Wide Angle Optical Lens System with Aspheric Elements
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Solution Overview
Problem
Current wide angle optical lens systems for portable electronic devices suffer from high distortion and excessive length, failing to meet the requirements for miniaturization and high image quality, especially in providing a wide field of view and high resolution.
Innovation Solution
A miniaturized wide angle optical lens system comprising six plastic lens elements with specific refractive powers and aspheric surfaces, optimized by conditions such as focal length ratios, radius of curvature, and central thickness, to reduce back focal length, correct spherical aberration, and enhance production yield and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If five to six lens elements are used to provide wider angle of view and high image quality, then image quality is improved, but total track length becomes too long and distortion increases
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive powers, curvature radii, and thicknesses of the six lens elements to achieve a compact design. Specifically, the conditional expressions for focal length ratios and curvature relationships are designed to minimize total track length while maintaining wide angle of view and high image quality, resolving the contradiction between image quality and system length.
Solution Approach 2:
The patent employs aspheric surfaces on all six lens elements to correct aberrations and improve image quality without increasing system length. The aspheric design allows for more efficient light path control, enabling compact total track length while maintaining high manufacturing precision for wide-angle imaging.
2Manufacturing precision
If five to six lens elements are used to provide wider angle of view and high image quality, then image quality is improved, but distortion becomes large
Solution Approach 1:
The patent uses parameter changes by establishing specific conditional expressions for the refractive powers and curvature radii of the lens elements. These parameters are optimized to balance wide angle of view with distortion control, allowing high image quality to be achieved without excessive distortion in the six-element configuration.
Solution Approach 2:
The aspheric surfaces on all lens elements are designed with specific curvature profiles that correct for distortion while maintaining wide angle of view. The aspheric design enables precise control of light rays across the field, reducing distortion artifacts while preserving high image quality.
3Area of moving object
If angle of view is increased to meet wide-angle shooting requirements, then field of view is improved, but system length increases making it unsuitable for mobile devices
Solution Approach 1:
The patent applies parameter changes by optimizing the focal length ratios and curvature radii of the six lens elements to achieve a back focal length that is 0.05 times the focal length or less. This parameter optimization enables a wide field of view (90 degrees or more) while maintaining a compact system length suitable for mobile devices.
Solution Approach 2:
The aspheric surfaces are designed with specific curvature characteristics that enable wide-angle light gathering without increasing system length. The aspheric profiles efficiently direct oblique rays to the image plane, achieving 90-degree or wider field of view in a compact configuration suitable for portable electronics.
4Manufacturing precision
If six lens elements with complex aspheric surfaces are used to correct spherical aberration and improve image quality, then manufacturing precision is improved, but production yield decreases
Solution Approach 1:
The patent applies parameter changes by establishing specific conditional expressions for the aspheric surface parameters of the six lens elements. These parameters are optimized to balance manufacturing feasibility with image quality requirements, ensuring that the complex aspheric surfaces can be produced with acceptable yield through precision molding techniques.
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 achieves a compact, high-resolution wide angle optical lens system with improved image quality, reduced distortion, and increased production yield, suitable for use in portable electronic devices.
Implementation Method 1
a first lens element with a negative refractive power having an aspheric object-side surface and an aspheric image-side surface
Data Source
AI summary
A wide angle optical lens system includes an aperture stop and an optical assembly, the optical assembly includes, in order from the object side to the image side: a first lens element with a negative refractive power; a second lens element with a positive refractive power; a third lens element with a negative refractive power; a fourth lens element with a refractive power; a fifth lens element with a positive refractive power; a sixth lens element with a negative refractive power, wherein a focal length of the wide angle optical lens system is f, a focal length of the fifth lens element is f5, a radius of curvature of an object-side surface of the third lens element is R5, a radius of curvature of an image-side surface of the third lens element is R6, the following conditions are satisfied: 1.0<f/f5<3.8; −3.5<(R6+R5)/(R6−R5)<0.6.