Seven-Element Optical Lens Assembly for Large Aperture Imaging
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Solution Overview
Problem
Conventional optical systems for electronic devices face challenges in achieving a large aperture and short total track length, leading to issues such as curved images, severe distortion, and insufficient relative illumination, especially in compact optical systems with six-element lens structures.
Innovation Solution
A seven-element optical lens assembly with specific surface shapes and refractive powers, including aspheric surfaces, and air gaps between lens elements, optimized by conditions like R11/f < 0 and other parameters, to achieve a large aperture and compact size with improved image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional four-element or five-element lens structure is used, then the device complexity is reduced, but the aperture cannot be made large and the total track length cannot be shortened
Solution Approach 1:
The optical lens assembly is divided into seven separate lens elements with air gaps between them, allowing each element to be optimized independently for specific functions (positive or negative refractive power) while collectively achieving large aperture and short total track length
Solution Approach 2:
The patent introduces aspheric surfaces on multiple lens elements (first, fifth, sixth, and seventh lens elements) to add dimensional complexity to the surface geometry, enabling better control of light paths and aberrations without increasing the axial length
2Length of stationary object
If a compact optical system with six-element lens structure is used, then the total track length is shortened, but the surface shape becomes poor causing curved image, severe distortion and insufficient relative illumination
Solution Approach 1:
The seven lens elements are strategically positioned with air gaps between them, allowing each element to contribute specifically to correcting different types of aberrations (spherical, coma, astigmatism, field curvature, distortion) while maintaining compact overall length
Solution Approach 2:
Aspheric surfaces are implemented on the first, fifth, sixth, and seventh lens elements to replace traditional spherical surfaces, enabling precise control of light ray paths to correct curved image, distortion, and illumination uniformity issues
3Manufacturing precision
If the number of lens elements is increased to seven, then image quality is improved and aberrations are corrected, but the device complexity increases
Solution Approach 1:
The seven lens elements are designed with alternating positive and negative refractive powers in a systematic arrangement, where each element serves a specific optical function, allowing complex image quality correction to be achieved through modular design
Solution Approach 2:
By implementing aspheric surfaces on key lens elements rather than all elements, the patent achieves superior aberration correction and image quality while limiting the complexity increase to only the necessary components
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 reduces curved images, enhances relative illumination, and maintains a compact size while correcting aberrations, providing high image quality and a wide field of view.
Implementation Method 1
The first lens element with positive refractive power, the second lens element with refractive power, the third lens element with refractive power, the fourth lens element with refractive power, the fifth lens element with refractive power, the sixth lens element with refractive power, and the seventh lens element with refractive power
Data Source
AI summary
An optical lens assembly 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, a sixth lens element and a seventh lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The second lens element has refractive power. The third lens element has refractive power. The fourth lens element has refractive power. The fifth lens element with refractive power has an image-side surface being concave in a paraxial region thereof. The sixth lens element with refractive power has an object-side surface being concave in a paraxial region thereof. The seventh lens element with refractive power has an image-side surface being concave in a paraxial region thereof.