Five-Element Imaging Lens Assembly for Wide Angle and Compact Track
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Solution Overview
Problem
Existing lens systems in electronic devices struggle to concurrently achieve wide angles of view and short total track lengths, leading to unsatisfactory image quality due to excessive stray light and mechanical limitations.
Innovation Solution
An imaging lens assembly comprising five lens elements with specific refractive powers and surface curvatures, including a first lens element with negative power, a second with positive convex surfaces, a third with inflection points, a fourth with concave and convex surfaces, and a fifth with negative refractive power and aspheric surfaces, optimized to distribute refractive power and correct aberrations for a wider field of view and reduced stray light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the lens system is configured for wide angles of view and large apertures, then the field of view is improved, but the total track length cannot be shortened
Solution Approach 1:
The lens system is divided into five separate lens elements (first lens element, second lens element, third lens element, fourth lens element, and fifth lens element) with different refractive powers and surface curvatures. This segmentation allows each element to be optimized for specific functions: the first element provides negative refractive power for wide angle, the second and fourth elements provide positive refractive power for focusing, and the fifth element corrects aberrations, thereby achieving both wide field of view and compact total track length
Solution Approach 2:
The patent applies specific parameter conditions to optimize the lens system: the axial distance between the first and second lens elements is set to be the largest among all adjacent lens element pairs, and specific relationships between focal lengths (f1, f3) and curvature radii (R1, R2, R3, R4) are established. These parameter optimizations enable the lens system to achieve wide angles of view while maintaining a short total track length
2Device complexity
If the lens system uses conventional configurations, then the structure is simple, but stray light is excessive and image quality is unsatisfactory
Solution Approach 1:
Each lens element is designed with specific local characteristics: the first lens element has negative refractive power with aspheric surfaces, the second and fourth elements have positive refractive power with specific convex/concave surface combinations, and the fifth element has negative refractive power with aspheric surfaces. These localized quality differences allow the system to control light paths precisely and reduce stray light while maintaining reasonable structural complexity
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements (first, third, and fifth lens elements) instead of traditional spherical surfaces. The aspheric curvature allows for better control of light rays at oblique angles, reducing stray light and improving image quality while maintaining a relatively simple five-element structure
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 enables a compact imaging lens assembly with improved image quality, reduced stray light, and enhanced field of view, suitable for various electronic devices, including smartphones and surveillance cameras.
Implementation Method 1
a first lens element having negative refractive power; a second lens element with positive refractive power; a third lens element; a fourth lens element with positive refractive power; and a fifth lens element with negative refractive power
Data Source
AI summary
An imaging lens assembly, including, in order from an object side to an image side: a first lens element having negative refractive power; a second lens element with positive refractive power having an image-side surface being convex; a third lens element, a fourth lens element with positive refractive power having an object-side surface being concave and an image-side surface being convex; a fifth lens element with negative refractive power having an image-side surface being concave, at least one convex shape on the image-side surface in an off-axial region, and both of object-side and image-side surfaces thereof being aspheric; wherein the imaging lens assembly has a total of five lens elements.