A non-contact capacitive sensor

Abstract

The application is suitable for the technical field of capacitors, and provides a non-contact capacitive sensor, which comprises a shell body treated by an electroplating process, a connecting plate arranged in the inner cavity of the shell body, and a mounting plate arranged on one side of the connecting plate. The non-contact capacitive sensor forms parasitic capacitances between the byte sheet and the surface of the shell body and between the noise reduction terminal wire and the shell body respectively. After the newly added electrostatic capacitance is generated by a finger, the electrostatic capacity and the count value gradually increase. The detected signal is sent to the circuit mainboard, the signal is processed by the circuit mainboard to make the lamp plate, and the switch lamp plate is turned on and brightened. During use, the noise reduction terminal wire can detect and reduce electromagnetic interference at the same time, the shielding electrode plays a shielding interference role of the circuit mainboard, the small capacitive change between the human body and the product is detected, the detection is quickly performed, touch pressing is not needed, the surface of the button is prevented from being polluted and the hygiene problem is avoided, the detection area is large, the error probability is small, and the use effect is good.

Description

Technical Field

[0001] This invention belongs to the field of capacitor technology, and particularly relates to a non-contact capacitive sensor. Background Technology

[0002] Capacitive sensors are devices that use various types of capacitors as sensing elements to convert the measured physical or mechanical quantities into changes in capacitance. In essence, they are capacitors with variable parameters. In applications using capacitive technology, the sensitivity of capacitive proximity switches depends on the material properties of the target object. Capacitive sensors have the following advantages, such as good temperature stability, good dynamic response, and ease of manufacturing.

[0003] Capacitive sensors are also frequently used as position signal generators in automatic detection and control systems. Their applications are quite broad, including switch control, automation control, aerospace, automotive manufacturing, and other industrial fields. In the current application of elevator switch control, elevator buttons are composed of springs and microswitches. They require a certain amount of travel before they can be used. When in use, the corresponding button needs to be pressed to control the elevator.

[0004] However, existing capacitive sensors mainly require human touch and finger pressing to send control signals for feedback and output. However, the surface of the finger is easily contaminated, and the pressing mechanism has a limited lifespan and cannot be used for a long time. While infrared technology can achieve non-contact control feedback and output, it meets the non-contact requirement, but it is prone to errors and the infrared detection area is small, making it susceptible to radiation and electromagnetic interference. Summary of the Invention

[0005] This invention provides a non-contact capacitive sensor, which aims to solve the problems of non-contact sensors being easily interfered with, prone to errors, and having a small infrared detection area.

[0006] This invention is implemented as follows: a non-contact capacitive sensor includes a housing body whose surface is treated with an electroplating process.

[0007] A connecting plate disposed in the inner cavity of the outer shell body, a mounting plate disposed on one side of the connecting plate, a positioning plate disposed in the inner cavity of the mounting plate for auxiliary positioning, and a byte chip disposed in the inner cavity of the mounting plate for receiving human body charge.

[0008] A circuit board located in the inner cavity of the outer casing for receiving and processing transmitted signals; a lamp board located on one side of the circuit board; and shielding electrodes located on the lamp board for shielding interference from electronic components.

[0009] A noise reduction terminal line is provided on the circuit board to reduce electromagnetic interference, and one end of the noise reduction terminal line passes through the connecting plate and is coiled and disposed in the inner cavity of the mounting plate. A connection terminal line is provided on the circuit board, and one end of the connection terminal line passes through the connecting plate and the mounting plate and is connected to the surface of the byte chip.

[0010] Preferably, the surface of the positioning plate is provided with a positioning piece, and the surface of the byte piece is provided with a shape groove adapted to the positioning piece.

[0011] Preferably, the inner side of the byte chip is provided with a terminal block, and the surface of the positioning plate is provided with a connection port adapted to the terminal block, and the terminal block is fixedly connected to one end of the connection terminal wire.

[0012] Preferably, the rear side of the outer shell body is provided with a protective mechanism for sealing and protecting the rear side of the outer shell body. The protective mechanism includes a protective plate provided on the rear side of the outer shell body for sealing the rear side of the outer shell body. A fixing rod is threadedly connected to the top and bottom of one side of the protective plate and is horizontally extended. The fixing rod is threadedly connected to the surface of the outer shell body.

