Photoelectric sensor and assembly method thereof

Abstract

The present invention relates to the technical field of photoelectric sensors, and in particular to a photoelectric sensor and an assembly method thereof. A potentiometer is mounted on a first circuit board, and a second circuit board is arranged perpendicular to the first circuit board. This allows the first circuit board to be installed first, followed by a first knob, and finally the second circuit board. This prevents the second circuit board from blocking the line of sight when installing the first knob, thereby achieving visual assembly of the first knob and the potentiometer. An operator can clearly observe the matching status with the first knob, greatly improving the assembly accuracy of the first knob. At the same time, the probability of damage to the first knob or the potentiometer due to blind installation is also greatly reduced, thereby optimizing the assembly process and improving assembly efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of photoelectric sensors, and in particular to a photoelectric sensor and an assembly method thereof. Background Art

[0002] A photoelectric sensor, also known as a reflective photoelectric switch, is a type of photoelectric sensor that combines a transmitter and a receiver. When an object passes by, it reflects enough light from the transmitter to reach the receiver. The receiver then receives the light and outputs a switch control signal.

[0003] In order to adjust the sensitivity of the photoelectric sensor, an adjustable potentiometer is usually set in the photoelectric sensor, and the potentiometer is adjusted by rotating an adjustment knob. Since the potentiometer is directly fixed on the main circuit board of the sensor, the main circuit board must be installed at the same time in order to install the potentiometer. This will result in the main circuit board blocking the operator's line of sight when installing the adjustment knob, making the installation of the adjustment knob a blind installation state. It is often impossible to assemble successfully in one go, and the assembly efficiency is low. In addition, the probability of damage to the adjustment knob and potentiometer will increase after multiple attempts at alignment. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art, thereby providing a photoelectric sensor and an assembly method thereof.

[0005] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0006] The present invention provides a photoelectric sensor, which includes: a lens bracket, which includes a bracket body; a receiving lens, which is mounted on the bracket body; a first circuit board, which is mounted on the lens bracket, and the first circuit board is located outside the bracket body; a potentiometer, which is mounted on the first circuit board; a first knob, which corresponds to the position of the potentiometer; and a second circuit board, which is located above the lens bracket, and the second circuit board is perpendicular to the first circuit board.

[0007] The photoelectric sensor provided by the present invention also includes a cable clip, which includes: a cable, which includes an internal wire and a jacket surrounding the internal wire; a shell, which is injection-molded as one piece with the jacket; the internal wire is passed through the shell and extends toward the inside of the shell.

[0008] The photoelectric sensor provided by the present invention also includes a shell, in which a plurality of first positioning columns and a plurality of guide plates are arranged, a plurality of first positioning holes corresponding to the first positioning columns are provided on the second circuit board, and the guide plates are in contact with the bracket body; the shell is provided with a receiving groove for accommodating the shell.

[0009] The photoelectric sensor provided by the present invention has a locking protrusion or a locking groove on at least one side wall of the shell, and the inner side wall of the accommodating groove has a locking structure corresponding to the locking protrusion or the locking groove. The accommodating groove is connected to the inner cavity of the shell through an opening, and the internal wire extends into the inner cavity of the shell through the opening.

[0010] In the photoelectric sensor provided by the present invention, the top of the first circuit board is provided with a protrusion extending upward, and the second circuit board is provided with a first slot matched with the protrusion.

[0011] The photoelectric sensor provided by the present invention also includes a third circuit board and a fourth circuit board, the third circuit board is located above the second circuit board, and the fourth circuit board is connected to the side end surface of the second circuit board and the side end surface of the third circuit board; at least one second positioning column is provided in the shell, and at least one second positioning hole corresponding to the second positioning column is provided on the second circuit board.

[0012] In the photoelectric sensor provided by the present invention, a shielding circuit board is provided between the second circuit board and the third circuit board, and a second slot matching the protrusion is provided on the shielding circuit board.

[0013] In the photoelectric sensor provided by the present invention, the shielding circuit board is an FPC, the end of which is bent and extended along the side surface of the second circuit board and fixed to the lower surface of the second circuit board.

[0014] The photoelectric sensor provided by the present invention also includes a copper sheet, which is U-shaped and includes a copper base plate and copper side plates located on both sides of the copper base plate. The copper base plate is located below the second circuit board, and the copper side plates on both sides are respectively located on both sides of the second circuit board and extend to the top of the third circuit board respectively, and the copper side plate on one side is located on the outside of the fourth circuit board.

[0015] The photoelectric sensor provided by the present invention, the lens bracket also includes at least two elastic arms, the elastic arms extend outward from an outer side wall of the bracket body, the elastic arms have a positioning portion extending inward, and the head of the positioning portion has a positioning surface; the first knob has a rod-shaped body, and the rod-shaped body is located between the positioning surfaces of the elastic arms.

[0016] The photoelectric sensor provided by the present invention has a first stop surface on the side of the positioning portion facing the bracket body, a convex shoulder outer ring is provided in the middle of the rod-shaped body, and a second stop surface is provided at the first end of the convex shoulder outer ring to match the first stop surface.

[0017] The photoelectric sensor provided by the present invention further includes a cover body; the cover body is arranged on top of the shell, and a second knob is installed on the cover body.

[0018] The photoelectric sensor provided by the present invention further includes a transmitting lens, and the transmitting lens is mounted on the housing.

[0019] The present invention also provides a method for assembling a photoelectric sensor, comprising the following steps:

[0020] S1. Install the receiving lens on the bracket body, and then install the lens bracket into the housing of the sensor;

[0021] S2, installing the first circuit board with the potentiometer installed on the lens bracket;

[0022] S3, passing the first knob through the housing and aligning it with the potentiometer;

[0023] S4. Install the second circuit board into the housing and place it above the lens holder.

[0024] The present invention also provides a method for assembling a photoelectric sensor, comprising the following steps:

[0025] S10, installing the receiving lens on the bracket body, and then installing the lens bracket into the housing along the guide plate;

[0026] S20, installing the first circuit board with the potentiometer installed on the lens bracket;

[0027] S30, passing the first knob through the housing and aligning it with the potentiometer;

[0028] S40, passing the second circuit board through the first positioning column, and then installing the second circuit board above the lens bracket;

[0029] S50, passing the third circuit board through the second positioning pillars, thereby installing the third circuit board above the second circuit board;

[0030] S60: Match the locking protrusion or locking groove of the enclosure with the locking structure of the receiving groove, thereby installing the cable clip on the housing.

