Six-element Camera Lens for Chromatic Aberration Correction
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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 better imaging quality require more complex lens structures.
Innovation Solution
A six-piece camera optical lens design is proposed, comprising lenses made of plastic and glass materials, with specific refractive indices and focal lengths, and carefully optimized curvature radii and thicknesses to achieve ultra-thin and wide-angle capabilities while correcting aberrations, including spherical and chromatic aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a three-piece or four-piece lens structure is used, then the lens can be simpler and easier to manufacture, but the imaging quality and chromatic aberration correction are insufficient
Solution Approach 1:
The lens system is divided into six separate lens elements with different materials and optical properties. Each lens element (first through sixth lenses) has specific refractive indices and Abbe numbers that are optimized to correct chromatic aberrations. The segmentation allows independent optimization of each element's contribution to overall imaging quality and aberration correction.
Solution Approach 2:
The patent employs composite material design by combining plastic lenses (first through fourth lenses) with glass lenses (fifth and sixth lenses). The plastic lenses have lower refractive indices (1.5-1.7) while the glass lenses have higher refractive indices (1.7-2.0) and higher Abbe numbers (50-70). This composite approach enables effective chromatic aberration correction by balancing the dispersive properties of different materials across the lens system.
2Length of moving object
If the lens is made ultra-thin to meet handheld device requirements, then the device can be more compact, but the optical characteristics and aberration correction may deteriorate
Solution Approach 1:
The patent optimizes multiple parameters simultaneously to achieve ultra-thin design while maintaining optical performance. Key parameters include: controlling the ratio of each lens thickness to total optical length (d1/TTL, d2/TTL, etc. within specific ranges), optimizing focal length ratios (f1/f, f2/f, f3/f within specific ranges), and selecting materials with specific refractive indices and Abbe numbers. These parameter optimizations enable effective aberration correction within a compact form factor.
Solution Approach 2:
Each lens element is designed to perform multiple functions: the first lens provides primary focusing power, the second and third lenses correct spherical and chromatic aberrations, the fourth lens fine-tunes focal properties, and the fifth and sixth lenses (glass elements) provide additional chromatic correction. This multi-functionality allows the compact six-element design to achieve performance comparable to larger lens systems.
3Manufacturing precision
If the pixel size of photosensitive devices is shrunk to improve device integration, then more devices can fit in handheld form factors, but the requirement for imaging quality and chromatic aberration correction increases
Solution Approach 1:
The lens system is divided into six separate lens elements with different materials and optical properties. Each lens element (first through sixth lenses) has specific refractive indices and Abbe numbers that are optimized to correct chromatic aberrations. The segmentation allows independent optimization of each element's contribution to overall imaging quality and aberration correction.
Solution Approach 2:
The patent employs composite material design by combining plastic lenses (first through fourth lenses) with glass lenses (fifth and sixth lenses). The plastic lenses have lower refractive indices (1.5-1.7) while the glass lenses have higher refractive indices (1.7-2.0) and higher Abbe numbers (50-70). This composite approach enables effective chromatic aberration correction by balancing the dispersive properties of different materials across the lens system.
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 a camera optical lens with excellent optical characteristics, fully corrected chromatic aberrations, and a short total optical length, maintaining miniaturization characteristics and high imaging quality.
Implementation Method 1
a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6... the first lens L1 has positive refractive power, the second lens L2 has positive refractive power, the third lens L3 has negative refractive power
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, a third lens, a fourth lens, a fifth lens, and a sixth lens. The camera optical lens further satisfies specific conditions.