Eight-Lens Camera System for Ultra-Thin Wide-Angle Imaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing camera lenses with eight lenses struggle to achieve a balance of ultra-thinness, wide angle, and low F-number, often compromising on one or more of these parameters due to aberration and optical quality issues.
Innovation Solution
A camera lens design comprising eight lenses with specific refractive powers and Abbe numbers, optimized by aspherical surfaces and conditional formulas to achieve a total track length/image height ratio ≤1.65, a wide angle of 70° or more, and an F-number of 1.45 or less, while correcting on-axis and off-axis color and aberration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the camera lens uses eight lenses with conventional refractive power configurations, then the F-number can be kept bright (1.20-1.60), but the total track length to image height ratio becomes too large (>1.90), failing to achieve ultra-thinness
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive powers, Abbe numbers, and focal length ratios of the eight lenses. Specifically, it sets the 1st lens focal length ratio f1/f between 1.00-1.50, 2nd lens f2/f between -8.00 to -5.00, 3rd lens f3/f between -8.00 to -5.00, and 8th lens f8/f between -1.00 to -0.30, along with Abbe number differences (v1-v2: 30-50, v1-v3: 30-50). These parameter optimizations enable achieving Fno≤1.45 while maintaining TTL/IH≤1.65, resolving the contradiction between bright F-number and ultra-thinness.
2Length of moving object
If the camera lens reduces total track length to achieve ultra-thinness, then the appearance becomes thinner, but the field of view narrows and optical quality deteriorates
Solution Approach 1:
The patent employs aspherical surfaces on multiple lenses (1st, 2nd, 3rd, 4th, 5th, 6th, 7th, and/or 8th lenses) to correct off-axis aberrations including distortion, field curvature, and astigmatism. This allows the lens to maintain a compact TTL/IH ratio≤1.65 while achieving a wide field of view of 70° or more and correcting optical aberrations, thus resolving the contradiction between ultra-thinness and wide-angle performance.
3Reliability
If the camera lens increases the number of lenses to eight elements, then optical quality and aberration correction improve, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent divides the optical system into eight distinct lens elements with specific refractive power configurations (positive, negative, positive, negative, positive, negative, negative, negative). Each lens element is assigned specific functional roles: the 1st lens provides positive refractive power with f1/f≥1.00, the 2nd and 3rd lenses provide negative refractive power for aberration correction, and subsequent lenses fine-tune optical performance. This segmentation enables comprehensive aberration correction while maintaining manageable complexity through systematic design.
4Adaptability or versatility
If the camera lens optimizes for wide angle with field of view 70° or more, then the viewing angle increases, but the F-number increases (becomes darker) and optical aberration worsens
Solution Approach 1:
The patent uses a composite lens system combining eight different lens elements with varying refractive indices and Abbe numbers. The specific configuration includes lenses with positive and negative refractive powers, where the Abbe number differences are controlled (v1-v2: 30-50, v1-v3: 30-50). This composite structure enables achieving a wide field of view of 70° or more while maintaining a bright F-number of 1.45 or less and correcting chromatic and monochromatic aberrations simultaneously.
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 results in a camera lens with excellent optical characteristics, an ultra-thin appearance, and a wide angle, maintaining a bright F-number, effectively addressing the limitations of previous designs.
Implementation Method 1
A camera lens design comprising eight lenses with specific refractive powers and Abbe numbers, optimized by aspherical surfaces to achieve a total track length/image height ratio ≤1.65, a wide angle of 70° or more, and an F-number of 1.45 or less, while correcting on-axis and off-axis color and aberration
Data Source
AI summary
The present disclosure provides a camera lens, constituted by eight lenses, and featuring excellent optical characteristics, an ultra-thin appearance, a wide angle and a bright Fno. The camera lens is configured with, sequentially from an object side: a 1st lens having a positive refractive power, a 2nd lens having a negative refractive power, a 3rd lens having a negative refractive power, a 4th lens having a positive refractive power, a 5th lens having a negative refractive power, a 6th lens having a positive refractive power, a 7th lens having a positive refractive power and an 8th lens having a negative refractive power, and satisfies specified conditional features.