Bifocal optical unit, optical module and vehicle lamp

Abstract

The invention discloses a bifocus optical unit, an optical module and a vehicle lamp, and relates to the technical field of vehicle lighting, the bifocus optical unit comprises a first optical surface and a light emitting structure which are sequentially arranged in the light path transmission direction, and further comprises a first focus and a second focus which are sequentially arranged in the light path transmission direction, the first focus is located on the side, away from the light-emitting structure, of the first optical surface, the second focus is located between the first optical surface and the light-emitting structure, parallel light rays can be refracted by the light-emitting structure and then converged to the second focus in the direction opposite to the light path transmission direction, and the light rays converged to the second focus can continue to be transmitted to the first optical surface. After being refracted by the first optical surface, the light can converge to the first focus. According to the bifocus optical unit, the optical module and the vehicle lamp, diversified configuration of emergent light shapes can be achieved by adjusting multiple focal lengths in the bifocus optical unit.

Description

Dual-focus optical unit, optical module and vehicle lamp Technical Field

[0001] The present application relates to the field of vehicle lighting technology, and in particular to a dual-focus optical unit, an optical module, and a vehicle lamp. Background Art

[0002] In recent years, car lights and headlamp modules installed in car lights have developed rapidly, from the early halogen lamps to the later xenon lamps, and then to the current LED and laser light sources, making car lights more intelligent and more differentiated in appearance. Among various car light sources, LED light sources are gradually gaining attention from car manufacturers due to their excellent performance and low cost advantages. With the development of LED light sources, the light distribution structure of car lights is also gradually developing. The projection lighting system of LED light sources commonly used in car lights in the existing technology generally includes a light source, a reflective element, a sunshade and an optical lens. The light emitted by the light source is reflected by the reflective element and then directed to the sunshade. After being blocked by the sunshade, it is projected by the optical lens to form a quasi-parallel light illumination light shape with a light and dark cut-off line.

[0003] In the prior art, the optical lenses in automobile headlights are usually plano-convex lenses or biconvex lenses. Among them, both plano-convex lenses and biconvex lenses have only one focal point, and each has a focal length corresponding to the focal point. In projection lighting systems, adjusting the focal length is an important means of adjusting the light shape parameters of the headlight. However, since the lenses in the prior art have only one focal length, the means of adjusting the parameters are limited. In addition, since there is only one focal point, the cut-off line structure such as the visor that forms the near-bright light and dark cut-off line can only be set at this focal point, which has certain limitations in light distribution.

[0004] Summary of the Invention

[0005] The purpose of the present application is to provide a dual-focus optical unit, an optical module and a vehicle lamp, which can achieve diversified configuration of the output light shape by adjusting multiple focal lengths in the dual-focus optical unit.

[0006] In order to achieve the purpose of this application, the following technical solutions are adopted:

[0007] On the one hand, an embodiment of the present application provides a dual-focus optical unit, including a first optical surface and a light-emitting structure arranged in sequence along the light transmission direction, and also including a first focus and a second focus arranged in sequence along the light transmission direction, the first focus is located on the side of the first optical surface away from the light-emitting structure, and the second focus is located between the first optical surface and the light-emitting structure. In the opposite direction of the light transmission direction, parallel light rays can be refracted by the light-emitting structure and converge to the second focus, and the light rays converged to the second focus can continue to be transmitted to the first optical surface, and can converge to the first focus after being refracted by the first optical surface.

[0008] As an implementable manner, the bifocal optical unit is a transparent integral part, the first focus is located outside the bifocal optical unit, the second focus is located inside the bifocal optical unit, and the light output structure is the second optical surface.

[0009] As an implementable manner, both the first optical surface and the second optical surface are protruded outward to form convex surfaces.

[0010] As an implementable method, the dual-focus optical unit includes multiple first optical surfaces, a second optical surface, multiple first focal points and a second focus. The multiple first optical surfaces are connected in sequence, and the first optical surfaces correspond to the first focal points one by one. Along the opposite direction of the light path transmission direction, parallel light can be refracted by the second optical surface and converged to the second focus. The light converged to the second focus can continue to be transmitted to each first optical surface, and can converge to the corresponding first focus after being refracted by the first optical surface.

[0011] As an implementable method, the dual-focus optical unit includes a first optical surface, multiple second optical surfaces, a first focus and a second focus. The multiple second optical surfaces are connected in sequence. Along the opposite direction of the light path transmission direction, parallel light can be refracted by each second optical surface and then converged to the second focus. The light converged to the second focus can continue to be transmitted to the first optical surface and can converge to the first focus after being refracted by the first optical surface.

[0012] As an implementable method, a first recess is formed at the lower portion of the dual-focus optical unit, the first recess having a total reflection surface and a third optical surface, a light-dark cutoff line structure is formed at the intersection of the total reflection surface and the third optical surface, the second focus is located on or near the light-dark cutoff line structure, the total reflection surface is connected to the first optical surface, and part of the light incident from the first optical surface can hit the total reflection surface and be totally reflected to the second optical surface.

[0013] As an implementable manner, a high beam incident portion is connected below the first optical surface, the incident surface of the high beam incident portion is connected to the first optical surface, the exit surface of the high beam incident portion is connected to the total reflection surface and is arranged opposite to the third optical surface.

[0014] As an implementable manner, a second recess is formed on the upper portion of the dual-focus optical unit, the second recess has a fourth optical surface and a bottom surface, a light-dark cutoff line structure is formed at the intersection of the fourth optical surface and the bottom surface, and the second focus is located on the light-dark cutoff line structure or near the light-dark cutoff line structure.

[0015] As an implementable manner, the third optical surface is a cylindrical surface or a quasi-cylindrical surface.

[0016] As an implementable manner, a cutoff line structure is formed on the upper surface of the dual-focus optical unit, the second focus is located on or near the cutoff line structure, and the second optical surface is located below the optical axis of the first optical surface.

