Six-Element Aspheric Lens System for Wide Field of View

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Solution Overview

Problem

Conventional optical systems in portable electronic devices suffer from a narrow field of view and insufficient aberration correction, resulting in subpar image quality, particularly in high-end mobile devices that require compact, high-resolution, and high-quality imaging.

Innovation Solution

A photographing lens system comprising six lens elements with specific refractive powers and aspheric surfaces, including a first lens element with an inflection point, a second lens element with positive refractive power, a third lens element with negative refractive power, a fourth lens element with positive refractive power, a fifth lens element with negative refractive power, and a sixth lens element with a concave image-side surface and at least one inflection point, arranged to optimize focal length, curvature radii, and refractive indices for improved image quality and field of view.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If a lens structure with fewer lens elements is adopted, then the device size is reduced, but the field of view becomes narrow and aberration correction is insufficient

Engineering Contradiction:

Improvedevice sizeVSAvoidfield of view

Core Design Contradiction:

Volume of moving objectVSAdaptability or versatility

Solution Approach 1:

The patent divides the optical system into six distinct lens elements with specific refractive powers and surface curvatures. Each lens element is designed with particular aspheric coefficients to perform specific optical functions, collectively achieving wide field of view and aberration correction while maintaining compact size

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs aspheric surfaces on multiple lens elements (first, third, fourth, fifth, and sixth lens elements) with specifically designed aspheric coefficients. This curvature variation enables effective aberration correction and expands the field of view without increasing the overall device volume

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Volume of moving object

If a lens structure with fewer lens elements is adopted, then the device size is reduced, but image quality deteriorates due to insufficient aberration correction

Engineering Contradiction:

Improvedevice sizeVSAvoidimage quality

Core Design Contradiction:

Volume of moving objectVSManufacturing precision

Solution Approach 1:

Different lens elements are assigned specific local optical properties: the second lens element provides positive refractive power for convergence, while the third and fifth lens elements provide negative refractive power for divergence. Each element has tailored aspheric coefficients to correct specific aberrations at different positions in the optical path, achieving high image quality in a compact design

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent optimizes multiple parameters including refractive powers of individual lens elements, curvature radii of object-side and image-side surfaces, thicknesses of lens elements, and aspheric coefficients. These parameter adjustments enable effective aberration correction and high image quality while maintaining a compact device size

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If six lens elements with aspheric surfaces are used, then field of view and image quality are improved, but the total track length increases

Engineering Contradiction:

Improvefield of viewVSAvoidtotal track length

Core Design Contradiction:

Adaptability or versatilityVSLength of moving object

Solution Approach 1:

The patent employs an aperture stop positioned between the first and second lens elements to dynamically control the light path and effective field of view. This allows the system to achieve wide field of view performance when needed while maintaining a compact total track length through optimized lens element spacing and curvature

Inventive Principle:

Principle #15Dynamics

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 lens system achieves a wide field of view and high image quality by effectively correcting aberrations, reducing the total track length, and balancing refractive power distribution, while maintaining a compact size suitable for electronic devices.

Implementation Method 1

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS9651759B2Photographing lens system, image capturing unit and electronic device

Publication Date: 2017.05.16 LARGAN PRECISION

AI summary

A photographing lens system includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The second lens element has positive refractive power. The third lens element has a concave image-side surface, wherein both object-side and image-side surfaces thereof are aspheric. The fourth lens element has a convex image-side surface, wherein both object-side and image-side surfaces thereof are aspheric. The fifth lens element has negative refractive power, wherein both object-side and image-side surfaces thereof are aspheric. The sixth lens element has a concave image-side surface, wherein both object-side and image-side surfaces thereof are aspheric, and at least one of the two surfaces thereof has at least one inflection point. The photographing lens system has a total of six lens elements.