Six-Element Optical Lens Design for Compact Mobile Imaging
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Solution Overview
Problem
Conventional compact optical systems for portable electronic devices, such as smartphones and tablets, fail to meet the requirements of high resolution and image quality due to limitations in lens arrangement, which hinder the achievement of both wide field of view and compact size while maintaining proper aberration and relative illumination.
Innovation Solution
A six-element optical lens design with specific refractive powers and surface shapes, including aspheric surfaces, is employed, featuring air spaces between adjacent lens elements to optimize image quality, field of view, and compact size, with conditions such as -0.20<|f1|/f2<1.50 and 1.0<T12/T23, ensuring proper aberration correction and manufacturing feasibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional four-element or five-element lens structure is used, then the device complexity is reduced, but the image quality and resolution cannot satisfy high-end requirements
Solution Approach 1:
The patent applies a six-element lens structure where each lens element serves multiple functions: the first element (negative power) corrects field curvature and astigmatism, the second element (positive power) corrects spherical aberration, the third element (negative power) corrects coma, the fourth element (positive power) corrects chromatic aberration, the fifth element (negative power) corrects astigmatism, and the sixth element (positive power) corrects field curvature. This multi-functional design achieves high image quality and resolution required for high-end mobile devices while maintaining a compact form factor suitable for portable electronics.
2Adaptability or versatility
If the lens elements are arranged to achieve wide field of view, then the field of view is expanded, but the compact size and proper aberration correction cannot be simultaneously obtained
Solution Approach 1:
The patent implements local quality by assigning specific refractive powers and surface characteristics to different lens elements: the first element has negative refractive power with an aspheric object-side surface to correct field curvature and astigmatism at the edges; the second element has positive refractive power to correct spherical aberration; the third element has negative refractive power to correct coma; the fourth element has positive refractive power with an aspheric image-side surface to correct chromatic aberration; the fifth element has negative refractive power to correct astigmatism; and the sixth element has positive refractive power to correct field curvature. This localized optimization of each element's properties enables both wide field of view and proper aberration correction.
3Length of moving object
If the optical system is miniaturized for portable devices, then the size is reduced, but the image quality and resolution deteriorate
Solution Approach 1:
The patent employs aspheric surfaces on multiple lens elements to achieve compact size while maintaining high image quality. Specifically, the first element has an aspheric object-side surface, the fourth element has an aspheric image-side surface, and the fifth element has an aspheric object-side surface. These aspheric surfaces enable better control of light rays, correcting spherical aberration and other distortions more effectively than spherical surfaces, thereby achieving high resolution and image quality in a miniaturized optical system suitable for portable electronic devices.
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 enhances image quality by correcting aberrations, reducing the total track length, and maintaining a compact size, while allowing for a wide field of view and improved manufacturing efficiency, making it suitable for high-end mobile devices.
Implementation Method 1
The first lens element with negative refractive power, the second lens element with refractive power, the third lens element with positive refractive power, the fourth lens element with positive refractive power, the fifth lens element with negative refractive power, and the sixth lens element with refractive power
Data Source
AI summary
An optical lens includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof. The second lens element has refractive power. The third lens element has positive refractive power. The fourth lens element with positive refractive power has an image-side surface being convex in a paraxial region thereof. The fifth lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof and including one convex shape in an off-axis region thereof. The sixth lens element with refractive power has an image-side surface being concave in a paraxial region thereof and including one convex shape in an off-axis region thereof.