Reflective optical module, lighting device using the same, and vehicle

Abstract

The present invention discloses a reflective optical module, an illumination device and a vehicle using the same, comprising: a light source, and at least one first reflector, an optical lens and at least one second reflector arranged in sequence along the optical path direction; wherein the first reflector is arranged to be able to reflect the light emitted by the light source and make it enter the optical lens; the second reflector has a linear focus or an arc focus in the horizontal direction; the optical lens has a linear focus or an arc focus in the vertical direction; and the focal length of the second reflector is greater than the focal length of the optical lens; the light incident surface of the optical lens is a flat end surface or a curved surface; and the optical lens includes at least one light emitting surface; the light emitting surface is formed by sweeping the cross-section in the horizontal direction along the cross-section in the vertical plane or is formed by stretching the cross-section in the horizontal direction along the vertical direction. The present invention can take into account both the flattening of the light pattern and the imaging effect of the cut-off line between light and darkness.

Description

Technical Field

[0001] The present invention relates to the technical field of lighting devices, and in particular to a reflective optical module and a lighting device and a vehicle using the same. Background Art

[0002] As the development of the automobile industry gradually matures and stabilizes, the shape of car lights is becoming more and more diverse. The high and low beam modules are no longer the traditional semi-spherical type, and the appearance is becoming more and more slender. Flattening has become one of the main trends in the design of automobile lights. For flattened automobile lights, the corresponding lighting characteristics are small up and down lighting angles and large left and right lighting angles. Specifically, the size of the light-emitting surface of the lens is limited, and the size of the lens in the up and down direction is less than or equal to 20mm, and the size in the left and right direction is 40mm to 120mm. However, since the light-emitting surface size of the lens of the prior art is relatively large, if the lens is directly reduced or combined with the reduction of optical elements, it cannot meet the requirements of light shape, optical performance and optical efficiency.

[0003] In this regard, the patent with announcement number CN 215372307 U discloses a lighting module, a lighting device and a vehicle, which can independently adjust the surface shape of the two optical surfaces of the light-incoming surface and the light-outgoing part, simplify the dimming steps in the light distribution process, and effectively reduce the upper and lower dimensions of the optical lens under the premise of ensuring the same light effect. However, it adopts a dual-focal length lens. For the light-outgoing part or the outer lens of the lens, there can only be one focal length, and the deflection angle of the lens and the optical axis direction has a greater impact on the optical design, so the corresponding design difficulty is also great. In addition, the near-bright and dark cut-off lines in the lighting device are formed by refraction of a component with a cut-off line shape in conjunction with a lens, so the number of components used is large, and the overall structure is relatively complex, and the cut-off line obtained by lens imaging, because the light-outgoing surface of the lens has a certain curvature, then the light will definitely have a prism effect after passing through the lens, and different degrees of color segregation will occur, that is, the color of the dark cut-off line still has the problem of easy coloring. Therefore, for the lighting device used in the prior art, on the basis of realizing the flattening of the light type, it is also necessary to take into account the optimization of the imaging effect of the light and dark cut-off lines. Summary of the invention

[0004] The first object of the present invention is to provide a reflective optical module to solve the technical problem of taking into account both the flattening of the light pattern and the imaging effect of the light and dark cutoff lines.

[0005] The second object of the present invention is to provide an illumination device to solve the technical problem of taking into account both the flattening of the light pattern and the imaging effect of the light and dark cut-off line.

[0006] The third object of the present invention is to provide a vehicle to solve the technical problem of making the lighting device on the vehicle take into account both the flattening of the light pattern and the imaging effect of the light and dark cut-off line.

[0007] The reflective optical module of the present invention is implemented as follows:

[0008] A reflective optical module includes: a light source and at least one first reflector, an optical lens, and at least one second reflector arranged in sequence along the optical path direction; wherein

[0009] The first reflector is arranged to be able to reflect the light emitted by the light source and make it enter the optical lens;

[0010] The second reflector has a linear focus or an arc focus in the horizontal direction; the optical lens has a linear focus or an arc focus in the vertical direction; and the focal length of the second reflector is greater than the focal length of the optical lens;

[0011] The incident surface of the optical lens is a flat end face or a curved surface; and the optical lens includes at least one light-emitting surface; the light-emitting surface is formed by sweeping the cross-section in the horizontal direction along the cross-section in the vertical plane or is a surface formed by stretching the cross-section in the horizontal direction along the vertical direction.

[0012] In an alternative embodiment of the present invention, the focal line of the second reflector and the focal line of the optical lens together form the focal region of the reflective optical module.

