Five-Lens Optical System for Wide Field of View and Low Distortion
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Solution Overview
Problem
Existing optical lens systems with a wide field of view either suffer from increased distortion or are excessively long, making them unsuitable for miniaturized electronic devices like digital cameras and mobile phones.
Innovation Solution
A five-piece optical lens system with specific refractive power relationships and aspheric surfaces, including a first lens element with negative power, a second with positive power, and a third and fourth with balanced refractive powers, along with a fifth lens element having a negative power and inflection point, optimized to achieve a wide field of view, high resolution, and reduced distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the lens angle is increased to obtain a wider field of view, then the shooting range is improved, but the aberration increases and design complexity increases
Solution Approach 1:
The optical lens system is divided into five distinct lens elements with alternating positive and negative refractive powers. This segmentation allows each element to be optimized for specific aberration correction while collectively achieving a wide field of view, thereby reducing overall design complexity compared to using fewer, more complex elements
Solution Approach 2:
Different lens elements are assigned specific refractive powers and surface curvatures tailored to their local optical functions. The first lens element has negative power with specific convex-concave surfaces for field expansion, while subsequent elements have positive or negative powers optimized for aberration correction at different positions in the optical path
2Manufacturing precision
If more lens elements are used to correct aberration, then the image quality is improved, but the total length of the optical lens system increases
Solution Approach 1:
The five lens elements are arranged in a compact nested configuration where each element is positioned closely to the next, with optimized air gaps between elements. This nesting approach allows multiple elements necessary for aberration correction to be packed into a short total length, preventing the system from becoming excessively long
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements, changing the geometric parameters from traditional spherical to aspheric profiles. This parameter change enables more efficient aberration correction with fewer elements and reduced total length, as aspheric surfaces can correct multiple aberration types simultaneously
3Adaptability or versatility
If traditional lens configurations are used to achieve wide field of view, then the field of view is improved, but distortion increases
Solution Approach 1:
The fifth lens element is specifically designed with negative refractive power and includes inflection points on its surfaces, creating localized optical properties that counteract distortion effects at the periphery of the field of view while maintaining sharpness at the center
Solution Approach 2:
Multiple lens elements including the first, second, third, fourth, and fifth elements incorporate aspheric surfaces with varying curvatures. These non-spherical surface profiles are specifically designed to correct distortion across the wide field of view by adjusting the angle of light rays at different field positions
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 achieves a wide field of view, high resolution, and miniaturization while minimizing distortion and design complexity, suitable for 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 negative refractive power having an image-side surface being concave near the optical axis, at least one of an object-side surface and the 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, a stop, a second lens element with a positive refractive power, a third lens element with a negative refractive power, a fourth lens element with a positive refractive power, a fifth lens element with a negative 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.