Six-Lens Imaging System with +−+++− Power Distribution

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Solution Overview

Problem

Portable electronic device imaging lenses face challenges in miniaturization while maintaining high imaging quality, particularly due to large aperture values that fail to ensure adequate performance in low-light conditions.

Innovation Solution

The design of an imaging lens comprising multiple lenses with specific refractive powers and shapes, including a first lens with positive refractive power, a second lens with negative refractive power, and a fifth lens with positive refractive power, optimized by conditions such as focal length ratios and thickness constraints, to achieve miniaturization and high imaging quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the imaging lens is miniaturized, then the size is reduced, but the aperture value becomes large and imaging quality deteriorates

Engineering Contradiction:

Improveimaging lens sizeVSAvoidimaging quality

Core Design Contradiction:

Volume of moving objectVSManufacturing precision

Solution Approach 1:

The imaging lens is divided into six separate lens elements with different refractive powers and surface configurations. This segmentation allows each lens to contribute differently to the overall optical performance, enabling miniaturization while maintaining imaging quality through coordinated design of individual elements.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the lens system have different properties - the first lens has positive refractive power with specific convex/concave surfaces, the second has negative refractive power, and subsequent lenses have varying characteristics. This local differentiation optimizes light control at different positions and depths, achieving both small size and high aperture performance.

Inventive Principle:

Principle #3Local quality

2Illumination intensity

If the aperture value is large, then more light is captured, but the lens size increases

Engineering Contradiction:

Improvelight capture capabilityVSAvoidlens size

Core Design Contradiction:

Illumination intensityVSVolume of moving object

Solution Approach 1:

The lens elements utilize curved surfaces with specific radii of curvature (R1, R2, R3, R4, etc.) to focus and control light. The aspheric surfaces and varying curvatures enable efficient light gathering and focusing in a compact configuration, achieving large aperture effect without proportional size increase.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The patent specifies precise parameter ranges for lens thicknesses (CT1, CT2, CT3, CT4, CT5), focal lengths (f1, f2, f3, f4, f5), and curvature radii. By optimizing these parameters within defined ranges, the system achieves large aperture capability while maintaining miniaturized dimensions through mathematical optimization of optical paths.

Inventive Principle:

Principle #35Parameter changes

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 effectively reduces the total size of the imaging lens while maintaining a large aperture and high imaging quality, enhancing performance in low-light conditions and improving user experience for portable electronic devices.

Implementation Method 1

The first lens with positive refractive power includes a convex object side surface and a concave image side surface. The second lens with negative refractive power includes a convex object side surface and a concave image side surface.

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS11372209B2Imaging lens and electronic device including six lenses of +−+++− refractive powers

Publication Date: 2022.06.28 JIANGXI LIANYI OPTICS CO LTD

AI summary

The disclosure provides an imaging lens. The imaging lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. The first lens with positive refractive power includes a convex object side surface and a concave image side surface. The second lens with negative refractive power includes a convex object side surface and a concave image side surface. The third lens with positive refractive power includes a convex object side surface and a convex image side surface in a paraxial region of the third lens. The fourth lens with a positive refractive power includes a concave object side surface and a convex image side surface. The fifth lens has positive refractive power. The sixth lens with negative refractive power includes a concave object side surface and a concave image side surface in a paraxial region of the sixth lens.