Lens, communication projection vehicle lamp and optical communication system

Abstract

The utility model belongs to the technical field of optical devices, and relates to a lens, a communication projection vehicle lamp and an optical communication system. The lens comprises a first positive lens, a first negative lens, a second positive lens, a second negative lens, a third positive lens, a diaphragm, a fourth positive lens, a third negative lens, a fifth positive lens and a sixth positive lens which are sequentially and coaxially arranged from the object side to the image side along the optical axis. The object side surfaces of the first positive lens, the first negative lens, the second positive lens, the third positive lens and the sixth positive lens are convex surfaces. The object side surfaces of the second negative lens, the fourth positive lens, the third negative lens and the fifth positive lens are concave surfaces; the image side surfaces of the second positive lens, the fourth positive lens and the fifth positive lens are convex surfaces; the image side surfaces of the second negative lens and the third negative lens are concave surfaces. According to the lens provided by the scheme, the propagation path of light is accurately controlled by utilizing the multi-stage lenses and the concave-convex surfaces of the lenses, and meanwhile, the large field angle, low aberration and high resolution are considered.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical device technical field especially relates to a lens, communication projection car lamp and optical communication system. BACKGROUND

[0002] The lens can control the propagation path of light, project the object (for example, the modulation pattern generated by the digital micromirror chip) on the screen or other receiving plane according to certain scale and definition, and realize clear imaging. With the progress of computer technology, display technology and optical material science, the lens has been widely used in various fields. At the same time, in order to improve the imaging quality, the requirements for the field of view, resolution and aberration of the lens are also higher and higher.

[0003] The traditional lens adopts simple lens combination, generally composed of several lenses with different curvatures and refractive indexes, for example, double cemented lens or three-piece lens combination. The lens combination with different dispersion characteristics can make different colors of light better converge on the same plane during imaging. This lens structure is relatively simple, but the optical performance is limited, and there are deficiencies in correcting aberration, improving imaging resolution and contrast. It is suitable for occasions with low optical performance requirements. In order to improve the imaging quality of the lens, the existing lens is mostly composed of multiple lenses. By changing the arrangement and curvature of the lens, the convergence and divergence of light can be controlled. However, when the lens refracts light at a large angle, aberration is easy to occur. The existence of aberration will make the convergence points of light with different incident angles different, resulting in blurred imaging details and reduced imaging resolution. In order to reduce aberration and improve imaging quality, the field of view of the lens often needs to be reduced, so that the light entering the lens is closer to the optical axis, resulting in a small field of view of the lens, which affects the imaging range of the lens. Therefore, the existing lens cannot balance large field of view, low aberration and high resolution. SUMMARY

[0004] Therefore, the technical problem to be solved by the present application is to overcome the problem that the existing lens cannot balance large field of view, low aberration and high resolution.

[0005] To solve the above technical problems, the present application provides a lens, which comprises a first positive lens, a first negative lens, a second positive lens, a second negative lens, a third positive lens, a diaphragm, a fourth positive lens, a third negative lens, a fifth positive lens and a sixth positive lens arranged coaxially along the optical axis from the object side to the image side.

[0006] Among them, the object side surface of the first positive lens, the first negative lens, the second positive lens, the third positive lens and the sixth positive lens is a convex surface; the object side surface of the second negative lens, the fourth positive lens, the third negative lens and the fifth positive lens is a concave surface.

[0007] The image side surface of the second positive lens, the fourth positive lens and the fifth positive lens is convex; and the image side surface of the second negative lens and the third negative lens is concave.

[0008] In the present application, nine positive and negative spherical lenses are arranged alternately to form a coaxial system, the convex object side surface of the first positive lens effectively collects light, the concave object side surface of the first negative lens properly diverges the light collected by the first positive lens, adjusts the angle of the light, so that the incident light of a large field of view exits at a relatively gentle angle, then the second positive lens is used to suppress the degree of divergence of the light, the second negative lens is used to adjust the propagation path of the light again, to further correct the chromatic aberration and field curvature, the third positive lens is used to further converge the light, to strengthen the effect of correcting chromatic aberration, so that the light is further flattened, the fourth positive lens and the third negative lens can correct spherical aberration more accurately, and finally the fifth positive lens and the sixth positive lens are used to converge the light, to reduce aberration and distortion by reducing the angle of the light, and to compensate for chromatic aberration, by accurately controlling the propagation path of the light through the arrangement of multiple lenses and the concave-convex surfaces of the lenses, the lens can adapt to a wider range of light angles, increase the field of view, and through the alternating combination of positive and negative lenses, the different effects of positive and negative lenses on off-axis light correct aberration, thereby reducing aberration and improving imaging resolution.

[0009] Preferably, the second positive lens and the second negative lens are cemented into a cemented body; and / or

[0010] The fourth positive lens and the third negative lens are cemented into a cemented body.

