Vehicle-mounted projection lens assembly and projector
By adopting a combination of spherical and aspherical lenses in the on-board projection lens assembly, the lens group structure is optimized, and the problems of uncompact structure and insufficient magnification in the prior art are solved, and smaller volume, larger projection area and more Low cost effect, suitable for loading vehicles and providing multiple projection functions.
Patent Information
- Application Number
- CN202421295488.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-06
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2034-06-06
AI Technical Summary
The existing on-board projection lens components are not compact enough, and the magnification is not high, which cannot meet the requirements of most vehicle manufacturers, making it difficult to effectively ensure the use effect.
Design an on-board projection lens assembly, using a combination of spherical lenses and aspherical lenses, optimize the structure of the lens group, make it smaller in size, larger in projection area, and reduce production costs. Specifically, it includes a chip, a protective lens, a prism, a lens group and a reflector. The light-input surface and light-out surface of the first lens in the lens group are both spherical, and the light-input surface of the sixth lens are both aspherical. Arrange in sequence along the direction of light propagation to optimize light propagation and system aberration.
It achieves a smaller size and a larger projection area, while reducing production costs, and has a simpler and more compact structure, suitable for vehicle loading, and can project super large and clear pictures in a short distance, meeting the needs of multiple projection functions.
Smart Images
Figure CN222337450U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to a vehicle lamp, and in particular, to a vehicle-mounted projection lens assembly. In addition, the present application also relates to a projector. Background Art
[0002] In recent years, automotive lighting systems have undergone tremendous changes. Dynamic ground projection technology, which can display any pattern within the same module, reshapes consumers' perception of exterior lighting by providing new and innovative lighting functions. Innovative lighting functions include automotive light carpets that illuminate the surrounding area outside the car or project vehicle information from the side mirrors, such as EV (electron volt) power level and remaining range, tire pressure warnings, traffic warnings, turn indicators, check engine light warnings, gas level / mileage, etc. Ground lighting also has other enhanced functions that help the car communicate with the driver and pedestrians, including welcome, corner lighting, reversing lighting, vehicle customization and parking indicators.
[0003] The existing projectors have a lens group formed by a large number of lenses, and the structure is not compact enough, and the magnification is not high, which cannot meet the requirements of most vehicle manufacturers.
[0004] Based on the above reasons, it is difficult for the existing technology to effectively ensure the use effect of the vehicle-mounted projection lens assembly. Utility Model Content
[0005] The problem to be solved in the first aspect of the present application is to provide a vehicle-mounted projection lens assembly, which sets one or more lenses in the lens group as spherical lenses and / or aspherical lenses, thereby making it smaller in size, larger in projection area, and lower in production cost.
[0006] The problem to be solved in the second aspect of the present application is to provide a projector with a simple structure, a smaller volume, a larger projection area, and a lower production cost.
[0007] In order to solve the above technical problems, the first aspect of the present application provides a vehicle-mounted projection lens assembly, including a chip, a protective lens, a prism, a lens group and a reflector, the lens group including a first lens and a sixth lens, the light incident surface and the light exit surface of the first lens are both formed as spherical surfaces, and the light incident surface and the light exit surface of the sixth lens are both formed as aspherical surfaces.
[0008] Preferably, the lens group further includes a second lens, a third lens, a fourth lens, a fifth lens and a seventh lens, the second lens, the third lens, the fourth lens and the fifth lens are arranged in sequence along the light propagation direction and are located between the first lens and the sixth lens, and the seventh lens is arranged between the sixth lens and the reflector.
[0009] Preferably, the light incident surfaces and light exit surfaces of the second lens, the third lens, the fourth lens and the fifth lens are all formed into spherical surfaces.
[0010] Preferably, the light incident surface and the light exit surface of the seventh lens are both formed as aspherical surfaces.
[0011] Preferably, the second lens is a cemented lens.
[0012] Preferably, the chip is a DMD chip.
[0013] Preferably, a stop is provided between the third lens and the fourth lens.
[0014] Preferably, the protective lens is a glass plane mirror, a PP plane mirror or a PMMA plane mirror.
[0015] Preferably, the reflective surface of the reflector is formed as an even-order aspherical reflective surface.
[0016] A second aspect of the present application further provides a projector, comprising a vehicle-mounted projection lens assembly according to any one of the technical solutions of the first aspect.
[0017] The vehicle-mounted projection lens assembly of the present application has the following advantages:
[0018] The vehicle-mounted projection lens assembly of the present application includes a chip, a protective lens, a prism, a lens group and a reflector. The lens group includes a first lens and a sixth lens. The light entrance surface and the light exit surface of the first lens are both set to be spherical surfaces, and the light entrance surface and the light exit surface of the sixth lens are both set to be aspherical surfaces. This can make the vehicle-mounted projection lens assembly of the present application smaller in size and at the same time have a larger projection area.
