Aspheric Lens System Aberration Control
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Solution Overview
Problem
Conventional photographic lens assemblies with a wide field of view often suffer from excessive high-order spherical aberration and manufacturing difficulties due to excessive curvature radii, necessitating a lens design that balances image quality and miniaturization.
Innovation Solution
An optical lens system comprising a first lens element with negative refractive power, a second lens element with positive refractive power, and a third lens element with negative refractive power, where all lens elements have aspheric surfaces, specifically designed to satisfy conditions that control optical length, correct aberrations, and enable miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional photographic lens assembly uses an inverse telephoto structure with three lens elements to achieve wide field of view and miniaturization, then the overall size is reduced, but excessive high-order spherical aberration occurs due to excessive curvature radii
Solution Approach 1:
The patent changes the curvature radius parameters of the lens elements, specifically setting the object-side surface curvature radius of the first lens element to a smaller value (0.5mm<R1<2mm) and using aspheric surfaces with optimized curvature radii for all elements. This parameter optimization reduces high-order spherical aberration while maintaining the compact size achieved by the inverse telephoto structure.
Solution Approach 2:
The patent employs aspheric surfaces for all lens elements instead of conventional spherical surfaces. The aspheric profiles with optimized curvature radii (R1, R2, R3, R4, R5, R6 within specific ranges) enable better control of light rays, reducing high-order spherical aberration while maintaining the compact form factor of the three-element inverse telephoto design.
2Manufacturing precision
If the curvature radius of the object-side surface of the first lens element is increased to reduce spherical aberration, then aberration is reduced, but the difficulty of lens manufacturing is increased
Solution Approach 1:
The patent optimizes the curvature radius parameter R1 to a specific range (0.5mm<R1<2mm) that balances aberration control and manufacturability. This parameter selection avoids excessive curvature radii that would be difficult to manufacture while still achieving effective reduction of high-order spherical aberration through the combination of three lens elements in inverse telephoto configuration.
Solution Approach 2:
By using aspheric surfaces with optimized curvature radii for all lens elements, the patent achieves better aberration control without requiring excessive curvature radii that would complicate manufacturing. The aspheric profiles provide flexibility in designing the curvature distribution to balance optical performance and manufacturing feasibility.
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 lens system effectively reduces high-order spherical aberration, simplifies manufacturing, and achieves a compact, lightweight design suitable for electronic devices by optimizing the refractive powers and surface curvatures of the lens elements.
Implementation Method 1
an optical lens system comprises, in order from an object side to an image side, a first lens element with negative refractive power, a second lens element with positive refractive power, and a third lens element with negative refractive power
Data Source
AI summary
An optical lens system for image taking includes, in order from an object side to an image side, a first lens element with negative refractive power having a concave object-side surface and a concave image-side surface, a second lens element with positive refractive power having a convex image-side surface, and a third lens element with negative refractive power having a concave image-side surface of the third lens element near an optical axis and a convex image-side surface of the third lens element away from the optical axis. Both the object-side surface and the image-side surface of the third lens element are aspheric. The third lens element is made of plastic.