[0031] In the method for assembling a photoelectric sensor provided by the present invention, the step S40 further comprises: plugging the first circuit board and the second circuit board together by engaging the protrusion with the first slot.

[0032] In the assembly method of the photoelectric sensor provided by the present invention, in step S30, a first sealing ring is first installed on the rod-shaped body of the first knob, and then the boss outer ring of the first knob is passed through the positioning surfaces of the at least two elastic arms, and then the first knob is aligned and assembled with the potentiometer.

[0033] The assembly method of the photoelectric sensor provided by the present invention further includes, between step S30 and step S40, step S31: installing the copper sheet on the lens bracket, with the copper base plate of the copper sheet placed on the upper surface of the lens bracket; in step S40, installing the second circuit board above the copper base plate.

[0034] In the method for assembling a photoelectric sensor provided by the present invention, step S50 further comprises the following steps:

[0035] S510, installing the shielding circuit board above the second circuit board;

[0036] S520, connecting the fourth circuit board to a side end surface of the second circuit board;

[0037] S530: Connect the side end surface of the third circuit board to the fourth circuit board.

[0038] In the method for assembling a photoelectric sensor provided by the present invention, in step S510, the second slot of the shielding circuit board is plugged into the bump, and the end of the shielding circuit board is fixed to the lower surface of the second circuit board by welding.

[0039] In the method for assembling a photoelectric sensor provided by the present invention, in step S520 and step S530, the fourth circuit board is connected to the side end surface of the second circuit board and the side end surface of the third circuit board by welding.

[0040] The assembly method of the photoelectric sensor provided by the present invention further includes, between step S520 and step S530, step S521, protruding the first positioning column from the top of the second circuit board and hot-melting it, thereby fixing the second circuit board in the shell; and after step S530, further includes step S540, protruding the second positioning column from the top of the third circuit board and hot-melting it, thereby fixing the third circuit board in the shell.

[0041] In the method for assembling the photoelectric sensor provided by the present invention, the step S60 further includes: passing the internal wire through the opening and extending it into the inner cavity of the shell.

[0042] The method for assembling a photoelectric sensor provided by the present invention further includes the following steps after step S60:

[0043] S70, welding the fourth circuit board, the copper side plate of the copper sheet, and the inner wire of the cable to the third circuit board respectively;

[0044] S80, filling the containing groove with sealant;

[0045] S90, placing the cover body equipped with the second knob on the shell, installing a cover plate at the bottom through groove of the shell, and welding the connection between the cover body, the cover plate and the shell.

[0046] In the assembly method of the photoelectric sensor provided by the present invention, the welding in steps S70 and S90 is ultrasonic welding; before step S90, the second knob is pre-installed with a second sealing ring and a retaining ring, and the emitting lens is pre-installed in the housing by dispensing.

[0047] The technical solution provided by the present invention has the following advantages:

[0048] 1. The photoelectric sensor and assembly method thereof provided by the present invention are applicable to reflective photoelectric sensors and can also be applied to other types of photoelectric sensors, such as photoelectric transmitters or photoelectric receivers. Based on the previous method in which the potentiometer is directly fixed on the main circuit board of the sensor, a first circuit board and a second circuit board are designed separately. The first circuit board serves as an adapter board, and the potentiometer is installed on the first circuit board. The second circuit board is arranged perpendicular to the first circuit board, which changes the previous assembly method of first installing the main circuit board and then installing the first knob. The present invention realizes the installation of the first circuit board first, then the first knob, and finally the second circuit board, avoiding the obstruction of the line of sight by the second circuit board when installing the first knob, thereby realizing the visual assembly of the first knob and the potentiometer. The operator can clearly observe the matching status of the locator and the first knob, which greatly improves the assembly accuracy of the first knob, and also greatly reduces the probability of damage to the first knob or the potentiometer due to blind installation.

[0049] 2. The photoelectric sensor and assembly method thereof provided by the present invention are based on the design of the first circuit board and the second circuit board, thereby postponing the assembly process of the second circuit board and the third circuit board, and further postponing the cable threading and welding processes. Only the threading, gluing, and welding processes need to be performed before assembling the cover body, thereby optimizing the assembly process and improving assembly efficiency. It avoids the need to install the circuit boards and weld the cables in the early assembly, thereby avoiding the disadvantage of needing to pull the cables throughout the subsequent assembly process, which is not conducive to transportation on the production line.

[0050] 3. The photoelectric sensor and assembly method provided by the present invention have a cable clip shell and a cable jacket that are injection-molded as one, which can ensure that there is no gap between the cable and the shell, and can improve the sealing effect of the cable circumference; at least one side wall of the shell has a locking structure with a locking protrusion or a locking groove, which is suitable for matching and locking with the sensor shell, thereby improving assembly accuracy; the sensor shell has a accommodating groove for accommodating the shell, and the accommodating groove is a separate cavity, which is connected to the inner cavity of the shell through an opening to guide the insertion of the internal wire. The interior of the accommodating groove can be completely filled with sealant and the opening is sealed, thereby improving the sealing effect of the photoelectric sensor and avoiding the existing problem of individual threading and then glue dispensing, which has uneven glue dispensing and reduced sealing.

[0051] 4. The photoelectric sensor and assembly method thereof provided by the present invention have an elastic arm extending from the outside of the bracket body for mounting the receiving lens. The first knob can be positioned by directly passing through the positioning portion of the elastic arm. There is no need to set up a separate process for clamping the retaining spring, thereby simplifying the assembly and saving the labor cost and material cost of making the retaining spring.

