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CN-122015032-A - Vehicle-mounted projection lens and car lamp using same

CN122015032ACN 122015032 ACN122015032 ACN 122015032ACN-122015032-A

Abstract

The invention belongs to the technical field of vehicle lamps, and particularly relates to a vehicle-mounted projection lens and a vehicle lamp using the same, which at least comprise a first micro-lens array layer and a second micro-lens array layer which are sequentially arranged from an image side to an object side along an optical axis direction; the first microlens array layer comprises a first aspheric lens group, a first plane lens and a second aspheric lens group which are sequentially arranged from an image side to an object side along the optical axis direction, the second microlens array layer comprises a third aspheric lens group, a second plane lens and a fourth aspheric lens group which are sequentially arranged from the image side to the object side along the optical axis direction, and the surface of the second plane lens facing the fourth aspheric lens group is provided with a microlens pattern layer. The vehicle-mounted projection lens provided by the invention has the advantages that the field angle is obviously improved on the premise of keeping the miniaturization of the vehicle-mounted projection lens, and meanwhile, the high imaging quality and the high light efficiency are simultaneously realized.

Inventors

  • Bao Zhengbin
  • LIU YUEFEI
  • SONG JIAN
  • HU JINMING

Assignees

  • 常州星宇车灯股份有限公司

Dates

Publication Date
20260512
Application Date
20260326

Claims (10)

  1. 1. A vehicle-mounted projection lens is characterized by at least comprising a first micro-lens array layer and a second micro-lens array layer which are sequentially arranged from an image side to an object side along an optical axis direction, wherein The first micro lens array layer comprises a first aspheric lens group, a first plane lens and a second aspheric lens group which are sequentially arranged from an image side to an object side along the optical axis direction; and a microlens pattern layer is designed on the surface of the second plane lens facing the fourth aspheric lens group.
  2. 2. The vehicle-mounted projection lens of claim 1, wherein the first aspheric lens group comprises a plurality of first aspheric lenses distributed in an array, and the second aspheric lens group comprises a plurality of second aspheric lenses distributed in an array; The plurality of first aspheric lenses and the plurality of second aspheric lenses are distributed on two sides of the first plane lens in a one-to-one mode; The third aspheric lens group comprises a plurality of third aspheric lenses distributed in an array manner, and the fourth aspheric lens group comprises a plurality of fourth aspheric lenses distributed in an array manner; the third aspheric lenses and the fourth aspheric lenses are distributed on two sides of the second plane lens in a one-to-one mode.
  3. 3. The vehicle-mounted projection lens of claim 2 wherein the first and third aspheric lenses are convex lenses having positive optical power and the second and fourth aspheric lenses are convex lenses having negative optical power.
  4. 4. The vehicle-mounted projection lens of claim 3, wherein the refractive indexes of the materials of the first, second, third and fourth aspheric lenses are 1.45-1.65, and the abbe numbers are 45-65.
  5. 5. The vehicle-mounted projection lens as claimed in any one of claims 2-4, wherein the first and second planar lenses are planar glass lenses with identical materials, and The refractive index of the materials of the first plane lens and the second plane lens is 1.4-1.5, and the Abbe number is 50-70.
  6. 6. The vehicle-mounted projection lens according to any one of claims 1 to 4, wherein a diaphragm is further disposed between the first aspheric lens group and the first planar lens.
  7. 7. The vehicle-mounted projection lens according to claim 1 or 2, wherein the F number of the vehicle-mounted projection lens is 1.2-1.4.
  8. 8. The in-vehicle projection lens according to claim 1 or 2, wherein the full field angle of the in-vehicle projection lens is between 20 ° and 42 ° and the relative illuminance at the marginal field is not lower than 91% of the central field.
  9. 9. The in-vehicle projection lens of claim 8, wherein the distortion of the in-vehicle projection lens at the maximum field of view is less than 4% and the vertical chromatic aberration is less than 2.5 μm.
  10. 10. A vehicle lamp, comprising at least the vehicle-mounted projection lens according to any one of claims 1 to 9.

Description

Vehicle-mounted projection lens and car lamp using same Technical Field The invention belongs to the technical field of car lamps, and particularly relates to a vehicle-mounted projection lens and a car lamp using the same. Background Along with the rapid development of the intelligent and interactive technology of the automobile, the functions of the automobile lamp are gradually evolved from traditional illumination and signal indication to a core carrier for information interaction between the automobile and surrounding environment and pedestrians, and are also important components for improving the running safety of the automobile and enhancing the driving experience. The vehicle-mounted ground projection technology is used as a key direction of upgrading the function of the vehicle lamp, clear images, light spots, guide lines or character information can be projected to the ground around the vehicle through the vehicle lamp, the multi-dimensional practical function is realized, namely, a warning light blanket is projected on the side of the vehicle door, visual safety warning can be formed for the vehicles and pedestrians at the back, potential safety hazards of door opening, side leaning and other operations are reduced, character and graphic information such as welcome animation, electric quantity cruising and vehicle states are projected in front of the vehicle, humanized human-vehicle interaction can be realized, driving experience is improved, contents such as reversing guide lines, turning track lines and vehicle width outline lines are projected, accurate judgment of the vehicle posture, the driving path and the peripheral distance can be assisted by a driver, and the accuracy and safety of assisted driving are improved. The implementation mode of the current vehicle-mounted ground projection technology mainly comprises micro lens array (MLA: micro LENS ARRAY) projection, film projection, DLP (DIGITAL LIGHT Procession) projection, free-form surface projection and the like. The micro lens array projection has the technical advantages of small size, high light efficiency, high uniformity of projection patterns and large design freedom, can adapt to the severe requirements of vehicle-mounted scenes on miniaturization and integration of optical modules, becomes a core direction and important prospect of the technical development of vehicle-mounted projection lamps, and has been primarily applied to vehicle-mounted products such as steering projection lamps, welcome light blanket lamps and the like. However, in practical vehicle-mounted application, the existing microlens array projection technology still has a core technical problem of limited field angle, and the problem severely restricts the application expansion of the existing microlens array projection technology in vehicle-mounted projection of a large scene. In the prior art, three types of technical paths are mainly formed aiming at the improvement scheme of the projection field angle of the micro lens array, but the three types of technical paths have obvious technical defects and short application plates, and the comprehensive requirements of a vehicle-mounted scene on a large field angle, high image quality, miniaturization, low processing cost and easy mass production are difficult to consider, and the specific defects are as follows: The single-layer microlens array structure adopted by the traditional vehicle-mounted projection is a basic scheme with limited field angle, and the maximum field angle practically achievable is only about 20 degrees, so that the application requirement of the vehicle-mounted large-scene projection can not be met. If the view angle is increased in an attempt to splice multiple modules, the overall structure volume of the projection optical system is greatly increased, contradicts with the miniaturization and integration design requirements of the vehicle-mounted vehicle lamp, and the problems of difficult focusing at the spliced position, misplacement of spliced projection patterns, overlapping light efficiency loss and the like are also caused, meanwhile, the production and manufacturing cost and the assembly difficulty of the modules are greatly improved, and the practical mass production application value is lacked. In an attempt to improve the angle of view, the single-layer microlens array structure also has double deterioration of image quality and light efficiency, and the problems of spherical aberration, coma aberration, distortion and other aberration are prominent, so that the definition and uniformity of a projection pattern are greatly reduced, and the core technical advantages of microlens array projection are lost. In part of the prior art, an attempt is made to design a three-layer micro-lens array system by increasing the layer number of the micro-lens array to improve the angle of view, and a certain effect is achieved on the improvement of the angle of view, but the scheme brings new tec