Four-Element Lens Assembly Aberration Control
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Solution Overview
Problem
Conventional optical systems in portable electronic devices suffer from poor image quality due to uncontrolled incident light angles and inadequate light convergence, especially in compact designs with higher megapixels, leading to issues like spherical aberration and chromatic aberration.
Innovation Solution
A compact photographing optical lens assembly comprising four lens elements with specific refractive powers and surface curvatures, including a first convex, second negative with inflection, third aspheric, and fourth negative with aspheric surfaces, optimized to control axial distances and refractive power distribution, effectively suppressing light angles and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a conventional four-element lens structure with a concave image-side surface of the fourth lens element is used to reduce back focal length, then the optical system becomes more compact, but the incident angle of light projected onto the sensor cannot be suppressed, resulting in worse image quality
Solution Approach 1:
The patent changes the curvature parameter of the fourth lens element's image-side surface from concave to convex, which fundamentally alters the light path geometry. This parameter change enables both compact back focal length and effective suppression of incident light angles, resolving the contradiction between compactness and image quality
Solution Approach 2:
The patent employs a composite lens structure where the fourth lens element combines convex image-side surface with specific refractive power, creating a composite optical system that achieves both compact form factor and high image quality by synergistically managing light convergence and incident angle suppression
2Volume of moving object
If the optical system is designed for higher megapixels with compact size, then the device becomes more suitable for portable electronics, but light convergence is inadequate, leading to spherical aberration and chromatic aberration
Solution Approach 1:
The patent optimizes multiple parameters simultaneously: the refractive powers of all four lens elements, the axial distances between them, and the surface curvatures. These parameter changes enable the compact optical system to achieve adequate light convergence and suppress aberrations, maintaining high image quality in a small form factor
Solution Approach 2:
The patent utilizes aspheric surfaces on the third and fourth lens elements, replacing traditional spherical surfaces. This curvature modification enables better control of light rays, effectively reducing spherical aberration while maintaining compact size and high megapixel compatibility
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 enhances image quality by reducing spherical and chromatic aberrations, maintaining a compact size, and supporting high megapixel capabilities while controlling light convergence and aberrations, thus improving the overall performance of portable imaging devices.
Implementation Method 1
a first lens element (110), The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof
Implementation Method 2
The second lens element is with negative refractive power
Implementation Method 3
The third lens element with refractive power has an object-side surface being concave in a paraxial region thereof, wherein the object-side surface and an image-side surface of the third lens element are aspheric
Implementation Method 4
the object-side surface and the image-side surface of the fourth lens element being aspheric
Data Source
AI summary
A photographing optical lens assembly includes, in order form an object side to an image side, a first lens element, a second lens element, a third lens element, and a fourth lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region. The second lens element has negative refractive power. The third lens element with refractive power has an object-side surface being concave in a paraxial region, and the object-side surface and an image-side surface are both aspheric. The fourth lens element with negative refractive power has an object-side surface being concave in a paraxial region, and an image-side surface being convex in a paraxial region, the object-side surface and the image-side surface are both aspheric.