit ​​piece 61 disposed on one of the outer peripheral surfaces of the upper cover 5 and the body 4, and a snap-fit ​​block 62 disposed on the other of the outer peripheral surfaces of the upper cover 5 and the body 4. The snap-fit ​​piece 61 has a snap-fit ​​hole 611, and the snap-fit ​​block 62 can snap into or disengage from the snap-fit ​​hole 611. Preferably, the snap-fit ​​piece 61 is an elastic piece. Through elastic deformation, the snap-fit ​​piece 61 allows the snap-fit ​​hole 611 to engage with or disengage from the snap-fit ​​block 62, allowing the upper cover 5 and the body 4 to be fixed without screws, adhesives, etc., reducing assembly time and improving assembly efficiency.

[0041] Preferably, the rotary patch resistive sensor further includes a plurality of snap-fit ​​structures 6 spaced apart. In this embodiment, the rotary patch resistive sensor includes six snap-fit ​​structures 6. This arrangement further improves the reliability of the connection between the upper cover 5 and the body 4.

[0042] Preferably, the shaft core 11 and the brush 12 are integrally formed. Specifically, the shaft core 11 and the brush 12 are injection molded into a single unit.

[0043] Specifically, the brush 12 has three first brush claws on one side and two second brush claws on the other side. Both the first and second brush claws are bent and have a certain height. The first brush claws are used to contact the resistor on the carbon sheet 2, and the second brush claws are used to contact the silver plating layer on the carbon sheet 2 so that the circuit is connected.

[0044] Alternatively, please refer to Figure 3 and Figure 6Along the axial direction of rotor 1, a through hole 111 is provided on the shaft core 11, through which an external rotating shaft can pass. The inner wall of the through hole 111 is provided with a first anti-rotation plane 112, which is used to fit against a second anti-rotation plane on the outer periphery of the external rotating shaft. Specifically, the through hole 111 is a "D"-shaped hole, and the through hole 111 cooperates with a rotating shaft having a "D"-shaped cross-section, so that when the rotating shaft rotates, the brush 12 can rotate synchronously with the rotating shaft. In other embodiments, the through hole 111 is polygonal, that is, the inner wall of the through hole 111 may also have multiple first anti-rotation planes 112, which are used to fit against multiple second anti-rotation planes on the outer periphery of the external rotating shaft in a one-to-one correspondence. For example, the through hole 111 can be triangular, rectangular, hexagonal, etc.

[0045] Alternatively, please refer to Figure 4 One of the carbon sheet 2 and the terminal 3 is provided with a plurality of connection holes 22 at intervals, and the other of the carbon sheet 2 and the terminal 3 is provided with a plurality of connectors 31 at intervals. The plurality of connectors 31 are riveted to the plurality of connection holes 22 in a corresponding manner. Specifically, the connectors 31 are tubes.

[0046] In this embodiment, the carbon sheet 2 is provided with three connecting holes 22 at intervals, and the terminal 3 is provided with three tubes at intervals. The three tubes are riveted to the three connecting holes 22 one by one.

[0047] Preferably, please refer to Figure 5 The riveted carbon fiber sheet 2 and terminal 3 are then encased in plastic within the body 4. Specifically, the body 4 is made of plastic, the carbon fiber sheet 2 is made of fiberglass board, and the terminal 3 is stamped from metal. The surface of the terminal 3 has a silver plating layer to ensure its conductivity. By encasing the carbon fiber sheet 2 and terminal 3 in plastic within the body 4, the pins 32 of the rotating surface-mount resistive sensor are positioned on a single plane, avoiding SMT soldering defects caused by uneven pins 32.

[0048] Further, please refer to Figure 4 The carbon sheet 2 is provided with a positioning hole 23, which is used to connect with the plastic coating mold. In this way, the positioning hole 23 ensures that the carbon sheet 2 can be accurately embedded in the plastic coating mold during plastic coating, and avoids the carbon sheet 2 from being misaligned with the plastic coating mold.