[0017] As an implementable method, the dual-focus optical unit includes a first optical element and a second optical element, and the first optical element is provided with a first optical surface and a first one-way collimating surface in sequence along the light path transmission direction, and the second optical element is provided with a second optical element light incident surface and a second one-way collimating surface in sequence along the light path transmission direction. The first one-way collimating surface, the second optical element light incident surface and the second one-way collimating surface together constitute a light output structure, and parallel light can be refracted through the second one-way collimating surface, the second optical element light incident surface and the first one-way collimating surface in sequence and then converged to the second focus. The light converged to the second focus can continue to be transmitted to the first optical surface, and can converge to the first focus after being refracted through the first optical surface.

[0018] On the other hand, an embodiment of the present application provides an optical module, including any of the above-mentioned dual-focus optical units, and also including a light source and a low-beam focusing unit arranged on the light-emitting side of the light source, and the dual-focus optical unit is arranged in the light-emitting direction of the low-beam focusing unit.

[0019] As an implementable manner, the optical module includes the dual-focus optical unit of the above-mentioned aspect, and the low-beam focusing unit is any one of a parabolic reflector, a quasi-parabolic reflector, an ellipsoidal reflector or a quasi-spherical reflector; or, the low-beam focusing unit is a light guide having a parabolic reflector surface, a quasi-parabolic reflective surface, an ellipsoidal reflective surface or a quasi-ellipsoidal reflective surface; the low-beam focusing unit can direct the light emitted by the light source to the dual-focus optical unit in a roughly parallel manner, and the first focus is set at or near the boundary of the low-beam focusing unit close to the light source, and a light-dark cutoff line structure is set at the boundary of the low-beam focusing unit close to the light source.

[0020] As an implementable method, the optical module includes the dual-focus optical unit of the above-mentioned other aspect, and also includes a high-beam focusing unit, which is an ellipsoidal reflector or a quasi-ellipsoidal reflector. The high-beam focusing unit can focus the light emitted by the light source to the second focus through the first recess.

[0021] As an implementable method, the optical module includes the dual-focus optical unit of the above-mentioned further aspect, and also includes a high-beam focusing unit. The high-beam focusing unit is any one of a parabolic reflector, a quasi-parabolic reflector, an ellipsoidal reflector or a quasi-ellipsoidal reflector. The high-beam focusing unit can direct the light emitted by the light source to the dual-focus optical unit in a roughly parallel manner, and transmit it to the second light-emitting surface through the high-beam light entrance portion and the first recess in sequence.

[0022] As an implementable method, the optical module includes the dual-focus optical unit of the above-mentioned aspect, the low-beam focusing unit is an ellipsoidal reflector or a quasi-ellipsoidal reflector, the low-beam focusing unit can focus the light emitted by the light source to the second focus, and the light source is set at the first focus or near the first focus.

[0023] As an implementable method, the optical module also includes a high beam focusing unit, which is any one of a parabolic reflector, a quasi-parabolic reflector, an ellipsoidal reflector or a quasi-ellipsoidal reflector. The high beam focusing unit can direct the light emitted by the light source roughly in parallel to the dual-focus optical unit, and transmit it to the second light-emitting surface through the second recess.

[0024] As an implementable method, the optical module includes the dual-focus optical unit of the above-mentioned aspect, and the low-beam focusing unit is any one of a parabolic reflector, a quasi-parabolic reflector, an ellipsoidal reflector or a quasi-ellipsoidal reflector. The low-beam focusing unit can direct the light emitted by the light source to the dual-focus optical unit in a roughly parallel manner, and the first focus is set on the reflecting surface of the low-beam focusing unit.

[0025] According to another aspect of the embodiments of the present application, there is provided a vehicle lamp, comprising a plurality of the above-mentioned optical modules arranged in an arranged manner, wherein the dual-focus optical units of the plurality of optical modules are sequentially connected along a first direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0027] FIG1 is a schematic diagram of the structure of an optical module according to an embodiment of the present application;

[0028] FIG2 is a schematic diagram of the optical path of the optical module in FIG1 ;

[0029] FIG3 is a light profile diagram of the optical module in FIG1 ;

[0030] FIG4 is a second structural diagram of an optical module provided in an embodiment of the present application;

[0031] FIG5 is a schematic diagram of the optical path of the optical module in FIG4 ;

[0032] FIG6 is a third structural diagram of an optical module provided in an embodiment of the present application;

[0033] FIG7 is a schematic diagram of the optical path of the optical module in FIG6;

[0034] FIG8 is a fourth structural diagram of an optical module provided in an embodiment of the present application;

[0035] FIG9 is a schematic diagram of a light path of the optical module in FIG7 ;

[0036] FIG10 is a fifth structural diagram of an optical module provided in an embodiment of the present application;

[0037] FIG11 is a sixth structural diagram of an optical module provided in an embodiment of the present application.

[0038] FIG12 is a seventh structural diagram of an optical module provided in an embodiment of the present application;

[0039] FIG13 is a light profile diagram of the optical module in FIG12;

[0040] FIG14 is an eighth structural diagram of an optical module provided in an embodiment of the present application;

[0041] FIG15 is a ninth structural diagram of an optical module provided in an embodiment of the present application;

[0042] FIG16 is a tenth structural diagram of an optical module provided in an embodiment of the present application;

[0043] FIG17 is an eleventh structural diagram of an optical module provided in an embodiment of the present application;

[0044] FIG18 is a light profile diagram of the optical module in FIG17 ;

[0045] FIG19 is a twelfth structural diagram of an optical module provided in an embodiment of the present application;

[0046] FIG20 is a light profile diagram of the optical module in FIG19;

[0047] FIG21 is a thirteenth structural diagram of an optical module provided in an embodiment of the present application;

[0048] FIG22 is a schematic diagram of the optical path of the optical module in FIG21;

[0049] FIG23 is a light profile diagram of the optical module in FIG22;

