Five-Lens Camera Module with Aspheric Surfaces for Chromatic Aberration Correction

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Solution Overview

Problem

Existing camera lenses with five pieces, as described in prior patents, suffer from insufficient refractive power distribution and shape issues, leading to inadequate ultra-thin designs with uncorrected chromatic aberration, particularly in the first and third lenses.

Innovation Solution

A camera lens composed of five lenses with specific refractive power distributions and aspheric shapes, including a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with positive refractive power, and a fifth lens with negative refractive power, along with a glass plate or optical filter, optimized to meet conditions that ensure ultra-thin design and effective chromatic aberration correction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If five piece lenses are used with conventional refractive power distribution, then chromatic aberration correction is improved, but lens thickness and TTL/LH ratio cannot be reduced sufficiently

Engineering Contradiction:

Improvechromatic aberration correctionVSAvoidlens thickness and TTL/LH ratio

Core Design Contradiction:

ReliabilityVSLength of moving object

Solution Approach 1:

The patent applies parameter changes by optimizing the refractive power distribution across the five lenses with specific conditional expressions (0.35<f1/f<0.65, -1.20<f2/f<-0.80, 0.80<f3/f<1.50, etc.) and using aspheric surfaces with specific curvature radii relationships. This allows achieving both ultra-thin design (TTL/LH<1.60) and sufficient chromatic aberration correction simultaneously, resolving the contradiction between thickness reduction and optical performance maintenance.

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If first lens shape is conventional with insufficient refractive power, then manufacturing is simplified, but optical performance and chromatic aberration correction deteriorate

Engineering Contradiction:

Improvelens shaping simplicityVSAvoidoptical performance and chromatic aberration correction

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent employs aspheric surfaces for the first lens with specific curvature radius relationships (R1>0, R2<0, and |(R1+R2)/(R1-R2)|<1.00). This aspheric design enables better chromatic aberration correction and optical performance while maintaining manufacturability through well-defined geometric parameters, resolving the contradiction between manufacturing simplicity and optical performance.

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Device complexity

If second and third lenses have insufficient refractive power distribution, then device complexity is reduced, but ultra-thin design capability is compromised

Engineering Contradiction:

Improverefractive power distribution complexityVSAvoidlens system thickness

Core Design Contradiction:

Device complexityVSLength of moving object

Solution Approach 1:

The patent optimizes the refractive power distribution of the second and third lenses through specific conditional expressions (-1.20<f2/f<-0.80 for the second lens and 0.80<f3/f<1.50 for the third lens). This parameter optimization enables ultra-thin design (TTL/LH<1.60) while maintaining manageable device complexity through well-defined refractive power relationships among the lenses.

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 results in an ultra-thin camera lens with excellent optical properties and sufficient chromatic aberration correction, as demonstrated by the specified focal distances, curvature radii, and aspheric coefficients, achieving a thin-to-image height ratio suitable for advanced camera applications.