[0052] 5. The photoelectric sensor and assembly method thereof provided by the present invention are as follows: the rod-shaped main body of the first knob has a convex shoulder outer ring; in the process of the convex shoulder outer ring passing through the positioning portion, the convex shoulder outer ring has a large width, which generates an extrusion pressure on the positioning portion, causing the elastic arm to expand outward; after the convex shoulder outer ring passes through, the elastic arm retracts inward under the action of the elastic restoring force, thereby positioning the first knob, and the operation is simple; the positioning portion of the elastic arm has a first stop surface, and the convex shoulder outer ring of the first knob has a second stop surface matching the first stop surface; after the convex shoulder outer ring passes through the positioning portion, the first knob can be prevented from falling off by the cooperation of the first stop surface and the second stop surface; no matter whether the first knob is rotated or pulled by external force, the first knob will not be pulled out from the positioning portion due to the blocking effect of the first stop surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0054] Figure 1 Schematic diagram of the photoelectric sensor provided in the embodiment of the present invention Figure 1 ;

[0055] Figure 2 Schematic diagram of the photoelectric sensor provided in the embodiment of the present invention Figure 2 ;

[0056] Figure 3 Schematic diagram of the internal structure of the photoelectric sensor provided in an embodiment of the present invention Figure 1 ;

[0057] Figure 4 Schematic diagram of the internal structure of the photoelectric sensor provided in an embodiment of the present invention Figure 2 ;

[0058] Figure 5 Schematic diagram of the internal structure of the photoelectric sensor provided in an embodiment of the present invention Figure 3 ;

[0059] Figure 6 Schematic diagram of the internal structure of the photoelectric sensor provided in an embodiment of the present invention Figure 4 ;

[0060] Figure 7 Schematic diagram of the internal structure of the photoelectric sensor provided in an embodiment of the present invention Figure 5 ;

[0061] Figure 8 Schematic diagram of the internal structure of the photoelectric sensor provided in an embodiment of the present invention Figure 6 ;

[0062] Figure 9 Schematic diagram of the internal structure of the photoelectric sensor provided in an embodiment of the present invention Figure 7 ;

[0063] Figure 10 Schematic diagram of the internal structure of the photoelectric sensor provided in an embodiment of the present invention Figure 8 ;

[0064] Figure 11 Schematic diagram of the internal structure of the photoelectric sensor provided in an embodiment of the present invention Figure 9 ;

[0065] Figure 12 A schematic diagram of the connection between the first circuit board and the second circuit board provided in an embodiment of the present invention;

[0066] Figure 13 This is a schematic diagram of the installation of the copper sheet and the second circuit board, the third circuit board, and the fourth circuit board provided in an embodiment of the present invention;

[0067] Figure 14 Schematic diagram of the housing of the photoelectric sensor provided in the embodiment of the present invention Figure 1 ;

[0068] Figure 15 Schematic diagram of the housing of the photoelectric sensor provided in the embodiment of the present invention Figure 2 ;

[0069] Figure 16 A schematic diagram of a cable clip provided in an embodiment of the present invention;

[0070] Figure 17 Schematic diagram of the first knob provided in an embodiment of the present invention Figure 1 ;

[0071] Figure 18 Schematic diagram of the first knob provided in an embodiment of the present invention Figure 2 .

[0072] Description of reference numerals:

[0073] 1-cover, 2-housing, 21-first positioning post, 22-guide plate, 23-mounting slot, 24-light hole, 25-locking groove, 26-accommodating groove, 27-second positioning post, 28-cover, 29-opening, 3-cable buckle, 31-encapsulation, 311-locking protrusion, 4-receiving lens, 5-emitting lens, 6-bracket body, 61-side rib, 62-middle rib, 7-second circuit board, 71-first positioning hole, 72-light source, 73-first slot, 8-first knob, 81-shoulder outer ring, 811-second anti-retraction surface, 812-second guide inclined surface, 82-first sealing ring, 9-elastic arm, 91-positioning surface, 92-first anti-retraction surface, 93-first guide inclined surface, 94-elastic support ear, 10-third circuit board, 101-second positioning hole, 11-shielding circuit board, 12-fourth circuit board, 13-copper sheet, 131-copper bottom plate, 132-copper side plate, 14-first circuit board, 141-protrusion, 15-potentiometer, 16-second knob, 161-second sealing ring, 162-circuit spring. DETAILED DESCRIPTION

[0074] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0075] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0076] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0077] Example 1

[0078] This embodiment provides a photoelectric sensor. It should be noted that it is applicable to a reflective photoelectric sensor, and can also be applicable to other types of photoelectric sensors, such as a photoelectric transmitter or a photoelectric receiver. For the convenience of introduction, this embodiment takes a reflective photoelectric sensor as an example. Figure 1-18 As shown, the photoelectric sensor includes a cover 1, a shell 2 and a cable clamp 3. The cover 1 is covered on the top of the shell 2, and the cable clamp 3 is located on the side wall of the shell 2. The cover 1, the shell 2 and the cable clamp 3 form a sealed photoelectric sensor housing, in which other components are installed.

[0079] The photoelectric sensor provided in this embodiment is as follows: Figure 3 As shown, it includes a lens bracket, a receiving lens 4, and a transmitting lens 5, wherein the lens bracket includes a bracket body 6, and the receiving lens 4 is mounted on the bracket body 6, wherein the bracket body 6 and the receiving lens 4 can be snap-connected, for example, a snap is provided on the edge of the receiving lens 4, and a slot corresponding to the snap is provided on the bracket body 6, thereby realizing the snap connection between the bracket body 6 and the receiving lens 4; or, a snap is provided on the bracket body 6 and a corresponding slot is provided on the receiving lens 4; the transmitting lens 5 is not installed in the form of bracket installation, but is directly integrated into the shell 2 by means of gluing, which can reduce the structural complexity of the shell 2, thereby reducing the complexity of the production mold and facilitating manufacturing; of course, in other optional embodiments, the transmitting lens 5 can also be installed in the shell 2 by means of bracket installation; optionally, the overall structure of the bracket body 6 can be square.

[0080] It should be noted that in other types of photoelectric sensors, the lens settings may be different. For example, if the photoelectric transmitter only has a transmitting lens, it is only necessary to install the transmitting lens on the bracket body; and if the photoelectric receiver only has a receiving lens, it is only necessary to install the receiving lens on the bracket body.

[0081] The photoelectric sensor provided in this embodiment is as follows: Figure 6-9 As shown, the lens holder further comprises at least two elastic arms 9, which are arranged on an outer side wall of the holder body 6 (eg Figure 6-9 (shown as the left side wall in the figure), the elastic arm 9 extends outward from the outer side wall, and the elastic arm 9 has a positioning portion extending inward. A plurality of elastic arms 9 gather together to form an integral elastic positioning claw structure, and the inward extension refers to the elastic arm 9 extending toward the gathering side; optionally, the number of elastic arms 9 is two, and in other alternative embodiments, the number of elastic arms can be three or more; optionally, the material of the elastic arm 9 can be plastic, for example, ABS plastic or PC plastic; the elastic arm 9 and the bracket body 6 can be integrally injection molded, which can save assembly steps.

