Eight-Lens Camera Optical System for Ultra-Thin Long Focal Length
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Solution Overview
Problem
Current miniature camera lenses for handheld devices face challenges in achieving both ultra-thinness and long focal length while maintaining excellent optical performance, due to unreasonable refractive power, lens spacing, and shape in existing eight-piece lens structures.
Innovation Solution
A camera optical lens design comprising eight lenses with specific refractive powers and curvature radii, optimized to meet conditions such as 0.95≤f/TTL, −4.50≤f2/f≤−1.90, and 0.30≤(R13+R14)/(R13−R14)≤1.00, which balances focal length, spherical aberration, and field curvature, allowing for ultra-thinness and improved imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an eight-piece lens structure is adopted to improve imaging quality, then optical performance is improved, but the lens cannot meet the design requirement for ultra-thinness and long focal length
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive power distribution across the eight lenses, specifically setting the second lens with negative refractive power (f2/f between -4.50 and -1.90) and the seventh lens with specific curvature ratios ((R13+R14)/(R13−R14) between 0.30 and 1.00). These parameter adjustments enable the lens to achieve long focal length (f/TTL≥0.95) while maintaining ultra-thin total optical length, resolving the contradiction between imaging quality and compact dimensions.
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 applies segmentation by dividing the optical system into eight distinct lens elements with specific refractive power assignments. The positive-negative-positive-positive-negative-positive-negative arrangement segments the optical correction functions across multiple elements, enabling each lens to address specific aberrations. This segmented approach achieves superior imaging quality for high-pixel devices while the overall structure remains integrated and compact.
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 balance between long focal length and ultra-thinness, effectively correcting aberrations and ensuring excellent optical performance suitable for high-pixel CCD and CMOS camera systems.
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 having a positive refractive power, a fifth lens having a positive refractive power, a sixth lens having a negative refractive power, a seventh lens having a positive refractive power, and an eighth lens having a negative refractive power
Data Source
AI summary
The present disclosure relates to optical lens, and provides a camera optical lens including eight lenses, from an object side to an image side in sequence: 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 having a positive refractive power, a fifth lens having a positive refractive power, a sixth lens having a negative refractive power, a seventh lens having a positive refractive power, and an eighth lens having a negative refractive power; wherein the camera optical lens satisfies the following conditions: 0.95≤f/TTL; −4.50≤f2/f≤−1.90; and 0.30≤(R13+R14)/(R13−R14)≤1.00. The camera optical lens can achieve good optical performance while meeting design requirements for both a long focal length and ultra-thinness.