Imaging Lens Assembly With Aspheric Inflection Points
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Solution Overview
Problem
The challenge is to design a compact, wide-angle imaging lens assembly for thin electronic devices that enhances resolving power and field of view while maintaining a reduced thickness, as existing imaging lens sets struggle to meet these requirements effectively.
Innovation Solution
The proposed imaging lens assembly consists of a set of optical lens elements with specific refractive powers, surface curvatures, and aspheric surfaces, along with a fixed aperture stop, arranged to satisfy specific optical conditions, including refractive power ratios, Abbe numbers, and clear aperture dimensions, which allows for a wider viewing angle and increased resolving power while minimizing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the imaging lens assembly is made smaller to fit thin electronic devices, then the device thickness is reduced, but the resolving power and field of view deteriorate
Solution Approach 1:
The imaging lens assembly is divided into multiple lens elements (first lens element with positive refractive power, second lens element with negative refractive power, third lens element with positive refractive power) arranged sequentially along the optical axis. Each lens element is designed with specific curvature characteristics and refractive powers to collectively achieve wide-angle coverage and high resolving power within a compact thickness constraint.
Solution Approach 2:
The patent applies specific optical parameters and conditions to design the lens system: OL/EPD ratio between 2.0-2.5, Abbe number differences (Vd2-Vd3>20), and specific curvature relationships (R1-R5) to control refractive powers and surface shapes. These parameter optimizations enable the lens assembly to achieve both compact size and high imaging performance.
2Length of moving object
If the imaging lens assembly is made smaller to fit thin electronic devices, then the device thickness is reduced, but the field of view deteriorates
Solution Approach 1:
The lens system is segmented into multiple elements with different refractive powers arranged along the optical axis. This segmentation allows each lens element to contribute to specific aspects of light manipulation, collectively achieving a wide field of view (80 degrees or more) while maintaining compact overall dimensions.
Solution Approach 2:
The patent utilizes aspheric surfaces with inflection points on the lens elements to control light paths in multiple dimensions. The aspheric curvature characteristics (with inflection points) enable the lens system to achieve wide-angle coverage by manipulating light rays in both radial and tangential directions simultaneously.
3Measurement precision
If aspheric surfaces with inflection points are used on lens elements, then the resolving power and field of view are improved, but the manufacturing complexity increases
Solution Approach 1:
The patent specifies precise mathematical parameters for the aspheric surfaces, including the inflection point conditions and curvature relationships (R1-R5). By defining the aspheric surfaces with specific mathematical equations and constraints, the design transforms the complex manufacturing challenge into a controlled parameter optimization problem that can be addressed through precision molding techniques.
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
This configuration achieves improved resolving power, enlarges the maximum viewing angle, and reduces the overall thickness of the imaging lens assembly, effectively addressing the need for compact, high-performance lens systems in thin electronic devices.
Implementation Method 1
The first optical lens element has a positive refractive power near the optical axis... The second optical lens element has a negative refractive power near the optical axis... The third optical lens element has a refractive power near the optical axis
Data Source
AI summary
An imaging lens assembly includes an optical lens set including first, second and third optical lens elements that are arranged sequentially from an object side to an image side along an optical axis of the imaging lens assembly and that respectively have positive, negative and positive refractive powers, and a fixed aperture stop that is disposed between the object side and the first optical lens element. At least one of the object-side surface and the image-side surface of the second optical lens element is aspheric, and at least one of the object-side surface and the image-side surface of the second and third optical lens element has an inflection point.