Lighted sign and method of making same

Abstract

The application relates to the technical field of automobile emblems, and provides a light-emitting emblem and a manufacturing method thereof. The light-emitting emblem comprises an emblem body, a plurality of leading-out parts are arranged on the emblem body; a plurality of groups of optical fiber bundles are arranged in an optical fiber structure matched with the shape of the emblem body, the optical fiber structure is uniformly plastic-wrapped in the interior of the emblem body, and the end part of each group of the optical fiber bundles is led out from a leading-out part; and a light-emitting light source is detachable relative to the emblem body, and the end part led out by the plurality of groups of the optical fiber bundles is connected to the light-emitting light source. According to the application, the optical fiber is embedded in the emblem body, the end part of the optical fiber is led out from the leading-out part of the emblem body, and is connected to the detachable light source, so that the emblem can emit light, and the emblem assembly is facilitated.

Description

Technical Field

[0001] This invention relates to the field of automotive logo technology, and more specifically, to a luminous sign and its manufacturing method. Background Technology

[0002] Car logos often use luminous designs to serve decorative and warning purposes. Currently, most luminous logos are achieved through backlighting; or by placing the light source on the side of the logo and reflecting it onto the logo surface; some luminous logos use light guides to direct light from other sources to the vicinity of the logo.

[0003] These existing luminous car emblems are essentially backlight-bundled, which means that the car emblem is bundled with the light source (a circuit system with light-emitting diodes). During assembly, holes that match the luminous car emblem need to be made on the vehicle parts to install the luminous car emblem.

[0004] However, illuminated car logos that use backlighting and binding methods cannot effectively balance the luminous function and the stability of the assembly.

[0005] Specifically, if a backlit binding method is used to form an luminous car logo, when it is assembled to a vehicle component, such as the airbag cover of the driver's airbag module on the steering wheel, a hole needs to be made at the logo position of the airbag cover according to the outer contour of the luminous car logo, and the luminous car logo is inserted through the back of the airbag cover to achieve installation.

[0006] This method has the drawback that the holes affect the strength of the airbag cover, making it difficult to secure the illuminated car emblem properly when the airbag deploys. If the illuminated car emblem is installed from the front of the airbag cover, the backlit emblem will be too heavy, posing a significant risk when the airbag deploys.

[0007] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0008] In view of this, the present invention provides a luminous sign and a method for manufacturing the same, wherein an optical fiber is embedded in the sign body, the end of the optical fiber extends from the lead-out part of the sign body and is connected to a detachable light source, thereby realizing the sign's illumination and facilitating sign assembly.

[0009] One aspect of the present invention provides a luminous sign, comprising: a sign body having a plurality of lead-out portions; a plurality of optical fiber bundles arranged in an optical fiber structure matching the shape of the sign body, the optical fiber structure being uniformly encapsulated inside the sign body, and the end of each set of optical fiber bundles extending from one of the lead-out portions; and a light source detachable from the sign body, the protruding ends of the plurality of optical fiber bundles being converged and connected to the light source.

[0010] In some embodiments, the luminous sign is applied to an airbag cover; the airbag cover has a through hole for mounting the lead-out portion, the sign body is mounted on the outer surface of the airbag cover, and the lead-out portion is inserted into the through hole. The airbag cover may, for example, be the airbag cover for the driver's airbag module on the steering wheel.

[0011] In some embodiments, an installation plate is provided on the inner side of the airbag cover; the installation plate is provided with a fixing hole corresponding to the through hole, and the lead-out part is inserted into the through hole and fixed to the fixing hole.

[0012] In some embodiments, the light source is mounted on the mounting plate, and the protruding ends of multiple sets of optical fiber bundles are bundled together and connected to the light source; or, the light source is mounted on the inner surface of the airbag cover, and the protruding ends of multiple sets of optical fiber bundles are bundled together and connected to the light source; or, the light source is mounted on the outside of the airbag cover, and the protruding ends of multiple sets of optical fiber bundles are bundled together and connected to the light source through a main optical fiber.

[0013] In some embodiments, the lead-out portion is a fixed post located at the bottom of the sign body.

