Non-telecentric light path projection lens and vehicle lamp

Abstract

The application provides a non-telecentric light path projection lens and a vehicle lamp, and belongs to the technical field of vehicle lamps, comprising a front lens group A with negative focal length, an aperture diaphragm B and a rear lens group C with positive focal length which are sequentially arranged along the light path from the object side to the image side; the front lens group A comprises a biconvex resin aspherical positive lens, a negative meniscus glass lens, a biconcave glass lens and a glass positive lens, and the rear lens group C comprises a positive meniscus glass lens and a biconvex glass lens; the focal length of the front and rear lens groups satisfies 7.5<|fA / fC|<9.0, and the angle between the chief ray of the maximum field of view and the optical axis is 9.5°. The effective focal length of the lens is 39.2 mm, the F / # is 1.1, the image circle diameter is Φ13.97 mm, the total length is about 90 mm, stable imaging is achieved at-40℃~+85℃, the lens can be well matched with the non-telecentric illumination light path of the vehicle lamp, the light energy utilization rate is improved, and the lens is suitable for the narrow installation space of the vehicle lamp.

Description

Technical Field

[0001] This invention belongs to the field of automotive lighting technology, specifically relating to a non-telecentric optical path projection lens and automotive lighting. Background Technology

[0002] With the continuous advancement of technology, automotive lights, as one of the most important safety and appearance components of a car, are gradually becoming intelligent and digital, evolving from ordinary headlights to ADB / AFS headlights, and then to pixel-level digital projection headlights. Pixel-level automotive lighting is currently broadly divided into three levels: million-pixel, ten-thousand-pixel, and hundred-pixel and below. Million-pixel automotive lighting solutions include an illumination optics section responsible for illuminating the pixel chip, and a projection lens section that projects the chip's image to a distant, magnified location.

[0003] Illumination light paths can be classified into telecentric and non-telecentric types based on the direction of the principal ray. Due to limitations in the working angle of the micromirrors in the DMD chip and the structure of the lighting system, many megapixel automotive lights use non-telecentric light paths, where the principal ray forms a certain angle with the optical axis. If a traditional telecentric projection lens with a principal ray parallel to the optical axis is used to match it, the principal ray angles are easily mismatched, and part of the imaging beam is blocked by the aperture, which can easily reduce light energy utilization and decrease image illuminance.

[0004] Referring to Chinese patent document CN117233922A, entitled "A Method and Lens for Large Field-of-View Object-Side Telecentric Projection Imaging for Vehicle Lights," the method includes two large-aperture crescent-shaped lenses, a cemented doublet lens group, a negative crescent lens, an aperture stop, a cemented triplet lens group, and two biconvex lenses. The aperture stop is set on the object-side side of the cemented triplet lens. Light rays are imaged onto the DMD image plane through a TIR total internal reflection prism and a protective glass. This scheme achieves object-side telecentric imaging with a large field of view and high image clarity by coordinating positive and negative optical power and correcting chromatic aberration and spherical aberration through the cemented doublet group.

[0005] Referring to Chinese patent document CN117434684A entitled "An Optical Imaging Lens for High-Definition Projection Technology for Automotive Headlights", it discloses seven all-glass spherical lenses arranged sequentially from the image side to the object side, with the aperture stop placed between the image side and the first lens, and the positive and negative optical powers alternately distributed to ensure imaging clarity and illumination brightness under both near and far light conditions.

[0006] Referring to the above technical solutions: First, existing pixel-level automotive headlight projection lenses are generally designed with the object side telecentric, requiring the principal rays of each field of view to be parallel to the optical axis at the DMD end. However, due to the limitations of the working angle of the micromirrors in the DMD chip and the structure of the lighting system, the actual lighting optical path is mostly non-telecentric, with the principal ray of the lighting forming a certain angle with the optical axis. This can easily lead to a mismatch with the principal ray angle of the telecentric projection lens, causing some of the imaging beam to be blocked by the aperture diaphragm, which can easily reduce light energy utilization and decrease the illuminance at the edge of the image plane. Second, to correct aberrations under large relative apertures, existing solutions mostly use a seven-element or higher all-glass spherical structure. This results in a large number of elements, a large overall length, and high cost. Furthermore, it relies on a large number of adhesive surfaces, which can easily increase the stress risk at the adhesive interfaces. In high and low temperature environments, stress deformation is more likely to occur, affecting the stability of the imaging resolution and hindering the stable operation of the automotive headlight under all working conditions.

