Proximity sensor

Abstract

The invention provides a proximity sensor, comprising: a tube having an axially through first cavity, the tube comprising a head end and a tail end opposite to each other in the axial direction; the tail plug is internally provided with a second cavity, one axial end of the tail plug is connected to the tail end of the tube shell, and the other axial end of the tail plug is provided with a first wire outlet hole communicated with the second cavity; the electrical assembly comprises a circuit board and a resistance adjusting device arranged on the circuit board, one part of the circuit board is contained in the first cavity, the other part of the circuit board extends into the second cavity from the tail end, at least part of the resistance adjusting device is located in the second cavity, the circuit board is connected with a cable, and the cable is connected with the cable. And the cable penetrates out of the second cavity through the first wire outlet hole. The proximity sensor provided by the invention can improve the consistency and flexibility of products.

Description

Technical Field

[0001] The present disclosure relates to the technical field of proximity sensors, and in particular to a proximity sensor. Background Art

[0002] Inductive proximity sensors are based on the principle of electromagnetic induction. They detect the distance between the target metal object and the proximity sensor, convert the distance signal into an electrical signal to achieve the conversion of the control signal. They do not cause mechanical wear and have the advantages of high switching frequency and high precision. They are widely used in machinery manufacturing, electronics, automobiles, food plastics and other industries. Summary of the invention

[0003] In order to solve at least one technical problem in the above-mentioned prior art, an embodiment of the present disclosure provides a proximity sensor.

[0004] The technical solutions provided by the embodiments of the present disclosure are as follows:

[0005] In an embodiment of the present disclosure, a proximity sensor is provided, comprising:

[0006] A tube shell has a first cavity that runs axially through the tube shell, and the tube shell includes a head end and a tail end that are opposite to each other in the axial direction;

[0007] A tail plug having a second cavity therein, one axial end of the tail plug being connected to the tail end of the tube shell, and the other axial end of the tail plug being provided with a first wire outlet hole communicating with the second cavity; and

[0008] An electrical component includes a circuit board and a resistance adjusting device arranged on the circuit board, wherein a portion of the circuit board is accommodated in the first cavity, and another portion extends from the tail end to the second cavity, and the resistance adjusting device is at least partially located in the second cavity, and a cable is connected to the circuit board, and the cable passes through the first outlet hole and out of the second cavity.

[0009] Exemplarily, the tail plug includes a first connecting portion for connecting to the tail end, the first connecting portion is inserted into the tail end, and there is an interference fit between the first connecting portion and the tail end.

[0010] Exemplarily, a sealing protrusion structure is provided on at least one of the circumferential outer surface of the first connecting portion and the axial inner surface of the tail end, and the first connecting portion is interference fit with the tail end through the sealing protrusion structure.

[0011] Exemplarily, the sealing protrusion structure includes at least one sealing protrusion ring circumferentially arranged around the first connecting portion.

[0012] Exemplarily, at least one radial groove or radial hole is provided on the circumferential outer surface of the first connecting portion, the first connecting portion and the tail end are fixed by filling glue, and at least part of the filling glue is located in the radial groove or radial hole.

[0013] Exemplarily, the electrical component also includes a light-emitting element arranged on the circuit board; the tail plug is constructed as a lampshade structure, which includes a light-transmissive base, the base includes a first connecting portion connected to the tail end and a light-emitting portion for emitting light, wherein the light-emitting portion is located on a side of the first connecting portion axially away from the tail end, and the light-emitting portion circumferentially surrounds the light-emitting element.

[0014] Exemplarily, the material of the matrix includes a transparent matrix material and a scattering particle material doped in the transparent matrix material, and the scattering particle material includes titanium dioxide.

[0015] Exemplarily, the light emitting portion circumferentially surrounds the resistor, and in the axial direction of the tube shell, the width of the light emitting portion is greater than or equal to the width of the resistor; and the difference between the maximum diameter of the light emitting portion and the tube shell is less than or equal to a first threshold.

[0016] Exemplarily, a reflective structure is provided on at least one of the circumferential inner surface and the circumferential outer surface of the tail plug, the reflective structure is opposite to the axial position of the light-emitting element in the tube shell, and the reflective structure is configured to be able to reflect at least part of the light emitted by the light-emitting element to the light-emitting portion.

[0017] Exemplarily, the reflective structure includes a reflective cut surface inclined relative to the axial direction of the tube shell, and the reflective cut surface has an inclination angle of 30 to 60 degrees relative to the axial direction of the tube shell.

[0018] Exemplarily, the light emitting portion includes a light emitting surface and a light collecting surface which are adjacently arranged, the light emitting surface is an annular arc surface, the light collecting surface is an annular bevel surface, and the light collecting surface is configured to be able to collect at least part of the light emitted by the light emitting element.

[0019] Exemplarily, a prism structure is provided on at least one of the circumferential inner surface and the circumferential outer surface of the tail plug, and the prism structure is configured to diffuse the light emitted by the light emitting element.

[0020] Exemplarily, the prism structure includes a prism structure or a pyramid structure distributed in an array.

[0021] Exemplarily, the prism structure includes a plurality of side surfaces, and at least a portion of the side surfaces are configured to reflect the light emitted by the light emitting element toward the light emitting portion.

[0022] Exemplarily, the first wire outlet hole has an outer port away from the second cavity and an inner port close to the second cavity, and the first wire outlet hole is configured to gradually shrink from the outer port to the inner port, from wide to narrow.

[0023] Exemplarily, the circumferential inner side wall of the inner port is configured as an edge-shaped structure or a surface-shaped structure.

[0024] Exemplarily, the proximity sensor also includes a cable protective cover, which includes a sleeve portion and a bendable flexible protective portion, the sleeve portion is sleeved on one end of the tail plug provided with the first wire outlet hole, and the flexible protective portion has a second wire outlet hole, and the cable passing through the first wire outlet hole is installed in the second wire outlet hole.

[0025] Exemplarily, a plurality of openings are provided on the circumferential surface of the flexible protective portion, and the plurality of openings are arranged in sequence along the axial direction of the cable to form a plurality of opening units, each of the opening units includes at least one opening arranged along the circumference of the cable, and the openings in two adjacent opening units are arranged alternately.

[0026] Exemplarily, a dimension of the opening along the circumference of the cable is 4±1 mm, a dimension along the axial direction of the cable is 0.6±0.2 mm, and a spacing dimension between two adjacent opening units in the axial direction of the cable is 1±0.5 mm.

