Six-Element Imaging Lens Design for Compact High-Resolution Optics

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Solution Overview

Problem

Existing imaging lenses for devices like cell phones and smartphones face challenges in achieving a small F-number, increased angle of view, and reduced overall lens length while maintaining high pixilation and imaging performance, especially with larger image sensors.

Innovation Solution

A six-element imaging lens configuration with specific refractive power and curvature conditions for each lens element, including a positive first lens, negative second lens, positive third and fourth lenses, negative fifth lens, and negative sixth lens, optimized to satisfy certain conditional expressions for focal lengths and radii of curvature, allowing for a compact design with improved optical performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the number of lens elements is increased to improve imaging performance, then imaging quality is improved, but overall lens length increases

Engineering Contradiction:

Improveimaging performanceVSAvoidoverall lens length

Core Design Contradiction:

Manufacturing precisionVSLength of stationary object

Solution Approach 1:

The patent applies parameter changes by optimizing the refractive indices and Abbe numbers of each lens element within specific ranges (1.45<Nd1<1.70, 20<νd1<60, etc.). This allows the six-element lens to achieve high imaging performance while maintaining a compact overall length of 4.35mm, resolving the contradiction between performance and size.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The imaging lens is divided into six distinct lens elements with specific positive and negative refractive powers arranged in a particular sequence. This segmentation allows each element to contribute differently to the overall optical performance, achieving high-quality imaging while keeping the total length compact through optimized distribution of optical functions.

Inventive Principle:

Principle #1Segmentation

2Manufacturing precision

If the F-number is reduced to improve light gathering capability, then imaging performance is improved, but lens complexity increases

Engineering Contradiction:

Improveimaging performanceVSAvoidlens complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent achieves a small F-number of 1.68 through parameter changes by carefully selecting the refractive indices and curvatures of the six lens elements. The specific parameter ranges (e.g., -0.60<f2/f<−0.25, 0.40<f3/f<0.70) enable high light-gathering capability while maintaining manageable lens complexity.

Inventive Principle:

Principle #35Parameter changes

3Area of stationary object

If the angle of view is increased to capture wider scenes, then imaging coverage is improved, but optical aberration control becomes more difficult

Engineering Contradiction:

Improveangle of viewVSAvoidoptical aberration control

Core Design Contradiction:

Area of stationary objectVSManufacturing precision

Solution Approach 1:

The patent achieves a wide angle of view of 75.6 degrees while controlling optical aberrations through parameter changes in the lens design. The specific curvature and refractive index ranges of the six elements are optimized to maintain high imaging performance across the wide field of view, resolving the contradiction between coverage and aberration control.

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 configuration achieves a reduction in overall lens length, an increase in angle of view, and a small F-number, enabling high pixilation and high imaging performance from central to peripheral angles of view, supporting high-resolution image capture.