[0013] Preferably, the top and bottom of the rear side of the outer shell body are both recessed inward and provided with threaded grooves, and the two threaded grooves correspond one-to-one with the two fixing rods. The inner wall surface of the threaded groove is provided with threads that are adapted to the surface of the fixing rod.

[0014] Preferably, the top and bottom of the inner wall of the outer casing are provided with positioning blocks for positioning the circuit board, and the positioning blocks are made of non-metallic material.

[0015] Preferably, a positioning rod is vertically threaded through the top of the mounting plate, and a limiting rod is horizontally provided on the top of the inner side of the byte chip. The surface of the limiting rod is provided with a threaded groove that matches the positioning rod.

[0016] Preferably, the top of the positioning plate surface has a through-hole adapted to the limiting rod.

[0017] Preferably, both ends of the outer shell body surface are provided with connecting posts for connection. Beneficial effects

[0018] Compared with the prior art, the beneficial effects of the present invention are: a non-contact capacitive sensor of the present invention:

[0019] (1) After the device is installed, parasitic capacitances are formed between the chip and the surface of the outer shell and between the noise reduction terminal wire and the outer shell. After the finger generates additional electrostatic capacitance, the electrostatic capacitance and count value gradually increase. The detected signal is sent to the main circuit board. The main circuit board processes the signal to make the lamp board light up when the switch is turned on. When in use, the noise reduction terminal wire can detect and reduce electromagnetic interference at the same time. The shielding electrode plays the role of shielding the interference of the main circuit board. It detects the small capacitance changes between the human body and the product, and performs detection quickly without touch pressing, avoiding contamination of the button surface and hygiene issues. It has a large detection area, low error probability, extremely low radiation and electromagnetic interference, and good performance.

[0020] (2) After the device is installed, it is installed on the back of the outer shell to block and protect the back of the outer shell. The fixing rod is rotated to connect with the corresponding threaded groove, thereby completing the fixed connection. This avoids the back of the outer shell from being exposed to the external environment. At the same time, the material of the fixing rod will not affect the product during use, resulting in good performance. Attached Figure Description

[0021] Figure 1 This is a side view of the structure of the present invention;

[0022] Figure 2 This is a front view schematic diagram of the structure in this invention;

[0023] Figure 3 This is a front view schematic diagram of the positioning plate and positioning piece structure in this invention;

[0024] Figure 4 For the present invention Figure 1 Enlarged schematic diagram of the structure at point A in the middle;

[0025] Figure 5 For the present invention Figure 1 Enlarged schematic diagram of the structure at point B.

[0026] In the diagram: 1. Outer shell; 2. Connecting plate; 3. Mounting plate; 4. Byte chip; 5. Positioning plate; 6. Positioning piece; 7. Circuit board; 8. Lamp board; 9. Shielding electrode; 10. Protective plate; 11. Connecting terminal wire; 12. Terminal block; 13. Connecting post; 14. Connecting port; 15. Through-hole; 16. Noise reduction terminal wire; 17. Positioning rod; 18. Limiting rod; 19. Positioning block; 20. Fixing rod. Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0028] Please see Figure 1-5 The present invention provides a technical solution: a non-contact capacitive sensor, comprising a housing body 1 whose surface is treated by electroplating; a connecting plate 2 disposed in the inner cavity of the housing body 1; a mounting plate 3 disposed on one side of the connecting plate 2; a positioning plate 5 disposed in the inner cavity of the mounting plate 3 for auxiliary positioning; and a byte chip 4 disposed in the inner cavity of the mounting plate 3 for receiving human body charge.

[0029] Capacitive sensors use various types of capacitors as sensing elements to convert the measured physical or mechanical quantity into a change in capacitance. In essence, it is a capacitor with variable parameters. In applications using capacitive technology, the sensitivity of a capacitive proximity switch depends on the material properties of the target object. Capacitive sensors have advantages such as good temperature stability, good dynamic response, and ease of manufacturing. Their application fields are relatively wide, including switch control, automation control, aerospace, automotive manufacturing, and other industrial fields.

