7-Element Camera Lens Design 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 demands for better imaging quality require more complex lens structures.
Innovation Solution
A 7-piece camera optical lens design is proposed, with specific constraints on the focal lengths, refractive powers, and curvature radii of 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 an optical filter to correct aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a three-piece or four-piece lens structure is used, then the device complexity is reduced, but the imaging quality and chromatic aberration correction are insufficient
Solution Approach 1:
The lens system is divided into 7 separate lens elements with specific optical powers and material properties. Each lens element (first through seventh lenses) is independently designed with specific curvature radii, thicknesses, and refractive indices to collectively achieve superior chromatic aberration correction and imaging quality that cannot be obtained with fewer elements.
2Length of moving object
If the lens is made ultra-thin, then the length of the lens is reduced, but the optical characteristics and chromatic aberration correction become difficult to maintain
Solution Approach 1:
The patent employs precise control of multiple optical parameters including curvature radii (R1 through R14), thicknesses (d1 through d7), and refractive indices (n1 through n7) of each lens element. Specific mathematical relationships are established between these parameters, such as the ratio of focal lengths (f1/f between -10 and -3.1) and curvature radius relationships, to achieve ultra-thin design while maintaining excellent optical performance and chromatic aberration correction.
3Adaptability or versatility
If the focal length is reduced for wide-angle performance, then the field of view is expanded, but the chromatic aberration increases
Solution Approach 1:
The patent uses a combination of different optical materials with varying refractive indices and dispersion properties for the 7 lens elements. This composite material approach allows the system to achieve wide-angle performance while correcting chromatic aberration through the complementary optical properties of different materials arranged in a specific sequence.
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 short total optical length, suitable for high-performance camera lenses in handheld devices.
Implementation Method 1
an optical filter arranged between the seventh lens and the image surface
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 first lens is made of plastic material, the second lens is made of glass 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, the sixth lens is made of plastic material, and the seventh lens is made of plastic material. The camera optical lens further satisfies specific conditions.