[0011] In the present application, the cemented body of the Gauss structure composed of positive and negative lenses can compensate for chromatic aberration by using the different effects of positive and negative lenses on light, while reducing the optical path difference of light of different colors, thereby effectively reducing chromatic aberration in the light.

[0012] Preferably, the optical refractive index of the first positive lens, the second positive lens and the sixth positive lens is greater than 1.9, and the optical Abbe number is greater than 17.5; and / or

[0013] The optical refractive index of the third positive lens, the fourth positive lens and the fifth positive lens is greater than 1.5, and the optical Abbe number is greater than 66; and / or

[0014] The optical refractive index of the first negative lens, the second negative lens and the third negative lens is greater than 1.75, and the optical Abbe number is greater than 17.9.

[0015] In the present application, by adjusting the optical refractive index and the optical Abbe number of each lens, the lens can have sufficient converging or diverging capacity to improve the optical efficiency, while avoiding excessive refractive index to generate too much aberration to affect the resolving power of the lens, so that the high optical efficiency and resolving power of the lens can be balanced.

[0016] Preferably, the ratio of the focal length of the third positive lens to the effective aperture is in the range of .

[0017] In the present application, by adjusting the ratio of the focal length of the third positive lens to the effective aperture, the third positive lens can be optimized for spherical aberration under sufficient light flux, so that the converging effect of the third positive lens on light is more uniform, thereby improving the imaging quality of the lens.

[0018] Preferably, the first positive lens, the first negative lens, the second positive lens, the second negative lens, the third positive lens, the fourth positive lens, the third negative lens, the fifth positive lens and the sixth positive lens are all glass lenses.

[0019] In the present application, each lens is a glass lens, which can improve the light transmittance, reduce stray light and aberration, thereby reducing the dispersion of the lens and improving the imaging quality of the lens; at the same time, the glass lens has better high and low temperature resistance, thereby reducing the influence of temperature on the imaging quality of the lens and further ensuring the imaging quality of the lens.

[0020] Preferably, the half field angle of the lens is in the range of and / or

[0021] The ratio of the length of the lens to the focal length is in the range of ; and / or

[0022] The ratio of the back focal length of the lens to the focal length is in the range of ; and / or

[0023] The telecentric angle of the lens is less than 0.2°.

[0024] In the present application, by adjusting the characteristic parameters of the lens, the field angle of the lens can be further increased, and the illumination distribution of the lens can be more uniform.

[0025] The present application also provides a communication projection vehicle lamp, comprising:

[0026] An illumination system for projecting a light beam;

[0027] A spatial light modulator for generating a modulation pattern based on the light beam projected by the illumination system;

[0028] The lens is used for projecting the modulation pattern to emit a visible light signal.

[0029] In the present application, the communication projection vehicle lamp designed by the lens can realize a large field of view, expand the range of visibility, and reduce the illumination communication blind area of the communication projection vehicle lamp during vehicle driving.

[0030] Preferably, the illumination system comprises:

[0031] a light source for emitting light rays;

[0032] a collimating lens group arranged on an outgoing light path of the light source, for collimating the light rays emitted by the light source so that the collimated light rays are incident on an integrator device in parallel;

[0033] an integrator device arranged on an outgoing light path of the collimating lens group, for dividing the light rays emitted by the collimating lens group into a plurality of fine light beams;

[0034] an integrating lens group arranged on an outgoing light path of the integrator device, for converging the fine light beams emitted by the integrator device to the spatial light modulator.

[0035] Preferably, the focal length of the collimating lens group is in a range of , and the effective aperture is in a range of ; the collimated light rays emitted by the collimating lens group have a divergence angle less than or equal to 10°; and / or

[0036] the integrator device is a compound eye lens; and / or

[0037] the integrating lens group is a right-angle total internal reflection prism; and / or

[0038] the focal length of the integrating lens group is in a range of .

[0039] In the present application, by adjusting the parameters of the collimating lens group and the integrating lens group, the brightness uniformity and light energy utilization of the illumination system can be improved.

[0040] The present application also provides a light communication system comprising the communication projection vehicle lamp.

