Five-Element Plastic Optical Lens for Compact Imaging
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Solution Overview
Problem
Current optical imaging lens sets for portable electronic devices face challenges in minimizing length while maintaining high image quality and optical performance, with existing designs either compromising on image quality or being unsuitable for the compact dimensions of modern devices.
Innovation Solution
A five-lens element optical imaging lens set with specific refractive power distributions and surface geometries, including convex and concave portions, optimized to achieve a reduced length of less than 4.5 mm while maintaining excellent image quality by controlling aberrations and using a plastic material for the fifth lens element, along with strategically placed air gaps and aspherical surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lens elements is increased to improve image quality, then optical performance is improved, but system length increases
Solution Approach 1:
The optical system is divided into exactly five lens elements, each with specific refractive power assignments (positive, positive, negative, positive, negative) to segment the optical correction functions across multiple elements while controlling total length
Solution Approach 2:
The five lens elements are arranged in a compact nested configuration along the optical axis with controlled air gaps between them, allowing the system to achieve high optical performance within a condensed spatial structure of less than 4.5mm length
2Length of moving object
If the system length is reduced to meet compact device requirements, then device integration is improved, but optical performance deteriorates
Solution Approach 1:
The patent specifies precise parameter ranges including Ltt/Gaa≤7.5, Ltt/T1≤13.0, and Ltt/T2≤12.0 to optimize the distribution of optical power and physical dimensions, enabling compact length while maintaining aberration correction performance
Solution Approach 2:
Multiple lens elements incorporate aspherical surfaces with specific convex and concave portions to correct spherical aberration, astigmatism, and distortion while maintaining a compact form factor, replacing simple spherical surfaces with optimized curved geometries
3Manufacturing precision
If lens element thickness is increased to improve aberration correction, then image quality is improved, but system length increases
Solution Approach 1:
The patent establishes specific parameter relationships Ltt/T1≤13.0 and Ltt/T2≤12.0 to control the thickness of individual lens elements relative to total system length, ensuring adequate aberration correction without excessive length
Solution Approach 2:
The fifth lens element is made of plastic material while others use glass, creating a composite material system that balances aberration correction capabilities with compact dimensions and cost considerations
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 solution effectively reduces the lens set length while achieving improved spherical, astigmatic, and distortion aberrations, enabling high-quality imaging in compact portable devices with reduced production costs and dimensions.
Implementation Method 1
Both the first lens element and the second lens element have positive refractive power. The third lens element has negative refractive power. The fourth lens element has positive refractive power. The fifth lens element has negative refractive power.
Data Source
AI summary
An optical imaging lens set includes a first lens element to a plastic fifth lens element from an object side toward an image side along an optical axis. Each first lens and second lens element has positive refractive power. The third lens element has an image-side surface with a convex portion in a vicinity of the optical axis. The fourth lens element has an image-side surface with a convex portion in a vicinity of the optical axis. The fifth lens element has an image-side surface with a concave portion in a vicinity of the optical axis and a convex portion in a vicinity of its periphery.