Light guide structure for automobile tail lamp and automobile tail lamp

Abstract

The light guide structure comprises a light guide strip and a light source which is arranged at one end of the light guide strip and used for emitting light into the light guide strip, and the light guide strip comprises a position lamplight guide strip and a steering lamp light guide strip. The front ends of the position light guide strip and the steering lamp light guide strip are each provided with an arc-shaped light-emitting face protruding outwards and a plurality of arc-shaped inwards-concave faces which are horizontally arranged on the light-emitting face side by side and used for refracting light towards the outer side of the light guide strip. The rear ends of the position light guide strip and the steering lamp light guide strip are each provided with a far-end reflection part opposite to the arc-shaped inwards-concave face, and the upper side and the lower side of the far-end reflection part of the steering lamp light guide strip are each provided with a reflection diffusion face connected with the arc-shaped inwards-concave face and arranged in an inwards-concave mode.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle lamps, and in particular to a light guide structure for a vehicle tail lamp and the vehicle tail lamp. Background Art

[0002] Car taillights are usually installed at the rear of the car body for nighttime lighting to remind the rear vehicles to keep a safe distance. To ensure the lighting effect of car taillights, existing car taillights generally use LED light sources and light guides to transmit light. However, this lighting method will cause the light guides close to the LED position to have higher brightness, while the light guides far from the LED will produce dark areas, which will affect the lighting effect of the car taillights. Summary of the invention

[0003] The present invention aims to solve the problems existing in the above-mentioned prior art and provides a light guide structure for automobile taillights and an automobile taillight, which ensures that the brightness of different positions of the light guide strip is consistent and ensures the lighting effect of the automobile taillight.

[0004] The present invention solves the technical problem by adopting a technical solution: the light guide structure for automobile taillights comprises a light guide bar and a light source arranged at one end of the light guide bar for emitting light into the light guide bar, the light guide bar comprises a position light guide bar and a turn light guide bar, the front ends of the position light guide bar and the turn light guide bar are both provided with a light emitting surface convexly arranged outwardly in an arc shape and a plurality of arc-shaped inner concave surfaces arranged horizontally and parallelly on the light emitting surface for refracting light to the outside of the light guide bar, the rear ends of the position light guide bar and the turn light guide bar are both provided with a distal end reflection portion arranged opposite to the arc-shaped inner concave surface, the turn light guide bar is provided with a distal end reflection portion arranged opposite to the arc-shaped inner concave surface, and the turn light guide bar is provided with a distal end reflection portion arranged opposite to the arc-shaped inner concave surface. Reflective diffusion surfaces connected to the arc-shaped inner concave surface and arranged inwardly are provided on the upper and lower sides of the distal reflector. The light is first dispersed over a large range by setting the circular arc light-emitting surface, and then the emitted light is converged within a certain range in a small range by the arc-shaped inner concave surface, thereby further improving the uniformity of the light output of the light guide bar. At the same time, the distal reflector is set at the rear end of the light guide bar to further increase the reflected light directed to the arc-shaped inner concave surface, and the concave reflective diffusion surfaces are set at the upper and lower ends of the arc-shaped inner concave surface to further increase the reflected light directed to the arc-shaped inner concave surface, thereby enhancing the brightness of the corresponding position of the light guide bar.

[0005] A car taillight comprises an outer lampshade arranged at the front end of a light guide strip, a mounting shell arranged at the outside of the outer lampshade and a reflective shielding cover arranged at the rear end of the light guide strip. The car taillight also comprises the above-mentioned light guide structure; the outer lampshade comprises an upper position light inner cover arranged horizontally at the upper end, turn signal light inner covers respectively arranged at the left and right sides and lower position light inner covers respectively arranged at the lower ends of the turn signal light inner covers at the left and right sides, the position light guide strip is arranged at the rear ends of the upper position light inner cover and the lower position light inner cover, the turn signal light inner cover comprises an upper frame arranged horizontally at the upper end, a lower frame arranged gradually upwardly tilted from the outside to the inside at the lower end of the upper frame and a connecting inner frame connecting the upper frame and the lower frame.

[0006] Preferably, the turn signal light guide strip includes an upper turn signal light guide strip located at the rear end of the upper frame and a lower turn signal light guide strip located at the rear end of the lower frame, the light source includes turn signal light sources located at the inner ends of the upper turn signal light guide strip and the inner ends of the lower turn signal light guide strip, respectively, and a connecting light guide is provided at the rear end of the connected inner frame, which is arranged on one side close to the turn signal light source and connects the upper turn signal light guide strip and the lower turn signal light guide strip. The upper turn signal light guide strip and the lower turn signal light guide strip are provided to light up the upper and lower frames, and at the same time, in order to facilitate the lighting of the connected inner frame, a connecting light guide is designed to receive the light emitted by the upper and lower turn signal light guide strips, further utilize the light, and then light up the connected inner frame.

