Optical Lens Distortion Control via Focal Ratio and Aspherical Geometry
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Solution Overview
Problem
Conventional optical lenses suffer from significant distortion, which adversely affects imaging quality and user experience.
Innovation Solution
The optical lens is designed with a specific arrangement of lenses, including a first lens with negative focal power, a second lens with negative focal power and aspherical surfaces, a third lens with positive focal power, and subsequent lenses, satisfying certain focal length ratios and optical distortion limits to minimize distortion and enhance imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional optical lenses are used with multiple lenses to reduce phase difference and chromatic aberration, then imaging quality is improved, but distortion becomes serious
Solution Approach 1:
The patent applies parameter changes by precisely controlling the focal length ratios between lenses (f2/f1 between -5 and 15, f5/f between -15 and 20) and using aspherical surfaces with inflection points to correct distortion while maintaining reduced aberrations. This resolves the contradiction by optimizing optical parameters to achieve both low distortion and high imaging quality.
Solution Approach 2:
The patent uses a composite lens system combining seven lenses with different focal powers (negative, positive, and aspherical) and different surface geometries (convex, concave, aspherical with inflection points). This composite structure allows simultaneous correction of chromatic aberration, phase difference, and distortion, resolving the contradiction between imaging quality and distortion control.
2Area of stationary object
If the field of view is enlarged, then the imaging coverage is improved, but the optical lens size increases
Solution Approach 1:
The patent employs aspherical surfaces with inflection points on the sixth lens to enable a larger field of view within a compact form factor. The aspherical geometry allows for improved light ray control and wider imaging coverage without proportionally increasing the overall lens volume, resolving the contradiction between field of view and size.
Solution Approach 2:
The patent optimizes the focal length ratio f2/f1 to be between -5 and 15, and controls the relationship tan(HFOV)×TTL/ImgH between 2.5 and 3.5, to achieve an enlarged field of view while maintaining a compact optical lens size. These parameter optimizations resolve the contradiction by mathematically balancing field of view expansion with size constraints.
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 effectively reduces optical distortion to less than 10%, improves imaging quality, and enlarges the field of view, thereby enhancing user experience and facilitating miniaturization of the optical lens.
Implementation Method 1
An optical lens in the related art includes a plurality of lenses. An arrangement of the plurality of lenses can better reduce phase difference and chromatic aberration
Implementation Method 2
an object side surface of the sixth lens and the image side surface of the sixth lens being aspherical, and at least one of the object side surface of the sixth lens and the image side surface of the sixth lens having at least one inflection point
Data Source
AI summary
An optical lens sequentially includes, from an object side to an image side, a first lens having a negative focal power, a second lens having a negative focal power; a third lens having a positive focal power, a fourth lens having a negative focal power, a fifth lens having a negative focal power, a sixth lens having a positive focal power, and a seventh lens having a negative focal power. The optical lens satisfies the following relation: −5<f2/f1<15, maximum optical distortion ≤10%. Where, f1 is a focal length of the first lens, and f2 is a focal length of the second lens.