[0050] FIG24 is a fourteenth structural diagram of an optical module provided in an embodiment of the present application;

[0051] FIG25 is a light profile diagram of the optical module in FIG24;

[0052] FIG26 is a fifteenth structural diagram of an optical module provided in an embodiment of the present application;

[0053] FIG27 is a schematic diagram of a structure of a light focusing unit according to an embodiment of the present application;

[0054] FIG28 is a second structural diagram of a light focusing unit provided in an embodiment of the present application;

[0055] FIG29 is a third structural diagram of a light focusing unit provided in an embodiment of the present application;

[0056] FIG30 is a fourth structural diagram of a light focusing unit provided in an embodiment of the present application;

[0057] FIG31 is a schematic diagram of the structure of a vehicle lamp provided in an embodiment of the present application;

[0058] FIG32 is a second structural diagram of a vehicle lamp provided in an embodiment of the present application;

[0059] FIG33 is a schematic diagram of the structure of another vehicle lamp provided in an embodiment of the present application;

[0060] FIG34 is a second structural diagram of another vehicle lamp provided in an embodiment of the present application;

[0061] FIG35 is a light pattern diagram of the vehicle light in FIG34;

[0062] FIG36 is a schematic diagram showing the relationship between the focal point and focal length of the dual-focus optical unit provided in an embodiment of the present application.

[0063] Icons: 10-optical module; 11-low beam focusing unit; 111-high beam focusing unit; 12-dual-focus optical unit; 121-first optical surface; 122-light output structure; 123-second optical surface; 124-high beam light input part; 128-one-way collimating surface; 140-first concave portion; 141-total reflection surface; 142-third optical surface, 150-second concave portion; 151-fourth optical surface; 152-bottom surface; 16-first optical element; 161-first one-way collimating surface; 17-second optical element; 171-second one-way collimating surface; 19-light shielding plate; 20-light source. DETAILED DESCRIPTION

[0064] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0065] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0066] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0067] On the one hand, an embodiment of the present application provides a dual-focus optical unit 12, as shown in Figures 1, 2, and 36, including a first optical surface 121 and a light-emitting structure 122 arranged in sequence along the light path transmission direction, and also including a first focus and a second focus arranged in sequence along the light path transmission direction, the first focus is located on the side of the first optical surface 121 away from the light-emitting structure 122, and the second focus is located between the first optical surface 121 and the light-emitting structure 122. In the opposite direction of the light path transmission direction, parallel light rays can be refracted by the light-emitting structure 122 and then converge to the second focus, and the light rays converged to the second focus can continue to be transmitted to the first optical surface 121, and can converge to the first focus after being refracted by the first optical surface 121.

[0068] In the dual-focus optical unit 12 in the embodiment of the present application, the light emitted from the first focus is incident on the first optical surface 121. Since the first optical surface 121 has the function of converging light, the light incident on the first optical surface 121 is converged at the second focus, continues to propagate to the light-emitting structure 122, and then is emitted in parallel.

[0069] As shown in FIG36 , the dual-focus optical unit 12 has a first focus F1 located on the side of the first optical surface 121 away from the light exit structure 122, and a second focus F2 located between the first optical surface 121 and the light exit structure 122. The distance between the first focus F1 and the first optical surface 121 is the first focal length f1, the distance between the second focus F2 and the first optical surface 121 is the second focal length f2, and the distance between the second focus F2 and the light exit structure 122 is the third focal length f3. By adjusting the first focal length f1, the second focal length f2, and the third focal length f3, the size of the light pattern on the light distribution screen can be adjusted, because the first optical surface 121 and the light exit structure 122 conform to the imaging law of a convex lens. When the light pattern increases, the maximum luminous flux value decreases, and when the light pattern decreases, the maximum luminous flux value increases. Specifically, the first focal length f1 and the second focal length f2 remain unchanged, the light distortion decreases when the third focal length f3 increases, and the light distortion increases when the third focal length f3 decreases; the first focal length f1 and the third focal length f3 remain unchanged, the light distortion decreases when the second focal length f2 increases, and the light distortion increases when the second focal length f2 decreases; the second focal length f2 and the third focal length f3 remain unchanged, the light distortion decreases when the first focal length f1 increases, and the light distortion increases when the first focal length f1 decreases.

[0070] According to the principle of light shape modulation by the dual-focus optical unit 12 , the first focal length f1 , the second focal length f2 and the third focal length f3 in the dual-focus optical unit 12 can be adjusted to achieve diversified configuration of light shapes.

[0071] Optionally, as shown in FIG1 , the bifocal optical unit 12 is a transparent integral part, the first focus is located outside the bifocal optical unit 12 , the second focus is located inside the bifocal optical unit 12 , and the light emitting structure 122 is the second optical surface 123 .

[0072] Furthermore, both the first optical surface 121 and the second optical surface 123 are convex surfaces protruding outward.

[0073] When the bifocal optical unit 12 is a transparent integral piece, its integrity and integration can be improved.

[0074] The first optical surface 121 protrudes outward to form a convex surface, which refracts the light incident thereon and converges it at a second focus. The second optical surface 123 protrudes outward to form a convex surface, and the focal points of the first optical surface 121 and the second optical surface 123 coincide with each other, so that the light converged by the first optical surface 121 continues to propagate and is emitted from the second light-emitting surface to form parallel light.

[0075] In one possible implementation of the embodiment of the present application, as shown in Figures 4, 5, and 6, the dual-focus optical unit 12 includes a plurality of first optical surfaces 121, a second optical surface 123, a plurality of first focal points, and a second focal point. The plurality of first optical surfaces 121 are connected in sequence, and the first optical surfaces 121 correspond to the first focal points one by one. In the direction opposite to the optical transmission direction, parallel light rays can be refracted by the second optical surfaces 123 and converged to the second focal points. The light rays converged to the second focal points can continue to be transmitted to each first optical surface 121, and can be refracted by each first optical surface 121 and converged to the corresponding first focal points. It should be noted that when the dual-focus optical unit 12 includes a plurality of first optical surfaces 121, the first focal points corresponding to each first optical surface 121 are located at different positions, and the second focal points corresponding to each first optical surface 121 are located at the same position, that is, the dual-focus optical unit 12 includes a second focal point, so that the light rays incident from the plurality of first optical surfaces 121 converge at the same position and are emitted from the second optical surface 123.

