Eight Element Aspheric Lens System Aberration Correction

Solution Overview

Problem

Conventional optical systems in portable electronic devices face challenges in achieving both high image quality and compact size, particularly in meeting the demands of high-resolution, large aperture, and wide field of view requirements.

Innovation Solution

A photographing optical lens system comprising eight lens elements with specific refractive powers and surface shapes, including aspheric surfaces, arranged with air gaps between adjacent elements to optimize image quality and compactness, featuring a configuration that includes a first lens element with positive refractive power, a second lens element with positive refractive power, and an eighth lens element with both convex and concave surfaces, among others, to correct aberrations and reduce the total track length.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a lens structure with fewer lens elements is adopted, then the device complexity is reduced and manufacturing is easier, but the image quality and resolution cannot satisfy high-end requirements

Engineering Contradiction:

Improveease of manufactureVSAvoidimage quality

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The optical system is divided into 8 separate lens elements with air gaps between them, allowing each element to be optimized independently for specific aberration correction while maintaining overall system manufacturability through modular assembly

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs aspheric surfaces with specific conic coefficients (k values) and precise curvature radii for each lens element, changing the geometric parameters to achieve superior image quality while controlling manufacturing complexity through standardized aspheric manufacturing processes

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If the aperture is increased to improve resolution, then the image quality improves, but the optical system size increases making it non-compact

Engineering Contradiction:

ImproveresolutionVSAvoidoptical system size

Core Design Contradiction:

Manufacturing precisionVSVolume of moving object

Solution Approach 1:

The patent utilizes the air gap dimension between lens elements to accommodate the optical path length required for high aperture ratios, allowing the system to maintain compactness in the longitudinal direction while achieving large aperture through careful arrangement of 8 lens elements with specific spacing

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

Aspheric surfaces with optimized conic coefficients are used on multiple lens elements to correct optical aberrations introduced by large aperture, enabling high resolution without increasing the overall optical system size

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Adaptability or versatility

If the field of view is widened to capture more scene, then the adaptability improves, but the optical system becomes more complex and less compact

Engineering Contradiction:

Improvefield of viewVSAvoidoptical system complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The optical system is divided into 8 separate lens elements with air gaps between them, allowing each element to be optimized independently for specific aberration correction while maintaining overall system manufacturability through modular assembly

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs aspheric surfaces with specific conic coefficients (k values) and precise curvature radii for each lens element, changing the geometric parameters to achieve superior image quality while controlling manufacturing complexity through standardized aspheric manufacturing processes

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 balances image quality and compact size, improving resolution and field of view while maintaining a compact form factor, suitable for high-end mobile devices and electronic imaging applications.

Implementation Method 1

a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element and an eighth lens element... both an object-side surface and the image-side surface of the eighth lens element are aspheric

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS20240288668A1Photographing optical lens system, image capturing unit and electronic device

Publication Date: 2024.08.29 LARGAN PRECISION

AI summary

A photographing optical 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, a sixth lens element, a seventh lens element and an eighth lens element. The second lens element has positive refractive power. The eighth lens element has an image-side surface being concave in a paraxial region thereof, wherein the image-side surface of the eighth lens element has at least one convex shape in an off-axis region thereof, and both an object-side surface and the image-side surface thereof are aspheric. The photographing optical lens system has a total of eight lens elements. An air gap in a paraxial region is located between every two lens elements of the photographing optical lens system that are adjacent to each other.