[0027] Exemplarily, the tail plug includes a second connecting portion for connecting with the sleeve portion, a concave-convex structure is provided on the circumferential outer surface of the second connecting portion, and a concave-convex matching structure is provided on the circumferential inner surface of the sleeve portion; wherein the sleeve portion is sleeved on the second connecting portion, and the concave-convex structure cooperates with the concave-convex matching structure to clamp and fix the sleeve portion and the second connecting portion.

[0028] Exemplarily, the concave-convex structure has a concave or convex height relative to the axial outer surface of the second connecting portion of 0.2 to 0.5 mm.

[0029] Exemplarily, the tail plug is constructed as a lampshade structure, which includes a light emitting portion, wherein the second connecting portion is located on a side of the light emitting portion away from the tube shell, and the difference between the maximum diameters of the sleeve portion and the light emitting portion is less than or equal to a second threshold.

[0030] Exemplarily, the cable located in the second cavity includes a wire exposure area and a wire wrapping area, the wire exposure area is electrically connected to the circuit board, and the length of the wire wrapping area along the extension direction of the cable is greater than or equal to 3 mm.

[0031] The beneficial effects brought by the embodiments of the present disclosure are as follows:

[0032] The proximity sensor provided in the embodiment of the present disclosure includes a tube shell, a tail plug and an electrical component, wherein the tube shell includes a head end and a tail end opposite to each other in the axial direction, the electrical component includes a circuit board and a resistance adjustment device arranged on the circuit board, the tail plug is connected to the tail end of the tube shell, and a part of the circuit board is placed in the first cavity of the tube shell, the other part of the circuit board extends to the second cavity of the tail plug, and the resistance adjustment device is at least partially located in the second cavity of the tail plug. In other words, the tail plug is constructed so that the second cavity can accommodate the resistance adjustment component, so that the resistance adjustment device is externally arranged on the outside of the tube shell. In this way, when it is necessary to perform resistance or potential adjustment operations on the resistance adjustment device, it is only necessary to remove the tail plug from the tube shell without removing the tube shell and repeating the test. After the entire proximity sensor is assembled, if the inductance value changes, the detachable tail plug can be re-debugged, thereby improving the consistency and flexibility of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 An exploded view showing a proximity sensor provided in an embodiment of the present disclosure;

[0034] Figure 2 It shows one of the front views of the proximity sensor provided in the embodiment of the present disclosure;

[0035] Figure 3 express Figure 2 Schematic diagram of the cross section along the AA direction;

[0036] Figure 4 One of the three-dimensional structural schematic diagrams of the tail plug of the proximity sensor provided in the embodiment of the present disclosure is shown;

[0037] Figure 5 One of the front views of the tail plug of the proximity sensor provided in the embodiment of the present disclosure is shown;

[0038] Figure 6 express Figure 5 Schematic diagram of the cross section along the BB direction;

[0039] Figure 7 A second schematic diagram showing the three-dimensional structure of a tail plug of a proximity sensor provided in an embodiment of the present disclosure;

[0040] Figure 8 A second front view of the tail plug of the proximity sensor provided in an embodiment of the present disclosure is shown;

[0041] Fig. 9 express Figure 8 Schematic diagram of the cross section along CC direction;

[0042] Fig.10 A third front view of the tail plug of the proximity sensor provided in an embodiment of the present disclosure;

[0043] Fig.11 express Fig.10 Schematic diagram of the cross section along the mid-DD direction;

[0044] Fig.12 express Fig.10 Side view of

[0045] Fig.13 The second front view of the proximity sensor provided by the embodiment of the present disclosure is shown, wherein the cables are not shown;

[0046] Fig.14 express Fig.13 Schematic diagram of the cross section along the EE direction;

[0047] Fig.15 A third schematic diagram showing the three-dimensional structure of a tail plug in a proximity sensor provided in an embodiment of the present disclosure;

[0048] Fig.16 One of the schematic diagrams showing the prism structure;

[0049] Fig.17 The second schematic diagram showing the prism structure;

[0050] Fig.18 A schematic diagram showing the three-dimensional structure of a cable protective cover in a proximity sensor provided in a disclosed embodiment;

[0051] Fig.19 A front view of a cable protective cover in a proximity sensor provided by an embodiment of the present disclosure is shown;

[0052] Fig. 20 express Fig.19 Schematic diagram of the cross-sectional structure in the FF direction;

[0053] Fig.21 A schematic diagram showing the connection structure between the tail plug and the cable protective sleeve in the proximity sensor provided by the embodiment of the present disclosure;

[0054] Fig. 22 One of the structural schematic diagrams showing the first wire outlet hole in the proximity sensor provided in the embodiment of the present disclosure;

[0055] Fig.23 A second structural schematic diagram showing a first wire outlet hole in a proximity sensor provided in an embodiment of the present disclosure;

[0056] Fig.24 A third structural schematic diagram showing the first wire outlet hole in the proximity sensor provided in an embodiment of the present disclosure;

[0057] Fig.25 A fourth structural schematic diagram showing the first wire outlet hole in the proximity sensor provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0059] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one", "one" or "the" do not indicate quantity restrictions, but indicate that there is at least one. Similar words such as "include" or "comprise" mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Similar words such as "connect" or "connected" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0060] The features such as "parallel", "perpendicular", and "same" used in the embodiments of the present disclosure include the features such as "parallel", "perpendicular", and "same" in a strict sense, as well as the cases where "approximately parallel", "approximately perpendicular", "approximately the same", etc. include certain tolerances, taking into account the tolerances associated with the measurement of specific quantities (e.g., the limitations of the measurement system), and represent the acceptable deviation range for a specific value determined by ordinary technicians in the field. For example, "approximately" can mean within one or more standard deviations, or within 3% or 5% of the value.

[0061] In addition, in this document, unless otherwise defined, the terms "substantially", "substantially", "approximately" and "about" are used to describe and explain small changes. When used with an event or situation, these terms can cover situations where the event or situation occurs exactly, and can also cover situations where the event or situation occurs approximately. For example, when used with a numerical value, these terms can include a range of variation of less than or equal to 10% of the numerical value, such as less than or equal to ±5%, less than or equal to ±4%, less than or equal to ±3%, less than or equal to ±2%, less than or equal to ±1%, less than or equal to ±0.5%, less than or equal to ±0.1%, less than or equal to ±0.05%. The term "substantially coplanar" can refer to two surfaces being arranged along the same plane in the micrometer range, for example, arranged along the same plane within 40μm, 30μm, 20μm, 10μm or 1μm.

