Small volume dual optical module

Abstract

This utility model discloses a small-volume dual-beam module, including a low-beam module and a lens disposed behind the low-beam module. The low-beam module includes a low-beam light source and a low-beam reflector corresponding to the low-beam light source. A light-shielding component is provided between the low-beam light source and the lens. A light guide plate is provided in the middle of the light-shielding component. The upper surface of the light guide plate is a reflective surface, the side closer to the low-beam light source is the incident surface, and the side closer to the lens is the exit surface. It also includes a high-beam light source corresponding to the incident surface of the light guide plate. The light emitted from the high-beam light source is projected into the interior of the light guide plate, and after being homogenized inside the light guide plate, it is emitted from the exit surface and projected onto the lens. The light emitted from the high-beam light source is projected into the interior of the light guide plate, and after being homogenized inside the light guide plate, it is emitted from the exit surface. Since the thickness of the upper surface of the light guide plate is negligible, no dark spots will appear between the final low-beam and high-beam light spots, resulting in a better visual effect. By using a light guide plate to homogenize the light from the high beam source, the high beam spot projected through the lens is very uniform, overcoming the problem of dark spots and greatly improving the lighting effect.

Description

Technical Field

[0001] This utility model relates to the field of lighting technology, and in particular to a small-volume dual-beam module. Background Technology

[0002] Existing bi-xenon projector headlights with integrated high and low beams typically use electromagnetic components to switch between high and low beams. This mechanical beam-switching method consumes electrical power to drive the mechanical components, increases system complexity, and is prone to malfunctions such as jamming.

[0003] To address the aforementioned issues, patent CN113028351A provides a technique for isolating high and low beams using a light-shielding plate with upper and lower reflective surfaces. This light-shielding component uses stainless steel sheets, aluminum plates, or coated reflectors. However, regardless of the material, the light-shielding plate inevitably has a certain thickness. This thickness leads to a noticeable dark area between the high and low beam spots, affecting the overall lighting effect. Patent CN218001351U places multiple high beam light sources on the side of the light-shielding plate closest to the lens, allowing the light emitted from the high beam sources to be directly projected onto the lens. However, this method requires a gap between the upper edge of the high beam source and the upper edge of the light-shielding plate; otherwise, the upper edge of the high beam spot will be blurred, making the installation of the high beam source difficult. Furthermore, since the high beam source consists of multiple LED chips, gaps inevitably exist between the light-emitting surfaces of these chips. If the light is directly projected onto the lens, it will form a strip-shaped dark spot, affecting the lighting effect.

[0004] In addition, existing high beam modules usually require the use of reflectors or TIR prisms to achieve light distribution. Regardless of which optical component is used, it will increase the difficulty of assembling lens headlights and occupy a large volume, which is not conducive to the miniaturization, especially the flattening trend of lens headlights. Utility Model Content

[0005] This utility model addresses the technical problems existing in the prior art by providing a small-volume dual-beam module that is small in size, high in brightness, and has good uniformity of near and far light.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is: a small-volume dual-beam module, including a low beam module and a lens disposed behind the low beam module. The low beam module includes a low beam light source and a low beam reflector corresponding to the low beam light source. A light shield is provided between the low beam light source and the lens. A light guide plate is provided in the middle of the light shield. The upper surface of the light guide plate is a reflective surface. The side closer to the low beam light source is the incident surface, and the side closer to the lens is the exit surface. It also includes a high beam light source corresponding to the incident surface of the light guide plate. The light emitted from the high beam light source is projected into the interior of the light guide plate. After being uniformly distributed inside the light guide plate, it is emitted from the exit surface and projected onto the lens for emission.

[0007] Furthermore, the side of the light-shielding member closest to the lens has an arc-shaped structure, and the center of the arc corresponds to the focal point of the lens.

[0008] Furthermore, the light guide plate has an arc-shaped surface structure that is adapted to the side of the light shield near the lens.

