Five-Element Aspheric Optical Imaging Lens System for Compact High-Quality Design
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Solution Overview
Problem
Conventional compact optical imaging lens systems with four lens elements fail to meet the demands for high image quality and compact design in portable electronic devices due to insufficient aberration correction and chromatic aberration, especially with the rise of high-resolution imaging in smartphones and PDAs.
Innovation Solution
An optical imaging lens system comprising five non-cemented lens elements with specific refractive powers and aspheric surfaces, including a first lens with positive refractive power, a second lens with positive refractive power, a third lens with negative refractive power and aspheric surfaces, a fourth lens with aspheric surfaces, and a plastic fifth lens with a concave image-side surface and inflection points, optimizing the distribution of refractive power to improve light gathering and correct aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional four lens element system is used, then the device complexity is reduced, but the aberration correction and chromatic aberration capability are insufficient
Solution Approach 1:
The lens system is divided into five separate non-cemented lens elements with different refractive powers and surface characteristics. Each lens element is optimized for specific aberration correction functions, allowing independent design and adjustment of each component's properties to achieve overall system optimization.
Solution Approach 2:
Different lens elements are assigned specific local functions: the first lens provides positive refractive power with a convex object-side surface for light gathering, the second lens contributes additional positive refractive power, the third lens with negative refractive power corrects chromatic aberration, the fourth lens with aspheric surfaces corrects spherical aberration, and the fifth plastic lens with inflection points handles peripheral ray correction. Each element's specific surface geometry and material properties are optimized for its designated correction task.
2Length of moving object
If the total track length is reduced for compact design, then the device size is reduced, but the image quality and aberration correction are compromised
Solution Approach 1:
Multiple lens elements incorporate aspheric surfaces with specific curvature coefficients to correct optical aberrations. The aspheric surfaces enable the lens system to achieve high image quality with reduced track length by optimizing the path of light rays through non-spherical geometries that compensate for spherical aberration and other optical defects.
Solution Approach 2:
The lens system optimizes multiple parameters including the refractive indices of different lens materials, the curvatures of lens surfaces, the thicknesses of individual elements, and the spacing between lens elements. By carefully adjusting these parameters, the system achieves effective aberration correction within a compact total track length configuration.
3Reliability
If more lens elements are added to improve aberration correction, then the image quality is improved, but the device complexity increases
Solution Approach 1:
The lens system employs different materials with distinct refractive indices and dispersion characteristics for each lens element. This allows optimization of chromatic aberration correction by selecting materials with complementary optical properties, enabling effective correction with only five elements rather than requiring more simple elements.
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 disperses refractive power, reduces the total track length of the lens system, and corrects aberrations, enabling high image quality and compactness suitable for portable electronic devices.
Implementation Method 1
five non-cemented lens elements with refractive power... distribution of refractive power of the optical imaging lens system can be effectively dispersed
Data Source
AI summary
This invention provides an optical imaging lens system in order from an object side to an image side comprising five non-cemented lens elements with refractive power: a first lens element with positive refractive power having a convex object-side surface; a second lens element with positive refractive power; a third lens element with negative refractive power, and both surfaces being aspheric; a fourth lens element having a convex image-side surface, and both surfaces being aspheric; and a plastic fifth lens element having a concave image-side surface, both surfaces being aspheric, and at least one inflection point is formed on at least one of the surfaces thereof. By such arrangement, the refractive power of the optical imaging lens system can be effectively distributed with improved light converging power so that the total track length can be shortened effectively, and the aberration of system can be corrected to facilitate high image quality.