[0076] According to the requirements of light shape, the focal length of each first optical surface 121 can be modulated separately to achieve diversified configuration of light shape.

[0077] Optionally, as shown in FIG4 , a plurality of first optical surfaces 121 are arranged along a first direction (such as the AA direction in FIG4 ), and all of the first optical surfaces 121 are curved surfaces, and the first direction is perpendicular to the light propagation direction.

[0078] Multiple first optical surfaces 121 are arranged along a first direction. Specifically, when the dual-focus optical unit 12 is applied to a vehicle lamp, the first direction is a horizontal direction, and the dual-focus optical unit 12 can be used to form a main low-beam light shape or an auxiliary low-beam light shape. Specifically, as shown in Figure 4, when the low-beam focusing unit 11 corresponding to the multiple first optical surfaces 121 has a horizontal light-and-dark cut-off line structure, the light shape formed by the light emitted through the dual-focus optical unit 12 is an auxiliary low-beam light shape; when the low-beam focusing unit 11 corresponding to the multiple first optical surfaces 121 has a light-and-dark cut-off line structure with an inflection point, the light shape formed by the light emitted through the dual-focus optical unit 12 is a main low-beam light shape; when a part of the low-beam focusing unit 11 corresponding to the multiple first optical surfaces 121 has a horizontal light-and-dark cut-off line structure and a part of the light has a light-and-dark cut-off line structure with an inflection point, the light shape formed by the light emitted through the dual-focus optical unit 12 is a superimposed light shape of the main low-beam light shape and the auxiliary low-beam light shape.

[0079] In addition, as shown in FIG6 , a plurality of first optical surfaces 121 correspond to focusing units arranged up and down, wherein the light source 20 corresponding to one focusing unit is a low beam light source 20, and the light source 20 corresponding to the other focusing unit is a high beam light source 20. The dual-focus optical unit 12 can realize the integration of high and low beams, improve the integration of the car light module, and save space inside the car light when used in the car light.

[0080] In one feasible manner of the embodiment of the present application, as shown in Figures 8 and 9, a first recess 140 is formed at the lower portion of the dual-focus optical unit 12, and the first recess 140 has a total reflection surface 141 and a third optical surface 142. A light-dark cutoff line structure is formed at the intersection of the total reflection surface 141 and the third optical surface 142. The second focus is located on or near the light-dark cutoff line structure. The total reflection surface 141 is connected to the first optical surface 121. Part of the light incident from the first optical surface 121 can hit the total reflection surface 141 and be totally reflected to the second optical surface 123.

[0081] Providing a cutoff structure in the first recess 140 of the bifocal optical unit 12 results in a higher light efficiency than providing a cutoff structure on the focusing unit. Light enters the bifocal optical unit 12 via the first optical surface 121. Some of the light is directly emitted from the second optical surface 123, while some is reflected from the total reflection surface 141 to the second optical surface 123. The total reflection surface 141 reflects light originally directed toward the bottom of the bifocal optical unit 12 toward the second optical surface 123. Providing a cutoff structure at the boundary of the focusing unit results in the loss of some of the light directed toward the focusing unit. Therefore, this embodiment provides a higher light efficiency.

[0082] When the bifocal optical unit 12 is used in a vehicle lamp, the second direction is the vertical direction. As shown in Figures 8 and 9, when light is incident from the first optical surface 121, it is refracted by the first optical surface 121, enters the bifocal optical unit 12, converges, and then continues to propagate to exit from the second optical surface 123. When light is incident from the third optical surface 142, the light propagates to exit from the second optical surface 123.

[0083] As shown in FIG12 , when the focusing units include multiple light-gathering units and are arranged up and down, the upper focusing unit corresponds to the low beam light source 20 and the first optical surface 121, and the lower focusing unit corresponds to the high beam light source 20 and the third optical surface 142. The dual-focus optical unit 12 realizes the integration of high and low beams, thereby improving the integration of the vehicle light module. Specifically, the superimposed light shape of the high and low beams after integration is shown in FIG13 .

[0084] It should be noted that, since the third optical surface 142 may be a plane, it does not have the function of converging light, and the corresponding focusing unit needs to be configured to have the function of converging light.

[0085] In one feasible manner of an embodiment of the present application, as shown in FIG11 , a high beam light incident portion 124 is connected below the first optical surface 121 , a light incident surface of the high beam light incident portion 124 is connected to the first optical surface 121 , and a light emitting surface of the high beam light incident portion 124 is connected to the total reflection surface 141 and is arranged opposite to the third optical surface 142 .

[0086] Specifically, when light is incident from the first optical surface 121, it is refracted by the first optical surface 121, enters the bifocal optical unit 12 and converges, then continues to propagate to the second optical surface 123 and exits. When light is incident from the light incident surface of the high-beam light incident portion 124, it is refracted by the light incident surface of the high-beam light incident portion 124, enters the high-beam light incident portion 124, exits from the light exit surface of the high-beam light incident portion 124, enters the bifocal optical unit 12 through the third optical surface 142, propagates to the second optical surface 123, and exits.

[0087] When the dual-focus optical unit 12 is applied to a vehicle lamp, when the focusing units include multiple and are arranged up and down, the upper focusing unit corresponds to the low beam light source 20 and the first optical surface 121, and the lower focusing unit corresponds to the high beam light source 20 and the light incident surface of the high beam light incident part 124. The dual-focus optical unit 12 realizes the integration of high and low beams, thereby improving the integration of the vehicle lamp module.

