Five-Element Aspheric Lens for Compact Image Quality
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Solution Overview
Problem
Conventional compact optical lens systems, particularly those with four-element and five-element lens structures, fail to meet the increasing demands for high resolution and image quality in portable electronic devices, as they cannot effectively enhance photosensitivity and maintain image quality due to limitations in light projection angles and aberration correction.
Innovation Solution
A monofocal optical lens system comprising five lens elements with specific refractive powers and surface shapes, including aspheric surfaces, is designed to optimize image quality by adjusting the axial distances and curvature radii of lens elements, incorporating a stop to enhance telecentricity and reduce the total track length, thereby improving photosensitivity and manufacturability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional four-element lens structure is used, then the device complexity is low, but the image quality and resolving power cannot satisfy high-end requirements
Solution Approach 1:
The lens system is divided into five distinct lens elements with different refractive powers and surface shapes. Each element is optimized for specific functions: the first element (positive refractive power) for light gathering, the second element (negative refractive power) for aberration correction, the third element (aspheric surface) for resolving power enhancement, the fourth element (aspheric surfaces) for telecentricity improvement, and the fifth element (aspheric surfaces) for photosensitivity enhancement. This segmentation allows each element to address specific performance requirements while maintaining overall system balance.
Solution Approach 2:
Multiple lens elements incorporate aspheric surfaces instead of traditional spherical surfaces. Specifically, the third lens element has at least one aspheric surface, the fourth lens element has both surfaces aspheric, and the fifth lens element has both surfaces aspheric. The aspheric curvature is designed to reduce optical aberrations and improve the projection angle of light onto the image sensor, thereby enhancing image quality and photosensitivity while maintaining a compact structure.
2Manufacturing precision
If a conventional five-element lens structure is used, then the image quality is enhanced, but the angle of incident light onto the image sensor cannot be reduced, limiting photosensitivity
Solution Approach 1:
The fourth and fifth lens elements are designed with aspheric surfaces that specifically control the light projection angle. The aspheric curvature of the fourth lens element (with both surfaces aspheric) and the fifth lens element (with both surfaces aspheric) is optimized to reduce the angle at which light projects onto the image sensor. This angular control enhances the photosensitivity of the image sensor while maintaining the enhanced image quality provided by the five-element structure.
Solution Approach 2:
The patent specifies precise parameter relationships for the lens system, including the axial distances between lens elements and the stop (Dr1s and Dr1r4), and the curvature radii of the lens surfaces (R5, R6, R9, R10). These parameters are optimized to achieve the desired balance between image quality and photosensitivity. The specific parameter constraints ensure that the light projection angle is reduced while maintaining proper focus and image quality.
3Object-affected harmful factors
If the total track length is increased, then the photosensitivity can be improved, but the compact size suitable for portable devices is lost
Solution Approach 1:
The five lens elements are arranged in a compact nested configuration within a short total track length. The lens elements are positioned close to each other with optimized spacing, and the stop is strategically located to enhance telecentricity. This nested arrangement allows the system to achieve enhanced photosensitivity through proper light angle control while maintaining a compact size suitable for portable electronic devices.
Solution Approach 2:
The patent establishes specific parameter relationships that optimize the total track length while maintaining photosensitivity. The axial distances Dr1s and Dr1r4, along with the curvature radii R5, R6, R9, and R10, are precisely controlled to achieve the desired optical performance. These parameter optimizations enable the system to achieve enhanced photosensitivity without requiring a longer total track length, thus maintaining compactness for portable applications.
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 proposed optical lens system achieves enhanced image quality and photosensitivity by effectively correcting aberrations and reducing the total track length, maintaining a compact size suitable for portable electronic devices while improving image resolution and field of view.
Implementation Method 1
a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with refractive power, a fourth lens element with negative refractive power, and a fifth lens element with refractive power
Data Source
AI summary
A monofocal optical lens system 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 and a fifth lens element. The first lens element with positive refractive power has a convex object-side surface. The second lens element has negative refractive power. The third lens element has refractive power, wherein at least one of the surfaces thereof is aspheric. The fourth lens element with negative refractive power is made of plastic material, and has a concave object-side surface and a convex image-side surface. The fifth lens element with refractive power is made of plastic material, and has a concave object-side surface, wherein the image-side surface thereof is convex or planar at the paraxial region and is convex at the peripheral region, and the surfaces of the fourth through fifth lens elements are aspheric.