[0013] In an alternative embodiment of the present invention, the first reflector is a free-form surface reflector or a parabolic reflector; and

[0014] The focal length of the first reflector is less than or equal to 3 mm.

[0015] In an alternative embodiment of the present invention, the cross-section of the optical lens in the horizontal direction is a plano-convex curve or a convex-plano curve; and

[0016] The cross-section of the optical lens in the vertical direction is a plano-convex curve or a plano-concave curve

[0017] In an alternative embodiment of the present invention, the optical lens includes at least two light-emitting surfaces; and

[0018] The arc foci of at least two of the light-emitting surfaces are the same or not exactly the same.

[0019] In an alternative embodiment of the present invention, the second reflector is formed by stretching a parabola with a focus in the focal region of the reflective optical module along the horizontal direction.

[0020] In an alternative embodiment of the present invention, the reflecting surface of the second reflector is adapted to form the side wall of a bathtub-shaped cut-off line of light and dark; and

[0021] The optical lens is adapted to form the bottom wall of the cut-off line of light and dark extending in the horizontal direction.

[0022] In an alternative embodiment of the present invention, the light source, at least one first mirror, the optical lens, and at least one second mirror are arranged and distributed in a direction perpendicular to the optical axis.

[0023] In an alternative embodiment of the present invention, the light source, at least one first mirror, the optical lens, and at least one second mirror are rotationally arranged around a direction perpendicular to the optical axis; and

[0024] A plane mirror is further provided between the optical lens and at least one second mirror.

[0025] The lighting device of the present invention is implemented as follows:

[0026] A lighting device, comprising: the reflective optical module.

[0027] The vehicle of the present invention is implemented as follows:

[0028] A vehicle, comprising: the lighting device.

[0029] By adopting the above technical solution, the present invention has the following beneficial effects: In the reflective optical module of the present invention, the lighting device and the vehicle using the same, the second mirror has a linear focus or an arc focus in the horizontal direction; and the optical lens has a linear focus or an arc focus in the vertical direction; and the focal length of the second mirror is greater than the focal length of the optical lens. With such a structure, on the one hand, since the focal length of the second mirror is greater than the focal length of the optical lens, the light source can form a rectangular lighting pattern through the second mirror, without the need for special design of an additional reflective optical module, making the headlight lighting system simple in structure. For example, it is allowed that the size of the reflective optical module in the up and down direction is less than or equal to 15 mm, thus meeting the requirements of a headlight with a flattened shape.

[0030] In addition, the reflecting surface of the second mirror is suitable for forming the side wall of a bathtub-shaped cut-off line, and its color is close to white without the phenomenon of color bleeding.

[0031] Furthermore, the present invention can achieve different focal lengths in the horizontal direction through the cooperation of multiple second mirrors, so as to achieve different up and down widths. And the different spatial arrangement structures of multiple second mirrors are more beneficial to the conformal shaping of the overall reflective optical module. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic structural diagram of the reflective optical module of the present invention;

[0033] Figure 2Schematic diagram of the light source, first reflector, optical lens, and second reflector of the reflective optical module of the present invention arranged and distributed in a direction perpendicular to the optical axis;

[0034] Figure 3 Schematic diagram of the light source, first reflector, optical lens, and second reflector of the reflective optical module of the present invention arranged and distributed by rotating around a direction perpendicular to the optical axis;

[0035] Figure 4 Schematic diagram of the parabola c and the second reflector of the reflective optical module of the present invention;

[0036] Figure 5 Schematic diagram of the vertically single-direction collimated lens 2' and the traditional plano-convex lens 2";

[0037] Figure 6 Schematic diagram of the horizontal cross-section a of the lens 2';

[0038] Figure 7 Schematic diagram of the vertical cross-section b of the lens 2";

[0039] Figure 8 Optical effect diagram of the reflective optical module of the present invention.

[0040] In the figure: light source 1, first reflector 3, optical lens 2, incident light surface 21, outgoing light surface 22, vertically single-direction collimated lens 2', traditional plano-convex lens 2", horizontal cross-section a of the lens 2', vertical cross-section b of the lens 2", parabola c, second reflector 4, plane reflector 5. Detailed implementation mode

[0041] In order to make the content of the present invention easier to be clearly understood, the following further detailed description of the present invention is given according to specific embodiments in conjunction with the accompanying drawings.

[0042] Embodiment 1:

[0043] Please refer to Figures 1 to 8 As shown, this embodiment provides a reflective optical module, including: a light source 1 and at least one first reflector 3, an optical lens 2, and at least one second reflector 4 arranged in sequence along the optical path direction; wherein the first reflector 3 is arranged to be able to reflect the light emitted by the light source 1 and make it enter the optical lens 2; the second reflector 4 has a focus in the horizontal direction; the optical lens 2 has a linear focus or an arc focus in the vertical direction; the focal line of the second reflector 4 and the focal line of the optical lens 2 jointly form the focal region of the reflective optical module.

