Five-Lens Imaging Module with Movable First Element for Aberration Control

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Solution Overview

Problem

Existing camera modules with five-piece lenses fail to achieve optimal optical and aberration characteristics, necessitating a new power structure for high-resolution imaging lenses.

Innovation Solution

A five-lens configuration where the first lens has positive refractive power, the second and fourth lenses have negative refractive power, and the third lens has positive refractive power, with specific Abbe's numbers and air clearances to optimize aberration correction and compactness, allowing for auto focusing by moving the first lens.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a five-piece lens configuration with mixed positive and negative refractive powers is used, then the imaging resolution can be improved, but the optical and aberration characteristics deteriorate

Engineering Contradiction:

Improveimaging resolutionVSAvoidoptical and aberration characteristics

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent applies parameter changes by optimizing the refractive powers, Abbe numbers, and air clearances of each lens element. Specifically, it sets the first lens with positive refractive power and high Abbe number (V1>50), the second lens with negative refractive power and low Abbe number (V2<30), the third lens with positive refractive power and low Abbe number (V3<30), and the fourth lens with positive refractive power and high Abbe number (V4>50). This systematic parameter optimization resolves the contradiction by achieving both high resolution and good aberration characteristics through carefully controlled optical parameters rather than simply adding more lens elements.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If multiple lens elements with different refractive powers are combined, then the imaging performance can be enhanced, but the device complexity increases

Engineering Contradiction:

Improveimaging performanceVSAvoidlens structure complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies local quality by assigning specific functional characteristics to each lens element position. The first lens (positive, high Abbe) primarily corrects chromatic aberration, the second lens (negative, low Abbe) corrects spherical aberration, the third lens (positive, low Abbe) provides additional spherical aberration correction, and the fourth lens (positive, high Abbe) provides final chromatic aberration correction. This localized functional assignment optimizes the overall imaging performance while maintaining a manageable four-element structure, resolving the contradiction between performance enhancement and complexity control.

Inventive Principle:

Principle #3Local quality

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

This configuration enables a compact and high-resolution imaging lens system with improved aberration correction and optical performance, as demonstrated by reduced coma aberrations and enhanced Modulation Transfer Function characteristics across various zoom positions.