Eight-Lens Camera Optical System for Large Aperture and Ultra-Thinness
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Solution Overview
Problem
Current camera optical lenses for handheld devices face challenges in achieving optimal imaging quality with large aperture, long focal length, and ultra-thinness due to unreasonable optical power, lens spacing, and lens shape, particularly with the eight-piece lens structure.
Innovation Solution
A camera optical lens design comprising eight lenses with specific refractive power distributions and curvature radii, along with constraints on focal lengths and thicknesses, to improve optical performance and meet the requirements for large aperture, long focal length, and ultra-thinness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an eight-piece lens structure is adopted to improve imaging quality, then optical performance is enhanced, but the lens cannot meet the design requirements for large aperture, long focal length and ultra-thinness due to unreasonable optical power, lens spacing and lens shape
Solution Approach 1:
The patent applies parameter changes by precisely controlling the focal lengths, curvature radii, and thicknesses of all eight lens elements. Specific mathematical relationships are established between these parameters (e.g., focal length ratios, curvature radius relationships) to optimize the overall optical performance while achieving large aperture, long focal length, and ultra-thinness requirements simultaneously.
Solution Approach 2:
The patent divides the optical system into eight distinct lens elements with alternating positive and negative refractive powers. This segmentation allows each lens element to be independently optimized for specific aberration correction functions, enabling the complex requirements of large aperture, long focal length, and thinness to be met through coordinated design of individual elements.
2Device complexity
If traditional three-piece, four-piece, or five-piece lens structures are used, then the lens structure is simpler, but imaging quality is insufficient for high-pixel photosensitive devices
Solution Approach 1:
The patent divides the optical system into eight distinct lens elements with alternating positive and negative refractive powers. This segmentation allows each lens element to be independently optimized for specific aberration correction functions, enabling the complex requirements of large aperture, long focal length, and thinness to be met through coordinated design of individual elements.
Solution Approach 2:
The patent employs a composite lens structure combining eight different lens elements with alternating positive and negative refractive powers. This composite design integrates multiple optical functions within a unified system, achieving superior imaging quality for high-pixel devices while maintaining structural coherence.
3Adaptability or versatility
If the pixel size of photosensitive devices is reduced to achieve better functions, then device functionality is improved, but the requirement for imaging quality from camera optical lenses becomes more stringent
Solution Approach 1:
The patent applies parameter changes by precisely controlling the focal lengths, curvature radii, and thicknesses of all eight lens elements. Specific mathematical relationships are established between these parameters (e.g., focal length ratios, curvature radius relationships) to optimize the overall optical performance while achieving large aperture, long focal length, and ultra-thinness requirements simultaneously.
Solution Approach 2:
The patent converts the challenge of reduced pixel size (which increases imaging quality requirements) into an opportunity to demonstrate superior optical performance. By designing an eight-piece lens system with precise parameter control, the patent achieves imaging quality that exceeds even the stringent requirements imposed by high-pixel photosensitive devices, turning the constraint into a showcase for optical excellence.
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 effectively corrects aberrations and achieves excellent optical imaging performance, meeting the design requirements for large aperture, long focal length, and ultra-thinness, making it suitable for high-pixel CCD and CMOS camera lenses.
Implementation Method 1
a first lens having a positive refractive power
Implementation Method 2
a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eight lens; wherein the camera optical lens satisfies following conditions: 0.95≤f/TTL; −4.00≤f2/f≤−2.00
Data Source
AI summary
The present disclosure discloses a camera optical lens, which includes, from an object-side to an-image side: a first lens having a positive refractive power, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eight lens, which satisfies following conditions: 0.95≤f/TTL; −4.00≤f2/f≤−2.00; and −20.00≤(R5+R6)/(R5−R6)≤−3.00; where TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optic axis; f denotes a focal length of the camera optical lens; f2 denotes a focal length of the second lens; R5 denotes a curvature radius of an object-side surface of the third lens; and R6 denotes a curvature radius of an image-side surface of the third lens. The camera optical lens can achieve good optical performance while meeting the design requirement for large aperture, long focal length and ultra-thinness.