[0041] The lens provided in this application includes a first positive lens, a first negative lens, a second positive lens, a second negative lens, a third positive lens, an aperture stop, a fourth positive lens, a third negative lens, a fifth positive lens, and a sixth positive lens, which are coaxially arranged along the optical axis from the object side to the image side. The object-side surfaces of the first positive lens, the first negative lens, the second positive lens, the third positive lens, and the sixth positive lens are all convex, while the object-side surfaces of the second negative lens, the fourth positive lens, the third negative lens, and the fifth positive lens are all concave. The image-side surfaces of the second positive lens, the fourth positive lens, and the fifth positive lens are all convex, while the image-side surfaces of the second negative lens and the third negative lens are all concave. Nine alternating positive and negative spherical lenses form a coaxial system. The convex side of the first positive lens effectively collects light, while the concave side of the first negative lens appropriately diverges the converged light, adjusting the angle of the light so that the incident light rays in the large field of view exit at a relatively gentle angle. Then, the second positive lens suppresses the divergence of the light, and the second negative lens again adjusts the propagation path of the light, further correcting chromatic aberration and field curvature. The third positive lens further converges the light, enhancing the effect of chromatic aberration correction and making the light rays even flatter. The fourth positive lens and the third negative lens can perform more precise correction of spherical aberration. Finally, the fifth and sixth positive lenses converge the light, reducing aberrations and distortion by decreasing the light angle, while compensating for chromatic aberration. Through the multi-stage lens and the setting of the concave and convex surfaces of each lens, the propagation path of the light is precisely controlled, allowing the lens to adapt to a wider range of light angles and increase the field of view. At the same time, by alternating positive and negative lenses, the different effects of the positive and negative lenses on off-axis light rays mutually correct aberrations, thereby reducing aberrations and improving imaging resolution. Attached Figure Description

[0042] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0043] Figure 1 A schematic diagram of the lens structure provided in this application;

[0044] Figure 2 A structural schematic diagram of the communication projection vehicle lamp provided in this application;

[0045] Figure 3 A dot plot of the visible light bands of the lens in each field of view provided in the embodiments of this application; wherein, Figure 3 (a) in the diagram is a point chart of the visible light band at the first field of view of the lens. Figure 3 (b) in the diagram is a dot plot of the visible light band at the second field of view of the lens. Figure 3 (c) in the diagram is a dot plot of the visible light band at the third field of view of the lens. Figure 3 (d) in the diagram represents the dot plot of the visible light band at the fourth field of view of the lens.Figure 3 (e) in the diagram is a dot plot of the visible light band at the fifth field of view of the lens. Figure 3 (f) in the diagram represents the visible light band of the lens's sixth field of view;

[0046] Figure 4 A modulation transfer function curve of a lens provided in an embodiment of this application;

[0047] Figure 5 Field curvature and distortion curves of a lens provided in an embodiment of this application; wherein, Figure 5 (a) in the figure is the field curvature curve of the shot. Figure 5 (b) in the figure is the distortion curve of the lens;

[0048] Figure 6 A transverse chromatic aberration diagram of a lens provided in an embodiment of this application;

[0049] Figure 7 A relative illumination diagram of a lens provided in an embodiment of this application;

[0050] Explanation of reference numerals in the accompanying drawings: 1. Lens; 10. First positive lens; 11. First negative lens; 12. Second positive lens; 13. Second negative lens; 14. Third positive lens; 15. Aperture stop; 16. Fourth positive lens; 17. Third negative lens; 18. Fifth positive lens; 19. Sixth positive lens; 2. Illumination system; 20. Light source; 21. Collimating lens group; 211. First collimating lens; 212. Second collimating lens; 22. Beam homogenizer; 23. Integrating lens group; 231. First relay lens; 232. Second relay lens; 24. Prism; 25. Protective glass; 3. Spatial light modulator. Detailed Implementation

[0051] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0052] Please see Figure 1 , Figure 1 The diagram shown is a structural schematic of the lens 1 provided in this application. The lens 1 can be a DLP (Digital Light Processing) lens. The lens 1 includes a first positive lens 10, a first negative lens 11, a second positive lens 12, a second negative lens 13, a third positive lens 14, an aperture 15, a fourth positive lens 16, a third negative lens 17, a fifth positive lens 18, and a sixth positive lens 19, which are arranged coaxially from the object side to the image side along the optical axis.

[0053] The object side of the first positive lens 10, the first negative lens 11, the second positive lens 12, the third positive lens 14 and the sixth positive lens 19 are all convex. The object side of the second negative lens 13, the fourth positive lens 16, the third negative lens 17 and the fifth positive lens 18 are all concave. The image side of the second positive lens 12, the fourth positive lens 16 and the fifth positive lens 18 are all convex. The image side of the second negative lens 13 and the third negative lens 17 are both concave.

[0054] Further, the second positive lens 12 and the second negative lens 13 are cemented into a cemented body.

[0055] Further, the fourth positive lens 16 and the third negative lens 17 are cemented into a cemented body.

[0056] Cementing the positive lens and the negative lens together can use the chromatic aberration generated by the negative lens to the positive lens to make reverse compensation, so that the convergence points of light rays of different colors are closer, thereby reducing chromatic aberration; at the same time, the cemented body form can make the optical system more compact, and also can ensure the stability of the optical system.

[0057] Further, the optical refractive index of the first positive lens 10, the second positive lens 12 and the sixth positive lens 19 are all greater than 1.9, and the optical Abbe number is all greater than 17.5. The optical refractive index of the third positive lens 14, the fourth positive lens 16 and the fifth positive lens 18 are all greater than 1.5, and the optical Abbe number is all greater than 66. The optical refractive index of the first negative lens 11, the second negative lens 13 and the third negative lens 17 are all greater than 1.75, and the optical Abbe number is all greater than 17.9.