[0014] In some embodiments, the fiber bundle is a side-emitting fiber bundle.

[0015] In some embodiments, the sign body is formed by injection molding of an injection molding compound containing scattering particles; the scattering particles include alumina particles.

[0016] In some embodiments, the outer surface of the sign body is coated with a light-transmitting surface coating by physical vapor deposition and / or screen printing; and / or, the bottom of the sign body is coated with a reflective coating by polishing.

[0017] Another aspect of the present invention provides a method for manufacturing a luminous sign, comprising: winding optical fibers into multiple sets of optical fiber bundles according to the shape of the sign, and arranging the multiple sets of optical fiber bundles into an optical fiber structure matching the shape of the sign; fixing the optical fiber structure in an injection mold; and injection molding a sign body uniformly encapsulating the optical fiber structure inside the injection mold, wherein the sign body forms multiple lead-out portions, and the end of each set of optical fiber bundles extends out from one of the lead-out portions.

[0018] In some embodiments, after forming the sign body, the method further includes: forming an airbag cover with a through hole for mounting the lead-out portion; mounting the sign body from the outer surface of the airbag cover, so that the sign body is fixed to the outer surface of the airbag cover and the lead-out portion is inserted into the through hole.

[0019] In some embodiments, when assembling the sign body, the assembly further includes: providing a mounting plate on the inner side of the airbag cover, the shape of the mounting plate matching the shape of the sign body, and providing a fixing hole corresponding to the through hole on the mounting plate; and fixing the lead-out portion to the fixing hole after it is inserted into the through hole.

[0020] In some embodiments, when assembling the sign body, the method further includes: assembling a light source on the mounting plate and gathering the protruding ends of multiple sets of optical fiber bundles together and connecting them to the light source; or assembling a light source on the inner surface of the airbag cover and gathering the protruding ends of multiple sets of optical fiber bundles together and connecting them to the light source; or assembling a light source on the outside of the airbag cover and gathering the protruding ends of the optical fiber bundles together and connecting them to the light source through a main optical fiber.

[0021] The beneficial effects of this invention compared to the prior art include at least the following:

[0022] By arranging multiple fiber bundles into a fiber structure that matches the shape of the sign body, and uniformly encapsulating them inside the sign body, the fiber is embedded in the sign body; the fiber ends extend from the lead-out part of the sign body and are bundled and connected to a detachable light source, so as to achieve uniform light emission of the sign body.

[0023] The design of the light source being detachable from the sign body facilitates the assembly of the illuminated sign. When the illuminated sign is used on vehicle parts including but not limited to airbag covers, the sign body and the light source can be assembled separately, so that the vehicle parts do not need to have large holes matching the outer contour of the illuminated sign, ensuring the strength of the vehicle parts and the assembly stability of the illuminated sign.

[0024] Therefore, the present invention can ensure the assembly stability of the illuminated sign while realizing the illumination of the sign.

[0025] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0027] Figure 1 This diagram shows a side view of the illuminated sign in an embodiment of the present invention.

[0028] Figure 2 This diagram illustrates the structure of the sign body in an embodiment of the present invention.

[0029] Figure 3 A schematic diagram of the optical fiber structure in an embodiment of the present invention is shown;

[0030] Figure 4 A cross-sectional view of the illuminated signboard in an embodiment of the present invention is shown;

[0031] Figure 5 This diagram shows a structural schematic of an airbag cover with an luminous sign installed in an embodiment of the present invention.

[0032] Figure 6 This diagram shows a cross-sectional view of an airbag cover with an luminous sign installed in an embodiment of the present invention.

[0033] Figure 7 This diagram illustrates the assembly structure of the luminous sign and the mounting plate in an embodiment of the present invention.

[0034] Figure 8 This diagram illustrates the optical fiber light guiding principle when the light source is located outside the airbag cover in an embodiment of the present invention.

[0035] Figure 9 The diagram illustrates the steps of a method for manufacturing a luminous sign according to an embodiment of the present invention. Detailed Implementation

[0036] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to fully and completely convey the concept of the exemplary embodiments to those skilled in the art.

