Five-Lens Camera Module Resolving Size and Aberration Trade-Off

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Solution Overview

Problem

Existing camera lenses for mobile devices and webcams with high-pixel camera elements, such as CCD and CMOS, face challenges in achieving narrow angle and small-sized designs with excellent optical properties due to insufficient refractive power distribution and improper lens shapes, as seen in prior patents like Japanese Patent Publications 2015-121601 and 2015-165338.

Innovation Solution

A camera lens composed of five sequentially arranged 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 negative refractive power, and a fifth lens with negative refractive power, along with a glass plate or optical filter, meeting specific conditions to optimize focal distances and curvature radii for improved optical performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the camera lens is designed with five piece lenses to achieve narrow angle and small size, then the angle of view is reduced and size is minimized, but the optical properties deteriorate due to insufficient refractive power distribution and improper lens shapes

Engineering Contradiction:

Improvecamera lens sizeVSAvoidoptical properties

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The patent applies parameter changes by optimizing the refractive power distribution across the five lenses and adjusting specific shape parameters (curvature radii R1-R10, thicknesses d1-d9, and spacing d0-d8) to achieve narrow angle (47.3°) and small size while maintaining excellent optical properties. The conditional expressions (1)-(7) define the precise parameter ranges needed to resolve the contradiction between miniaturization and optical performance.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies local quality by assigning different refractive powers and aspheric shapes to specific lens positions. The first lens has positive refractive power with specific curvature characteristics, while the second, fourth, and fifth lenses have negative refractive powers with different shape parameters. This localized optimization of each lens's properties enables the overall system to achieve both small size and excellent optical correction.

Inventive Principle:

Principle #3Local quality

2Reliability

If the refractive power distribution is increased to improve optical properties, then aberration correction is enhanced, but the lens size and complexity increase

Engineering Contradiction:

Improveaberration correctionVSAvoidcamera lens size

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The patent applies segmentation by dividing the optical system into five distinct lenses with specific refractive power assignments. The first lens (positive power) and third lens (positive power) work together with the second, fourth, and fifth lenses (negative power) to distribute the aberration correction function across multiple segments. This segmentation allows effective aberration control without requiring excessive refractive power in any single element, thus avoiding size increase.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies spheroidality by using aspheric surfaces on all five lenses. The aspheric shapes (defined by curvature radii and conical coefficients) enable more efficient aberration correction compared to spherical surfaces, allowing the system to achieve excellent optical properties with reduced refractive power requirements and compact size.

Inventive Principle:

Principle #14Spheroidality (Curvature)

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 enables the production of small-sized and narrow-angle camera lenses with excellent optical properties, effectively correcting spherical and chromatic aberrations, as demonstrated by the embodiments meeting the specified conditions and achieving a total angle of view of approximately 47.3°, thus enhancing image quality.