[0058] Specifically, a higher optical refractive index can make the lens have stronger convergence or divergence ability to light rays, which is helpful to improve the optical efficiency, but when the light rays propagate in the lens with high refractive index, the refraction of the lens to light rays at different positions and angles is relatively complex, which is easy to produce aberration, resulting in blurred imaging details and reduced resolving power. At the same time, the lens with high optical Abbe number has weak chromatic dispersion characteristics, that is, the refractive index difference of light rays of different wavelengths in the lens is small, which means that different colors of light will not be too dispersed in the propagation process, and can be effectively converged and utilized, reducing the light loss caused by dispersion and improving the optical efficiency. At the same time, the lens with high optical Abbe number can make the convergence of light rays of different colors closer, thereby improving the resolving power. Based on this, the present application adjusts the optical refractive index and the optical Abbe number of each lens, which can ensure that the lens 1 has sufficient convergence or divergence ability to improve the optical efficiency, while avoiding too much aberration caused by high refractive index to affect the resolving power of the lens, so as to balance the high optical efficiency and the resolving power of the lens 1.

[0059] Further, in some embodiments of the present application, the ratio of the focal length of the third positive lens 14 to the effective aperture is in the range of For example, the ratio of the focal length to the effective aperture of the third positive lens 14 can be 3.1, 3.15, 3.2, 3.25, 3.3, 3.35, 3.4, or 3.45.

[0060] By adjusting the ratio of the focal length to the effective aperture of the third positive lens 14, the third positive lens 14 can optimize spherical aberration under sufficient light flux, making the light-gathering effect of the third positive lens 14 more uniform, thereby improving the imaging quality of the lens 1.

[0061] Furthermore, in some embodiments of this application, the first positive lens 10, the first negative lens 11, the second positive lens 12, the second negative lens 13, the third positive lens 14, the fourth positive lens 16, the third negative lens 17, the fifth positive lens 18, and the sixth positive lens 19 are all glass lenses. This is because glass lenses have higher light transmittance, less stray light, and smaller aberrations, which helps to reduce chromatic aberration in the projection lens, thereby improving the imaging quality of the projection lens. At the same time, glass lenses have higher resistance to high and low temperatures, thus reducing the impact of temperature on image quality and further ensuring the imaging effect.

[0062] Furthermore, the range of values ​​for the half-field angle of lens 1 is as follows: For example, the half-field angle of lens 1 can be 0°, 18°, 28°, 38°, 48°, 58°, or 68°. And / or, the ratio of the length of lens 1 to its focal length can range from... For example, the ratio of lens 1's length to its focal length can be 7.5, 7.7, 7.9, 8.1, or 8.3. And / or, the range of the ratio of lens 1's back focal length to its focal length is... For example, the ratio of the back focal length to the focal length of lens 1 may be 2.6, 2.7, 2.8 or 2.9; and / or, the telecentric angle of lens 1 is less than 0.2°; for example, the telecentric angle of lens 1 may be 0.17°, 0.18° or 0.19°.

[0063] By adjusting the characteristic parameters of lens 1, the field of view of lens 1 can be further increased, thereby satisfying the image-side telecentric design and making the illumination distribution of lens 1 more uniform.

[0064] Based on the lens provided in the above embodiments, this application also provides a communication projection vehicle light, such as... Figure 2 As shown, Figure 2 This is a schematic diagram of the structure of the communication projection vehicle lamp provided in this application. The communication projection vehicle lamp includes a lighting system 2, a spatial light modulator 3, and a lens 1 provided in the above embodiment.

[0065] The illumination system 2 is configured to project a light beam. The spatial light modulator 3 is configured to generate a modulation pattern based on the light beam projected by the illumination system 2. The lens 1 is configured to project the modulation pattern, thereby emitting a visible light signal.

[0066] Specifically, the spatial light modulator 3 comprises a digital micro-mirror chip.

[0067] The communication projection vehicle lamp provided in the present application utilizes the illumination system 2 to optimize the shaping of the light source, so that the light signal projection area of the communication projection vehicle lamp is uniform in brightness, which is conducive to the reception of the light signal. Meanwhile, the spatial light modulator 3 has the function of high-speed modulation of the light beam, and can realize accurate control of the illumination image. Finally, the lens 1 is utilized to project the light beam modulated by the spatial light modulator 3 to the communication area, which not only can control the irradiation area of the light beam, but also has a large field of view of the projection range and high imaging clarity.

[0068] Further, as shown in Figure 2 , the illumination system 2 specifically comprises a light source 20, a collimating lens group 21, a light homogenizing device 22, an integrating lens group 23, a prism 24 and a protective glass 25.

