Thin optical structure capable of forming cut-off line
By employing a combined optical structure of light source, thick-walled light guide component, and refractive unit, the problems of projection angle and uniformity in vehicle headlight design are solved, achieving large-angle projection and uniform lighting effects.
Patent Information
- Application Number
- CN202520233298.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-13
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2035-02-13
AI Technical Summary
Existing headlight designs struggle to simultaneously meet the requirements of a wide horizontal projection angle, clear distinction between light and dark areas, uniform projection onto the road surface, and uniform illumination.
A thin optical structure including a light source, a thick-walled light guide component, and a refractive unit is adopted. Through the combination of a curved light-incident section, a reflection unit, and a light-outceasing section, the initial shaping, reflection, and diffusion of light are achieved, meeting performance requirements while ensuring illumination uniformity.
It achieves large-angle projection of light in the horizontal direction, ensuring uniform projection on the road surface and taking into account the uniformity of illumination, thus meeting the performance requirements of corner fog lights and low beam extension.
Smart Images
Figure CN223609939U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of car light, especially to a thin optical structure capable of forming a cutoff line. BACKGROUND
[0002] Generally, in order to be applicable to the optical system of corner fog lamp and low beam, it is required to realize a wide projection angle in the horizontal direction, have a clear and dark boundary, and project uniformly on the road surface.
[0003] In addition, more and more host factories also require the realization of the same lighting uniformity as the signal lamp. The existing solutions, including LED + lens (or reflector) direct projection, or light source + primary optical unit + imaging unit similar solutions, are difficult to simultaneously meet the performance and lighting effect, especially the lighting uniformity. SUMMARY
[0004] The technical problem to be solved by the utility model is: in order to solve the technical problems in the prior art, the utility model provides a thin optical structure capable of forming a cutoff line, which can not only realize the required performance requirements, but also project uniformly and take into account the lighting uniformity.
[0005] The technical scheme adopted by the utility model to solve the technical problem is: a thin optical structure capable of forming a cutoff line, comprising a light source, a light guide thick wall piece, and a refraction unit; wherein the light guide thick wall piece comprises a curved surface light inlet portion, a plurality of reflection units, and a light guide light outlet portion, and the curved surface light inlet portion is provided with at least one; the curved surface light inlet portion receives the light emitted by the light source and preliminarily shapes it in one direction; the reflection units are arranged on both sides of each curved surface light inlet portion, and reflect the light rays refracted by the curved surface light inlet portion to the light guide light outlet portion; the light guide light outlet portion is arranged in the positive direction of light emission of the curved surface light inlet portion and the reflection unit, and diffuses the received light rays in the light emission angle; the refraction unit is located in the positive direction of light emission of the light guide thick wall piece, and further expands the light emission angle of the light rays from the light guide light outlet portion.
[0006] The thin optical structure capable of forming a cutoff line of the utility model emits light rays, the curved surface light inlet portion receives the light emitted by the light source and preliminarily shapes it in one direction, the reflection unit reflects the light rays refracted by the curved surface light inlet portion to the light guide light outlet portion, the light guide light outlet portion expands the light emission angle of the received light rays, and the refraction unit further expands the light emission angle of the light rays received from the light guide light outlet portion, thereby meeting the performance requirements, projecting uniformly, and taking into account the lighting uniformity.
[0007] Further, the light emission center of the light source is located at or near the focal point of the curved surface light inlet portion of the light guide thick wall piece.
[0008] Further, the curved light inlet part can collimate the light emitted at the focal point in one direction; in the vertical direction, the profile line of the curved light inlet part contains a circular arc, a straight line or a curve.
[0009] Further, the two reflection units arranged on both sides of the curved light inlet part are symmetrical or asymmetrical along the axis passing through the focal point of the light inlet part and parallel to the light emission direction.
[0010] Further, the two reflection units are at an angle to the light emission direction.
[0011] Further, the reflection units are inclined planes or curved surfaces.
[0012] Further, each of the reflection units is a complete surface or is formed by multiple surfaces in a stepped manner.
[0013] Further, the refractive unit is located on the light emission direction of the light inlet part and the reflection unit, and the refractive unit has vertical stripes.
[0014] Further, the refractive unit contains a light inlet part and a light outlet part, and the vertical stripes are arranged on the light inlet part and / or the light outlet part of the refractive unit.
[0015] A vehicle lamp comprises the thin optical structure capable of forming a cutoff line.
[0016] The light source emits light, the curved light inlet part receives the light emitted by the light source and preliminarily shapes the light in one direction, the reflection unit reflects the light refracted by the curved light inlet part to the light guide light outlet part, the light guide light outlet part enlarges the light emission angle of the received light, and the reflection unit further enlarges the light emission angle of the light received from the light guide light outlet part, thereby meeting the performance requirements, being able to project uniformly, and taking into account the uniformity of lighting. BRIEF DESCRIPTION OF DRAWINGS
[0017] The utility model is further described below in combination with the drawings and examples.
