Seven-Piece Optical Lens Aberration Correction
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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 when attempting to correct field curvature and longitudinal spherical aberration, especially at smaller F-numbers and larger wide-angle applications.
Innovation Solution
A seven-piece optical lens configuration is introduced, comprising refractive power elements with convex and concave surfaces, including aspheric surfaces, to minimize the total lens length and enhance imaging quality. This configuration includes a specific arrangement of lens elements with refractive powers, aspheric surfaces, and an aperture stop and IR-CUT filter, optimized using an aspherical formula to correct aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional spherical polishing glass lenses are used, then field curvature correction is improved, but longitudinal spherical aberration becomes harder to correct when smaller F Number and larger Wide-angle are applied
Solution Approach 1:
The patent employs aspheric surfaces on multiple lens elements (second, sixth, and seventh lens elements have at least one aspheric surface) to correct both field curvature and longitudinal spherical aberration. The aspheric profiles allow for precise control of light ray paths, enabling correction of spherical aberration while maintaining field curvature correction capabilities that spherical lenses cannot achieve alone.
2Manufacturing 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 becomes oversized requiring combination of more lenses
Solution Approach 1:
The patent combines multiple lens elements with different functions into a compact seven-element configuration. The first, third, fourth, and fifth lens elements work together with the aspheric second, sixth, and seventh elements to achieve comprehensive aberration correction in a single integrated optical module, eliminating the need for separate correction elements and reducing overall size.
Solution Approach 2:
The patent utilizes the seventh lens element with a convex object-side surface positioned close to the image sensor, creating a compact telephoto configuration that folds the optical path and reduces the overall module length while maintaining the required focal length and imaging quality.
3Manufacturing precision
If more lenses are combined to achieve better optical characteristic, then imaging quality is improved, but the total length of optical lens increases
Solution Approach 1:
The patent optimizes the refractive indices and Abbe numbers of the seven lens elements to achieve excellent aberration correction. The specific parameter ranges for curvature radii, thicknesses, and material properties allow the compact seven-element design to match or exceed the performance of larger conventional designs.
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 shortens the optical lens length, improves imaging quality by correcting longitudinal spherical aberration, astigmatic field curvature, and distortion, while maintaining a compact design suitable for miniaturized electronic products.
Implementation Method 1
a first lens element with refractive power near the optical axis; a second lens element with refractive power near the optical axis... a fourth lens element with positive refractive power near the optical axis
Data Source
AI summary
The invention discloses a seven-piece optical lens for capturing image and a seven-piece optical module for capturing image. In order from an object side to an image side, the optical lens along the optical axis comprises a first lens element; a second lens element; a third lens element; a fourth lens element with positive refractive power; a fifth lens element; a sixth lens element with positive refractive power having a convex image-side; and a seventh lens element with positive refractive power having a convex object-side, and the first lens element, the second lens element, the third lens element, and the fifth lens element have refractive power, and at least one of the image-side surface and object-side surface of the second lens element, the sixth lens element, and the seventh lens element are aspheric.