Four-Lens Imaging Assembly with Aspheric Surfaces for Wide Viewing Angle
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Solution Overview
Problem
Conventional imaging lens assemblies for thin electronic devices, such as smartphones and tablets, require miniaturization while maintaining optical performance, particularly in achieving a wider viewing angle and reduced thickness.
Innovation Solution
The proposed imaging lens assembly consists of a four-lens structure with specific refractive powers and aspheric surfaces, including a fixed aperture stop between the first and second lenses, which satisfies optical conditions that allow for a smaller size and wider viewing angle, and corrects aberrations through precise surface design and placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the imaging lens assembly is miniaturized to reduce thickness, then the device thickness is reduced, but the viewing angle and optical performance deteriorate
Solution Approach 1:
The patent employs aspheric surfaces on multiple lens elements (first, second, third, and fourth optical lens elements) to replace traditional spherical surfaces. This curvature optimization enables better light ray control in a compact configuration, achieving a wider viewing angle (120 degrees or more) while maintaining reduced lens assembly thickness, thus resolving the contradiction between miniaturization and viewing angle performance
Solution Approach 2:
The patent optimizes specific optical parameters including the focal length ratio (TL/f between 1.8 and 2.4), refractive powers of individual lens elements, and surface curvatures. By precisely controlling these parameters, the design achieves compact dimensions while maintaining wide viewing angle capability and corrected optical aberrations, effectively balancing thickness reduction with performance preservation
2Volume of moving object
If the imaging lens assembly is miniaturized to reduce size, then the device size is reduced, but the aberration correction capability deteriorates
Solution Approach 1:
The patent divides the optical system into four distinct optical lens elements with specific refractive power assignments (negative, positive, positive, negative). Each element is designed with specific aspheric surface characteristics to address different aberration types. This segmentation allows effective aberration correction in a compact four-element configuration, resolving the contradiction between miniaturization and optical precision
Solution Approach 2:
The patent utilizes aspheric surfaces on all four optical lens elements to correct various optical aberrations including spherical aberration, coma, and astigmatism. The aspheric profiles enable precise control of light ray paths in a compact design, achieving superior aberration correction capability while maintaining reduced lens assembly size
3Reliability
If a four-lens structure is used to maintain optical performance, then the optical quality is preserved, but the device thickness increases
Solution Approach 1:
The patent establishes specific parameter ranges including TL/f between 1.8 and 2.4, and optimizes the refractive powers and surface curvatures of all four lens elements. These parameter optimizations enable the four-lens structure to achieve high optical performance with reduced thickness, resolving the contradiction between maintaining optical quality and reducing device dimensions
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 enables a compact imaging lens assembly with improved optical performance, including reduced aberrations and increased maximum viewing angle, by optimizing the lens arrangement and surface geometry, thereby addressing the need for smaller and more efficient lens systems in modern electronic devices.
Implementation Method 1
The first optical lens element has a negative refractive power near the optical axis. The second optical lens element has a positive refractive power near the optical axis. The third optical lens element has a positive refractive power near the optical axis. The fourth optical lens element has a negative refractive power near the optical axis.
Data Source
AI summary
An imaging lens assembly includes first, second, third and fourth optical lens elements that are arranged sequentially from an object side to an image side along an optical axis and that respectively have negative, positive, positive and negative refractive powers, and a fixed aperture stop that is disposed between the first and second optical lens elements. The fourth optical lens element has object-side surface and an image-side surface that has at least an inflection point. The imaging lens assembly satisfies the optical condition of 1.8<TL/f<2.4, in which, TL represents a distance from an object-side surface of the first optical lens element to an imaging plane, and f represents a focal length of the imaging lens assembly.