Five-element optical lens system for wide field of view
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Solution Overview
Problem
Existing optical lens systems with wide field of view either suffer from increased distortion, complexity, or excessive length, 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 stop, first, second, third, fourth, and fifth lens elements, optimized to achieve a balance between wide field of view, high resolution, and reduced distortion, while maintaining a short length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the lens angle is increased to obtain a wider shooting range, then the field of view is improved, but the aberration increases and the lens design becomes more complex
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 functions: the first element (negative power) controls field of view and distortion, while subsequent elements (positive and negative alternating) correct various aberrations. This modular approach enables wide field of view without excessive complexity in each individual element.
Solution Approach 2:
Different regions of the lens elements have different optical properties. The patent specifies that at least one surface of each lens element is aspheric rather than spherical, allowing different zones of the same lens element to have different curvatures. This local variation in surface quality enables precise control over light rays at different field angles, reducing aberrations across the wide field of view while maintaining manageable design complexity.
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 patent combines multiple functions into a compact five-element configuration. The alternating positive and negative power elements work together to correct both spherical aberration and distortion simultaneously. The stop is positioned between the first and second lens elements to control aperture and reduce aberrations. This merged design achieves high image quality with shorter total length compared to traditional multi-element lenses that use more elements in sequence.
Solution Approach 2:
The patent employs specific parameter relationships to optimize the compact design. The focal lengths of the five lens elements follow specific ratios (e.g., f1/f2 between -2.4 and -1.5, f2/f3 between -1.1 and -0.6), and the Abbe numbers of adjacent elements have controlled differences (e.g., |V2-V3| between 10 and 50). These parameter constraints enable the system to correct aberrations effectively while maintaining a short total length suitable for miniaturized electronic devices.
3Adaptability or versatility
If a wide field of view is achieved with existing designs, then the shooting range is improved, but the distortion increases
Solution Approach 1:
The patent inverts the traditional approach by starting with a negative power first lens element instead of a positive power element. This inverted configuration allows the first element to act as a field lens that expands the field of view while the subsequent positive power elements progressively correct the distortion introduced. This reverse sequencing of optical powers enables wide field of view with reduced distortion compared to conventional designs.
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 with reduced aberration and complexity, achieving high image quality and miniaturization suitable for electronic devices, with focal length and Abbe number relationships that enhance performance and yield.
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 object-side surface being convex near the 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 fifth lens element being aspheric and provided with at least one inflection point
Data Source
AI summary
An optical lens system with a wide field of view includes, in order from the object side to the image side: a stop, a first lens element with a negative refractive power, 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, and 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.