[0082] The photoelectric sensor provided in this embodiment further includes a first knob 8, a first circuit board 14 and a potentiometer 15. The potentiometer 15 can adjust the sensitivity of the sensor. The first knob 8 cooperates with the potentiometer 15. By rotating the first knob 8, the potentiometer 15 rotates, thereby achieving adjustment. Figure 7-8 As shown, the positioning portion of the elastic arm 9 has a positioning surface 91 at the head in the convergence direction thereof, and the first knob 8 has a head and a rod-shaped body, the rod-shaped body passes through the positioning surface 91 and is located between multiple positioning surfaces 91; the first circuit board 14 is located between the rod-shaped body and the outer side wall, and the potentiometer 15 is installed on the first circuit board 14 and faces the rod-shaped body. The position of the potentiometer 15 corresponds to the position of the rod-shaped body; optionally, the adjustment end of the rod-shaped body is provided with one or more adjustment protrusions, and the potentiometer 15 is provided with an adjustment groove corresponding to the adjustment protrusion. Preferably, as shown in FIG. Figure 18 As shown, the adjusting end of the rod-shaped body is provided with a cross-shaped adjusting protrusion, so as to match with the cross-shaped adjusting groove on the potentiometer 15.

[0083] The photoelectric sensor provided in this embodiment has an elastic arm 9 extending from the bracket body 6. The first knob 8 can be positioned by directly passing through the positioning portion of the elastic arm 9. There is no need to set up a separate process for clamping the retaining spring, thereby simplifying the assembly and saving the labor cost and material cost of making the retaining spring.

[0084] The photoelectric sensor provided in this embodiment is as follows: Figure 17-18As shown, the rod-shaped body of the first knob 8 has a convex outer ring 81 with an increased radial width; optionally, the overall shape of the rod-shaped body is cylindrical, and the overall shape of the convex outer ring 81 is also cylindrical, and the convex outer ring 81 is increased relative to the diameter of the rod-shaped body; in other alternative embodiments, the rod-shaped body and the convex outer ring 81 can also be in the shape of a square cylinder, a triangular cylinder, etc.; in the process of the convex outer ring 81 passing through the positioning portion, due to its large width, it generates an extrusion force on the positioning portion, causing the elastic arm 9 to expand outward, and after the convex outer ring 81 passes through, the elastic arm 9 The arm 9 retracts inward under the action of the elastic restoring force, thereby positioning the first knob 8, which is easy to operate; and the positioning portion of the elastic arm 9 has a first stop surface 92, and the first end of the boss outer ring 81 of the first knob 8 has a second stop surface 811 that cooperates with the first stop surface 92. After the boss outer ring 81 passes through the positioning portion, the first knob 8 can be prevented from falling off by the cooperation of the first stop surface 92 and the second stop surface 811. Regardless of whether the first knob 8 is rotated or pulled by external force, it will not be pulled out of the positioning portion due to the blocking effect of the first stop surface.

[0085] The photoelectric sensor provided in this embodiment is as follows: Figure 6 , as shown in 11-12, it also includes a second circuit board 7, the second circuit board 7 is perpendicular to the first circuit board 14, the top of the first circuit board 14 has a protrusion 141 extending upward, and the second circuit board 7 has a first slot 73 that matches the protrusion 141; the positioning between the first circuit board 14 and the second circuit board 7 is achieved by plugging and matching the protrusion 141 and the first slot 73; compared with the existing method of directly installing the potentiometer on the second circuit board, in this embodiment, a first circuit board 14 perpendicular to the second circuit board 7 is separately provided to install the potentiometer 15, and the first circuit board 14 actually plays the role of an adapter plate. Therefore, during the assembly process, the first circuit board 14 and the potentiometer 15 can be assembled first, and then the first knob 8 can be installed. At this time, there is no second circuit board blocking the line of sight at the top, and the first knob 8 can be assembled in coordination with the potentiometer 15 in a visual state. After the first knob 8 is assembled, the second circuit board 7 can be assembled. The above assembly method avoids the blind installation disadvantage of first installing the entire second circuit board and potentiometer, and then installing the first knob. The operator can clearly observe the coordination status of the locator and the first knob, which greatly improves the assembly accuracy of the first knob, and also greatly reduces the probability of damage to the first knob or potentiometer due to blind installation.

[0086] Since a photoelectric sensor has many electrical components such as chips that need to be installed, it would be too crowded if all of them were mounted on the second circuit board. Even if the area of ​​the second circuit board is designed to be larger to avoid crowding, this would still lead to an unreasonable increase in the overall size of the photoelectric sensor. The reflective photoelectric sensor provided by the present invention, such as Figure 4-5 As shown, the sensor further includes a third circuit board 10, which is located above the second circuit board 7. Specifically, the third circuit board 10 is arranged parallel to the second circuit board 7. The third circuit board 10 is arranged above the second circuit board 7. This allows for more components to be mounted while minimizing the space required. The addition of a circuit board layer in the height direction does not occupy much additional space in the length or width directions, making the sensor compact and small overall. Of course, those skilled in the art will understand that the third circuit board is not required and can be omitted if the second circuit board can meet the mounting requirements.

[0087] The photoelectric sensor provided in this embodiment further includes a fourth circuit board 12, such as Figure 5 As shown, the fourth circuit board 12 is connected to the side end surface of the second circuit board 7 and the side end surface of the third circuit board 10; the fourth circuit board 12 serves as a connecting board, electrically connecting the second circuit board 7 and the third circuit board 10, thereby achieving circuit connectivity between the second circuit board 7 and the third circuit board 10. It should be noted that if the third circuit board 10 is not required, the fourth circuit board 12 is also not required.