[0062] Before describing the proximity sensor provided by the embodiment of the present disclosure, the following description is given of the related technologies:

[0063] Inductive proximity sensor is an important type of proximity switch, mainly used for sensing metal targets. When a conductor is close to the electromagnetic field generated by the coil of the proximity sensor, eddy currents are induced inside the conductor. The reaction of the eddy currents on the electromagnetic system of the proximity sensor will change the electromagnetic parameters of the proximity sensor, thereby identifying the approach and distance of the conductor and controlling the on and off of the switch.

[0064] The proximity sensor mainly includes a header plug, electrical components, a tube shell and a tail plug, among which the header plug is installed at one axial end of the tube shell, the tail plug is installed at the other end of the axis of the tube shell, and the electrical components include a circuit board and a resistor. In order to ensure the measurement stability of the proximity sensor, the internal cavity of each component is filled with potting glue to tightly combine the components.

[0065] However, the proximity sensors in the related art have problems such as poor product consistency, low debugging accuracy and efficiency, and insufficient flexibility.

[0066] After research, the applicant of the present disclosure found that one of the reasons for the above-mentioned problem is that since the resistance adjustment device is built into the tube shell, if the resistance adjustment device is to be adjusted, the tube shell needs to be repeatedly disassembled and tested, which will affect product consistency, debugging accuracy and efficiency; and, the assembly process of the proximity sensor is to first fix the head plug and the tube shell with instant adhesive, and then fill the glue, and after the glue filling, the tail plug is assembled on the tube shell. In this way, since the resistance adjustment device is built into the tube shell, if the inductance value changes, the resistance adjustment device cannot be debugged again after the glue filling because the glue filling has been completed, resulting in insufficient flexibility.

[0067] In order to improve the above problems, the present disclosure provides a proximity sensor. Figures 1 to 3As shown, the proximity sensor in the embodiment of the present disclosure includes:

[0068] The tube shell 100 has a first cavity 110 that runs axially therethrough, and the tube shell 100 includes a head end 100A and a tail end 100B that are opposite to each other in the axial direction;

[0069] A tail plug 200 having a second cavity 210 therein, one axial end of the tail plug 200 being connected to the tail end 100B of the tube shell 100, and the other axial end of the tail plug 200 being provided with a first wire outlet hole 220 communicating with the second cavity 210; and

[0070] The electrical component 300 includes a circuit board 310 and a resistance adjusting device 320 disposed on the circuit board 310. A portion of the circuit board 310 is accommodated in the first cavity 110, and another portion extends from the tail end 100B to the second cavity 210, and the resistance adjusting device 320 is at least partially located in the second cavity 210. A cable 330 is connected to the circuit board 310, and the cable 330 passes through the first outlet hole 220 and out of the second cavity 210.

[0071] In the proximity sensor provided by the embodiment of the present disclosure, a portion of the circuit board 310 is placed in the first cavity 110 of the tube shell 100, and another portion of the circuit board 310 extends into the second cavity 210 of the tail plug 200, and the resistance adjustment device 320 is at least partially located in the second cavity 210 of the tail plug 200. In other words, the tail plug 200 is constructed so that the second cavity 210 can accommodate the resistance adjustment component, so that the resistance adjustment device 320 is externally arranged on the outside of the tube shell 100.

[0072] In this way, when it is necessary to adjust the resistance or potential of the resistance adjustment device 320, only the tail plug 200 needs to be removed from the tube shell 100, and there is no need to remove the tube shell 100 and perform testing, thereby improving the consistency, debugging accuracy and efficiency of the product; and after assembling the entire proximity sensor, if the inductance value changes, only the tail plug 200 needs to be removed for re-debugging, thereby improving the flexibility of the product.

[0073] It should be noted that in the above solution, the resistance trimming device 320 is placed outside the tube shell 100 and is contained in the second cavity 210 of the tail plug 200. For the tail plug 200, it needs to have enough space to accommodate the circuit board 310 and the resistance trimming device 320 and other components. For example, the diameter of the second cavity 210 needs to be greater than the width of the circuit board 310 extending into the second cavity 210. Exemplarily, the width of the circuit board 310 is 4.8 mm, and the diameter of the second cavity 210 can be 5 mm. The above is only an example and is not limited thereto.

[0074] In addition, it should be noted that the resistance trimming device 320 is at least partially located in the second cavity 210. Specifically, the resistance trimming device 320 may include an operable area 321 for performing resistance or potential adjustment operations. For example, the operable area 321 may be an adjustment nut, etc. At least the operable area 321 is completely accommodated in the second cavity 210, so that the resistance trimming device 320 can be smoothly adjusted when the tail plug 200 is removed. The area of ​​the resistance trimming device 320 other than the operable area 321 can be placed in the tube shell 100 or the tail plug 200.

[0075] In some exemplary embodiments, the tube shell 100 serves as a main housing component of the proximity sensor, and can be implemented by a threaded tube or the like.

[0076] like Figures 1 to 3 As shown, in some embodiments, the proximity sensor further includes a head plug 700, a magnetic core 500, and a coil 600, etc. The magnetic coil is assembled on the magnetic core 500, and is accommodated and fixed in the head plug 700. The head plug 700 is connected to the head end 100A of the tube shell 100, and the circuit board 310 is electrically connected to the magnetic core 500 through wires such as enameled wires. Among them, the head plug 700 and the tube shell 100 can be fixed by instant glue, and then the whole is fixed by filling glue (such as potting glue) 800.

[0077] In addition, in some exemplary embodiments, Figure 1 As shown, the tail plug 200 includes a first connecting portion 201 for connecting to the tail end 100B, the first connecting portion 201 is inserted into the tail end 100B, and the first connecting portion 201 and the tail end 100B are interference fit.

[0078] By adopting the above solution, the tail plug 200 can be easily removed from the tube shell 100 by performing interference fit between the tail plug 200 and the tube shell 100, and the fixing effect between the tail plug 200 and the tube shell 100 is ensured.

[0079] See also Figure 1 As shown, the first connection portion 201 may be configured as a hollow shaft coaxial with the tube housing 100 .