[0007] Preferably, the connecting light guide is gradually tilted outward in the direction from the upper turning light guide bar to the downward turning light guide bar, and the angle between the connecting light guide and the upper turning light guide bar is set at 30°-90°. The connecting light guide can inject more light reflected from the upper turning light guide bar, thereby enhancing the luminous intensity of the connecting light guide.

[0008] Preferably, the connecting light guide is gradually narrowed from one end close to the turn light source to the end far away from the turn light source, and the front end of the connecting light guide is provided with an outgoing light surface which is convex in an arc shape, and the outgoing light surface is provided with a plurality of first arc-shaped diffusion surfaces which are spaced from each other and protrude outwardly on the outgoing light surface. The connecting light guide is gradually narrowed to reduce the reflection stroke of the light in the connecting light guide and increase the number of reflections of the light at the lower end of the connecting light guide; at the same time, the light emitted from the connecting light guide can be further dispersed outwardly through the outgoing light surface and the first arc-shaped diffusion surface, thereby further avoiding uneven brightness of the connecting light guide.

[0009] Preferably, the position light guide strip includes an upper position light guide strip continuously arranged from left to right at the rear end of the upper position light inner cover, and the light source also includes an upper position light source located outside the light incident ends on the left and right sides of the upper position light guide strip. A light blocking device is provided at the front end of the upper position light source and is located on the upper position light guide strip for blocking the sidewardly emitted light from the upper position light source.

[0010] Preferably, the turn signal light source and the upper position light light source include LED lamp beads respectively spaced apart from the light guide bar and a circuit board installed on a side of the LED lamp beads away from the light guide bar.

[0011] Preferably, the light blocking device includes a connecting portion extending outward from the upper position light guide bar and a light blocking portion fixedly connected to the connecting portion and surrounding the front end of the upper position light source. The light blocking portion extends from the upper position light guide bar to the circuit board and is contacted with the circuit board. The light blocking portion covers and blocks the space between the upper position light guide bar and the circuit board to prevent the light emitted forward by the LED lamp beads from emitting outward.

[0012] Preferably, the upper position light guide strip includes a main light emitting portion located in the middle part and auxiliary light emitting portions respectively located on the left and right sides of the main light emitting portion and connected to the main light emitting portion, the auxiliary light emitting portions are bent and inclined gradually backward from the connecting end, the circuit boards on the upper position light source on the left and right sides of the upper position light guide strip are inclined gradually inward from front to back, and there is a certain installation gap between the outer lampshade and the rear of the vehicle, the circuit board and the light blocking portion are inclined relative to the installation gap, even if part of the light is emitted from the gap between the circuit board and the light blocking portion, it will be emitted to the inner surface of the rear of the vehicle outside, away from the installation gap, due to the inclined circuit board and the light blocking portion, thereby avoiding the light from being directly emitted from the installation gap.

[0013] Preferably, the position light guide strip also includes a lower position light guide strip located at the rear end of the lower position light inner cover, the lower position light guide strip includes a main display portion arranged in an arc shape and corresponding to the lower position light inner cover, an inwardly curved connecting portion connected to the inner end of the main display portion and gradually inclined backward, and a light entrance portion connected to the inwardly curved connecting portion and arranged relatively parallel to the rear end of the mounting shell.

[0014] The beneficial effects of the present invention are as follows: the present invention optimizes light dispersion and convergence through the dual design of the arc-shaped light-emitting surface and the arc-shaped inner concave surface, combined with the distal reflection part and the reflection diffusion surface, and significantly improves the uniformity and brightness of the light emitted by the light guide strip; the design of the upper and lower turning light guide strips and the connecting light guides makes full use of the light reflection path, reduces the dark area, and realizes the complete lighting of the turn signal area; the cooperation of the light blocking part and the inclined circuit board effectively prevents the lateral light leakage of the LED light source, avoids the light leakage from the installation gap, and improves the visual beauty and functional reliability; the distal reflection part and the reflection diffusion surface increase the light utilization rate and reduce the energy loss of the light source. At the same time, the tapered design of the connecting light guide and the arc diffusion surface further reduce the risk of uneven brightness. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 An exploded view of the present invention; Figure 3 for Figure 2 A magnified view of part A; Figure 4 is a cross-sectional view of the upper position light guide; Figure 5 is a cross-sectional view of an upwardly turned light guide strip; Figure 6 It is a schematic diagram of the structure of the inner cover of the turn signal lamp; Figure 7 It is a schematic diagram of the structure of the turn light guide strip; Figure 8 for Figure 7 A magnified view of part B; Fig. 9A top view of the installation housing and upper position light guide strip; Fig.10 for Fig. 9 Enlarged view of part C; Fig.11 It is a schematic diagram of the structure of the light guide strip at the lower left side; Fig.12 It is a schematic diagram of the structure of the vertical reflection surface and the light adjustment surface outside the upper position light guide strip; Fig.13 This is a schematic diagram of the structure of the vertical reflection surface and the light adjustment surface at the middle end of the upper position light guide strip; Fig.14 It is a schematic diagram of the reflection path of part of the light in the upper position light guide; Fig.15 A schematic diagram of the reflection path of part of the light in the upward turning light guide strip; Fig.16 It is a schematic diagram of the reflection path of part of the light when the light adjustment part at the middle end of the upper position light guide strip is convex; Fig.17 It is a schematic diagram of the reflection path of part of the light when the light adjustment part on the left side of the upper position light guide strip is convex; Fig.18 It is a schematic diagram of the reflection path of part of the light when the light adjustment part on the lower position light guide strip is set concavely; Fig.19 This is a schematic diagram of the partial light reflection path when the light adjustment part on the left lower position light guide away from the light source is working.

