Six-Lens Optical Module with Aspherical Curvature for Compact High-Resolution Imaging
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Solution Overview
Problem
Lens modules with high resolution configurations using multiple lenses face challenges in miniaturization due to increased focal length, making it difficult to mount them in thin portable devices.
Innovation Solution
A lens module design incorporating specific refractive power and surface configurations for six or more lenses, including convex and concave surfaces, and inflection points on the sixth lens, optimized to reduce overall length while maintaining high resolution and low F-number, using materials like plastic or glass with aspherical surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple lenses (six or more) are used to achieve high resolution imaging, then imaging resolution is improved, but the focal length increases making the lens module too long for thin portable devices
Solution Approach 1:
The patent applies aspherical surfaces to multiple lenses (first, second, third, fourth, fifth, and sixth lenses) with specific curvature variations. The aspherical surfaces allow for compact lens spacing while maintaining high resolution by reducing spherical aberration and enabling shorter focal length design. The curvature parameters (e.g., R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12) are optimized to achieve both compact size and imaging quality.
Solution Approach 2:
The patent employs systematic variation of refractive indices (n1, n2, n3, n4, n5, n6) and Abbe numbers (v1, v2, v3, v4, v5, v6) for each lens element to optimize the optical system. By carefully selecting and adjusting these material parameters, the design achieves high resolution with reduced focal length, resolving the contradiction between image quality and compact size.
2Length of moving object
If multiple lenses with high refractive power are used to reduce focal length, then lens module length is reduced, but manufacturing precision requirements increase due to complex surface configurations
Solution Approach 1:
The aspherical surface designs with mathematically defined curvature profiles enable compact lens spacing while providing clear manufacturing specifications. The standardized aspherical surface equations and parameters (radii of curvature, conic constants, higher-order coefficients) facilitate precise manufacturing through modern molding or grinding techniques, making the complex surfaces producible with contemporary precision manufacturing capabilities.
3Measurement precision
If aspherical surfaces with inflection points are used on the sixth lens, then aberration is reduced improving image quality, but manufacturing complexity and cost increase
Solution Approach 1:
The aspherical surface on the sixth lens with one or more inflection points effectively corrects residual aberrations (spherical, coma, astigmatism) to achieve high image quality. The inflection points in the curvature profile provide enhanced aberration correction capability. Modern aspherical molding technology makes this manufacturable by incorporating the aspherical profile directly into the mold cavity, eliminating the need for complex post-processing and keeping costs manageable despite the enhanced optical performance.
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 compact lens module with high resolution imaging capabilities, reduced aberration, and lower manufacturing costs, suitable for portable devices with improved light transmissivity and refractive power distribution.
Implementation Method 1
a first lens having refractive power and a convex object-side surface; a second lens having refractive power and a convex object-side surface; a third lens having refractive power and a convex object-side surface; a fourth lens having refractive power, both surfaces of the fourth lens being convex; a fifth lens having refractive power and a convex image-side surface; and a sixth lens having refractive power and a concave image-sided surface
Data Source
AI summary
A lens module includes a first lens having positive refractive power, a second lens having positive refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, a fifth lens having positive or negative refractive power, and a sixth lens having negative refractive power. One or more inflection points may be formed on an image-side surface of the sixth lens.