[0088] The photoelectric sensor provided in this embodiment is as follows: Figure 16 As shown, the cable clip includes a cable 32 and a shell 31. The cable 32 includes an internal conductor and a jacket surrounding the internal conductor. The shell 31 and the jacket are injection-molded as one piece. The internal conductor is passed through the shell 31 and extends toward the inside of the shell 31. Figure 15As shown, the housing 2 is provided with a receiving groove 26 for accommodating the shell 31. At least one sidewall of the shell 31 has a locking protrusion 311, and the inner sidewall of the receiving groove 26 has a locking groove 25 corresponding to the locking protrusion 311, thereby improving assembly accuracy. In an alternative embodiment, a locking groove can also be provided on the sidewall of the shell 31, and a locking protrusion can be provided on the inner sidewall of the receiving groove 26. The receiving groove 26 communicates with the inner cavity of the housing 2 through an opening 29. The internal wires extending into the inner side of the shell 31 extend into the inner cavity of the housing 2 through this opening 29. The receiving groove 26 is filled with sealant, which seals the opening 29. The receiving groove 29 is a separate cavity that communicates with the inner cavity of the housing 2 through an opening 29 to guide the internal wires. The interior of the receiving groove 26 can be completely filled with sealant, and the opening 29 is sealed, thereby improving the sealing effect of the photoelectric sensor. And it avoids the existing problem of glue dispensing after threading separately, which causes uneven glue dispensing and reduced sealing.

[0089] The photoelectric sensor provided in this embodiment is as follows: Figure 3-5 As shown, a shielding circuit board 11 is provided between the second circuit board 7 and the third circuit board 10. Specifically, the shielding surface of the shielding circuit board 11 is provided parallel to the second circuit board 7 and the third circuit board 10, and is used to shield signal interference between the second circuit board 7 and the third circuit board 10. The shielding circuit board 11 is provided with a second slot that cooperates with the protrusion 141, thereby facilitating the positioning and installation of the shielding circuit board 11. Optionally, the shielding circuit board 11 can be an FPC with good bending properties, and its end bends and extends along the side of the second circuit board 7 and is fixed to the lower surface of the second circuit board 7, thereby better achieving the installation and fixation of the shielding circuit board 11. The end of the FPC can be fixed to the lower surface of the second circuit board 7 by welding. In other optional embodiments, the end of the FPC can also be fixed to other locations on the second circuit board 7, such as the upper surface or side of the second circuit board 7. It should be noted that if the third circuit board 10 is not required, the shielding circuit board 11 is accordingly not required.

[0090] The photoelectric sensor provided in this embodiment is as follows: Figure 3-4 As shown, the reflective photoelectric sensor further includes a copper sheet 13, specifically, as Figure 13As shown, the copper sheet 13 is U-shaped, and includes a copper bottom plate 131 and copper side plates 132 located on both sides of the copper bottom plate 131. The copper bottom plate 131 is located below the second circuit board 7, and the copper side plates 132 on both sides are respectively located on both sides of the second circuit board 7 and extend to the top of the third circuit board 10, respectively. The copper side plate 132 on one side is located on the outside of the fourth circuit board 12. The copper sheet 13 serves as a shielding plate for the second circuit board 7 and the third circuit board 10, which can prevent the second circuit board 7 and the third circuit board 10 from being affected by external electromagnetic interference.

[0091] The photoelectric sensor provided in this embodiment is as follows: Figure 7-8 As shown, the positioning surface 91 of the elastic arm 9 is an inner concave surface extending axially along the rod-shaped body, and the inner concave surface is adapted to the shape of the convex shoulder outer ring 81 to ensure that the convex shoulder outer ring 81 can pass through the inner concave surface smoothly; optionally, when the convex shoulder outer ring 81 is cylindrical, the inner concave surface can be designed as an arc surface.

[0092] The photoelectric sensor provided in this embodiment is as follows: Figure 8 As shown, the positioning portion of the elastic arm 9 also has a first guide bevel 93 extending from the positioning surface 91 to the side opposite to the bracket body 6, and the second end of the boss outer ring 81 has a second guide bevel 812 that cooperates with the first guide bevel 93. The design of the guide bevel can make it easier for the boss outer ring 81 to pass through the positioning portion.

[0093] The photoelectric sensor provided in this embodiment is as follows: Figure 6-9 As shown, the elastic arm 9 is provided with an elastic ear 94 extending outward, that is, the elastic ear 94 extends toward the expansion side of the elastic arm 9, and the elastic ear 94 can abut against the inner wall of the shell 2, thereby providing a certain elastic supporting force for the elastic arm 9; optionally, the elastic ear 94 can be made of plastic, for example, ABS plastic or PC plastic; the elastic arm 9 and the elastic ear 94 can be integrally injection molded, thereby facilitating assembly; the shape of the elastic arm 9 can be a hook shape, or a straight shape, a wavy shape, etc.

[0094] The photoelectric sensor provided in this embodiment is as follows: Figure 6-7 As shown, a limiting surface for limiting the first circuit board 14 is provided at the root of its elastic arm 9, and a chamfer is also provided on the top of the limiting surface to facilitate the installation of the first circuit board 14; the outer side wall of the bracket body 6 is provided with at least two side ribs 61, and the side ribs 61 are in contact with the first circuit board 14 and are arranged opposite to the limiting surface. The first circuit board 14 is clamped between the limiting surface and the side ribs 61, and effective positioning of the first circuit board 14 is achieved through the limiting surface and the side ribs 61.

[0095] The photoelectric sensor provided in this embodiment is further provided with at least one middle rib 62 on the outer side wall of the bracket body 6. The middle rib 62 is located between the side ribs 61. The position of the middle rib 62 corresponds to the position of the potentiometer 15. Figure 9 As shown, the protruding depth of the middle rib 62 is smaller than the protruding depth of the side rib 61; since a certain extrusion pressure will inevitably be generated on the first circuit board 14 during the process of assembling the first knob 8 onto the potentiometer 15 and rotating the first knob 8 to adjust the potentiometer 15, the difference in protruding depth between the side rib 61 and the middle rib 62 can allow the first circuit board 14 to generate a certain deflection buffer under the action of the extrusion pressure, thereby preventing the first circuit board 14 from being damaged due to excessive force; optionally, the first circuit board 14 can be an FPC, which can allow a certain degree of deformation and facilitate assembly and coordination with other components; optionally, the number of the middle rib 62 is one, the number of the side ribs 61 is two, and the two side ribs 61 are respectively located on both sides of the middle rib.

