Six-Element Camera Lens for Ultra-Thin Long Focal Length Design
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Solution Overview
Problem
There is a need for a camera optical lens with a long focal length, excellent optical performance, and ultra-thin design suitable for handheld devices and high-pixel imaging systems, which current multi-piece lens structures struggle to achieve effectively.
Innovation Solution
A six-piece lens structure is designed, comprising lenses with specific refractive powers and curvature radii, along with constraints on focal lengths and thicknesses, to balance aberrations and achieve an ultra-thin, high-performance optical lens. The lenses are arranged from object side to image side with particular refractive power distributions and surface curvatures to correct spherical, chromatic, and field aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-piece lens structure is adopted to improve imaging quality, then optical performance is improved, but device thickness increases
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive indices and Abbe numbers of each lens element, along with precise control of curvature radii and thickness ratios. Specifically, the first lens has refractive index 1.50≤nd1<1.70 and Abbe number 20.00<v1<60.00, the second lens has 1.45≤nd2<1.65 and 20.00<v2<50.00, and specific curvature radius ratios are maintained (e.g., -3.00≤R2/R1≤-0.50, -2.00≤R4/R3≤-0.20). These parameter optimizations allow achieving excellent imaging quality with a compact six-element structure that meets the ultra-thin requirement of TTL≤2.00mm.
2Reliability
If a long focal length is achieved, then imaging performance is improved, but device size increases
Solution Approach 1:
The patent achieves long focal length with compact size through precise parameter control of all six lens elements. The focal length ratios are optimized: 0.35≤f1/f≤0.50, -0.40≤f2/f≤-0.20, -0.50≤f3/f≤-0.10, and 1.00≤f5/f≤5.00. The curvature radius ratios are carefully controlled (e.g., -3.00≤R2/R1≤-0.50, -2.00≤R4/R3≤-0.20, 1.50≤(R5+R6)/(R5-R6)≤30.00) to achieve the required focal length while maintaining ultra-thin profile with TTL≤2.00mm.
Solution Approach 2:
The patent divides the optical system into six distinct lens elements with alternating positive and negative refractive powers. This segmentation allows each element to contribute specifically to the overall focal length while correcting aberrations. The first lens (positive), second lens (negative), third lens (negative), fourth lens, fifth lens (positive), and sixth lens work together in a segmented manner to achieve long focal length with compact total optical length.
3Reliability
If a six-piece lens structure is used to correct aberrations, then optical performance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent specifies precise parameter ranges for manufacturing: refractive indices (1.50≤nd1<1.70, 1.45≤nd2<1.65, etc.), Abbe numbers (20.00<v1<60.00, 20.00<v2<50.00, etc.), curvature radius ratios (-3.00≤R2/R1≤-0.50, -2.00≤R4/R3≤-0.20, 1.50≤(R5+R6)/(R5-R6)≤30.00), and thickness ratios (0.05≤d1/TTL≤0.30, 0.02≤d2/TTL≤0.10, etc.). These standardized parameter ranges facilitate mass production while ensuring excellent aberration correction across the six lens elements.
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 six-piece lens structure achieves excellent optical performance, meeting the requirements for long focal length and ultra-thinness, effectively correcting aberrations and ensuring high image quality suitable for mobile and web camera applications.
Implementation Method 1
a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a negative refractive power, a fourth lens, a fifth lens having a positive refractive power and a sixth lens having a negative refractive power
Data Source
AI summary
A camera optical lens includes six-piece lenses, from an object side to an image side, the six-piece lenses are: a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a negative refractive power, a fourth lens, a fifth lens having a positive refractive power and a sixth lens having a negative refractive power. The camera optical lens satisfies conditions of 0.35≤f1/f≤0.50, −30.00≤R4/R3≤−2.00, and 1.50≤(R5+R6)/(R5−R6)≤30.00. The camera optical lens of the present application has excellent optical performances, and meanwhile can meet design requirements of a long focal length and is ultra-thin.