Light guide module and vehicle tail lamp

Abstract

The utility model discloses a light guide module and a taillight, the taillight comprises a lamp housing and the light guide module, the light guide module comprises a back plate, a PCB (printed circuit board), LED lamp beads and a light guide plate, the back plate is provided with a groove, the PCB is arranged on one side wall of the groove, the light guide plate is arranged on the other side wall of the groove, the LED lamp beads are arranged on the other side wall of the groove, and the LED lamp beads are arranged on the other side wall of the groove. The LED lamp beads are connected to the PCB and correspond to the side portion of the light guide plate, a diffusion sheet and an optical filter are arranged at the top of the light guide plate, a reflection sheet is arranged at the bottom of the light guide plate, and the lamp shell is arranged at the top of the back plate. According to the automobile tail lamp, the overall thickness of the automobile tail lamp can be effectively reduced, the number of the LED lamp beads can be reduced, and cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle lamps, in particular to a light guide module and a vehicle taillight. Background Art

[0002] The tail signal lights used in vehicles are mainly composed of a lamp housing and a light source. They serve as signal indicators for width, braking, stopping, etc., so as to provide corresponding indication information to the vehicles behind during the vehicle's driving process. They can also serve as a warning at night to prevent the rear vehicles from rear-end collisions due to speeding without noticing the vehicles in front.

[0003] The existing light sources of taillights are generally divided into halogen bulbs and LED lamp beads. Among them, LED lamp beads have the characteristics of low energy consumption, small size, and long service life. They have been widely used as the light source of car taillights. Figure 1 Traditional taillights use a direct-down LED layout structure, which is mainly composed of a back panel 100, a PCB board 110, LED lamp beads 120 and a lampshade 180. In order to make the light effect of the luminous surface more uniform, more LED lamp beads 120 or a larger light mixing distance need to be arranged. At the same time, a light expansion structure needs to be processed on the lampshade 180, which leads to high cost and large volume. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the present invention provides a light guide module and a taillight, which can effectively reduce the overall thickness of the taillight and reduce the number of LED lamp beads, thereby reducing costs.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A light guide module includes a back plate, a PCB board, LED lamp beads and a light guide plate, wherein the back plate is provided with a groove, the PCB board is arranged on one side wall of the groove, the light guide plate is arranged on the other side wall of the groove, the LED lamp beads are connected to the PCB board, and the LED lamp beads correspond to the side of the light guide plate.

[0007] As a further improvement of the above technical solution, the PCB board is in the shape of a long strip, the length direction of the PCB board is horizontal, the PCB board corresponds to the side of the light guide plate, the number of the LED lamp beads is multiple, and the multiple LED lamp beads are arranged in sequence along the length direction of the PCB board.

[0008] As a further improvement of the above technical solution, the distances between two adjacent LED lamp beads are the same.

[0009] As a further improvement of the above technical solution, a diffusion sheet is provided on the top of the light guide plate.

[0010] As a further improvement of the above technical solution, a filter is provided on the top of the diffuser.

[0011] As a further improvement of the above technical solution, a reflective sheet is provided at the bottom of the light guide plate.

[0012] A vehicle taillight comprises a lamp housing and the above-mentioned light guide module.

[0013] As a further improvement of the above technical solution, the lamp housing is installed on the top of the back plate, and the lamp housing and the back plate are enclosed to form a closed inner cavity.

[0014] As a further improvement of the above technical solution, the lamp housing and the back plate are connected via a bracket, and the bracket is L-shaped.

