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, where the shrinking pixel size of photosensitive devices and increasing demand for better imaging quality require more complex lens structures.
Innovation Solution
A 7-piece camera optical lens design is proposed, with specific materials and refractive power conditions for each lens element, including plastic and glass lenses, to achieve ultra-thin and wide-angle capabilities while minimizing chromatic aberration, featuring a focal length and refractive power distribution that balances aberrations and enhances 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 and chromatic aberration correction are insufficient
Solution Approach 1:
The lens system is divided into 7 separate lens elements with specific configurations (first through seventh lenses), allowing each element to contribute to correcting different types of aberrations. This segmentation enables sophisticated chromatic aberration correction and improved imaging quality that cannot be achieved with fewer elements.
Solution Approach 2:
The patent employs composite material design by combining lenses made of different materials (glass and plastic) with specific refractive indices and Abbe numbers. For example, the third lens uses glass material with high refractive power, while other lenses use plastic materials, creating a composite optical system that balances aberration correction with manufacturing feasibility.
2Manufacturing precision
If more lens elements are added to improve imaging quality, then the chromatic aberration correction improves, but the total optical length and device thickness increase
Solution Approach 1:
The patent utilizes parameter optimization by precisely controlling the refractive indices, Abbe numbers, and focal lengths of each lens element. Specific parameter ranges are defined (e.g., refractive power ratios, curvature radii relationships) to achieve chromatic aberration correction while keeping the total optical length within acceptable limits for ultra-thin devices.
Solution Approach 2:
Different regions of the optical system are assigned different functional qualities - the third lens specifically addresses chromatic aberration with high refractive power glass material, while other lenses focus on spherical aberration and field curvature correction. This localized optimization allows each element to contribute efficiently without requiring excessive total length.
3Volume of moving object
If the pixel size of photosensitive devices is reduced, then the device miniaturization is achieved, but the imaging quality and chromatic aberration become more difficult to control
Solution Approach 1:
The 7-element lens structure segments the optical correction functions across multiple elements, with each lens contributing to specific aberration corrections. This segmentation becomes increasingly important as pixel sizes shrink, as it allows precise control of light paths to maintain image quality despite reduced sensor dimensions.
Solution Approach 2:
The combination of glass and plastic lens materials with specifically selected refractive indices and dispersion properties enables effective chromatic aberration correction that is critical for maintaining image quality on smaller pixels. The composite material approach allows tuning of optical properties to match the reduced pixel pitch while preserving imaging performance.
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 high-performance imaging with reduced sensitivity and corrected chromatic aberrations, maintaining miniaturization characteristics and improving image quality across the field, suitable for ultra-thin and wide-angle applications.
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 arranged from the object side to the image side
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.