Method for manufacturing safety belt lock and light-emitting assembly

Abstract

A method for manufacturing a safety belt lock (100) and a light-emitting assembly (20). The safety belt lock (100) comprises: a housing (10), having an opening end (122) for insertion of a lock tongue; and a light-emitting assembly (20), comprising: a PET substrate (21), arranged circumferentially at the opening end (122) of the housing (10); a conductive circuit (22), disposed on a first side (211) of the PET substrate (21); and a plurality of LED chips (23), fixed to the PET substrate (21) and electrically connected to the conductive circuit (22). The PET substrate (21) is flexible and can be designed and made into various shapes and sizes, so as to adapt to sizes and shapes of opening ends (122) of different housings (10). The flexible PET substrate (21) can also be more easily mounted on the housing (10), thereby simplifying the assembling difficulty. The plurality of LED chips (23) are closely arranged, so that consistency of light output can be ensured, thereby facilitating uniform output and uniform illumination of light of the safety belt lock (100). The LED chip (23) is directly integrated on the PET substrate (21), simplifying the assembly process and reducing the size of the wiring harness compared to the existing technology, and therefore the volume and space occupancy can be reduced.

Description

Manufacturing method of seat belt buckle and light-emitting component Technical Field

[0001] This invention relates to the field of seat belt accessories technology, and in particular to a method for manufacturing a seat belt buckle and a light-emitting component. Background Technology

[0002] The seatbelt buckle is part of a vehicle's safety device and is fixedly attached to the vehicle body. The seatbelt is mounted on a latch, which is inserted into the buckle's slot to secure the seatbelt to the vehicle seat. When the latch is inserted, the seatbelt wraps around the passenger, thus securing the passenger to the seat during sudden vehicle deceleration.

[0003] To help passengers quickly locate the seatbelt buckle, the buckle can also be equipped with an illuminating device to indicate the area for inserting the latch. However, considering that seatbelt buckles are typically small, it is desirable for the illuminating device to have a compact structure and fewer components to accommodate limited installation space; moreover, it is desirable for the illuminating device to have an aesthetically pleasing and uniform illumination effect. Summary of the Invention

[0004] To overcome the problems existing in the related technologies, this disclosure provides a method for manufacturing a seat belt buckle and a light-emitting component.

[0005] According to a first aspect of the present disclosure, a seatbelt buckle is provided, comprising: a housing having an open end for insertion of a latch; and a light-emitting component comprising: a PET substrate disposed circumferentially at the open end of the housing; a conductive circuit disposed on a first side of the PET substrate; and a plurality of LED chips fixed to the PET substrate and electrically connected to the conductive circuit.

[0006] In some embodiments, the LED chip is soldered to the conductive circuit using low-temperature solder paste to achieve electrical connection.

[0007] In some embodiments, the conductive circuit is formed by printing silver or copper paste onto a first side of the PET substrate.

[0008] In some embodiments, the light-emitting component further includes an insulating layer and / or conductive ink for covering the conductive circuit on the PET substrate.

[0009] In some embodiments, a welding hole is pre-drilled on the first side of the PET substrate by laser cutting, and the conductive circuit covers the welding hole. The conductive circuit at the welding hole is coated with conductive ink, and the LED chip is welded to the conductive circuit at the welding hole.

[0010] In some embodiments, the housing has a narrowing section at its open end, and the housing forms a stepped surface at the narrowing section. The light-emitting component is sleeved on the outside of the narrowing section and fixed on the stepped surface.

[0011] In some embodiments, the housing is provided with an annular groove or claw on the stepped surface, and the PET substrate is secured in the groove or claw.

[0012] In some embodiments, the housing is provided with a fixing pin on the stepped surface, and the PET substrate is provided with a mounting hole. The fixing pin is inserted into the mounting hole to fix the PET substrate on the stepped surface of the housing.

[0013] In some embodiments, the housing further includes a light-transmitting cover, which is fitted over the outside of the narrowed section and forms a light-transmitting space with the stepped surface, and the light-emitting component is surrounded within the light-transmitting space.

