Binocular zoom lens and vehicle lamp having the same

Abstract

The application discloses a dual-eye zoom lens and a vehicle lamp with the same, the dual-eye zoom lens comprising: a zoom projection light path and a DMD microlens, the zoom projection light path being arranged in the light emitting direction of the DMD microlens, the zoom projection light path comprising: a right-angle prism and an imaging lens group; the right-angle prism is used for receiving the light rays of the DMD microlens and adjusting the light ray path; the imaging lens group is arranged in the light emitting direction of the right-angle prism, the imaging lens group comprising a positive focal length lens group, a negative focal length lens group and a zoom lens group, the focal length of the zoom lens group being positive, the positive focal length lens group, the negative focal length lens group and the zoom lens group being sequentially arranged in the light emitting direction of the right-angle prism to form a positive-negative-positive Cooke lens structure. The application has the advantages of realizing the customization requirement of zooming and reducing the production difficulty.

Description

Technical Field

[0001] This invention belongs to the field of automotive lighting technology, specifically relating to automotive welcome lights, and more particularly to a binocular zoom lens and an automotive light having the same. Background Technology

[0002] With the increasing popularity of automobiles, there is a growing demand for personalized welcome lights. Currently, the static welcome light technology market is mature, but dynamic and editable welcome light technology is relatively scarce. Extending from existing consumer-grade projection technology, automotive dynamic projection technologies can be roughly divided into the following categories: digital display technology (DLP technology), laser scanning technology (LBS technology), and liquid crystal on silicon technology (LCOS technology). Due to the stringent regulations of automotive-grade testing, DLP technology is the most likely technology to be used in automotive welcome lights.

[0003] Because DLP technology requires lenses with a relatively long back focal length to deflect the light path, fixed-focus lenses reduce design and assembly complexity; therefore, DLP technology is commonly used with fixed-focus lenses. However, different scenarios require different focal length imaging lenses, and this limitation of fixed-focus lenses cannot meet the customized needs of DLP technology in the automotive lighting industry. To meet the customization needs of DLP technology in the automotive lighting industry, current methods often use controlling the cam curve to change the air gap of the lens group to achieve focal length changes. However, due to the difficulty in manufacturing the cam curve and the limitation of the zoom ratio, production is difficult and costly. To reduce production difficulty, a binocular zoom lens and an automotive light incorporating it are proposed. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0005] To this end, the present invention proposes a binocular zoom lens and a vehicle headlight having the same, which has the advantage of reducing production difficulty while meeting the customized zoom requirements.

[0006] According to an embodiment of the present invention, a binocular zoom lens includes: a zoom projection optical path and a DMD micromirror. The zoom projection optical path is disposed in the light-emitting direction of the DMD micromirror and includes: a right-angle prism and an imaging lens group. The right-angle prism is used to receive light from the DMD micromirror and adjust the light path. The imaging lens group is disposed in the light-emitting direction of the right-angle prism and includes a positive focal length lens group, a negative focal length lens group, and a zoom lens group. The focal length of the zoom lens group is positive. The positive focal length lens group, the negative focal length lens group, and the zoom lens group are arranged sequentially along the light-emitting direction of the right-angle prism to form a positive-negative-positive Cooke lens structure. The positive focal length lens group is used to converge light and bear the main optical power of the lens. The negative focal length lens group... Used to correct chromatic aberration and counteract the dispersion produced by the front and rear positive lenses; and to correct field curvature by balancing the Peswain sum of the entire system through its negative optical power, making the image field flat and ensuring that the center and edges are equally sharp; the zoom lens group includes a first light-emitting lens, a second light-emitting lens, and a reversing optical path lens. The reversing optical path lens is located on the light-emitting path of the negative focal length lens group. The reversing optical path lens is used to change the angle of light. The first light-emitting lens and the second light-emitting lens are located in the light-emitting direction of the reversing optical path lens. The first light-emitting lens and the second light-emitting lens are arranged side by side along the light-emitting direction of the negative focal length lens group. The first light-emitting lens and the second light-emitting lens have different focal lengths. The reversing optical path lens can move back and forth in a straight line along the light-emitting direction of the negative focal length lens group.