[0080] In some exemplary embodiments, in combination Figure 1 , Figures 4 to 6As shown, a sealing protrusion structure 2011 is provided on at least one of the circumferential outer surface of the first connection portion 201 and the axial inner surface of the tail end 100B, and the first connection portion 201 is interference-fitted with the tail end 100B through the sealing protrusion structure 2011 .

[0081] In the above scheme, for example, see Figure 5 As shown, the sealing protrusion structure 2011 includes at least one sealing protrusion ring 2011' arranged circumferentially around the first connecting portion 201. For example, see Figure 5 As shown, in some embodiments, the sealing protrusion rings 2011' may have two. The number of the sealing protrusion rings 2011' is not limited herein.

[0082] In the above scheme, by setting a sealing protrusion structure 2011 on the circumferential outer surface of the first connecting part 201, the purpose of interference fit with the tail end 100B is achieved. The structure is simple and easy to process and shape, which can enhance the fixing effect between the tube shell 100 and the tail plug 200.

[0083] In addition, the first connecting portion 201 and the tube shell 100, in addition to the interference fit therebetween, can also be fixed by the filling glue 800. The sealing protrusion structure 2011 can not only improve the matching stability between the tube shell 100 and the tail plug 200, but also prevent the occurrence of glue overflow, glue leakage, etc.

[0084] In addition, a smaller interference is convenient for assembly and disassembly, and a larger interference is greater in connection strength. In some embodiments, taking an M8 proximity sensor as an example, the diameter of the M8 proximity sensor is 8 mm, and its unilateral interference may be 0.07-0.15 mm, for example, the unilateral interference may be approximately 0.1 mm.

[0085] However, the interference fit between the first connection part 201 and the tube shell 100 is not limited thereto. For example, the inner diameter of the entire first connection part 201 may be designed to be slightly larger than or equal to the diameter of the tail end 100B of the tube shell 100 to achieve an interference fit between the two; or, the first connection part 201 and the tube shell 100 may also be interference fit through threads.

[0086] In some exemplary embodiments, Figure 3 and Figure 4 As shown, at least one radial groove or radial hole 2012 is provided on the circumferential outer surface of the first connecting portion 201 , and the first connecting portion 201 and the tail end 100B are fixed by a filling glue 800 , and at least part of the filling glue 800 is located in the radial groove or radial hole 2012 .

[0087] By adopting the above solution, by providing the radial groove or radial hole 2012 on the first connecting portion 201, the fixing effect between the tube shell 100 and the tail plug 200 can be enhanced. Specifically, when the tube shell 100 and the tail plug 200 are filled with a filling glue (such as a potting glue), the filling glue will penetrate into the radial groove or radial hole 2012 and solidify to form a structure similar to a card slot, thereby enhancing the fixing effect.

[0088] The size, shape and number of the radial grooves or radial holes 2012 can be designed according to actual needs, and the present disclosure does not limit them. For example, taking the M8 specification proximity sensor as an example, the diameter of the radial grooves or radial holes 2012 can be 1.5 mm, and the number can be 2. The shape of the radial grooves or radial holes 2012 can be any suitable shape such as circular, square, triangular, polygonal, etc.

[0089] In some embodiments, Figure 4 As shown, the radial groove or radial hole 2012 may be located on the sealing protrusion structure 2011, and the diameter of the radial groove or radial hole 2012 is greater than the width of the sealing protrusion structure 2011. However, it is not limited thereto.

[0090] In addition, in some exemplary embodiments, see Figures 1 to 12 As shown, the electrical component 300 also includes a light-emitting element 340 arranged on the circuit board 310; the tail plug 200 is constructed as a lampshade structure, which includes a light-transmissive base 200', the base 200' includes the first connecting part 201 connected to the tail end 100B, and also includes a light emitting part 202 for emitting light, wherein the light emitting part 202 is located on the side of the first connecting part 201 axially away from the tail end 100B.

[0091] By adopting the above scheme, the light emitting element 340 and the light emitting portion 202 cooperate as an indicator light, so as to achieve the purpose of setting the indicator light of the proximity sensor at the tail of the proximity sensor. The color, brightness, etc. of the indicator light can indicate the working status of the proximity sensor.

[0092] In some embodiments, the light emitting portion 202 circumferentially surrounds the light emitting element 340. In other words, the light emitting portion 202 may be in the shape of a circular ring, surrounding the light emitting element 340, and can achieve a 360° surround display effect.

[0093] The uniformity of the light brightness of the indicator light will greatly affect the display effect and product positioning of the proximity sensor. In the related art, the light brightness of the indicator light on the proximity sensor varies greatly, and the position of the light emitting element 340 on the circuit board 310 is strictly required, and the layout flexibility of the circuit board 310 is poor.

[0094] In some exemplary embodiments of the present disclosure, the material of the substrate 200' includes a transparent substrate material and a scattering particle material doped in the transparent substrate material, the scattering particle material includes titanium dioxide; the transparent substrate material includes at least one of polycarbonate (PC) and acrylonitrile-butadiene-styrene (ABS). In this way, by doping the substrate 200' with scattering particle materials such as titanium dioxide, the scattering effect of light inside the substrate 200' can be enhanced to improve the uniformity of light output.

[0095] The addition ratio of the doping material in the transparent base material is not limited herein. For example, in some embodiments, the mass ratio of the transparent base material to the doping material is 2000:1.

[0096] Furthermore, in some exemplary embodiments, Figures 10 to 12 As shown, the substrate 200' has the second cavity 210 inside, and the inner wall surface a of the substrate 200' can be a mirror surface to improve the light transmittance; the outer wall surface b of the substrate 200' can be a frosted surface at least in the area corresponding to the light emitting portion 202 to increase the diffuse reflection effect of the emitted light.

[0097] It should be noted that, in the above scheme, the light emitting portion 202 circumferentially surrounds the light emitting element 340. It can be that the light emitting portion 202 is directly opposite to the light emitting element 340 and circumferentially surrounds the light emitting element 340. It can also be that the light emitting portion 202 is offset from the light emitting element 340 and the light emitting portion 202 circumferentially surrounds the light emitting element 340.

[0098] Furthermore, in some exemplary embodiments, Figure 3 As shown, the light emitting portion 202 circumferentially surrounds the resistor trimming device 320 , and in the axial direction of the tube shell 100 , the light emitting portion 202 is directly opposite to the resistor trimming device 320 , and the width of the light emitting portion 202 is greater than or equal to the width of the resistor trimming device 320 .