[0014] In some embodiments, the light-emitting component further includes: a connecting plate, one end of which is connected to the PET substrate; and a connector connected to the other end of the connecting plate for connecting a power source and transmitting a signal output to the vehicle's central control unit.

[0015] In some embodiments, a plurality of the LED chips are arranged at equal intervals along the circumference of the PET substrate.

[0016] In some embodiments, the housing includes a first housing and a second housing, which are detachably connected in a direction perpendicular to the insertion of the latch, wherein the first housing is provided with the narrowing section.

[0017] According to a first aspect of the present disclosure, the present disclosure provides a method for manufacturing a light-emitting component, comprising the following steps: Step 1: Printing conductive silver paste or copper paste on a first side of a PET substrate to form a thin-film conductive circuit; Step 2: Pre-drilling welding holes on the first side of the PET substrate by laser cutting; Step 3: Applying an insulating layer and / or conductive ink to the conductive circuit to form a conductive protective layer; Step 4: Soldering the LED chip (23) onto the conductive circuit (22) at the welding holes using low-temperature solder paste; Step 5: Finishing the process after final inspection.

[0018] The technical solutions provided by the embodiments of this disclosure can include the following beneficial effects: the light-emitting component uses a PET substrate. PET substrates are more flexible than metal or PCB substrates, and can be designed and manufactured in various shapes and sizes to adapt to the size and shape of openings in different housings. The flexible PET substrate is also easier to install into the housing, simplifying assembly. The close arrangement of multiple LED chips ensures consistent light output, which is beneficial for uniform light output and illumination of the seatbelt buckle. The LEDs are directly integrated onto the PET substrate, simplifying the assembly process and reducing wiring harnesses in related technologies, thereby reducing volume and space occupation. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0020] Figure 1 is an exploded perspective view of a seatbelt buckle according to an exemplary embodiment;

[0021] Figure 2 is a perspective view of a light-emitting component according to an exemplary embodiment;

[0022] Figure 3 is an enlarged view of the structure of part A in Figure 2. Detailed Implementation

[0023] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0024] This disclosure provides a seatbelt buckle 100, which is typically fixed to the frame of a vehicle and located on the outer lower side of the seat.

[0025] As shown in Figure 1, the seatbelt buckle 100 typically includes a housing 10, a locking assembly (not shown), an unlocking assembly (not shown), and a light-emitting assembly 20. The housing 10 has an open end for inserting the locking tongue.

[0026] When the seatbelt is pulled out, the latch (not shown) inserts into the opening 122 inside the housing 10 and is acted upon by the spring force of the locking assembly inside the housing 10, thus ensuring that the latch is locked. To unlock the seatbelt, the passenger needs to press the button on the unlocking assembly, thereby releasing the pressure of the spring in the locking assembly, causing the latch to pop out of the housing 10, thus releasing the latch.

[0027] The locking component of the seatbelt buckle 100 ensures that the seatbelt buckle 100 can reliably and effectively secure the passenger to the seat in both normal use and emergency situations, preventing serious injury and protecting the passenger's safety. The unlocking component of the seatbelt buckle 100 allows the passenger to freely and quickly remove the seatbelt, ensuring convenient and quick use of the seatbelt.

[0028] The luminous component 20 is typically located at the opening 122 of the housing 10 of the seatbelt buckle 100, so that passengers can quickly spot the opening 122 and insert the latch into it in the dark or in poor visibility conditions. However, the luminous component usually requires wiring harnesses to communicate or transmit signals to other systems in the vehicle.

[0029] The luminous component 20 is typically installed near the opening end 122 of the housing 10 of the seatbelt buckle 100 so that passengers can quickly locate the opening end 122 of the buckle in low light or poor visibility conditions and accurately insert the latch into it.

[0030] However, the light-emitting component 20 typically needs to communicate or transmit signals to other systems in the vehicle via wiring harnesses. The presence of these wiring harnesses occupies space inside the seatbelt buckle 100. To accommodate the wiring harness and its corresponding connectors, the size of the seatbelt buckle 100 may be forced to increase, which contradicts the goals of compactness and lightweight design. The introduction of wiring harnesses makes the structure of the seatbelt buckle 100 more complex, increasing manufacturing difficulty and cost, and may also increase the probability of malfunction. The presence of wiring harnesses may also affect the appearance design of the seatbelt buckle 100, making it look less neat and aesthetically pleasing.