[0016] Description of reference numerals: Light guide bar 1, outer lamp cover 2, mounting shell 3, reflective shielding cover 4, light emitting surface 5, arc-shaped inner concave surface 6, distal reflective portion 7, reflective diffusion surface 8, turn signal light source 9, outer light emitting surface 10, first arc-shaped diffusion surface 11, upper position light light source 12, light blocking device 13, LED lamp beads 14, circuit board 15, main light emitting portion 16, auxiliary light emitting portion 17, main display portion 18, inner curved connecting portion 19, light input portion 20, lower position light light source 22, upper position light inner cover 2-1, turn signal light inner cover 2- 2. lower position light inner cover 2-3, position light guide strip 1-1, turn light guide strip 1-2, vertical reflective surface 7-1, upper frame 2-2-1, lower frame 2-2-2, connecting inner frame 2-2-3, upper turn light guide strip 1-2-1, lower turn light guide strip 1-2-2, connecting light guide 1-2-3, upper position light guide strip 1-1-1, lower position light guide strip 1-1-2, light adjustment part 7-2, light adjustment surface 7-2-1, connecting part 13-1, light blocking part 13-2. DETAILED DESCRIPTION

[0017] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0018] See attached Figure 1 and Figure 2 : The present embodiment discloses a light guide structure for a car taillight and a corresponding car taillight using the light guide structure; it includes a light guide bar 1, a light source arranged at one end of the light guide bar 1 for transmitting light into the light guide bar 1, an outer lamp cover 2 arranged at the front end of the light guide bar 1, a mounting shell 3 arranged at the outside of the outer lamp cover 2, and a reflective shielding cover 4 arranged at the rear end of the light guide bar 1; in the present embodiment, the outer lamp cover 2 and the mounting shell 3 are integrally formed by two-color injection molding; in the present embodiment, the light guide bar 1 is arranged between the reflective shielding cover 4 and the outer lamp cover 2, and when in use, the light source emits light to the light guide bar 1, and the light is reflected and transmitted in the light guide bar 1 so that the light guide bar 1 emits light, and then the light is emitted from the outer lamp cover 2 through the light guide bar 1 to form a corresponding light prompt.

[0019] like Figure 2 As shown, in order to meet the requirements of multiple functions of the automobile taillight during use, the outer lamp cover 2 in this embodiment includes an upper position lamp inner cover 2-1 arranged in a horizontal streamlined shape at the upper end, a turn signal lamp inner cover 2-2 respectively arranged on the left and right sides of the mounting shell 3, and a lower position lamp inner cover 2-3 respectively arranged at the lower ends of the turn signal lamp inner cover 2-2 on the left and right sides; correspondingly, the light guide bar 1 in this embodiment also includes a position lamp guide bar 1-1 respectively located at the rear ends of the upper position lamp inner cover 2-1 and the rear ends of the lower position lamp inner cover 2-3, and a turn signal lamp guide bar 1-2 located at the rear end of the turn signal lamp inner cover 2-2.

[0020] like Figure 3 As shown, in order to further diffuse the light emitted from the light guide strip 1 to the outer lampshade 2 and ensure that the emitted light is relatively uniform, in this embodiment, the front ends of the position light guide strip 1-1 and the turn light guide strip 1-2 close to the outer lampshade 2 are both provided with a light emitting surface 5 convex outwardly in an arc shape; correspondingly, on the basis of relatively uniform emitted light, in order to increase the brightness of the outer lampshade 2, in this embodiment, a plurality of arc-shaped inner concave surfaces 6 are arranged horizontally and vertically in parallel for refracting light to the outer lampshade 2. Specifically, as shown in FIG. Figure 3 , Figure 4 and Figure 5As shown, the arc-shaped inner concave surface 6 in this embodiment is gradually arc-shaped and concave from the upper and lower sides to the center, so that the light is refracted and diffused outward through the arc-shaped outer convex light surface 5 in a large range, and the light is refracted and contracted inward through the arc-shaped inner concave surface 6 in a small range, so that the light irradiated on the outer lampshade 2 is relatively uniform and the brightness of the outer lampshade 2 is relatively high; on this basis, in order to further increase the amount of light emitted to the outer lampshade 2, in this embodiment, the rear ends of the position light guide strip 1-1 and the turn light guide strip 1-2 are provided with a distal reflector 7 arranged opposite to the arc-shaped inner concave surface 6; specifically, the distal reflector 7 includes vertical reflective surfaces 7-1 respectively arranged at the rear ends of the position light guide strip 1-1 and the turn light guide strip 1-2; as shown Fig.14 As shown, when the vertical reflection surface 7-1 is not provided, the light in the G1 direction is emitted to the inner wall of the rear end of the optical waveguide strip 1 and then is reflected along the G3 direction. When the vertical reflection surface 7-1 is provided, the light in the G1 direction is reflected by the vertical reflection surface 7-1 and then is emitted to the arc-shaped inner concave surface 6 along the G2 direction, thereby relatively increasing the light emitted to the arc-shaped inner concave surface 6, thereby enhancing the light intensity emitted from the arc-shaped inner concave surface 6, and thereby relatively enhancing the luminous brightness of the outer lampshade 2.