[0019] Other advantages of the present application and the technical effects of the preferred embodiments will be further described in the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 is a structural schematic diagram of a specific embodiment of the vehicle-mounted projection lens assembly of the present application;
[0021] Figure 2 is a graph of field curvature and distortion of the present application;
[0022] Figure 3 is a geometric transfer function curve of the present application at 0.1 lp / mm;
[0023] Figure 4 It is a spot diagram of this application.
[0024] Description of Reference Numerals
[0025] 1 chip 2 protective lenses
[0026] 3 prisms 4 lens groups
[0027] 401 first lens 402 second lens
[0028] 403 third lens 404 fourth lens
[0029] 405 fifth lens 406 sixth lens
[0030] 407 seventh lens 5 reflector
[0031] 6 aperture DETAILED DESCRIPTION
[0032] The specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation methods described here are only used to illustrate and explain the present application, and the protection scope of the present application is not limited to the specific implementation methods described below.
[0033] In the description of this application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0034] like Figures 1 to 4 As shown, the first aspect of the present application provides a vehicle-mounted projection lens assembly, including a chip 1, a protective lens 2, a prism 3, a lens group 4 and a reflector 5, the lens group 4 includes a first lens 401 and a sixth lens 406, the light incident surface and the light exit surface of the first lens 401 are both formed as spherical surfaces, and the light incident surface and the light exit surface of the sixth lens 406 are both formed as aspherical surfaces.
[0035] In the present application, the lens group 4 includes a plurality of lenses, each of which is arranged in sequence along the light propagation direction. The lens group 4 can achieve optimization of light and optimization of system aberrations. Among them, the light incident surface and the light exit surface of the first lens 401 are both formed as spherical surfaces, and the light incident surface and the light exit surface of the sixth lens 406 are both formed as aspherical surfaces. The surface parameters of the first lens 401 and the sixth lens 406 can be referred to Table 1.
[0036] Table 1 Surface parameters of each lens in the lens group
[0037]
[0038]
[0039] Taking the first lens 401 as an example, 401-1 represents the light incident surface, 401-2 represents the light exit surface, and the same applies to other lenses.
[0040] In Table 1, the curvature radius r of the light incident surface of the first lens 401 is 85.3±0.5 mm, and the curvature radius r of the light emitting surface is -16.8±0.5 mm; the thickness of the light incident surface is 3.8±0.5 mm, and the thickness of the light emitting surface is 1.9±0.5 mm;
[0041] The second lens 402 is a cemented lens, the curvature radius r of the light incident surface is -7.9±0.5mm, the curvature radius r of the light emitting surface is -14.7±0.5mm; the thickness of the light incident surface is 1.1±0.5mm, and the thickness of the light emitting surface is 0.4±0.3mm;
[0042] The curvature radius r of the light incident surface of the third lens 403 is 18.7±0.5 mm, and the curvature radius r of the light emitting surface is -1257.848±0.5 mm; the thickness of the light incident surface is 6.4±0.5 mm, and the thickness of the light emitting surface is 15.3±0.5 mm;
[0043] The curvature radius r of the light incident surface of the fourth lens 404 is 23.2±0.5 mm, and the curvature radius r of the light emitting surface is 74.5±0.5 mm; the thickness of the light incident surface is 4.0±0.5 mm, and the thickness of the light emitting surface is 12.5±0.5 mm;
[0044] The curvature radius r of the light incident surface of the fifth lens 405 is 14.0±0.5 mm, and the curvature radius r of the light emitting surface is 53.9±0.5 mm; the thickness of the light incident surface is 3.7±0.5 mm, and the thickness of the light emitting surface is 0.6±0.5 mm;
[0045] The curvature radius r of the light incident surface of the sixth lens 406 is 8.7±0.5 mm, and the curvature radius r of the light emitting surface is 4.9±0.5 mm; the thickness of the light incident surface is 4.0±0.5 mm, and the thickness of the light emitting surface is 23.0±0.5 mm;
[0046] The curvature radius r of the light incident surface of the seventh lens 407 is 6.1±0.5 mm, and the curvature radius r of the light emitting surface is 8.9±0.5 mm; the thickness of the light incident surface is 3.0±0.5 mm, and the thickness of the light emitting surface is 244±1 mm.
[0047] The thickness of the light incident surface of the protective lens 2 is 1.1±0.5mm, and the thickness of the light emitting surface is 0.39±0.3mm;
[0048] The thickness of the light incident surface of the prism 3 is 13.0±0.5 mm, and the thickness of the light emitting surface is 1±0.5 mm.