[0044] It should be noted here that the "horizontal direction" and "vertical direction" defined in this embodiment are both defined in combination with the orientation of the reflective optical module during actual use.

[0045] In this embodiment, different focal lengths in the horizontal direction can be achieved through the cooperation of multiple second reflectors 4, so as to achieve different upper and lower widths. Moreover, the different spatial arrangement structures of the multiple second reflectors 4 are more beneficial to the conformal shaping of the overall reflective optical module.

[0046] The focus of the second reflector 4 in this embodiment can be a linear focus, and its formation method is as follows: The second reflector 4 is formed by stretching a parabola with the focus located in the focal area of the reflective optical module along the horizontal direction. The linear focus is a straight line located in the focal area of the reflective optical module.

[0047] The focus of the second reflector 4 in this embodiment can be an arc focus, and its formation method is as follows: The second reflector 4 is formed by sweeping a parabola with the focus located in the focal area of the reflective optical module along a curve in the horizontal plane. The arc focus is a line located in the focal area of the reflective optical module and parallel to the sweeping curve.

[0048] In a preferred case, the focal length of the first reflector 3 is less than or equal to 3 mm. In this way, in order to achieve the same illuminance value, the focal length of the entire reflective optical module can be larger, but at the same time, the distance of the reflective optical module in the optical axis direction can be shortened by at least 30% compared with the traditional solution.

[0049] In an alternative embodiment, the focal length of the second reflector 4 is 3 to 5 times the focal length of the optical lens 2, which can produce a light pattern that is wider on the left and right and narrower on the top and bottom. The light pattern imaged on the road surface can illuminate wider, and the light source 1 can form a rectangular illumination light pattern through the second reflector 4 without special design of an additional reflective optical module, making the structure of the vehicle headlight illumination system simple. For example, it is allowed that the size of the reflective optical module in the up and down direction is less than or equal to 15 mm, so as to meet the requirements of a vehicle headlight with a flattened shape.

[0050] The incident surface 21 of the optical lens 2 is a flat end face or a curved surface; and the optical lens 2 includes at least one light-emitting surface 22; the light-emitting surface 22 is formed by sweeping the cross-section in the horizontal direction along the cross-section in the vertical plane or by stretching the cross-section in the horizontal direction along the vertical direction. When each light-emitting surface 22 is formed by sweeping, the lower boundary of the imaged light pattern has a smoother transition.

[0051] The arc focus of each light-emitting surface 22 of the optical lens 2 in this embodiment is formed as follows: a traditional plano-convex lens or a lens 2' with horizontal single-direction collimation, the focus of the lens 2' is set at the focus of the reflective optical module; another traditional plano-convex lens 2" also has its focus set at the focus of the reflective optical module; the lens 2' and the lens 2" are placed in close proximity. The lens 2' has a cross-section line a in the horizontal plane, and the lens 2" has a cross-section line b in the vertical plane. The arc focus of the inner lens 2 in the reflective optical module is a curve parallel to the cross-section line b and located at the focus of the reflective optical module. That is, the light-emitting surface 22 of the inner lens 2 is formed by sweeping the cross-section line a along the cross-section line b, and the light-emitting surface 22 and the light-incident surface 21 together form the optical lens 2.

[0052] The first reflector 3 is a free-form reflector or a parabolic reflector; and the focal length of the first reflector 3 is less than or equal to 3 mm. Among them, when the first reflector 3 is a free-form reflector, a free-form reflector is used. The so-called free form means that the surface shape can be any spatial surface, integrating light distribution and reflection, which can make the angle of the light reflected by the light source 1 after passing through the first reflector 3 larger, and thus make the light pattern after imaging wider; moreover, the free-form reflector is composed of free-form surfaces with multiple curvatures. By using the free-form reflector as the first reflector 3, the direction of the reflected light changes continuously with the shape of the free-form reflector surface, and the light can be projected onto a specified area. Using the free-form reflector not only has a simple manufacturing process, but also can allow more light to enter the lens, improving the efficiency of the overall reflective optical module.

[0053] The cross-section of the optical lens 2 in the horizontal direction is a plano-convex curve or a convex-plano curve; and the cross-section of the optical lens 2 in the vertical direction is a plano-convex curve or a plano-concave curve. The optical lens 2 includes at least two light-emitting surfaces 22; and the arc foci of the at least two light-emitting surfaces 22 are the same or not exactly the same. That is, it can be just two light-emitting surfaces 22, or more than two light-emitting surfaces 22. The above situations all meet the usage requirements of this embodiment. The drawings in this embodiment are only examples of the case of multiple light-emitting surfaces 22.

