Four-Lens Camera Module Optimizing Flux and Thickness
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Solution Overview
Problem
Existing camera lenses with 4 lenses fail to achieve optimal wide-angle and ultrathin performance due to inadequate distribution of refractive power and shape, resulting in insufficient luminous flux and aberration issues.
Innovation Solution
A camera lens design comprising 4 lenses with specific refractive power distributions and non-spherical surfaces, including a glass plate between the fourth lens and the imaging plane, meeting conditions for refractive power ratios and curvature radii to achieve high-luminous flux and wide-angle performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a 4-lens configuration is used, then the lens can achieve ultrathin structure, but the refractive power distribution is inadequate resulting in insufficient luminous flux
Solution Approach 1:
The patent optimizes the refractive power parameters of each lens element, specifically setting the first lens with positive refractive power (f1/f = 0.85-1.15), second lens with negative refractive power (f2/f = -2.00 to -0.50), third lens with positive refractive power (f3/f = 0.50-0.90), and fourth lens with negative refractive power (f4/f = -0.70 to -0.30). This parameter optimization enables the lens to achieve both ultrathin structure and sufficient luminous flux by balancing the refractive power distribution across all elements.
Solution Approach 2:
The patent assigns different refractive power characteristics to different lens elements based on their specific positions and functions. The first lens has stronger positive refractive power for initial light convergence, while the second lens provides negative refractive power for aberration correction. The third and fourth lenses continue this pattern with optimized refractive powers. This local differentiation of optical properties enables the thin lens structure to achieve adequate luminous flux.
2Area of moving object
If the axial distance between second lens and third lens is increased, then the wide-angle field of view improves, but the overall lens thickness increases
Solution Approach 1:
The patent optimizes the axial distance parameter d4 between the second and third lenses, setting it to 0.05f ≤ d4/f ≤ 0.20, where f is the focal length. This optimized spacing allows the lens to achieve wide-angle field of view (2ω ≥ 80°) while maintaining ultrathin overall thickness. The specific parameter range balances the need for adequate separation to achieve wide angle with the constraint of thin lens structure.
3Length of stationary object
If the first lens has stronger positive refractive power, then the focal length decreases, but the shape becomes improper causing aberration issues
Solution Approach 1:
The patent specifies the refractive power of the first lens within the range 0.85 ≤ f1/f ≤ 1.15 and its shape parameter (R1+R2)/(R1-R2) within -0.50 ≤ (R1+R2)/(R1-R2) ≤ -0.10. This parameter optimization ensures the first lens has sufficient positive refractive power for the required focal length while maintaining proper shape to minimize aberrations. The coordinated control of both parameters resolves the contradiction between focal length and aberration correction.
Solution Approach 2:
The patent employs multiple lens elements with different refractive indices and optical properties to correct aberrations. Each lens element is designed with specific refractive power and shape characteristics that complement each other, creating a composite optical system that achieves both short focal length and high aberration correction performance.
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 design achieves high-luminous flux, wide-angle, and ultrathin performance with excellent optical properties, correcting aberrations and ensuring Fno ≤ 2.2, 2ω ≥ 80°, and TTL/IH ≤ 1.5.
Implementation Method 1
a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power and a fourth lens with negative refractive power
Data Source
AI summary
The present invention discloses a camera lens composed of 4 ultrathin and high-luminous flux wide angle lenses with excellent optical properties. The lenses are lined up in turn from the object side as follows: a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, and a fourth lens with negative refractive power. The camera lens meets specific conditions.