Six-Lens Optical Module Compact Design for Mobile Terminals
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Solution Overview
Problem
High-resolution lens modules with multiple lenses face challenges in miniaturization due to increased optical system length, making them difficult to mount in thin mobile communications terminals.
Innovation Solution
A lens module design featuring six lenses with specific refractive powers and surface curvatures, including aspherical surfaces, optimized to minimize overall length while maintaining high resolution and correcting aberrations, with constraints on focal lengths, distances, and radii of curvature to achieve a compact and effective optical system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If six lenses are used to configure a high-resolution optical system, then resolution is improved, but optical system length increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive indices, Abbe numbers, and radius of curvature ratios of the six lenses. Specific conditional expressions are established for these parameters to optimize the optical system, allowing high resolution to be achieved while minimizing the overall length of the optical system through mathematical optimization of optical parameters
Solution Approach 2:
The patent utilizes aspherical surfaces on certain lens elements (specifically the third, fourth, and sixth lenses have aspherical image-side surfaces). This curvature design allows for better aberration correction and enables compacting the optical system by reducing the need for additional lens elements, thereby achieving high resolution with a shorter optical path length
2Ease of operation
If optical system length is reduced for miniaturization, then ease of mounting is improved, but aberration correction becomes more difficult
Solution Approach 1:
The patent divides the optical system into six distinct lens elements with specific functional assignments. The first and second lenses form a positive meniscus combination for basic focusing, while the third through sixth lenses with aspherical surfaces handle aberration correction. This segmentation allows each element to be optimized for its specific function, achieving compact size while maintaining aberration correction capability
Solution Approach 2:
The patent specifies composite material properties for the lenses, particularly requiring that the first and second lenses have different Abbe numbers (|V1-V2|≥30) and specific refractive index ranges. This use of optically composite materials with different dispersion characteristics enables effective chromatic aberration correction in the compact six-element design, ensuring reliability despite the reduced optical path length
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 design achieves a significantly miniaturized lens module with a wide field of view and high resolution, satisfying conditional expressions that optimize aberration correction and manufacturing feasibility, enabling the lens module to be compact enough for thin mobile communications terminals.
Implementation Method 1
a first lens having negative refractive power
Implementation Method 2
a second lens, an object-side surface thereof being convex, and an image-side surface thereof being convex
Implementation Method 3
a third lens, an object-side surface thereof being concave, and an image-side surface thereof being convex
Implementation Method 4
a fourth lens having refractive power; a fifth lens having refractive power; and a sixth lens having one or more inflection points on an image-side surface thereof
Data Source
AI summary
A lens module includes a first lens, an object-side surface thereof being concave, a second lens, an object-side surface thereof being convex, and an image-side surface thereof being convex, a third lens, an object-side surface thereof being concave, a fourth lens having refractive power, a fifth lens having refractive power, and a sixth lens having one or more inflection points on an image-side surface thereof, wherein the first to sixth lenses are sequentially disposed in numerical order from the first lens to the sixth lens starting at an object side of the lens module.