Capacitive operating rods and electronic equipment

Abstract

To avoid the influence of external factors on detection results and improve detection accuracy. [Solution] The capacitive operating rod includes a rocking rod, a rocking arm structure, a base, a circuit board, and a processor. When the rocking rod rocks, the rotating part rotates relative to the base to drive the rocking arm structure to rotate. The rocking arm structure further includes a metal medium that rotates in sync with the rotating part. The circuit board and the metal medium are arranged opposite each other in the axial direction of the rotating part. The circuit board has a plurality of receiving plates. The metal medium and the receiving plates are arranged opposite each other. The opposing regions of the metal medium and the receiving plates are rotationally symmetric with respect to the axis of the rotating part. When the rocking arm structure rotates, the relative area between the metal medium and at least one receiving plate changes. The processor detects the rotation angle of the rocking rod based on the change in the capacitance signal of a capacitor composed of the receiving plates and the metal medium.

Description

Technical Field

[0001] The present invention relates to the technical field of operating rods, and particularly to a capacitive operating rod and an electronic device.

Background Art

[0002] As a general electronic module, operating rods are widely applied in production and life, such as push rods of medical devices, shift levers of vehicles, and game controllers. During use, it is necessary to detect the rotation angle of the operating rod by a sensor. Conventional detection methods use Hall sensors, carbon sensors, etc.

[0003] However, Hall sensors are susceptible to external magnetic interference and have the problem that the relationship between the signal and the distance is non-linear. And carbon sensors have problems such as contact wear and low detection accuracy.

Summary of the Invention

[0004] Embodiments of the present invention detect the rotation angle of an operating rod by forming a capacitor, and by changing the relative positional relationship of the transmitting electrode plate, receiving electrode plate, and metal medium that form the capacitor, even when the operating rod is tilted due to the influence of the external environment, an accurate linear detection result can be obtained. The purpose is to provide a capacitive operating rod and an electronic device.

[0005] To solve the above technical problems, an embodiment of the present invention includes a rocking rod, a rocking arm structure, a base, a circuit board, and a processor, wherein the rocking rod penetrates the rocking arm structure, the rocking arm structure rotates in conjunction with the rocking of the rocking rod, the rocking arm structure includes a rocking arm body that contacts the rocking rod, and a rotating part that extends along the rocking arm body in a direction away from the rocking arm body, and when the rocking rod rocks, the rotating part rotates relative to the base to drive the rocking arm structure to rotate, and the rocking arm structure rotates in synchronization with the rotating part. The present invention provides a capacitive operating rod comprising a metal medium, wherein the circuit board and the metal medium are arranged facing each other in the axial direction of the rotating part, a plurality of receiving plates are provided on the circuit board, the metal medium and the receiving plates are arranged facing each other, the opposing regions of the metal medium and the receiving plates are rotationally symmetric with respect to the axis of the rotating part, and when the oscillating arm structure rotates, the relative area of ​​the metal medium and at least one of the receiving plates changes, and the processor detects the rotation angle of the oscillating rod based on the change in the capacitance signal of a capacitor composed of the receiving plates and the metal medium.

[0006] Embodiments of the present invention further provide electronic equipment including the capacitive operating rod described above.

[0007] In this embodiment of the present invention, compared to the prior art, the rotation angle of the operating rod is detected by forming a capacitor with a metal medium added to the oscillating arm structure and a receiving plate on the circuit board, thereby avoiding the influence of external magnetic interference or component wear on the detection results. Furthermore, the metal medium and the receiving plate are provided facing each other, and the opposing regions of the metal medium and the receiving plate are rotationally symmetric with respect to the axis of the rotating part. As a result, when the operating rod is tilted due to the influence of the external environment, the influence of the tilt on the capacitance signal is canceled out by utilizing the mutual compensation between the capacitance signals of the capacitor formed by the receiving plate and the metal medium, thereby obtaining accurate detection results.