[0007] The light pattern imaged by the DMD micromirror is directed towards the imaging lens group by a right-angle prism. The imaging lens group employs a movable, reversible optical path lens. By controlling the reversible optical path lens to align with either the first or second light-emitting lens, different focal lengths can be achieved. Since all lenses in the imaging lens group, except for the reversible optical path lens, have fixed relative positions to the DMD micromirror, different focal lengths can be achieved simply by moving the reversible optical path lens linearly. Therefore, the assembly of each component does not require a complex structure, thus reducing assembly and manufacturing complexity. Furthermore, the two focal lengths share the positive and negative focal length lens groups, enabling customized zoom capabilities while reducing the number of components required, thus meeting the miniaturization needs of automotive lights.

[0008] According to one embodiment of the present invention, the right-angle prism, the positive focal length lens group, the negative focal length lens group, the refracting optical path lens, and the first exiting lens constitute a short focal length mode; the right-angle prism, the positive focal length lens group, the negative focal length lens group, the refracting optical path lens, and the second exiting lens constitute a long focal length mode; the focal length F1 of the short focal length mode and the focal length F2 of the long focal length mode, together with the sum F of the focal lengths of the positive and negative focal length lens groups, satisfy F1 < F < F2. The focal length F1 is 7.5 mm, and the focal length F2 is 12 mm.

[0009] According to one embodiment of the present invention, the positive focal length lens group includes: a first positive focal length lens, a second positive focal length lens, and a third positive focal length lens; the first positive focal length lens is a concave-convex lens; the second positive focal length lens is a biconvex lens; and the third positive focal length lens is a biconvex lens.

[0010] According to one embodiment of the present invention, the negative focal length lens group includes a negative focal length lens, the negative focal length lens is a biconcave lens, and the negative focal length lens is high dispersion glass.

[0011] According to one embodiment of the present invention, both the first light-emitting lens and the second light-emitting lens are concave and convex lenses, and at least two of the lenses in the positive focal length lens group, the negative focal length lens group, the first light-emitting lens, and the second light-emitting lens are made of materials that satisfy an Abbe number ≤ 30.

[0012] By setting at least two lenses with an Abbe number ≤ 30, an optical design that combines high and low Abbe number lenses is achieved, correcting total chromatic aberration and improving image sharpness and color reproduction. Simultaneously, it avoids correcting chromatic aberration by adding more lenses, improving illumination while ensuring miniaturization.

[0013] Specifically, both the short focal length and long focal length modes employ a 5-element aspherical lens architecture and are designed to achieve 1.6x zoom. The aspherical lenses effectively correct geometric aberrations such as spherical aberration and coma. They utilize lens materials with a low Abbe number of ≤30, which, through their high dispersion sensitivity and strong refractive properties, can precisely match the curved surface design of the aspherical lenses. This, combined with the high Abbe number lenses, forms optical compensation, allowing various aberrations in the zoom optical path to be fully canceled out, ensuring the regularity of light propagation and laying the foundation for subsequent clear imaging.

[0014] A vehicle headlight with a binocular zoom lens includes any of the binocular zoom lenses described above, and further includes: multiple light source groups, a light mixing system, and a light equalization system; the multiple light source groups are respectively a first light source group, a second light source group, and a third light source group, which are used to emit light of different colors; the light mixing system is located in the light output direction of the multiple light source groups, and the light mixing system is used to mix the different colors of light emitted by the first light source group, the second light source group, and the third light source to form a three-color light beam, and to compress the volume of the three-color light beam to adapt to the compact space of a car; the light equalization system is located in the light output direction of the light mixing system, and the DMD micromirror is located in the light output direction of the light equalization system, and the light equalization system is used to form a uniform light spot on the DMD micromirror to ensure that the image has no dark corners and consistent brightness.

[0015] According to one embodiment of the present invention, the first light source group includes a red LED; the second light source group includes a blue LED; and the third light source group includes a green LED; the first light source group, the second light source group, and the third light source group all include a shaping lens and a collimating lens.

[0016] According to one embodiment of the present invention, the first light source group and the second light source group are arranged side by side, and the light emission direction of the first light source group is perpendicular to the light emission direction of the third light source group.