[0037] Furthermore, the accompanying drawings are merely illustrative of the invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0038] The step numbers in the method embodiments are only used to indicate different execution contents and do not strictly limit the execution order between steps. It should be noted that, unless there is a conflict, the embodiments of the present invention and the features in different embodiments can be combined with each other.

[0039] Figure 1 The side view of the illuminated sign in the embodiment is shown. Figure 2 This shows the structure of the sign body. Figure 3 The structure of the optical fiber is shown. Figure 4 The cross-sectional structure of the illuminated sign is shown, combined with... Figures 1 to 4 As shown, the luminous sign in this embodiment includes: a sign body 1, which has multiple lead-out portions 11; multiple sets of optical fiber bundles 2, which are arranged into an optical fiber structure 20 that matches the shape of the sign body 1, the optical fiber structure 20 being uniformly encapsulated inside the sign body 1, and the end of each set of optical fiber bundles 2 extending out from a lead-out portion 11; and a light source 3, which is detachable from the sign body 1, and the ends of the multiple sets of optical fiber bundles 2 are converged and connected to the light source 3.

[0040] The luminous sign in the above embodiment achieves fiber embedding by arranging multiple fiber bundles 2 into a fiber structure 20 that matches the shape of the sign body 1, so that the fiber structure 20 is uniformly encapsulated inside the sign body 1; the ends of the fiber bundles 2 extend from the lead-out portion 11 of the sign body 1 and are connected to a detachable light source 3, thus achieving uniform light emission from the sign body 1; furthermore, the detachable design of the light source 3 relative to the sign body 1 facilitates the assembly of the luminous sign; when the luminous sign is applied to vehicle components including but not limited to airbag covers, the sign body 1 and the light source 3 can be assembled separately, so that the vehicle component does not need to have a large hole matching the outer contour of the luminous sign, ensuring the strength of the vehicle component and the assembly stability of the luminous sign; thus, through the structural design of the luminous sign in the above embodiment, the assembly stability of the luminous sign can be ensured while achieving luminescence.

[0041] The sign body 1 in the above embodiment can be designed into different shapes according to the needs of the vehicle model. For example, the sign body 1 can be designed as a ring, an ellipse, a square, etc. Especially for the sign body 1 composed of fine lines, the design of embedding the optical fiber bundle 2 and detachably connecting it with the light source 3 can well balance the light-emitting function and the assembly stability.

[0042] In a specific example, the specific structure of the sign body 1 is referenced. Figure 2 As shown, it has a circular outer contour. Different pattern shapes can be designed within the center of the circular outer contour as needed, for example... Figure 2 The outer contour of the ring is shown with the letters "ZF" in the center. In other examples, it can be other shapes, letters, numbers, Chinese characters, etc. At the bottom of the outer contour of the ring, there are multiple leads 11 for the fiber optic bundle 2 to extend and for assembling the luminous sign to the vehicle components. In this example, the leads 11 are specifically fixed posts located at the bottom of the sign body 1; in other examples, the leads 11 can be designed with other structures, as long as they enable the fiber optic bundle 2 to extend and for the luminous sign to be assembled.

[0043] The sign body 1 is formed by injection molding of a plastic material containing scattering particles to achieve a uniform light effect. Scattering particles include, but are not limited to, alumina particles. The outer surface of the sign body 1 can also be surface-treated using methods such as physical vapor deposition (PVD) to create a metallic texture; if color is required, pigments or paints can be printed onto the outer surface of the sign body 1 using methods such as screen printing, ensuring the coating / plating thickness maintains light transmittance. Furthermore, the bottom of the sign body 1 can be polished and coated with a reflective layer to reflect light that would otherwise be directed towards the bottom of the sign upwards, enhancing light utilization.

[0044] Corresponding to the structure of the sign body 1, the fiber optic structure 20 is referenced. Figure 3 As shown, multiple fiber bundles 2 are formed according to the sign structure layout. Each fiber bundle 2 can be formed by winding ultra-fine side-emitting fibers. Depending on the structure of the sign body 1, fiber bundles 2 of different thicknesses can be formed by winding different numbers of ultra-fine side-emitting fibers to form a fiber structure 20 that perfectly matches the shape of the sign body 1.