[0049] It should be noted that the projection ratio of the projector is one of the important parameters of the projection system. The ratio of the projection distance of the projection system to the width of the screen is called the projection ratio. The projection ratio of the projection system is usually between 1.5-1.9. When the projection ratio is less than 1, it is called a short-throw lens. When the projection ratio is less than 0.6, we usually call it an ultra-short-throw lens. In short, ultra-short-throw means achieving large-format projection at a short distance.
[0050] As a preferred embodiment of the present application, the lens group 4 also includes a second lens 402, a third lens 403, a fourth lens 404, a fifth lens 405 and a seventh lens 407. The second lens 402, the third lens 403, the fourth lens 404 and the fifth lens 405 are arranged in sequence along the light propagation direction and are located between the first lens 401 and the sixth lens 406. The seventh lens 407 is arranged between the sixth lens 406 and the reflector 5.
[0051] In a preferred embodiment of the present application, the lens group 4 includes a first lens 401, a second lens 402, a third lens 403, a fourth lens 404, a fifth lens 405, a sixth lens 406 and a seventh lens 407, wherein the first lens 401 is a spherical lens and the sixth lens 406 is an aspherical lens, so that the volume of the present application can be smaller and the projection area can be larger.
[0052] As a preferred embodiment of the present application, the light incident surfaces and the light exit surfaces of the second lens 402 , the third lens 403 , the fourth lens 404 , and the fifth lens 405 are all formed into spherical surfaces.
[0053] As a preferred embodiment of the present application, the light incident surface and the light emitting surface of the seventh lens 407 are both formed as aspherical surfaces.
[0054] In a preferred embodiment of the present application, the sixth lens 406 and the seventh lens 407 are both formed as aspherical lenses, and the aspherical coefficients are shown in Table 2.
[0055] Table 2 Coefficients of the aspheric surfaces in the sixth lens, the seventh lens and the reflecting mirror
[0056]
[0057]
[0058] In Table 2, E-04 means 10^-4, E-05 means 10^-5, and so on.
[0059] As a preferred embodiment of the present application, the second lens 402 is a cemented lens.
[0060] As a preferred embodiment of the present application, the chip 1 is a DMD (Digital Micromirror Device) chip.
[0061] In a preferred embodiment of the present application, chip 1 is a DMD chip invented by Texas Instruments (TI) of the United States. It is composed of many small aluminum reflective mirrors, each of which is called a pixel. The imaging pattern and its characteristics are determined by controlling the rotation of the micro-mirror around a fixed axis and the time domain response (determining the reflection angle and stagnation time of the light). In the design, the object height, NA and MTF (Modulation Transfer Function) line pairs of the system are determined according to the parameters of the DMD. NA indicates that the CPU does not support the Northbridge function.
[0062] As a preferred embodiment of the present application, a stop 6 is further provided between the third lens 403 and the fourth lens 404 .
[0063] As a preferred embodiment of the present application, the protective lens 2 is a glass plane mirror, a PP (polypropylene) plane mirror or a PMMA (polymethyl methacrylate) plane mirror.
[0064] In a preferred embodiment of the present application, the protective lens 2 is a glass plane mirror, and its main function is to protect the chip 1. Specifically, the protective lens 2 covers the chip 1, and optical path calculation needs to be introduced during design.
[0065] In a preferred embodiment of the present application, the prism 3 is preferably an equivalent transformation of a TIR (Total Internal Reflection) prism in an illumination system of a projection system, and is used for optical path matching of the system.
[0066] As a preferred embodiment of the present application, the reflecting surface of the reflecting mirror 5 is formed as an even-order aspherical reflecting surface.
[0067] In a preferred embodiment of the present application, the reflective surface of the reflector 5 is preferably an aspherical reflective surface. The reflector 5 can change the propagation direction of light, so as to reasonably utilize space and help the system achieve a larger image within a limited distance.
[0068] In a preferred embodiment of the present application, a plane reflector is added between the seventh lens 407 and the reflector 5. The plane reflector deflects the light path, further making the structure of the vehicle-mounted projection lens assembly of the present application more compact.
[0069] In a preferred embodiment of the present application, the height Z in the optical axis direction can be calculated by the following formula:
[0070]
[0071] Among them, Z represents the height in the direction of the optical axis, that is, the sag; k represents the conic value, also known as the cone coefficient; c represents the surface curvature, r represents the radial coordinate expressed in lens units, and a represents the aspheric coefficient.
