Five-Lens Optical Imaging System for Narrow Field of View
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Solution Overview
Problem
There is a need for an optical imaging system suitable for camera modules with a narrow field of view, as existing developments have focused more on wide-field-of-view camera modules.
Innovation Solution
The optical imaging system comprises five sequentially disposed lenses with specific refractive powers and surface curvatures, including a first lens with positive refractive power and convex object-side surface, a second lens with negative refractive power and concave image-side surface, and a fifth lens with negative refractive power and concave surfaces, optimized to achieve a narrow field of view and compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If five or more lenses are used to achieve high resolution, then image resolution is improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by carefully selecting and optimizing the refractive indices, curvatures, and thicknesses of each lens element. The specific conditional expressions (1) through (5) define precise parameter ranges that enable high-resolution imaging with exactly five lenses, avoiding the need for more complex multi-element systems while maintaining superior image quality.
Solution Approach 2:
Each lens element is designed with specific local optical properties - the first lens has positive refractive power with specific curvature relationships, the second and fifth lenses have negative refractive power, and intermediate lenses have positive power. This localized optimization of optical characteristics across different elements achieves high overall system performance with a manageable number of components.
2Measurement precision
If a narrow field of view is designed, then image resolution is improved, but device adaptability decreases
Solution Approach 1:
The patent optimizes specific optical parameters including the focal length ratio (0.5 < |f2/f1| < 1.5), curvature relationships (0.05 < |R2/R1| < 0.3), and position ratios (0.3 < |v2/v1| < 0.7) to achieve a narrow field of view while maintaining high resolution. These parameter adjustments create an optical system specialized for detailed imaging of smaller angular regions.
3Adaptability or versatility
If lens curvatures are optimized for narrow field of view, then field of view is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent defines specific parameter ranges that balance optical performance with manufacturability. The curvature ratios are constrained within moderate ranges (0.05 < |R2/R1| < 0.3) rather than extreme values, and the refractive power distribution is optimized to avoid excessive curvature requirements. This enables narrow field of view achievement while keeping manufacturing precision requirements at practical levels.
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 system effectively captures high-resolution images with a narrow field of view while being compact enough for integration into small terminals, satisfying specific conditional expressions for TTL, focal length, and field of view.
Implementation Method 1
an optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, wherein the first to fifth lenses are sequentially disposed from an object side toward an imaging plane
Data Source
AI summary
An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The first lens includes a convex object-side surface and a concave image-side surface. The second lens includes a concave object-side surface and a concave image-side surface. The third lens includes a concave object-side surface. The fourth lens includes a concave object-side surface. The fifth lens includes a concave object-side surface and a concave image-side surface. The first to fifth lenses are sequentially disposed from an object side toward an imaging plane.