[0088] In one possible implementation of the present invention, as shown in FIG10 , a second recess 150 is formed on the upper portion of the dual-focus optical unit 12. The second recess 150 has a fourth optical surface 151 and a bottom surface 152. A cutoff structure is formed at the intersection of the fourth optical surface 151 and the bottom surface 152. The second focus is located on or near the cutoff structure. Some light enters the dual-focus optical unit 12 through the fourth optical surface 151 and directly strikes the second optical surface 123 before exiting. Some light is refracted through the bottom surface 152 and exits the dual-focus optical unit 12, thereby forming a light-shaped cutoff line. However, compared to the embodiment shown in FIG9 , some light is lost due to the refraction of some light out of the dual-focus optical unit 12, resulting in lower light efficiency.

[0089] Correspondingly, when the focusing units include multiple ones and are arranged up and down, the upper focusing unit corresponds to the low beam light source 20 and the fourth optical surface 151, and the lower focusing unit corresponds to the high beam light source 20 and the first optical surface 121. The dual-focus optical unit 12 realizes the integration of high and low beams, thereby improving the integration of the car light module.

[0090] It should be noted that, since the fourth optical surface 151 may be a plane, it does not have the function of converging light, and the corresponding focusing unit needs to be configured to have the function of converging light.

[0091] Optionally, as shown in FIG. 14 , FIG. 15 and FIG. 16 , the third optical surface 142 is a cylindrical surface or a quasi-cylindrical surface.

[0092] Specifically, the third optical surface 142 is configured as a cylindrical or quasi-cylindrical surface to achieve unidirectional collimation of light. For example, as shown in FIG15 , the third optical surface 142 is a cylindrical or quasi-cylindrical surface formed by stretching a curve in the vertical direction, which has the effect of collimating light in the horizontal direction. Correspondingly, the second optical surface 123 can be configured as a cylindrical or quasi-cylindrical surface formed by stretching a curve in the horizontal direction, which has the effect of collimating light in the vertical direction. Furthermore, the light cutoff line structure of the dual-focus optical unit 12 in FIG14 is a horizontal light cutoff line structure. Light projected through this dual-focus optical unit produces a light pattern with a horizontal light cutoff line, which can be used to assist in scenes such as low beam, bending, and fog lighting.

[0093] Optionally, as shown in FIG16 , the dual-focus optical unit 12 includes a plurality of first optical surfaces 121 arranged along a first direction, a second optical surface 123, a plurality of first focal points, and a second focal point. The plurality of first optical surfaces 121 are connected in sequence, and the first optical surfaces 121 correspond one-to-one with the first focal points. In the direction opposite to the direction of light transmission, parallel light rays can be refracted by the second optical surfaces 123 and converged to the second focal points. Light rays converged to the second focal points can continue to be transmitted to each first optical surface 121 and refracted by each first optical surface 121 to converge to the corresponding first focal point. A light-dark cutoff line structure is formed at the intersection of the total reflection surface 141 and the third optical surface 142 of the dual-focus optical unit 12, and the second focal point is located on or near the light-dark cutoff line structure.

[0094] The light propagation path is shown in Figure 7. Part of the light enters the dual-focus optical unit 12 through each first optical surface 121, where it converges and then continues to propagate to the second optical surface 123 for exit. For example, when multiple focusing units are arranged vertically, the upper focusing unit corresponds to the low-beam light source 20 and the first optical surface 121, while the lower focusing unit corresponds to the high-beam light source 20 and the third optical surface 142. The dual-focus optical unit 12 thus achieves integrated low and high beams. Part of the light emitted by the low-beam light source 20 is incident on the first optical surface 121 and directly exits the second optical surface 123. Part of the light emitted by the low-beam light source 20 is incident on the first optical surface 121 and then reflected by the total reflection surface 141 to exit the second optical surface 123. Light emitted by the high-beam light source 20 is incident on the third optical surface 142 and then propagates to the second optical surface 123 for exit. The third optical surface 142 can be configured as a cylindrical or quasi-cylindrical surface to achieve unidirectional collimation of the light.

[0095] In one possible implementation of the embodiment of the present application, as shown in FIG. 17 , the second optical surface 123 includes at least one unidirectional collimating surface 128 .

[0096] When the second optical surface 123 includes a unidirectional collimating surface 128, the unidirectional collimating surface 128 collimates and converges light in one direction to form an auxiliary low beam light shape, as shown in FIG18 , so that the left and right widening of the low beam meets the requirements and is superimposed with the main low beam light shape to form a complete low beam light shape.

[0097] In one implementable manner of an embodiment of the present application, the dual-focus optical unit 12 includes a first optical element 16 and a second optical element 17, and the first optical element 16 is provided with a first optical surface 121 and a first one-way collimating surface 161 in sequence along the light path transmission direction, and the second optical element 17 is provided with a second optical element 17 light incident surface and a second one-way collimating surface 171 in the light path transmission direction. The first one-way collimating surface 161, the light incident surface of the second optical element 17 and the second one-way collimating surface 171 together constitute a light output structure 122, and parallel light can be refracted through the second one-way collimating surface 171, the light incident surface of the second optical element 17 and the first one-way collimating surface 161 in sequence and then converged to the second focus. The light converged to the second focus can continue to be transmitted to the first optical surface 121, and can converge to the first focus after being refracted through the first optical surface 121.

[0098] Optionally, as shown in Figure 19, the collimation directions of the first one-way collimating surface 161 and the second one-way collimating surface 171 can be perpendicular to each other, so as to realize collimation and convergence of the outgoing light in two directions. In the embodiment of the present application, the first one-way collimating surface 161 realizes collimation of the light in the horizontal direction, and the second one-way collimating surface 171 realizes collimation of the light in the vertical direction. The focus of the first one-way collimating surface 161 and the second one-way collimating surface 171 is located at the second focus of the dual-focus optical unit 12. Since the focal length of the second one-way collimating surface 171 becomes larger, the light shape is a light shape pattern with a narrower vertical direction as shown in Figure 20.