[0008] Furthermore, the metal medium includes a metal body and an extended portion connected to the metal body, and the circuit board is further provided with a transmitting electrode plate, the metal body and the transmitting electrode plate are provided facing each other, the extended portion and the receiving electrode plate are provided facing each other, and the opposing regions of the extended portion and the receiving electrode plate are rotationally symmetric with respect to the axis of the rotating portion.

[0009] Furthermore, the number of the extended portions is multiple, and the multiple extended portions extend in different directions along the metal body, are uniformly distributed around the metal body, and the distance between any two adjacent extended portions is the same.

[0010] Furthermore, the receiving plates are uniformly distributed around the transmitting plates, and the number of receiving plates is determined based on the number of extensions.

[0011] Furthermore, the receiving electrode plate includes a first receiving unit and a second receiving unit, the first receiving unit and the second receiving unit are arranged alternately around the transmitting electrode plate, the number of the first receiving units and the number of the second receiving units are the same, and both the number of the first receiving units and the number of the second receiving units are equal to the number of the extended portion.

[0012] Furthermore, the processor detects the rotation angle of the oscillating rod based on the sum of a first capacitance signal composed of the transmitting plate and the first receiving unit, and the sum of a second capacitance signal composed of the transmitting plate and the second receiving unit.

[0013] Furthermore, the circuit board includes a first surface and a second surface, the transmitting electrode plate and the receiving electrode plate are provided on the first surface, and the circuit board is further provided with a first pin of the transmitting electrode plate and a second pin of the receiving electrode plate, and the first pin and the second pin are both located on the first surface or the second surface, or the first pin and the second pin are located on different surfaces of the circuit board.

[0014] Furthermore, a first grounding member is provided between the transmitting plate and the receiving plate, and the transmitting plate, the receiving plate, and the first grounding member are not connected to each other.

[0015] Furthermore, the receiving electrode plate is provided on the outer circumference of the transmitting electrode plate, and a second grounding member is provided on the outer circumference of the receiving electrode plate, and the receiving electrode plate and the second grounding member are not connected to each other.

[0016] Furthermore, the number of the extended portions is three. [Brief explanation of the drawing]

[0017] One or more embodiments are illustrated by the corresponding drawings, and these illustrative descriptions are not limiting to the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements, and unless otherwise specified, the drawings are not limiting to proportions.

[0018] [Figure 1] This is a schematic diagram of the exploded structure of a capacitive operating rod according to an embodiment of the present invention. [Figure 2] This is a schematic diagram of the cross-sectional structure of a capacitive operating rod according to an embodiment of the present invention. [Figure 3] This is a schematic diagram of the capacitor structure of a capacitive operating rod according to an embodiment of the present invention. [Figure 4] This is a schematic diagram illustrating the capacitance principle of the capacitor structure of a capacitive operating rod according to an embodiment of the present invention. [Figure 5] This is a schematic diagram of another capacitor structure for a capacitive operating rod according to an embodiment of the present invention. [Figure 6] This is a schematic diagram illustrating the capacitance principle of another capacitor structure for a capacitive operating rod according to an embodiment of the present invention. [Figure 7] This is a schematic diagram showing the structure of the receiving electrode plate of a capacitive operating rod according to an embodiment of the present invention. [Figure 8] This is a schematic diagram showing the structure of the receiving plate and transmitting plate of a capacitive operating rod according to an embodiment of the present invention. [Figure 9] It is a schematic configuration diagram of a capacitor structure in a detection state of a capacitive operation rod according to an embodiment of the present invention. [Figure 10] It is a schematic diagram of an equivalent structure of a capacitor structure in a detection state of a capacitive operation rod according to an embodiment of the present invention. [Figure 11] It is a schematic diagram showing a change in a capacitance signal of a capacitive operation rod according to an embodiment of the present invention. [Figure 12] It is a schematic diagram showing a change in another capacitance signal of a capacitive operation rod according to an embodiment of the present invention. [Figure 13] It is a schematic configuration diagram of the first pin and the second pin of a circuit board of a capacitive operation rod according to an embodiment of the present invention. [Figure 14] It is a schematic perspective configuration diagram of a capacitive operation rod according to an embodiment of the present invention.