[0099] In the above scheme, the first connecting portion 201 is connected to the light emitting portion 202. Since the first connecting portion 201 is located on a side of the light emitting portion 202 close to the tube shell 100 and is connected to the tail end 100B of the tube shell 100, the light emitting portion 202 serves as the main structure of the space for accommodating the circuit board 310 and the resistor adjustment device 320. Therefore, the resistor adjustment device 320 can be directly opposite to the light emitting portion 202 along the axial direction of the tube shell 100, and the width of the light emitting portion 202 is greater than or equal to the width of the resistor adjustment device 320. In this way, it can be ensured that the tail plug 200 has enough space to accommodate the circuit board 310 and the resistor adjustment device 320, and when the tail plug 200 is removed, the resistor adjustment device 320 can be fully exposed to facilitate the adjustment operation.

[0100] For example, along the axial direction of the tube shell 100, the width of the resistor trimming device 320 can be 2 mm, and the width of the light emitting portion 202 can be 2.5 mm, wherein 0.5 mm is the allowable assembly error value. However, the above is only an example, and the dimensions of the light emitting portion 202 and the resistor trimming device 320 are not limited thereto.

[0101] In addition, in some embodiments, the difference between the maximum diameter of the light-emitting portion 202 and the tube shell 100 is less than or equal to a first threshold value. The first threshold value can be as close to 0 as possible so that the tail plug 200 is roughly flush with the outer surface of the tube shell 100. Here, "roughly" means within one or more standard deviations, or within 3% or 5% of the value. For example, in some embodiments, the maximum outer diameter of the tube shell 100 and the light-emitting portion 202 can be 6.7 mm.

[0102] Furthermore, in some exemplary embodiments, Figures 10 to 15 As shown, a reflective structure 204 is provided on at least one of the circumferential inner surface and the circumferential outer surface of the tail plug 200, and the reflective structure 204 is opposite to the axial position of the light-emitting element 340 in the tube shell 100, and the reflective structure 204 is configured to be able to reflect at least part of the light emitted by the light-emitting element 340 to the light-emitting portion 202.

[0103] By adopting the above scheme, by setting the reflective structure 204 at the position corresponding to the light-emitting element 340 on the tail plug 200, it can be ensured that more light enters the light-emitting portion 202 after reflection. Moreover, due to the setting of the reflective structure 204, the layout position of the light-emitting element 340 can be more flexible. For example, the light-emitting element 340 can be arranged at any position in the tail plug 200, as long as the light is reflected to the light-emitting portion 202 through the reflective structure 204, which provides convenience for the layout of the circuit board 310.

[0104] In some exemplary embodiments, Figures 10 to 14 As shown, the reflective structure 204 includes a reflective facet 2041 tilted relative to the axial direction of the tube housing 100, and the reflective facet 2041 is tilted at an angle of 30 to 60° relative to the axial direction of the tube housing 100. For example, the reflective facet 2041 is tilted at an angle of 45° relative to the axial direction of the tube housing 100.

[0105] See also Fig.10 and Fig.11 As shown, in some embodiments, the reflective structure 204 is disposed on the first connecting portion 201. Since the light emitting portion 202 is located on the side of the first connecting portion 201 away from the tube shell 100, the inclination direction of the reflective section 2041 is: from the side close to the light emitting portion 202 to the side away from the light emitting portion 202, and gradually inclines toward the direction close to the center of the first connecting portion 201. The light emitting element 340 can be arranged directly opposite to the reflective section 2041, so that the light of the light emitting element 340 can be reflected to the light emitting portion 202 via the reflective section 2041.

[0106] It is understandable that the above is only an example, and in other embodiments, the inclination angle and inclination direction of the reflective cut surface 2041 are not limited thereto. In addition, the reflective cut surface 2041 may be arranged circumferentially around the first connecting portion 201, and there may be only one reflective cut surface 2041, or there may be two or more reflective cut surfaces 2041.

[0107] In addition, it should be noted that the reflective structure 204 can be arranged on the circumferential inner surface of the tail plug 200 , or on the circumferential outer surface of the tail plug 200 , or on both the circumferential inner surface and the circumferential outer surface of the tail plug 200 .

[0108] Among them, Fig.15 As shown, when the reflective structure 204 is provided on both the circumferential inner surface and the circumferential outer surface of the tail plug 200 , the reflective structure 204 on the circumferential inner surface 2001 of the tail plug 200 may be located at a different position from the reflective structure 204 on the circumferential outer surface 2002 of the tail plug 200 .

[0109] Furthermore, in some exemplary embodiments, Figures 10 to 14 As shown, the light emitting portion 202 includes a light emitting surface 202a and a light collecting surface 202b which are adjacently arranged, the light emitting surface 202a is an annular arc surface, the light collecting surface 202b is an annular bevel surface, and the light collecting surface 202b is configured to be able to collect at least part of the light emitted by the light emitting element 340.

[0110] In the above scheme, the annular arc surface refers to a three-dimensional curved surface, which is a flat surface formed by bending or rotating an annular boundary (i.e., a ring) in a certain direction. The annular beveled surface refers to a cross section formed by a plane passing through an annular object in an oblique manner. In other words, the light-emitting surface 202a can be regarded as a circular ring-shaped surface parallel to the axial direction of the tube shell 100, and the light-collecting surface 202b is inclined relative to the light-emitting surface 202a. In this way, at least part of the light of the light-emitting element 340 can be directly emitted through the light-emitting surface 202a, and at least part of the light can be concentrated by the light-collecting surface 202b and then emitted, which can enhance the brightness of the light-emitting portion 202.

[0111] In some embodiments, the angle β of the light-collecting surface 202 b relative to the light-emitting surface 202 a may be 30-60°, for example, β is 45°, but the present invention is not limited thereto.

[0112] Along the axial direction of the tube shell 100 , the width of the light emitting surface 202a can be adjusted according to the layout of the circuit board 310 inside the tail plug 200 . For example, the width of the light emitting surface 202a can be greater than or equal to the width of the resistance adjustment device 320 .

[0113] Furthermore, in some exemplary embodiments, Figures 10 to 15 As shown, a prism structure 205 is provided on at least one of the circumferential inner surface and the circumferential outer surface of the tail plug 200, and the prism structure 205 is configured to diffuse the light emitted by the light emitting element 340. By providing the prism structure 205, the light emitted by the light emitting element 340 can be reflected and refracted multiple times when passing through the surface of the prism structure 205, so that the light is distributed more evenly in the light emitting portion 202.