[0009] Furthermore, the light-shielding member has a groove running horizontally through its center, and the light guide plate is disposed in the groove, with the upper surface of the light guide plate flush with the upper surface of the light-shielding member.

[0010] Furthermore, the light guide plate also includes a side surface and a lower surface, and the upper surface, side surface and lower surface are all fully internally reflective surfaces.

[0011] Furthermore, the refractive index of the light guide plate is greater than 1, and the divergence angle of the beam emitted from the far-light source becomes smaller after passing through the light guide plate.

[0012] Furthermore, the light guide plate is a cone-shaped body that gradually increases in size from the incident surface to the exit surface.

[0013] Furthermore, the light guide plate is made of flat glass, and a mirror-reflective film is coated on the upper surface of the light guide plate.

[0014] Furthermore, the high beam light source includes multiple LED chips that are closely attached to the incident surface of the light guide plate, and there are gaps between the multiple LED chips.

[0015] This utility model provides a small-volume dual-beam module. By setting a light-shielding component between the near-beam light source and the lens, and placing a light guide plate in the middle of the light-shielding component, the upper surface of the light guide plate is a reflective surface. Part of the light reflected from the near-beam reflector onto the upper surface of the light guide plate is reflected and emitted from the upper part of the lens. This reflects light that would otherwise be blocked and absorbed by the light-shielding component, improving the collection efficiency of the near beam and enhancing the brightness of the central area, making the central area of ​​the near beam brighter. The light emitted from the high-beam light source is projected into the interior of the light guide plate, and after being homogenized inside the light guide plate, it is emitted from the exit surface. Since the thickness of the upper surface of the light guide plate is negligible, no dark spots appear between the final near-beam and high-beam spots, resulting in a better visual effect. Furthermore, the high-beam spot projected through the lens after homogenization of the light from the high-beam light source by the light guide plate is very uniform, overcoming the problem of dark spots and greatly improving the lighting effect. This invention has a simple structure, no complicated light-changing mechanism, is easy to assemble, and can minimize the size of the headlight, especially the top and bottom thickness, making it particularly suitable for flat lens headlights. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the optical structure of a small-volume dual-light module in a specific embodiment of this utility model;

[0017] Figure 2 This is a schematic diagram showing the relative positions of the light-shielding plate and the lens in a specific embodiment of this utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the light-shielding plate and the light guide plate in a specific embodiment of this utility model;

[0019] Figure 4 This is a schematic diagram of the near beam distribution in a specific embodiment of this utility model;

[0020] Figure 5 This is a schematic diagram of the high beam distribution in a specific embodiment of this utility model;

[0021] As shown in the figure: 110, low beam light source; 120, low beam reflector; 20, high beam light source; 210, LED chip; 30, light guide plate; 310, upper surface; 320, incident surface; 330, exit surface; 40, light shield; 50, lens. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings:

[0023] like Figure 1-3As shown, this utility model provides a small-volume dual-beam module, including a low beam module and a lens 50 disposed behind the low beam module. The low beam module includes a low beam light source 110 and a low beam reflector 120 corresponding to the low beam light source 110. In this embodiment, the low beam reflector 120 adopts an ellipsoidal reflector structure, which not only meets the required width and realizes the light distribution required for low beam, but also has good uniformity.

[0024] This small-volume dual-beam module also includes a light-shielding component 40 located between the near-beam light source 110 and the lens 50. The position of the light-shielding component 40 corresponds to the light outlet of the near-beam reflector 120. A light guide plate 30 is provided in the middle of the light-shielding component 40. The upper surface 310 of the light guide plate 30 is a reflective surface. The light emitted from the near-beam light source 110 is reflected by the near-beam reflector 120 and then projected onto the upper surface 310 of the light guide plate 30. After being reflected by the upper surface 310 of the light guide plate 30, it exits from the upper half of the lens 50, forming a near-beam distribution, such as... Figure 4 As shown.