[0069] The light source 20 is configured to emit light rays. Optionally, the light source 20 can be an LED light source, a semiconductor laser light source, etc., with a color temperature of 4300K-6000K and a color of white, yellow, red, etc. The semiconductor laser light source can be RGB three-color synthetic white light, or blue laser excitation yellow fluorescent conversion device synthetic white light. The LED light source can be an LED chip integrated white light source. The light beam divergence angle of the light source 20 is ±60°, which can provide a high-brightness light source.

[0070] The collimating lens group 21 is arranged on the exit light path of the light source 20, and is configured to collimate the light rays emitted by the light source 20, so that the collimated light rays are incident on the light homogenizing device 22 in parallel. Specifically, the focal length of the collimating lens group 21 satisfies the relationship:

[0071]

[0072] wherein, represents the focal length of the collimating lens group 21; represents the effective aperture of the collimating lens group 21.

[0073] Further, the focal length of the collimating lens group 21 has a value range of , and for example, the focal length of the collimating lens group 21 can be 3mm, 3.5mm, 4mm, 4.5mm, 5mm or 5.5mm. The effective aperture of the collimating lens group 21 has a value range of For example, the effective aperture can be 10 mm, 13 mm, 16 mm, 19 mm or 21 mm. The collimated light rays emitted by the collimating lens group 21 have a divergence angle less than or equal to 10°; for example, the divergence angle of the collimated light rays can be 2°, 4°, 6°, 8°.

[0074] In a specific example of the present application, as shown in Figure 2 The collimating lens group 21 includes a first collimating lens 211 and a second collimating lens 212, through which the light rays emitted by the light source 20 are collimated to within 10°. Both the first collimating lens 211 and the second collimating lens 212 are plano-convex aspherical lenses made of glass, which have high collimation and can withstand the heat emitted by the light source 20, preventing damage due to heat.

[0075] Further, the diameter of the first collimating lens 211 is 12 mm, and the diameter of the second collimating lens 212 is 20 mm, which is conducive to the miniaturization of the illumination system 2.

[0076] The light homogenizing device 22 is disposed on the exit light path of the collimating lens group 21, and is used to divide the light rays emitted by the collimating lens group 21 into multiple fine light beams. Optionally, the light homogenizing device 22 can be a square rod, a compound eye, a diffractive optical element, a superlens, or other optical devices that can make the light spot uniform.

[0077] As a preferred embodiment, the light homogenizing device 22 is a compound eye lens. Specifically, the radius of curvature of each individual lenslet in the compound eye lens is:

[0078]

[0079] wherein, represents the radius of curvature of each individual lenslet in the compound eye lens; represents the refractive index of the compound eye lens; represents the thickness of the compound eye lens.

[0080] The length of each individual lenslet in the compound eye lens is:

[0081]

[0082] wherein, represents the length of each individual lenslet in the compound eye lens; represents the image height; represents the image aperture angle; represents the number of lenslets in the compound eye lens.

[0083] The integrating lens group 23 is disposed on the exit light path of the light homogenizing device 22, and is used to converge the multiple fine light beams emitted by the light homogenizing device 22 to the spatial light modulator 3. Specifically, the focal length of the integrating lens group 23 satisfies the relationship:

[0084]

[0085] wherein, denotes the focal length of the integral lens group 23; denotes the spot aperture of the homogenization device 22; denotes the beam aperture angle of the spatial light modulator 3.

[0086] Further, in some embodiments of the present application, the focal length of the integral lens group 23 ranges from 35mm to 42mm. For example, the focal length of the integral lens group 23 can be 35mm, 37mm, 39mm or 42mm.

[0087] Further, the integral lens group 23 is a right-anagled total internal reflection (RTIR) prism, the air gap of the right-anagled total internal reflection prism is located in the illumination light path, and the prism in the projection light path is equivalent to a flat glass, which can reduce the imaging aberration of the subsequent lens 1, at the same time, the illumination light path is in the same horizontal direction, which simplifies the illumination design and improves the light efficiency.

[0088] In a specific example of the present application, as shown in Figure 2 , the integral lens group 23 includes a first relay lens 231 and a second relay lens 232, which collects a plurality of fine light beams emitted by the homogenization device 22 and converges them to pass through the prism 24 and the protective glass 25 to the spatial light modulator 3, wherein the prism 24 is used to separate the light paths of the illumination system 2 and the lens 1.

[0089] Specifically, the energy utilization rate of the illumination system 2 provided by the embodiments of the present application is 96%, and the uniformity of illumination is 65%.

[0090] The embodiments of the present application also provide a light communication system, which includes the communication projection car lamp, and the vehicle communication is realized by controlling the communication projection car lamp to emit the visible light communication signal.

[0091] The lens 1 provided by the present application will be described in more detail through a specific example below, but it should be understood that the following embodiments are only for explaining and illustrating the technical solutions, and do not limit the scope of the present application.

