Three-Element Lens System with Aspheric Inflection Points
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Solution Overview
Problem
Conventional compact imaging lenses for mobile phone cameras face challenges in achieving high image quality while maintaining a compact form and reducing total track length, due to limited aberration correction capabilities and increased complexity with additional lens elements.
Innovation Solution
A photographing lens system comprising three lens elements with specific refractive powers and surface profiles, including a first lens with positive refractive power, a second lens with negative refractive power, and a third lens with aspheric surfaces and inflection points, along with an aperture stop placement to correct aberrations and reduce the total track length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If two lens elements are used to reduce production cost, then manufacturing cost is reduced, but aberration correction capability is insufficient
Solution Approach 1:
The patent applies local quality by assigning different refractive power characteristics to different lens elements. The first lens element has positive refractive power for compactness, while the second lens element has negative refractive power specifically for aberration correction. This localized functional differentiation allows a three-element system to achieve both compactness and superior aberration correction compared to conventional two-element designs.
2Manufacturing precision
If excess number of lens elements is employed to improve image quality, then aberration correction is improved, but total track length increases
Solution Approach 1:
The patent employs parameter changes by precisely controlling the refractive powers of the lens elements. Specifically, it sets the product of the first lens element's focal length and the second lens element's focal length to be less than zero (f1×f2<0), creating a specific optical configuration that enables compact total track length while maintaining excellent aberration correction and image quality.
3Ease of manufacture
If spherical glass lens is used as the third lens element, then manufacturing is simplified, but freedom in correcting off-axis aberrations is reduced
Solution Approach 1:
The patent applies composite materials by combining lens elements with different refractive power characteristics and material properties. The first lens element has positive refractive power while the second lens element has negative refractive power, creating a composite optical system that achieves both compactness and superior aberration correction, overcoming the limitations of using only spherical glass lens elements.
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 corrects aberrations, improves image quality, and maintains a compact form, enabling better image sensitivity and a wide field of view, suitable for compact portable electronic devices.
Implementation Method 1
a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power
Data Source
AI summary
A photographing lens system including, in order from an object side to an image side: a first positive lens element having a convex object-side surface and a convex image-side surface; a second negative lens element, the object-side and image-side surfaces thereof being aspheric; a third lens element having a convex object-side surface and a concave image-side surface, the object-side and image-side surfaces thereof being aspheric and at least one of which being provided with at least one inflection point; and an aperture stop disposed between an imaged object and the second lens element; wherein there are three lens elements with refractive power.