A lens, an illumination module, a vehicle lamp and a vehicle for reducing chromatic dispersion

Abstract

This invention relates to the field of automotive lighting technology, and particularly to a lens, lighting module, automotive lamp, and vehicle for reducing chromatic dispersion. The lens for reducing chromatic dispersion of this invention includes an ellipsoidal reflecting surface, a parabolic reflecting surface, and a light-emitting surface arranged sequentially. The ellipsoidal reflecting surface includes a first geometric focus and a second geometric focus; the parabolic reflecting surface includes a third geometric focus; the second geometric focus coincides with the third geometric focus; and the light-emitting surface is disposed on the open side of the parabolic reflecting surface. The confocal coupling of the ellipsoidal and parabolic reflecting surfaces enhances the optical path coordination within the lens. The dual reflection through the combination of the two special total internal reflection surfaces not only changes the direction of light propagation, causing angle and range deflection of the light, but also reduces the chromatic dispersion problem of traditional refractive lenses from the root of the physical optical path.

Description

Technical Field

[0001] This invention relates to the field of automotive lighting technology, and in particular to a lens, lighting module, automotive lamp, and vehicle for reducing chromatic dispersion. Background Technology

[0002] Interior lighting is an essential component for vehicle safety. These lights are typically installed in the center of the front or rear seats, projecting light to both sides to illuminate the interior and facilitate observation. As the quality requirements for automotive interiors continue to rise, beyond simply illuminating specific areas, the visual effect of the lights when illuminated is receiving increasing attention.

[0003] Lighting fixtures with a specific illumination range and angle require a refraction angle. Current automotive interior lighting commonly employs the refraction principle of optical lenses to deflect light at different angles, achieving optical design requirements. Therefore, optical lenses are essential optical components in automotive lighting design. Light-emitting diodes (LEDs), due to their high luminous efficiency, long lifespan, and low energy consumption, have become the mainstream light source for automotive interior lighting. LEDs use white light as the primary light source, which is a multi-band composite visible light. Due to its dispersion characteristics, different wavelengths of light have different refractive indices in the medium. When white light is refracted through a traditional optical lens, different colors of light (different wavelengths) will be deflected at different angles, resulting in dispersion phenomena such as bluish or yellowish tints. The use of optical lenses in current automotive interior lighting leads to severe white light dispersion, resulting in mixed-color dispersion effects in the light pattern or luminous effect, seriously affecting the quality of lighting. This phenomenon has become a pain point in the industry. Summary of the Invention

[0004] In order to solve the technical problems in the background art, the purpose of this invention is to provide a lens, lighting module, vehicle lamp and vehicle for reducing dispersion, aiming to reduce the dispersion phenomenon caused by refraction as much as possible while ensuring the utilization of light efficiency, and improve the lighting quality.

[0005] A lens for reducing dispersion according to a first aspect of the present invention includes an ellipsoidal reflecting surface, a parabolic reflecting surface, and a light-emitting surface arranged sequentially. The ellipsoidal reflecting surface has a first geometric focus and a second geometric focus; the parabolic reflecting surface has a third geometric focus; the second geometric focus coincides with the third geometric focus; and the light-emitting surface is disposed on the opening side of the parabolic reflecting surface.

[0006] A lens for reducing dispersion according to an embodiment of the present invention has at least the following beneficial effects: Light rays at the first geometric focal point are reflected by the ellipsoidal reflecting surface and then converge at the second geometric focal point. Since the third geometric focal point of the parabolic reflecting surface coincides with the second geometric focal point of the ellipsoidal reflecting surface, the light rays converged at the second geometric focal point can be reflected by the parabolic reflecting surface. The convergence and propagation of light rays can be achieved through the dual reflection of the two special total internal reflection surfaces, the ellipsoidal and parabolic reflecting surfaces. The common focal point coupling of the ellipsoidal and parabolic reflecting surfaces enhances the synergy of the optical path within the lens. This not only changes the direction of light propagation, causing angle and range deflection, but also avoids the dispersion problem caused by the difference in refractive index of different wavelengths of light in traditional refractive lenses from the root of the physical optical path, thus reducing astigmatism. Compared to refractive lenses, this is more conducive to improving light efficiency.

