7-Lens Camera Optical Lens for Ultra-Thin Wide-Angle Imaging
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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 for handheld devices, as existing lenses struggle to achieve high imaging quality due to limitations in refractive power and chromatic aberration correction.
Innovation Solution
A 7-lens camera optical lens design is proposed, with specific materials and refractive indices for each lens, along with precise curvature radii and thicknesses, to achieve a total optical length of less than 6.85 mm, facilitating ultra-thin and wide-angle capabilities while correcting 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 manufactured with simpler processes, but the imaging quality and chromatic aberration correction are insufficient
Solution Approach 1:
The lens system is divided into seven separate lens elements with specific refractive powers and dispersion characteristics. Each lens element (first through seventh lenses) is independently designed with specific curvature radii, thicknesses, and material properties to collectively achieve superior chromatic aberration correction and imaging quality that cannot be obtained with fewer elements.
Solution Approach 2:
The patent employs multiple lens materials with different refractive indices and Abbe numbers (dispersion characteristics). Specifically, the first lens has refractive index 1.69-2.20 and Abbe number 20-50, the second lens has refractive index 1.45-1.70 and Abbe number 30-60, and subsequent lenses use various materials selected to balance chromatic aberration correction across the spectrum, demonstrating composite material principles.
2Length of moving object
If the lens total optical length is reduced to achieve ultra-thin design, then the device can be miniaturized, but the field of view and imaging quality may be compromised
Solution Approach 1:
The patent achieves ultra-thin design by optimizing multiple parameters simultaneously: the total optical length is controlled at 6.85mm or less, while the focal length is maintained at 4.0mm or more to ensure adequate field of view. The ratio relationships between various lens parameters (curvature radii, thicknesses, spacing) are carefully adjusted to maintain optical performance despite the reduced overall length.
Solution Approach 2:
The lens design incorporates aspherical surfaces on multiple lens elements (first, second, third, fourth, fifth, sixth, and seventh lenses may have aspherical object-side or image-side surfaces). These aspherical surfaces dynamically adapt the light paths to achieve both compact form factor and wide field of view with corrected aberrations, allowing the system to overcome the typical trade-off between size and performance.
3Adaptability or versatility
If the focal length is increased to achieve wide-angle capability, then the field of view expands, but the total optical length increases making the lens less suitable for ultra-thin devices
Solution Approach 1:
The patent achieves the wide-angle capability with compact size by carefully controlling the focal length to be 4.0mm or more (for adequate field of view) while simultaneously limiting the total optical length to 6.85mm or less. This is accomplished through optimized distribution of refractive power across the seven lens elements and precise control of inter-lens spacing, demonstrating parameter optimization to resolve the contradiction.
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, including full correction of on-axis and off-axis chromatic aberrations, maintaining miniaturization and enhancing imaging quality with a wide field of view.
Implementation Method 1
a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7, from an object side to an image side
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 made of a glass material; a second lens made of a plastic material; a third lens made of a plastic material; a fourth lens made of a plastic material; a fifth lens made of a glass material; a sixth lens made of a plastic material; and a seventh lens made of a plastic material. The camera optical lens satisfies following conditions: 1.51≤f1/f≤2.50; 1.69≤n1≤2.20; 0.60≤f3/f4≤2.00; −10.00≤(R13+R–)/(R13−R14)≤10.00; and 1.70≤n5≤2.20. The camera optical lens can achieve a high imaging performance while obtaining a low TTL.