[0045] Combination Figures 1 to 4 As shown, the sign body 1, corresponding to the letter "ZF" in the center of the annular outer contour, can be formed into annular rings of equal thickness by multiple sets of optical fiber bundles 2, embedded inside the annular outer contour of the sign body 1. The two ends of each set of optical fiber bundles 2 extend from the root of an outlet 11. Furthermore, corresponding to the letter "Z", three sets of optical fiber bundles 2 can be provided. The first set of optical fiber bundles 2 enters from the bottom of one end of the upper horizontal stroke of the letter "Z" and extends from the bottom of the other end; the second set of optical fiber bundles 2 enters from the bottom of the upper end of the diagonal stroke of the letter "Z" and extends from the bottom of the lower end; the third set of optical fiber bundles 2 enters from the bottom of one end of the lower horizontal stroke of the letter "Z" and extends from the bottom of the other end. The two ends of all the extending optical fiber bundles 2 can be connected to the same light source 3, enabling the entire sign with embedded optical fibers to be illuminated by a single light source 3. The light source 3 includes, but is not limited to, LED beads and other light-emitting devices.

[0046] The specific method of embedding optical fiber into the sign body is as follows: after forming the optical fiber structure 20, the optical fiber structure 20 is fixed in the injection mold, and then in-mold injection molding is performed in the injection mold. For example, injection molding is performed using injection molding material mixed with scattering particles to achieve uniform encapsulation of optical fiber inside the sign body.

[0047] The luminous sign of the present invention can be applied to any vehicle component. The following description uses the application of the luminous sign to the airbag cover as an example, but the present invention is not limited thereto.

[0048] Figure 5 The embodiment shows the structure of the airbag cover with an luminous sign installed. Figure 6 This shows a cross-sectional view of the airbag cover with an illuminated sign installed, combined with... Figure 5 and Figure 6 As shown, when the luminous sign 10 is applied to the airbag cover 4, a through hole (not specifically shown in the figure) is provided on the airbag cover 4 for mounting the lead-out part 11. The sign body 1 is mounted on the outer surface of the airbag cover 4, and the lead-out part 11 is inserted into the through hole. By mounting the sign body 1 to the airbag cover 4 from above, only the through hole for mounting the lead-out part 11 needs to be provided on the airbag cover 4, without the need to open a large hole matching the outer contour of the sign body 1, thus having minimal impact on the surface strength of the airbag cover 4.

[0049] Furthermore, the sign body 1 is assembled onto the airbag cover 4 by cooperating with the mounting plate. Figure 7 The assembly structure of the luminous sign and mounting plate in the embodiment is shown, combined with Figure 6 and Figure 7 As shown, an installation plate 5 is provided on the inner side of the airbag cover 4. The shape of the installation plate 5 is preferably matched with the shape of the nameplate body 1. The installation plate 5 is provided with a fixing hole corresponding to the through hole (not specifically marked in the figure). After the lead-out part 11 is inserted into the through hole, it is fixed in the fixing hole, thereby achieving a stable assembly on the airbag cover 4.

[0050] After the sign body 1 is installed on the airbag cover 4, the fiber optic ends are bundled together and connected to the light source 3. In this embodiment, the light source 3 can be mounted on the mounting plate 5, and the protruding ends of multiple fiber optic bundles 2 are bundled together to the fiber optic bundle end 200 and connected to the light source 3.

[0051] When the illuminated sign 10 needs to be lit, the light source 3 emits light, and the fiber bundle end 200 fixed in front of the light source 3 receives the light. Due to the characteristics of the fiber, the light fills the fiber. Since the fiber is a side-emitting type, the light leaks out from the side wall of each fiber bundle 2. After being homogenized by the sign body 1, the sign can be seen to emit light uniformly on the outside of the illuminated sign 10.

[0052] The location of the light source 3 is not limited to the mounting plate 5. For example, in one embodiment, the light source 3 can be mounted on the inner surface of the airbag cover 4, with the protruding ends of multiple fiber bundles 2 converged together and connected to the light source 3. Alternatively, in another embodiment, the light source 3 can be mounted on the outside of the airbag cover 4, with the protruding ends of multiple fiber bundles 2 converged together and connected to the light source 3 via a main optical fiber.