Embodiments for Carrying Out the Invention

[0019] In order to make the objects, technical means, and advantages of the embodiments of the present invention clearer, each embodiment of the present invention will be described in detail below with reference to the drawings. A person skilled in the art can understand that in each embodiment of the present invention, many technical details are provided for the reader to better understand the present invention; however, even without these technical details and various changes and modifications based on the following embodiments, the technical means for seeking the protection of the present invention can be realized.

[0020] The classification of the following embodiments is for the convenience of explanation and should not constitute any limitation to the specific implementation manner of the present invention. Each embodiment can be cited in combination with each other as long as there is no contradiction.

[0021] Embodiments of the present invention relate to a capacitive operating rod, where Figure 1 is an exploded view of the capacitive operating rod and Figure 2 is a cross-sectional view of the capacitive operating rod. As shown in Figures 1 and 2, the operating rod includes a base 1, a rocking rod 2, a rocking arm structure 3, and a housing 8. The base 1 and housing 8 together constitute the external structure of the operating rod, and the rocking rod 2 and rocking arm structure 3 work together to change the angle of the rocking rod. Since the rocking rod needs to rotate in at least two directions, the rocking arm structure typically includes an upper rocking arm 31 and a lower rocking arm 32, the upper rocking arm 31 and the lower rocking arm 32 being fixed to the rocking rod by an axle pin 21, which drives the upper rocking arm 31 to rotate when the rocking rod 2 rotates in a first direction, and a first rotation axis 311 is provided at the end of the upper rocking arm 31, the first rotation axis 311 being rotatably fixed to the base 1 and housing 8. Similarly, the lower oscillating arm 32 is driven to rotate when the oscillating rod 2 rotates in the second direction, and a second pivot shaft 321 is provided at the end of the lower oscillating arm 32, which is rotatably fixed to the base 1 and housing 8. The first and second directions are perpendicular to each other, and the first and second pivot shafts together constitute the rotating part of the operating rod, enabling the operating rod to rotate in any direction. To ensure the rotational flexibility of the oscillating rod 2, a sliding disc 22 is provided in the direction of the oscillating rod 2 closest to the base 1.

[0022] The operating rod can provide a button function in addition to a rotation control function. A button 24 is provided on the base 1, and the position of the button 24 corresponds to the position of the lower oscillating arm 32. A spring 23 is provided in the direction of the oscillating rod 2 toward the base 1, and when a pressing force is applied to the oscillating rod 2 toward the base 1, the oscillating rod 2 compresses the spring 23 and moves toward the base 1, driving the oscillating arm structure 3 to move toward the base 1, a portion of the lower oscillating arm 32 comes into contact with the button 24, and the button 24 is triggered.

[0023] Furthermore, the operating rod is further equipped with a circuit board. Specifically, the upper swing arm 31 is equipped with a corresponding first circuit board 51, and the lower swing arm 32 is equipped with a corresponding second circuit board 52. To protect the circuit boards from damage caused by the external environment, a first protective cover 71 is attached to the first circuit board 51. The first protective cover 71 covers the outside of the first circuit board 51 and also serves to fix the first circuit board 51 in place. The second circuit board 52 is fitted into the second protective cover 72, and the second protective cover 72 covers the outside of the second circuit board 52.

[0024] The overall structure of the capacitive operating rod is as described above, and an embodiment of the present invention provides a solution for detecting the rotation angle of the oscillating rod 2 by configuring a capacitor based on this, specifically the capacitive operating rod includes the oscillating rod 2, the oscillating arm structure 3, the base 1, the circuit board and the processor, the oscillating rod 2 passes through the oscillating arm structure 3, the oscillating arm structure 3 rotates in conjunction with the oscillating rod 2, the oscillating arm structure 3 includes an oscillating arm body that contacts the oscillating rod 2 and a rotating part that extends along the oscillating arm body in a direction away from the oscillating arm body, and when the oscillating rod oscillates, the rotating part rotates relative to the base 1 and drives the oscillating arm structure 3 to rotate. The oscillating arm structure 3 further includes a metal medium that rotates in sync with the rotating part, the circuit board and the metal medium are arranged facing each other in the axial direction of the rotating part, a plurality of receiving plates are provided on the circuit board, the metal medium and the receiving plates are arranged facing each other, the opposing region of the metal medium and the receiving plates is rotationally symmetric with respect to the axis of the rotating part, and when the oscillating arm structure rotates, the relative area of ​​the metal medium and at least one receiving plate changes, and the processor detects the rotation angle of the oscillating rod based on the change in the capacitance signal of a capacitor composed of the receiving plate and the metal medium.