[0015] The beneficial effects of the present invention are as follows: the present invention provides a light guide module and a taillight, which are provided by setting a PCB board, LED lamp beads and a light guide plate, a diffuser and a filter are provided on the top of the light guide plate, a reflector is provided on the bottom of the light guide plate, the LED lamp beads correspond to the side of the light guide plate, the light emitted by the LED lamp beads enters the interior of the light guide plate from the side of the light guide plate, the light is refracted and conducted inside the light guide plate, part of the light is emitted from the top surface of the light guide plate, and part of the light is emitted from the bottom surface of the light guide plate. The light emitted from the bottom surface of the light guide plate is reflected by the reflector and emitted from the top surface of the light guide plate, so that the point light source is converted into a surface light source, and the light emitted from the top surface of the light guide plate passes through the diffuser and the filter in turn and then irradiates the lamp housing, so that the taillight emits uniform light, thereby effectively reducing the overall thickness of the taillight, and reducing the number of LED lamp beads and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a schematic diagram of the cross-sectional structure of the taillight before improvement;

[0018] Figure 2 This is a schematic cross-sectional view of an embodiment of the present invention;

[0019] Figure 3 It is a partial structural diagram of the utility model.

[0020] Reference numerals: 100 - back panel, 110 - PCB board, 120 - LED lamp beads, 130 - light guide plate, 140 - groove, 150 - diffuser, 160 - filter, 170 - reflector, 180 - lamp housing, 190 - bracket. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technical personnel in this field without creative work are within the scope of protection of the present invention. In addition, all the connection / connection relationships involved in the patent do not refer to the direct connection of components, but refer to the fact that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the creation of the present invention can be combined interactively without conflicting with each other.

[0022] Reference Figure 2 and Figure 3 An example of the present invention provides a vehicle taillight, including a lamp housing 180 and a light guide module.

[0023] Among them, the light guide module includes a back panel 100, a PCB board 110, LED lamp beads 120 and a light guide plate 130. The back panel 100 is provided with a groove 140, the PCB board 110 is arranged on one side wall of the groove 140, and the light guide plate 130 is arranged on the other side wall of the groove 140. The LED lamp beads 120 are connected to the PCB board 110, and the LED lamp beads 120 correspond to the side of the light guide plate 130. The light guide plate 130 is flat and horizontally arranged. The lamp housing 180 is arranged on the top of the back panel 100.

[0024] It can be understood that the light emitted by the LED lamp bead 120 enters the interior of the light guide plate 130 from the side of the light guide plate 130, and the light is refracted and conducted inside the light guide plate 130, so that the light is evenly emitted from the upper and lower surfaces of the light guide plate 130, and then evenly irradiated onto the lamp housing 180 by the light guide plate 130, so that the point light source is converted into a surface light source, thereby effectively reducing the overall thickness of the taillight, and the number of LED lamp beads 120 can be reduced, thereby reducing costs.

[0025] It should be noted that the light guide plate 130 can be an optical-grade acrylic sheet or PC sheet. The extremely high refractive index and non-light absorption characteristics of the acrylic sheet or PC sheet are utilized, and light guide points are printed on the bottom surface of the acrylic sheet or PC sheet using laser engraving, V-shaped cross grid engraving, and UV screen printing technology. The light emitted by the LED lamp beads 120 stays on the surface of the optical-grade acrylic sheet or PC sheet. When the light hits each light guide point, the reflected light will diffuse to various angles, and then destroy the reflection conditions and be emitted from the front of the light guide plate 130. Through various light guide points of different densities and sizes, the light guide plate 130 can emit light evenly.

[0026] In some preferred embodiments, the PCB board 110 is in the shape of an elongated strip, the length direction of the PCB board 110 is horizontal, the PCB board 110 corresponds to the side of the light guide plate 130, the number of LED lamp beads 120 is multiple, and the multiple LED lamp beads 120 are arranged in sequence along the length direction of the PCB board 110. The multiple LED lamp beads 120 can increase the brightness and improve the warning effect of the taillights.

[0027] Furthermore, the distances between two adjacent LED lamp beads 120 are the same, so that the light points are evenly distributed on the side of the light guide plate 130, and the light from multiple LED lamp beads 120 can enter evenly from the side of the light guide plate 130, so that the light from the light guide plate 130 can be more evenly irradiated onto the lamp housing 180, thereby improving the display effect of the taillights.