[0030] In the current application of elevator switch control, elevator buttons are composed of springs and microswitches. They require a certain pressing stroke to continue to be used. When in use, the corresponding button needs to be pressed to control it.

[0031] Chinese patent CN100370402C, entitled "Touch Sensing Device," explicitly states that when a human body presses or touches the sensor, the sensor provides feedback and transmits the information to the terminal circuit for processing, thus achieving the corresponding expected function. This invention achieves this without requiring contact with the sensor. It detects and transmits the minute capacitance change between the human body and the invention when the finger is within 2-3 centimeters of the detection distance, thereby controlling the switch. Furthermore, traditional capacitive sensors have higher levels of radiation and electromagnetic interference.

[0032] Chinese patent with publication number "CN207218660U" is entitled "Button-type Human Infrared Sensor Switch". It uses human infrared sensing and adds touch button function on the basis of sensing. However, in actual use, the range of infrared sensing is small and the error probability is high, which cannot achieve the corresponding use effect. When the infrared sensing cannot detect the human body due to error, the user still needs to press the touch button to use it, resulting in poor use effect.

[0033] In the elevator industry, traditional buttons are generally controlled by human fingers pressing them. However, traditional pressing has the following disadvantages: First, it is prone to mechanical pressing failure; second, the mechanical pressing has a limited lifespan; and third, manual contact pressing can easily contaminate the button surface, and the contaminants corrode the button surface, shortening its service life and causing certain hygiene problems.

[0034] The specific material of the outer shell 1 is not limited, but its surface needs to be plated with a metal coating through an electroplating process. The electroplating process serves to prevent corrosion, improve wear resistance, conductivity, reflectivity and enhance aesthetics. The electroplating process on the surface of the outer shell 1 forms a conductive layer on its outer metal coating to ground it, preventing external interference with internal detection and data transmission, and ensuring its performance.

[0035] Both the connecting plate 2 and the mounting plate 3 are made of acrylic. Acrylic has the characteristics of good plasticity, good light transmission, excellent weather resistance, and long service life. In particular, the light transmission is excellent because when the product detects the tiny capacitance of the human body, the light will illuminate to remind the user. Since the light transmission of acrylic reaches more than 92%, it ensures that the light can pass through to remind the user. At the same time, if ordinary glass is used to ensure light transmission, acrylic has the longest service life and the impact resistance is 16 times that of ordinary glass.

[0036] The connecting plate 2 is located inside the outer shell 1, and the mounting plate 3 is located outside the outer shell 1. The mounting plate 3 is fixedly connected to one side of the connecting plate 2, i.e., the outer side, so as to ensure that the mounting plate 3 is in the designated position. At the same time, the material of the positioning plate 5 is just enough to ensure that it will not interfere with the transmission and reception of signals. It is simply used to ensure the normal installation and positioning of the byte chip 4. The byte chip 4 is made of metal, specifically stainless steel, which ensures its service life. After the byte chip 4 is installed, it is located inside the inner cavity of the mounting plate 3. The front side of the inner cavity of the mounting plate 3 is open, so as to ensure the normal installation of the byte chip 4 and the positioning plate 5. The positioning plate 5 can be installed and fixed in the inner cavity of the mounting plate 3 according to specific usage requirements.

[0037] The byte chip 4 is made of stainless steel, which ensures that when connected by wires, a metal coating formed by electroplating on the surface of the outer casing 1 can be used to detect tiny parasitic capacitances in the human body. After detecting tiny parasitic capacitances in the human body, the signal is transmitted to a designated location for processing. The user does not need to directly touch the byte chip 4, similar to a traditional button press, to perform the corresponding operation, making it more convenient to use.

[0038] A circuit board 7 is located inside the outer shell 1 for receiving and processing transmitted signals; a lamp board 8 is located on one side of the circuit board 7; and a shielding electrode 9 is located on the lamp board 8 for shielding interference from electronic components.

