Optical Lens Design for Thin Mobile Camera Modules
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Solution Overview
Problem
The challenge is to reduce the thickness of optical lenses in mobile phones while maintaining good imaging quality, as increasing lens elements to improve imaging quality leads to increased thickness, which restricts the thinness of mobile devices.
Innovation Solution
An optical lens design with specific arrangements and specifications of lens elements, including back focal length, total track length, and maximum image circle, is implemented, where the lens elements have optimized refractive powers, curvature radii, and materials to achieve a thin profile with high imaging performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If more lens elements are used to improve imaging quality, then imaging quality is improved, but lens thickness increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the back focal length (BFL) to be greater than 0.06×TTL and the total on-axis thickness of lens elements (TTL1) to be less than 0.55×MIC. These parameter relationships enable the lens to achieve good imaging quality with reduced thickness by optimizing the distribution and arrangement of lens elements rather than simply increasing their quantity or individual thickness.
2Manufacturing precision
If back focal length is increased to improve imaging performance, then imaging performance is improved, but lens thickness increases
Solution Approach 1:
The patent resolves this contradiction by establishing specific parameter relationships: BFL > 0.06×TTL ensures adequate back focal length for imaging performance, while TTL1 < 0.55×MIC constrains the total thickness. This parameter optimization allows the lens to achieve high imaging performance without proportionally increasing thickness, as the lens elements are arranged and designed to be more space-efficient.
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 results in a thin optical lens with a great back focal length and small total on-axis thickness, allowing for a compact camera module and terminal while maintaining excellent imaging quality and a large aperture.
Implementation Method 1
an optical lens includes a plurality of lens elements arranged from an object side to an image side, where each lens element includes an object-side surface facing the object side and an image-side surface facing the image side
Data Source
AI summary
This application provides an optical lens, a camera module, and a terminal. The optical lens includes a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, and a sixth lens element in sequence from an object side to an image side; and each lens element of the optical lens satisfies the following relations: 0.2≤BFL/TTL≤0.6, and 0.2≤TTL1/MIC≤0.5. Therefore, the optical lens has an improved back focal length BFL and a small total on-axis thickness TTL1 of the plurality of lens elements while achieving high imaging performance. Further, a thickness of the terminal can also be reduced.