Eight-Lens Camera Optical System for Ultra-Thin Wide-Angle Imaging
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Solution Overview
Problem
Current camera lenses with an eight-piece structure face challenges in achieving high optical performance while meeting the requirements for ultra-thin, wide-angle lenses with a big aperture, due to irrational settings in refractive power, lens spacing, and lens shape.
Innovation Solution
A camera optical lens design comprising eight lenses, with specific conditions for focal lengths, refractive indices, and curvature radii, balances spherical aberration, corrects aberrations, and achieves ultra-thin, wide-angle performance by optimizing the distribution of refractive power and lens shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an eight-piece lens structure is used to improve imaging quality, then optical performance is improved, but the lens structure cannot achieve ultra-thin dimensions while maintaining wide-angle and big aperture requirements
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive indices of specific lenses (n2 between 1.60-1.80 for the second lens, n3 between 1.55-1.70 for the third lens) and controlling focal length ratios (f1/f between 3.80-5.00) to achieve ultra-thin dimensions while maintaining wide-angle and big aperture capabilities. This resolves the contradiction by adjusting optical parameters to improve imaging quality without increasing lens thickness.
2Ease of manufacture
If traditional three-piece to six-piece lens structures are used, then manufacturing 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 pieces with specific refractive power distributions (+−+++−+− pattern). This segmentation allows each lens to be optimized for specific aberration corrections, achieving high imaging quality suitable for high pixel photosensitive devices while maintaining reasonable manufacturing complexity through standardized lens design procedures.
3Adaptability or versatility
If the focal length ratio f1/f is outside the range of 3.80-5.00, then the first lens design is more flexible, but spherical aberration cannot be effectively balanced
Solution Approach 1:
The patent applies parameter changes by constraining the focal length ratio f1/f to the specific range of 3.80-5.00. This parameter optimization balances spherical aberration effectively while maintaining adequate design flexibility for achieving ultra-thin, wide-angle, and big aperture characteristics in the lens system.
4Ease of manufacture
If the refractive index n3 of the third lens is outside the range of 1.55-1.70, then material selection is broader, but aberration correction performance deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive index of the third lens to fall within the range of 1.55-1.70. This parameter selection achieves optimal aberration correction performance while maintaining a practical material selection range that includes common optical glass types, thus resolving the contradiction between material availability and optical performance.
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 high optical performance and a big aperture, making it suitable for mobile phone and webcam applications with high pixel imaging elements, while ensuring ultra-thin and wide-angle capabilities.
Implementation Method 1
a first lens L1 having a positive refractive power, a second lens L2 having a negative refractive power, a third lens L3 having a positive refractive power
Data Source
AI summary
The present disclosure relates to the field of optical lenses and provides a camera optical lens. The camera optical lens includes, from an object side to an image side: a first lens; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; a seventh lens; and an eighth lens. The camera optical lens satisfies following conditions: 3.80≤f1/f≤5.00; f2≤0.00; and 1.55≤n3≤1.70, where f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; f2 denotes a focal length of the second lens; and n3 denotes a refractive index of the third lens. The present disclosure can achieve high optical performance while achieving ultra-thin, wide-angle lenses having a big aperture.