Five-Lens Imaging Optical System Aberration Correction
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Solution Overview
Problem
Existing imaging optical systems with five lens elements fail to achieve sufficient miniaturization and optimal aberration correction, as they do not adequately optimize the refractive powers of all lens elements, leading to suboptimal performance in terms of size and image quality.
Innovation Solution
An imaging optical system with five lens elements, specifically configured with positive, negative, positive, positive, and negative refractive powers, or positive, negative, negative, positive, and negative refractive powers, adhering to conditional expressions that optimize the combined focal lengths and distances between lens elements to achieve ultra-miniaturization and effective aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional five-lens-element imaging optical systems are used, then high performance is achieved, but sufficient miniaturization cannot be achieved
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive powers of individual lens elements through specific conditional expressions. The first lens element has refractive power satisfying 0.15 < f1/f < 0.30, the second satisfies -0.45 < f2/f < -0.15, the third satisfies 0.30 < f3/f < 0.72, and the fourth satisfies 0.20 < f4/f < 0.50. These optimized parameter ranges enable both miniaturization and effective aberration correction by balancing the optical parameters of each element.
2Ease of manufacture
If the refractive powers of lens elements are not optimized, then manufacturing is simpler, but aberration correction and miniaturization are insufficient
Solution Approach 1:
The patent defines specific parameter ranges for refractive powers that balance manufacturing feasibility with optical performance. By specifying that f1/f should be between 0.15 and 0.30, f2/f between -0.45 and -0.15, f3/f between 0.30 and 0.72, and f4/f between 0.20 and 0.50, the patent provides manufacturable guidelines that achieve both ease of production and high precision aberration correction.
3Volume of moving object
If lens elements are configured for miniaturization, then compactness is achieved, but aberration correction becomes insufficient
Solution Approach 1:
The patent achieves both miniaturization and high image quality by optimizing the refractive power parameters of each lens element. The conditional expressions ensure that even in a compact configuration, the optical system maintains proper aberration correction capabilities through balanced parameter distribution across all five lens elements.
Solution Approach 2:
The patent combines multiple functions into the five-lens-element configuration, where each lens element contributes to both the overall compactness and the aberration correction. The integrated design allows the system to achieve miniaturization while maintaining image quality through the synergistic arrangement of all elements.
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 corrects various aberrations while achieving ultra-miniaturization, ensuring high image quality and compactness, suitable for high-pixel imaging elements in mobile devices.
Implementation Method 1
an imaging optical system provided with five lens elements having positive, negative, positive, positive, and negative refractive powers, or positive, negative, negative, positive, and negative refractive powers
Data Source
AI summary
An imaging optical system, an imaging device, and a digital apparatus of the invention are provided with an optical system constituted of five lens elements having positive, negative, positive, positive, and negative refractive powers, or positive, negative, negative, positive, and negative refractive powers; and satisfy the conditional expressions:1<f123/f<1.250.1<d6/f<0.150.30<f4/f<0.72wheref: a focal length of the entirety of the imaging optical system,f123: a combined focal length of the first lens element 11, the second lens element 12, and the third lens element 13, d6: a distance on the optical axis between the third lens element 13 and the fourth lens element 14, andf4: a focal length of the fourth lens element 14.