[0054] Taking an optional case as an example with reference to the accompanying drawings, the cross-section of the light-emitting surface 22 in the horizontal direction is a forwardly convex curve (the forwardly convex curve here specifically refers to being convex towards the second reflector 4), and the cross-section of the light-emitting surface 22 in the vertical direction is also a curve, which can be a convex curve or a concave curve (the convex curve here specifically refers to being convex towards the second reflector 4, while the concave curve refers to the surface towards the second reflector 4 being concave). This embodiment does not make an absolute limitation on this. In this regard, it should be noted that when the light-incident part includes more than two light-emitting surfaces 22, that is, multiple light-emitting surfaces 22, there are the following four cases: First, the cross-sections of the multiple light-emitting surfaces 22 in the vertical direction are all convex curves, which has a converging effect, has a relatively large degree of deflection of light, and can have a certain collimating effect on divergent light; and the convexity rates of the convex curves corresponding to the cross-sections of the multiple light-emitting surfaces 22 in the vertical direction are all the same; Second, the cross-sections of the multiple light-emitting surfaces 22 in the vertical direction are all convex curves, which has a converging effect, has a relatively large degree of deflection of light, and can have a certain collimating effect on divergent light, but the convexity rates of the convex curves corresponding to the cross-sections of the multiple light-emitting surfaces 22 in the vertical direction are not all the same; Third, the cross-sections of the multiple light-emitting surfaces 22 in the vertical direction are all concave curves, and the depression rates of the concave curves corresponding to the cross-sections of the multiple light-emitting surfaces 22 in the vertical direction are all the same; Fourth, the cross-sections of the multiple light-emitting surfaces 22 in the vertical direction are all concave curves, and the depression rates of the concave curves corresponding to the cross-sections of the multiple light-emitting surfaces 22 in the vertical direction are not all the same. The above-mentioned situations all meet the usage requirements of this embodiment. This embodiment does not make an absolute limitation on which specific situation to adopt. The accompanying drawings of this embodiment only take the case where the horizontal cross-section and the vertical cross-section of the light-emitting surface 22 of the optical lens 2 are both plano-convex curves along the optical axis direction as an example, and the plano-convex curve here is specifically convex towards the vehicle driving direction.

[0055] Furthermore, regarding the relationship between the first reflector 3 and the light-emitting surface 22, in an optional implementation case, the first reflector 3 and the light-emitting surface 22 are distributed in a one-to-one correspondence; in another optional implementation case, at least one light-emitting surface 22 corresponds to more than one first reflector 3. In this case, that is to say, for multiple light-emitting surfaces 22, it can be that each light-emitting surface 22 corresponds to more than one, for example but not limited to two, first reflectors 3, or it can be that only some of the multiple light-emitting surfaces 22 correspond to more than one, for example but not limited to two, first reflectors 3. The above situations all meet the usage requirements of this embodiment. In this regard, this embodiment does not make an absolute limitation.

[0056] The light source 1 and the first reflector 3 are arranged in a one-to-one correspondence, and the light source 1 is arranged in the focal region corresponding to the first reflector 3. The focal region is the region near the focal point including the focal point. Specifically, the light-emitting center of the light source 1 can be arranged at the focal point of the first reflector 3.

[0057] It should be noted that the second reflector 4 in this embodiment is formed by stretching a parabola c with its focus in the focal region of the reflective optical module along the horizontal direction. The reflecting surface of the second reflector 4 is adapted to form the side wall of the bathtub-shaped cut-off line, and its color is close to white without color blooming; and the optical lens 2 is adapted to form the bottom wall of the cut-off line extending in the horizontal direction.

[0058] In an alternative embodiment, the light source 1, at least one first reflector 3, the optical lens 2, and at least one second reflector 4 are arranged and distributed in a direction perpendicular to the optical axis. The overall size of the reflective optical module in this arrangement is reduced by at least 40% compared to the size of the optical module formed by arranging optical elements along the optical axis. Therefore, based on this structure, the occupied space of the overall reflective optical module in the vehicle headlight environment along the optical axis direction can be reduced. In addition, since the light rays reflected by the second reflector 4 have a small deflection angle in the up and down directions, it is very suitable for the flattened vehicle headlight shape. The size in the up and down directions can be designed to be ≤ 15 mm, and a high optical efficiency can be ensured.

