Five-Lens Camera System Narrow Angle of View Design

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Solution Overview

Problem

Existing camera lenses with five lenses fail to achieve a narrow angle of view while maintaining good optical properties, as they often have angles greater than 37°, which is not sufficient for modern portable and web camera applications.

Innovation Solution

A camera lens system comprising five lenses with specific refractive powers and aspheric surfaces, where the first lens has positive refractive power, the second and fourth lenses have negative refractive power, and the third and fifth lenses have positive refractive power, with glass plates between the fifth lens and the imaging plane to correct aberrations, adhering to specific relational expressions for optimal performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Shape

If a five-lens camera lens system is designed with conventional configurations, then the lens can achieve a certain angle of view, but the angle of view is too wide (greater than 37°) and does not meet the narrow angle requirement of less than 20°

Engineering Contradiction:

Improveangle of viewVSAvoidoptical performance

Core Design Contradiction:

ShapeVSReliability

Solution Approach 1:

The patent applies parameter changes by precisely controlling the refractive powers, curvatures, and axial distances of all five lenses. Specific parameters such as the focal lengths (f1, f2, f3, f4, f5), curvature radii (R1-R10), and axial distances (d1-d10) are optimized to achieve the narrow angle of view less than 20° while maintaining good optical performance. The conditional expressions (1)-(10) define the parameter ranges that enable this transformation.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent utilizes aspheric surfaces on multiple lens elements to control light rays and achieve the desired narrow angle of view. The aspheric coefficients (A4, A6, A8, A10, A12, A14) are specifically designed to correct aberrations and enable the narrow angle configuration. This curvature modification allows the lens system to achieve 2ω < 20° while maintaining image quality.

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Shape

If the angle of view is reduced to less than 20°, then the narrow angle requirement is met, but optical aberrations such as spherical aberration, chromatic aberration, field curvature, and distortion increase

Engineering Contradiction:

Improveangle of viewVSAvoidoptical aberration control

Core Design Contradiction:

ShapeVSManufacturing precision

Solution Approach 1:

The patent divides the optical correction function across five separate lens elements, each with specific positive or negative refractive powers. The first lens (L1) has positive power, the second (L2) has negative power, the third (L3) has positive power, the fourth (L4) has negative power, and the fifth (L5) has positive power. This segmentation allows each element to contribute to correcting specific types of aberrations while collectively achieving the narrow angle of view.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces glass plates (GF1 and GF2) with specific curvature radii as intermediary elements between the fifth lens and the imaging plane. These glass plates act as mediators to correct residual aberrations, particularly field curvature and distortion, enabling the system to achieve both the narrow angle of view and acceptable optical performance.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 3:

The patent employs multiple glass materials with different refractive indices (nd1, nd2, nd3, nd4, nd5) and Abbe numbers (νd1, νd2, νd3, νd4, νd5) for the five lens elements. This composite material approach allows for chromatic aberration correction by using materials with complementary dispersion properties, enabling the narrow angle design to maintain color accuracy and reduce chromatic effects.

Inventive Principle:

Principle #40Composite materials

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 achieves a narrow angle of view of less than 20° with improved optical characteristics, including reduced spherical aberration, chromatic aberration, field curvature, and distortion, making it suitable for high-pixel CCD or CMOS camera elements.