Five-Lens Optical Module for Thin Mobile Imaging

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Solution Overview

Problem

High-resolution lens modules with multiple lenses face challenges in miniaturization due to increased optical system length, making them difficult to mount in thin mobile communications terminals.

Innovation Solution

A lens module design incorporating specific refractive power and curvature relationships among five lenses, including a first lens with negative refractive power, a second lens with positive refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power, and a fifth lens with negative refractive power and inflection points, optimized to satisfy certain conditional expressions for improved aberration correction and miniaturization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a high-resolution optical system is configured using multiple lenses, then imaging resolution is improved, but the length of the optical system is increased

Engineering Contradiction:

Improveimaging resolutionVSAvoidoptical system length

Core Design Contradiction:

Measurement precisionVSLength of moving object

Solution Approach 1:

The patent applies parameter changes by carefully controlling the refractive powers, focal lengths, and spacing of each lens element. Specifically, it uses a five-lens configuration where the first lens has negative refractive power, the second has positive refractive power, and the third has negative refractive power, with specific focal length ratios (f1/f=-1.5 to -3.0, f2/f=0.3 to 0.6, f3/f=-0.1 to -0.3) to achieve high resolution while minimizing overall length

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite lens design by combining multiple lens elements with different refractive properties and materials. The five-lens system integrates elements with varying refractive indices and dispersion characteristics to correct aberrations and achieve high-resolution imaging in a compact form factor

Inventive Principle:

Principle #40Composite materials

2Measurement precision

If the optical system length is increased to achieve high resolution, then imaging quality is improved, but the device becomes difficult to mount in thin mobile terminals

Engineering Contradiction:

Improveimaging qualityVSAvoidmounting ease

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The patent optimizes mounting ease by controlling the overall optical system length through parameter adjustments. It specifies that the distance between the first lens and the image sensor should be 4.0mm or less, and controls the focal length ratios and lens spacing to achieve this compact dimension while maintaining high imaging quality

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent addresses the mounting challenge by transitioning from a length-optimized design to a miniaturized three-dimensional configuration. It achieves high resolution in a compact volume by optimizing the spatial arrangement and spacing of all five lens elements along the optical axis, effectively utilizing the third dimension to pack the optical system into a thin profile suitable for mobile terminals

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 design achieves a wide field of view while minimizing the overall length of the optical system, enabling high-resolution imaging with a compact lens module suitable for thin mobile devices.