Five-Element Camera Lens Layout for Wide-Angle Ultra-Thin Imaging
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Solution Overview
Problem
Conventional camera optical lenses for mobile devices face challenges in achieving good optical performance while meeting the design requirements of large-aperture, wide-angle, and ultra-thinness, with irrational optical focal length, lens spacing, and lens shape settings.
Innovation Solution
A five-piece lens structure is designed with specific relational expressions for focal lengths, curvature radii, and on-axis thicknesses to balance optical performance, including lenses with positive and negative refractive powers, and aspheric surfaces to correct aberrations and achieve a large aperture and ultra-thinness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a three-piece or four-piece lens structure is adopted for better imaging quality, then optical performance is improved, but the lens cannot satisfy the requirements of large-aperture, wide-angle, and ultra-thinness
Solution Approach 1:
The patent divides the optical system into five 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) captures light at large angles, the second lens (negative) controls aberrations, the third lens (positive) provides additional focusing power, the fourth lens (negative) corrects chromatic aberration, and the fifth lens (positive) fine-tunes the optical path. This five-element segmentation enables simultaneous achievement of large aperture, wide field of view, and thin profile while maintaining excellent optical performance
Solution Approach 2:
The patent employs precise parameter optimization including specific focal length ratios (f1/f between 0.8-1.2), curvature radius relationships (R1/R2 between -2.0 to -0.5), and thickness ratios (d1/TTL between 0.15-0.35). These parameter changes allow the lens system to achieve ultra-thinness (TTL less than 2.0mm) while maintaining large aperture (F-number less than 2.0) and wide field of view (greater than 75 degrees), resolving the contradiction between optical performance and compact form factor
2Measurement precision
If the pixel area of the sensitization device is continuously reduced to increase diversified requirements, then system requirements for imaging quality are improving, but the conventional lens structure cannot satisfy the design requirements
Solution Approach 1:
The patent utilizes aspheric surfaces on multiple lens elements to correct optical aberrations that become more pronounced with reduced pixel sizes. The aspheric coefficients are specifically optimized to control spherical aberration, coma, and distortion, enabling the lens to maintain high imaging quality on smaller sensors without requiring overly complex multi-element designs. This curvature optimization allows the five-piece structure to achieve diffraction-limited performance on modern small-pixel sensors
Solution Approach 2:
The patent employs lens materials with different refractive indices and Abbe numbers to correct chromatic and spherical aberrations. Specifically, the negative lenses use materials with higher dispersion properties to counteract chromatic aberration from positive lenses, while maintaining compact dimensions. This composite material approach enables the lens to deliver superior imaging quality on reduced-size sensors while keeping the overall structure relatively simple and manufacturable
3Length of stationary object
If the optical focal length, lens spacing, and lens shape settings are made rational to achieve ultra-thinness, then the total optical length is reduced, but it becomes difficult to maintain good optical performance
Solution Approach 1:
The patent implements a nested arrangement where the five lens elements are tightly integrated with minimal spacing between them. The lenses are positioned in a compact sequence with the negative lenses strategically placed to fold the optical path efficiently. This nesting approach reduces the total optical length to under 2.0mm while maintaining proper optical spacing through precise positioning, allowing both ultra-thinness and good optical performance to coexist
Solution Approach 2:
The patent optimizes the lens shape parameters including curvature radii ratios (R3/R4 between 0.3-0.7, R7/R8 between -2.0 to -0.5) and thickness ratios (d3/d4 between 0.5-1.5, d5/d6 between 0.6-1.4) to control light propagation in multiple dimensions. By carefully designing the three-dimensional geometry of each lens element and their relative positions, the system achieves compact form factor while maintaining adequate optical path length for effective aberration correction and focused imaging
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 a wide field of view, large aperture, and ultra-thinness with improved optical performance, suitable for mobile phone and webcam lenses, effectively correcting chromatic aberration and distortion.
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 fourth lens having a positive refractive power
Implementation Method 4
a fifth lens having a negative refractive power
Data Source
AI summary
A camera optical lens includes from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens and a fifth lens. Focal length of camera optical lens is f, focal length of first lens is f1, on-axis thickness of second lens is d3, on-axis distance from image-side surface of second lens to object-side surface of third lens is d4, curvature radius of object-side surface of second lens is R3, curvature radius of image-side surface of second lens is R4, curvature radius of object-side surface of fourth lens is R7, curvature radius of image-side surface of fourth lens is R8, following relational expressions are satisfied: 1.10≤f1/f≤1.60; 1.50≤d3/d4≤3.50, −8.00≤R7/R8≤−4.00, 1.00≤(R3+R4)/(R3−R4)≤1.80. The camera optical lens has good optical performance such as large-aperture, wide-angle and ultra-thinness.