[0025] For example, when the oscillating rod 2 rotates in a first direction to drive the upper oscillating arm 31, a coaxially rotating first metal plate 41 is provided at the position of the first rotation axis 311 of the upper oscillating arm 31. The first metal plate 41 and the first circuit board 51 are positioned opposite each other. When the upper oscillating arm 31 rotates, the relative area between the first metal plate 41 and at least one receiving plate provided on the first circuit board 51 changes. This changes the capacitance signal of the capacitor formed by the receiving plate and the first metal plate 41, thereby enabling detection of the rotation angle of the oscillating rod 2 in the first direction. Similarly, when the oscillating rod 2 rotates in a second direction to drive the lower oscillating arm 32, a coaxially rotating second metal plate 42 is provided at the position of the second rotation axis 321 of the lower oscillating arm 32. This forms a capacitor with the receiving plate provided on the second circuit board 52, causing a synchronous change in the capacitance signal and enabling detection of the rotation angle of the oscillating rod 2 in the second direction. The first metal plate 41 and the second metal plate 42 described above are both metallic media constituting a capacitor, and the upper oscillating arm 31 and the lower oscillating arm 32 are oscillating arm structures that rotate in different directions. The metallic media may be fixed to the rotating part by a support structure, and as shown in Figure 1, the first metal plate 41 is provided on the first support member 61 and the second metal plate 42 is provided on the second support member 62, and the shape of the support structure and the shape of the metallic media are matched to prevent the support structure from affecting the signal of the receiving plate. The metallic media may be mounted on the surface of the support structure by laser-direct-structuring (LDS) technology. Patterns for the corresponding receiving plate or transmitting plate may be formed on the circuit board by laser-direct-structuring (LDS) technology.

[0026] Furthermore, when the oscillating rod 2 is tilted, the distance between the metal medium and the different receiving plates changes from a state where they are exactly the same to a state where the distance between the metal medium and some of the receiving plates decreases, and the distance between the metal medium and the remaining receiving plates increases. In the embodiment of the present invention, the opposing regions of the metal medium and the receiving plates are rotationally symmetric with respect to the axis of the rotating part. Therefore, by comprehensively considering the capacitance signals generated between the metal medium and all the receiving plates, the influence of the tilt of the oscillating rod on the capacitance signals is offset, and the accuracy of rotation angle detection is improved. The specific principle of solving the tilt problem by comprehensively considering the capacitance signals generated between the metal medium and all the receiving plates will be explained in detail in the following description.

[0027] In this embodiment of the present invention, compared to the prior art, the rotation angle of the operating rod is detected by forming a capacitor with a metal medium added to the oscillating arm structure and a receiving plate on the circuit board, thereby avoiding the influence of external magnetic interference or component wear on the detection results. Furthermore, the metal medium and the receiving plate are provided facing each other, and the opposing regions of the metal medium and the receiving plate are rotationally symmetric with respect to the axis of the rotating part. As a result, when the operating rod is tilted due to the influence of the external environment, the influence of the tilt on the capacitance signal is canceled out by utilizing the mutual compensation between the capacitance signals of the capacitor formed by the receiving plate and the metal medium, thereby obtaining accurate detection results.

[0028] The capacitor structure configuration methods in the embodiments of the present invention include the following two types.