[0007] In view of this, there is a need for a projection lens for vehicle lights that matches the object-side principal ray angle with the non-telecentric lighting system, has high light energy utilization, low aberration and distortion, and good temperature range adaptability to solve the problems in the existing technology. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a non-telecentric optical path projection lens and vehicle lamp that can match the main ray angle of a non-telecentric lighting system, prevent the beam from being blocked by the aperture aperture, improve the light energy utilization rate and image surface illuminance uniformity, while reducing the number of lenses, controlling the structural size and production cost, and improving imaging stability in the entire temperature range.

[0009] To address the aforementioned technical problems, this invention provides a non-telecentric optical path projection lens, comprising a front lens group A with negative optical power, an aperture stop B, and a rear lens group C with positive optical power arranged sequentially from the object side to the image side along the optical path; the front lens group A includes a first lens, a second lens, a third lens, and a fourth lens arranged sequentially along the optical path, wherein the first lens is a positive lens, the second and third lenses are both negative lenses, and the fourth lens is a positive lens; the rear lens group C includes a fifth lens and a sixth lens arranged sequentially along the optical path, both of which are positive lenses; the focal length of the front lens group A is fA, and the focal length of the rear lens group C is fC, where fA and fC satisfy: 7.5 < |fA / fC| < 9.0; the angle θ between the principal ray of the maximum field of view of the projection lens and the optical axis satisfies: 5° ≤ θ ≤ 15°.

[0010] By adopting the above technical solution, the object-side principal ray angle of the projection lens is matched with the principal ray angle of the non-telecentric illumination system. The imaging beams emitted from each field of view of the pixel chip can enter the aperture aperture, preventing beam interception loss by the telecentric lens and improving light energy utilization.

[0011] Optionally, the first lens is biconvex, with the object side being an even-order aspherical surface and the image side being a spherical surface, and the edge of the first lens is truncated to form a rectangular outer contour.

[0012] By adopting the above technical solutions, the difficulty of mold processing and mass production can be reduced. At the same time, it can be adapted to the compact layout structure inside the car headlights without taking up extra space in the vehicle body. Furthermore, the aspherical design can be used to optimize aberrations, ensuring the clarity of the projected image while controlling production costs, and meeting the precision requirements of the car headlights for pattern projection.

[0013] The second lens is a negative meniscus that curves towards the image side, the third lens is a double concave shape, the fourth lens is a double convex shape, the fifth lens is a positive meniscus that curves towards the object side, and the sixth lens is a double convex shape.

[0014] By adopting the above technical solutions and reasonably matching positive and negative optical powers, spherical aberration, chromatic aberration, and distortion can be effectively corrected.

[0015] The first lens is an optical resin lens with a refractive index of 1.53 to 1.54; the second lens is a glass lens with a refractive index of 1.94 to 1.95; the third lens is a glass lens with a refractive index of 1.84 to 1.85; the fourth lens is a glass lens with a refractive index of 1.80 to 1.81; the fifth lens is a glass lens with a refractive index of 1.77 to 1.78; and the sixth lens is a glass lens with a refractive index of 1.70 to 1.74.

[0016] By adopting the above technical solution, high-refractive-index glass is used to bear the main optical power, which can reduce the number of lenses and the total length of the system, and help reduce chromatic aberration. At the same time, low-refractive-index optical resin and glass are used to achieve a reasonable distribution of different optical powers, which can meet the miniaturization design requirements of automotive headlight projection lenses and meet the installation requirements of automotive headlight modules in the narrow space of the vehicle's front compartment.