[0099] In one feasible manner of an embodiment of the present application, as shown in Figures 21 and 22, the dual-focus optical unit 12 includes a first optical surface 121, multiple second optical surfaces 123, a first focus and a second focus. The multiple second optical surfaces 123 are connected in sequence. Along the opposite direction of the light path transmission direction, parallel light rays can be refracted by each second optical surface 123 and then converge to the second focus. The light rays converged to the second focus can continue to be transmitted to the first optical surface 121, and can converge to the first focus after being refracted by the first optical surface 121.

[0100] It should be noted that when the dual-focus optical unit 12 includes multiple second optical surfaces 123, the second focus corresponding to each second optical surface 123 is located at the same position, that is, the dual-focus optical unit 12 includes one second focus, so that the light incident from the first optical surface 121 converges at the same position and is emitted from the multiple second optical surfaces 123 respectively.

[0101] According to the requirements of light shape, the focal length of each second optical surface 123 can be modulated separately to achieve diversified configuration of light shape.

[0102] When the dual-focus optical unit 12 includes multiple second optical surfaces 123, the path of the light is as shown in Figure 22. The light is incident on the first optical surface 121, and after converging at the second focus, it is emitted to different second optical surfaces 123 respectively, and parallel light is emitted through the second optical surfaces 123 respectively, so that the light passing through the dual-focus optical unit 12 forms multiple light shapes with a certain angle offset, as shown in Figure 23, which can be used to assist low beam scenes.

[0103] Optionally, as shown in FIG24 , the dual-focus optical unit 12 includes a plurality of second optical surfaces 123 arranged along a first direction, a first optical surface 121, a first focus, and a second focus. The plurality of second optical surfaces 123 are connected in sequence, and the first optical surfaces 121 correspond one-to-one to the first focus. In the direction opposite to the direction of light transmission, parallel light rays can be refracted by each second optical surface 123 and converged to the second focus. Light rays converging to the second focus can continue to propagate to each first optical surface 121 and, after being refracted by the first optical surface 121, converge to the corresponding first focus. A light-dark cutoff structure is formed at the intersection of the total reflection surface 141 and the third optical surface 142 of the dual-focus optical unit 12, and the second focus is located on or near the light-dark cutoff structure.

[0104] For example, when there are multiple focusing units arranged in an upper and lower arrangement, the upper focusing unit is provided with the low-beam light source 20 and the first optical surface 121, and the lower focusing unit is provided with the high-beam light source 20 and the third optical surface 142. Thus, the dual-focus optical unit 12 realizes integrated low and high beams. Some light emitted by the low-beam light source 20 is incident on the first optical surface 121 and then directly emitted from the second optical surface 123. Some light is incident on the first optical surface 121 and then reflected by the total reflection surface 141 to the second optical surface 123 before being emitted. Light emitted by the high-beam light source 20 is incident on the third optical surface 142 and then propagates to the second optical surface 123 before being emitted. The third optical surface 142 can be configured as a cylindrical or quasi-cylindrical surface to achieve unidirectional collimation of the light.

[0105] In one possible implementation of the embodiment of the present application, as shown in FIG26 , a cutoff structure is formed on the upper surface of the dual-focus optical unit 12, the second focus is located on or near the cutoff structure, and the second optical surface 123 is located below the optical axis of the first optical surface 121. Specifically, light strikes the first optical surface 121 above the optical axis of the dual-focus optical unit 12 and passes through the second optical surface 123 below the optical axis. From the perspective of the optical path, only half of the first optical surface 121 and half of the second optical surface 123 are used, thereby making the second optical surface 123 smaller.

[0106] On the other hand, an embodiment of the present application provides an optical module 10, including any of the above-mentioned dual-focus optical units 12, and also including a light source 20 and a low-beam focusing unit 11 arranged on the light-emitting side of the light source 20, and the dual-focus optical unit 12 is arranged in the light-emitting direction of the low-beam focusing unit 11.

[0107] Optionally, as shown in Figures 1, 2 and 4, the low beam focusing unit 11 is any one of a parabolic reflector, a quasi-parabolic reflector, an ellipsoidal reflector or a quasi-ellipsoidal reflector; or, the low beam focusing unit 11 is a light guide having a parabolic reflecting surface, a quasi-parabolic reflecting surface, an ellipsoidal reflecting surface or a quasi-ellipsoidal reflecting surface; the low beam focusing unit 11 can direct the light emitted by the light source 20 to the dual-focus optical unit 12 in approximately parallel fashion, with the first focus being set at or near the boundary of the low beam focusing unit 11 close to the light source 20, and a light-dark cutoff line structure is provided at the boundary of the low beam focusing unit 11 close to the light source 20.

[0108] Specifically, the low-beam focusing unit 11 needs to converge the divergent light emitted by the light source 20 and convert it into approximately parallel light rays that are directed to the bifocal optical unit 12. Therefore, the low-beam focusing unit 11 can be any of a parabolic reflector, a quasi-parabolic reflector, an ellipsoidal reflector, or a quasi-ellipsoidal reflector; alternatively, the low-beam focusing unit 11 can be a light guide having a parabolic reflective surface, a quasi-parabolic reflective surface, an ellipsoidal reflective surface, or a quasi-ellipsoidal reflective surface; or it can be an optical element that has a converging effect on light, such as a focusing cup or convex lens as shown in Figures 29 and 30. The specific form is not limited here. The cutoff line structure provided at the boundary of the low-beam focusing unit 11 near the light source 20 can be achieved by directly cutting the cutoff line structure into the low-beam focusing unit 11, or it can be achieved by other elements, such as adding a light shielding plate 19 as shown in Figures 27 and 28 to achieve the cutoff line. The specific form is also not limited here.

[0109] Optionally, as shown in Figures 10, 14, and 16, the low beam focusing unit 11 is an ellipsoidal reflector or a quasi-ellipsoidal reflector, and the low beam focusing unit 11 can focus the light emitted by the light source 20 to the second focus, and the light source 20 is set at the first focus or near the first focus.