[0029] Taking a detection capacitor structure in which the oscillating rod 2 rotates in a first direction as an example, one type of capacitor structure configuration is as shown in Figure 3, in which only the receiving plate 511 is provided on the first circuit board 51, and the first metal plate functions as the transmitting plate, forming a capacitor with the receiving plate 511. As shown in Figure 4, in the formation principle of the capacitor structure, the first metal plate functions as the transmitting plate Tx, and the electric field is radiated from the transmitting plate Tx to the receiving plate Rx.

[0030] As shown in Figure 5, in the configuration of other types of capacitor structures, the first circuit board 51 is provided with a transmitting plate 512 and a receiving plate 511, the metallic medium includes a metal body and an extended portion connected to the metal body, the metal body and the transmitting plate are provided opposite each other, the extended portion and the receiving plate are provided opposite each other, and the opposing regions of the extended portion and the receiving plate are rotationally symmetric with respect to the axis of the rotating portion. Referring to Figure 5, the first metal plate 41 includes a metal body 411 and an extended portion 412. In this case, as shown in Figure 6, in the formation principle of the capacitor structure, the electric field lines are radiated from the transmitting plate Tx to the first metal plate 41, pass through the first metal plate and then return to the receiving plate Rx.

[0031] The two types of capacitor structures described above can both be understood as having a metal medium that includes two parts: a metal body and an extension connected to the metal body. When only a receiving plate is provided on the circuit board, the metal medium functions as a transmitting plate, and the metal body, provided in correspondence with the circuit board, functions as a connection structure for multiple extensions, while also ensuring that the charge amounts of the multiple extensions are the same. In this case, if circuit pins are placed on the metal medium, circuit connection of multiple extensions can be achieved, reducing wiring costs.

[0032] The number of extensions is multiple, and these extensions extend in different directions along the metal body, are uniformly distributed around the metal body, and the distance between any two adjacent extensions is the same. For example, if there are three extensions, the three extensions are distributed around the metal body like fan blades, the angle between two adjacent extensions is 120 degrees, and when there are three extensions, the rotational symmetry angle of the rotating part of the metal medium with respect to the axis is 120 degrees, that is, the state after the metal medium has rotated 120 degrees is the same as the state before rotation. The number of extensions can be determined based on the rotation range of the oscillating rod, and if the required rotation range of the oscillating rod is small, the tilt prevention performance of the operating rod can be improved by increasing the number of extensions and corresponding receiving plates. If it is necessary to expand the rotation detection range of the oscillating rod, the number of extensions can be appropriately reduced.

[0033] The constructed capacitor structure can be considered approximately as a circular structure, and when it rotates with the oscillating rod, the area change of the metal medium and the receiving plate is the same when rotating at the same angle, and as a result, the detection result shows excellent linear change.

[0034] The receiving plates are uniformly distributed around the transmitting plates, and the number of receiving plates is determined based on the number of extensions. For example, if there are three extensions, there can be six receiving plates, meaning the number of receiving plates is twice the number of extensions.

[0035] Furthermore, the receiving plate includes a first receiving unit and a second receiving unit, which are alternately arranged around the transmitting plate. The number of first receiving units and the number of second receiving units are the same, and both the number of first receiving units and the number of second receiving units are equal to the number of extensions. As shown in Figure 7, when there are three extensions and only the receiving plate is provided on the circuit board, the first receiving unit Rx1 and the second receiving unit Rx2 are arranged alternately. As shown in Figure 8, when there are three extensions and both the transmitting plate and the receiving plate are provided on the circuit board, the first receiving unit Rx1 and the second receiving unit Rx2 are arranged alternately and also on the outer circumference of the transmitting plate Tx. Alternatively, the transmitting plate Tx may be provided on the outer ring, and the alternately arranged first receiving unit Rx1 and second receiving unit Rx2 may be provided on the inner ring. To avoid electric field interference between the transmitting and receiving plates, a first grounding member GND is provided between the transmitting and receiving plates (a combination of the first receiving unit Rx1 and the second receiving unit Rx2), and the transmitting plate, receiving plate, and first grounding member are not connected to each other. When the receiving plate is located on the outer circumference of the transmitting plate, a second grounding member GND' is provided on the outer circumference of the receiving plate, and the receiving plate and the second grounding member are not connected to each other. When the transmitting plate is located on the outer circumference of the receiving plate, the second grounding member is provided on the outer circumference of the transmitting plate, and its purpose is to reduce electric field interference of the outer ring plates due to the external environment.

