Three-Element Camera Lens Design for Compact Length
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Solution Overview
Problem
Traditional camera lenses are large and long, hindering the miniaturization of imaging equipment, and existing three-element lens designs do not adequately address the need for compactness while maintaining imaging quality.
Innovation Solution
A camera lens design comprising a first lens with positive power, a second lens with negative power, and a third lens with positive power, made from plastic or PMMA materials, with specific surface shapes and refractive indices to balance optical power distribution, correct aberrations, and reduce overall length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a traditional camera lens design is used, then imaging quality can be maintained, but the lens length becomes too long and hinders miniaturization
Solution Approach 1:
The lens is divided into three distinct elements with specific optical powers (positive, negative, positive) arranged in sequence. Each element contributes differently to the overall optical function, allowing the system to achieve compact length while maintaining imaging quality through distributed optical power management rather than a single long optical path
Solution Approach 2:
The patent specifies precise parameter ranges for each lens element including focal lengths (f1, f2, f3), refractive indices (n2, n3), and curvature radii (r1-r6) that satisfy particular mathematical relationships. By optimizing these parameters within defined ranges, the lens achieves shortened length without compromising imaging performance
2Length of moving object
If a three-element lens design is used to save space, then lens length is reduced, but aberration correction becomes insufficient
Solution Approach 1:
Each lens element is assigned specific local optical properties: the first element has positive power for convergence, the second has negative power for divergence and aberration compensation, and the third has positive power for final focusing. This localized functional differentiation allows effective aberration correction within a compact three-element structure
Solution Approach 2:
The patent employs composite optical design by combining three different lens elements with varying refractive indices and optical powers. The specific combination of positive-negative-positive power distribution creates a composite optical system that corrects multiple types of aberrations simultaneously while maintaining short length
3Ease of manufacture
If lens elements are made from plastic or PMMA materials, then manufacturing cost is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies that certain lens surfaces (object side of first lens, imaging side of third lens) should be aspherical rather than purely spherical. This curvature design allows plastic and PMMA materials to achieve the required optical performance through molded manufacturing, balancing ease of production with necessary precision by leveraging the molding process's capability to create complex curved surfaces
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 shorter lens length, improved high-frequency resolution, and effective aberration correction, balancing size and imaging quality, while maintaining a low cost and wide applicability.
Implementation Method 1
a first lens with positive power, a second lens with negative power, and a third lens with positive power
Implementation Method 2
a first lens with positive power, a second lens with negative power, and a third lens with positive power
Implementation Method 3
a first lens with positive power, a second lens with negative power, and a third lens with positive power
Data Source
AI summary
A camera lens or lens group of reduced overall length includes a first lens with positive power, a second lens with negative power, a third lens with positive power, and an imaging element. The first, object side, lens includes a first surface and a second surface, the second lens includes a third surface and a fourth surface, and the third lens includes a fifth surface and a sixth surface. The camera lens satisfies conditions of 1.00<D/TTL<1.25; 0.85<|F1|/|F|<0.95; 3.85<|F2|/|F|<4.15; and 21.50<|F3|/|F|<27.50. D is the maximum imaging circle diameter on the imaging surface, TTL is the distance from the center point to the imaging side of the object-side surface of the first lens, F is the total focal length of the camera lens, F1 is the focal length of the first lens, F2 is the focal length of the second lens, and F3 is the focal length of the third lens.