[0017] The surface radii of curvature R of each lens satisfy the following: For the first lens, the object-side radius R1 is +64.285~+64.485mm, and the image-side radius R2 is -474.009~-474.209mm; for the second lens, the object-side radius R3 is +23.913~+24.113mm, and the image-side radius R4 is +16.882~+17.082mm; for the third lens, the object-side radius R5 is -17.564~-17.764mm, and the image-side radius R6 is +157.329~+157. 529mm; the fourth lens has an object-side R7 of +168.897~+169.007mm and an image-side R8 of -29.767~-29.967mm; the fifth lens has an object-side R9 of -1840.198~-1840.398mm and an image-side R10 of -45.994~-46.194mm; the sixth lens has an object-side R11 of +51.3~+51.5mm and an image-side R12 of -449.496~-449.696mm.

[0018] The distance between the image side and the object side of the second lens is 0.175~0.195mm; the thickness of the second lens is 8.42~8.62mm, and the distance between its image side and the object side of the third lens is 15.01~15.03mm; the thickness of the third lens is 5.25~5.27mm, and the distance between its image side and the object side of the fourth lens is 0.14~0.16mm; the thickness of the fourth lens is 8.60~8.62mm, and the distance between its image side and the aperture stop is 0mm; the distance between the aperture stop and the object side of the fifth lens is 1.35~1.37mm; the thickness of the fifth lens is 5.88~5.90mm, and the distance between its image side and the object side of the sixth lens is 0.13~0.15mm; the thickness of the sixth lens is 5.60~5.62mm, and the distance between its image side and the image plane is 32.00~32.02mm.

[0019] The effective focal length f' of the projection lens is 39.2mm, the relative aperture F / # is 1.1, the total length of the optical system is 90mm, the image circle diameter is Φ13.97mm, and the back focal length is 32.0mm.

[0020] The angle θ between the principal ray of the maximum field of view in the projection lens and the optical axis is 9.5°; the optical distortion of the projection lens is -1.25%, and the absolute value of the optical distortion is less than 1.3%. By adopting the above technical solution, a definite non-telecentric matching angle and low distortion imaging can be achieved.

[0021] The projection lens is compatible with a 0.55-inch digital micromirror device (DMD), and maintains stable resolution and image focus within a full temperature range of -40℃ to +85℃.

[0022] By adopting the above technical solutions, stable imaging performance can be maintained within the commonly used operating temperature range of automotive lights, meeting the environmental adaptability requirements of optical components in automotive scenarios. The overall non-telecentric optical path design adapts to the projection needs of automotive lights, ensuring image clarity and size adaptability while controlling optical distortion, thus providing stable and reliable projection imaging effects for automotive lights.

[0023] The present invention also provides a vehicle headlight comprising a non-telecentric optical path projection lens as described in any of the above claims.

[0024] In summary, compared with the prior art, the present invention has at least one of the following beneficial technical effects: Please help me analyze the beneficial effects point by point, based on the issues mentioned in the background technology, the specific data described in the text, and the working principle: 1. This invention adopts a non-telecentric optical path design, controlling the angle θ between the principal ray of the maximum field of view and the optical axis to 5°~15°, matching the principal ray emission angle of the non-telecentric illumination system. This can prevent the problem of the imaging beam being blocked by the aperture aperture due to the mismatch between the principal ray angle of the traditional telecentric projection lens and the non-telecentric illumination optical path, thereby improving the light energy utilization rate, improving the problem of reduced illumination at the edge of the image plane, and enhancing the uniformity of illumination on the image plane.

[0025] 2. This invention uses 6 lenses, which reduces the number of lenses compared to the existing technology with 7 or more lenses, shortens the total length of the optical system to 90mm, adapts to the installation requirements of the vehicle headlight module in the narrow space of the vehicle's front compartment, and reduces material costs and manufacturing difficulty.

[0026] 3. This invention uses only one resin aspherical lens, eliminating the need for a cemented assembly of multiple lenses. This prevents the risk of cementing stress caused by a large number of cemented surfaces, reduces the possibility of lens stress deformation under high and low temperature environments, and ensures stable resolution and undefocused image plane within the full temperature range of -40℃ to +85℃, meeting the environmental adaptability requirements of automotive scenarios.

