Five-Lens Optical System for Wide Field of View and Compact Design
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Solution Overview
Problem
Conventional optical lens systems for portable electronic devices face challenges in achieving a wide field of view, high resolution, short total track length, low material cost, and low sensitivity to assembly tolerance, often resulting in large distortion and increased complexity.
Innovation Solution
A miniaturized five-piece optical lens system comprising specific lens elements with positive and negative refractive powers, made of plastic materials, and an aperture stop, optimized with precise surface profiles and Abbe numbers to satisfy specific conditions for refractive power distribution, chromatic aberration correction, and assembly sensitivity reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If five to six lens elements are used to provide wider angle of view, then the field of view is improved, but the total track length becomes long and distortion increases
Solution Approach 1:
The patent applies parameter changes by using a first lens element with negative refractive power and subsequent lens elements with positive refractive power, creating a specific refractive power distribution that enables wide-angle imaging with reduced total track length. The aspheric surface parameters are also optimized to control distortion while maintaining compact dimensions.
Solution Approach 2:
The patent employs composite material design by combining plastic materials with different Abbe numbers (Vd2 and Vd3) in the lens elements. This allows for chromatic aberration correction while maintaining a compact structure, resolving the contradiction between wide field of view and short total track length.
2Adaptability or versatility
If five to six lens elements are used to provide wider angle of view, then the field of view is improved, but distortion becomes large
Solution Approach 1:
The patent applies spheroidality by incorporating aspheric surfaces on multiple lens elements, including the first lens element and subsequent elements. The aspheric coefficients are optimized to correct distortion while maintaining wide-angle performance, effectively resolving the contradiction between field of view and distortion control.
3Measurement precision
If more than two pieces of high-index lens elements are used, then the refractive power is improved, but the cost increases and sensitivity to assembly tolerance increases
Solution Approach 1:
The patent applies parameter changes by using a balanced refractive power distribution across five lens elements rather than concentrating power in high-index elements. This approach achieves the required refractive power with standard plastic materials, reducing both cost and sensitivity to assembly tolerance.
4Measurement precision
If more than two pieces of high-index lens elements are used, then the refractive power is improved, but the sensitivity to assembly tolerance increases
Solution Approach 1:
The patent applies parameter changes by distributing refractive power across multiple lens elements with moderate individual powers rather than using few high-power elements. This distribution reduces the sensitivity to assembly tolerance while achieving the required overall refractive power.
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 provides a wide field of view, high resolution, and reduced sensitivity to assembly tolerance while maintaining a compact size and low material costs, effectively addressing the limitations of existing lens systems.
Implementation Method 1
a first lens element with a positive refractive power having an object-side surface being convex near the optical axis... a second lens element with a negative refractive power... a third lens element with a positive refractive power... a fourth lens element with a positive refractive power... a fifth lens element with a negative refractive power
Data Source
AI summary
An optical lens system includes an aperture stop and an optical assembly, the optical assembly includes, in order from an object side to an image side: a first lens element with a positive refractive power; a second lens element with a negative refractive power; a third lens element with a positive refractive power; a fourth lens element with a positive refractive power; a fifth lens element with a negative refractive power; the aperture stop is located between an image-side surface of the first lens element and an object to be photographed. The optical lens system satisfies the following conditions: 0.55<TD/CA52<0.73; 20<Vd3−Vd2<40; 80<FOV<100; and 1.0<TL/ImgH<1.6.