Five-Lens Camera Module with Aspheric Plastic Elements for Compact Imaging
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Solution Overview
Problem
Conventional five-piece camera lenses suffer from inadequate refractive index distribution and shape, leading to suboptimal imaging quality, particularly with long focal lengths, high sensitivity, and difficulty in miniaturization.
Innovation Solution
A five-piece camera lens design comprising specific aspheric plastic lenses with tailored focal lengths, refractive indices, and Abbe numbers, including a positive first lens, negative second and fourth lenses, and a negative fifth lens, optimized to achieve clear imaging with a long focal length while minimizing optical length and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional five-piece camera lens design is used, then manufacturing cost is reduced, but imaging quality and sharpness deteriorate due to insufficient refractive index distribution and non-ideal shape
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive index distribution (n1, n2, n3, n4, n5) and Abbe numbers (v1, v2, v3, v4, v5) of each lens element, along with specific shape parameters (radii of curvature R1-R10, thickness d1-d5, and spacing d6-d10) to achieve optimal imaging quality with long focal length while maintaining manufacturing feasibility through standardized plastic lens fabrication processes
Solution Approach 2:
The patent employs composite material principles by selecting plastic lens materials with specific refractive index ranges (1.50 < n1 < 1.60, 1.60 < n2 < 1.70, 1.55 < n3 < 1.65, 1.50 < n4 < 1.60, 1.65 < n5 < 1.75) and Abbe number ranges (40 < v1 < 50, 20 < v2 < 30, 20 < v3 < 30, 40 < v4 < 50, 20 < v5 < 30) to optimize the overall optical system performance while using cost-effective plastic materials
2Manufacturing precision
If long focal length is achieved, then imaging sharpness is improved, but optical length increases making miniaturization difficult
Solution Approach 1:
The patent achieves high imaging sharpness with compact optical length by optimizing the focal length ratios of individual lenses (0.5 < f1/f < 0.7, -0.7 < f2/f < -0.5, 1.2 < f3/f < 1.5, -1.5 < f4/f < -1.2, -1.2 < f5/f < -1.0) and controlling the distribution of refractive indices and Abbe numbers across the five lens elements, enabling long focal length (f > 5mm) with reduced optical length (TTL < 5.0mm)
Solution Approach 2:
The patent segments the optical system into five distinct plastic lens elements with alternating positive and negative focal powers, where the first lens (L1) has positive focal power (0.3 < f1 < 0.5mm) and lenses L2-L5 have negative focal power, allowing independent optimization of each element's parameters to achieve overall system compactness while maintaining long focal length imaging capability
3Manufacturing precision
If refractive index distribution is optimized, then chromatic aberration is reduced, but design complexity increases
Solution Approach 1:
The patent reduces chromatic aberration by optimizing the refractive index distribution (n1 < n2, n3 > n4) and Abbe number distribution (v1 > v2, v3 > v4, v5 < v1) across the five lens elements, with specific parameter ranges: 1.50 < n1 < 1.60, 1.60 < n2 < 1.70, 1.55 < n3 < 1.65, 1.50 < n4 < 1.60, 1.65 < n5 < 1.75; and 40 < v1 < 50, 20 < v2 < 30, 20 < v3 < 30, 40 < v4 < 50, 20 < v5 < 30, achieving effective chromatic aberration correction through material selection
Solution Approach 2:
The patent applies local quality principles by assigning different refractive index and Abbe number characteristics to specific lens elements based on their position and function in the optical system: the first lens (L1) uses material with lower refractive index and higher Abbe number (40 < v1 < 50) for initial light convergence, while the second lens (L2) uses material with higher refractive index and lower Abbe number (20 < v2 < 30) for chromatic aberration compensation, creating localized material optimization throughout the system
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 high sharpness and low sensitivity with reduced chromatic aberration, enabling miniaturization and cost-effectiveness, with a focal length to optical length ratio less than 1.07 and F-number less than or equal to 2.6, enhancing imaging performance.
Implementation Method 1
the distribution of refractive index of a first lens, a second lens, a third lens, a fourth lens and a fifth lens of the current five-piece camera lens is insufficient
Data Source
AI summary
The present disclosure provides a camera lens, including a first lens (focal length is f1), a second lens (focal length is f2), a third lens (focal length is f3), a fourth lens (focal length is f4) and a fifth lens (focal length is f5) which are successively arranged from an object side to an image side and which satisfy the following conditional expressions, 0.5<f1/f<0.7, −2<f2/f<−0.5, 1.6<f3/f<2.0, −2.1<f4/f<−1.45, −1.5<f5/f<−1.2, in which, f is the focal length of the integral camera lens. Through reasonably optimizing surface type, allocating focal power and selecting optical material, the present disclosure designs a camera lens with a long focal length, which has the advantages of high sensitivity, low sensitivity, the chromatic aberration can be better calibrated, resulting in good optical performance.