6P Lens Design for Thin Mobile Phone Front Panels
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Solution Overview
Problem
The challenge is to design a high-definition optical lens that occupies minimal space on thin mobile phone front panels while meeting the increasing demands for camera quality, requiring a simplified structure, reduced lens weight, and minimized distortion.
Innovation Solution
A 6P lens configuration comprising specific types and curvatures of lenses along the optical axis, including a positive first lens, negative second lens, positive third lens, negative fourth lens, positive fifth lens, and negative sixth lens, with optimized focal lengths and total optical lengths to reduce size and correct aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional lens structure is used, then the lens can achieve basic imaging function, but the lens diameter and total length become large, occupying excessive space on thin mobile phone front panels
Solution Approach 1:
The lens is divided into 6 individual lens elements (L1-L6) with alternating positive and negative optical powers, each contributing to different aspects of light correction and focusing. This segmentation allows complex optical functions to be distributed across multiple simpler elements, achieving high-definition imaging in a compact configuration
Solution Approach 2:
The patent employs specific parameter relationships between lens elements, including focal length ratios (F1/EFL = 0.20-0.40, F5/EFL = 0.60-0.85), curvature radii, and thickness ratios (0.05<T1/|F1|<0.15). These parameter optimizations enable the lens to achieve high imaging quality while maintaining a compact form factor suitable for thin mobile phones
2Volume of moving object
If the lens structure is simplified to reduce size, then the lens occupies less space, but the imaging clarity and distortion control deteriorate
Solution Approach 1:
The lens system uses composite optical design combining 6 different lens elements with alternating positive and negative optical powers. This composite structure integrates multiple optical functions (focusing, aberration correction, field flattening) into a single compact lens assembly, achieving high-definition imaging without requiring excessive space
Solution Approach 2:
Each lens element serves multiple functions: L1 and L3 (positive lenses) provide primary focusing power, while L2, L4, and L6 (negative lenses) correct spherical and chromatic aberrations. The fifth lens L5 specifically addresses off-axis aberrations. This multi-functional design enables compact size while maintaining imaging clarity
3Length of moving object
If the lens total length is reduced for ultra-thin mobile phones, then the device becomes thinner, but the lens distortion and off-axis aberrations increase
Solution Approach 1:
The lens design incorporates dynamic optimization of the optical path through carefully controlled curvature radii and thickness ratios. The conditional expressions (0.05<T1/|F1|<0.15, 0.60<F5/EFL<0.85) ensure that light rays are properly directed through the compact lens system, minimizing distortion and off-axis aberrations even with reduced total length
Solution Approach 2:
The patent addresses lens distortion by optimizing parameters in multiple dimensions: curvature radii (R1-R12), thickness (T1-T6), and spacing (D1-D6). This multi-dimensional parameter optimization allows the lens to achieve low distortion and corrected off-axis aberrations within a shortened total length, enabling ultra-thin mobile phone design
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 6P lens achieves high-definition imaging with a compact size, reducing lens distortion and off-axis aberrations, suitable for ultra-thin mobile phones and larger chip sizes, enhancing light transmission and imaging stability.
Implementation Method 1
A 6P lens configuration comprising specific types and curvatures of lenses along the optical axis, including a positive first lens, negative second lens, positive third lens, negative fourth lens, positive fifth lens, and negative sixth lens, with optimized focal lengths and total optical lengths to reduce size and correct aberrations
Data Source
AI summary
A 6P lens suitable for small mounting hole, comprising an aperture stop, a first, second, third, fourth, fifth and sixth lens along the optical axis from the object side to the image side. An object surface of the first lens is convex, and changes from the convex surface to the concave surface, an image surface is concave, changes from the concave surface to the convex surface from the near optical axis to the periphery; An object surface of the second lens is convex and an image surface is concave; An object surface of the third lens is concave, an image surface is convex; An object surface of the fourth lens is concave, an image surface is convex; An object surface of the fifth lens is concave, an image surface is convex; An object surface of the sixth lens is a concave surface, and its image surface is convex.