[0039] The main circuit board 7 is a mature existing structure, so it will not be explained in detail. It is equipped with a CT1000 measurement chip and capacitors for processing and transmitting signals. The capacitors transmit the signals to the measurement chip for processing and analysis. When the measurement chip detects the corresponding data, it controls the lamp board 8 to light up or turn off.

[0040] The shielding electrode 9 has the same shape and size as the byte chip 4 and the positioning plate 5. The model of the shielding electrode 9 is not specifically limited. Its main function is to prevent the electronic components set on the circuit board 7 from interfering with the byte chip 4, so as to ensure its normal use and measurement accuracy.

[0041] A noise reduction terminal line 16 is provided on the circuit main board 7 to reduce electromagnetic interference. One end of the noise reduction terminal line 16 passes through the connecting plate 2 and is coiled and located in the inner cavity of the mounting plate 3. A connection terminal line 11 is provided on the circuit main board 7. One end of the connection terminal line 11 passes through the connecting plate 2 and the mounting plate 3 and is connected to the surface of the byte chip 4.

[0042] The inner cavity of the mounting plate 3 is provided with a mounting groove for mounting the coiled noise reduction terminal wire 16. The depth of the mounting groove is 1mm for inserting the wire. At the same time, the size of the mounting groove is slightly smaller than the size of the byte chip 4. One end of the noise reduction terminal wire 16 passes through the connecting plate 2 and is installed in a coiled shape through the mounting groove. The other end is connected to the connector provided on the surface of the circuit main board 7, so as to achieve noise reduction while ensuring the effect of subsequent use.

[0043] One end of the connecting terminal wire 11 passes through the connecting plate 2 and the mounting plate 3 respectively and is connected to the surface of the byte chip 4 to ensure subsequent use. At the same time, both the noise reduction terminal wire 16 and the connecting terminal wire 11 are 1.25 pitch 2P single-ended terminal wires to ensure subsequent use. One end of the connecting terminal wire 11 can be fixedly connected to the surface of the byte chip 4 by soldering, and the fixing method is not specifically limited.

[0044] Furthermore, the surface of the positioning plate 5 is provided with a positioning piece 6, and the surface of the byte piece 4 is provided with a shaped groove that matches the positioning piece 6.

[0045] The positioning plate 5 is fixedly connected to the inner wall of the mounting plate 3. The shape of the positioning piece 6 is as shown in the attached diagram of the instruction manual. Figure 2 As shown, the shape and size of the byte chip 4 are adapted to the positioning piece 6, thereby ensuring that the byte chip 4 is properly installed on the surface of the positioning plate 5. At the same time, the positioning piece 6 is inserted into the inner cavity of the shape groove to ensure quick installation and positioning.

[0046] Furthermore, the inner side of the byte chip 4 is provided with a terminal block 12, and the surface of the positioning plate 5 is provided with a connection port 14 that is compatible with the terminal block 12. The terminal block 12 is fixedly connected to one end of the connection terminal wire 11.

[0047] In this embodiment, the terminal block 12 is fixedly connected to the bottom of the inner side of the byte chip 4. The fixed connection method is not specifically limited. It can be fixedly connected by welding. The end of the terminal block 12 connected to the connecting terminal wire 11 is fixedly connected, which can also be fixedly connected by soldering. The section of the connecting terminal wire 11 connected to the terminal block 12 can be processed into a ring to ensure that it fits on the surface of the terminal block 12 and facilitates subsequent fixed connection.

[0048] Furthermore, a protective mechanism for sealing and protecting the rear side of the outer shell body 1 is provided on the rear side of the outer shell body 1. The protective mechanism includes a protective plate 10 provided on the rear side of the outer shell body 1 for sealing the rear side of the outer shell body 1. A fixing rod 20 is threadedly connected to the top and bottom of one side of the protective plate 10 and is threadedly connected to the surface of the outer shell body 1.