[0007] According to some embodiments of the first aspect of the present invention, the parabolic reflective surface is disposed on the light reflection path of the ellipsoidal reflective surface, and the light-emitting surface is disposed on the light reflection path of the parabolic reflective surface.

[0008] According to some embodiments of the first aspect of the present invention, the ellipsoidal reflecting surface and the parabolic reflecting surface are smoothly connected to form a continuous inner reflecting cavity; the light emitting surface is disposed at the light emitting port of the inner reflecting cavity.

[0009] According to some embodiments of the first aspect of the present invention, the light-emitting surface is provided with a low-refractive-degree light-diffusing texture, the light-diffusing texture being an array of concave and / or convex microstructures.

[0010] An illumination module according to a second aspect of the present invention includes a light source and a lens for reducing dispersion as described in the first aspect; the light source is located at the first geometric focal point.

[0011] According to some embodiments of the second aspect of the invention, the ellipsoidal reflective surface is wrapped around the periphery of the light source so that the light source is located inside the lens used to reduce dispersion.

[0012] According to some embodiments of a second aspect of the invention, the light source is located outside the lens for reducing dispersion; the lens includes an incident surface configured to allow light emitted from the light source to be incident on the incident surface along the normal of the incident surface.

[0013] According to some embodiments of the second aspect of the invention, the light-incident surface is formed as a spherical arc surface recessed within the lens for reducing dispersion, the geometric center of the spherical arc surface coinciding with the first geometric focal point.

[0014] According to a third aspect of the present invention, a vehicle lamp includes at least one lighting module as described in the second aspect, a mounting plate for fixing the light source, and a mounting housing for fixing the lens for reducing dispersion.

[0015] A vehicle according to a fourth aspect of the present invention includes at least one headlight as described in the third aspect.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a front view of a vehicle headlight according to an embodiment of the present invention; Figure 2 yes Figure 1 Sectional view and optical path diagram of section AA; Figure 3 This is a schematic diagram of the microstructure and optical path of a light-diffusing texture according to an embodiment of the present invention; Figure 4 This is a comparison diagram of the dispersion effects of a conventional refractive lens and a lens for reducing dispersion according to an embodiment of the present invention.

[0018] Figure label: Lens 1, light-incident side 101, light-outcrystal side 102, first reflecting part 11, ellipsoidal reflecting surface 111, light-incident surface 112, second reflecting part 12, parabolic reflecting surface 121, light-amplifying part 13, light-outcrystal surface 131, light-amplifying texture 1311, light source 2, fixing plate 3, fixing housing 4, first geometric focus a, second geometric focus b, third geometric focus c, geometric center d. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the description of this invention, it should be understood that if directional descriptions are involved, such as up, down, front, back, left, right, etc., indicating the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings, it is only for the convenience of describing this invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0021] In the description of this invention, if words such as several, greater than, less than, exceeding, above, below, or within appear, then several means one or more, multiple means two or more, greater than, less than, exceeding, etc. are understood to exclude the number itself, and above, below, or within are understood to include the number itself.

[0022] In the description of this invention, the use of terms such as "first" and "second" is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or implicitly indicating the order of the technical features indicated.

[0023] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0024] like Figure 2 As shown, a lens for reducing dispersion (hereinafter referred to as lens 1) according to the present invention includes a lens body configured to be made of a transparent material with light transmission characteristics, having an incident light side 101 and an exiting light side 102; the lens body includes a first reflecting part 11, a second reflecting part 12 and a light-expanding part 13 with total internal reflection function, the first reflecting part 11, the second reflecting part 12 and the light-expanding part 13 being connected in sequence to form a closed structure with an internally interconnected optical path. In some embodiments, the first reflecting part 11, the second reflecting part 12 and the light-expanding part 13 can be integrally formed. The lens 1 has an internal optical path connecting the incident light side 101 and the exiting light side 102, including an ellipsoidal reflecting surface 111, a parabolic reflecting surface 121 and an exiting light surface 131 arranged in sequence along the optical path direction, wherein there is at least one parabolic reflecting surface 121; the exiting light surface 131 is disposed on the opening side of the parabolic reflecting surface 121.