[0031] To solve the above-mentioned technical problems, the light-emitting component of the seat belt buckle 100 disclosed herein is a novel light-emitting component 20. As shown in FIG2, the light-emitting component 20 includes: a PET substrate 21, a conductive circuit 22, an LED chip 23, a connecting plate 24, and a connector 25.

[0032] The full name of the PET substrate 21 is polyethylene terephthalate substrate. The PET substrate 21 is arranged around the opening 122 of the housing 10. Compared to metal substrates, ceramic substrates, or PCB substrates, the PET substrate 21 has lower hardness and higher flexibility, allowing the light-emitting component 20 to be designed in various shapes and sizes to adapt to the specific size and shape requirements of the opening 122 of different housings 10. The flexibility of the PET substrate 21 not only provides greater design flexibility but also simplifies the installation process between the PET substrate 21 and the housing 10, reducing assembly difficulty.

[0033] Furthermore, the PET substrate 21 may include a first side 211 and a second side, the second side being used for fixing to the housing 10. It is further understood that the terms "first," "second," etc., are used to describe various structures, but these structures should not be limited to these terms. These terms are only used to distinguish structures of the same type from each other and do not indicate a specific order or degree of importance. In fact, the expressions "first," "second," etc., are completely interchangeable. For example, without departing from the scope of this disclosure, the first side 211 may also be referred to as the second side, and similarly, the second side may also be referred to as the first side 211.

[0034] In some embodiments, the conductive circuit 22 can be formed by printing silver paste or copper paste on the first side 211 of the PET substrate 21. This conductive circuit 22, printed with silver paste or copper paste, not only has a thinner thickness, better flexibility and conductivity, but also can better adapt to the bending characteristics of the PET substrate 21, avoiding breakage when the PET substrate 21 is bent.

[0035] The LED chip 23 is electrically connected to the conductive circuit 22 on the first side 211 of the PET substrate 21, so that the light emitted by the LED chip 23 is scattered in a direction away from the housing 10, thereby effectively defining the position of the opening end 122 of the housing 10 by light, ensuring that passengers can easily find the opening end 122 even in low light conditions.

[0036] Furthermore, as shown in Figure 3, the LED chip 23 is soldered to the conductive circuit 22 using low-temperature solder paste to achieve electrical connection. This not only ensures a reliable electrical connection between the LED chip 23 and the conductive circuit 22 but also simplifies the assembly process. Furthermore, the conductive circuit 22 is continuous along the length of the PET substrate 21. When multiple LED chips 23 are simultaneously soldered onto the conductive circuit 22, they are essentially connected in series on the PET substrate 21. The connecting plate 24, which is connected to the power supply, only needs to be connected to any position on the conductive circuit 22 to supply power to all the LED chips 23 on the entire PET substrate 21, simultaneously causing multiple LED chips 23 to emit light. Therefore, not only can the position of the connecting plate 24 be flexibly adjusted, but the number of wires required in traditional technologies is also reduced, thereby significantly reducing the volume and space occupied by the entire light-emitting component 20.

[0037] Furthermore, multiple LED chips 23 are arranged at equal intervals along the circumference of the PET substrate 21. The multiple LED chips 23 are arranged at equal intervals to form a uniform and continuous annular light-emitting strip that surrounds the outside of the opening end 122. This not only improves the uniformity and brightness of the light, but also facilitates the uniform output and uniform illumination of the light from the seat belt buckle 100.

[0038] Furthermore, the PET substrate 21 can be fitted over the outside of the opening 122 of the housing 10. In one embodiment, the second side of the PET substrate 21 can be fixed to the outer peripheral surface of the housing 10, such that the light emitted by the LED chip 23 on the PET substrate 21 forms a certain angle with the insertion direction of the latch, i.e., the light emitted by the LED chip 23 is not parallel to the insertion direction of the latch. This angle between the light and the insertion direction of the latch helps to reduce the amount of light directly entering the passenger's eyes, reduce glare, and improve user comfort.