[0036] Furthermore, by providing multiple receiving plates, the signal amount of the capacitor structure can be increased, resulting in a larger change in the signal for the same rotation angle, and thus improving the angle detection sensitivity.

[0037] The following describes in detail the changes in the capacitance signal formed when the transmitting plate, receiving plate, and first metal plate jointly constitute a capacitor structure in an embodiment of the present invention. As shown in Figure 9, the first metal plate rotates clockwise, and one extended portion has an area that directly faces one first receiving unit Rx1 and one second receiving unit Rx2 of the receiving plate, respectively. The relative positional relationship of the transmitting plate, receiving plate, and first metal plate is simplified to the equivalent structure shown in Figure 10. When the first metal plate rotates clockwise, the change in the relative position of one extended portion and one first receiving unit Rx1 and one second receiving unit Rx2 is equivalent to the change in the relative position of the first metal plate and the transmitting plate Tx, the first receiving unit Rx1 and the second receiving unit Rx2 when they move parallel in the left-right direction as shown in Figure 10. When the first metal plate moves from left to right as shown in Figure 10, the change in the capacitance signal C1 formed between the transmitting plate Tx and the first receiving unit Rx1 is as shown in Figure 11; that is, when rotating clockwise, the angle increases, and C1 increases accordingly. As C1 changes, the change in the capacitance signal C2 formed between the transmitting plate Tx and the second receiving unit Rx2 is as shown in Figure 12; that is, when rotating clockwise, the angle increases, and C2 decreases accordingly.

[0038] The rules governing the change in capacitance formed by other extensions also conform to the above rules. For example, if three extensions are provided when the metal medium is tilted, the distance between one extension and the receiving plate decreases, and the distance between the other two extensions and the receiving plate increases, compared to when it is not tilted. Alternatively, the distance between one extension and the receiving plate increases, and the distance between the other two extensions and the receiving plate decreases. By detecting the rotation angle of the oscillating rod based on the sum of all capacitances formed by the extensions and the receiving plate, the effect of tilt on the capacitance signal can be offset, and the change in the capacitance signal due to the tilt of the metal medium can be minimized. When the receiving plate includes a first receiving unit and a second receiving unit, the rotation angle of the oscillating rod is detected based on the sum of the first capacitance signals formed by the transmitting plate and the first receiving unit, and the sum of the second capacitance signals formed by the transmitting plate and the second receiving unit. That is, the first capacitance signal formed by the first receiving unit is added, the second capacitance signal formed by the second receiving unit is added, and the first capacitance signal and the second capacitance signal are not processed.

[0039] Furthermore, the circuit board includes a first surface and a second surface. When a transmitting plate and a receiving plate are provided on the circuit board, the transmitting plate and the receiving plate are provided on the first surface. The circuit board is further provided with a first pin for the transmitting plate and a second pin for the receiving plate. As shown in Figure 13, the first pin (pin1) and the second pin (pin2) are both located on the second surface, or both the first pin (pin1) and the second pin (pin2) are located on the first surface, or the first and second pins are located on different surfaces of the circuit board. The number of second pins is determined based on the number of receiving plates. When a first grounding member and a second grounding member are provided on the circuit board, corresponding pins for the grounding members are also provided. The order of each pin can be flexibly adjusted based on the wiring configuration.

[0040] Finally, a perspective view of the assembled capacitive operating rod is shown in Figure 14, where the oscillating rod 2 protrudes from the housing 8 to facilitate user operation of the oscillating rod. The pins of the first circuit board 51 are exposed outside the first protective cover 71 for easy electrical connection. The base 1 is provided with a housing area for the button 24, the trigger position of which contacts a portion of the lower oscillating arm, and the button 24 is located below the contact area of ​​the lower oscillating arm.