[0027] 4. By rationally allocating positive and negative optical power and combining high-refractive-index glass with low-refractive-index optical resin design, this invention can achieve good aberration correction with only six lenses. The final optical distortion is only -1.25%, and the absolute value of distortion is less than 1.3%. At the same time, it can be adapted to 0.55-inch DMD chips, which can meet the requirements of pixel-level digital projection headlights for image clarity and projection accuracy. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the optical system structure with light rays according to the present invention; Figure 2 This is a schematic diagram of the optical system structure of the present invention that does not carry light. Figure 3This is the MTF curve of the present invention at an ambient temperature of -40°C; Figure 4 This is the MTF curve of the present invention at an ambient temperature of +20°C; Figure 5 This is the MTF curve of the present invention at an ambient temperature of +85°C; Figure 6 This is a schematic diagram of the cut edge of the first lens of the present invention, wherein (a) is a schematic diagram of the shape of the first lens as viewed along the optical axis, the dashed line represents the circular outline before cutting, and the solid line represents the rectangular outer outline formed after cutting; (b) is a cross-sectional view along line AA.

[0029] Explanation of reference numerals in the attached diagram: 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Aperture stop; 6. Fifth lens; 7. Sixth lens; 8. Image plane. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will be described in conjunction with the embodiments of the present invention. Figures 1-6 The technical solutions of the embodiments of the present invention will be clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention are within the scope of protection of the present invention.

[0031] Reference Figure 1 and Figure 2 As shown, this embodiment provides a non-telecentric optical path projection lens, including a front lens group A, an aperture diaphragm B, a rear lens group C, and an image plane 8 arranged sequentially along the optical path from the object side to the image side.

[0032] The front lens group A has negative optical power and includes a first lens 1, a second lens 2, a third lens 3, and a fourth lens 4 arranged sequentially from the object side to the image side along the optical path. Among them, the first lens 1 is a resin aspherical positive lens with positive optical power, its object side is an even-order aspherical surface, its image side is a spherical surface, and its overall shape is biconvex. The edge of the first lens 1 is cut to form a rectangular outer contour. The second lens 2 is a glass negative meniscus lens with negative optical power that bends towards the image side. The third lens 3 is a glass biconcave lens with negative optical power. The fourth lens 4 is a glass biconvex lens with positive optical power.

[0033] The aperture stop 5 is positioned between the fourth lens 4 and the fifth lens 6, 0 mm from the image side of the fourth lens 4 and 1.35~1.37 mm from the object side of the fifth lens 6.

[0034] The rear lens group C has positive optical power and includes a fifth lens 6 and a sixth lens 7 arranged sequentially from the object side to the image side along the optical path; wherein, the fifth lens 6 is a positive meniscus lens of glass with positive optical power that bends toward the object side; and the sixth lens 7 is a biconvex lens of glass with positive optical power.

[0035] Image plane 8 (DMD) is located on the image side of the sixth lens 7, and is spaced 32.00~32.02mm from the image side of the sixth lens 7.

[0036] Reference Figure 2 The first lens 1 is an optical resin lens with a refractive index of 1.53~1.54; the second lens 2 is a glass lens with a refractive index of 1.94~1.95; the third lens 3 is a glass lens with a refractive index of 1.84~1.85; the fourth lens 4 is a glass lens with a refractive index of 1.80~1.81; the fifth lens 6 is a glass lens with a refractive index of 1.77~1.78; and the sixth lens 7 is a glass lens with a refractive index of 1.70~1.74.

[0037] The surface curvature radii R of each lens satisfy the following: for the first lens 1, the object-side R1 is +64.285~+64.485mm, and the image-side R2 is -474.009~-474.209mm; for the second lens 2, the object-side R3 is +23.913~+24.113mm, and the image-side R4 is +16.882~+17.082mm; for the third lens 3, the object-side R5 is -17.564~-17.764mm, and the image-side R6 is +157.329~+157. 529mm; the fourth lens 4 has an object-side R7 of +168.897~+169.007mm and an image-side R8 of -29.767~-29.967mm; the fifth lens 6 has an object-side R9 of -1840.198~-1840.398mm and an image-side R10 of -45.994~-46.194mm; the sixth lens 7 has an object-side R11 of +51.3~+51.5mm and an image-side R12 of -449.496~-449.696mm.