[0053] Figure 8 The embodiment shown illustrates the principle of fiber optic light guiding when the light source is positioned outside the airbag cover. (Refer to...) Figure 8 As described above, when the light source is installed outside the airbag cover, light can be transmitted through a main optical fiber 6 to the ends of each fiber bundle 2, and then the sign will emit light through each fiber bundle 2. The ends of the main optical fiber 6 and the fiber bundle 2 can be connected through connectors 60.

[0054] Through the above description of the embodiments, when the luminous sign of the present invention is applied to the airbag cover, the sign body, which is a relatively light but large part, can be assembled from the front of the airbag cover without affecting the airbag's detonation characteristics; while the light source is installed on the back of the airbag cover or can be moved out of the airbag, which is feasible.

[0055] This invention also provides a method for manufacturing luminous signs, applicable to the luminous signs described in the above embodiments. Figure 9 The main steps of the method for manufacturing luminous signs in the embodiment are shown below, with reference to... Figure 9 As shown, the method for manufacturing the luminous sign in this embodiment includes: in step S910, according to the shape of the sign, optical fibers are coiled into multiple fiber bundles, and the multiple fiber bundles are arranged into an optical fiber structure matching the shape of the sign; in step S920, the optical fiber structure is fixed in an injection mold; in step S930, a sign body with an internally uniformly encapsulated optical fiber structure is formed by injection molding in the injection mold, and the sign body forms multiple lead-out portions, with the end of each fiber bundle extending from one lead-out portion. Thus, a sign body with internally embedded optical fibers is formed.

[0056] Furthermore, after forming the sign body, the process also includes: forming an airbag cover with a through hole for mounting the lead-out part; mounting the sign body from the outer surface of the airbag cover, so that the luminous sign is fixed to the outer surface of the airbag cover and the lead-out part is inserted into the through hole. Thus, the sign body is mounted on the airbag cover. By mounting the sign body from the outer surface of the airbag cover, only the through hole for mounting the lead-out part needs to be formed on the airbag cover, without needing to create a large hole matching the outer contour of the sign body, ensuring the surface strength of the airbag cover.

[0057] Of course, illuminated signs can also be used on other vehicle parts. The sign body can be assembled onto the corresponding vehicle parts in a way that does not affect the surface strength of the vehicle parts.

[0058] The sign body can be assembled to the airbag cover via a mounting plate. The mounting plate is located on the inside of the airbag cover, and its shape preferably matches the shape of the sign body. The mounting plate is provided with fixing holes corresponding to the through holes. The sign body is assembled from the outer surface of the airbag cover, and after the lead-out part is inserted into the through hole, the lead-out part is further fixed in the fixing hole to achieve a stable assembly between the sign body and the airbag cover.

[0059] Furthermore, the assembly process of the sign body also includes: assembling a light source on the mounting plate and gathering the protruding ends of multiple fiber optic bundles together and connecting them to the light source; or, assembling a light source on the inner surface of the airbag cover and gathering the protruding ends of multiple fiber optic bundles together and connecting them to the light source; or, assembling a light source on the outside of the airbag cover and gathering the protruding ends of the fiber optic bundles together and connecting them to the light source via a main optical fiber. That is, the light source can be placed at any suitable location as needed. When assembling the sign body, simply gathering the fiber optic ends and connecting them to the light source forms a luminous sign.

[0060] The method for manufacturing the luminous sign in the above embodiment involves assembling the sign body from the front of the airbag cover to ensure the surface strength of the airbag cover and to have no impact on the airbag's detonation characteristics. The light source does not need to be tied to the sign body; it can be installed on the back of the airbag cover or moved out of the airbag. It is feasible to simply connect the fiber optic end to the light source.

