Five-Lens Optical Camera Lens for Low Total Track Length

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Solution Overview

Problem

Conventional five-lens camera lens structures fail to meet the requirements for low total track length and large aperture, leading to inadequate imaging quality in miniaturized camera devices with reduced pixel areas.

Innovation Solution

A five-lens optical camera lens design with specific refractive power configurations and materials, including a first lens with positive refraction, a second lens with negative refraction, a third lens made of glass, and fourth and fifth lenses with negative refraction, optimized to control total track length and correct aberrations, while using aspheric surfaces to reduce the number of lenses and enhance imaging quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a traditional three-lens or four-lens structure is used, then the device complexity is reduced, but the imaging quality deteriorates when pixel area is reduced

Engineering Contradiction:

Improvelens structure complexityVSAvoidimaging quality

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent combines multiple lens functions into a five-lens structure where each lens contributes to both imaging quality and system compactness. The first lens (positive power) and second lens (negative power) work together to control light paths, while the third lens (negative power) and fourth lens (positive power) correct aberrations, and the fifth lens (negative power) fine-tunes the optical path. This merging of functions allows achieving high imaging quality with a compact design suitable for reduced pixel areas.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent employs specific parameter configurations including focal lengths (f1=2.881mm, f2=-7.033mm, f3=-50.546mm, f4=2.337mm, f5=-1.948mm), refractive indices (nd1=1.544, nd2=1.651, nd3=1.689, nd4=1.544, nd5=1.535), and Abbe numbers (vd1=56.04, vd2=21.51, vd3=31.30, vd4=56.04, vd5=56.12) to optimize the five-lens structure. These parameter changes enable the system to achieve low total track length (4.4mm) and large aperture (F/2.08) while maintaining excellent imaging quality.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If a five-lens structure is used to improve imaging quality, then the imaging quality is improved, but the total track length increases

Engineering Contradiction:

Improveimaging qualityVSAvoidtotal track length

Core Design Contradiction:

Manufacturing precisionVSLength of moving object

Solution Approach 1:

The patent utilizes aspheric surfaces on multiple lens elements to control light paths more efficiently than spherical surfaces. The aspheric design allows for better aberration correction and enables the five-lens structure to achieve a compact total track length of 4.4mm while maintaining high imaging quality. The aspheric coefficients are specifically optimized to minimize the axial length required for the optical system.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The patent employs specific parameter configurations including focal lengths (f1=2.881mm, f2=-7.033mm, f3=-50.546mm, f4=2.337mm, f5=-1.948mm) and optical power distributions that enable the five-lens structure to achieve low total track length (4.4mm) while maintaining large aperture (F/2.08) and excellent imaging quality.

Inventive Principle:

Principle #35Parameter changes

3Use of energy by moving object

If a five-lens structure with large aperture is designed, then the sensitivity is improved, but the device complexity increases

Engineering Contradiction:

ImprovesensitivityVSAvoidlens structure complexity

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The patent segments the optical system into five distinct lens elements with specific functions: the first lens (positive power) for initial light convergence, the second lens (negative power) for divergence and path control, the third lens (negative power) for aberration correction, the fourth lens (positive power) for focal adjustment, and the fifth lens (negative power) for final path optimization. This segmentation allows each element to be optimized for specific functions, achieving large aperture (F/2.08) and high sensitivity while managing complexity through functional specialization.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs specific parameter configurations including refractive indices (nd1=1.544, nd2=1.651, nd3=1.689, nd4=1.544, nd5=1.535) and Abbe numbers (vd1=56.04, vd2=21.51, vd3=31.30, vd4=56.04, vd5=56.12) to optimize the five-lens structure for large aperture (F/2.08) and high sensitivity performance.

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 design achieves a shorter total track length, improved sensitivity, and better imaging performance, suitable for high-pixel portable devices with a large aperture, effectively addressing the limitations of conventional lens structures.