[0049] In this embodiment, the rear side of the outer casing 1 is open for mounting components such as the circuit board 7. After installation, the rear side of the outer casing 1 can be sealed by a protective mechanism. The protective plate 10 is detachably mounted on the rear side of the outer casing 1. After the protective plate 10 is connected to the rear side of the outer casing 1, it is connected to the surface of the outer casing 1 by a fixing rod 20, thereby fixing the position of the protective plate 10. At the same time, the material of the protective plate 10 must ensure that it will not affect the circuit board 7, and the size of the protective plate 10 is adapted to the size of the outer casing 1.

[0050] Meanwhile, the fixing rod 20 can be made of non-metallic material, and its material will not affect the normal use of the main body of the invention and the requirement to receive and transmit signals.

[0051] Furthermore, the top and bottom of the rear side of the outer shell 1 are recessed inward and threaded grooves are provided. The two threaded grooves correspond one-to-one with the two fixing rods 20. The inner wall of the threaded groove is provided with threads that are adapted to the surface of the fixing rod 20.

[0052] In this embodiment, the number of threaded grooves corresponds to the number of fixing rods 20, and when the protective plate 10 is installed on the rear side of the outer shell body 1, the positions of the threaded grooves and the fixing rods 20 correspond, thereby ensuring that when the protective plate 10 is installed on the rear side of the outer shell body 1, the fixing rods 20 can be rotated to make them threadedly connected to the inner wall surface of the threaded grooves, thereby quickly fixing the protective plate 10.

[0053] Furthermore, the top and bottom of the inner wall of the outer casing 1 are provided with positioning blocks 19 for positioning the main circuit board 7, and the positioning blocks 19 are made of non-metallic material.

[0054] In this embodiment, the material of the positioning block 19 is ensured not to affect the normal use of the circuit board 7, and the positioning block 19 is fixedly connected to the inner wall of the outer casing 1.

[0055] Furthermore, a positioning rod 17 is vertically threaded through the top of the mounting plate 3, and a limiting rod 18 is horizontally provided on the top of the inner side of the byte plate 4. The surface of the limiting rod 18 is provided with a threaded groove that matches the positioning rod 17.

[0056] In this embodiment, the surface of the limiting rod 18 is provided with a threaded groove that matches the positioning rod 17. The threaded groove extends through the surface of the limiting rod 18, and the inner wall of the threaded groove is provided with a thread that matches the positioning rod 17. This ensures that when the positioning rod 17 rotates in the forward direction, the positioning rod 17 moves downward into the threaded groove and connects with it, thereby fixing the byte piece 4 and achieving a stable effect when the byte piece 4 is in use. At the same time, the positioning rod 17 is made of non-metallic material, which will not affect the normal use of the present invention.

[0057] Furthermore, the top of the surface of the positioning plate 5 is provided with a through-hole 15 that is compatible with the limiting rod 18.

[0058] In this embodiment, the through-hole 15 ensures that the normal installation and use of the byte chip 4 and the positioning plate 5 will not be affected.

[0059] Furthermore, connecting posts 13 for connection are provided at both ends of the surface of the outer shell body 1.

[0060] In this embodiment, the connecting post 13 is used to connect to a designated location or to a corresponding component. The shape of the connecting post 13 is shown in the accompanying drawings in the specification.

[0061] The working principle and usage process of this invention: After the connecting plate 2, mounting plate 3, byte chip 4, positioning plate 5, and circuit main board 7 are installed in the designated positions, a parasitic capacitance is formed between the byte chip 4 and the metal coating formed by electroplating on the surface of the outer shell 1, and a parasitic capacitance is formed between the noise reduction terminal line 16 and the outer shell 1. When a human body generates additional electrostatic capacitance between itself and the byte chip 4 and the noise reduction terminal line 16 through its fingers, the conductive human body is connected to the ground, thereby gradually increasing the electrostatic capacitance and the count value. The detected signal is sent to the circuit main board through the noise reduction terminal line 16 and the connecting terminal line 11. In board 7, the circuit main board 7 processes the light board 8 to turn on the switch and light up the light board 8. During use, the noise reduction terminal line 16 achieves the purpose of noise reduction and reduces electromagnetic interference. The noise reduction terminal line 16 can also achieve the detection effect. At the same time, the byte chip 4 is shielded by the shielding electrode 9 to shield the electrical components on the circuit main board 7 to avoid affecting the byte chip 4, so as to achieve the purpose of good detection effect. It detects the tiny capacitance changes between the human body and the product, and performs detection quickly without touch pressing, avoiding contamination of the button surface and hygiene issues. It has a large detection area, low error probability, extremely low radiation and electromagnetic interference, and good use effect.