[0114] For example, Figures 10 to 17 As shown, the prism structure 205 includes prism structures 2053 or pyramid structures 2052 distributed in an array.

[0115] For example, in some embodiments, the plurality of prism structures 2053 may be arranged in one or more circles along the circumferential inner surface of the tail plug 200, and the prism structure 2053 may be a triangular prism structure 2053, and the cross section may be a triangle (e.g., an isosceles triangle), so that the light may be evenly diffused within a larger angle range. It is understood that the prism structure 2053 is not limited to the triangular prism structure 2053, and its cross section may include but is not limited to a triangle, an ellipse, a semicircle, a polygon, etc.

[0116] For example, in some other embodiments, Fig.16As shown, the pyramid structure 2052 may be a triangular pyramid structure, such as a regular triangular pyramid structure, and the side surface 2050 of the regular triangular pyramid structure is an isosceles right triangle. Fig.17 As shown, in some other embodiments, the pyramid structure 2052 may also be a quadrangular pyramid structure, such as a regular quadrangular pyramid structure, and the side surface 2050 of the regular quadrangular pyramid structure is an equilateral triangle. It is understood that the specific implementation of the pyramid structure 2052 is not limited thereto.

[0117] In addition, in some exemplary embodiments, the prism structure 205 includes a plurality of side surfaces 2050, and at least some of the side surfaces 2050 are configured to reflect the light emitted by the light emitting element 340 to the light emitting portion 202. In this way, the prism structure 205 can also reflect light.

[0118] In some embodiments, when the prism structure 205 can also reflect light, the reflective structure 204 can be omitted from the tail plug 200. Fig.15 As shown, the prism structure 205 is disposed on the circumferential outer surface of the tail plug 200 , and the prism structure 205 is constructed so that at least part of the side surface 2050 can reflect the light emitted by the light emitting element 340 to the light emitting portion 202 .

[0119] In addition, it should be noted that the arrangement position of the prism structure 205 on the tail plug 200 can be arranged in combination with the actual product and the optical path. For example, at least part of the prism structure 205 can be arranged in the area corresponding to the light emitting surface 202a, but it is not limited to this.

[0120] It should be noted that if Fig.21 As shown, the tail plug 200 can be an integrally molded structural part. For example, the tail plug 200 can be molded by an injection molding process. Optical structures such as the prism structure 205 and / or the reflective structure 204 can be set in the tail plug 200 without increasing the difficulty of mold opening.

[0121] Furthermore, in some exemplary embodiments, Figure 6 As shown, the first wire outlet hole 220 has an outer port 220a away from the second cavity 210 and an inner port 220b close to the second cavity 210, and the first wire outlet hole 220 is constructed to gradually shrink from the outer port 220a to the inner port 220b.

[0122] In the above scheme, the first wire outlet hole 220 on the tail plug 200 is constructed so that the outer port 220a is wide and the inner port 220b is narrow. For example, the first wire outlet hole 220 can be roughly trumpet-shaped, which is convenient for the cable 330 to pass through the outer port 220a, and the cable 330 can be fastened through the inner port 220b to prevent the cable 330 from loosening. When the tail plug 200 is filled with glue, glue leakage can be prevented, thereby ensuring the stability of the electrical connection and improving the reliability of the product.

[0123] In some embodiments, the inner diameter of the inner port 220b may be substantially the same as the diameter of the cable 330, and the inner diameter of the outer port 220a may be larger than the diameter of the cable 330, for example, the difference between the inner diameter of the outer port 220a and the diameter of the cable 330 is approximately 0.2 mm. For example, the diameter of the cable 330 is 2.8 mm, the inner diameter of the inner port 220b is 2.8 mm, and the inner diameter of the outer port 220a is 3.0 mm. However, this is not limited thereto.

[0124] In some exemplary embodiments, Figure 22 to Figure 25 As shown, the circumferential inner wall of the inner port 220 b may be configured as an edge-shaped structure 220 c or a surface-shaped structure 220 d. In other words, the inner port 220 b may be in line-surface contact or surface-surface contact with the cable 330 .

[0125] Since the cable 330 needs to pass through the first cable outlet hole 220 , if the contact area between the inner port 220 b and the cable 330 is too large and the friction force is too large, the cable 330 may not pass through the first cable outlet hole 220 smoothly.

[0126] Therefore, when the circumferential inner wall of the inner port 220b is an edge-shaped structure 220c, the contact area between the first outlet hole 220 and the cable 330 is small, which can ensure that the cable 330 is fixed and facilitate the cable 330 to pass through the first outlet hole 220 smoothly.

[0127] When the circumferential inner wall of the inner port 220b is a planar structure 220d, the width of the circumferential inner wall of the inner port 220b along the axial direction of the tube shell 100 is not too large to avoid generating a large friction force and causing difficulty in threading. For example, the width of the planar structure 220d along the axial direction of the tube shell 100 can be less than or equal to 0.5 mm.

[0128] Also, see Figure 6As shown, in some embodiments, when the circumferential inner wall of the inner port 220b is an edge-shaped structure 220c, the tail plug 200 has an end cover 206 at the end where the first outlet hole 220 is provided, and the first outlet hole 220 is provided on the end cover 206. Fig. 22 and Fig.23 As shown, the inner side wall 2061 of the end cover 206 facing the second cavity 210 may be a vertical wall perpendicular to the cable 330 or an inclined wall inclined relative to the cable 330 .

[0129] Likewise, see Figure 6 As shown, in some embodiments, when the circumferential inner wall of the inner port 220b is a planar structure 220d, the tail plug 200 has an end cover 206 at one end where the first outlet hole 220 is provided, and the first outlet hole 220 is provided on the end cover 206. Fig.24 and Fig.25 As shown, the inner side wall 2061 of the end cover 206 facing the second cavity 210 may be a vertical wall perpendicular to the cable 330 or an inclined wall inclined relative to the cable 330 .

[0130] In some exemplary embodiments, Figure 1 , Figures 18 to 20 As shown, the proximity sensor also includes a cable protective sleeve 400, which includes a sleeve portion 410 and a bendable flexible protective portion 420, the sleeve portion 410 is sleeved on one end of the tail plug 200 having the first wire outlet hole 220, the flexible protective portion 420 has a second wire outlet hole 430, and the cable 330 passing through the first wire outlet hole is installed in the second wire outlet hole 430.

