Aspheric Lens System Aberration Correction Miniaturization
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Solution Overview
Problem
Conventional mobile phone camera optical lens systems face challenges in miniaturization due to the limitations of refractive power distribution, sensitivity, and aberration correction, particularly with meniscus-shaped third lens elements and spherical lens designs, which hinder image quality and mechanical compactness.
Innovation Solution
A three-lens optical system with an aperture stop, a first lens element having positive refractive power with aspheric surfaces, a second lens element with negative refractive power and aspheric surfaces for chromatic aberration correction, and a third lens element with positive refractive power and aspheric surfaces to balance refractive power and correct aberrations, reducing system sensitivity and total track length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a meniscus-shaped third lens element is used, then the lens element can be manufactured easily, but the refractive power of the third lens element is limited
Solution Approach 1:
The patent employs asymmetric surface designs including aspheric surfaces and tilted surfaces on the third lens element. This breaks the symmetry of traditional meniscus lenses, enabling both manufacturing feasibility and enhanced refractive power through optimized light path control at different zones of the lens surface.
Solution Approach 2:
The patent utilizes aspheric surfaces with variable curvature radii on the third lens element. By transitioning from constant curvature (spherical) to variable curvature (aspheric), the lens achieves higher refractive power while maintaining manufacturability through modern molding techniques.
2Power
If the refractive power of the first lens element is increased to compensate for limited third lens element power, then the required refractive power can be achieved, but the sensitivity of the optical lens system increases
Solution Approach 1:
The patent divides the total refractive power requirement into multiple segments across three lens elements. The first lens element provides positive power, the second provides negative power for aberration correction, and the third provides positive power with tilted surfaces. This segmentation distributes the optical burden, preventing excessive sensitivity while achieving the required total refractive power.
Solution Approach 2:
The patent applies different surface characteristics to different lens elements based on their specific functions. The third lens element features tilted surfaces and aspheric profiles optimized for its location in the optical path, allowing it to contribute effectively to refractive power without requiring the first lens element to operate at high sensitivity levels.
3Ease of manufacture
If a spherical glass lens element is used for the third lens element, then the lens can be manufactured, but the degrees of freedom for correcting off-axis aberration are reduced
Solution Approach 1:
The patent replaces spherical surfaces with aspheric surfaces on the third lens element. Aspheric surfaces provide additional degrees of freedom through their variable curvature profiles, enabling effective correction of off-axis aberrations such as astigmatism and field curvature while remaining manufacturable through precision molding techniques.
Solution Approach 2:
The patent introduces asymmetric tilted surfaces on the third lens element that are tilted relative to the optical axis. This asymmetric configuration provides additional control over off-axis light paths, enabling correction of off-axis aberrations that cannot be addressed by symmetric spherical or simple meniscus surfaces.
4Device complexity
If an aperture stop is located between the first lens element and the second lens element, then the optical system can be designed, but the total track length becomes relatively long
Solution Approach 1:
The patent tilts the third lens element relative to the optical axis, introducing a dimensional change in the lens orientation. This tilted configuration allows the aperture stop to be positioned more optimally within the compact space, reducing the total track length while maintaining the necessary optical functions and aberration correction capabilities.
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 enhances image quality, reduces the optical lens system's volume, improves photosensitivity, and corrects aberrations effectively, while maintaining miniaturization and compatibility with electronic imaging sensors.
Implementation Method 1
a first lens element with positive refractive power having a convex object-side surface and a concave image-side surface; a second lens element with negative refractive power having a concave object-side surface and a convex image-side surface, at least one of the object-side surface and the image-side surface of the second lens element being aspheric
Data Source
AI summary
An optical lens system for taking image consisting of from the object side to the image side: an aperture stop; a first lens element with positive refractive power having a convex object-side surface and a concave image-side surface; a second lens element with negative refractive power having a concave object-side surface and a convex image-side surface, at least one of the object-side and the image-side surfaces of the second lens element being aspheric; and a third lens element with positive refractive power having a convex object-side surface and a convex image-side surface, at least one of the object-side and the image-side surfaces of the third lens element being aspheric.