[0038] The center thickness t of each lens and the spacing d between adjacent surfaces satisfy the following conditions: Lens 1 has a thickness of 6.05~6.25mm, and the spacing between its image-side surface and the object-side surface of the second lens is 0.175~0.195mm; Lens 2 has a thickness of 8.42~8.62mm, and the spacing between its image-side surface and the object-side surface of the third lens is 15.01~15.03mm; Lens 3 has a thickness of 5.25~5.27mm, and the spacing between its image-side surface and the object-side surface of the fourth lens is 0.14~0.1mm. 6mm; the fourth lens 4 has a thickness of 8.60~8.62mm, and the distance from its image side to the aperture stop 5 is 0mm; the distance from the aperture stop 5 to the object side of the fifth lens is 1.35~1.37mm; the fifth lens 6 has a thickness of 5.88~5.90mm, and the distance from its image side to the object side of the sixth lens is 0.13~0.15mm; the sixth lens 7 has a thickness of 5.60~5.62mm, and the distance from its image side to the image plane is 32.00~32.02mm.

[0039] Reference Figure 2 The surface curvature radius R of each lens (where surface S1 corresponds to R1, S2 corresponds to R2, and so on), center thickness t, refractive index n, and spacing d between adjacent surfaces are shown in Table 1: Table 1

[0040] The focal length fA of the front lens group A and the focal length fC of the rear lens group C satisfy 7.5 < |fA / fC| < 9.0. Calculated according to the data in Table 1, fA ≈ -262mm, fC ≈ +31.1mm, and |fA / fC| ≈ 8.4. This conditional expression limits the ratio of the weak negative optical power of the front group to the positive optical power of the rear group, balancing the focal length distribution within a total length constraint of approximately 90mm, thus taking into account both aberration correction and structural compactness.

[0041] The performance parameters of this embodiment are: effective focal length f'=39.2mm, F / #=1.1, total optical system length approximately 90mm, image circle diameter Φ13.97mm, back focal length 32.0mm, maximum field of view principal ray angle θ=9.5° with optical axis, and optical distortion -1.25%.

[0042] The aperture stop 5 is 0 mm from the image side of the fourth lens 4 and 1.35~1.37 mm from the object side of the fifth lens 6. By configuring the negative optical power of the front lens group A and arranging the aperture stop and the rear group, the principal ray of the maximum field of view forms a 9.5° angle between the image side and the optical axis, thus achieving a non-telecentric optical path design.

[0043] In this embodiment, the materials that can be used for each lens are as follows: The first lens 1 can be made of ZEONEX E48R grade cyclic olefin polymer (COP) optical resin from Zeon Corporation of Japan, with a refractive index nd=1.531; The second lens 2 can be made of high refractive index and high dispersion flint optical glass of the German company Schott AG N-SF66, with a refractive index nd=1.923; The third lens 3 can be made of lanthanum flint optical glass of the German company Schott AG, grade N-LASF9, with a refractive index nd=1.850; The fourth lens 4 can be made of lanthanum flint optical glass of grade N-LASF44 from Schott AG, Germany, with a refractive index nd=1.804; The fifth lens 6 can be made of lanthanum crown glass of grade N-LAF34 from Schott AG, Germany, with a refractive index nd=1.773; The sixth lens 7 can be made of Schott AG N-LAK34 crown glass with a refractive index nd=1.729.

[0044] The materials for the lenses described above can also be equivalent grades from other manufacturers with similar performance. For example, A1 can be made of Mitsui Chemicals OKP series or other low birefringence cyclic olefin polymers; A2 can be made of Chengdu Guangming H-ZF62 series or Ohara S-NPH series high refractive index and high dispersion flint glass; A3 to C1 can be made of Guoguang / Chengdu Guangming H-LAF, H-LASF, and H-ZK series glasses with corresponding nd and dispersion; C2 can be made of Guoguang H-LAK52 or Schott N-LAK34 crown glass. All equivalent grades with refractive indices and Abbe numbers falling within the above-mentioned range of this invention are applicable.

[0045] Through the rational combination of high-refractive-index, high-dispersion flint glass (second and third lenses), low-dispersion crown glass (fifth and sixth lenses), and low-dispersion resin (first lens), the Abbe numbers of each lens form a complementary distribution, enabling the front group A and the rear group C to achieve a good overall achromatic effect. Figure 1 and Figure 2 The optical path structure shown can ensure full field-of-view imaging contrast even with a large aperture of F / 1.1.

