Five-Lens Imaging System with Aspheric Inflection Points
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Solution Overview
Problem
Conventional electronic devices with multiple cameras face challenges in achieving high image resolution with a small field of view due to the size constraints of compact optical systems, leading to limited image quality.
Innovation Solution
An imaging lens system comprising five lens elements with specific refractive powers and surface configurations, including aspheric surfaces and inflection points, is designed to optimize image quality and size, featuring conditions such as 7.0<(f×ImgH)/[TL×(f−TL)] and 0<BL/T45<3.0 to enhance image resolution and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the optical system uses a smaller image sensor to reduce size, then the compactness is improved, but the image resolution deteriorates
Solution Approach 1:
The patent employs aspheric surfaces on multiple lens elements (first, second, third, fourth, and fifth lens elements) to correct optical aberrations. The aspheric profiles allow for better control of light rays across the entire image height, enabling high resolution even with compact sensor sizes. Specific aspheric coefficients are optimized to minimize distortion and maintain sharpness at the image periphery.
Solution Approach 2:
The patent implements specific parameter relationships to optimize performance: the focal length f is constrained to 2.0mm<f<4.0mm, the ratio T45/f is controlled within 0.10< T45/f<0.30, and the curvature radii of the fifth lens element follow specific relationships (|R9|>0.50f and |R10|>0.50f). These parameter optimizations enable compact design while maintaining high image quality.
2Adaptability or versatility
If the optical system is designed with smaller field of view for zoom functionality, then the zoom effect is improved, but the image sensor size must be reduced which worsens the image quality
Solution Approach 1:
The patent designs a universal optical system that can achieve multiple field of view requirements (wide-angle and telephoto) through a single lens configuration. By optimizing the five-lens system with specific parameter relationships, the same optical system delivers high-quality images across different zoom levels without requiring multiple sensors of different sizes.
Solution Approach 2:
The patent applies different optical characteristics to different regions of the lens system. The fifth lens element specifically addresses off-axis ray control with its aspheric surfaces and inflection points, while the earlier lens elements handle primary focusing. This localized optimization ensures high resolution across the entire image area regardless of field of view setting.
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 solution enables a compact imaging lens system with high image resolution and improved optical performance, suitable for compact devices, by balancing refractive power and structural properties, thereby enhancing the image quality and zoom functionality.
Implementation Method 1
an imaging lens system includes five lens elements. The five lens elements are, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element
Implementation Method 2
At least one of an object-side surface of the fifth lens element and an image-side surface of the fifth lens element has at least one inflection point. The object-side surface and the image-side surface of the fifth lens element are both aspheric
Data Source
AI summary
An imaging lens system includes five lens elements, which are, in order from an object side to an image side: a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. At least one of an object-side surface and an image-side surface of the fifth lens element has at least one inflection point. The object-side surface and the image-side surface of the fifth lens element are both aspheric.