Three-Lens Optical System with Aspheric Surfaces for Aberration Correction
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Solution Overview
Problem
Conventional miniaturized optical systems for camera mobile phones face challenges in reducing size while maintaining high image quality and correcting aberrations, as they require a larger total optical height and more lenses, making them unsuitable for further miniaturization.
Innovation Solution
A three-lens optical system with a first lens element having positive refractive power and at least one aspheric surface, a second lens element with negative refractive power, and a third lens element with negative refractive power and an aspheric surface, using plastic materials for injection molding to reduce size and aberrations, and optimizing Abbe numbers and radius of curvature ratios to correct chromatic and high-order aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional triplet optical system is used, then aberration correction is improved, but the total optical height increases making miniaturization difficult
Solution Approach 1:
The patent changes the refractive power distribution parameters by making the first lens element have strong positive refractive power and the second and third lens elements have negative refractive power. This parameter change allows for a compact optical path while maintaining aberration correction capability through the balanced refractive power configuration.
Solution Approach 2:
The patent employs aspheric surfaces on the first and third lens elements to correct aberrations. The aspheric curvature profiles enable effective aberration correction with reduced optical height compared to conventional spherical lens designs, as the aspheric surfaces provide additional degrees of freedom for controlling light paths.
2Length of stationary object
If the number of lenses is reduced for miniaturization, then the optical system size is reduced, but aberration correction capability deteriorates
Solution Approach 1:
The patent uses plastic materials for the lens elements that can be molded with aspheric surfaces. This material choice enables integration of multiple functions (refractive power, aspheric correction surfaces) into fewer lens elements, achieving both miniaturization and aberration correction with only three lenses.
Solution Approach 2:
Each lens element in the three-lens system performs multiple functions: the first lens element provides strong positive refractive power and aspheric aberration correction, the second lens element provides negative refractive power for focal length control, and the third lens element combines negative refractive power with aspheric correction. This multi-functionality allows effective aberration correction with minimal lens count.
3Ease of manufacture
If plastic materials are used for injection molding, then manufacturing cost is reduced, but manufacturing precision may be compromised
Solution Approach 1:
The patent specifies precise aspheric surface profiles with defined curvature equations for the first and third lens elements. These mathematical definitions enable high-precision injection molding by providing exact target geometries, ensuring that the molded plastic lenses achieve the required optical precision for aberration correction.
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 optical system's size, improves image quality, and increases the field of view by balancing refractive powers and correcting aberrations, making it suitable for more miniaturized applications while maintaining high precision at a lower cost.
Implementation Method 1
a first lens element with positive refractive power being provided with at least one aspheric surface; a third lens element with negative refractive power being provided with at least one aspheric surface
Data Source
AI summary
An optical system comprises three lens elements with refractive power, wherein a first lens element with positive refractive power includes at least one aspheric surface, a second lens element with negative refractive power, and a third lens element with negative refractive power includes at least one aspheric surface, which are mounted orderly from the object side to the image side. By such arrangements, the volume of the lens assembly can be reduced, and can obtain high resolution.