Aspheric Lens Assembly Aberration Correction

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Solution Overview

Problem

Conventional compact imaging lens systems face challenges in achieving high image quality while maintaining a compact form, as they either have limited aberration correction capabilities or require a longer total track length to accommodate additional lens elements.

Innovation Solution

A photographing optical lens assembly comprising three aspheric lens elements with specific refractive powers and surface curvatures, including a stop between the object and the first lens element, which effectively corrects aberrations and reduces the total track length, ensuring good image quality and compactness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If two lens elements are employed to reduce production cost, then manufacturing cost is reduced, but the capability to correct aberrations becomes insufficient

Engineering Contradiction:

Improveproduction costVSAvoidaberration correction capability

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent changes the parameters of the lens elements by introducing aspheric surfaces with specific curvature radii and conic constants, allowing three lens elements to achieve aberration correction capability equivalent to or exceeding more elements, while maintaining compact size and reasonable manufacturing cost

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite optical design combining spherical and aspheric surfaces in specific configurations, where the aspheric surfaces act as advanced optical materials that provide superior aberration correction compared to traditional spherical surfaces alone

Inventive Principle:

Principle #40Composite materials

2Manufacturing precision

If excess number of lens elements are employed to correct aberrations, then image quality is improved, but the total track length of the lens becomes difficult to reduce

Engineering Contradiction:

Improveimage qualityVSAvoidtotal track length

Core Design Contradiction:

Manufacturing precisionVSLength of moving object

Solution Approach 1:

The patent employs aspheric surfaces with optimized curvature radii and conic constants that enable stronger aberration correction per unit length, allowing effective image quality improvement without proportionally increasing the total track length

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses aspheric surfaces instead of spherical surfaces, where the variable curvature along the aperture provides enhanced aberration correction capability in a more compact configuration, reducing the total track length compared to traditional spherical lens designs

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Manufacturing precision

If triplet type optical lens system is employed to correct aberrations, then aberration correction capability is improved, but the total track length increases and compact form cannot be maintained

Engineering Contradiction:

Improveaberration correction capabilityVSAvoidtotal track length

Core Design Contradiction:

Manufacturing precisionVSLength of moving object

Solution Approach 1:

The patent introduces aspheric surfaces to the triplet lens system, where the variable curvature provides superior aberration correction that allows for more compact spacing between elements, thereby reducing the total track length while maintaining or enhancing the aberration correction capability of the traditional triplet configuration

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The patent optimizes the parameters of the triplet system by incorporating aspheric coefficients and specific curvature radii ratios, enabling the system to achieve better aberration correction in a more compact form factor compared to conventional spherical triplet designs

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 provides improved image quality by effectively correcting aberrations and reducing the total track length, maintaining the compactness of the lens system while enhancing photosensitivity and reducing the probability of shading in electronic sensors.

Implementation Method 1

a first lens element with positive refractive power having a convex object-side surface and a concave image-side surface; a second lens element with negative refractive power having a concave object-side surface and a convex image-side surface

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS8000033B1Photographing optical lens assembly

Publication Date: 2011.08.16 LARGAN PRECISION

AI summary

The present invention provides a photographing optical lens assembly comprising, in order from an object side to an image side: a first lens element with positive refractive power having a convex object-side surface and a concave image-side surface; a second lens element with negative refractive power having a concave object-side surface and a convex image-side surface, the object-side and image-side surfaces thereof being aspheric; and a third lens element with negative refractive power having a convex object-side surface and a concave image-side surface, the object-side and image-side surfaces thereof being aspheric and at least one inflection point being formed on the image-side surface, wherein the lens assembly is further provided with a stop disposed between an object and the first lens element.