[0072] In a preferred embodiment of the present application, a chip 1, a protective lens 2, a prism 3, a lens group 4, a reflector 5 and an aperture 6 are included. The lens group 4 includes a first lens 401, a second lens 402, a third lens 403, a fourth lens 404, a fifth lens 405, a sixth lens 406 and a seventh lens 407 in sequence along the light propagation direction. The light incident surface and the light exit surface of the first lens 401 are both formed into spherical surfaces, and the light incident surface and the light exit surface of the sixth lens 406 are both formed into aspherical surfaces. The light incident surface and the light exit surface of the second lens 402, the third lens 403, the fourth lens 404 and the fifth lens 405 are all formed as spherical surfaces, the light incident surface and the light exit surface of the seventh lens 407 are all formed as aspherical surfaces, the second lens 402 is a cemented lens, the chip 1 is a DMD chip, the aperture 6 is arranged between the third lens 403 and the fourth lens 404, the protective lens 2 is a glass plane mirror covering the chip 1, the prism 3 is a TIR prism, and the reflecting surface of the reflector 5 is an aspherical reflecting surface. In the most preferred embodiment, due to the adoption of the above-mentioned structural form, and the light-entering surface and the light-emitting surface of the first lens 401 are both formed into a spherical surface type, and the light-entering surface and the light-emitting surface of the sixth lens 406 are both formed into a non-spherical surface type, the distortion of the vehicle-mounted projection lens assembly of the present application is less than 4%, and the projection screen size can reach 1200mm×680mm, the effective projection distance is 0.2m, the magnification is 179, the projection ratio is 0.2, and the total length is not more than 140mm. From the above data, it can be seen that the structure of the vehicle-mounted projection lens assembly of the present application is simpler and more compact, and there are no parts formed of special materials in the entire structure. The total length of the lens is much smaller than that of the prior art, and it is easier to install. After the optical optimization design, the present application can finally realize the function of projecting a super large and clear picture within a short distance, and the projection can be realized on the ground, on the wall, on the vehicle body, etc., thereby forming different projection functions.
[0073] A second aspect of the present application provides a projector, comprising a vehicle-mounted projection lens assembly according to any one of the above technical solutions.
[0074] The preferred embodiments of the present application are described in detail above in conjunction with the accompanying drawings; however, the present application is not limited to the specific details in the above embodiments. Within the technical concept of the present application, a variety of simple modifications can be made to the technical solution of the present application, and these simple modifications all fall within the protection scope of the present application.
[0075] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this application will not further describe various possible combinations.
[0076] In addition, the various implementation modes of the present application may be arbitrarily combined, and as long as they do not violate the concept of the present application, they should also be regarded as the contents disclosed in the present application.
Claims
1. A vehicle-mounted projection lens assembly, characterized in that: The invention comprises a chip (1), a protective lens (2), a prism (3), a lens group (4) and a reflector (5); the lens group (4) comprises a first lens (401) and a sixth lens (406); the light incident surface and the light exit surface of the first lens (401) are both formed into spherical surfaces, and the light incident surface and the light exit surface of the sixth lens (406) are both formed into aspherical surfaces.
2. The vehicle-mounted projection lens assembly according to claim 1, characterized in that: The lens group (4) further comprises a second lens (402), a third lens (403), a fourth lens (404), a fifth lens (405) and a seventh lens (407); the second lens (402), the third lens (403), the fourth lens (404) and the fifth lens (405) are arranged in sequence along the light propagation direction and are located between the first lens (401) and the sixth lens (406); the seventh lens (407) is arranged between the sixth lens (406) and the reflector (5).
3. The vehicle-mounted projection lens assembly according to claim 2, characterized in that: The light incident surfaces and light exit surfaces of the second lens (402), the third lens (403), the fourth lens (404) and the fifth lens (405) are all formed into spherical surfaces.
4. The vehicle-mounted projection lens assembly according to claim 2, characterized in that: The light incident surface and the light exit surface of the seventh lens (407) are both formed as aspherical surfaces.
5. The vehicle-mounted projection lens assembly according to claim 2, characterized in that: The second lens (402) is a cemented lens.
6. The vehicle-mounted projection lens assembly according to claim 1, characterized in that: The chip (1) is a DMD chip.
7. The vehicle-mounted projection lens assembly according to claim 2, characterized in that: A stop (6) is also provided between the third lens (403) and the fourth lens (404).
8. The vehicle-mounted projection lens assembly according to any one of claims 1 to 7, characterized in that: The protective lens (2) is a glass plane mirror, a PP plane mirror or a PMMA plane mirror.
9. The vehicle-mounted projection lens assembly according to any one of claims 1 to 7, characterized in that: The reflecting surface of the reflecting mirror (5) is formed as an even-order aspherical reflecting surface.
10. A projector, characterized in that: The invention comprises a vehicle-mounted projection lens assembly according to any one of claims 1 to 9.