Six-Lens Optical Image System Compactness Aberration Correction
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Solution Overview
Problem
Conventional compact lens assemblies for electronic devices face challenges in achieving both high image quality and compact size due to excessive total track length, insufficient aperture, and unfavorable image quality, making it difficult to satisfy both demands simultaneously.
Innovation Solution
An optical image system comprising six lens elements with specific refractive powers and surface shapes, including aspheric surfaces and air spaces between elements, is designed to optimize compactness and image quality by balancing refractive power and correcting aberrations, while using plastic or glass materials to reduce manufacturing complexity and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional compact lens assemblies use large aperture or telephoto characteristics, then the aperture or telephoto performance is improved, but the total track length becomes excessive and compact size is compromised
Solution Approach 1:
The lens assembly is divided into multiple lens elements (at least six lens elements) with different refractive powers and surface characteristics. By segmenting the optical system into multiple components with specific functions (positive and negative refractive powers, aspheric and non-aspheric surfaces), the patent achieves large aperture and telephoto characteristics while controlling the total track length through optimized distribution of optical power across segments.
Solution Approach 2:
Different lens elements are assigned different local qualities - some with aspheric surfaces for aberration correction, others with specific refractive powers. The patent applies local quality by making at least one surface of at least one lens element aspheric, and configuring specific lens elements with positive or negative refractive powers to optimize different regions of the optical path for specific functions while maintaining overall compactness.
2Length of stationary object
If conventional compact lens assemblies reduce total track length for compactness, then compact size is improved, but aperture becomes insufficient and image quality deteriorates
Solution Approach 1:
The patent changes key optical parameters including the refractive powers of individual lens elements, the curvature of surfaces (aspheric coefficients), and the spacing between elements. By optimizing parameters such as making at least one surface aspheric and configuring specific focal length relationships between lens elements, the system achieves compact total track length while maintaining sufficient aperture and image quality.
3Manufacturing precision
If conventional compact lens assemblies use more lens elements to improve image quality, then image quality is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent uses a segmented lens design with at least six lens elements, each with specific functions. This segmentation allows for optimized correction of different types of aberrations through carefully designed positive and negative refractive power elements, achieving high image quality while managing complexity through systematic functional distribution across elements.
Solution Approach 2:
The patent applies local quality by making at least one surface of at least one lens element aspheric, and configuring specific lens elements with particular refractive powers and surface curvatures. This targeted application of complex surface geometries only where needed optimizes image quality without unnecessarily increasing complexity across all elements.
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 image system achieves a balance between compact size and high image quality by correcting aberrations and optimizing refractive power distribution, enhancing the efficiency of the image sensor and reducing manufacturing difficulties, thus addressing the limitations of conventional systems.
Implementation Method 1
The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The second lens element has negative refractive power. The third lens element has negative refractive power.
Data Source
AI summary
An optical image system includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The second lens element has an image-side surface being concave in a paraxial region thereof. The third lens element has negative refractive power. The fifth lens element with negative refractive power has an object-side surface and an image-side surface being both aspheric. The sixth lens element has an object-side surface and an image-side surface being both aspheric.