[0017] According to one embodiment of the present invention, the light emission direction of the first light source group is directly opposite to the light homogenization system.

[0018] The first, second, and third light source groups generate collimated red, blue, and green light, respectively. By placing the red and blue light sources on the same side, it achieves clear projection with high magnification ratios while also having the advantages of compact structural dimensions, reasonable heat dissipation distribution, and mitigation of color temperature shift caused by red light attenuation.

[0019] According to one embodiment of the present invention, the light equalization system includes: a compound eye lens, a light equalization correction lens, and a relay lens group; the compound eye lens is located on the light output path of the light mixing system, and is used to equalize the light spot and eliminate local bright spots or dark areas; the light equalization correction lens is located on the light output path of the compound eye lens, and is used to correct the propagation direction and aberration of light, making the light spot shape more regular, while ensuring that the light can be efficiently transmitted to the next stage; the relay lens group is located on the light output path of the light equalization correction lens, and the DMD micromirror is located on the light output path of the relay lens group, and the relay lens group is used to project the light spot onto the DMD micromirror and control the light spot size to ensure that the entire area of ​​the DMD micromirror is uniformly illuminated, avoiding dark corners in the image.

[0020] A rectangular spot is formed on the DMD micromirror, and the spot size satisfies: D1≥Dm+0.2mm, V1≥Vm+0.2mm; where D1 is the length of the long side of the rectangular spot, V1 is the length of the short side of the rectangular spot, Dm is the length of the long side of the DMD micromirror, and Vm is the length of the short side of the DMD micromirror; the length L of the right-angled side of the right-angled prism satisfies: 6mm≤L≤9mm.

[0021] According to one embodiment of the present invention, the light mixing system includes: a first light mixing lens, a second light mixing lens, and a condenser lens; the first light mixing lens is located on the light output path of the second light source group and the third light source group, and the first light mixing lens is used to guide the desired light emitted by the second light source group and the third light source group in the same direction; the second light mixing lens is located on the light output path of the first light source group and the first light mixing lens, and the second light mixing lens is used to guide the desired light emitted by the first light source group and the first light mixing lens in the same direction; the condenser lens is located between the first light mixing lens and the second light mixing lens, and the condenser lens is used to compress the beam volume emitted by the first light mixing lens.

[0022] The first light-mixing lens has a beam splitter that transmits green light and reflects blue light, and the second light-mixing lens has a beam splitter that transmits red light and reflects both blue and green light. The specific parameters of the beam splitter that transmits green light and reflects blue light are: reflectivity ≤3% @500nm-680nm, reflectivity ≥98% @410nm-470nm; the specific parameters of the beam splitter that transmits red light and reflects both blue and green light are: reflectivity ≥98% @410nm-580nm, reflectivity ≤3% @600nm-660nm.

[0023] The condenser lens is a convex lens with a positive focal length, located between the first and second light-mixing lenses.

[0024] The beneficial effects of this invention are that it employs a movable flexure optical path lens, and by controlling the flexure optical path lens to correspond with either the first or second light-emitting lens, different focal lengths of illumination can be achieved. Since the relative positions of all lenses in the imaging lens group, except for the flexure optical path lens, to the DMD micromirrors are fixed, different focal lengths of illumination can be achieved simply by moving the flexure optical path lens linearly. Therefore, the assembly of each component does not require a complex structure, thus reducing assembly difficulty and the manufacturing difficulty of each component. Furthermore, the two focal lengths share the positive focal length lens group and the negative focal length lens group, enabling customized zoom requirements while reducing the number of parts needed, thus meeting the application scenarios of miniaturized automotive lights.

[0025] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention.