[0062] After the device is installed, it is installed on the rear side of the outer shell 1 via 10 to seal and protect the rear side of the outer shell 1. The fixing rod 20 is rotated to connect with the corresponding threaded groove, thereby completing the fixed connection of 10. 10 prevents the rear side of the outer shell 1 from being exposed to the external environment. At the same time, the material of the fixing rod 20 will not affect the use of this product, resulting in good performance.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A non-contact capacitive sensor, characterized in that, Including the outer shell body (1) whose surface is treated with electroplating process: A connecting plate (2) is provided in the inner cavity of the outer shell body (1), a mounting plate (3) is provided on one side of the connecting plate (2), a positioning plate (5) is provided in the inner cavity of the mounting plate (3) for auxiliary positioning, and a byte chip (4) is provided in the inner cavity of the mounting plate (3) for receiving human body charge. A circuit board (7) is provided in the inner cavity of the outer shell body (1) for receiving and processing transmitted signals, a lamp board (8) is provided on one side of the circuit board (7), and a shielding electrode (9) is provided on the lamp board (8) for shielding interference from electronic components. A noise reduction terminal line (16) for reducing electromagnetic interference is provided on the circuit main board (7), and one end of the noise reduction terminal line (16) passes through the connecting plate (2) and is coiled and disposed in the inner cavity of the mounting plate (3). A connection terminal line (11) is provided on the circuit main board (7), and one end of the connection terminal line (11) passes through the connecting plate (2) and the mounting plate (3) and is connected to the surface of the byte chip (4).

2. The non-contact capacitive sensor as described in claim 1, characterized in that: The surface of the positioning plate (5) is provided with a positioning piece (6), and the surface of the byte piece (4) is provided with a shape groove that matches the positioning piece (6).

3. A non-contact capacitive sensor as described in claim 2, characterized in that: The inner side of the byte chip (4) is provided with a terminal block (12), and the surface of the positioning plate (5) is provided with a connection port (14) that is compatible with the terminal block (12). The terminal block (12) is fixedly connected to one end of the connection terminal line (11).

4. A non-contact capacitive sensor as described in claim 1, characterized in that: The rear side of the outer shell body (1) is provided with a protective mechanism for sealing and protecting the rear side of the outer shell body (1). The protective mechanism includes a protective plate (10) provided on the rear side of the outer shell body (1) for sealing the rear side of the outer shell body (1). A fixing rod (20) is threadedly connected to the top and bottom of one side of the protective plate (10) and is threadedly connected to the surface of the outer shell body (1).

5. A non-contact capacitive sensor as described in claim 4, characterized in that: The top and bottom of the rear side of the outer shell body (1) are both recessed inward and threaded grooves are provided. The two threaded grooves correspond one-to-one with the two fixing rods (20). The inner wall of the threaded groove is provided with threads that are compatible with the surface of the fixing rod (20).

6. A non-contact capacitive sensor as described in claim 1, characterized in that: The top and bottom of the inner wall of the outer shell body (1) are provided with positioning blocks (19) for positioning the circuit main board (7), and the positioning blocks (19) are made of non-metallic material.

7. A non-contact capacitive sensor as described in claim 1, characterized in that: The mounting plate (3) has a vertically threaded positioning rod (17) threaded through its top, and a limiting rod (18) is horizontally positioned on the top of the inner side of the byte piece (4). The surface of the limiting rod (18) has a threaded groove that matches the positioning rod (17).

8. A non-contact capacitive sensor as described in claim 7, characterized in that: The top of the surface of the positioning plate (5) is provided with a through-hole (15) that is compatible with the limiting rod (18).

9. A non-contact capacitive sensor as described in claim 1, characterized in that: Both ends of the outer shell body (1) are provided with connecting posts (13) for connection.

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