[0039] In this embodiment, the light emitted by the LED chip 23 is parallel to the insertion direction of the latch, that is, the light emitted by the LED chip 23 is perpendicular to the plane where the opening end 122 is located. Specifically, as shown in FIG1, a narrowing section 121 is provided at the opening end 122 of the housing 10. The diameter of the narrowing section 121 is smaller than the size of the outer peripheral surface of the entire housing 10, and the inner peripheral surface of the narrowing section 121 defines the shape and size of the opening end 122. A step surface 123 is formed between the outer peripheral surface of the narrowing section 121 and the outer peripheral surface of the housing 10, and the step surface 123 is parallel to the plane where the opening end 122 is located. The light-emitting component 20 is sleeved on the outer peripheral surface of the narrowing section 121, and the PET substrate 21 is fixed on the step surface 123. Therefore, the first side surface 211 of the PET substrate 21 (the upper surface shown in FIG2) is parallel to the plane where the opening end 122 is located, so that the light emitted by the LED chip 23 on the PET substrate 21 is parallel to the insertion direction of the latch.

[0040] In this way, the light emitted by the LED chip 23 can be ensured to be distributed along the insertion direction of the latch, maintaining the consistency of the output direction, making the emitted light more concentrated, and ensuring that the light is brightest in the direction facing the passenger, so that the passenger can accurately and quickly find the position of the opening end 122 of the seat belt buckle 100.

[0041] The PET substrate 21 can be fixed to the outer peripheral surface of the narrow section 121, the outer peripheral surface of the housing 10, or the stepped surface 123 of the housing 10 in a variety of ways.

[0042] In this embodiment, the PET substrate 21 is fixed to the stepped surface 123 of the housing 10. In one specific embodiment, the housing 10 has an annular groove or claw on the stepped surface 123, and the PET substrate 21 can be fixed by being secured in the groove or claw. In another specific embodiment, the housing 10 has a fixing pin on the stepped surface 123, and the PET substrate 21 has a mounting hole. The fixing pin is inserted into the mounting hole to fix the PET substrate 21 to the stepped surface 123 of the housing 10.

[0043] Thus, by using the locking mechanism of the annular slots or claws, and the cooperation of the fixing pins and mounting holes, the PET substrate 21 can be installed quickly and easily, simplifying the assembly process, providing a more stable fixing effect, and ensuring that the PET substrate 21 is not prone to loosening or falling off during long-term use. The use of annular slots or claws, or a combination of fixing pins and mounting holes, allows for easy disassembly when the PET substrate 21 needs to be replaced or maintained, improving the convenience of maintenance.

[0044] It should be noted that the above methods of fixing the PET substrate 21 to the housing 10 are merely exemplary and are not intended to limit the scope of protection of this disclosure. In other embodiments, the PET substrate 21 can also be fixed to the housing 10 by means of bonding or welding, which will not be listed here.

[0045] Furthermore, in some embodiments, as shown in FIG2, the light-emitting component 20 further includes a connecting plate 24 and a connector 25. One end of the connecting plate 24 is connected to the PET substrate 21, and the other end of the connecting plate 24 is connected to the connector 25. The connecting plate 24 may also be made of PET material, and further, the connecting plate 24 is integrally formed with the PET substrate 21. The connector 25 is used to connect to a power source and transmit signals to the vehicle's central control unit as a signal output terminal.

[0046] In some embodiments, the light-emitting component 20 further includes an insulating layer and / or conductive ink for covering the conductive circuit 22 on the PET substrate 21. This results in the light-emitting component 20 having better conductivity.

[0047] Specifically, both the insulating layer and the conductive ink can cover the outside of the conductive circuit 22 to protect it. Preferably, the insulating layer can cover the non-connected areas of the conductive circuit 22 (i.e., the circuit segments not connected to the LED chip 23) to protect the conductive circuit 22, prevent short circuits, and ensure circuit safety and stability. This insulating layer is typically made of polymer materials and has good electrical insulation properties. The conductive ink can be coated on the connection areas of the conductive circuit 22 with the LED chip 23 to enhance the conductivity of the conductive circuit 22. The conductive ink typically contains metal particles, such as silver or copper, which can improve the conductivity of the circuit and ensure smooth current transmission.

