Five-Lens Optical Imaging Assembly for Wide Field-of-View and Low Distortion
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Solution Overview
Problem
Optical imaging lens assemblies face challenges in achieving miniaturization and high image quality while maintaining a wide field-of-view, as increasing the number of lenses leads to larger size and increased off-axis aberration, which complicates the correction of distortions and reduces image quality.
Innovation Solution
A five-piece optical imaging lens assembly is designed with specific refractive powers, surface shapes, and spacings, including a first lens with negative refractive power, a second lens with positive refractive power, a third lens with convex object-side surfaces, a fourth lens with positive refractive power, and a fifth lens with negative refractive power, optimized to achieve a large field-of-view, low distortion, and high image quality by controlling focal lengths, radii of curvature, and thicknesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of lenses is increased to meet wide-angle requirements, then the field-of-view is improved, but the size and weight of the lens assembly increase
Solution Approach 1:
The patent combines multiple lens functions into a compact five-lens assembly where each lens contributes to both wide-angle coverage and aberration correction. The specific configuration merges the functions of wide-angle collection and distortion correction into a unified structure that achieves 100°-125° field-of-view without requiring a larger number of lenses, thus resolving the contradiction between field-of-view and lens assembly size.
Solution Approach 2:
The patent optimizes key parameters including focal lengths (f1-R1≥0.7, f2345/f2≥0.5), radii of curvature (R10/f5≤-0.7), and thickness ratios (CT5/ET5≥0.2) to achieve superior optical performance. By carefully adjusting these parameters, the system achieves wide-angle coverage with minimal lens count, resolving the contradiction between field-of-view and compact size.
2Adaptability or versatility
If the number of lenses is increased to meet wide-angle requirements, then the field-of-view is improved, but the off-axis aberration increases sharply
Solution Approach 1:
The patent applies different surface shapes and refractive powers to specific lenses at specific positions. The first lens has negative refractive power with concave surfaces for wide-angle light collection, while subsequent lenses have positive refractive power with convex surfaces for aberration correction. This localized optimization of optical properties enables effective correction of off-axis aberrations across the entire field-of-view.
Solution Approach 2:
The patent uses a composite lens structure with alternating positive and negative refractive power lenses (negative-positive-positive-positive-negative configuration). This composite arrangement creates a balanced optical system where the negative lenses control field curvature and the positive lenses correct distortion and aberrations, achieving superior off-axis performance across 100°-125° field-of-view.
3Object-generated harmful factors
If the incident height of light is increased to correct off-axis aberrations, then the off-axis aberration is reduced, but the lens size increases
Solution Approach 1:
The patent optimizes the ratio of effective focal length to radius of curvature (f1/R1≥0.7) and controls the thickness-to-diameter ratios (CT5/ET5≥0.2, CT1/T12≥0.1) to achieve effective aberration correction with compact lens dimensions. By adjusting these geometric parameters, the system corrects off-axis aberrations without requiring large incident light heights, thus resolving the contradiction between aberration correction and lens size.
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 configuration allows for a compact, high-quality optical imaging lens assembly with a field-of-view between 100° and 125°, optical distortion less than 5%, and improved image quality, suitable for portable electronic products.
Implementation Method 1
a first lens having refractive power, a concave object-side surface and a concave image-side surface; a second lens having positive refractive power
Data Source
AI summary
The present disclosure discloses an optical imaging lens assembly including, sequentially from an object side to an image side along an optical axis, a first lens having refractive power, a concave object-side surface and a concave image-side surface; a second lens having positive refractive power; a third lens having refractive power and a convex object-side surface; a fourth lens having positive refractive power; and a fifth lens having negative refractive power. An effective focal length f1 of the first lens and a radius of curvature R1 of the object-side surface of the first lens satisfy 0.7≤f1/R1<1.5.