[0025] The light guide plate 30 has an incident surface 320 on the side near the near light source 110 and an exit surface 330 on the side near the lens 50. It also includes a high-beam light source 20 corresponding to the incident surface 320 of the light guide plate 30. Light emitted from the high-beam light source 20 is projected into the interior of the light guide plate 30, homogenized within the light guide plate 30, and then exits from the exit surface 330 onto the lens 50, forming a high-beam distribution together with the light emitted from the near light source 110. Figure 5 As shown. To describe it more clearly, the light distribution formed by the rays emitted from the near beam source 110 is defined as the Q1 distribution, and the light distribution formed by the rays emitted from the far beam source 20 is defined as the Q2 distribution, i.e. Figure 4 The near-light distribution in the image is a Q1 distribution. Figure 5The high-beam distribution is formed by the superposition of Q1 and Q2 distributions, with Q2 distribution at the top and Q1 distribution at the bottom. The high-beam light source 20 includes multiple LED chips 210 closely attached to the incident surface 320 of the light guide plate 30. There are gaps between the multiple LED chips 210, and the number of LED chips 210 can be 2-5. The gap between two adjacent LED chips 210 is 0.08mm-0.1mm. If the LED chips 210 are directly projected onto the lens 50, the gaps in the middle will form discontinuous dark spots in the high-beam spot, affecting the lighting effect. Therefore, in this invention, the light from the high-beam light source 20 is homogenized by the light guide plate 30 before being projected through the lens 50, resulting in a very uniform high-beam spot, overcoming the problem of dark spots and greatly improving the lighting effect. The light guide plate 30 is made of transparent high light-guiding material. Its upper surface 310 is coated with a reflective layer to reflect the light from the near beam. The interior is used to homogenize the light emitted from the far beam source 20. Since the upper surface 310 and the thickness of the reflective layer of the light guide plate 30 are very small and can be ignored, no dark spots will appear between the Q1 distribution and Q2 distribution formed by it, resulting in a better visual effect.

[0026] Preferably, the side of the light-shielding member 40 closest to the lens 50 has an arc-shaped structure, and the center of the arc corresponds to the focal point of the lens 50. The emission surface 330 of the light guide plate 30 is an arc-shaped structure adapted to the side of the light-shielding member 40 closest to the lens 50, that is, the emission surface 330 of the light guide plate 30 and the side of the light-shielding member 40 closest to the lens 50 are linearly coincident. Since the emission surface 330 of the light guide plate 30 is located exactly at the focal point of the lens 50, the light emitted from the light guide plate 30 can be nearly collimated and output after passing through the lens 50, forming a Q2 distribution. In this invention, the light emitted from the high-beam light source 20 is projected onto the lens 50 through the exit surface 330 of the light guide plate 30 and then emitted. Essentially, the lens 50 images the exit surface 330 of the light guide plate 30. Therefore, the shape of the exit surface 330 of the light guide plate 30 determines the light pattern of the Q2 distribution. That is, the width W of the exit surface 330 corresponds to the width w of the Q2 distribution, and the height H of the exit surface 330 corresponds to the height h of the formed Q2 distribution (in this invention, the height of the incident surface 320 and the height of the exit surface 330 are the same). Figure 3 and 5 As shown, the light distribution of the exit surface 330 corresponds to the light intensity distribution of the Q2 distribution. Therefore, by changing the size of the exit surface 330, the light distribution of the formed high beam can be adjusted.

[0027] Preferably, the light guide plate 30 can be made of glass material, such as flat glass material cut from glass, which is very easy to manufacture and has low cost; and a mirror reflective film, such as a dielectric reflective film or a metal aluminum film, is coated on the upper surface of the light guide plate 30. The mirror reflective film mainly works on the low beam. It reflects part of the light reflected from the low beam reflector cup 120 to the vicinity of the focal point of the lens 50 and then emits it from the upper part of the lens 50. In this way, the light that would originally be blocked and absorbed by the light shield 40 can be reflected and output, which not only improves the collection efficiency of the low beam, but also enhances the brightness of the central area, making the central area of ​​the low beam brighter.