[0092] The present embodiment provides a communication projection car lamp, as Figure 1 and Figure 2As shown, the communication projection car lamp comprises a lens 1, an illumination system 2 and a spatial light modulator 3. The illumination system 2 comprises a light source 20, a collimating lens group 21, a homogenization device 22 and an integrating lens group 23; the lens 1 comprises, coaxially arranged in sequence from the object side to the image side of the spatial light modulator 3 along the optical axis, a first positive lens 10, a first negative lens 11, a second positive lens 12, a second negative lens 13, a third positive lens 14, a diaphragm 15, a fourth positive lens 16, a third negative lens 17, a fifth positive lens 18 and a sixth positive lens 19.

[0093] The collimating lens group 21 comprises a first collimating lens 211 and a second collimating lens 212, both of which are plano-convex aspherical glass lenses, the diameter of the first collimating lens 211 is 12 mm, and the diameter of the second collimating lens 212 is 20 mm.

[0094] The focal length of the collimating lens group 21 is 4 mm, and the effective aperture is 16 mm.

[0095] The homogenization device 22 adopts an ommatidium lens, and the related parameters of the ommatidium lens are shown in Table 1:

[0096] Table 1

[0097] Optical parameters Numerical values Individual lenslet size (mm) 2.18×1.09 Curvature radius (mm) 3.69 Number 9×17 Length (mm) 10 Material PC

[0098] The integrating lens group 23 is a right-angle total internal reflection prism, which comprises a first relay lens 231 and a second relay lens 232. The focal length of the integrating lens group 23 is 38 mm.

[0099] The spatial light modulator 3 selects a vehicle-grade chip DLP6631-Q1, the light modulation area of which is rectangular, the modulation area size is 12.447 mm*6.226 mm, the pixel size is 7.6 μm, and ±12° flipping can be realized.

[0100] The lens 1 covers two driving road widths of about 5.6 m, assuming that the transverse size of the illumination beam at 5 m in front of the communication projection car lamp is consistent with the road, due to the axial symmetry of the optical system, the ratio of the longitudinal size to the transverse size of the illumination beam at 5 m is equal to the ratio of the longitudinal size to the transverse size of the spatial light modulator 3, the diagonal size of the vehicle-grade chip DLP6631-Q1 is 0.55 inches, and the width-height ratio is 2:1, so the longitudinal size is 2.8 m, therefore, the focal length f of the lens 1 can be determined as:

[0101]

[0102] wherein, represents the image height before zooming; represents the image height after zooming, represents the projection distance.

[0103] Field of view of lens 1 is:

[0104]

[0105] Specific optical parameters of lens 1 are shown in Table 2:

[0106] Table 2

[0107] (Surface) Curvature radius (mm) Center thickness (mm) Refractive index (Nd) Abbe number (Vd) Surface shape Object surface Infinite Infinite 1 56.267 4.05 1.90 37.1 Spherical 2 321.443 0.2 Spherical 3 28.42 2.96 1.82 46.6 Spherical 4 8.097 4.06 Spherical 5 28.859 4.71 1.96 17.5 Spherical 6 -25.9 5.61 1.75 52.3 Spherical 7 7.907 2.82 Spherical 8 21.479 5.99 1.50 66.0 Spherical 9 -8.6 0.08 Spherical 10 Infinite 4.33 Spherical 11 -68.445 6.05 1.73 54.7 Spherical 12 -9.535 3.61 1.95 17.9 Spherical 13 43.66 1.07 Spherical 14 -299.159 6.0 1.59 68.3 Spherical 15 -16.476 0.21 Spherical 16 48.2 5.96 1.96 17.5 Spherical 17 -39.515 1.36 Spherical 18 Infinite 25.4 1.52 64.2 Plane 19 Infinite 2.000 Plane 20 Infinite 1.100 1.52 64.2 Plane 21 Infinite 0.510 Plane 22 Infinite Spatial light modulator image surface

[0108] Referring to Figure 3 , Figure 3 , the spot diagram of each field of view of lens 1 provided by the embodiment in the visible light band is shown; wherein, Figure 3 (a) in FIG. 1 is the spot diagram of the first field of view of lens 1 in the visible light band, Figure 3 (b) in FIG. 1 is the spot diagram of the second field of view of lens 1 in the visible light band, Figure 3 (c) in FIG. 1 is the spot diagram of the third field of view of lens 1 in the visible light band, Figure 3 (d) in FIG. 1 is the spot diagram of the fourth field of view of lens 1 in the visible light band, Figure 3 (e) in FIG. 1 is the spot diagram of the fifth field of view of lens 1 in the visible light band, Figure 3 (f) in FIG. 1 is the spot diagram of the sixth field of view of lens 1 in the visible light band, and OBJ represents the object and IMA represents the image.

