Plastic Aspheric Lens System for Compact Imaging
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Solution Overview
Problem
Conventional image pick-up lens systems face challenges in achieving a balance between compactness, low cost, lightweight design, and high shock resistance while maintaining excellent optical performance, primarily due to the use of glass spherical lenses that are prone to damage and spherical aberration.
Innovation Solution
The image pick-up lens system consists of four aspheric lenses made from plastic materials, with specific refractive indices and Abbe numbers, aligned in a particular order to provide positive and negative diffractive powers, addressing the need for lightweight and shock-resistant optics while correcting aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If glass spherical lenses are used, then manufacturing ease is improved, but weight increases and shock resistance deteriorates
Solution Approach 1:
The patent changes the material parameter from glass to plastic, which fundamentally alters the density and weight characteristics while maintaining optical functionality. Plastic lenses achieve the required optical performance with significantly reduced weight compared to traditional glass lenses.
Solution Approach 2:
The patent employs plastic as a composite material alternative to glass, combining the advantages of lightweight properties with optical clarity and shock resistance. This material substitution resolves the contradiction between manufacturing ease and weight reduction.
2Ease of manufacture
If glass spherical lenses are used, then manufacturing ease is improved, but shock resistance deteriorates
Solution Approach 1:
The patent changes the material parameter from glass to plastic, which fundamentally alters the density and weight characteristics while maintaining optical functionality. Plastic lenses achieve the required optical performance with significantly reduced weight compared to traditional glass lenses.
Solution Approach 2:
The patent employs plastic as a composite material alternative to glass, combining the advantages of lightweight properties with optical clarity and shock resistance. This material substitution resolves the contradiction between manufacturing ease and weight reduction.
3Ease of manufacture
If spherical lenses are used, then manufacturing ease is improved, but optical performance deteriorates due to spherical aberration
Solution Approach 1:
The patent employs asymmetric aspheric lens surfaces instead of symmetric spherical surfaces. The aspheric profiles are designed with specific mathematical functions to correct spherical aberration and other optical distortions, achieving superior optical performance while maintaining manufacturing feasibility through modern molding techniques.
Solution Approach 2:
The patent utilizes aspheric curvature profiles that deviate from simple spherical geometry. The lens surfaces are designed with complex curvature variations described by aspheric equations, enabling precise control of light paths and correction of optical aberrations.
4Length of moving object
If the lens system is downsized, then compactness is improved, but optical performance may deteriorate
Solution Approach 1:
The patent employs asymmetric aspheric lens surfaces instead of symmetric spherical surfaces. The aspheric profiles are designed with specific mathematical functions to correct spherical aberration and other optical distortions, achieving superior optical performance while maintaining manufacturing feasibility through modern molding techniques.
Solution Approach 2:
The patent utilizes aspheric curvature profiles that deviate from simple spherical geometry. The lens surfaces are designed with complex curvature variations described by aspheric equations, enabling precise control of light paths and correction of optical aberrations.
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
This configuration results in a compact, cost-effective, and optically superior lens system with improved shock resistance and corrected aberrations, suitable for miniaturized image pickup devices.
Implementation Method 1
a first lens with positive diffractive power, a second lens with negative diffractive power, a third lens with positive diffractive power, and a fourth lens with negative diffractive power
Implementation Method 2
Each of the four lenses is an aspheric lens made from a plastic material
Data Source
AI summary
A image pick-up lens system includes: a first lens with positive diffractive power, a second lens with negative diffractive power, a third lens with positive diffractive power, and a fourth lens with negative diffractive power. The first lens, the second lens, the third lens and the fourth lens are aligned in that order from an object side to an image side, and each of the four lenses is an aspheric lens made from a plastic material.