7-Element Camera 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, particularly for handheld devices like smartphones, where the shrinking pixel size of photosensitive devices and increasing demands for better imaging quality require more complex lens structures.
Innovation Solution
A 7-piece camera optical lens design is proposed, with specific focal lengths, refractive powers, and curvature radii for each lens element, optimized to achieve ultra-thin and wide-angle performance while minimizing chromatic aberration, using a combination of plastic and glass materials and carefully controlled optical lengths to ensure high imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a three-piece or four-piece lens structure is used, then the device complexity is reduced, but the imaging quality deteriorates due to shrinking pixel size and increasing demands
Solution Approach 1:
The lens is divided into seven separate lens elements (first through seventh lenses) with specific optical powers and focal lengths. This segmentation allows each element to contribute to correcting different types of optical aberrations, thereby achieving high imaging quality that cannot be obtained with simpler three-piece or four-piece structures.
2Manufacturing precision
If more lens elements are added to improve imaging quality, then the imaging quality improves, but the total optical length increases and the lens becomes less ultra-thin
Solution Approach 1:
The patent specifies precise parameter ranges for each lens element including focal lengths (e.g., -4.535mm for first lens, 13.130mm for third lens), refractive indices (e.g., 1.6355 for first lens), and curvature radii. These optimized parameters enable the seven-element design to achieve excellent chromatic aberration correction while maintaining a compact total optical length suitable for ultra-thin applications.
3Manufacturing precision
If a seven-piece lens structure is used, then chromatic aberration is fully corrected, but the device complexity increases
Solution Approach 1:
Different lens elements are assigned specific optical powers (positive or negative) and material properties to address particular aberration issues. For example, the first lens has negative optical power with specific curvature radii to correct certain aberrations, while the third lens has positive optical power to correct others. This localized optimization of each element's properties enables comprehensive chromatic aberration correction across the seven-element 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 7-piece lens design achieves excellent optical characteristics, including full correction of on-axis and off-axis chromatic aberrations, maintaining miniaturization and enhancing imaging quality with a short total optical length, suitable for high-performance camera applications in handheld devices.
Implementation Method 1
the first lens L1 has a negative optical power, an object side surface which is a convex surface relative to a proximal axis, and an image side surface which is a concave surface relative to the proximal axis
Data Source
AI summary
The present disclosure discloses a camera optical lens. The 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, a sixth lens and a seventh lens. The camera optical lens further satisfies specific conditions.