Five-Lens Optical Imaging Assembly with CT3/CT4 Ratio Control
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Solution Overview
Problem
The challenge is to develop an optical imaging lens assembly for portable electronic devices that achieves a large field-of-view and high imaging quality while minimizing size and weight, balancing aberrations, and optimizing light collection efficiency.
Innovation Solution
The optical imaging lens assembly consists of five lenses with specific refractive powers and surface types, including positive and negative refractive powers, convex and concave surfaces, and controlled center thickness ratios, radii of curvature, and tilt angles, which are strategically arranged to achieve an ultra-thin, high-resolution design with a large field-of-view and balanced aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the number of lenses is reduced to minimize device complexity, then the total track length decreases, but the field-of-view and imaging quality deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive powers, center thicknesses, and curvature radii of each lens. Specifically, the third lens has a center thickness CT3 and the fourth lens has a center thickness CT4 satisfying CT3/CT4≥1.5, which optimizes the optical path and enables a large field-of-view with only five lenses, resolving the contradiction between device complexity and field-of-view.
2Illumination intensity
If the aperture is increased to improve light collection capability, then the imaging quality improves, but the size and weight of the lens assembly increase
Solution Approach 1:
The patent uses parameter changes by optimizing the refractive indices and thickness ratios of the lenses. The configuration where CT3/CT4≥1.5 allows the system to achieve large aperture for improved light collection while maintaining a compact form factor, thus resolving the contradiction between light collection capability and device size.
3Manufacturing precision
If the center thickness of the third lens is increased relative to the fourth lens to correct aberrations, then the imaging quality improves, but the total track length increases
Solution Approach 1:
The patent applies parameter changes by setting the center thickness ratio CT3/CT4≥1.5, which optimizes the aberration correction capability while controlling the total track length. This specific parameter relationship allows the third lens to provide sufficient optical power for aberration correction without excessively increasing the overall length of the lens assembly.
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 enables a wide field-of-view, high imaging quality, and miniaturization of the lens assembly, effectively correcting various aberrations and ensuring efficient light collection, making it suitable for portable electronic devices.
Implementation Method 1
The optical imaging lens assembly includes five lenses with positive and negative refractive powers that sequentially refract light along the optical axis to form an image
Data Source
AI summary
An optical imaging lens assembly is disclosed. The optical imaging lens assembly includes, sequentially along an optical axis from an object side to an image side, a first lens to a fifth lens. The first lens may have a positive refractive power and a concave object-side surface. The second lens may have a positive or a negative refractive power and a concave object-side surface. The third lens may have a positive or a negative refractive power. The fourth lens may have a positive refractive power and a convex image-side surface. The fifth lens may have a negative refractive power, and an object-side surface of the fifth lens and an image-side surface of the fifth lens may both be concave surfaces. A center thickness CT3 of the third lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis satisfy: CT3/CT4≥1.5.