Six-element Camera Lens with Mixed Plastic-Glass 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 more complex lens structures.
Innovation Solution
A six-piece camera optical lens design is proposed, with specific refractive power and curvature radius conditions for each lens element, made of different materials (plastic and glass), optimizing the focal lengths and thicknesses to achieve ultra-thin and wide-angle capabilities while correcting aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the lens structure is increased from three-piece or four-piece to five-piece, six-piece or seven-piece, then the imaging quality and chromatic aberration correction are improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The lens system is divided into six distinct lens elements with specific refractive powers and material compositions. Each lens element (first through sixth lenses) is independently designed with specific curvature radii and thickness ratios, allowing precise control of optical paths and aberration correction while maintaining manageable manufacturing complexity through modular design
Solution Approach 2:
The patent employs composite material selection where different lens elements are made from materials with different Abbe numbers (dispersion characteristics). Specifically, lenses are constructed using materials with varying refractive indices and Abbe numbers to correct chromatic aberration, combining low-dispersion and high-dispersion materials in a multi-element configuration to achieve superior color correction
2Length of moving object
If the lens is designed to be ultra-thin for handheld devices, then the device size is reduced, but the optical performance and aberration correction become more difficult to achieve
Solution Approach 1:
The patent implements ultra-thin design by strictly controlling the thickness parameters of each lens element. The first lens has a thickness-to-focal-length ratio of 0.05<d1/f1<0.30, the second lens has 0.03<d2/|f2|<0.20, and subsequent lenses have similarly constrained thickness ratios. These parameter optimizations enable ultra-thin overall lens construction while maintaining adequate optical power and aberration correction capabilities
Solution Approach 2:
The patent compensates for the reduced thickness in the axial dimension by optimizing other design dimensions including curvature radii, air gaps between elements, and lateral dimensions. The system uses specific curvature radius ratios (e.g., R1/R2, R3/R4) and inter-element spacing to achieve the required optical power and aberration correction in a compressed axial profile, effectively trading off dimensional constraints
3Manufacturing precision
If the focal length of the first lens is optimized with specific ratio to total focal length, then the chromatic aberration is corrected, but the design constraints and manufacturing precision requirements increase
Solution Approach 1:
The patent corrects chromatic aberration by optimizing the focal length ratios of individual lenses to the total system focal length. The first lens satisfies 0.5<f1/f<5, the second lens satisfies -30<f2/f<-2, and subsequent lenses have similarly constrained focal length ratios. These parameter optimizations distribute the optical power and dispersion management across multiple elements with controlled focal length relationships, achieving comprehensive chromatic aberration correction
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 and fully corrected on-axis and off-axis chromatic aberrations, maintaining miniaturization and enhancing imaging quality.
Implementation Method 1
the first lens L1 has a positive refractive power with a convex object side surface relative to the proximal axis and a concave image side surface relative to the proximal axis. The second lens L2 has a negative refractive power with a convex object side surface relative to the proximal axis and a concave image side surface relative to the proximal axis
Data Source
AI summary
The present disclosure discloses a camera optical lens, including, in an order from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens is made of plastic material, the second lens is made of plastic material, the third lens is made of glass material, the fourth lens is made of plastic material, the fifth lens is made of plastic material, and the sixth lens is made of glass material. The camera optical lens further satisfies specific conditions.