[0131] By adopting the above solution and providing the cable protective cover 400, the bending and twisting resistance of the cable 330 can be improved, the tensile strength can be improved, and the appearance can be improved.

[0132] Furthermore, in the related art, in order to improve the tensile strength of the cable 330, the circuit board 310 is built into the tube shell 100 to ensure that the filling glue can completely wrap the protective layer of the cable 330, resulting in the resistance adjustment device 320 being unable to be placed outside the tube shell 100. In the above scheme, by providing the cable protective cover 400, it can be ensured that when the resistance adjustment device 320 is placed outside the tube shell 100, the tensile strength requirement of the cable 330 can also be met.

[0133] In some exemplary embodiments, a plurality of openings 440 are provided on the circumferential surface of the flexible protective portion 420, and the plurality of openings 440 are arranged in sequence as a plurality of opening units S along the axial direction of the cable 330, each of the opening units S includes at least one opening 440 arranged along the circumference of the cable 330, and the openings 440 in two adjacent opening units S are arranged alternately.

[0134] By adopting the above solution, by providing a plurality of openings 440 on the peripheral surface of the flexible protective portion 420 , it is not only beneficial for the bending of the cable 330 , but also can play a role in supporting the cable 330 , thereby improving the tensile and bending resistance of the cable 330 .

[0135] In some exemplary embodiments, the size of the opening 440 along the circumference of the cable 330 is 4±1 mm, the size along the axial direction of the cable 330 is 0.6±0.2 mm, and the spacing size between two adjacent opening units S in the axial direction of the cable 330 is 1±0.5 mm.

[0136] It should be understood that the above is only an example, and the manner in which the flexible protective portion 420 can achieve flexible bending is not limited thereto, and the number, shape, and size of the openings 440 are also not limited thereto.

[0137] In some embodiments, the cable protective cover 400 can be made of any suitable material such as rubber.

[0138] Furthermore, in some exemplary embodiments, Figures 1 to 6 , Figures 18 to 20 As shown, the tail plug 200 also includes a second connecting portion 203 for connecting with the sleeve portion 410, a concave-convex structure 2031 is provided on the circumferential outer surface of the second connecting portion 203, and a concave-convex matching structure 411 is provided on the circumferential inner surface of the sleeve portion 410; wherein, the sleeve portion 410 is sleeved on the second connecting portion 203, and the concave-convex structure 2031 cooperates with the concave-convex matching structure 411 to clamp and fix the sleeve portion 410 and the second connecting portion 203.

[0139] For example, the concave-convex structure 2031 may include a groove provided on the circumferential outer surface of the second connecting portion 203, and the concave-convex matching structure 411 may include a protrusion provided on the circumferential inner surface of the sleeve portion 410. The specific structures of the concave-convex structure 2031 and the concave-convex matching structure 411 are not limited.

[0140] In the above solution, the concave-convex structure 2031 and the concave-convex matching structure 411 cooperate with each other to ensure that the tail plug 200 is tightly connected to the cable protective sleeve 400. Taking the M8 specification proximity sensor as an example, the concave-convex structure 2031 can be recessed or protruded relative to the axial outer surface of the second connecting portion 203 by 0.2-0.5 mm, for example, 0.3 mm. However, this is not limited to this.

[0141] It should be noted that the above is only an example. In other embodiments, Fig.21 As shown, the tail plug 200 can also be integrally formed with the cable protective cover 400 by, for example, hot pressing molding or an integrated mold.

[0142] Furthermore, in some exemplary embodiments, Figures 1 to 4 As shown, when the tail plug 200 is constructed as a lampshade structure, it includes a light emitting portion 202, the second connecting portion 203 is located on the side of the light emitting portion 202 away from the tube shell 100, and the difference between the maximum diameter of the sleeve portion 410 and the light emitting portion 202 is less than or equal to a second threshold.

[0143] In other words, the difference between the outer diameter of the light emitting portion 202 and the outer diameter of the sleeve portion 410 is within the second threshold. The second threshold can be as close to 0 as possible so that the tail plug 200 is roughly flush with the outer surface of the tube shell 100. Here, "roughly" means within one or more standard deviations, or within 3% or 5% of the value.

[0144] Furthermore, in some exemplary embodiments, Figure 1 As shown, the cable 330 located in the second cavity 210 includes a wire exposure area 331 and a wire wrapping area 332, the wire exposure area 331 is electrically connected to the circuit board 310, and the length of the wire wrapping area 332 along the extension direction of the cable 330 is greater than or equal to 3 mm.

[0145] In the above solution, the wire exposed area 331 refers to the area where the wire of the cable 330 is not wrapped with a protective skin; the wire wrapped area 332 refers to the area where the wire of the cable 330 is wrapped with an insulating protective skin. In order to ensure the fixing effect of the cable 330, at least part of the area of ​​the cable 330 in the second cavity 210 is the wire wrapped area 332, that is, the wire is wrapped with a protective skin. In this way, when the tail plug 200 is inverted and potted, the filling glue 800 can be replaced and bonded with the cable 330 to improve the tensile strength of the cable 330.

[0146] The length of the wire wrapping area 332 along the extension direction of the cable 330 is greater than or equal to 3 mm, so as to further ensure the bonding effect between the cable 330 and the potting glue. It should be noted that when the length of the wire wrapping area 332 is greater than or equal to 3 mm, the length of the second cavity 210 may be greater than or equal to 3 mm. However, this is not limited to this.

[0147] There are a few points to note:

[0148] (1) The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure, and other structures may refer to the general design.

[0149] (2) For the sake of clarity, in the drawings used to describe the embodiments of the present disclosure, the thickness of layers or regions is exaggerated or reduced, that is, these drawings are not drawn according to the actual scale. It is understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, the element may be "directly" "on" or "under" the other element or there may be intermediate elements.

[0150] (3) In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

[0151] The above are only specific implementations of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and the protection scope of the present disclosure shall be based on the protection scope of the claims.