[0021] Furthermore, in order to further enhance the luminous brightness of the light guide bar 1, in this embodiment, both upper and lower sides of the distal reflective portion 7 are provided with reflective diffusion surfaces 8 connected to the arc-shaped inner concave surface 6 and arranged inwardly; specifically, as Figure 5 As shown, in this embodiment, a reflective diffusion surface 8 is provided on the distal reflective portion 7 of the turn signal light guide strip 1-2, wherein the reflective diffusion surface 8 is provided along the turn signal light guide strip 1-2 and connects the vertical reflective surface 7-1 and the arc-shaped inner concave surface 6, as shown in FIG. Figure 5 As shown, on the cross section of the turn signal light guide strip 1-2, both sides of the reflective diffusion surface 8 are gradually bent toward the center of the turn signal light guide strip 1-2; when in use, as shown in FIG. Fig.15 As shown, when the reflective diffusion surface 8 is not provided, the light in the direction of L1 is directed toward the inner wall of the rear end of the turn signal light guide 1-2 and then reflected along the direction of L3. When the reflective diffusion surface 8 is provided, the light in the direction of L1 is reflected by the reflective diffusion surface 8 and then directed toward the arc-shaped inner concave surface 6 along the direction of L2, thereby relatively increasing the light directed toward the arc-shaped inner concave surface 6. At the same time, since the reflective diffusion surface 8 is an arc-shaped inner concave surface bent toward the center of the turn signal light guide 1-2, the light directed toward the reflective diffusion surface 8 is reflected by the reflective diffusion surface 8 and then diffused outward, thereby making the light in the turn signal light guide 1-2 relatively dispersed, and thereby making the light directed toward the arc-shaped inner concave surface 6 relatively dispersed, thereby avoiding the relative concentration of the emitted light from the arc-shaped inner concave surface 6 and avoiding the uneven lighting of the outer lampshade 2.

[0022] Specifically, Figure 6As shown, the turn signal lamp inner cover 2-2 in this embodiment includes an upper frame 2-2-1 horizontally arranged at the upper end, a lower frame 2-2-2 gradually inclined upward from the outside to the inside at the lower end of the upper frame 2-2-1, and a connecting inner frame 2-2-3 connecting the upper frame 2-2-1 and the lower frame 2-2-2; correspondingly, in order to respectively make the corresponding parts realize light emission, as shown in FIG. Figure 7 As shown, in this embodiment, the turn signal light guide strip 1-2 includes an upper turn signal light guide strip 1-2-1 located at the rear end of the upper frame 2-2-1 and a lower turn signal light guide strip 1-2-2 located at the rear end of the lower frame 2-2-2.

[0023] In order to achieve uniform light emission of the upper and lower steering light guides and avoid light leakage from the light source, the light source in this embodiment includes a steering light source 9 located at the inner end of the upper steering light guide 1-2-1 and the inner end of the lower steering light guide 1-2-2, so that the light sources on the upper steering light guide 1-2-1 and the lower steering light guide 1-2-2 are arranged on the side facing the middle end of the automobile taillight, thereby making the light source away from the connection around the automobile taillight to avoid light leakage from the light source through the gap at the connection; Figure 6 and Figure 7 As shown, in this embodiment, in order to ensure the luminous brightness at the connection inner frame 2-2-3, the turn signal light guide strip 1-2 also includes a connecting light guide 1-2-3 arranged on one side close to the turn signal light source 9 and connecting the upper turn signal light guide strip 1-2-1 and the lower turn signal light guide strip 1-2-2, wherein the connecting light guide 1-2-3, the upper turn signal light guide strip 1-2-1 and the lower turn signal light guide strip 1-2-2 are arranged in an integrated structure, so that the connecting inner frame 2-2-3 is arranged at the front end of the connecting light guide 1-2-3, and then during use, part of the light transmitted in the upper turn signal light guide strip 1-2-1 and the lower turn signal light guide strip 1-2-2 can enter the connecting light guide 1-2-3, and the connecting light guide 1-2- 3 is arranged on the side close to the turn signal light source 9, so that the connecting light guide 1-2-3 is arranged on the side with more light. At the same time, the upper end of the connecting light guide 1-2-3 in this embodiment is connected to the lower end of the side of the upper turning light guide bar 1-2-1, and the lower end of the connecting light guide 1-2-3 is connected to the upper end of the side of the lower turning light guide bar 1-2-2, so that the excess light on the upper turning light guide bar 1-2-1 and the lower turning light guide bar 1-2-2 can be better utilized, and then the excess light emitted laterally from the upper turning light guide bar 1-2-1 and the lower turning light guide bar 1-2-2 is received by the connecting light guide 1-2-3, and the light is emitted outwardly through the refraction of the excess light by the connecting light guide 1-2-3, so that the connecting inner frame 2-2-3 emits light.