[0096] In the photoelectric sensor provided in this embodiment, the side ribs 61 and the middle ribs 62 extend longitudinally along the outer side wall, and the ends of the side ribs 61 and the middle ribs 62 are both arc-shaped, thereby forming line contact with the first circuit board 14. Compared with surface contact, line contact can make it easier to install the first circuit board 14.

[0097] The photoelectric sensor provided in this embodiment is as follows: Figure 14As shown, a plurality of first positioning posts 21, at least one second positioning post 27, and a plurality of guide plates 22 are provided in the shell 2. The first positioning post 21 passes through the second circuit board 7, and the second positioning post 27 passes through the third circuit board 10. A first positioning hole 71 corresponding to the first positioning post 21 is provided on the second circuit board 7. The assembly guidance and positioning of the second circuit board 7 are achieved through the first positioning post 21 and the first positioning hole 71. A second positioning hole 101 corresponding to the second positioning post 27 is provided on the third circuit board 10. The assembly guidance and positioning of the third circuit board 10 are achieved through the second positioning post 27 and the second positioning hole 101. The guide plate 22 abuts against the bracket body 6 to achieve assembly guidance and positioning of the bracket body 6; wherein the first positioning post 21 and the second positioning post 27 are both hot-melt posts, which, on the one hand, play a role of guiding and positioning. On the other hand, after the second circuit board 7 and the third circuit board 10 are installed, the first positioning post 21 and the second positioning post 27 are hot-melt posts. The first and second positioning posts 21 and 27 are fixed to the housing. In this embodiment, the second circuit board 8 and the lens holder are both positioned relative to the housing 15, thereby effectively ensuring the assembly accuracy between the second circuit board 8 and the lens holder and avoiding errors. Optionally, there are three first positioning posts 21 and three first positioning holes 71, two of which are located at both ends of one side of the second circuit board 7, forming a triangular distribution structure with the first positioning hole 71 located in the middle of the other side of the second circuit board 7, thereby achieving stable positioning. Optionally, there is one second positioning post 27 and one second positioning hole 101, which is located at a corner of the third circuit board 10. Since the second circuit board 7 is already firmly positioned, the third circuit board 10 is connected to the second circuit board 7 via the fourth circuit board 12. Therefore, the third circuit board 10 can be guided and positioned using one positioning hole. Optionally, there are four guide plates 22, which are respectively located at the four corners inside the housing 2. It should be noted that if the third circuit board 10 is not required, the second positioning hole and the second positioning post are also not required.

[0098] The photoelectric sensor provided in this embodiment is as follows: Figure 12 As shown, a light source 72 corresponding to the emitting lens 5 is also mounted on the lower surface of the second circuit board 7. Figure 14 As shown, the housing 2 is provided with a mounting groove 24 for accommodating the light source 72, and the mounting groove 24 is provided with a light hole 24 for transmitting light from the light source 72. Of course, those skilled in the art will appreciate that the arrangement of the light source may vary in photoelectric sensors such as photoelectric transmitters or photoelectric receivers. For example, in a photoelectric transmitter, the positions of the light source, mounting groove, and light hole need to be adaptively adjusted to correspond to the position of the transmitting lens, while in a photoelectric receiver, a light source, mounting groove, and light hole are not required.

[0099] The photoelectric sensor provided in this embodiment is as follows: Figure 2 As shown, a second knob 16 is installed on the cover body 1. The second knob 16 serves as a function switching knob to switch the sensor between a state in which the sensor outputs when receiving a signal and a state in which the sensor is turned off when receiving a signal. A retaining spring 161 is provided on the outer side of the shaft of the second knob 16.

[0100] The photoelectric sensor provided in this embodiment is provided with a first sealing ring 82 on the outside of the rod-shaped body of the first knob 8, and a second sealing ring 162 on the outside of the rod body of the second knob 16, thereby ensuring the sealing effect of the sensor; a through groove is provided at the bottom of the shell 2, and a cover plate 28 is installed on the through groove to facilitate the assembly of the internal components of the shell. The cover plate 28 is welded and sealed in the later stage of assembly.

[0101] Example 2

[0102] Based on the structure of the photoelectric sensor in Example 1, this embodiment provides a method for assembling a photoelectric sensor. It should be noted that this method is applicable to reflective photoelectric sensors, but can also be applied to other types of photoelectric sensors, such as photoelectric transmitters or photoelectric receivers. For ease of description, this embodiment uses a reflective photoelectric sensor as an example.

[0103] The assembly method comprises the following steps:

[0104] S10, installing the receiving lens 4 on the bracket body 6, and then installing the lens bracket into the housing 2 along the guide plate 22;

[0105] S20, installing the first circuit board 14 on which the potentiometer 15 is installed on the lens bracket;

[0106] S30, passing the first knob 8 through the housing 2 and aligning it with the potentiometer 15;

[0107] S40, passing the second circuit board 7 through the first positioning column 21, and then installing the second circuit board 7 above the lens bracket;

[0108] S50, passing the third circuit board 10 through the second positioning column 27, and then installing the third circuit board 10 above the second circuit board 7;

[0109] S60 , matching the locking protrusion or locking groove of the enclosure 31 with the locking structure of the receiving groove 26 , thereby installing the cable clip 3 on the housing 2 .

[0110] The assembly method of the reflective photoelectric sensor provided in this embodiment changes the previous assembly method in which the potentiometer is directly fixed on the main circuit board of the sensor and the main circuit board must be installed first and then the first knob. This embodiment realizes the installation of the first circuit board first, then the first knob, and finally the second circuit board, avoiding the second circuit board blocking the line of sight when installing the first knob, thereby realizing the visual assembly of the first knob and the potentiometer. The operator can clearly observe the matching status of the locator and the first knob, which greatly improves the assembly accuracy of the first knob and also greatly reduces the probability of damage to the first knob or the potentiometer due to blind installation. Moreover, based on the design of the first circuit board and the second circuit board, the assembly process of the second circuit board and the third circuit board is postponed, thereby making the cable threading and welding process postponed. Only the threading, gluing and welding processes need to be performed before assembling the cover body, thereby optimizing the assembly process and improving assembly efficiency, avoiding the need to install the circuit board and weld the cable in the early assembly, thereby avoiding the disadvantage of pulling the cable during the subsequent entire assembly process, which is not conducive to transportation on the production line.

[0111] Optionally, the step S40 further includes: plugging the first circuit board 14 and the second circuit board 7 together by engaging the protrusion 141 with the first slot 73 .