[0109] The spot diagram of lens 1 in each field of view in the visible light band is the light spot formed when the light rays intersect the image plane under each field of view, and the size of the light spot is calculated with reference to the chief ray, which is divided into root mean square (RMS) radius and geometric (GEO) radius. Among them, the RMS radius is first calculated as the root mean square of the distance between each light ray and the chief ray, and then the square root of each root mean square is calculated; and the GEO radius is the distance from the chief ray to the light ray farthest away. Since the RMS radius depends on each light ray, in the embodiment, the RMS radius is taken as the reference, and the more concentrated the light spot is, the higher the imaging quality of lens 1 is.

[0110] Specifically, according to the spot diagram shown in Figure 3 , it is calculated that the first field of view of lens 1 provided by the embodiment has a RMS radius of 2.885 μm, the second field of view has a RMS radius of 5.542 μm, the third field of view has a RMS radius of 7.407 μm, the fourth field of view has a RMS radius of 8.677 μm, the fifth field of view has a RMS radius of 10.796 μm, and the sixth field of view has a RMS radius of 14.438 μm. It can be seen that all the light rays fall into the pixel micro-mirror of the spatial light modulator 3, indicating that the spatial light modulator 3 can control all the light rays under the field of view.

[0111] Referring to Figure 4 ,Figure 4 The modulation transfer function (MTF) curve of the lens 1 provided in the embodiment is shown in the figure, the vertical coordinate is the modulation transfer function value, and the horizontal coordinate is the spatial frequency in cycles per mm. 0.00 (deg)-Tangential, 9.60 (deg)-Tangential, 16.00 (deg)-Tangential, 22.40 (deg)-Tangential, 27.20 (deg)-Tangential and 32.00 (deg)-Tangential represent 0-degree meridian, 9.6-degree meridian, 16-degree meridian, 22.4-degree meridian, 27.2-degree meridian and 32-degree meridian respectively. 0.00 (deg)-Sagittal, 9.60 (deg)-Sagittal, 16.00 (deg)-Sagittal, 22.40 (deg)-Sagittal, 27.20 (deg)-Sagittal and 32.00 (deg)-Sagittal represent 0-degree sagittal, 9.6-degree sagittal, 16-degree sagittal, 22.4-degree sagittal, 27.2-degree sagittal and 32-degree sagittal respectively. The MTF curve represents the relationship between the modulation degree and the logarithm of the line per mm in the image, and is used to evaluate the restoration ability of the lens 1 to the details of the scene.

[0112] Since the resolution of the communication projection vehicle lamp is determined by the resolution of the spatial light modulator 3 and the lens 1, the resolution of the lens 1 needs to match the resolution of the spatial light modulator 3. In the embodiment, the pixel size of the spatial light modulator 3 is 7.6 μm, and according to the resolution calculation formula, the resolution of the spatial light modulator 3 is 1 / (2*0.0076 mm)=661 p / mm. According to the general design standard, the MTF function of the lens 1 is greater than 0.4 at the cut-off frequency 661 p / mm, that is, the lens 1 has a resolution of 661 p / mm. Figure 4 It can be seen from the above that the lens 1 provided in the embodiment meets this design standard and has high definition.

[0113] Please refer to Figure 5 , Figure 5 The field curvature and distortion curve of the lens 1 provided in the embodiment is shown in the figure, wherein, Figure 5 (a) in the figure is the field curvature curve of the lens 1, the vertical coordinate is the field size, and the horizontal coordinate is the field curvature size. Figure 5(b) is the distortion curve of projection lens 43. The vertical axis represents the field of view and the horizontal axis represents the distortion percentage. 0.6563-Tangential, 0.5876-Tangential and 0.4861-Tangential represent the meridians with wavelengths of 0.6563, 0.5876 and 0.4861, respectively. 0.6563-Sagittal, 0.5876-Sagittal and 0.4861-Sagittal represent the sagittals with wavelengths of 0.6563, 0.5876 and 0.4861, respectively.

[0114] Field curvature refers to the bending of the image field, used to indicate the degree of non-coincidence between the focal point of the entire beam in an optical component and the ideal image point. Distortion refers to the aberration that different parts of an object have different magnifications when the object is imaged through an optical component. Distortion will cause the similarity between the object and the image to deteriorate, but it does not affect the sharpness of the image. In general optical systems, as long as the image deformation caused by distortion is not perceptible to the human eye, that is, the distortion value is less than 5%.

[0115] from Figure 5 As can be seen from the data, the field curvature of lens 1 provided in this embodiment is within the range of ±0.1, and the distortion value is less than 2.5%, indicating that lens 1 provided in this embodiment meets the visual requirements of the human eye.

[0116] Please see Figure 6 , Figure 6 The diagram shown is a transverse chromatic aberration diagram of lens 1 provided in this embodiment. The vertical axis represents the normalized pupil coordinates, and the horizontal axis represents the chromatic aberration value. 0.656, 0.588, and 0.486 represent the wavelength of light. Transverse chromatic aberration refers to the color difference around the image caused by the different magnification of different colors of light, resulting in image blurring. Figure 6 As can be seen from the image, the vertical chromatic difference value of lens 1 provided in this embodiment is within one pixel, indicating that the vertical chromatic difference value of lens 1 is small, thus ensuring image clarity.