[0110] Optionally, as shown in Figures 10, 14 and 16, the low beam focusing unit 11 is any one of a parabolic reflector, a quasi-parabolic reflector, an ellipsoidal reflector or a quasi-ellipsoidal reflector. The low beam focusing unit 11 can direct the light emitted by the light source 20 to the dual-focus optical unit 12 in approximately parallel directions, and the first focus is set on the reflecting surface of the low beam focusing unit 11.

[0111] In one possible implementation of the embodiment of the present application, as shown in FIG12 , the optical module 10 further includes a high-beam focusing unit 111. The high-beam focusing unit 111 is an ellipsoidal reflector or a quasi-ellipsoidal reflector. The high-beam focusing unit 111 is capable of focusing light emitted by the light source 20 to a second focal point via the first recess 140. The light source 20 is disposed at the focal point of the high-beam focusing unit 111.

[0112] In one possible implementation of the present invention, as shown in FIG11 , the optical module 10 further includes a high-beam focusing unit 111. The high-beam focusing unit 111 is any one of a parabolic reflector, a quasi-parabolic reflector, an ellipsoidal reflector, or a quasi-ellipsoidal reflector. The high-beam focusing unit 111 is capable of directing light emitted by the light source 20 substantially parallel to the dual-focus optical unit 12, and sequentially transmitting the light to the second light-emitting surface through the high-beam light entrance portion 124 and the first recess 140. The light source 20 is disposed at the focal point of the high-beam focusing unit 111.

[0113] In one possible implementation of the embodiment of the present application, as shown in FIG32 , the optical module 10 further includes a high-beam focusing unit 111. The high-beam and low-beam units are any one of a parabolic reflector, a quasi-parabolic reflector, an ellipsoidal reflector, or a quasi-ellipsoidal reflector. The high-beam focusing unit 111 can direct the light emitted by the light source 20 substantially parallel to the dual-focus optical unit 12, and transmit the light to the second light-emitting surface through the second recess 150. The light source 20 is disposed at the focus of the high-beam focusing unit 111.

[0114] Another aspect of an embodiment of the present application provides a vehicle lamp, comprising a plurality of optical modules 10 arranged in an array, wherein the optical modules 10 are any of the above-mentioned optical modules 10 , and the dual-focus optical units 12 of the optical modules 10 are sequentially connected along a first direction.

[0115] As shown in FIG31 and FIG32 , the optical module 10 includes multiple optical modules 10 with a light / dark cutoff line structure. Light emitted by the high beam light source 20 and the low beam light source 20 enters the dual-focus optical unit 12 and then exits, realizing high and low beam integration.

[0116] As shown in Figures 33 and 34, an optical module 10 with a light-dark cutoff line structure and an optical module 10 without a light-dark cutoff line structure are included, wherein the optical module 10 without a light-dark cutoff line structure is located on both sides of the optical module 10 with a light-dark cutoff line structure, the optical module 10 without a light-dark cutoff line structure is correspondingly provided with a high beam light source 20, and the optical module 10 with a light-dark cutoff line structure is correspondingly provided with a high beam light source 20 and a low beam light source 20. The setting of high and low beams in the middle and high beams on both sides can optimize the connection between high and low beams, making the light shape at the connection more natural. The light shape diagram is shown in Figure 35. It can be seen from Figure 35 that the connection between high and low beams is relatively natural.

[0117] It should be noted that the above embodiments are merely examples of vehicle lights and are not exhaustive. Those skilled in the art can combine different optical modules 10 in different forms to form different vehicle lights according to actual conditions. Industrial Applicability

[0118] The dual-focus optical unit of the present application includes a first optical surface and a light-emitting structure arranged in sequence along the light transmission direction, and also includes a first focus and a second focus arranged in sequence along the light transmission direction, the first focus being located on the side of the first optical surface away from the second optical surface of the light-emitting structure, and the second focus being located between the first optical surface and the light-emitting structure. In the opposite direction of the light transmission direction, parallel light rays can be refracted by the light-emitting structure and converge to the second focus. The light rays converged to the second focus can continue to be transmitted to the first optical surface and refracted by the first optical surface to converge to the first focus. The first focus and the second focus have a total of three focal lengths corresponding to the first optical surface and the light-emitting structure, and diversified configuration of the light output shape can be achieved by adjusting each focal length.

Claims

1. A dual-focus optical unit, characterized in that: The optical path comprises a first optical surface and a light emitting structure which are sequentially arranged along the light transmission direction, and also comprises a first focus and a second focus which are sequentially arranged along the light transmission direction, wherein the first focus is located on a side of the first optical surface away from the light emitting structure, and the second focus is located between the first optical surface and the light emitting structure, and parallel light rays along the opposite direction of the light transmission direction can be refracted by the light emitting structure and converge to the second focus, and the light rays converged to the second focus can continue to be transmitted to the first optical surface and can converge to the first focus after being refracted by the first optical surface.

2. The dual focus optical unit according to claim 1, characterized in that: The dual-focus optical unit is a transparent integrated part, the first focus is located on the outside of the dual-focus optical unit, the second focus is located on the inside of the dual-focus optical unit, and the light-emitting structure is a second optical surface.

3. The dual focus optical unit according to claim 2, characterized in that: The first optical surface and the second optical surface are both convex surfaces protruding outward.

4. The dual focus optical unit according to claim 2, characterized in that: The dual-focus optical unit includes a plurality of first optical surfaces, one second optical surface, a plurality of first focal points and one second focal point. The plurality of first optical surfaces are connected in sequence. The first optical surfaces correspond to the first focal points one by one. In the direction opposite to the transmission direction of the optical path, parallel light rays can be refracted by the second optical surfaces and converge to the second focal points. The light rays converged to the second focal points can continue to be transmitted to each of the first optical surfaces and can converge to the corresponding first focal points after being refracted by each of the first optical surfaces.

