Four-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 suffer from increased distortion and complex design, and are either too long or require multiple lens elements, making them unsuitable for miniaturized electronic devices.
Innovation Solution
A four-piece optical lens system with specific refractive power distributions and aspheric surfaces, including a stop, first, second, third, and fourth lens elements with positive and negative powers, optimized to achieve a wide field of view, high resolution, and reduced aberration, 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 becomes larger and the lens design becomes more complex
Solution Approach 1:
The optical lens system is divided into four 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, resolving the contradiction between field of view and design complexity
Solution Approach 2:
Different lens elements are assigned different refractive powers and surface curvatures tailored to their specific positions in the optical path. The first element has positive power with convex surfaces for light gathering, while subsequent elements have negative power with concave surfaces for aberration control, allowing local optimization that enables wide field of view without excessive overall complexity
2Adaptability or versatility
If more lens elements (5-6 pieces) are used to obtain a wide field of view, then the field of view is improved, but the distortion is increased
Solution Approach 1:
The patent employs aspheric surfaces on all lens elements, changing the geometric parameter from spherical to aspheric. This parameter change enables better control of light rays across the wide field of view, reducing distortion while maintaining the four-element configuration. The aspheric coefficients are specifically optimized to counteract distortion effects that would otherwise require more elements to control
3Length of moving object
If the total length of the optical lens system is reduced for miniaturization, then the device size is improved, but the field of view and aberration control become more difficult
Solution Approach 1:
The four lens elements are arranged in a compact nested configuration along the optical axis with minimized spacing. The alternating positive-negative power elements create a telecentric-like effect that allows for shorter total length while maintaining wide field of view capability. This nested arrangement enables miniaturization without sacrificing optical performance
4Length of moving object
If the total length of the optical lens system is reduced for miniaturization, then the device size is improved, but the aberration control becomes more difficult
Solution Approach 1:
The optical system uses composite design combining spherical and aspheric surfaces across four different lens elements with alternating refractive powers. This composite approach allows aberration control in a compact form factor, as each element contributes differently to the overall wavefront correction, enabling short length while maintaining manufacturing precision for aberration control
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, improved resolution, and reduced distortion, making it suitable for miniaturized electronic devices like digital cameras and mobile phones with a simplified design.
Implementation Method 1
a first lens element with a positive refractive power, having an object-side surface being convex near an optical axis and an image-side surface being convex near the optical axis
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 positive refractive power, a second lens element with a negative refractive power, a third lens element with a positive refractive power, and a fourth lens element with a negative refractive power. The focal length of the first lens element is f1, the focal length of the second lens element and the third lens element combined is f23, and they satisfy the relation: 0.4<f1/f23<1.7. When the above relation is satisfied, a wide field of view can be obtained and the resolution can be improved evidently.