[0048] By using an insulating layer and / or conductive ink on the PET substrate 21, the light-emitting component 20 can not only improve conductivity, but also ensure the safety and reliability of the circuit and extend the service life of the component.

[0049] In some embodiments, the first side 211 of the PET substrate 21 is pre-drilled with welding holes by laser cutting, and the conductive circuit 22 covers the welding holes. The conductive circuit 22 at the welding holes is coated with conductive ink, and the LED chip 23 is welded to the conductive circuit 22 at the welding holes.

[0050] By pre-drilling solder holes on the PET substrate 21, the number and position of the LED chips 23 are determined, enabling the correct soldering positions to be quickly located during the soldering process, thus improving the soldering efficiency of the LED chips 23. Furthermore, the pre-drilled solder holes reduce errors during the soldering process, ensuring that each LED chip 23 is accurately soldered to its predetermined position. This helps maintain the consistency of the light output direction of the light-emitting component, making the light from the light-emitting component 20 more uniform and improving the overall luminous performance.

[0051] Furthermore, applying conductive ink to the solder holes ensures a good electrical connection between the LED chip 23 and the conductive circuit 22, improving soldering quality. Solder holes coated with conductive ink enhance the circuit's conductivity and reduce contact resistance, thereby improving the overall electrical performance and reliability of the light-emitting assembly 20.

[0052] The manufacturing process of the light-emitting component 20 disclosed herein will be briefly described below:

[0053] Step 1: Print conductive silver paste or copper paste on the first side 211 of the PET substrate 21 to form a thin film conductive circuit 22;

[0054] Step 2: The first side 211 of the PET substrate 21 has pre-drilled welding holes by laser cutting;

[0055] Step 3: Apply an insulating layer and / or conductive ink to the conductive circuit 22 to form a conductive protective layer;

[0056] Step 4: The LED chip 23 is soldered onto the conductive circuit 22 at the soldering hole using low-temperature solder paste;

[0057] Step 5: After final inspection, the product is taken offline.

[0058] It is further understood that, although these operations are performed in the specific order or serial order shown in the embodiments of this disclosure, or all of the shown operations are required to obtain the desired result, multitasking and parallel processing may be advantageous in certain environments.

[0059] In some embodiments, as shown in FIG1, the housing 10 further includes a light-transmitting cover 11, which is fitted over the outside of the narrowed section 121 and forms a light-transmitting space with the stepped surface 123. The light-emitting component 20 is surrounded in the light-transmitting space, that is, the light-emitting component 20 is located inside the housing 10 and is protected by the housing 10, thereby effectively avoiding damage to the light-emitting component 20 caused by collision or wear.

[0060] As shown in Figure 1, the outer wall of the light-transmitting cover 11 is flush with the outer peripheral wall of the housing 10, which not only enhances the overall appearance and texture of the seat belt buckle 100, but also ensures the continuity of the tactile feel, providing passengers with a more elegant and comfortable user experience.

[0061] In some other embodiments, the light-emitting component 20 can also be directly disposed on the outside of the housing 10, thereby allowing light to shine out more directly and improving the light propagation efficiency. The position of the light-emitting component 20 can be selected according to the specific application scenario and requirements, and is not specifically limited here.

[0062] In some embodiments, as shown in FIG1, the housing 10 includes a first housing 12 and a second housing 13, which are detachably connected in a direction perpendicular to the insertion of the latch. The first housing 12 is provided with a narrowing section 121. The detachable first housing 12 and second housing 13 make it easier to install and replace other components such as locking components and unlocking components inside the housing 10.

[0063] It is understood that in this disclosure, "multiple" refers to two or more, and other quantifiers are similar. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. The singular forms "a," "the," and "the" are also intended to include the plural forms unless the context clearly indicates otherwise.