[0025] An ellipsoidal reflecting surface 111 is disposed on the first reflecting part 11, and has two geometric foci unique to the geometry of an ellipsoid, designated as the first geometric focus a and the second geometric focus b. The first geometric focus a is farther away from the second reflecting part 12 than the second geometric focus b, while the second geometric focus b is closer to the second reflecting part 12 than the first geometric focus a. According to the optical characteristics of the ellipsoidal reflecting surface, light rays emitted from the first geometric focus a converge at the second geometric focus b after being reflected by the ellipsoidal reflecting surface 111.

[0026] The second reflector 12 receives light from the first reflector 11 and projects the light onto the amplifying part 13 after total internal reflection. A parabolic reflective surface 121 is disposed on the second reflector 12 and has a geometric focal point characteristic of parabolic geometry, designated as the third geometric focal point c of the lens, which coincides with the second geometric focal point b. Based on the optical characteristics of the parabolic reflective surface 121, it has the characteristic of collimating the light emitted from the third geometric focal point c.

[0027] It is understandable that the geometric properties of an ellipsoid, which have two unique geometric foci, and the geometric properties of a parabola, which have only one unique geometric foci, are all common knowledge in the field of optics. Therefore, this invention will not elaborate on the calculation and positioning methods of the foci, and will not go into detail here.

[0028] The ends of the light-expanding section 13 and the second reflective section 12 are connected and enclosed together. A light-emitting surface 131 is disposed on the light-expanding section 13, located on the light-emitting side 102 of the lens 1. The light-emitting surface 131 has a low-refractive-degree light-expanding texture 1311, such as... Figure 3 As shown; preferably, the light-diffusing texture 1311 is an array of concave and / or convex microstructures. The light-diffusing texture 1311 is used to diffuse the light projected onto it. The light diffused by the light-diffusing texture 1311 has a large angular range to meet the light distribution requirements of the predetermined lighting area. On the one hand, the light is diffused by the light-diffusing texture 1311 to an angle that meets the size of the preset lighting area, thereby illuminating the specific lighting area. When the light passes through the light-diffusing texture 1311, the propagation direction is scattered and diffused only through the random or regular changes in the geometry of the light-diffusing texture 1311, producing only a small amount of diffuse scattering, without changing the main propagation direction of the light, thus without producing refractive refraction and dispersion. On the other hand, the light-diffusing texture 1311 can play a role in uniform light distribution, forming a more aesthetically pleasing visual effect.

[0029] In one embodiment, the first reflective portion 11 and the second reflective portion 12 are configured as hollow structures. The inner wall of the first reflective portion 11 is a first inner wall and is configured as an ellipsoidal reflective surface 111. The inner wall of the second reflective portion 12 is a second inner wall, and at least one surface of the second inner wall is configured as a parabolic reflective surface 121. The first reflective portion 11, the second reflective portion 12, and the light-amplifying portion 13 are provided with interconnected optical paths.

[0030] A parabolic reflective surface 121 is disposed on the light reflection path of an ellipsoidal reflective surface 111, and a light-emitting surface is disposed on the light reflection path of the parabolic reflective surface 121 to receive the light rays after total internal reflection by the parabolic reflective surface 121. The tail of the ellipsoidal reflective surface 111 wraps around the outer periphery of the second geometric focus b and is smoothly connected to the parabolic reflective surface 121, forming a continuous inner reflection cavity that is concave in the middle and wide at both ends. The light-emitting surface 131 is disposed at the light-emitting port of the inner reflection cavity and faces the light-emitting port of the inner reflection cavity.

[0031] More specifically, the light-emitting surface 131 is configured to be perpendicular to the line connecting the first geometric focus a and the second geometric focus b / third geometric focus c.

[0032] In some embodiments, the light-emitting surface may be configured to be positioned opposite to the parabolic reflective surface 121.

