Five-Lens Optical Assembly for High-Angle, High-Resolution Imaging
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Solution Overview
Problem
The incident angle of main light at the central field of view required by high-pixel and high-resolution chips in portable electronic devices is larger than that of ordinary chips, leading to insufficient image resolution and lens modules that are no longer sufficient to meet consumer demand.
Innovation Solution
An optical lens assembly comprising five lenses with specific refractive powers and configurations, including a stop, a first lens with convex and concave surfaces, a second lens with convex and concave surfaces, a third lens with convex and concave surfaces, a fourth lens with convex surfaces, and a fifth lens with convex and concave surfaces, along with specific conditions on Abbe numbers, central thicknesses, and focal lengths to optimize image resolution and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-pixel and high-resolution chips are used to improve image quality, then image resolution is improved, but the incident angle of main light becomes larger causing insufficient image resolution
Solution Approach 1:
The patent divides the optical system into five separate lens elements with specific refractive powers and surface configurations. Each lens element is designed to handle specific portions of the light path, with the first lens having positive refractive power and convex object-side surface, the second lens having negative refractive power, and subsequent lenses configured to progressively correct aberrations. This segmentation allows independent optimization of each element to manage the large incident angles while maintaining high resolution.
Solution Approach 2:
The patent applies different surface configurations to different regions of the lens elements. Specifically, the object-side surface of the first lens is convex near the optical axis, the image-side surface of the first lens is concave near the optical axis, and similar regional variations are applied to other lenses. This local quality approach allows the lens to optimize light handling in different zones, particularly addressing the large incident angles at the central field of view while maintaining overall image resolution.
2Volume of moving object
If lens module size is reduced for miniaturization, then portability is improved, but image resolution capability deteriorates
Solution Approach 1:
The patent employs precise control of multiple optical parameters including the focal lengths of individual lenses (f1, f2, f3, f4, f5), the Abbe numbers of the second and third lenses (vd2, vd3), central thicknesses (CT2, CT3, CT5), and various ratio relationships between these parameters. By optimizing these parameters and their relationships, the patent achieves high-resolution imaging in a miniaturized form factor, resolving the contradiction between size reduction and resolution maintenance.
3Measurement precision
If five lenses with specific configurations are used to correct aberrations and improve resolution, then image quality is improved, but device complexity increases
Solution Approach 1:
The patent segments the optical system into five distinct lens elements, each with specific refractive powers and surface configurations. This segmentation enables targeted correction of different types of aberrations at different stages of the light path, achieving high resolution through systematic aberration management rather than relying on a single complex element.
Solution Approach 2:
Each lens element in the five-element system is designed to perform multiple functions: the first lens with positive refractive power and convex object-side surface handles initial light convergence, the second lens with negative refractive power provides divergence and aberration correction, and the subsequent lenses continue this multi-functional approach. This universality allows the system to achieve high resolution without requiring specialized additional components, managing complexity through functional integration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The optical lens assembly achieves better image resolution and miniaturization by adjusting the incident angle and correcting aberrations, resulting in a high-definition lens module with a larger viewing angle and improved manufacturability.
Implementation Method 1
a first lens with positive refractive power, comprising an object-side surface and an image-side surface, the object-side surface of the first lens being convex near an optical axis, and the image-side surface of the first lens being concave near the optical axis
Data Source
AI summary
An optical lens assembly includes, in order from an object side to an image side: a stop, a first lens, a second lens, a third lens, a fourth lens, and fifth lens, wherein an Abbe number of the second lens is vd2, an Abbe number of the third lens is vd3, a central thickness of the second lens along the optical axis is CT2, a central thickness of the third lens along the optical axis is CT3, the aperture number of the optical lens assembly is Fno, an incident angle of a main light incident at the position of 60% of the maximum image height of the optical lens assembly is CRA6, and the following conditions are satisfied: 3.54<(vd3*CT3−vd2*CT2)/Fno<8.18 and 28.25<CRA6<35.76.