5. The dual focus optical unit according to claim 2, characterized in that: The dual-focus optical unit includes one first optical surface, multiple second optical surfaces, one first focus and one second focus, and the multiple second optical surfaces are connected in sequence. Along the opposite direction of the light path transmission direction, parallel light can be refracted by each second optical surface and converge to the second focus. The light converged to the second focus can continue to be transmitted to the first optical surface and can converge to the first focus after being refracted by the first optical surface.

6. The dual focus optical unit according to claim 2, characterized in that: A first recess is formed at the bottom of the dual-focus optical unit, the first recess has a total reflection surface and a third optical surface, a light-dark cutoff line structure is formed at the intersection of the total reflection surface and the third optical surface, the second focus is located on or near the light-dark cutoff line structure, the total reflection surface is connected to the first optical surface, and part of the light incident from the first optical surface can hit the total reflection surface and be totally reflected to the second optical surface.

7. The dual focus optical unit according to claim 5, characterized in that: A high beam incident portion is connected below the first optical surface, a light incident surface of the high beam incident portion is connected to the first optical surface, a light emitting surface of the high beam incident portion is connected to the total reflection surface and is arranged opposite to the third optical surface.

8. The dual focus optical unit according to claim 2, characterized in that: A second recess is formed on the upper portion of the dual-focus optical unit, the second recess has a fourth optical surface and a bottom surface, a light-dark cutoff line structure is formed at the intersection of the fourth optical surface and the bottom surface, and the second focus is located on or near the light-dark cutoff line structure.

9. The dual focus optical unit according to claim 6, characterized in that: The third optical surface is a cylindrical surface or a quasi-cylindrical surface.

10. The dual focus optical unit according to claim 2, characterized in that: A cut-off line structure is formed on the upper surface of the dual-focus optical unit, the second focus is located on or near the cut-off line structure, and the second optical surface is located below the optical axis of the first optical surface.

11. The dual focus optical unit according to claim 1, characterized in that: The dual-focus optical unit includes a first optical element and a second optical element, wherein a first optical surface and a first one-way collimating surface are sequentially arranged on the first optical element along the light path transmission direction, and a second optical element light incident surface and a second one-way collimating surface are sequentially arranged on the second optical element along the light path transmission direction, and the first one-way collimating surface, the second optical element light incident surface and the second one-way collimating surface together constitute the light output structure, and parallel light can be converged to the second focus after being refracted by the second one-way collimating surface, the second optical element light incident surface and the first one-way collimating surface in sequence, and the light converged to the second focus can continue to be transmitted to the first optical surface, and can be converged to the first focus after being refracted by the first optical surface.

12. An optical module, characterized in that: It comprises the dual-focus optical unit described in any one of claims 1 to 11, and further comprises a light source and a low-beam focusing unit arranged on the light-emitting side of the light source, and the dual-focus optical unit is arranged in the light-emitting direction of the low-beam focusing unit.

13. The optical module according to claim 12, characterized in that: The optical module comprises the dual-focus optical unit according to any one of claims 1 to 5 or 11, the low-beam focusing unit is any one of a parabolic reflector, a quasi-parabolic reflector, an ellipsoidal reflector or a quasi-ellipsoidal reflector; or, the low-beam focusing unit is a light guide having a parabolic reflecting surface, a quasi-parabolic reflecting surface, an ellipsoidal reflecting surface or a quasi-ellipsoidal reflecting surface; The low beam focusing unit can direct the light emitted by the light source to the dual-focus optical unit in approximately parallel fashion, the first focus being arranged at or near a boundary of the low beam focusing unit close to the light source, and a light / dark cutoff line structure being arranged at a boundary of the low beam focusing unit close to the light source.

14. The optical module according to claim 12, characterized in that: The optical module includes the dual-focus optical unit described in claim 6, and also includes a high-beam focusing unit, which is an ellipsoidal reflector or a quasi-ellipsoidal reflector, and can focus the light emitted by the light source to the second focus through the first recess.

15. The optical module according to claim 12, characterized in that: The optical module includes the dual-focus optical unit described in claim 7, and also includes a high-beam focusing unit, which is any one of a parabolic reflector, a quasi-parabolic reflector, an ellipsoidal reflector or a quasi-ellipsoidal reflector, and the high-beam focusing unit can direct the light emitted by the light source to the dual-focus optical unit in a roughly parallel manner, and transmit it to the second light output surface through the high-beam light entrance portion and the first recess in sequence.

16. The optical module according to claim 12, characterized in that: The optical module includes the dual-focus optical unit described in claim 8 or 9, the low-beam focusing unit is an ellipsoidal reflector or a quasi-ellipsoidal reflector, the low-beam focusing unit can focus the light emitted by the light source to the second focus, and the light source is arranged at the first focus or near the first focus.

17. The optical module according to claim 16, characterized in that: The optical module also includes a high-beam focusing unit, which is any one of a parabolic reflector, a quasi-parabolic reflector, an ellipsoidal reflector or a quasi-ellipsoidal reflector. The high-beam focusing unit can direct the light emitted by the light source to the dual-focus optical unit in approximately parallel manner, and transmit it to the second light-emitting surface through the second recess.

18. The optical module according to claim 12, characterized in that: The optical module includes the dual-focus optical unit described in claim 10, and the low-beam focusing unit is any one of a parabolic reflector, a quasi-parabolic reflector, an ellipsoidal reflector or a quasi-ellipsoidal reflector. The low-beam focusing unit can direct the light emitted by the light source to the dual-focus optical unit in approximately parallel fashion, and the first focus is arranged on the reflecting surface of the low-beam focusing unit.

19. A vehicle lamp, characterized in that: It comprises a plurality of optical modules as described in any one of claims 12 to 18 arranged in an arranged manner, wherein the dual-focus optical units of the plurality of optical modules are sequentially connected along a first direction.

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