[0024] Furthermore, in order to ensure that the inner frame 2-2-3 emits light with a certain brightness, the connecting light guide 1-2-3 is gradually tilted outward in the direction from the upper turning light guide bar 1-2-1 to the lower turning light guide bar 1-2-2, and the angle between the connecting light guide 1-2-3 and the upper turning light guide bar 1-2-1 is set at 30°-90°; Figure 7 As shown, Figure 7 The turn signal light guide strip 1-2 on the left side of the taillight, the turn signal light source 9 is arranged on the right side of the upper turn signal light guide strip 1-2-1 and the lower turn signal light guide strip 1-2-2, and the connecting light guide 1-2-3 corresponding to the turn signal light guide strip 1-2 is gradually inclined from top to bottom toward the left end outside, so that the connection surface between the connecting light guide 1-2-3 and the upper turn signal light guide strip 1-2-1 is larger, and then when the light is lit, the connecting light guide 1-2-3 can inject more light reflected from the upper turn signal light guide strip 1-2-1, and similarly, the connection surface between the connecting light guide 1-2-3 and the lower turn signal light guide strip 1-2-2 is increased, thereby enhancing the luminous intensity of the connecting light guide 1-2-3; further, as Figure 8 As shown, at the same time, since more light is incident on the upper end of the connecting light guide 1-2-3, in order to avoid uneven brightness of the connecting inner frame 2-2-3, the connecting light guide 1-2-3 is gradually reduced from one end close to the turn light source 9 to the end away from the turn light source 9. In this embodiment, since the connecting light guide 1-2-3 is gradually tilted toward the left end from top to bottom, the upper end of the connecting light guide 1-2-3 is arranged close to the turn light source 9, and then the corresponding connecting light guide 1-2-3 is gradually reduced from top to bottom. The gradually reduced connecting light guide 1-2-3 can reduce the light In the reflection stroke of the connecting light guide 1-2-3, the number of reflections of the light at the lower end of the connecting light guide 1-2-3 is increased; at the same time, an outgoing light surface 10 with an arc-shaped convex arrangement is provided at the front end of the connecting light guide 1-2-3, and a plurality of first arc-shaped diffusion surfaces 11 which are spaced apart from each other and protrude outwardly from the outgoing light surface 10 are provided on the outgoing light surface 10, so that the light emitted from the connecting light guide 1-2-3 can be further dispersed outwardly through the outgoing light surface 10 and the first arc-shaped diffusion surface 11, thereby further avoiding the uneven brightness of the connecting light guide 1-2-3.

[0025] like Figure 1 , Figure 2 and Fig. 9As shown, the upper position light inner cover 2-1 in this embodiment is arranged to penetrate the mounting shell 3 from left to right, and the position light guide bar 1-1 includes an upper position light guide bar 1-1-1 which is continuously arranged from left to right at the rear end of the upper position light inner cover 2-1 and a lower position light guide bar 1-1-2 which is located at the rear end of the lower position light inner cover 2-3. In this embodiment, since the length of the upper position light guide bar 1-1-1 is relatively long, the light source also includes an upper position light source 12 which is arranged at the rear end of the mounting shell 3 and is located on the outer side of the left and right light incident ends of the upper position light guide bar 1-1-1. By respectively arranging the left and right upper position light sources 12, it is ensured that the upper position light guide bar 1-1-1 has sufficient luminous intensity. At the same time, in order to prevent the upper position light source 12 from leaking light from the left and right connection parts of the taillight, in this embodiment, a light blocking device 13 is provided on the upper position light guide bar 1-1-1 at the front end of the upper position light source 12 for blocking the sidewardly emitted light of the upper position light source 12.

[0026] Furthermore, Fig.11 As shown, in this embodiment, the lower position light guide 1-1-2 includes a main display portion 18 which is arranged in an arc shape and corresponds to the lower position light inner cover 2-3, an inwardly curved connection portion 19 which is connected to the inner end of the main display portion 18 and is gradually inclined backward, and a light entrance portion 20 which is connected to the inwardly curved connection portion 19 and is relatively parallel to the rear end of the mounting shell 3; the light source also includes a lower position light source 22 which is arranged at intervals on the outside of the light entrance portion 20; in this embodiment, the main display portion 18 on the lower position light guide 1-1-2 is located at the rear end of the lower position light inner cover 2-3 and corresponds to the lower position light inner cover 2-3 and extends from the inner end of the main display portion 18 toward the middle end of the mounting shell 3 beyond the lower position light inner cover 2-3, thereby preventing the lower position light source 22 from approaching the lower position light inner cover 2-3 and causing a bright spot to appear on the lower position light inner cover 2-3, and the light entrance portion 20 in this embodiment is bent backwards through the inwardly curved connection portion 19 and maintains a certain installation interval with the front end mounting shell 3 for installing the corresponding lower position light light source 22.