[0033] At the first geometric focus a, part of the light ray passes directly through the first reflector 11 and the second reflector 12 and is emitted to the light-emitting surface 131 of the light-expanding section 13. Another part is reflected by the ellipsoidal reflector 111 and converges to the second geometric focus b. At the second geometric focus b, part of the light ray passes directly through the second reflector 12 and is emitted to the light-emitting surface 131 of the light-expanding section 13. The remaining part is reflected by the ellipsoidal reflector 111 and becomes collimated light, which is then directed to the light-emitting surface 131 of the light-expanding section 13. During this process, the light follows the principle of total internal reflection, and no refraction or dispersion occurs. Since the law of total internal reflection is independent of wavelength, light of different wavelengths maintains the same propagation direction after total internal reflection. Therefore, the emitted light retains its original spectral composition and does not produce dispersion separation. Through the special combination design of the ellipsoidal reflector 111 and the parabolic reflector 121, the dispersion-free characteristic of the reflected light path can be used to change the propagation direction of the light, rather than through refraction. This avoids the deflection of the angle and range of the light ray through refraction, thus helping to reduce white light dispersion. This invention optimizes the optical path design through total internal reflection, which helps to improve the efficiency of light energy utilization.

[0034] Please see Figure 4 The following is a comparison of the dispersion effects of a conventional refractive lens (upper half) and the lens for reducing dispersion of the present invention (lower half): The center (B') and edge (A') of the light spot emitted by the conventional refractive lens are clearly separated on the CIE chromaticity diagram, indicating that the light undergoes severe color shift (i.e., dispersion) after refraction; while the center (B) and edge (A) of the light spot emitted by the lens for reducing dispersion of the present invention are highly coincident, and the chromaticity deviation between the center and the edge is extremely small. From a quantitative data perspective, this proves that the lens for reducing dispersion of the present invention significantly suppresses the dispersion phenomenon of white light.

[0035] An embodiment of the second aspect of the present invention provides an illumination module comprising at least one lens for reducing dispersion as described above and a light source 2. The lens 1 is disposed downstream of the light path of the light source 2, projecting light onto the area requiring illumination. The light source 2 is located at a first geometric focal point a. The light source 2 projects light onto an ellipsoidal reflective surface 111, where it is reflected and focused to a second geometric focal point b. The light focused at the second geometric focal point b is then reflected by a parabolic reflective surface 121 to the light-emitting surface 131 of a light-expanding section 13. Depending on the actual structure of the first reflective section 11, the light source 2 may be located in front of the light-incident side 101 of the lens 1 or inside the first reflective section 11.

[0036] In some embodiments, the light source 2 is a point light source or a very small line light source, preferably an LED light source that emits white light.

[0037] In some embodiments, the light source 2 is located inside the first reflective part 11, and the ellipsoidal reflective surface 111 wraps around the outer periphery of the light source 2, which is beneficial for the lens to collect and reflect as much light emitted by the light source as possible.

[0038] In some embodiments, the light source 2 is located outside the first reflective portion 11; more specifically, the light source 2 may be located in front of the light-incident side 101 of the lens 1. The lens 1 is sequentially provided with a light-incident surface 112, an ellipsoidal reflective surface 111, a parabolic reflective surface 121, and a light-emitting surface 131. The light-incident side 101 of the first reflective portion 11 facing the light source is provided with a light-incident surface 112 for receiving light from the light source, and the light-incident surface 112 is configured as a transparent material with light transmission characteristics. The light source 2 is located in front of the light-incident surface 112 of the first reflective portion 11, facing the light-incident surface 112. The light-incident surface 112 is located downstream of the light path of the light source 2, and the light emitted by the light source 2 is incident on the light-incident surface 112 along the normal direction of the light-incident surface 112.

[0039] Furthermore, the incident surface 112 is configured such that the light emitted by the light source 2 is incident on the incident surface 112 along the normal direction of the incident surface 112.

