Nine-Lens Wide-Angle Optical System for Compact Mobile Imaging
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Solution Overview
Problem
Existing wide-angle lens systems for mobile devices are challenging to miniaturize while maintaining high resolution and correcting distortion, due to limitations in lens design and refractive power distribution.
Innovation Solution
A small wide-angle lens system comprising nine lenses, with specific refractive powers and surface shapes, including aspherical surfaces, to reduce the effective diameter of the first lens and minimize the total track length, thereby achieving a compact and lightweight design while correcting distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lenses is increased to achieve high resolution and wide angle, then image quality and field of view are improved, but the total track length and system size increase
Solution Approach 1:
All surfaces of the first to ninth lenses are designed as aspherical surfaces, which enables better control of light rays and reduces the total track length while maintaining high resolution and wide angle performance
Solution Approach 2:
The patent applies specific parameter constraints to lens refractive powers and surface curvatures (e.g., |P1|≥0.003, P2≤-0.003, P3≥0.003, and various curvature ratio constraints) to optimize the optical system for compact size while achieving high resolution
2Volume of moving object
If the effective diameter of the first lens is reduced to miniaturize the camera, then device size is reduced, but light gathering ability and image brightness decrease
Solution Approach 1:
Aspherical surfaces on all lenses enable efficient light path control within a compact form factor, maintaining brightness despite reduced lens diameter
Solution Approach 2:
The patent specifies refractive power constraints and curvature ratios that optimize light gathering efficiency in the compact lens design
3Length of stationary object
If lens refractive powers and shapes are optimized for compact size, then total track length is reduced, but distortion correction becomes more difficult
Solution Approach 1:
Aspherical surfaces provide the necessary degrees of freedom to correct distortion while maintaining a compact total track length, as the curved surfaces can precisely control off-axis light rays
Solution Approach 2:
The patent applies specific parameter constraints including curvature ratios (e.g., |R1+R2|/|R5+R6|≥0.5, |R3+R4|/|R7+R8|≥0.5) and refractive power relationships that simultaneously achieve compact size and distortion correction
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 proposed lens system achieves a compact size and lightweight design, enabling high-resolution wide-angle images with improved distortion correction, making it suitable for thin or small camera modules, such as smartphones.
Implementation Method 1
all surfaces of the first to ninth lenses are aspherical surfaces
Data Source
AI summary
Disclosed is a small wide-angle lens system including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens sequentially arranged from an object, wherein the first lens has a convex object-side surface, the third lens has a negative refractive power, the fourth lens has a concave image-side surface, the sixth lens has a concave object-side surface and a concave image-side surface, the ninth lens has a negative refractive power and a concave object-side surface, all surfaces of the first to ninth lenses are aspherical surfaces, the refractive power P1 of the first lens satisfies |P1|<0.01, and Fno of the lens system satisfies Fno<1.6.