[0112] Optionally, in step S30, the first sealing ring 82 is first installed on the rod-shaped body of the first knob 8, and then the boss outer ring 81 of the first knob 8 is passed through the positioning surface 91 of the at least two elastic arms 9, and then the first knob 8 and the potentiometer 15 are aligned and assembled; specifically, the operator can directly observe the matching status of the locator 15 and the first knob 8 from above, align the cross-shaped adjustment protrusion of the first knob 8 with the cross-shaped adjustment groove of the potentiometer 15, and then rotate it a certain angle after alignment to ensure that it is assembled in place.

[0113] Optionally, in step S10, the elastic ear 94 of the lens holder abuts against the inner wall of the shell 2, thereby providing a certain elastic supporting force for the elastic arm 9. In step S30, when the first knob passes through the positioning surface of the elastic arm, the elastic ear 94 can make the elastic arm 9 rebound quickly to achieve positioning.

[0114] Optionally, in step S20 , the first circuit board 7 is inserted along the limiting surface at the root of the elastic arm 9 between the limiting surface and the side rib 61 , thereby achieving installation and positioning of the first circuit board 14 on the lens holder.

[0115] Optionally, between step S30 and step S40, step S31 is also included: installing the copper sheet 13 on the lens bracket, and placing the copper base plate 131 of the copper sheet 13 on the upper surface of the lens bracket; in step S40, installing the second circuit board 7 above the copper base plate 131.

[0116] Optionally, the step S50 further includes the steps of:

[0117] S510, installing the shielding circuit board 11 above the second circuit board 7;

[0118] S520, connecting the fourth circuit board 12 to the side end surface of the second circuit board 7;

[0119] S530 , connecting the side end surface of the third circuit board 10 to the fourth circuit board 12 .

[0120] Optionally, in step S510 , the second slot of the shielding circuit board 11 is plugged into the protrusion 141 , and the end of the shielding circuit board 11 is fixed to the lower surface of the second circuit board 7 by welding.

[0121] Optionally, in step S520 and step S530, the fourth circuit board 12 is connected to the side end surface of the second circuit board 7 and the side end surface of the third circuit board 10 by welding.

[0122] Optionally, between step S520 and step S530, step S521 is also included, and the first positioning column 21 is protruded from the top of the second circuit board 7 and hot-melted, thereby fixing the second circuit board 7 in the shell 2; after step S530, step S540 is also included, and the second positioning column 27 is protruded from the top of the third circuit board 10 and hot-melted, thereby fixing the third circuit board 10 in the shell 2.

[0123] Optionally, the step S60 further includes: passing the internal wire through the opening 29 and extending it into the inner cavity of the housing 2 .

[0124] Optionally, in step S60, the locking protrusion 311 of the shell 31 is matched with the locking groove 25 of the accommodating groove 26, so that the cable clip 3 is installed on the shell 2; in an alternative embodiment, the locking groove of the shell 31 can also be matched with the locking protrusion of the accommodating groove 26.

[0125] Optionally, the step S60 further includes the following steps:

[0126] S70, soldering the fourth circuit board 12, the copper side plate 132 of the copper sheet 13, and the inner wires of the cable 32 to the third circuit board 10 respectively;

[0127] S80, filling the accommodating groove 26 with sealant;

[0128] S90, placing the cover body 1 equipped with the second knob 16 on the shell 2, installing the cover plate 28 at the bottom through groove of the shell 2, and welding the connection between the cover body 1, the cover plate 28 and the shell 2.

[0129] Optionally, the welding in steps S70 and S90 is ultrasonic welding; before step S90, the second knob 16 may be pre-installed with the second sealing ring 162 and the retaining spring 161, and the pre-installation process may be performed in parallel with the step before step S90; in addition, before step S90, the emitting lens 5 is also pre-installed in the shell 2 by dispensing, and the process may also be performed in parallel with the step before step S90, and can be flexibly performed according to the actual situation of the production line.

[0130] Optionally, in step S90, before ultrasonic welding, an air gun is used to blow away the dust in the inner cavity of the shell, especially the dust attached to the transmitting lens and the receiving lens. Since ultrasonic welding is the last step to seal the sensor, the interior should be kept clean to ensure the accuracy of the sensor.

[0131] It should be noted that in the above steps, for certain types of photoelectric sensors, the third circuit board 10 is not necessary. When the second circuit board 7 can meet the mounting requirements, the third circuit board can be omitted. In this case, there is no need to install the third circuit board in step S50, nor is there a need to install the shielding circuit board and the fourth circuit board in steps S510 and S520. In the subsequent step S70, the copper side plates of the copper sheet and the internal wires of the cable are soldered to the second circuit board 7.

[0132] It should be noted that in other types of photoelectric sensors, the lens arrangement may vary. For example, if a photoelectric transmitter only has a transmitting lens, then only the transmitting lens needs to be installed on the bracket body; whereas, if a photoelectric receiver only has a receiving lens, then only the receiving lens needs to be installed on the bracket body. Therefore, when the above steps are applied to a photoelectric transmitter or a photoelectric receiver, the lens installation needs to be adaptively adjusted. Only one of the transmitting lens or the receiving lens needs to be installed. For example, for a photoelectric transmitter, in step S10, the transmitting lens is installed on the bracket body; for a photoelectric receiver, in step S10, the receiving lens is installed on the bracket body.

[0133] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A photoelectric sensor, characterized in that: include: A lens holder, comprising a holder body and at least two elastic arms, wherein the elastic arms extend outward from an outer side wall of the holder body, the elastic arms have positioning portions extending inward, and the heads of the positioning portions have positioning surfaces; A receiving lens, wherein the receiving lens is mounted on the bracket body; a first circuit board mounted on the lens bracket, wherein the first circuit board is located outside the bracket body; a potentiometer, mounted on the first circuit board; a first knob, corresponding to the position of the potentiometer, the first knob having a rod-shaped body, the rod-shaped body being located between the positioning surfaces of the elastic arms, and the potentiometer facing the rod-shaped body; The second circuit board is located above the lens support, and the second circuit board is perpendicular to the first circuit board.

2. The photoelectric sensor according to claim 1, wherein: The photoelectric sensor further comprises a cable clip, wherein the cable clip comprises: A cable comprising an inner conductor and a jacket surrounding the inner conductor; The shell is injection-molded as a whole with the outer shell; the internal wire is passed through the shell and extends toward the inside of the shell.

