CN-119937120-B - Athermalization microarray LED projection lens

CN119937120BCN 119937120 BCN119937120 BCN 119937120BCN-119937120-B

Abstract

The invention discloses a athermalized micro-array LED projection lens, which comprises a first lens, a diaphragm, a second lens, a third lens, a fourth lens and a fifth aspheric lens which are sequentially arranged from an object side to an image side along a main optical axis, wherein the first lens is a biconvex or plano-convex lens with positive focal power, the second lens is a meniscus lens with positive focal power, the third lens is a biconcave or plano-concave lens with negative focal power, the fourth lens is a meniscus lens with positive focal power or plano-convex lens with negative focal power, and the fifth aspheric lens is a meniscus aspheric lens with positive focal power. The problem of outdoor athermalization serious phenomenon is effectively solved, the light path can be effectively controlled through the matching of important parameters such as the surface curvature, the interval, the material characteristics and the like among the lenses, the lens size can be greatly shortened, the lens cost is reduced, meanwhile, various aberrations can be effectively controlled, the imaging quality is improved, and the lens has better thermal stability.

Inventors

LUO YANG
YAN SUFENG

Assignees

深圳小象光显有限公司

Dates

Publication Date: 20260512
Application Date: 20250221

Claims (4)

1. The athermalized micro-array LED projection lens is characterized by comprising a first lens, a diaphragm, a second lens, a third lens, a fourth lens and a fifth aspheric lens which are sequentially arranged from the object side to the image side along a main optical axis; The first lens is a biconvex lens with positive focal power or a plano-convex lens with a plane image side; the second lens is a meniscus lens with a positive focal power and a convex object side; The third lens is a biconcave lens with negative focal power or a plano-concave lens with an object side being a plane; The fourth lens is a meniscus lens with a concave object side of positive focal power or a plano-convex lens with a plane object side; The fifth aspheric lens is a meniscus-shaped aspheric lens with positive focal power and a convex object side; The focal length of the first lens of the athermal micro-array LED projection lens is The following conditions are satisfied: ; the focal length of the second lens of the athermal micro-array LED projection lens is The following conditions are satisfied: ; The focal length of the third lens of the athermal micro-array LED projection lens is The following conditions are satisfied: ; The fourth lens focal length of the athermal micro-array LED projection lens is The following conditions are satisfied: ; the focal length of the fifth aspheric lens of the athermal micro-array LED projection lens is The following conditions are satisfied: ; lens focal length of athermalized micro-array LED projection lens The total length L of the lens meets the following relation: 。
2. the athermalized microarray LED projection lens of claim 1, wherein at least one of said first lens and said second lens has a refractive index between 1.60-1.80; the refractive index of the third lens is between 1.64 and 1.95.
3. The athermalized microarray LED projection lens of claim 1, wherein at least one of said first lens and said second lens has an abbe number between 50-60; the abbe number of the third lens is between 19 and 34.
4. The athermalized microarray LED projection lens of claim 1, wherein the aperture F of said athermalized microarray LED projection lens satisfies the relationship: 。

Description

Athermalization microarray LED projection lens Technical Field The invention relates to the technical field of optical projection and optical illumination, in particular to a athermalized micro-array LED projection lens. Background Along with the development of semiconductor technology and the diversification of projection fields, the demands of people for projection equipment are becoming wider and more diverse, and the miniature projector is widely applied in the fields of personal entertainment, business offices, education and training and the like by virtue of the characteristics of small size and portability. Most of the miniature LED projection lenses in the current market adopt traditional cooling and thermal management designs, however, as the brightness of a light source is improved, the heat generated by an LED array is increased, the optical performance and the service life of a projection system are obviously influenced, particularly, when the temperature difference of an outdoor environment is relatively large, the lens is easy to lose focus due to low-temperature heat, the resolving power is poor due to the high-low temperature difference, the application flow becomes more complicated, and the lens optical system with low lumen does not take advantage in a place with brighter outdoor use environment, so that the lens optical system is not compatible with outdoor simple projection and illumination. Therefore, in order to solve the above-mentioned problems, an object of an embodiment of the present invention is to provide a non-thermal micro-array LED projection lens, which aims to solve the problem of thermal degradation of the micro-LED projection lens. Disclosure of Invention The invention aims to provide a athermalized micro-array LED projection lens, which solves the problem of outdoor athermalization severity. To achieve the purpose, the invention adopts the following technical scheme: The athermalized micro-array LED projection lens comprises a first lens, a diaphragm, a second lens, a third lens, a fourth lens and a fifth aspheric lens which are sequentially arranged from an object side to an image side along a main optical axis, wherein the first lens is a biconvex or plano-convex lens with positive focal power, the second lens is a meniscus lens with positive focal power, the third lens is a biconcave or plano-concave lens with negative focal power, the fourth lens is a meniscus or plano-convex lens with positive focal power, and the fifth aspheric lens is a meniscus aspheric lens with positive focal power. Further, the focal length of the first lens of the athermalized micro-array LED projection lens isThe following conditions are satisfied: 。 further, the focal length of the second lens of the athermal micro-array LED projection lens is The following conditions are satisfied: 。 further, the focal length of the third lens of the athermal micro-array LED projection lens is The following conditions are satisfied: 。 Further, the focal length of the fourth lens of the athermal micro-array LED projection lens is The following conditions are satisfied: 。 Further, the focal length of the fifth aspheric lens of the athermal micro-array LED projection lens is The following conditions are satisfied: 。 further, the lens focal length of the athermalized micro-array LED projection lens The total length L of the lens meets the following relation: 。 Further, at least one of the first lens and the second lens has a refractive index between 1.60 and 1.80; the refractive index of the third lens is between 1.64 and 1.95. Further, at least one of the first lens and the second lens has an Abbe number between 50 and 60, and the third lens has an Abbe number between 19 and 34. Further, the aperture F of the athermal micro-array LED projection lens satisfies the following relationship: 。 compared with the prior art, the invention has the following beneficial effects: Through the collocation of important parameters such as the surface curvature, the interval, the material characteristics and the like among the lenses, the light path can be effectively controlled, the lens size can be greatly shortened, the lens cost can be reduced, the geometric efficiency of the lens can be effectively improved, various aberrations can be effectively controlled, the imaging quality is improved, the high light efficiency is improved, the lens has better thermal stability, the outdoor athermalization serious phenomenon is effectively improved, and the problem of switching between an outdoor projection system and an illumination system can be compatible. Drawings In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained fro