Six-Piece Camera Lens with Glass-Plastic Hybrid Elements
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 better imaging quality require more complex lens structures.
Innovation Solution
A six-piece camera optical lens design is proposed, comprising lenses made of glass and plastic materials, with specific refractive powers, focal lengths, and curvature radii optimized to achieve ultra-thin and wide-angle capabilities while correcting aberrations, including the use of an optical filter between the sixth lens and the image surface.
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 multiple independent lens elements (six pieces total) with specific refractive powers and material compositions. Each lens element is designed with particular curvature radii and thickness ratios to address specific optical aberrations, allowing the complex optical function to be segmented into manageable components that can be manufactured and assembled separately.
Solution Approach 2:
The patent employs composite material design by combining glass and plastic materials in specific lens elements. The first lens uses glass material while other lenses use plastic materials, creating a composite optical system that leverages the advantages of both materials (glass for precision and stability, plastic for molding flexibility and cost) to achieve superior imaging quality without proportionally increasing manufacturing complexity.
2Length of moving object
If the lens structure is made ultra-thin to meet handheld device requirements, then the device miniaturization is achieved, but the optical performance and aberration correction become more difficult
Solution Approach 1:
The patent applies parameter optimization by establishing specific mathematical relationships between lens parameters: the thickness ratio of each lens element (d1/TTL between 0.06-0.14, d2/TTL between 0.10-0.20, etc.), curvature radius ratios ((R1+R2)/(R1-R2) between -6.0 to -2.0), and refractive index ranges (1.50<n1<2.20, 1.30<n2<1.70). These constrained parameter ranges enable ultra-thin design while maintaining optical performance by ensuring each parameter stays within optimal bounds for aberration correction.
Solution Approach 2:
The patent transitions from conventional lens design to ultra-thin design by fundamentally changing the dimensional proportions. The total optical length is reduced to extreme proportions with each lens element's thickness carefully controlled as a ratio of total length (e.g., d1/TTL ≤ 0.14), creating a flattened, miniaturized optical path that maintains functionality despite reduced dimensions through optimized dimensional relationships.
3Volume of moving object
If the pixel size of photosensitive devices is reduced to enable device miniaturization, then the device size is reduced, but the imaging quality and light gathering capability deteriorate
Solution Approach 1:
The optical system is segmented into six distinct lens elements with alternating positive and negative refractive powers. This segmentation allows for sophisticated aberration correction that compensates for the reduced light gathering capability of smaller pixels, as each element contributes to optimizing the light path and image quality despite the miniaturized scale.
Solution Approach 2:
By using composite materials (glass and plastic) with different optical properties, the system maintains high imaging quality in miniaturized form. The material composition is optimized to maximize light transmission and minimize aberrations, compensating for the smaller pixel size and ensuring that image quality is not sacrificed during device miniaturization.
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 excellent optical characteristics, fully correcting on-axis and off-axis chromatic aberrations, maintaining miniaturization and enhancing imaging quality with a total optical length as short as possible, suitable for ultra-thin and wide-angle applications.
Implementation Method 1
an optical filter between the sixth lens and the image surface
Implementation Method 2
A six-piece camera optical lens design is proposed, comprising lenses made of glass and plastic materials, with specific refractive powers, focal lengths, and curvature radii optimized to achieve ultra-thin and wide-angle capabilities
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 positive refractive power, a third lens having a positive refractive power, a fourth lens, a fifth lens, and a sixth lens. The first lens is made of glass 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 plastic material. The camera optical lens further satisfies specific conditions.