[0061] In summary, the luminous sign and its manufacturing method provided by this invention achieves fiber embedding by arranging multiple fiber bundles into a fiber structure that matches the shape of the sign body, uniformly encapsulating the fiber structure within the sign body. The ends of the fiber bundles extend from the lead-out portion of the sign body and are then connected to a detachable light source, achieving uniform light emission from the sign body. Furthermore, the detachable design of the light source relative to the sign body facilitates the assembly of the luminous sign. When the luminous sign is applied to vehicle components, including but not limited to airbag covers, the sign body and the light source can be assembled separately, eliminating the need for large holes matching the outer contour of the luminous sign in the vehicle component, thus ensuring the strength of the vehicle component and the assembly stability of the luminous sign. Therefore, the structural design of the luminous sign of this invention effectively achieves sign illumination while ensuring the assembly stability of the luminous sign.

[0062] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A luminous sign, characterized in that, Applications include: Airbag covers The sign body is provided with multiple lead-out sections; The airbag cover has a through hole for assembling the lead-out part. The nameplate body is assembled on the outer surface of the airbag cover, and the lead-out part is inserted into the through hole. The inner side of the airbag cover has a mounting plate with a fixing hole corresponding to the through hole. After the lead-out part is inserted into the through hole, it is fixed to the fixing hole. Multiple fiber bundles are arranged in a fiber structure that matches the shape of the sign body. The fiber structure is uniformly encapsulated within the sign body, and the end of each fiber bundle extends from one of the lead-out portions. The light source is detachable from the sign body, and the protruding ends of the multiple sets of optical fiber bundles are converged and connected to the light source. The light source is mounted on the outside of the airbag cover, and the protruding ends of multiple sets of optical fiber bundles are bundled together and connected to the light source through a main optical fiber.

2. The luminous sign as described in claim 1, characterized in that, The light source is mounted on the mounting plate, and the protruding ends of the multiple sets of optical fiber bundles are converged together and connected to the light source; or The light source is mounted on the inner surface of the airbag cover, and the protruding ends of the multiple sets of optical fiber bundles are bundled together and connected to the light source.

3. The luminous sign as described in claim 1, characterized in that, The fiber bundle is a side-emitting fiber bundle.

4. The luminous sign as described in claim 1, characterized in that, The lead-out part is a fixed column foot located at the bottom of the sign body.

5. The luminous sign as described in claim 1, characterized in that, The sign body is formed by injection molding of a plastic material containing scattering particles; The scattering particles include alumina particles.

6. The luminous sign as described in claim 5, characterized in that, The outer surface of the sign body is coated with a light-transmitting surface coating by physical vapor deposition and / or screen printing; and / or The bottom of the sign body is polished and coated with a reflective coating.

7. A method for manufacturing a luminous sign, characterized in that, The method for manufacturing a luminous sign as described in any one of claims 1 to 6 includes: According to the shape of the sign, the optical fiber is twisted into multiple groups of optical fiber bundles, and the multiple groups of optical fiber bundles are arranged into an optical fiber structure that matches the shape of the sign. The optical fiber structure is fixed inside an injection mold; A nameplate body with the optical fiber structure uniformly coated inside is formed by injection molding in the injection mold. The nameplate body forms multiple lead-out parts, and the end of each group of optical fiber bundles extends out from one of the lead-out parts. A safety airbag cover with a through hole for mounting the lead-out portion is formed, and the sign body is mounted from the outer surface of the safety airbag cover, so that the sign body is fixed to the outer surface of the safety airbag cover and the lead-out portion is inserted into the through hole. The assembly of the sign body further includes: providing a mounting plate on the inner side of the airbag cover, the mounting plate having a fixing hole corresponding to the through hole; inserting the lead-out part into the through hole and fixing it to the fixing hole; and assembling a light source on the outside of the airbag cover, and gathering the protruding ends of the optical fiber bundle together and connecting them to the light source through a main optical fiber.

8. The manufacturing method as described in claim 7, characterized in that, When assembling the sign body, it also includes: A light source is mounted on the mounting plate, and the protruding ends of the multiple sets of optical fiber bundles are bundled together and connected to the light source; or A light source is mounted on the inner surface of the airbag cover, and the protruding ends of multiple sets of optical fiber bundles are gathered together and connected to the light source.

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