[0026] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1This is a side view of the overall structure of the present invention; Figure 2 This is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 3 This is a schematic diagram of the structure in the short focal length mode of the present invention; Figure 4 This is a schematic diagram of the structure in telephoto mode of the present invention; Figure 5 This is the lens parameter table for the short focal length mode of this invention; Figure 6 This is the aspherical coefficient table corresponding to the aspherical surface in the short focal length mode of this invention; Figure 7 This is the lens parameter table for the telephoto mode of this invention; Figure 8 This is the aspherical coefficient table corresponding to the aspherical surface in the telephoto mode of this invention; Figure 9 This is a graph showing the relationship between the MTF value and image height of the projection system at 16 LP / MM in the telephoto mode of this invention. Figure 10 This is a graph showing the relationship between the projection system distortion value and the field of view in the telephoto mode of this invention; Figure 11 This is a graph showing the relationship between the MTF value and image height of the projection system at 16 LP / MM in the short-throw mode of this invention. Figure 12 This is a graph showing the relationship between the projection system distortion value and the field of view in the short-throw mode of this invention; Figure 13 This is the RGB_LED light source power parameter table of this invention; Figure 14 This is a schematic diagram showing the temperature status of the red LED and green LED on the same LED panel according to the present invention; Figure 15 This is a schematic diagram showing the temperature state of the blue LED on another light panel according to the present invention; Figure 16 This is a schematic diagram showing the temperature status when the red LED and blue LED are on the same LED panel according to the present invention; Figure 17 This is a schematic diagram showing the temperature status of the green LED in this invention when it is on another light panel.

[0028] Figure label: 1. First light source group; 11. Red LED; 12. Shaping lens; 13. Collimating lens; 2. Second light source group; 21. Blue LED; 3. Third light source group; 31. Green LED; 41. First light mixing lens; 42. Second light mixing lens; 43. Condensing lens; 51. Compound eye lens; 52. Light homogenizing correction lens; 53. Relay lens group; 6. DMD micromirror; 7. Right angle prism; 81. First positive focal length lens; 82. Second positive focal length lens; 83. Third positive focal length lens; 84. Negative focal length lens; 85. Reversing optical path lens; 86. Second light-emitting lens; 87. First light-emitting lens. Detailed Implementation

[0029] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0030] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] The following describes in detail, with reference to the accompanying drawings, a binocular zoom lens and a vehicle headlight having thereon, according to embodiments of the present invention.

[0032] Example 1: The first light source group 1 and the second light source group 2 are arranged side by side in a left-right direction. A second light mixing lens 42 is obliquely arranged on the light output path of the first light source group 1. A compound eye lens 51, a light-diffusing correction lens 52, and a relay lens group 53 are arranged sequentially on the light output path of the second light mixing lens 42. A first light mixing lens 41 is obliquely arranged on the light output path of the second light source group 2. A third light source group 3 is arranged to the left of the second light source group 2, with the first light mixing lens 41 located on the light output path of the third light source group 3.

[0033] Since the first light mixing lens 41 has a beam splitter that transmits green light and reflects blue light, the green light emitted by the third light source group 3 passes through the first light mixing lens 41 and reaches the second light mixing lens 42. The blue light emitted by the second light source group 2 is reflected to the second light mixing lens 42 after passing through the first light mixing lens 41. The light paths of green light and blue light are unified through the first light mixing lens 41. A condenser lens 43 is provided between the first light mixing lens 41 and the second light mixing lens 42. The condenser lens 43 is used to compress the volume of the beam composed of green light and blue light.

[0034] Since the second mixing lens 42 has a beam splitter that transmits red light and reflects blue and green light, the red light emitted by the first light source group 1 passes through the second mixing lens 42 and is directed towards the compound eye lens 51, while the green and blue light are reflected to the direction of the compound eye lens 51 after passing through the second mixing lens 42. Therefore, the second mixing lens 42 unifies the light paths of the three colors and forms a three-color beam.

[0035] By dividing the first light source group 1 and the third light source group 3, the red LED 11 and the green LED 31 are distributed on different PCB boards, thus optimizing the heat dissipation distribution of the DLP module and reducing the color temperature shift caused by red light attenuation.

[0036] The compound eye lens 51 is located directly above the first light source group 1, and the uniform light correction lens 52 and the relay lens group 53 are sequentially arranged upwards along the light output direction of the first light source group 1. The three-color beams pass through the compound eye lens 51, the uniform light correction lens 52, and the relay lens group 53 in sequence. Under the action of the compound eye lens 51, the uniform light correction lens 52, and the relay lens group 53, a uniform light spot is achieved, local bright spots or dark areas are eliminated, the propagation direction and aberrations of light are corrected, and the light spot size is controlled to ensure light efficiency. This ensures that the entire area of ​​the DMD micromirror 6 is uniformly illuminated, avoiding vignetting in the image.

