Five-Element Optical Imaging Lens Assembly for Stray Light Reduction
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Solution Overview
Problem
Conventional compact optical systems for electronic devices, such as smartphones and tablets, fail to meet the demands for high resolution and image quality due to uneven refractive power distribution, leading to issues with stray light and sensitivity, particularly in peripheral regions and back focal length.
Innovation Solution
An optical imaging lens assembly comprising five non-cemented lens elements with specific refractive powers and surface curvatures, including a first lens with positive refractive power, a second lens with convex surfaces, a third lens with refractive power, a fourth lens with aspheric surfaces, and a fifth lens with negative refractive power, arranged to optimize light distribution and reduce aberrations, while maintaining a compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional four-element lens structure is used, then the optical system can be compact, but the image quality and resolution cannot satisfy high-end requirements
Solution Approach 1:
The patent divides the optical system into five separate non-cemented lens elements instead of using a conventional four-element structure. Each lens element is independently designed with specific refractive power and surface curvature characteristics, allowing for better correction of optical aberrations while maintaining a compact form factor suitable for mobile devices
Solution Approach 2:
Different lens elements are assigned specific local optical characteristics: the first lens element has positive refractive power with a convex object-side surface, the second lens element has positive refractive power with convex surfaces, the third lens element has negative refractive power, the fourth lens element has positive refractive power with aspheric surfaces, and the fifth lens element has negative refractive power with concave surfaces. This localized optimization of optical properties improves overall image quality
2Measurement precision
If five-element lens structure is used to enhance resolution, then image quality improves, but refractive power is unevenly distributed causing stray light and sensitivity issues
Solution Approach 1:
The patent optimizes the distribution of refractive power across the five lens elements by adjusting key parameters: the first lens element has positive refractive power with focal length f1, the second lens element has positive refractive power with focal length f2, the third lens element has negative refractive power, the fourth lens element has positive refractive power with aspheric surfaces, and the fifth lens element has negative refractive power. This balanced parameter distribution ensures even light refraction, reduces peripheral incident angles, and minimizes stray light while maintaining high resolution
Solution Approach 2:
The patent employs aspheric surfaces on the fourth lens element (both object-side and image-side surfaces) and the fifth lens element (both object-side and image-side surfaces) to better control light paths. The aspheric curvature profiles help distribute refractive power more evenly and reduce optical aberrations, thereby improving image quality while controlling stray light
3Device complexity
If refractive power is concentrated on a single lens element, then the optical system can be simpler, but sensitivity increases and performance deteriorates
Solution Approach 1:
Instead of concentrating refractive power in a single lens element, the patent segments the optical power across five distinct lens elements. Each element contributes a portion of the total refractive power, with the first and second elements providing positive power, the third element providing negative power, and the fourth and fifth elements providing additional positive and negative power respectively. This segmentation distributes the optical function, reducing sensitivity to manufacturing tolerances and improving overall reliability
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 reduces stray light, improves image quality, and maintains a compact size by evenly distributing refractive power and correcting aberrations, enhancing the sensitivity and resolution of the optical imaging lens assembly.
Implementation Method 1
an optical imaging lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element
Data Source
AI summary
An optical imaging lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The second lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The third lens element has refractive power. The fourth lens element with positive refractive power has an object-side surface being convex and an image-side surface being convex in a paraxial region thereof. The fifth lens element with negative refractive power has an object-side surface being concave and an image-side surface being concave in a paraxial region thereof, wherein the image-side surface thereof has at least one convex shape in an off-axis region thereof.