[0049] Alternatively, please refer to Figure 7 A positioning post 41 is provided on the side of the body 4 away from the terminal 3. The positioning post 41 is used to connect with the PCB board to be connected. With this configuration, the positioning post 41 first enters the corresponding positioning hole on the PCB board, which plays a role in pre-positioning and guides the terminal 3 to align with the pad or through hole 111, preventing the terminal 3 from being misaligned or misaligned, and facilitating the assembly of the rotating surface mount resistive sensor.

[0050] Optionally, the brush 12 is stamped from a copper alloy material. Preferably, the brush 12 is made of beryllium copper and heat-treated, which has good conductivity and high fatigue strength, extending the service life of the rotary patch resistive sensor. Specifically, in this embodiment, the service life of the rotary patch resistive sensor reaches more than 1 million cycles.

[0051] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A rotary patch resistive sensor, comprising: The rotor (1), carbon sheet (2), terminal (3), and body (4) are coaxially arranged. The rotor (1) includes a shaft (11) and a brush (12). The shaft (11) is used to connect with an external rotating shaft. The brush (12) is fixedly connected to the shaft (11). The brush (12) is disposed between the shaft (11) and the carbon sheet (2). A resistor (21) is disposed on the side of the carbon sheet (2) near the brush (12). The brush (12) can interact with the resistor (21). 21) Contacting and rotating relative to the carbon sheet (2), characterized in that the carbon sheet (2) and the terminal (3) are disposed in the body (4), and the pin (32) of the terminal (3) extends out of the body (4), the rotating patch resistive sensor further includes a top cover (5), the top cover (5) and the body (4) are coaxially disposed, and the top cover (5) and the body (4) are detachably connected, and there is a receiving space between the top cover (5) and the body (4), the rotor (1), the carbon sheet (2) and the terminal (3) are embedded in the receiving space.

2. The rotary patch resistive sensor according to claim 1, characterized in that, The rotating patch resistive sensor also has a snap-fit ​​structure (6), which includes a snap-fit ​​piece (61) disposed on one of the outer peripheral surface of the upper cover (5) and the outer peripheral surface of the body (4), and a snap-fit ​​block (62) disposed on the other of the outer peripheral surface of the upper cover (5) and the outer peripheral surface of the body (4). The snap-fit ​​piece (61) is provided with a snap-fit ​​hole (611), and the snap-fit ​​block (62) can snap into the snap-fit ​​hole (611) or disengage from the snap-fit ​​hole (611).

3. The rotary patch resistive sensor according to claim 2, characterized in that, The snap-fit ​​piece (61) is an elastic piece.

4. The rotary patch resistive sensor according to claim 2, characterized in that, The rotary patch resistive sensor also includes a plurality of the aforementioned snap-fit ​​structures (6) spaced apart.

5. The rotary patch resistive sensor according to claim 1, characterized in that, The shaft core (11) and the brush (12) are integrally formed.

6. The rotary patch resistive sensor according to claim 1, characterized in that, Along the axial direction of the rotor (1), the shaft core (11) is provided with a through hole (111), through which an external rotating shaft can pass. The inner wall of the through hole (111) is provided with a first anti-rotation plane (112), which is used to fit with a second anti-rotation plane on the outer periphery of the external rotating shaft.

7. The rotary patch resistive sensor according to claim 1, characterized in that, One of the carbon sheet (2) and the terminal (3) is provided with a plurality of connecting holes (22) spaced apart, and the other of the carbon sheet (2) and the terminal (3) is provided with a plurality of connectors (31) spaced apart, and the plurality of connectors (31) are riveted to the plurality of connecting holes (22) in a corresponding manner.

8. The rotary patch resistive sensor according to claim 7, characterized in that, The riveted carbon sheet (2) and the terminal (3) are encapsulated in plastic on the body (4).

9. The rotary patch resistive sensor according to claim 8, characterized in that, The carbon sheet (2) is provided with a positioning hole (23), which is used to connect with the plastic coating mold; And / or, a positioning post (41) is provided on the side of the body (4) away from the terminal (3), the positioning post (41) being used to connect to the PCB board to be connected.

10. The rotary patch resistive sensor according to any one of claims 1-9, characterized in that, The brush (12) is formed by stamping copper alloy material; And / or, the carbon sheet (2) is made of fiberglass board material.

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