Claims

1. A proximity sensor, characterized in that: include: A tube shell has a first cavity that runs axially through the tube shell, and the tube shell includes a head end and a tail end that are opposite to each other in the axial direction; A tail plug having a second cavity therein, one axial end of the tail plug being connected to the tail end of the tube shell, and the other axial end of the tail plug being provided with a first wire outlet hole communicating with the second cavity; and An electrical component includes a circuit board and a resistance adjusting device arranged on the circuit board, wherein a portion of the circuit board is accommodated in the first cavity, and another portion extends from the tail end to the second cavity, and the resistance adjusting device is at least partially located in the second cavity, and a cable is connected to the circuit board, and the cable passes through the first outlet hole and out of the second cavity.

2. The proximity sensor according to claim 1, characterized in that: The tail plug includes a first connecting portion for connecting with the tail end, the first connecting portion is inserted into the tail end, and the first connecting portion and the tail end are interference fit.

3. The proximity sensor according to claim 2, characterized in that: A sealing protrusion structure is provided on at least one of the circumferential outer surface of the first connecting portion and the axial inner surface of the tail end, and the first connecting portion is interference-fitted with the tail end through the sealing protrusion structure.

4. The proximity sensor according to claim 3, characterized in that: The sealing protrusion structure includes at least one sealing protrusion ring circumferentially arranged around the first connecting portion.

5. The proximity sensor according to claim 2, characterized in that: At least one radial groove or radial hole is provided on the circumferential outer surface of the first connecting portion, the first connecting portion is fixed to the tail end by a filling glue, and at least a part of the filling glue is located in the radial groove or radial hole.

6. The proximity sensor according to claim 1, characterized in that: The electrical component also includes a light-emitting element arranged on the circuit board; the tail plug is constructed as a lampshade structure, which includes a light-transmissive base, the base includes a first connecting portion connected to the tail end and a light-emitting portion for emitting light, wherein the light-emitting portion is located on a side of the first connecting portion axially away from the tail end, and the light-emitting portion circumferentially surrounds the light-emitting element.

7. The proximity sensor according to claim 6, characterized in that: The material of the matrix includes a transparent matrix material and a scattering particle material doped in the transparent matrix material, and the scattering particle material includes titanium dioxide.

8. The proximity sensor according to claim 6, characterized in that: The light emitting portion circumferentially surrounds the resistance adjusting device, and in the axial direction of the tube shell, the light emitting portion is directly opposite to the resistance adjusting device, the width of the light emitting portion is greater than or equal to the width of the resistance adjusting device; and the difference between the maximum diameter of the light emitting portion and the tube shell is less than or equal to a first threshold value.

9. The proximity sensor according to claim 6, characterized in that: A reflective structure is provided on at least one of the circumferential inner surface and the circumferential outer surface of the tail plug, the reflective structure is opposite to the axial position of the light-emitting element in the tube shell, and the reflective structure is configured to be able to reflect at least part of the light emitted by the light-emitting element to the light-emitting portion.

10. The proximity sensor according to claim 9, characterized in that: The reflective structure comprises a reflective cut surface which is inclined relative to the axial direction of the tube shell, and the inclination angle of the reflective cut surface relative to the axial direction of the tube shell is 30-60 degrees.

11. The proximity sensor according to claim 6, characterized in that: The light emitting portion includes a light emitting surface and a light collecting surface which are adjacently arranged, the light emitting surface is an annular arc surface, the light collecting surface is an annular beveled surface, and the light collecting surface is configured to be able to collect at least part of the light emitted by the light emitting element.

12. The proximity sensor according to claim 6, characterized in that: A prism structure is provided on at least one of the circumferential inner surface and the circumferential outer surface of the tail plug, and the prism structure is configured to diffuse the light emitted by the light emitting element.

13. The proximity sensor according to claim 12, characterized in that: The prism structure includes a prism structure or a pyramid structure distributed in an array.

14. The proximity sensor according to claim 12, characterized in that: The prism structure includes a plurality of side surfaces, and at least a portion of the side surfaces are configured to reflect the light emitted by the light emitting element to the light emitting portion.

15. The proximity sensor according to claim 1, characterized in that: The first wire outlet hole has an outer port away from the second cavity and an inner port close to the second cavity, and the first wire outlet hole is configured to gradually shrink from the outer port to the inner port, from wide to narrow.

16. The proximity sensor according to claim 15, characterized in that: The circumferential inner side wall of the inner port is configured as an edge-shaped structure or a surface-shaped structure.

17. The proximity sensor according to claim 1, characterized in that: The proximity sensor also includes a cable protective cover, which includes a sleeve portion and a bendable flexible protective portion, the sleeve portion is sleeved on one end of the tail plug having the first wire outlet hole, the flexible protective portion has a second wire outlet hole, and the cable passing through the first wire outlet hole is installed in the second wire outlet hole.

18. The proximity sensor according to claim 17, characterized in that: A plurality of openings are provided on the circumferential surface of the flexible protective portion, and the plurality of openings are arranged in sequence along the axial direction of the cable to form a plurality of opening units, each of the opening units includes at least one opening arranged along the circumference of the cable, and the openings in two adjacent opening units are arranged in an alternating manner.

19. The proximity sensor according to claim 18, characterized in that: The size of the opening along the circumference of the cable is 4±1 mm, the size along the axial direction of the cable is 0.6±0.2 mm, and the spacing size between two adjacent opening units in the axial direction of the cable is 1±0.5 mm.

20. The proximity sensor according to claim 17, characterized in that The tail plug includes a second connecting portion for connecting with the sleeve portion, a concave-convex structure is provided on the circumferential outer surface of the second connecting portion, and a concave-convex matching structure is provided on the circumferential inner surface of the sleeve portion; wherein the sleeve portion is sleeved on the second connecting portion, and the concave-convex structure cooperates with the concave-convex matching structure to clamp and fix the sleeve portion and the second connecting portion.

21. The proximity sensor according to claim 20, characterized in that The concave-convex structure has a concave or convex height relative to the axial outer surface of the second connecting portion of 0.2-0.5 mm.

22. The proximity sensor according to claim 20, characterized in that The tail plug is constructed as a lampshade structure, which includes a light emitting portion, wherein the second connecting portion is located on a side of the light emitting portion away from the tube shell, and the difference between the maximum diameters of the sleeve portion and the light emitting portion is less than or equal to a second threshold.

23. The proximity sensor according to claim 1, characterized in that The cable located in the second cavity includes a wire exposure area and a wire wrapping area, the wire exposure area is electrically connected to the circuit board, and the length of the wire wrapping area along the extension direction of the cable is greater than or equal to 3 mm.

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