[0037] The DMD micromirror 6 is located above the relay lens group 53, and the right-angle prism 7 is located on one side of the relay lens group 53 and below the DMD micromirror 6. The tri-color light beam emitted from the relay lens group 53 passes through the right-angle prism 7 and reaches the DMD micromirror 6. Under the action of the DMD micromirror 6, it enters the right-angle prism 7 and is reflected by the right-angle prism 7 to the imaging lens group. The imaging lens group is located to the left of the right-angle prism 7. From the right-angle prism 7 to the left, the first positive focal length lens 81, the second positive focal length lens 82, the third positive focal length lens 83, the negative focal length lens 84, and the directional light path lens 85 are arranged in sequence. Above the moving path of the directional light path lens 85, the first light-emitting lens 87 and the second light-emitting lens 86 are arranged in sequence. The light reflected by the right-angle prism 7 passes through the first positive focal length lens 81, the second positive focal length lens 82, the third positive focal length lens 83, the negative focal length lens 84, and the directional light path lens 85 in sequence, and is reflected upward by the directional light path lens 85. By moving the directional light path lens 85, the position of the directional light path lens 85 can be controlled, so as to select whether the light is emitted from the first light-emitting lens 87 or the second light-emitting lens 86.

[0038] In the aforementioned light path, regardless of whether the telephoto or short-focal-length mode is selected, the light rays share the same first positive focal length lens 81, second positive focal length lens 82, third positive focal length lens 83, negative focal length lens 84, and reversing optical path lens 85. Only the paths of the first exiting lens 87 or the second exiting lens 86 differ. Therefore, the components are fully utilized, reducing the number of components, shrinking the size requirements, lowering costs, and simplifying the assembly process. Furthermore, by arranging the first light source group 1 and the second light source group 2 along the left-right direction, the vertical dimensions are reduced. The space occupied by the second light source group 2 and the third light source group 3 in the left-right direction utilizes the space of the imaging lens group. In other words, the second light source group 2 and the third light source group 3 are rationally arranged within the left-right space required by the imaging lens group itself, avoiding additional increases in left-right dimensions. Therefore, through efficient space arrangement, the overall size is reduced, meeting the requirements of a small-size design.

[0039] like Figure 5 The image shows the lens parameters for short focal length mode. The aspherical equation can be calculated using the following formula:

[0040] Where z: distance from the lens vertex to the optical axis, c: fundamental curvature of the lens, r: distance perpendicular to the optical axis, and k: conic constant. Aspheric coefficient : Radial coordinate, N: Number of items set, i: Subscript coefficient. Optical axis definition: A straight line passing through the centers of the two spherical surfaces (or rotationally symmetric aspherical surfaces) of the lens.

[0041] The aspherical coefficients corresponding to the aspherical surfaces in short focal length mode are as follows: Figure 6 As shown.

[0042] like Figure 7 The image shows the lens parameters for telephoto mode. The aspherical equation can be calculated using the following formula:

[0043] Where z: distance from the lens vertex to the optical axis, c: fundamental curvature of the lens, r: distance perpendicular to the optical axis, and k: conic constant. Aspheric coefficient : Radial coordinate, N: Number of items set, i: Subscript coefficient. Optical axis definition: A straight line passing through the centers of the two spherical surfaces (or rotationally symmetric aspherical surfaces) of the lens.

[0044] The aspherical coefficient corresponding to the aspherical surface in telephoto mode is as follows: Figure 8 As shown.

[0045] like Figure 9 The figure shows the relationship between the MTF value and image height of the projection system at 16 LP / MM in telephoto mode; the horizontal axis represents the image height value, the vertical axis represents the MTF value, the solid line represents the meridian, and the dashed line represents the sagittal line; it can be seen from the figure that the imaging lens has an MTF value of >50% across the entire field of view at 16 LP / MM, which can achieve a clear projection effect.