[0046] Implementation Principle: The projection lens in this embodiment is used in conjunction with a 0.55-inch DMD (approximately 13.97mm diagonal, 1152×1152 resolution). The DMD is illuminated at a certain angle by a non-telecentric illumination system, and the imaging principal ray emitted from the DMD forms a certain angle with the optical axis. This lens is designed with a maximum field of view principal ray angle of 9.5°, so that the direction of the principal ray on the object side (DMD end) of the lens is consistent with the direction of the principal ray of the illumination system. The imaging beams of each field of view can completely enter the aperture stop 5, preventing the principal ray mismatch and interception loss of the telecentric lens, thereby improving the light energy utilization rate.

[0047] The standard equation for the even-order aspherical sagitta of the surface S1 of the first lens 1 is:

[0048] In the formula, C is the vertex curvature (C=1 / R1, the reciprocal of the radius R), h is the radial coordinate in lens length units, K is the conic coefficient (the conic coefficient is less than -1 for hyperbolas, -1 for parabolas, between -1 and 0 for ellipses, and 0 for spheres), and A1~A6 represent the coefficients corresponding to each radial coordinate.

[0049] The parameters corresponding to the sagittal height of the object-side surface S1 of the first lens 1 are shown in Table 2: Table 2

[0050] Reference Figure 3 , Figure 4 and Figure 5 The MTF curves of this embodiment at -40℃, +20℃, and +85℃ represent the optical transfer function modulation contrast at different spatial frequencies in each field of view. As can be seen from the figure, when the spatial frequency reaches 32 lp / mm per line pair, the MTF value of the entire temperature range and field of view is close to the diffraction limit. The MTF curves at different temperatures are consistent, indicating that this projection lens can maintain excellent imaging resolution in the entire operating temperature range of -40℃ to +85℃, and will not have problems such as image plane defocusing or decreased imaging clarity caused by temperature changes. It can meet the environmental stability requirements of vehicle lights.

[0051] Reference Figure 6 In this embodiment, the first lens 1 is made with a square chamfer to meet the large field of view light transmission requirements of the square DMD. After chamfering, the outer size is adapted to the narrow installation space of the car light module and will not increase the outer volume of the module.

[0052] When in use, install this lens into the vehicle headlight projection module, align the image plane 8 with the DMD working plane (32.0mm apart), and match the aperture stop 5 with the exit pupil of the lighting system to project the DMD image to a distance to form a magnified image.

[0053] A vehicle headlight includes a non-telecentric optical path projection lens as described in any of the above claims, and is further equipped with a DMD chip, an illumination system, and a projection control circuit. The DMD chip is installed at the image plane position of the projection lens. The non-telecentric illumination main ray and the non-telecentric imaging main ray of the projection lens are angle-matched, which can completely receive the imaging beam emitted by the DMD, reduce light energy loss, improve the light efficiency of the vehicle headlight projection, and meet the requirements of motor vehicle lighting regulations for the brightness of the projection spot. At the same time, the square-cut first lens 1 is adapted to the narrow installation space of the vehicle headlight module and can be adapted to different shapes of vehicle headlight housing designs.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention, as long as they do not depart from the spirit and scope of the technical solutions of the present invention, should be covered in the claims of the present invention. The "resin lens" referred to in the present invention is also known in the industry as "plastic lens", and the two can be used interchangeably in the field of optics.

Claims

1. A non-telecentric optical path projection lens, characterized in that: It includes a front lens group A with negative optical power, an aperture diaphragm B, and a rear lens group C with positive optical power arranged sequentially from the object side to the image side along the optical path; The front lens group A includes a first lens, a second lens, a third lens, and a fourth lens arranged sequentially along the optical path, wherein the first lens is a positive lens, the second and third lenses are both negative lenses, and the fourth lens is a positive lens; the rear lens group C includes a fifth lens and a sixth lens arranged sequentially along the optical path, wherein the fifth and sixth lenses are both positive lenses; the focal length of the front lens group A is fA, and the focal length of the rear lens group C is fC, wherein fA and fC satisfy: 7.5 < |fA / fC| < 9.0; the angle θ between the principal ray of the maximum field of view of the projection lens and the optical axis satisfies: 5° ≤ θ ≤ 15°.