[0027] Among them, Figure 3 , Figure 7 , Fig.10 and Fig.11As shown, the turn signal light source 9, the upper position light source 12 and the lower position light source 22 include LED lamp beads 14 respectively spaced apart from the light guide bar 1 and a circuit board 15 installed on the side of the LED lamp beads 14 away from the light guide bar 1, and the circuit board 15 and the reflective shielding cover 4 surround to form a stray light shielding space, thereby preventing the light of the LED lamp beads 14 from leaking backward or outward; wherein, in this embodiment, since the light entrance portion 20 on the lower position light guide bar 1-1-2 maintains a certain installation interval with the installation shell 3, a larger circuit board 15 can be arranged on the lower position light source 22, thereby making it easier to design the circuit and to dissipate the heat of the circuit; at the same time, in order to facilitate the realization of the lighting effect and to make it more beautiful, the lower turn signal light guide bar 1-2-2 and the lower position light guide bar 1-1 -2 is gradually offset outward from top to bottom. Since the positions of the lower steering light guide 1-2-2 and the lower position light guide 1-1-2 in this embodiment are close to each other, in order to avoid mutual influence between the light sources, the light entrance portion 20 of the lower position light guide 1-1-2 in this embodiment is bent backward to a position on the same vertical plane as the lower steering light guide 1-2-2, so that the corresponding steering light source 9 and the lower position light source 22 are also on the same vertical plane. When the lower position light source 22 is turned on, the light is first blocked by the reflective shielding cover 4. Secondly, even if part of the light is emitted outward through the reflective shielding cover 4, the emitted light will be blocked by the circuit board 15 on the steering light light source 9, and thus the light cannot be directly emitted to the steering light guide 1-2, thereby ensuring the uniform light output of the steering light guide 1-2.

[0028] Further, such as Figure 3 As shown, the light blocking device 13 in this embodiment includes a connecting portion 13-1 extending outwardly from the upper position light guide 1-1-1 and a light blocking portion 13-2 fixedly connected to the connecting portion 13-1 and surrounding the front end of the upper position light source 12. The light blocking portion 13-2 extends from the upper position light guide 1-1-1 to the circuit board 15 and is in contact with the circuit board 15, so that the light blocking portion 13-2 at the front end covers and blocks the space between the upper position light guide 1-1-1 and the circuit board 15, thereby preventing the light emitted forward by the LED lamp bead 14 from emitting outward.

[0029] Furthermore, Fig. 9 and Fig.10As shown, the upper position light guide 1-1-1 in this embodiment includes a main light emitting portion 16 located in the middle part and auxiliary light emitting portions 17 located on the left and right sides of the main light emitting portion 16 and connected to the main light emitting portion 16. In this embodiment, the outer lamp cover 2 of the taillight is horizontally installed on the car backward, and there is a certain installation gap between the outer lamp cover 2 and the rear of the car. In order to prevent the light of the LED lamp beads 14 on the left and right sides from being emitted from the installation gap, in this embodiment, the auxiliary light emitting portion 17 is gradually tilted and bent backward from the connecting end, and the circuit board 15 on the upper position light source 12 on the left and right sides of the upper position light guide 1-1-1 is gradually tilted inward from front to back, so that the circuit board 15 and the light blocking portion 13-2 are correspondingly tilted relative to the installation gap. Even if part of the light is emitted from the gap between the circuit board 15 and the light blocking portion 13-2, it will be emitted to the inner surface of the rear of the car outside away from the installation gap due to the tilted circuit board 15 and the light blocking portion 13-2, thereby preventing the light from being directly emitted from the installation gap.