[0028] Preferably, the light-shielding member 40 has a groove (not shown in the figure) extending horizontally (X direction) through its center. The light guide plate 30 is disposed in the groove, and the upper surface of the light guide plate 30 is flush with the upper surface of the light-shielding member 40. Preferably, the light guide plate 30 is embedded in the groove of the light-shielding member 40, and its upper surface 310 is flush with the upper surface of the light-shielding member 40. Light is reflected from the upper surface of the light guide plate 30 and absorbed by the upper surface of the light-shielding member 40, thus forming the light-dark cutoff line required for near-light illumination. To form an ideal straight cutoff line, the end of the light-shielding member 40 near the lens 50 is designed as an arc, and the exit surface 330 of the light guide plate 30 is also designed as an arc, with their arc curves coinciding to ensure the consistency of the cutoff line. The light-shielding member 40 is preferably made of metal and has a blackened surface treatment, which not only provides good light absorption but also better heat dissipation and higher reliability.

[0029] Preferably, the light guide plate 30 further includes a side surface and a lower surface, wherein the upper surface 310, the side surface, and the lower surface are all total internal reflection surfaces. After the light emitted from the high beam source 20 enters the light guide plate 30, it undergoes total internal reflection through the upper surface 310, the side surface, and the lower surface before converging at the emission surface 330 for emission. Therefore, no light is wasted, and the light utilization rate and brightness of the high beam source 20 are improved.

[0030] Preferably, the refractive index of the light guide plate 30 is greater than 1, so that the divergence angle of the beam emitted from the high-beam source 20 decreases after passing through the light guide plate 30. Since the divergence angle of the planar LED chip is a solid angle of 2π, such a large divergence angle is detrimental to the collection by the rear lens 50. When the refractive index of the light guide plate 30 is greater than 1, the divergence angle of the beam emitted from the high-beam source 20 decreases due to light path refraction when it enters the incident surface of the light guide plate 30. Therefore, the light beam emitted from the high-beam source 20 is transmitted through the light guide plate 30 to reduce the beam divergence angle and improve the light collection efficiency of the lens 50. The light guide plate 30 can be made of glass and can be a cuboid or a cone that gradually increases in size from the incident surface to the exit surface. Since the refractive index of glass is typically greater than 1.5, between 1.5 and 1.9, the divergence angle of the high-beam source 20 can be compressed over a wide range, thereby greatly improving the collection efficiency of the high-beam beam by the lens 50.

[0031] A specific embodiment is as follows: The high beam light source 20 uses a long strip-shaped polycrystalline LED, and the light guide plate 30 is made of flat glass, which is easy to process into a mirror effect. For example, a three-core 55mil LED is selected, with a gap of 0.1mm between adjacent LED chips 210. Therefore, the size of the emitting surface of the high beam light source 20 is approximately 1.4*4.4mm. The incident surface 320 of the light guide plate 30 is flat, and its size is slightly larger than the size of the LED emitting surface, preferably 2*5mm. The distance between the emitting surface of the LED chip 210 and the incident surface 320 of the light guide plate 30 is 0.2mm. Almost all the light emitted from the LED can enter the light guide plate 30. Taking a cuboid glass as an example, its six sides are all rectangular, and the refractive index of the glass is usually greater than 1.5. Through simple calculation, it can be found that the light entering the light guide plate 30 from the incident surface 320 can undergo total internal reflection when incident on the side. A simple rectangular glass block can fulfill the function of the light guide plate 30, but using a conical light guide plate would be even better. Because the size of the incident surface of the conical light guide plate is smaller than the size of the exit surface, it better compresses the beam divergence angle. After the beam passes through the conical light guide plate 30, the angle of the output light will be smaller than the angle of the incident light. For a planar LED, its light divergence angle is 2π solid angle. Such a large divergence angle is not conducive to the collection by the rear lens 50, but after transmission through the light guide plate 30, the beam divergence angle can be reduced, improving the light collection efficiency of the lens 50.