[0018] Figure 1 is the structure schematic view of the thin optical structure capable of forming a cutoff line as a whole in the utility model.
[0019] Figure 2 is the cross section light path schematic view of the thin optical structure capable of forming a cutoff line in the utility model.
[0020] In the drawing: 1, light source; 2, light guide thick wall piece; 21, curved light inlet part; 22, reflection unit; 23, light guide light outlet part; 3, refractive unit. DETAILED DESCRIPTION
[0021] The utility model will be described further in detail in combination with the drawings. These drawings are all simplified schematic diagrams, and only schematically show the basic structure of the utility model, so they only show the structure related to the utility model.
[0022] In the description of the utility model, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, so it cannot be understood as a limitation on the utility model. In addition, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, unless otherwise specified, the meaning of "multiple" is two or more. In the description of the utility model, it needs to be explained that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0023] The utility model discloses a kind of thin optical structure capable of forming cut-off line.
[0024] Referring to Figure 1 And Figure 2 , define the light direction as Z, the horizontal direction as X, and the vertical direction as Y. A kind of thin optical structure capable of forming cut-off line includes light source 1, light guide thick wall piece 2 and refractive unit 3, wherein, light guide thick wall piece 2 includes curved surface light inlet portion 21, multiple reflection units 22 and light guide light outlet portion 23, curved surface light inlet portion 21 is equipped with at least one.
[0025] Embodiment 1:
[0026] The light-emitting center of light source 1 is located at or near the focal point of curved surface light inlet portion 21. When used for low beam auxiliary function, the light-emitting center of light source 1 is not located at the focal point, but deviates by a certain distance. The preferred distance of deviation is not more than 3 times the distance of the LED light-emitting length. In the vertical plane parallel to the Z axis beyond the focal point, the profile line of curved surface light inlet portion 21 in the plane is a curve, which can realize the collimation of the light rays emitted at the focal point.
[0027] It should be noted that the profile of the curved light entrance portion 21 contains the above-mentioned collimation function, but is not limited to only the collimation function, and can also have only a simple light collection function.
[0028] In a horizontal plane parallel to the Z axis, the profile of the curved light entrance portion 21 in the plane contains a circular arc segment, i.e., the circular arc segment enables the light emitted from the light entrance portion focal point to pass through the circular arc segment without changing the original light propagation direction, i.e., the light entrance portion is mainly formed by rotating the profile in the vertical plane around the vertical axis passing through the focal point. The curved light entrance portion 21 can realize collimation of light in one direction, preferably in the vertical direction.
[0029] In another embodiment, in a horizontal plane parallel to the Z axis, the profile of the light entrance portion can contain a straight line portion, i.e., the profile in the vertical plane is stretched in the horizontal direction.
[0030] In another embodiment, in a horizontal plane parallel to the Z axis, the profile of the light entrance portion can contain a curved portion, and the curve has a collimating effect on the light.
[0031] One reflective unit 22 is placed on each side of the curved light entrance portion 21, and preferably, the two reflective units 22 are symmetrically arranged along the vertical plane passing through the focal point F. The two reflective units 22 have a mirror function, reflecting the light from the curved light entrance portion 21 to the light exit portion. The angle between the reflective unit 22 and the Z axis in the horizontal plane is preferably 10 to 25°, but is not limited thereto, and can also be 5 to 60°. The reflective unit 22 can have a reflective function by internal total reflection or partial or total coating of a reflective film.
[0032] The light guide light exit portion 23 is arranged in the light exit direction of the reflective unit 22, and preferably, when used for low-beam assistance, the light guide light exit portion 23 expands the refraction angle of the received light in one direction. When used for low-beam widening or corner fog lamp, it is mainly required to expand the refraction angle in the horizontal direction. The light exit portion surface is attached with vertical stripes, or attached with a grid film, to expand the light refraction angle. Alternatively, the light exit portion, the reflective unit 22 and the curved light entrance portion 21 can be an integral thick-walled piece.
[0033] In the light exit direction of the thick-walled piece, a refraction unit 3 can be further arranged. The refraction unit 3 contains a light entrance portion and a light exit portion, and the refraction unit 3 has a similar function to the light exit portion of the thick-walled piece, and can further diffuse the exit angle; when used for corner fog lamp or low-beam assistance, it is preferred to expand the exit angle in the horizontal direction, and increase the horizontal projection width. The light entrance portion and / or the light exit portion of the refraction unit 3 are attached with vertical stripes, or the surface of the refraction unit 3 is attached with a soft grid film, or the refraction unit 3 itself is a hard grid film, so as to diffuse the light refraction angle.
