Seven-Lens Optical System for Compact Wide-Angle Imaging
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Solution Overview
Problem
Conventional wide-angle lenses for portable electronic devices face challenges in achieving a compact size while maintaining high imaging quality, as they often compromise on either size or image quality.
Innovation Solution
The optical system comprises seven lenses with specific refractive powers and surface profiles, including a first lens with a positive refractive power and a seventh lens with an inflection point, arranged to satisfy expressions such as tan ω/f > 0.21 and Y2/Y1 + Y3/Y1 + Y4/Y1 < 3.1, which allows for a compact size and wide-angle imaging while correcting aberrations and reducing distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional five-piece or six-piece wide-angle lenses are used, then the lens can capture a vaster scene, but the lens size becomes large and imaging quality deteriorates
Solution Approach 1:
The optical system divides the lens into seven separate lens elements with different refractive powers and surface profiles. This segmentation allows each lens to perform specific optical functions, achieving compact size while maintaining wide-angle field of view and high imaging quality through optimized light path control.
Solution Approach 2:
Different lens elements have different surface profiles (convex, concave, inflection points) and refractive powers assigned to specific positions in the optical path. The seventh lens specifically has an inflection point on its object-side surface, creating local optical characteristics that correct aberrations and enable compact wide-angle imaging.
2Volume of stationary object
If the lens is designed for compact size, then the volume is reduced, but imaging quality and aberration correction deteriorate
Solution Approach 1:
The patent specifies precise parameter ranges for the optical system including tan ω/f > 0.21mm⁻¹ for wide-angle field of view, and Y2/Y1 + Y3/Y1 + Y4/Y1 < 3.1 for compact size control. These parameter optimizations enable compact lens design while maintaining high imaging quality through mathematical optimization of the optical path.
Solution Approach 2:
The seven lens elements are arranged in a nested configuration from object side to image side, with each subsequent lens element positioned to build upon the optical function of the previous ones. This nested arrangement maximizes the use of available space while achieving comprehensive aberration correction and high imaging quality in a compact form factor.
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
This configuration results in a compact wide-angle lens with improved imaging quality, suppressing excessive angle increase in the off-axis field of view and ensuring high image quality by effectively correcting aberrations and distortion.
Implementation Method 1
a first lens L1 with a positive refractive power
Implementation Method 2
a seventh lens L7 with a refractive power, wherein at least one of an object-side surface or an image-side surface of the seventh lens L7 has an inflection point
Data Source
AI summary
An optical system, a lens module, and a terminal device are provided. The optical system includes a first lens and a fifth lens, each of which has a positive refractive power. The optical system also includes multiple lenses with refractive powers. Each of the first lens, a second lens, and a seventh lens has an object-side surface which is convex at an optical axis. Each of the third lens and a fifth lens has an image-side surface which is convex at the optical axis. The seventh lens has an image-side surface which is concave at the optical axis. The seventh lens has an inflection point on the object-side surface and/or the image-side surface. The optical system satisfies the expressions tan ω/ƒ>0.21 mm−1 and Y2/Y1+Y3/Y1+Y4/Y1<3.1.