[0059] In another alternative embodiment, the light source 1, at least one first reflector 3, the optical lens 2, and at least one second reflector 4 are arranged in a rotation around the direction perpendicular to the optical axis. The specific rotation angle in this embodiment is not absolutely limited and can be adaptively adjusted according to the actual requirements. For this, a plane mirror 5 is further provided between the optical lens 2 and at least one second reflector 4 in this embodiment to change the direction of the light rays refracted by the optical lens 2.

[0060] In summary, for the reflective optical module of this embodiment, the light rays of the light source 1 passing through the first reflector 3 can enter the optical lens 2 as much as possible. The deflection angle of the light rays reflected by the first reflector 3 is relatively large in the horizontal angle, which can make the light pattern of the final image wider in the left and right directions. After the light rays passing through the optical lens 2 are reflected by the second reflector 4, the mutual deflection angle in the up and down directions is smaller than that in the horizontal direction, so that the reflective optical module of this embodiment can image a light pattern that is wide in the left and right and narrow in the up and down.

[0061] Embodiment 2:

[0062] Based on the reflective optical module of Embodiment 1, this embodiment provides an illumination device, such as a vehicle headlight, including: the reflective optical module of Embodiment 1. The illumination device of the present invention has the reflective optical module of the present invention, and for the corresponding illumination device design, the illumination device can have a flat and wide shape. For example, the vehicle headlight can present a flattened shape.

[0063] Embodiment 3:

[0064] Based on the lighting device of Embodiment 2, this embodiment provides a vehicle, including the lighting device of Embodiment 2.

[0065] The above specific embodiments have further elaborated on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

[0066] In the description of the present invention, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0067] In the present invention, unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] In the description of the present invention, it should be noted that the terms indicating orientation or positional relationship such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0069] In addition, terms such as "horizontal", "vertical", "hanging", etc. do not mean that the component is required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0070] In the present invention, unless otherwise clearly stipulated and defined, the first feature being above or below the second feature may include the direct contact of the first and second features, or may include the contact of the first and second features not directly but through additional features therebetween. Moreover, the first feature being above, on top of, and over the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being below, beneath, and under the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

Claims

1. A reflective optical module, characterized in that, it includes: a light source and at least one first mirror, an optical lens, and at least one second mirror arranged in sequence along the optical axis direction; wherein the first mirror is arranged to be able to reflect the light emitted by the light source and make it enter the optical lens; the second mirror has a linear focus or an arc focus in the horizontal direction; the optical lens has a linear focus or an arc focus in the vertical direction; and the focal length of the second mirror is greater than the focal length of the optical lens; the incident surface of the optical lens is a flat end face or a curved surface; and the optical lens includes at least one light-emitting surface; the light-emitting surface is formed by sweeping the cross-section in the horizontal direction along the cross-section in the vertical plane or is formed by stretching the cross-section in the horizontal direction along the vertical direction; the focal line of the second mirror and the focal line of the optical lens jointly form the focal region of the reflective optical module; the optical lens includes at least two light-emitting surfaces; and the arc foci of at least two of the light-emitting surfaces are the same or not exactly the same; the reflecting surface of the second mirror is adapted to form the side wall of a bathtub-shaped light and dark cut-off line; and the optical lens is adapted to form the bottom wall of the light and dark cut-off line extending in the horizontal direction; the second mirror is formed by stretching a parabola with a focus in the focal region of the reflective optical module along the horizontal direction; or the second mirror is formed by sweeping a parabola with a focus located in the focal region of the reflective optical module along a curve in the horizontal plane.

2. The reflective optical module according to claim 1, characterized in that, the first mirror is a free-form surface mirror or a parabolic mirror; and the focal length of the first mirror is less than or equal to 3 mm.

3. The reflective optical module according to claim 1, characterized in that, the cross-section of the optical lens in the horizontal direction is a plano-convex curve or a convex-plano curve along the optical axis direction; and the cross-section of the optical lens in the vertical direction is a plano-convex curve or a plano-concave curve along the optical axis direction.

4. The reflective optical module according to claim 1, characterized in that, the light source, at least one first mirror, the optical lens, and at least one second mirror are arranged and distributed in a direction perpendicular to the optical axis.

5. The reflective optical module according to claim 1, characterized in that, the light source, at least one first mirror, the optical lens, and at least one second mirror are rotationally arranged around a direction perpendicular to the optical axis; and a plane mirror is further provided between the optical lens and at least one second mirror.

6. A lighting device, characterized in that, it includes: the reflective optical module according to any one of claims 1 to 5.

7. A vehicle, characterized in that, it includes: the lighting device according to claim 6.

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