Six-Element Vehicle Lens Assembly Aberration Correction
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Solution Overview
Problem
Conventional optical systems in vehicle recording cameras have poor resolving power, image distortion, and insufficient illumination, particularly in peripheral regions, due to their limited number of lens elements and unfavorable refractive power distribution.
Innovation Solution
A compact image capturing lens assembly comprising six lens elements with specific refractive powers and surface shapes, including aspheric surfaces, is designed to improve image quality by optimizing refractive power distribution and reducing aberrations, with at least three lens elements made of plastic material to reduce manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional optical systems with five or less lens elements are used, then device complexity is reduced, but resolving power deteriorates
Solution Approach 1:
The optical system is divided into six distinct lens elements with specific refractive powers arranged in sequence. This segmentation allows each lens element to contribute to correcting specific aberrations, thereby improving resolving power while maintaining a manageable system complexity
Solution Approach 2:
Different lens elements are assigned specific refractive powers (positive or negative) and surface shapes (convex or concave) to address local optical quality issues. For example, the first lens element with negative refractive power and concave image-side surface specifically addresses certain aberrations, while the fourth lens element with positive refractive power addresses others, thereby improving overall resolving power through localized optimization
2Device complexity
If conventional lens element arrangements are used, then device complexity is reduced, but image distortion in peripheral region deteriorates
Solution Approach 1:
The patent applies local quality by assigning specific surface shapes (convex or concave) and refractive powers to different lens elements based on their positions in the optical path. This localized optimization of optical properties enables effective correction of peripheral image distortion without requiring overly complex system architecture
Solution Approach 2:
The patent utilizes aspheric surfaces on multiple lens elements (specifically the fourth, fifth, and sixth lens elements) to correct spherical aberration and improve image quality in peripheral regions. The aspheric surfaces provide continuous curvature variation that better matches the ideal optical path compared to spherical surfaces, thereby reducing image distortion
3Device complexity
If conventional lens element arrangements are used, then device complexity is reduced, but illumination in peripheral region deteriorates
Solution Approach 1:
The patent optimizes peripheral illumination by carefully designing the refractive power and surface shape of each lens element. The combination of positive and negative refractive powers across the six lens elements, along with specific convex/concave surface configurations, directs light more effectively to peripheral regions of the image plane, improving illumination uniformity without increasing system complexity
4Manufacturing precision
If aspheric surfaces and multiple lens elements are used, then image quality is improved, but manufacturing cost deteriorates
Solution Approach 1:
The patent employs aspheric surfaces on the fourth, fifth, and sixth lens elements to correct spherical aberration and improve image quality. Aspheric surfaces provide continuous curvature variation that better corrects optical aberrations compared to spherical surfaces, thereby improving image quality through parameter optimization
Solution Approach 2:
The patent specifies that at least three of the six lens elements are made of plastic material rather than glass. Plastic lens elements are generally cheaper to manufacture, especially when injection molding is used for aspheric surfaces. This material substitution reduces manufacturing cost while maintaining acceptable optical performance through proper design
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 correcting astigmatism, spherical aberration, and improving peripheral illumination, while maintaining a compact design suitable for vehicle recording cameras.
Implementation Method 1
A first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, and a sixth lens element are disposed in order from an object side to an image side. The first lens element with negative refractive power, the second lens element with refractive power, the third lens element with refractive power, the fourth lens element with positive refractive power, the fifth lens element with negative refractive power, and the sixth lens element with refractive power
Data Source
AI summary
An image capturing lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, and a sixth lens element. The first lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof. The second and third lens elements have refractive power. The fourth lens element has positive refractive power. The fifth lens element with negative refractive power has an object-side surface being concave in a paraxial region thereof. The sixth lens element with refractive power has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof. The image capturing lens assembly has a total of six lens elements with refractive power.