Five-Piece Lens Set Aberration Control Compact Optical Design
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Solution Overview
Problem
Conventional five-piece optical lens sets with fixed focal lengths face challenges in minimizing total length while maintaining high image quality, particularly in miniaturized designs for electronic products with high pixel resolution, as they tend to increase the back focal length and full length, making it difficult to shorten the optical system effectively.
Innovation Solution
A five-piece lens set is designed with specific refractive powers, surface types, and aspherical surfaces for the lens elements, including a fixed aperture stop and an infrared filter, to optimize the combination of lens elements, reducing the total length and enhancing image capturing quality by controlling aberrations and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional lens elements with positive or negative refractive power are combined to increase back focal length, then image capturing quality is improved, but total length of the optical system increases
Solution Approach 1:
The patent changes the refractive power parameters of the lens elements by introducing a fourth lens element with positive refractive power and a fifth lens element with negative refractive power, creating a specific refractive power distribution pattern that optimizes both image quality and compactness
Solution Approach 2:
The patent employs curved surfaces with specific radii of curvature for each lens element, including the first lens element with radius R1, second lens element with radius R2, third lens element with radius R3, fourth lens element with radius R4, and fifth lens element with radius R5, where the curvature parameters are optimized to achieve compact total length while maintaining high image quality
2Manufacturing precision
If more lens elements are added to enhance image quality, then aberration compensation is improved, but device complexity increases
Solution Approach 1:
The patent merges the functions of multiple lens elements into a coordinated five-element system where each element contributes specific aberration correction capabilities, achieving superior aberration compensation without excessive complexity
Solution Approach 2:
The patent assigns different local qualities to each lens element, with the first lens element having refractive power P1, second lens element having refractive power P2, third lens element having refractive power P3, fourth lens element having refractive power P4, and fifth lens element having refractive power P5, where each element is optimized for specific aberration correction
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 effectively shortens the total length of the lens set while improving image capturing quality by compensating for astigmatism, distortion, and spherical aberrations, achieving a compact and high-resolution optical system with a wide field of view.
Implementation Method 1
The first lens element has negative refractive power adjacent to the optical axis. The second lens element has negative refractive power adjacent to the optical axis. The third lens element has positive refractive power adjacent to the optical axis. The fourth lens element has positive refractive power adjacent to the optical axis. The fifth lens element has negative refractive power adjacent to the optical axis.
Data Source
AI summary
A five-piece lens set for capturing images, which includes a fixed aperture stop and an optical lens set, is disclosed. The optical lens set includes a first, a second, a third, a fourth and a fifth lens elements. The first lens element has negative refractive power adjacent to optical axis and a concave image side surface. The second lens element has negative refractive power adjacent to optical axis. The third lens element has positive refractive power adjacent to optical axis, both convex image side and object side surface. The fourth lens element has positive refractive power adjacent to optical axis and a convex object side surface. The fifth lens element has negative refractive power adjacent to optical axis and a convex image side surface. There is an interval between the image side surface of the fourth lens element and the object side surface of the fifth lens element.