[0032] In summary, the small-volume dual-beam module provided by this utility model, by setting a light-shielding member between the near beam light source 110 and the lens 50, and setting a light guide plate 30 in the middle of the light-shielding member 40, with the upper surface 310 of the light guide plate 30 being a reflective surface, allows some of the light reflected from the near beam reflector 120 to the upper surface 310 of the light guide plate 30 to be reflected and emitted from the upper half of the lens 50. This reflects the light that would otherwise be blocked and absorbed by the light-shielding member 40, thus improving the collection efficiency of the near beam and enhancing the brightness of the central area, making the central area of ​​the near beam brighter. The light emitted from the high beam light source 20 is projected into the interior of the light guide plate 30, and after being uniformly distributed inside the light guide plate 30, it is emitted from the emission surface 330. The thickness of the upper surface of the light guide plate 30 is negligible, so no dark spots appear between the Q1 and Q2 distributions, resulting in a better visual effect. Furthermore, the light guide plate 30 can transmit the light emitted by the high beam source 20 to the vicinity of the focal point of the lens 50, which not only achieves a uniform light effect, but also allows for changes in the size of the high beam spot and adjustment of the high beam light distribution simply by changing the size of the light guide plate 30, thus obtaining an ideal elongated Q2 distribution. This invention has a simple structure, without a complex light-changing mechanism, is easy to assemble, and can minimize the size of the vehicle headlight, especially its vertical thickness, making it particularly suitable for flat lens headlights.

[0033] Although the embodiments of this utility model have been described in the specification, these embodiments are merely illustrative and should not limit the scope of protection of this utility model. Various omissions, substitutions, and modifications made without departing from the spirit of this utility model should be included within the scope of protection of this utility model.

Claims

1. A small-volume dual-beam module, comprising a low beam module and a lens disposed behind the low beam module, wherein the low beam module includes a low beam source and a low beam reflector corresponding to the low beam source, characterized in that, A light-shielding component is provided between the low-beam light source and the lens. A light guide plate is provided in the middle of the light-shielding component. The upper surface of the light guide plate is a reflective surface. The side closer to the low-beam light source is the incident surface, and the side closer to the lens is the exit surface. The light source also includes a high-beam light source corresponding to the incident surface of the light guide plate. The light emitted from the high-beam light source is projected into the interior of the light guide plate. After being uniformly distributed inside the light guide plate, the light is emitted from the exit surface and projected onto the lens before exiting.

2. The small-volume dual-beam module according to claim 1, characterized in that, The light-shielding member has an arc-shaped structure on the side closest to the lens, and the center of the arc corresponds to the focal point of the lens.

3. The small-volume dual-beam module according to claim 2, characterized in that, The light guide plate has an arc-shaped surface structure that is adapted to the side of the light shield near the lens.

4. The small-volume dual-beam module according to claim 1, characterized in that, The light-shielding component has a groove running horizontally through its center, and the light guide plate is disposed in the groove. The upper surface of the light guide plate is flush with the upper surface of the light-shielding component.

5. The small-volume dual-beam module according to claim 1, characterized in that, The light guide plate also includes a side surface and a bottom surface, and the top surface, side surface and bottom surface are all fully internally reflective surfaces.

6. The small-volume dual-beam module according to claim 1, characterized in that, The refractive index of the light guide plate is greater than 1, and the divergence angle of the light beam emitted from the far-light source becomes smaller after passing through the light guide plate.

7. The small-volume dual-beam module according to claim 1, characterized in that, The light guide plate is a cone-shaped body that gradually increases in size from the incident surface to the exit surface.

8. The small-volume dual-beam module according to claim 1, characterized in that, The light guide plate is made of flat glass, and a mirror-reflective film is coated on the upper surface of the light guide plate.

9. The small-volume dual-beam module according to claim 1, characterized in that, The high beam light source includes multiple LED chips that are closely attached to the incident surface of the light guide plate, and there are gaps between the multiple LED chips.

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