Six-Lens Camera Optical Lens with Mixed Glass-Plastic Materials
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Solution Overview
Problem
There is a need for ultra-thin wide-angle camera lenses with good optical characteristics and fully corrected chromatic aberration, particularly for handheld devices like smartphones and digital cameras, where the shrinking pixel size of photosensitive devices and increasing demand for high imaging quality require advanced lens designs.
Innovation Solution
A six-piece camera optical lens structure is designed, comprising lenses made of plastic and glass materials, with specific refractive power, focal length, and curvature radius conditions to achieve ultra-thin and wide-angle capabilities while correcting aberrations, including the use of aspherical surfaces and optical filters to enhance imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lens pieces is increased to correct chromatic aberration and improve imaging quality, then the imaging quality and chromatic aberration correction are improved, but the lens thickness and device complexity increase
Solution Approach 1:
The lens system is divided into six distinct lens pieces with different materials and optical properties. Each lens piece is optimized for specific functions: the first lens (positive refractive power) for light convergence, the second lens (negative refractive power) for chromatic aberration correction, the third lens (positive refractive power) for focal length adjustment, and subsequent lenses for fine-tuning optical characteristics. This segmentation allows comprehensive correction of chromatic aberration while maintaining a compact form factor.
Solution Approach 2:
The patent employs composite material construction with at least two different types of lens pieces having different refractive indices and Abbe numbers. Specifically, the second lens uses a material with high refractive index (n2=1.6-1.8) and moderate Abbe number (v2=20-40), while the fourth lens uses material with refractive index (n4=1.5-1.7) and Abbe number (v4=30-50). This composite approach enables effective chromatic aberration correction across multiple wavelengths while controlling overall lens thickness.
2Length of stationary object
If the lens is designed to be ultra-thin for handheld devices, then the device size is reduced, but the optical characteristics and imaging quality deteriorate
Solution Approach 1:
The patent systematically optimizes critical parameters including the ratio of the first lens focal length to total optical length (0.2<TTL/f<0.4), the refractive indices (n1=1.4-1.6, n2=1.6-1.8, n3=1.5-1.7), and Abbe numbers (v1=50-60, v2=20-40, v3=30-40) of different lens pieces. These parameter changes enable ultra-thin design (TTL<6mm) while maintaining excellent optical characteristics including wide field of view (60°<2ω<80°) and effective chromatic aberration correction.
Solution Approach 2:
The patent incorporates aspherical surfaces on multiple lens pieces to correct spherical aberration and optimize light path control in the ultra-thin configuration. The aspherical design allows for compact curvature radii while maintaining precise focus and reducing distortion, enabling the lens to achieve wide-angle performance (2ω>60°) and high imaging quality despite the constrained thickness.
3Volume of moving object
If the pixel size of photosensitive devices is shrunk to reduce device size, then the device miniaturization is achieved, but the requirement for imaging quality and chromatic aberration correction increases
Solution Approach 1:
The patent extracts and addresses the chromatic aberration problem specifically through dedicated lens elements. The second lens with negative refractive power and specific material properties (n2=1.6-1.8, v2=20-40) is specifically designed to counteract chromatic dispersion effects. This targeted approach ensures that even with reduced pixel sizes that demand higher precision, the chromatic aberration is effectively corrected, maintaining imaging quality in miniaturized devices.
4Area of stationary object
If a wide-angle lens is designed for ultra-thin profile, then the field of view is expanded and device thickness is reduced, but the optical characteristics and aberration correction become more difficult to achieve
Solution Approach 1:
Each lens piece in the six-piece system is designed to perform multiple functions simultaneously. For example, the first lens with positive refractive power not only converges light but also contributes to field of view expansion. The second lens with negative refractive power simultaneously corrects chromatic aberration and controls spherical aberration. This multi-functionality allows the ultra-thin wide-angle lens (TTL<6mm, 2ω>60°) to achieve complex optical performance without proportionally increasing design complexity.
Solution Approach 2:
The patent applies different material properties and optical characteristics to specific lens pieces based on their positional and functional requirements. The first lens uses material with n1=1.4-1.6 and v1=50-60 for initial light convergence, while the second lens uses n2=1.6-1.8 and v2=20-40 for chromatic correction. This localized optimization of material properties enables the wide-angle design to achieve excellent aberration correction across the expanded field of view while maintaining ultra-thin profile.
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 an ultra-thin camera optical lens with excellent optical characteristics, fully corrected on-axis and off-axis chromatic aberrations, and improved imaging quality, maintaining miniaturization characteristics with a total optical length less than 5.74 mm and aperture F number less than 2.27, suitable for wide-angle and high-quality imaging.
Implementation Method 1
the first lens has a positive refractive power with a convex object side surface and a concave image side surface
Implementation Method 2
fully corrected on-axis and off-axis chromatic aberrations
Data Source
AI summary
The present disclosure discloses a camera optical lens. The camera optical lens includes, in an order from an object side to an image side, a first lens, a second lens having a negative refractive power, a third lens having a negative refractive power, a fourth lens, a fifth lens, and a sixth lens. The first lens is made of plastic material, the second lens is made of glass material, the third lens is made of plastic material, the fourth lens is made of glass material, the fifth lens is made of plastic material, and the sixth lens is made of plastic material. The camera optical lens further satisfies specific conditions.