[0030] Furthermore, Fig.12 and Fig.13 As shown, in this embodiment, the distal reflection part 7 also includes a plurality of groups of light adjustment parts 7-2 which are vertically spaced and arranged on the vertical reflection surface 7-1 and are integrated with the light guide bar 1 for directionally reflecting the light toward the inside of the light guide bar 1. The light adjustment part 7-2 includes a pair of light adjustment surfaces 7-2-1 which are arranged at an angle and respectively form a certain angle with the vertical reflection surface 7-1. The angle α between the light adjustment surfaces 7-2-1 is set at 90°-180°, and the angle β between the light adjustment surfaces 7-2-1 and the vertical reflection surface 7-1 is set at 0°-90°. In order to avoid the occurrence of dark areas, the pair of light adjustment surfaces 7-2-1 are connected by an arc surface, and the light adjustment surface 7-2-1 and the vertical reflection surface 7-1 are also connected by an arc surface. The light adjustment part 7-2 on the upper position light guide bar 1-1-1 is arranged to protrude outward relative to the upper position light guide bar 1-1-1. Fig.12 and Fig.13 As shown, in order to ensure that the brightness of the upper position light guide bar 1-1-1 is more uniform, the intervals between the light adjustment parts 7-2 on the upper position light guide bar 1-1-1 are gradually reduced from both ends to the middle, so that the light adjustment parts 7-2 at the middle end of the upper position light guide bar 1-1-1 far away from the light source are arranged more densely, thereby increasing the light reflection area of ​​the middle end of the upper position light guide bar 1-1-1; at the same time, Fig.16 As shown, after the light in the T1 direction is reflected by the light regulating surface 7-2-1, the travel distance of the next reflection is shortened, thereby increasing the number of reflections of the light at the middle end of the upper position light guide strip 1-1-1. Correspondingly, the brightness of the middle end of the upper position light guide strip 1-1-1 far away from the light source can be the same as that of the two sides, ensuring uniform light emission of the upper position light guide strip 1-1-1. Furthermore, as Fig.16 As shown, in this embodiment, the angle between the light regulating surface 7-2-1 near the middle end of the upper light guide bar 1-1-1 (i.e., away from the light source direction) and the vertical reflecting surface 7-1 in the light regulating portion 7-2 at the left and right ends of the upper light guide bar 1-1-1 near the light source is smaller than the angle between the light regulating surface 7-2-1 on the other side (i.e., close to the light source direction) and the vertical reflecting surface 7-1, and in the direction from the outside to the inside of the upper light guide bar 1-1-1 (i.e., from the direction gradually away from the light source), the angle between the light regulating surface 7-2-1 near the middle end of the upper light guide bar 1-1-1 (away from the light source direction) and the vertical reflecting surface 7-1 gradually increases, and the angle between the light regulating surface 7-2-1 on the other side (close to the light source direction) and the vertical reflecting surface 7-1 gradually decreases until the two angles are the same when reaching the middle end of the upper light guide bar 1-1-1; as shown Fig.17 As shown, the light in the direction of Q1 is reflected by the light regulating surface 7-2-1 on one side close to the middle end of the upper light guide bar 1-1-1 and then reflected toward the middle end of the upper light guide bar 1-1-1, while the light emitted from the middle end of the upper light guide bar 1-1-1 to the two ends of the upper light guide bar 1-1-1 (i.e., the light in the direction of Q3) is reflected by the light regulating surface 7-2-1 on the other side and then re-emitted toward the middle end of the upper light guide bar 1-1-1, thereby further increasing the brightness of the middle end of the upper light guide bar 1-1-1.

[0031] Similarly, if Fig.18 As shown, the light adjustment portion 7-2 in this embodiment can also be relatively concavely arranged. In this embodiment, the light adjustment portion 7-2 in the upper turning light guide bar 1-2-1, the lower turning light guide bar 1-2-2 and the lower position light guide bar 1-1-2 is concavely arranged; correspondingly, when the light adjustment portion 7-2 is concavely arranged, the angle between the light adjustment surface 7-2-1 on the upper turning light guide bar 1-2-1, the lower turning light guide bar 1-2-2 and the lower position light guide bar 1-1-2 close to the light source and the vertical reflection surface 7-1 is smaller than the angle between the light adjustment surface 7-2-1 on the other side and the vertical reflection surface 7-1; specifically, as Fig.19 As shown, Fig.19 It is the left lower position light guide strip 1-1-2, and the light source is located on the right side of the lower position light guide strip 1-1-2; similarly, in the direction gradually away from the light source, the angle between the light adjustment surface 7-2-1 on the upper steering light guide strip 1-2-1, the lower steering light guide strip 1-2-2 and the lower position light guide strip 1-1-2 close to the light source and the vertical reflection surface 7-1 gradually increases, and the corresponding angle between the light adjustment surface 7-2-1 on the other side and the vertical reflection surface 7-1 gradually decreases, thereby correspondingly increasing the luminous intensity on the upper steering light guide strip 1-2-1, the lower steering light guide strip 1-2-2 and the lower position light guide strip 1-1-2 away from the light source.

[0032] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A light guide structure for a car taillight, comprising a light guide bar (1) and a light source arranged at one end of the light guide bar (1) for injecting light into the light guide bar (1), wherein: The light guide strip (1) comprises a position light guide strip (1-1) and a turn light guide strip (1-2). The front ends of the position light guide strip (1-1) and the turn light guide strip (1-2) are both provided with a light emitting surface (5) convexly arranged outwardly in an arc shape, and a plurality of arc-shaped inner concave surfaces (6) arranged horizontally and parallelly on the light emitting surface (5) for refracting light to the outside of the light guide strip (1). The rear ends of the position light guide strip (1-1) and the turn light guide strip (1-2) are both provided with a distal end reflection portion (7) arranged opposite to the arc-shaped inner concave surface (6). The distal end reflection portion (7) of the turn light guide strip (1-2) is provided with a reflection diffusion surface (8) connected to the arc-shaped inner concave surface (6) and arranged inwardly on both upper and lower sides.