[0046] like Figure 10 The figure shows the relationship between the projection system distortion value and the field of view in telephoto mode; the horizontal axis represents the distortion value, and the vertical axis represents the field of view. As can be seen from the figure, the distortion value of the imaging lens across the entire field of view is <5%, which effectively reproduces the projected pattern.

[0047] like Figure 11 The figure shows the relationship between the MTF value and image height of the projection system at 16 LP / MM in short-throw mode; the horizontal axis represents the image height value, the vertical axis represents the MTF value, the solid line represents the meridian, and the dashed line represents the sagittal line; it can be seen from the figure that the imaging lens has an MTF value of >50% across the entire field of view at 16 LP / MM, which can achieve a clear projection effect.

[0048] like Figure 12 The graph shows the relationship between the projection system distortion value and the field of view in short-throw mode; the horizontal axis represents the distortion value, and the vertical axis represents the field of view. As can be seen from the graph, the distortion value of the imaging lens across the entire field of view is <5%, which effectively reproduces the projected pattern.

[0049] like Figure 14-17 As shown, Figure 14-17 For RGB_LED light source according to Figure 13The power was simulated at an ambient temperature of 25℃, and the PCB board temperature was measured after 30 minutes of heat simulation. Figure 14 This indicates that red LED11 and green LED31 are on one light panel. Figure 15 This indicates the state of blue LED21 on another light panel. At this time, the highest temperature of the light panel for red LED11 and green LED31 reaches 76.8℃, and the highest temperature of the light panel for blue LED21 reaches 56.9℃.

[0050] Figure 16 This indicates that red LED11 and blue LED21 are on one light panel. Figure 17 The diagram shows that green LED31 is on a separate LED panel. At this point, the highest panel temperature for red LED11 and blue LED21 reaches 62.9℃, while the highest panel temperature for green LED31 reaches 89.4℃. As can be seen from the diagram, adjusting the positions of blue LED21 and green LED31 reduces the temperature of red LED11 by approximately 12℃, increases the junction temperature of green LED31 by approximately 12℃, and increases the junction temperature of blue LED21 by approximately 5℃. However, because red LED11 experiences greater light decay, while blue LED21 and green LED31 experience less light decay, under the same operating conditions, considering light decay, the overall luminous flux of the module can be increased by approximately 6%.

[0051] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0052] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A binocular zoom lens, characterized in that, include: A zoom projection optical path and a DMD micromirror (6), wherein the zoom projection optical path is located in the light-emitting direction of the DMD micromirror (6), and the zoom projection optical path includes: A right-angle prism (7) is used to receive light from the DMD micromirror (6) and adjust the light path; An imaging lens group is provided in the light-emitting direction of the right-angle prism (7). The imaging lens group includes a positive focal length lens group, a negative focal length lens group and a zoom lens group. The focal length of the zoom lens group is positive. The positive focal length lens group, the negative focal length lens group and the zoom lens group are arranged sequentially along the light-emitting direction of the right-angle prism (7) to form a positive-negative-positive Cook lens structure. The positive focal length lens group is used to converge light rays and bears the main optical power of the lens; The negative focal length lens group is used to correct chromatic aberration, counteract the chromatic dispersion produced by the front and rear positive lenses, and correct field curvature by balancing the Peswain sum of the entire system through its negative optical power, making the image field flat and ensuring that the center and the edges are equally sharp. The zoom lens group includes a first light-emitting lens (87), a second light-emitting lens (86), and a reversing optical path lens (85). The reversing optical path lens (85) is located on the light-emitting path of the negative focal length lens group and is used to change the angle of light. The first light-emitting lens (87) and the second light-emitting lens (86) are located in the light-emitting direction of the reversing optical path lens (85). The first light-emitting lens (87) and the second light-emitting lens (86) are arranged side by side along the light-emitting direction of the negative focal length lens group. The first light-emitting lens (87) and the second light-emitting lens (86) have different focal lengths. The reversing optical path lens (85) can move back and forth in a straight line along the light-emitting direction of the negative focal length lens group.

