Four-Lens Camera Optics for Long Focal Length in Ultra-Thin Modules
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Solution Overview
Problem
There is an urgent need for an ultra-thin camera optical lens with long focal length and excellent optical features to meet the demands of modern handheld devices such as smartphones and digital cameras, which require high imaging quality and miniaturization.
Innovation Solution
A camera optical lens design comprising four lenses, each with specific refractive powers and curvature radii, including a first lens with positive power, a second lens with negative power, a third lens with negative power, and a fourth lens with positive power, optimized by specific ratios and conditions to achieve long focal length and ultra-thinness, while minimizing chromatic aberration and distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a multi-lens structure is used to improve imaging quality, then imaging quality is improved, but device thickness increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the focal lengths, curvature radii, and spacing of each lens element. Specific ratios are defined (0.50≤f12/f≤1.20, 1.50≤f4/f≤5.00, -10.00≤R2/R1≤-1.20) to optimize the optical system. This allows achieving long focal length and good imaging quality while maintaining ultra-thin profile through mathematical optimization of optical parameters
Solution Approach 2:
The optical system is divided into four distinct lens elements with alternating positive and negative refractive powers. This segmentation allows each lens to be optimized for specific functions: the first lens (positive) provides primary focusing, the second lens (negative) corrects aberrations, the third lens (negative) further refines optical performance, and the fourth lens (positive) completes the imaging. This modular approach enables compact design while maintaining high imaging quality
2Volume of moving object
If pixel size of photosensitive device is reduced to minimize device size, then device miniaturization is achieved, but imaging quality deteriorates
Solution Approach 1:
The patent compensates for the reduced pixel size by optimizing optical parameters. The specific ratios defined (0.50≤f12/f≤1.20, 1.50≤f4/f≤5.00) ensure that light is properly focused and distributed across the smaller pixel array, maintaining imaging quality despite miniaturization
Solution Approach 2:
The patent uses asymmetric lens design with alternating positive and negative refractive powers. The curvature radii ratios (-10.00≤R2/R1≤-1.20) create asymmetric surface profiles that effectively direct and focus light onto the smaller pixel elements, compensating for the reduced sensor size and maintaining image quality
3Manufacturing precision
If long focal length is achieved to improve imaging quality, then imaging quality is improved, but device thickness increases
Solution Approach 1:
The patent achieves long focal length in a compact form by segmenting the optical system into four lenses with alternating positive and negative powers. This allows the effective focal length to be extended through the combined optical effect of multiple elements rather than requiring a single long lens, thereby achieving long focal length without proportionally increasing device thickness
Solution Approach 2:
The patent uses precise parameter control with defined ratios (0.50≤f12/f≤1.20, 1.50≤f4/f≤5.00) to optimize the relationship between individual lens focal lengths and the total system focal length. This mathematical optimization enables achieving long effective focal length while keeping the physical thickness of each lens element and the overall assembly minimal
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 lens design achieves good optical performance with long focal length and ultra-thinness, suitable for high-pixel CCD and CMOS camera elements, effectively correcting aberrations and ensuring high imaging quality.
Implementation Method 1
a first lens having a positive refractive power
Implementation Method 2
a second lens having a negative refractive power
Implementation Method 3
a third lens having a negative refractive power
Implementation Method 4
a fourth lens having a positive refractive power
Data Source
AI summary
The present disclosure relates to the technical field of optical lens and discloses a camera optical lens satisfying following conditions: 0.50≤f12/f≤1.20; 1.50≤f4/f≤5.00; −10.00≤R2/R1≤−1.20; where f12 denotes a combined focal length of the first lens and the second lens, f denotes a focal length of the camera optical lens, f4 denotes a focal length of the fourth lens, R2 denotes a central curvature radius of an image-side surface of the first lens, and R1 denotes a central curvature radius of an object-side surface of the first lens. The camera optical lens in the present disclosure satisfies a design requirement of long focal length and ultra-thinness while having good optical functions.