[0064] It is further understood that the terms "upper", "lower", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation.

[0065] It can be further understood that, unless otherwise specified, "connection" includes both direct connections where no other components exist between the two parties and indirect connections where other components exist between them.

[0066] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following scope of claims.

[0067] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A seat belt buckle (100), characterized in that, The safety belt buckle (100) comprises: a housing (10) having an open end (122) for insertion of a latch tongue; and a light-emitting assembly (20) comprising: a PET substrate (21) arranged circumferentially at the open end (122) of the housing (10); a conductive circuit (22) provided on a first side (211) of the PET substrate (21); and a plurality of LED chips (23) fixed to the PET substrate (21) and electrically connected to the conductive circuit (22).

2. The safety belt buckle (100) according to claim 1, wherein the LED chips (23) are soldered to the conductive circuit (22) by low-temperature tin paste to achieve electrical connection.

3. The safety belt buckle (100) according to claim 1, wherein the conductive circuit (22) is formed by printing silver paste or copper paste on the first side (211) of the PET substrate (21).

4. The safety belt buckle (100) according to claim 1, wherein the light-emitting assembly (20) further comprises an insulating layer and / or conductive ink for covering the conductive circuit (22) on the PET substrate (21).

5. The safety belt buckle (100) according to claim 1, wherein the first side (211) of the PET substrate (21) is pre-provided with a soldering hole by laser cutting, and the conductive circuit (22) covers the soldering hole, wherein the conductive circuit (22) at the soldering hole is coated with conductive ink, and the LED chips (23) are soldered to the conductive circuit (22) at the soldering hole.

6. The safety belt buckle (100) according to claim 1, wherein the open end (122) of the housing (10) is provided with a narrowed section (121), the housing (10) forms a stepped surface (123) at the narrowed section (121), the light-emitting assembly (20) is sleeved outside the narrowed section (121) and fixed to the stepped surface (123).

7. The safety belt buckle (100) according to claim 6, wherein the housing (10) is provided with an annular clamping groove or clamping jaw at the stepped surface (123), and the PET substrate (21) is clamped in the clamping groove or clamping jaw.

8. The safety belt buckle (100) according to claim 6, wherein the housing (10) is provided with a fixing pin at the stepped surface (123), and the PET substrate (21) is provided with a mounting hole, the fixing pin is inserted into the mounting hole to fix the PET substrate (21) to the stepped surface (123) of the housing (10).

9. The safety belt buckle (100) according to claim 6, wherein the housing (10) further comprises a light-transmitting cover (11) sleeved outside the narrowed section (121) and surrounding the stepped surface (123) to form a light-transmitting space, and the light-emitting assembly (20) is enclosed in the light-transmitting space. ​ ​ ​ ​ ​ ​ ​ ​ ​ 10. The seat belt buckle (100) according to claim 1, characterized in that, the light-emitting assembly (20) further comprises: a connecting plate (24), one end of which is connected with the PET substrate (21); a connector (25) connected at the other end of the connecting plate (24) for connecting a power supply and transmitting to a central control unit of the vehicle as a signal output end.

11. The seat belt buckle (100) according to claim 1, characterized in that, a plurality of the LED chips (23) are arranged at equal intervals along the circumference of the PET substrate (21).

12. The seat belt buckle (100) according to claim 6, characterized in that, the housing (10) comprises a first housing (12) and a second housing (13), which are detachably connected along a direction perpendicular to the insertion direction of the latch tongue, wherein the first housing (12) is provided with the narrowed section (121).

13. A method of manufacturing a light emitting assembly, characterized by comprising the following steps: Step one: printing conductive silver paste or copper paste on the first side (211) of the PET substrate (21) to form a thin film-like conductive circuit (22); Step two: the first side (211) of the PET substrate (21) is pre-reserved with a welding hole by laser cutting; Step three: coating an insulating layer and / or conductive ink on the conductive circuit (22) to form a conductive protective layer; Step four: the LED chip (23) is welded on the conductive circuit (22) at the welding hole by low-temperature tin paste welding; Step five: after final inspection, the product is delivered.

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