2. The binocular zoom lens according to claim 1, characterized in that, The right-angle prism (7), the positive focal length lens group, the negative focal length lens group, the folding optical path lens (85), and the first light-emitting lens (87) form a short focal length mode. The right-angle prism (7), the positive focal length lens group, the negative focal length lens group, the folding optical path lens (85), and the second light-emitting lens (86) form a long focal length mode. The focal length F1 of the short focal length mode and the focal length F2 of the long focal length mode, together with the sum F of the focal lengths of the positive focal length lens group and the negative focal length lens group, satisfy F1 < F < F2.

3. The binocular zoom lens according to claim 1, characterized in that, The positive focal length lens group includes: The first positive focal length lens (81) is a concave-convex lens; The second positive focal length lens (82) is a biconvex lens; The third positive focal length lens (83) is a biconvex lens.

4. The binocular zoom lens according to claim 1, characterized in that, The negative focal length lens group includes a negative focal length lens (84), which is a biconcave lens.

5. The binocular zoom lens according to claim 1, characterized in that, Both the first light-emitting lens (87) and the second light-emitting lens (86) are concave and convex lenses. Among the positive focal length lens group, the negative focal length lens group, the first light-emitting lens (87) and the second light-emitting lens (86), at least two lenses are made of materials that satisfy an Abbe number ≤ 30.

6. A vehicle headlight with a binocular zoom lens, characterized in that, The lens, including the binocular zoom lens as described in any one of claims 1-5, further includes: Multiple light source groups, namely a first light source group (1), a second light source group (2) and a third light source group (3), wherein the first light source group (1), the second light source group (2) and the third light source group (3) are used to emit light of different colors; A light mixing system is located in the light output direction of multiple light source groups. The light mixing system is used to mix the light of different colors emitted by the first light source group, the second light source group, and the third light source to form a three-color light beam and to compress the volume of the three-color light beam. The light homogenizing system is located in the light output direction of the light mixing system, and the DMD micromirror (6) is located in the light output direction of the light homogenizing system. The light homogenizing system is used to form a uniform light spot on the DMD micromirror (6).

7. The vehicle headlight with a binocular zoom lens according to claim 6, characterized in that, The first light source group (1) includes a red LED (11); the second light source group (2) includes a blue LED (21); the third light source group (3) includes a green LED (31); the first light source group (1), the second light source group (2) and the third light source group (3) each include a shaping lens (12) and a collimating lens (13).

8. The vehicle headlight with a binocular zoom lens according to claim 6, characterized in that, The light emission direction of the first light source group (1) is directly opposite the light equalization system. The first light source group (1) and the second light source group (2) are arranged side by side. The light emission direction of the first light source group (1) is perpendicular to the light emission direction of the third light source group (3).

9. The vehicle headlight with a binocular zoom lens according to claim 6, characterized in that, The light homogenization system includes: Compound eye lens (51), the compound eye lens (51) is located on the light output path of the light mixing system, the compound eye lens (51) is used to uniform light spot and eliminate local bright spots or dark areas; A light-correcting lens (52) is located on the light-exit path of the compound eye lens (51). The light-correcting lens (52) is used to correct the propagation direction and aberration of light rays. The relay lens group (53) is located on the light output path of the uniform light correction lens (52), and the DMD micromirror (6) is located on the light output path of the relay lens group (53). The relay lens group (53) is used to project the light spot onto the DMD micromirror (6) and control the size of the light spot to ensure that the entire area of ​​the DMD micromirror (6) is uniformly illuminated and to avoid dark corners in the image.

10. The vehicle headlight with a binocular zoom lens according to claim 6, characterized in that, The light mixing system includes: The first light mixing lens (41) is located on the light output path of the second light source group (2) and the third light source group (3). The first light mixing lens (41) is used to guide the desired light emitted by the second light source group (2) and the third light source group (3) in the same direction. The second light mixing lens (42) is located on the light output path of the first light source group (1) and the first light mixing lens (41). The second light mixing lens (42) is used to guide the desired light emitted by the first light source group (1) and the first light mixing lens (41) in the same direction. A condenser lens (43) is located between a first light mixing lens (41) and a second light mixing lens (42). The condenser lens (43) is used to compress the volume of the light beam emitted by the first light mixing lens (41).

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