Five-Piece Optical Lens System for Wide Field of View
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional optical lens systems for electronic devices, such as smartphones and cameras, face challenges in achieving a wide field of view with high resolution while maintaining a short length and minimizing distortion, as they often result in insufficient field of view and excessive length.
Innovation Solution
A five-piece optical lens system comprising specific lens elements with aspheric surfaces and refractive powers, including a first lens element with negative power, a second lens element with positive power, a third lens element with positive power, a fourth lens element with negative power, and a fifth lens element with positive power, optimized by specific focal length ratios and Abbe number relationships to achieve a wide field of view, high resolution, and reduced distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional four-lens element systems are used, then the device complexity is reduced, but the field of view is insufficient and total length is too long
Solution Approach 1:
The optical lens system divides the imaging function into five distinct lens elements with alternating positive and negative refractive powers. This segmentation allows each element to contribute specifically to expanding the field of view while maintaining compact overall dimensions, achieving FOV greater than 85 degrees with controlled total length
Solution Approach 2:
The patent employs aspheric surfaces on all lens elements with specifically optimized curvature radii, thicknesses, and refractive indices. The aspheric coefficients and focal length ratios are precisely controlled to expand the field of view while preventing excessive total length and minimizing distortion
2Adaptability or versatility
If more lens elements are added to increase field of view, then the field of view is improved, but the total length becomes too long
Solution Approach 1:
The optical system uses a dynamic balance of positive and negative refractive powers across the five lens elements. This alternating configuration allows light rays to be redirected efficiently, achieving wide field of view coverage within a compact total length by dynamically adjusting the optical path through each element
Solution Approach 2:
Specific focal length ratios between adjacent lens elements are controlled to optimize the optical path. The aspheric surface parameters and element spacing are precisely adjusted to achieve FOV greater than 85 degrees while maintaining total length under control, preventing excessive elongation
3Adaptability or versatility
If two lens groups with 5-6 pieces of lens elements are used to obtain wide field of view, then the field of view is improved, but the distortion is increased
Solution Approach 1:
Each of the five lens elements features locally optimized aspheric surfaces with specific curvature distributions. The aspheric coefficients are tailored for each element's position in the optical train, allowing precise control of ray angles across the wide field of view to minimize distortion while maintaining FOV greater than 85 degrees
Solution Approach 2:
The patent precisely controls the focal length ratios between adjacent lens elements and optimizes the aspheric surface parameters for each element. This parameter optimization ensures that even with five lens elements providing wide field of view, the distortion remains minimized through careful adjustment of optical path characteristics
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 system effectively provides a wide field of view, high resolution, and reduced distortion, while minimizing the total length, making it suitable for miniaturized electronic devices.
Implementation Method 1
a first lens element with a negative refractive power having an object-side surface being convex near an optical axis and an image-side surface being concave near the optical axis, at least one of the object-side surface and the image-side surface of the first lens element being aspheric
Implementation Method 2
a fifth lens element with a positive refractive power having an object-side surface being convex near the optical axis, at least one of the object-side surface and an image-side surface of the fifth lens element being aspheric and provided with at least one inflection point
Data Source
AI summary
A five-piece optical lens system with a wide field of view includes, in order from the object side to the image side: a first lens element with a negative refractive power, the first lens element being made of glass, a second lens element with a positive refractive power, a stop, a third lens element with a positive refractive power, a fourth lens element with a negative refractive power, a fifth lens element with a positive refractive power. Such arrangements can provide a five-piece optical lens system which has a wide field of view, high resolution, short length and less distortion.