Optical Camera Lens Miniaturization via Refractive Power Distribution
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Solution Overview
Problem
Conventional camera lenses fail to achieve both miniaturization and high resolution, necessitating a new structural design to meet modern requirements.
Innovation Solution
An optical camera lens configuration comprising a sequence of lenses with specific refractive powers and surface curvatures, including a meniscus lens with positive refractive power, a lens with negative refractive power, and a biconvex lens, optimized by conditions such as back focal length, effective focal length, and radius of curvature ratios, along with light path adjusting members to enhance pixel resolution and zoom capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional camera lens structure is used, then manufacturing and design are simpler, but miniaturization and high resolution requirements cannot be satisfied simultaneously
Solution Approach 1:
The lens system is divided into multiple lens elements (first lens with positive refractive power, second lens with negative refractive power, third lens with positive refractive power, and optionally fourth lens) arranged in sequence. Each lens element has specific surface curvature characteristics (convex or concave object/image side surfaces) that work together to achieve high resolution while maintaining compact size. The segmentation allows complex optical functions to be distributed across multiple simpler components.
Solution Approach 2:
The patent applies specific parameter constraints to achieve the desired optical performance: back focal length ratios (BFL/TTL between 0.3-0.7), focal length ratios (f1/f2 between 1.5-3.0, f2/f3 between 0.5-2.0), and surface curvature ratios (R21/R22 between 1.5-3.0). These parameter optimizations enable simultaneous achievement of miniaturization and high resolution by carefully controlling the optical properties of each lens element.
2Manufacturing precision
If lens elements are added to achieve high resolution, then pixel resolution improves, but lens thickness and volume increase
Solution Approach 1:
The patent optimizes the back focal length to total length ratio (BFL/TTL) to be between 0.3 and 0.7, which ensures that the lens maintains a compact overall volume while providing sufficient back focal length for high resolution imaging. This parameter control allows the lens to achieve high pixel resolution without excessive volume increase.
Solution Approach 2:
The patent uses a combination of positive and negative refractive power lens elements arranged in a specific sequence, effectively utilizing optical path folding and space utilization in multiple dimensions. The light path adjusting members (prisms or reflective mirrors) further enable compact design by folding the optical path, achieving high resolution within reduced volume constraints.
3Reliability
If back focal length is increased for high magnification zoom, then optical performance improves, but overall lens length increases
Solution Approach 1:
The patent maintains the back focal length to total length ratio (BFL/TTL) between 0.3 and 0.7, which optimizes the balance between back focal length (needed for high magnification zoom and optical performance) and overall lens length. This parameter constraint ensures that the lens achieves reliable optical performance for high magnification while keeping the physical length minimized for compact design.
Solution Approach 2:
The patent incorporates light path adjusting members (prisms or reflective mirrors) that fold the optical path, effectively increasing the optical path length (and thus back focal length) without proportionally increasing the physical lens length. This dimensional transformation allows high magnification optical zoom capability while maintaining compact overall dimensions.
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 configuration increases back focal length, achieves high magnification optical zoom, and maintains compact dimensions, thereby improving pixel resolution and optical performance while minimizing lens thickness and volume.
Implementation Method 1
The first lens is a meniscus lens with positive refractive power... The second lens is with negative refractive power... The third lens is with positive refractive power
Data Source
AI summary
An optical camera lens including a first lens, a second lens, and a third lens arranged in sequence from the object side to the image side. The first lens has a positive refractive power, and includes a first object side surface and a first image side surface opposite to the first object side surface. The second lens has a negative refractive power, and includes a second object side surface and a second image side surface opposite to the second object side surface, wherein the second image side surface is concave. The third lens has a positive refractive power, and includes a third object side surface and a third image side surface opposite to the third object side surface, wherein both the third object side surface and the third image side surface are convex. The optical camera lens satisfies the following condition: 2<(f+BFL)/OD1<7.