[0040] In some embodiments, the light-incident surface 112 is formed as a spherical arc surface recessed within the first reflecting portion 11 of the lens used to reduce dispersion. It has a geometric center d characteristic of the geometry of a spherical arc surface, and the geometric center d of the spherical arc surface coincides with the first geometric focus a of the first reflecting portion 11. Light emitted from a point light source located at the first geometric focus a is incident on the light-incident arc surface along the radial direction of the spherical arc surface at an incident angle of zero or close to zero. The light from the point light source enters the lens 1 directly and perpendicularly without deflection. This avoids refraction of the light source light when it passes through the interface of the light-incident surface 112 of the lens, thus preventing dispersion. Furthermore, the spherical arc surface facilitates the collection of diverging light from the point light source at large angles, which is beneficial for improving light energy utilization. It is understood that, based on the geometric properties of the spherical arc surface, it has one and only one geometric center. The rules for locating the center are common knowledge in the field of optics, and the calculation and location methods of the center will not be elaborated upon here.

[0041] In some embodiments, the lighting module includes a light source and at least two lenses, the lenses sharing the same light source, and the lenses may be evenly distributed around the same light source.

[0042] like Figure 2 As shown, an embodiment of the vehicle lamp of the third aspect of the present invention includes at least one lighting module as in the second aspect, a fixing plate 3 for fixing the light source 2, and a fixing housing 4 for fixing the lens used to reduce dispersion. More specifically, the fixing plate 3 is located on and faces the light-incident side 101 of the lens 1, and the fixing housing 4 is fixedly connected to the outer wall of the light-expanding portion 13 of the lens 1. In other embodiments, the fixing housing 4 may also be designed to fix other parts or multiple parts of the lens 1, such as the first reflective portion 11 / second reflective portion 12. This achieves weakly dispersed white light illumination while ensuring high light efficiency.

[0043] In some embodiments, a single headlight may contain multiple lighting modules arranged side by side.

[0044] The vehicle according to a fourth aspect of the present invention includes at least one headlight as described in the third aspect, which eliminates the bluish or yellowish tint at the edges of the headlight beam, resulting in uniform and clean illumination and improving the visual comfort of vehicle lighting. More specifically, the headlight is installed in the middle of the front or rear seats of the vehicle, projecting light to the sides or front and rear of the vehicle interior.

[0045] In the description of this specification, the use of terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," and "some examples" indicates that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0046] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A lens for reducing dispersion, characterized in that, It includes an ellipsoidal reflecting surface, a parabolic reflecting surface, and a light-emitting surface arranged sequentially. The ellipsoidal reflecting surface has a first geometric focus and a second geometric focus; the parabolic reflecting surface has a third geometric focus; the second geometric focus and the third geometric focus coincide. The light-emitting surface is located on the opening side of the parabolic reflective surface.

2. The lens for reducing dispersion as described in claim 1, characterized in that, The parabolic reflective surface is disposed on the light reflection path of the ellipsoidal reflective surface, and the light-emitting surface is disposed on the light reflection path of the parabolic reflective surface.

3. The lens for reducing dispersion as described in claim 1, characterized in that, The ellipsoidal reflective surface and the parabolic reflective surface are smoothly connected to form a continuous inner reflective cavity; the light-emitting surface is located at the light-emitting port of the inner reflective cavity.

4. The lens for reducing dispersion as described in claim 1, characterized in that, The light-emitting surface is provided with a light-diffusing texture with low refractive power, and the light-diffusing texture is an array of concave and / or convex microstructures.

5. A lighting module, characterized in that, It includes a light source and a lens for reducing dispersion as described in any one of claims 1 to 4; the light source is located at the first geometric focal point.

6. The lighting module as described in claim 5, characterized in that, The ellipsoidal reflective surface wraps around the periphery of the light source so that the light source is located inside the lens used to reduce dispersion.

7. The lighting module as described in claim 5, characterized in that, The light source is located outside the lens for reducing dispersion; the lens for reducing dispersion includes an incident surface configured to allow light emitted from the light source to enter the incident surface along the normal of the incident surface.

8. The lighting module as described in claim 7, characterized in that, The light-incident surface is formed as a spherical arc surface recessed within the lens used to reduce dispersion, and the geometric center of the spherical arc surface coincides with the first geometric focal point.

9. A vehicle light, characterized in that, It includes at least one lighting module as described in any one of claims 5 to 8, a mounting plate for fixing the light source, and a mounting housing for fixing the lens for reducing dispersion.

10. A vehicle, characterized in that, Includes at least one vehicle light as described in claim 9.

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