Optical Imaging Lens Assembly Compact Design Aberration Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional compact imaging lens assemblies face challenges in reducing total track length, maintaining image quality, and minimizing light sensitivity due to the complexity of spherical glass lens arrangements and increased reflections within a limited space.
Innovation Solution
The optical imaging lens assembly is designed with specific configurations of lens elements, including a first lens with positive refractive power, a second lens with negative refractive power, and a fourth lens with a convex and concave surface, along with strategically placed stops to control light and reduce aberrations, while maintaining a compact form factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If spherical glass lenses are adhered together to form a doublet for correcting chromatic aberrations, then chromatic aberration correction is improved, but the total track length cannot be reduced easily and manufacturing complexity increases
Solution Approach 1:
The patent divides the optical system into four separate lens elements with specific refractive powers and surface curvatures, replacing the conventional spherical glass doublet structure. Each lens element is optimized independently with aspheric surfaces to correct chromatic aberrations while maintaining a compact total track length suitable for mobile devices
Solution Approach 2:
The patent employs aspheric surfaces instead of spherical surfaces, changing the geometric parameters of the lens elements. The aspheric coefficients are optimized to correct chromatic aberrations more effectively while reducing the overall system length and improving manufacturing feasibility
2Manufacturing precision
If spherical glass lenses are adhered together to form a doublet for correcting chromatic aberrations, then chromatic aberration correction is improved, but the manufacturing process becomes complicated
Solution Approach 1:
The patent uses four separate plastic lens elements instead of adhering spherical glass lenses together. This segmentation eliminates the complex adhesion process while maintaining chromatic aberration correction through optimized aspheric surface designs and specific refractive power distributions
Solution Approach 2:
The patent adopts plastic lens materials instead of spherical glass lenses, which are easier and cheaper to manufacture using injection molding. The plastic material allows for direct formation of aspheric surfaces without complex adhesion processes, significantly simplifying the manufacturing workflow
3Volume of moving object
If lens elements are assembled compactly within a limited space, then device compactness is improved, but unnecessary light rays reflect too many times affecting image quality
Solution Approach 1:
The patent converts the harmful effect of light reflections into a beneficial control mechanism by strategically placing stops within the compact lens assembly. These stops block unnecessary reflected light rays that would otherwise degrade image quality, while the compact aspheric lens design minimizes the number of reflections through optimized light paths
Solution Approach 2:
The patent introduces stops as intermediary elements within the compact lens assembly to mediate between the compact structure and image quality requirements. The stops selectively block harmful reflected light rays while allowing necessary light paths to pass through, resolving the conflict between compactness and image quality
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 effectively reduces the total track length, corrects chromatic and high-order aberrations, and improves image quality by minimizing unnecessary light reflections and maintaining a compact size suitable for portable electronic devices.
Implementation Method 1
a first lens element with positive refractive power having a convex object-side surface
Implementation Method 2
a second lens element having a concave object-side surface; a focal length of the first lens element is f1; a focal length of the second lens element is f2
Implementation Method 3
at least one of the object-side and image-side surfaces thereof being aspheric; at least one inflection point being formed on at least one of the object-side and image-side surfaces
Implementation Method 4
a first stop disposed between the first lens element and the second lens element; a second stop disposed between the second lens element and the fourth lens element
Data Source
AI summary
The present invention provides an optical imaging lens assembly comprising, in order from an object side to an image side: a first lens element with positive refractive power having a convex object-side surface; a second lens element having a concave object-side surface; a third lens element with positive refractive power; a fourth lens element having a convex object-side surface and a concave image-side surface; a first stop disposed between the first lens element and the second lens element; and a second stop disposed between the second lens element and the fourth lens element. Such an arrangement of optical elements can effectively reduce the total track length of the lens assembly, lower the sensitivity of the optical system, and obtain good image quality.