[0117] Please see Figure 7 , Figure 7 The figure shows the relative illuminance diagram of lens 1 provided in this embodiment. The horizontal axis represents the relative illuminance, and the vertical axis represents the vertical field of view. As can be seen from the figure, this embodiment uses a large illumination design with an F-number of 2.2 to ensure that the light source 20 can illuminate evenly. Therefore, the illuminance distribution decreases by 10% from the center field of view to the edge field of view, indicating that the illuminance distribution of lens 1 provided in this embodiment is relatively uniform.

[0118] The lens provided in the application has a large field of view, low aberration and high resolution, and a communication projection vehicle lamp designed based on the lens can realize a large field of view of an illumination area, expand a communication visual range, avoid a road illumination communication blind area, and simultaneously realize road information projection, pedestrian identification information projection, speed limit and road sign projection functions, and has high projection image definition. In addition, the communication projection vehicle lamp combines visible light communication technology and digital projection technology, modulates a light beam by using a spatial light modulator, controls a visible light illumination area, so that a vehicle can perform selective light communication within a road illumination visual range, and the information interaction safety in the communication process is enhanced.

[0119] Obviously, the above embodiments are only examples for clearly illustrating the application, and are not intended to limit the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments cannot be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the application.

Claims

1. A lens, characterized in that, It includes a first positive lens, a first negative lens, a second positive lens, a second negative lens, a third positive lens, an aperture stop, a fourth positive lens, a third negative lens, a fifth positive lens, and a sixth positive lens arranged coaxially along the optical axis from the object side to the image side; The object-side surfaces of the first positive lens, the first negative lens, the second positive lens, the third positive lens, and the sixth positive lens are all convex; the object-side surfaces of the second negative lens, the fourth positive lens, the third negative lens, and the fifth positive lens are all concave. The image-side surfaces of the second positive lens, the fourth positive lens, and the fifth positive lens are all convex; the image-side surfaces of the second negative lens and the third negative lens are all concave.

2. The lens according to claim 1, characterized in that, The second positive lens and the second negative lens are cemented together to form a composite; and / or The fourth positive lens and the third negative lens are cemented together to form a composite.

3. The lens according to claim 1, characterized in that, The first positive lens, the second positive lens, and the sixth positive lens all have an optical refractive index greater than 1.9 and an optical Abbe number greater than 17.5; and / or The third, fourth, and fifth positive lenses all have an optical refractive index greater than 1.5 and an optical Abbe number greater than 66; and / or The first negative lens, the second negative lens, and the third negative lens all have an optical refractive index greater than 1.75 and an optical Abbe number greater than 17.

9.

4. The lens according to claim 1, characterized in that, The range of the ratio of the focal length to the effective aperture of the third positive lens is as follows: .

5. The lens according to claim 1, characterized in that, The first positive lens, the first negative lens, the second positive lens, the second negative lens, the third positive lens, the fourth positive lens, the third negative lens, the fifth positive lens, and the sixth positive lens are all glass lenses.

6. The lens according to claim 1, characterized in that, The range of the half field of view of the lens is as follows: and / or The range of the ratio of the lens length to the focal length is: ; and / or The range of the ratio of the lens's back focal length to its focal length is: ; and / or The telecentric angle of the lens is less than 0.2°.

7. A communication projection vehicle light, characterized in that, include: Lighting system for projecting beams of light; A spatial light modulator for generating a modulation pattern based on a beam of light projected by the lighting system; The lens as described in any one of claims 1 to 6 is used to project the modulation pattern, thereby emitting a visible light communication signal.

8. The communication projection vehicle light according to claim 7, characterized in that, The lighting system includes: A light source, used to emit light; A collimating lens group is disposed in the outgoing light path of the light source to collimate the light emitted by the light source, so that the collimated light is incident parallel to the light homogenizing device. A light-diffusing device is disposed in the outgoing light path of the collimating lens group to divide the light emitted from the collimating lens group into multiple fine beams; An integrating lens group is disposed on the output light path of the homogenizing device to converge multiple fine light beams emitted by the homogenizing device to the spatial light modulator.

9. The communication projection vehicle light according to claim 8, characterized in that, The focal length of the collimating lens group ranges from 100 to 1000. The effective caliber range is: The collimating lens group produces a divergence angle of less than or equal to 10° after collimation; and / or The light-diffusing device is a compound eye lens; and / or The integrating lens group is a right-angle total internal reflection prism; and / or The focal length of the integrating lens group ranges from 100 to 1000. .

10. An optical communication system, characterized in that, Including the communication projection vehicle light as described in any one of claims 7 to 9.

Images