[0041] Another implementable embodiment of the present invention relates to an electronic device including the capacitive operating rod described above. The electronic device may be a game controller, keyboard, medical device, drone, or the like. The capacitive operating rod acts as an input device to control the electronic device to execute corresponding control commands.

[0042] Compared to related technologies, the electronic device according to the embodiment of the present invention is provided with the capacitive operating rod according to the above embodiment, and therefore similarly has the technical effects of the above embodiment, which will not be explained here.

[0043] Those skilled in the art will understand that the above embodiments are specific examples for realizing the present invention, and that in actual applications, various modifications can be made to the form and details without departing from the spirit and scope of the invention.

Claims

1. Includes a rocking rod, rocking arm structure, base, housing, circuit board and processor, The housing chamber surrounded by the base and the housing houses a part of the swing rod and a part of the swing arm structure. The oscillating rod passes through the oscillating arm structure, and the oscillating arm structure rotates in conjunction with the oscillating rod. The rocking arm structure includes a rotating part rotatably provided between the base and the housing, and a metal medium that rotates synchronously with the rotating part, and when the rocking rod rocks, the rotating part rotates relative to the base and drives the rocking arm structure to rotate. The circuit board and the metal medium, which are fixed to the outside of the housing, are arranged facing each other in the axial direction of the rotating part, and a plurality of receiving plates are provided on the circuit board. The metal medium and the receiving electrode plate are provided facing each other, and the opposing regions of the metal medium and the receiving electrode plate are rotationally symmetric with respect to the axis of the rotating part, and when the rocking arm structure rotates, the relative area between the metal medium and at least one of the receiving electrode plates changes. The processor detects the rotation angle of the oscillating rod based on the change in the capacitance signal of the capacitor composed of the receiving plate and the metal medium. An electrocapacitive operating rod characterized by the following features.

2. The metal medium includes a metal body and an extended portion connected to the metal body, and the circuit board is further provided with a transmitting electrode plate. The metal body and the transmitting electrode plate are provided facing each other, the extended portion and the receiving electrode plate are provided facing each other, and the opposing regions of the extended portion and the receiving electrode plate are rotationally symmetric with respect to the axis of the rotating portion. The electrocapacitive operating rod according to feature 1.

3. The number of the extended portions is multiple, and the multiple extended portions extend in different directions along the metal body and are uniformly distributed around the metal body. The distance between any two adjacent extensions is the same. The electrocapacitive operating rod according to feature 2.

4. The receiving plates are uniformly distributed around the transmitting plates, The number of receiving plates is determined based on the number of extensions. The electrocapacitive operating rod according to feature 3.

5. The receiving electrode plate includes a first receiving unit and a second receiving unit. The first receiving unit and the second receiving unit are arranged alternately around the transmitting electrode plate, The number of the first receiving units and the number of the second receiving units are the same. The number of the first receiving units and the number of the second receiving units are both equal to the number of the extensions. The electrocapacitive operating rod according to feature 4.

6. The processor detects the rotation angle of the oscillating rod based on the sum of a first capacitance signal composed of the transmitting plate and the first receiving unit and the sum of a second capacitance signal composed of the transmitting plate and the second receiving unit. The electrocapacitive operating rod according to feature 5.

7. The circuit board includes a first surface and a second surface, and the transmitting electrode plate and the receiving electrode plate are provided on the first surface. The circuit board is further provided with a first pin of the transmitting plate and a second pin of the receiving plate. The first pin and the second pin are both located on the first surface or the second surface, or the first pin and the second pin are located on different surfaces of the circuit board. The electrocapacitive operating rod according to feature 2.

8. A first grounding member is provided between the transmitting plate and the receiving plate. The transmitting plate, the receiving plate, and the first grounding member are not connected to each other. The electrocapacitive operating rod according to feature 2.

9. The number of the aforementioned extensions is three. The electrocapacitive operating rod according to feature 2.

10. Includes an electrocapacitive operating rod according to any one of claims 1 to 9, An electronic device characterized by the following features.

Images