Camera Lens Free-Form Surface Aberration Correction
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Solution Overview
Problem
Existing camera optical lenses face challenges in achieving a balance between large aperture, ultra-thinness, and wide angle, with insufficient refractive power distribution, lens spacing, and lens shape settings, leading to suboptimal aberration correction, particularly in wide-angle and ultra-wide-angle designs.
Innovation Solution
A camera optical lens design incorporating a series of lenses with specific refractive powers and free-form surfaces, where at least one of the lenses includes a free-form surface, optimizing the distribution of refractive powers and curvature radii to achieve good optical performance, including a convex or concave surface configuration at paraxial positions, and satisfying specific relational expressions for focal lengths, curvature ratios, and on-axis thicknesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lens structures are used, then manufacturing is simpler, but optical performance and aberration correction are insufficient
Solution Approach 1:
The patent applies free-form surfaces with non-rotational symmetry to lens surfaces, replacing conventional rotationally symmetric aspheric surfaces. This asymmetric design enables better aberration correction and improved optical performance by providing more degrees of freedom in surface profile optimization, directly addressing the insufficiency of conventional symmetric lens structures.
Solution Approach 2:
The patent optimizes multiple lens parameters including refractive powers, curvature radii, and thickness ratios according to specific conditional expressions. By systematically adjusting these parameters within defined ranges, the design achieves improved optical performance while controlling lens complexity through mathematical constraints on focal length ratios, curvature relationships, and dimensional proportions.
2Length of moving object
If lens thickness is reduced for ultra-thinness, then portability improves, but aberration correction becomes more difficult
Solution Approach 1:
The free-form surfaces provide enhanced aberration correction capabilities in thin lens designs by utilizing non-rotational symmetry to compensate for the reduced optical path length. The asymmetric surface profiles enable effective correction of spherical aberration, coma, and other off-axis aberrations even when lens thickness is minimized for ultra-thin applications.
Solution Approach 2:
The patent applies free-form surfaces selectively to specific lens elements where they provide the most benefit for aberration correction. By concentrating complex surface profiles in strategic locations within the lens assembly, the design achieves effective aberration control in ultra-thin configurations without requiring all lens elements to be thick or complex.
3Illumination intensity
If aperture is increased for better light gathering, then imaging quality improves, but lens complexity and difficulty in aberration correction increase
Solution Approach 1:
The free-form surfaces enable effective aberration correction for large aperture designs by providing the additional surface complexity needed to control off-axis rays. The non-rotational symmetry allows the lens to manage the increased bundle of rays entering through larger apertures, correcting coma and astigmatism that would otherwise be difficult to control in wide-aperture configurations.
Solution Approach 2:
The patent optimizes refractive power distribution and curvature radii according to specific conditional expressions that are particularly suited for large aperture designs. By adjusting these parameters within defined ranges, the design achieves effective aberration correction for wide apertures while controlling overall lens complexity through mathematical constraints on focal length ratios and curvature relationships.
4Reliability
If conventional aspheric surfaces with rotational symmetry are used, then manufacturing is easier, but aberration correction is insufficient
Solution Approach 1:
The patent implements free-form surfaces with non-rotational symmetry to achieve superior aberration correction. The asymmetric surface profiles provide more degrees of freedom for optimizing optical performance compared to conventional rotationally symmetric aspheric surfaces, enabling correction of multiple aberration types simultaneously through the single surface geometry.
Solution Approach 2:
The patent optimizes surface parameters according to specific conditional expressions that balance manufacturing feasibility with optical performance. By constraining certain parameter ranges and relationships, the design maintains manufacturability while achieving the aberration correction benefits of free-form surfaces through controlled variations in surface profile parameters.
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 design achieves excellent optical performance with a large aperture, ultra-thinness, and wide angle, effectively correcting aberrations and improving imaging quality, making it suitable for mobile phone and web camera lenses with high pixel CCD and CMOS camera elements.
Implementation Method 1
at least one of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens includes a free-form surface
Data Source
AI summary
The present disclosure relates to the field of optical lenses, and discloses a camera optical lens. The camera optical lens includes eight lenses, and the eight lenses includes successively from an object side to an image side: a first lens having negative refractive power, a second lens having positive refractive power, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. An object side surface of the eighth lens is a convex surface at a paraxial position, an image side surface thereof is a concave surface at a paraxial position, and at least one of the first lens to the eighth lens includes a free-form surface. The camera optical lens of the present disclosure has good optical performance while meeting design requirements of a large aperture, ultra-thinness, and a wide angle while.