Six-piece lens assembly for compact imaging
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Solution Overview
Problem
Conventional optical lenses for image capture in digital devices face challenges in miniaturization and cost reduction while maintaining high image quality, particularly in correcting optical aberrations at smaller F-numbers and larger wide-angle applications.
Innovation Solution
A six-piece optical lens assembly is designed with specific refractive powers, surface shapes, and aspheric surfaces to reduce the total length of the lens while enhancing imaging quality, comprising a combination of lens elements with positive and negative refractive powers, convex and concave surfaces, and inflection points, along with an aperture stop and image-plane configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional spherical polishing glass lenses are used, then chromatic aberration correction is improved, but optical aberration correction becomes harder when smaller F Number and larger Wide-angle are applied
Solution Approach 1:
The patent combines glass lens elements with plastic lens elements to create a composite optical system. Specifically, it uses a six-piece lens assembly comprising multiple glass and plastic elements with different refractive indices and dispersion properties, enabling simultaneous correction of chromatic and spherical aberrations that cannot be achieved with single-material lenses
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements to correct spherical aberration and other optical imperfections. The aspheric profiles allow for better control of light rays across the entire aperture, improving image quality while enabling smaller F-numbers and wider angles without sacrificing aberration correction
2Measurement precision
If aspheric plastic lens or aspheric molding glass lens is used to acquire better imaging quality, then imaging quality is improved, but the optical module needs combination of more lenses resulting in oversized assembly
Solution Approach 1:
The patent merges multiple optical functions into a compact six-piece lens assembly where glass and plastic elements work together synergistically. The design integrates chromatic correction, spherical aberration correction, and focus control within a unified compact structure, eliminating the need for separate correction lenses and reducing overall module size
Solution Approach 2:
The patent optimizes multiple parameters simultaneously including refractive indices, Abbe numbers, curvature radii, and thicknesses of individual lens elements. By carefully selecting and adjusting these parameters, the design achieves high imaging quality with a compact form factor, balancing optical performance with miniaturization requirements
3Reliability
If combination of more lenses is used to have better optical performance, then optical performance is improved, but the whole optical module becomes oversized and incapable of downsizing
Solution Approach 1:
The patent segments the optical system into six distinct lens elements with specific functions, where each element contributes to overall performance. This segmentation allows for optimized placement and function assignment, achieving high optical performance with minimal total length by eliminating redundant elements and optimizing the contribution of each segment
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 solution effectively compensates for astigmatic, distortion, and longitudinal spherical aberrations, achieving better optical performance and compactness, thus addressing the need for miniaturization and cost-effectiveness in electronic devices.
Implementation Method 1
a first lens element (10) with positive refractive power; a second lens element (20) with negative refractive power; a third lens element (30) with refractive power; a fourth lens element (40) with refractive power
Data Source
AI summary
A six-piece lens assembly for capturing images is provided, which comprises an optical lens, an aperture stop, and an image-plane. The optical lens comprises six lenses as below. A first lens with positive refractive power has a convex image-side surface. A second lens with negative refractive power has a convex object-side surface. A third lens with refractive power has a concave image-side surface. A fourth lens has the refractive power. A fifth lens has a convex image-side surface and a convex object-side surface and a sixth lens has a concave image-side and a concave object-side surface. At least one of the object-side surface and the image-side surface of the second lens and the fourth lens are aspheric. At least one of the object-side surface and the image-side surface of the third lens, the fifth lens, and the sixth lens have at least one an inflection points.