2. A car taillight, comprising an outer lampshade (2) arranged at the front end of a light guide bar (1), a mounting housing (3) arranged outside the outer lampshade (2), and a reflective shielding cover (4) arranged at the rear end of the light guide bar (1), wherein: The automobile taillight also includes the light guide structure described in claim 1; the outer lampshade (2) includes an upper position lamp inner cover (2-1) located at the upper end and arranged horizontally, a turn signal lamp inner cover (2-2) located at the left and right sides respectively, and a lower position lamp inner cover (2-3) respectively arranged at the lower ends of the turn signal lamp inner covers (2-2) at the left and right sides; the position lamp guide strip (1-1) is arranged at the rear ends of the upper position lamp inner cover (2-1) and the lower position lamp inner cover (2-3); the turn signal lamp inner cover (2-2) includes an upper frame (2-2-1) located at the upper end and arranged horizontally, a lower frame (2-2-2) located at the lower end of the upper frame (2-2-1) and arranged to be gradually inclined upward from the outside to the inside, and a connecting inner frame (2-2-3) connecting the upper frame (2-2-1) and the lower frame (2-2-2).

3. The automobile taillight according to claim 2, characterized in that: The turn signal light guide strip (1-2) comprises an upper turn signal light guide strip (1-2-1) located at the rear end of an upper frame (2-2-1) and a lower turn signal light guide strip (1-2-2) located at the rear end of a lower frame (2-2-2); the light source comprises a turn signal light source (9) located at the inner ends of the upper turn signal light guide strip (1-2-1) and the inner ends of the lower turn signal light guide strip (1-2-2), respectively; and a connecting light guide (1-2-3) is provided at the rear end of the connecting inner frame (2-2-3) and is arranged on a side close to the turn signal light source (9) and connects the upper turn signal light guide strip (1-2-1) and the lower turn signal light guide strip (1-2-2).

4. The automobile taillight according to claim 3, characterized in that: The connecting light guide (1-2-3) is gradually tilted outward in a direction from the upper turning light guide bar (1-2-1) to the downward turning light guide bar (1-2-2), and the angle between the connecting light guide (1-2-3) and the upper turning light guide bar (1-2-1) is set at 30°-90°.

5. The automobile taillight according to claim 4, characterized in that: The connecting light guide (1-2-3) is arranged such that one end close to the turn light source (9) gradually narrows toward the end away from the turn light source (9); a front end of the connecting light guide (1-2-3) is provided with an outgoing light surface (10) which is arranged in an arcuate outward protrusion; and the outgoing light surface (10) is provided with a plurality of first arcuate diffusion surfaces (11) which are spaced from each other and protrude outward from the outgoing light surface (10).

6. The automobile taillight according to claim 3, characterized in that: The position light guide bar (1-1) comprises an upper position light guide bar (1-1-1) which is continuously arranged from left to right at the rear end of the upper position light inner cover (2-1); the light source also comprises an upper position light source (12) which is located outside the light incident ends on the left and right sides of the upper position light guide bar (1-1-1); and a light blocking device (13) is provided at the front end of the upper position light source (12) which is located on the upper position light guide bar (1-1-1) and is used for blocking the sidewardly emitted light of the upper position light source (12).

7. The automobile taillight according to claim 6, characterized in that: The turn light light source (9) and the upper position light light source (12) comprise LED lamp beads (14) respectively arranged at intervals from the light guide bar, and a circuit board (15) mounted on a side of the LED lamp beads (14) away from the light guide bar.

8. The automobile taillight according to claim 7, characterized in that: The light blocking device (13) comprises a connecting portion (13-1) arranged on the upper position light guide bar (1-1-1) and extending outward, and a light blocking portion (13-2) fixedly connected to the connecting portion (13-1) and surrounding the front end of the upper position light source (12); the light blocking portion (13-2) extends from the upper position light guide bar (1-1-1) toward the circuit board (15) and is arranged in contact with the circuit board (15).

9. The automobile taillight according to claim 7 or 8, characterized in that: The upper position light guide bar (1-1-1) comprises a main light emitting portion (16) located in the middle part and auxiliary light emitting portions (17) located on the left and right sides of the main light emitting portion (16) and connected to the main light emitting portion (16), the auxiliary light emitting portions (17) being arranged to be gradually tilted backward from the connection end, and the circuit boards (15) on the upper position light sources (12) on the left and right sides of the upper position light guide bar (1-1-1) being arranged to be gradually tilted inward from the front to the back.

10. The automobile taillight according to claim 2, characterized in that: The position light guide bar (1-1) further comprises a lower position light guide bar (1-1-2) located at the rear end of the lower position light inner cover (2-3), the lower position light guide bar (1-1-2) comprising a main display portion (18) arranged in an arc shape and corresponding to the lower position light inner cover (2-3), an inner curved connection portion (19) connected to the inner end of the main display portion (18) and arranged to be gradually inclined backwards, and a light entrance portion (20) connected to the inner curved connection portion (19) and arranged relatively parallel to the rear end of the mounting housing (3).

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