[0034] Embodiment 2:
[0035] Different from the embodiment 1, the light emitting center of the light source 1 can be offset from the focal point by a certain distance in the vertical direction; when applied to the high beam expansion and the corner fog lamp, the light emitting center of the light source 1 is offset upward relative to the focal point, and the light emitting surface boundary of the light source 1 serves as the bright-dark cutoff line.
[0036] Embodiment 3:
[0037] Different from the embodiment 1, the reflection units 22 on both sides are not symmetrically distributed along the vertical plane passing through the focal point. In addition, the reflection surfaces on both sides can be planar or curved; and the light distribution in the horizontal focal plane can be preliminarily adjusted according to requirements. In addition, the reflection unit 22 can be a complete mirror surface or formed by multiple segments of surfaces in a stepped manner.
[0038] Embodiment 4:
[0039] Each curved light inlet portion 21 can correspond to one single-core LED light source 1; and each curved light inlet portion 21 can also correspond to a single multi-core LED light source 1.
[0040] Embodiment 5:
[0041] A baffle can be arranged between the light source 1 and the curved light inlet portion 21 to achieve the bright-dark cutoff line.
[0042] Working principle: the light emitted by the light source 1 is collimated as parallel light in the vertical direction, i.e., the curved light inlet portion 21 has the function of imaging the light source 1 mainly in the vertical direction; after collimation, the light is sequentially transmitted through the light outlet portion and the refractive unit 3, and the two optical elements diffuse the received light in the horizontal direction, greatly increasing the projection angle in the horizontal direction; the large-angle projection can be achieved, and the road surface projection is uniform.
[0043] In addition, the two horizontal diffusion units can further homogenize the light exit angle and achieve the effect of uniform lighting.
[0044] Based on the above ideal embodiments according to the present application, through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the contents in the specification, and must be determined according to the scope of the claims.
Claims
1. A slim optical structure capable of forming a cutoff line, characterized in that, It includes a light source (1), a light guide thick-walled component (2), and a refractive unit (3); The light-guiding thick-walled component (2) includes a curved light-incident section (21), multiple reflective units (22) and a light-guiding light-out section (23), wherein the curved light-incident section (21) is provided with at least one; The curved light-incident section (21) receives the light emitted by the light source (1) and performs preliminary shaping on it in one direction; A reflective unit (22) is provided on both sides of each curved light-incident part (21) to reflect the light refracted by the curved light-incident part (21) to the light-guiding light-out part (23); A light-guiding light-emitting part (23) is provided in the positive direction of light emission from the curved light-incident part (21) and the reflective unit (22), and the light-guiding light-emitting part (23) diffuses the received light at the light emission angle; The refractive unit (3) is located in the positive direction of light emission from the light guide thick-walled member (2), thereby further expanding the emission angle of the light from the light guide light emission part (23).
2. The slim optical structure capable of forming a cutoff line according to claim 1, wherein, The light-emitting center of the light source (1) is located at or near the focal point of the curved light-incident part (21) of the light-guiding thick-walled member (2).
3. The slim optical structure capable of forming a cutoff line according to claim 1, wherein, The curved light-incident part (21) can collimate the light emitted from the focal point in one direction; in the vertical direction, the outline of the curved light-incident part (21) includes an arc, a straight line or a curve.
4. The slim optical structure capable of forming a cutoff line according to claim 1, wherein, The two reflective units (22) located on both sides of the curved light-incident section (21) are either axially symmetrical or asymmetrical along the light-incident section focal point and parallel to the light-out direction.
5. A slim optical structure capable of forming a cutoff line according to claim 1, wherein, The two reflective units (22) are at a certain angle to the light emission direction.
6. A slim optical structure capable of forming a cutoff line according to claim 5, wherein, The reflective unit (22) is an oblique plane or a curved surface.
7. A slim optical structure capable of forming a cutoff line according to claim 6, wherein, Each of the reflective units (22) is a complete surface or is formed by splicing multiple surfaces in a stepped manner.
8. A slim optical structure capable of forming a cutoff line according to claim 1, wherein, The refractive unit (3) is located in the light-incident section and the light-outcrying section (22) is in the positive direction. The refractive unit (3) has vertical stripes.
9. A slim optical structure capable of forming a cutoff line according to claim 8, wherein, The refractive unit (3) includes an incident light portion and an exit light portion, and the vertical stripes are disposed on the incident light portion and / or the exit light portion of the refractive unit (3).
10. A vehicle lamp characterized by Includes a thin optical structure capable of forming a cutoff line as described in any one of claims 1-9.