3. The photoelectric sensor according to claim 2, wherein: The photoelectric sensor also includes a shell, in which a plurality of first positioning columns and a plurality of guide plates are arranged, the second circuit board is provided with a plurality of first positioning holes corresponding to the first positioning columns, and the guide plates are in contact with the bracket body; the shell is provided with a receiving groove for accommodating the shell.

4. The photoelectric sensor according to claim 3, wherein: At least one side wall of the shell has a locking protrusion or a locking groove, the inner side wall of the accommodating groove has a locking structure corresponding to the locking protrusion or the locking groove, the accommodating groove is connected to the inner cavity of the shell through an opening, and the internal wire extends into the inner cavity of the shell through the opening.

5. The photoelectric sensor according to claim 4, characterized in that The top of the first circuit board is provided with a protrusion extending upward, and the second circuit board is provided with a first slot matched with the protrusion.

6. The photoelectric sensor according to claim 5, characterized in that The photoelectric sensor also includes a third circuit board and a fourth circuit board, the third circuit board is located above the second circuit board, and the fourth circuit board is connected to the side end surface of the second circuit board and the side end surface of the third circuit board; at least one second positioning column is provided in the shell, and at least one second positioning hole corresponding to the second positioning column is provided on the second circuit board.

7. The photoelectric sensor according to claim 6, characterized in that A shielding circuit board is provided between the second circuit board and the third circuit board, and a second slot matched with the protrusion is provided on the shielding circuit board.

8. The photoelectric sensor according to claim 7, characterized in that The shielding circuit board is an FPC, an end of which is bent and extended along the side surface of the second circuit board and fixed to the lower surface of the second circuit board.

9. The photoelectric sensor according to claim 8, characterized in that The photoelectric sensor also includes a copper sheet, which is U-shaped and includes a copper base plate and copper side plates located on both sides of the copper base plate. The copper base plate is located below the second circuit board, and the copper side plates on both sides are respectively located on both sides of the second circuit board and extend to the top of the third circuit board respectively. One of the copper side plates is located on the outside of the fourth circuit board.

10. The photoelectric sensor according to claim 9, characterized in that The positioning portion has a first stop surface on a side facing the bracket body, the rod-shaped body has a convex shoulder outer ring in the middle, and the first end of the convex shoulder outer ring has a second stop surface that matches the first stop surface.

11. The photoelectric sensor according to claim 10, wherein: The photoelectric sensor further includes a cover body; the cover body is arranged on top of the shell, and a second knob is installed on the cover body.

12. The photoelectric sensor according to claim 11, wherein: The photoelectric sensor further includes a transmitting lens mounted on the housing.

13. A method for assembling a photoelectric sensor according to claim 12, characterized in that: The steps include: S1. Install the receiving lens on the bracket body, and then install the lens bracket into the housing of the sensor; S2, installing the first circuit board with the potentiometer installed on the lens bracket; S3, passing the first knob through the housing and aligning it with the potentiometer; S4. Install the second circuit board into the housing and place it above the lens holder.

14. A method for assembling a photoelectric sensor according to claim 13, characterized in that: The steps include: S10, installing the receiving lens on the bracket body, and then installing the lens bracket into the housing along the guide plate; S20, installing the first circuit board with the potentiometer installed on the lens bracket; S30, passing the first knob through the housing and aligning it with the potentiometer; S40, passing the second circuit board through the first positioning column, and then installing the second circuit board above the lens bracket; S50, passing the third circuit board through the second positioning pillars, thereby installing the third circuit board above the second circuit board; S60: Match the locking protrusion or locking groove of the enclosure with the locking structure of the receiving groove, thereby installing the cable clip on the housing.

15. The assembly method according to claim 14, characterized in that: The step S40 further includes: plugging the first circuit board and the second circuit board together by engaging the protrusion with the first slot.

16. The assembly method according to claim 14, characterized in that: In step S30, a first sealing ring is firstly mounted on the rod-shaped body of the first knob, and then the outer collar of the first knob is passed through the positioning surfaces of the at least two elastic arms, and then the first knob is aligned and assembled with the potentiometer.

17. The assembly method according to claim 14, characterized in that: Between step S30 and step S40, step S31 is also included: installing the copper sheet on the lens bracket, with the copper base plate of the copper sheet placed on the upper surface of the lens bracket; in step S40, installing the second circuit board above the copper base plate.

18. The assembly method according to claim 17, characterized in that: The step S50 further comprises the steps of: S510, installing the shielding circuit board above the second circuit board; S520, connecting the fourth circuit board to a side end surface of the second circuit board; S530: Connect the side end surface of the third circuit board to the fourth circuit board.

19. The assembly method according to claim 18, characterized in that: In the step S510 , the second slot of the shielding circuit board is plugged into the bump, and the end of the shielding circuit board is fixed to the lower surface of the second circuit board by welding.

20. The assembly method according to claim 18, wherein: In step S520 and step S530, the fourth circuit board is connected to the side end surface of the second circuit board and the side end surface of the third circuit board by welding.

21. The assembly method according to claim 18, wherein: Between step S520 and step S530, there is also a step S521, which is to protrude the first positioning column from the top of the second circuit board and perform hot melting, thereby fixing the second circuit board in the shell; after step S530, there is also a step S540, which is to protrude the second positioning column from the top of the third circuit board and perform hot melting, thereby fixing the third circuit board in the shell.

22. The assembly method according to claim 18, wherein: The step S60 further includes: passing the internal wire through the opening and extending it into the inner cavity of the shell.

23. The assembly method according to claim 22, characterized in that: The step S60 further includes the following steps: S70, welding the fourth circuit board, the copper side plate of the copper sheet, and the inner wire of the cable to the third circuit board respectively; S80, filling the containing groove with sealant; S90, placing the cover body equipped with the second knob on the shell, installing a cover plate at the bottom through groove of the shell, and welding the connection between the cover body, the cover plate and the shell.

24. The assembly method according to claim 23, characterized in that: The welding in steps S70 and S90 is ultrasonic welding; before step S90, the second knob is pre-installed with a second sealing ring and a retaining ring, and the emitting lens is pre-installed in the housing by dispensing.

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