2. A non-telecentric optical path projection lens according to claim 1, characterized in that: The first lens is biconvex, with an even-order aspherical object side and a spherical image side. The edges of the first lens are truncated to form a rectangular outer contour.

3. A non-telecentric optical path projection lens according to claim 1, characterized in that: The second lens is a negative meniscus that curves towards the image side, the third lens is a double concave shape, the fourth lens is a double convex shape, the fifth lens is a positive meniscus that curves towards the object side, and the sixth lens is a double convex shape.

4. A non-telecentric optical path projection lens according to claim 1, characterized in that: The first lens is an optical resin lens with a refractive index of 1.53 to 1.54; the second lens is a glass lens with a refractive index of 1.94 to 1.95; the third lens is a glass lens with a refractive index of 1.84 to 1.85; the fourth lens is a glass lens with a refractive index of 1.80 to 1.81; the fifth lens is a glass lens with a refractive index of 1.77 to 1.78; and the sixth lens is a glass lens with a refractive index of 1.70 to 1.

74.

5. A non-telecentric optical path projection lens according to claim 1, characterized in that: The surface curvature radii R of each lens satisfy the following: for the first lens, the object-side radius R1 is +64.285~+64.485mm, and the image-side radius R2 is -474.009~-474.209mm; for the second lens, the object-side radius R3 is +23.913~+24.113mm, and the image-side radius R4 is +16.882~+17.082mm; for the third lens, the object-side radius R5 is -17.564~-17.764mm, and the image-side radius R6 is +157.329~+157. The fourth lens has an object-side radius R7 of +168.897 to +169.007 mm and an image-side radius R8 of -29.767 to -29.967 mm; the fifth lens has an object-side radius R9 of -1840.198 to -1840.398 mm and an image-side radius R10 of -45.994 to -46.194 mm; the sixth lens has an object-side radius R11 of +51.3 to +51.5 mm and an image-side radius R12 of -449.496 to -449.696 mm.

6. A non-telecentric optical path projection lens according to claim 1, characterized in that: The center thickness t of each lens and the spacing d between adjacent surfaces satisfy the following: the first lens has a thickness of 6.05~6.25mm, and the spacing between its image-side surface and the object-side surface of the second lens is 0.175~0.195mm; the second lens has a thickness of 8.42~8.62mm, and the spacing between its image-side surface and the object-side surface of the third lens is 15.01~15.03mm; the third lens has a thickness of 5.25~5.27mm, and the spacing between its image-side surface and the object-side surface of the fourth lens is 0.14~0.16mm; the fourth lens has a thickness of 8.60~8.62mm, and the spacing between its image-side surface and the aperture stop is 0mm; the spacing between the aperture stop and the object-side surface of the fifth lens is 1.35~1.37mm; the fifth lens has a thickness of 5.88~5.90mm, and the spacing between its image-side surface and the object-side surface of the sixth lens is 0.13~0.15mm; the sixth lens has a thickness of 5.60~5.62mm, and the spacing between its image-side surface and the image plane is 32.00~32.02mm.

7. A non-telecentric optical path projection lens according to claim 1, characterized in that: The projection lens has an effective focal length f' of 39.2 mm, a relative aperture F / # of 1.1, a total optical system length of 90 mm, an image circle diameter of Φ13.97 mm, and a back focal length of 32.0 mm.

8. A non-telecentric optical path projection lens according to claim 1, characterized in that: The angle θ between the principal ray of the maximum field of view in the projection lens and the optical axis is 9.5°; the optical distortion of the projection lens is -1.25%, and the absolute value of the optical distortion is less than 1.3%.

9. A non-telecentric optical path projection lens according to any one of claims 1-8, characterized in that: It is compatible with 0.55-inch digital micromirror devices (DMDs) and maintains stable resolution and image plane without defocusing within an operating temperature range of -40℃ to +85℃.

10. A vehicle light, characterized in that: It includes a non-telecentric optical path projection lens as described in any one of claims 1-9.

Images