[0028] In some preferred embodiments, a diffuser 150 is provided on the top of the light guide plate 130. The light emitted from the top of the light guide plate 130 passes through the diffuser 150 and then irradiates the lamp housing 180. The diffuser 150 can irradiate the light in a divergent manner to prevent the light from gathering in a limited area, thereby further improving the uniformity of the light.

[0029] In some preferred embodiments, a filter 160 is provided on the top of the diffuser 150. The filter 160 can filter out unnecessary spectral components or interfering light in the incident light, so that the light is converted into a set color and emitted. Specifically, the taillights of a car are generally red, and there is also yellow for turning. No specific color is limited in this embodiment.

[0030] In some preferred embodiments, a reflective sheet 170 is provided at the bottom of the light guide plate 130. After the light from the LED lamp bead 120 enters the light guide plate 130, part of the light is emitted from the top surface of the light guide plate 130, and part of the light is emitted from the bottom surface of the light guide plate 130. The light emitted from the bottom surface of the light guide plate 130 is reflected by the reflective sheet 170 and emitted from the top surface of the light guide plate 130, thereby improving the utilization rate of the light and improving the brightness of the taillights.

[0031] In some preferred embodiments, the lamp housing 180 and the back panel 100 are enclosed to form a closed inner cavity, so that the PCB board 110, the LED lamp beads 120 and the light guide plate 130 are all located inside the inner cavity, thereby preventing external rain or dust from entering the taillight and improving the service life of the taillight.

[0032] Furthermore, the lamp housing 180 and the back panel 100 are connected by a bracket 190, and the bracket 190 is L-shaped. On the one hand, the L-shaped bracket 190 can support the lamp housing 180 so that the connection between the lamp housing 180 and the back panel 100 is firm. On the other hand, the L-shaped bracket 190 can position the lamp housing 180 to prevent the lamp housing 180 from shifting, thereby improving the assembly accuracy of the taillights.

[0033] The above is a specific description of the preferred implementation of the present invention, but the invention of the present invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A light guide module, characterized in that: The invention comprises a back plate (100), a PCB board (110), an LED lamp bead (120) and a light guide plate (130); the back plate (100) is provided with a groove (140); the PCB board (110) is arranged on one side wall of the groove (140); the light guide plate (130) is arranged on the other side wall of the groove (140); the LED lamp bead (120) is connected to the PCB board (110); and the LED lamp bead (120) corresponds to the side of the light guide plate (130).

2. The light guide module according to claim 1, wherein: The light guide plate (130) is in the shape of a flat plate and is arranged horizontally.

3. The light guide module according to claim 2, wherein: The PCB board (110) is in an elongated strip shape, the length direction of the PCB board (110) is a horizontal direction, the PCB board (110) corresponds to the side of the light guide plate (130), the number of the LED lamp beads (120) is multiple, and the multiple LED lamp beads (120) are arranged in sequence along the length direction of the PCB board (110).

4. The light guide module according to claim 2, wherein: The distances between two adjacent LED lamp beads (120) are the same.

5. The light guide module according to claim 1, wherein: A diffusion sheet (150) is provided on the top of the light guide plate (130).

6. The light guide module according to claim 5, characterized in that: A filter (160) is provided on the top of the diffusion plate (150).

7. The light guide module according to claim 1, characterized in that: A reflective sheet (170) is provided at the bottom of the light guide plate (130).

8. A taillight, characterized in that: It comprises a lamp housing (180) and the light guide module according to any one of claims 1 to 7.

9. The vehicle taillight according to claim 8, characterized in that: The lamp housing (180) is mounted on the top of the back plate (100), and the lamp housing (180) and the back plate (100) are enclosed to form a closed inner cavity.

10. The vehicle taillight according to claim 9, characterized in that: The lamp housing (180) and the back plate (100) are connected via a bracket (190), and the bracket (190) is L-shaped.

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