Seven-Lens Camera Optical Lens 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 aberration, particularly for handheld devices and imaging systems, where the increasing demand for miniature lenses with better imaging quality is not adequately met by existing multi-piece lens structures.
Innovation Solution
A seven-piece camera optical lens design is proposed, with specific refractive power and curvature radius conditions for each lens element, including a combination of plastic and glass materials, to achieve ultra-thin and wide-angle capabilities while correcting aberrations, as detailed in the provided Embodiments 1, 2, and 3.
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 structure, but the imaging quality and aberration correction are insufficient
Solution Approach 1:
The lens system is divided into seven separate lens elements with specific refractive power configurations (++-+---, ++-+--+, or ++-+---). Each lens element is designed with specific curvature radius ratios and refractive index ranges to independently correct different types of aberrations, achieving comprehensive optical correction that cannot be accomplished with fewer elements.
Solution Approach 2:
The patent specifies different refractive index ranges for different lens elements (e.g., first lens: 1.45-1.70, second lens: 1.50-1.80, third lens: 1.60-2.00). This composite material approach allows each element to contribute differently to the overall optical performance, enabling better aberration correction while maintaining a compact form factor.
2Length of stationary object
If the lens is designed to be ultra-thin with short total optical length, then the device dimensions are reduced, but the aperture and optical performance may be compromised
Solution Approach 1:
The patent establishes specific parameter ranges to achieve the ultra-thin design: total optical length TTL satisfies 0.8mm < TTL ≤ 2.0mm, and the ratio of aperture diameter to TTL satisfies 0.15 < aperture diameter/TTL ≤ 0.30. Each lens element's curvature radius and thickness are precisely controlled (e.g., first lens curvature radius ratio (R1+R2)/(R1-R2) satisfies -5.0 ≤ ratio ≤ -1.0) to optimize the balance between compactness and optical performance.
Solution Approach 2:
The patent transitions from traditional multi-element lens designs to a seven-element configuration that optimizes the distribution of optical power across multiple surfaces. By carefully controlling the curvature radii and thicknesses of each element, the design achieves ultra-thin profile while maintaining adequate aperture through optimized light path geometry rather than relying on single-element large aperture designs.
3Adaptability or versatility
If wide-angle capability is increased, then the field of view is expanded, but the aberration correction becomes more difficult
Solution Approach 1:
The seven-lens configuration allows different elements to specialize in correcting different aberration types. The positive and negative refractive power elements are strategically positioned to correct spherical aberration, coma, astigmatism, and field curvature that become more pronounced in wide-angle designs. This segmented approach to aberration correction enables effective control of off-axis performance.
Solution Approach 2:
Each lens element is designed with specific local optical properties: the first lens has positive refractive power with controlled curvature to handle central field rays, while subsequent elements with alternating positive and negative powers address specific off-axis aberrations. The third lens specifically targets lateral color correction with its higher refractive index range (1.60-2.00), providing localized correction where needed most in the wide-angle field.
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 on-axis and off-axis aberrations, maintaining miniaturization characteristics with a short total optical length and large aperture, enhancing imaging performance.
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 an object side to an image side along an optical axis
Data Source
AI summary
The present disclosure relates to the technical field of optical lens and discloses a camera optical lens. The camera optical lens includes, 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 satisfies following conditions: 1.51≤f1/f≤2.50, 1.70≤n3≤2.20, −2.00≤f3/f4≤2.00, −10.00≤(R13+R14)/(R13−R14)≤10.00 and 1.70≤n6≤2.20, where f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; f3 denotes a focal length of the third lens; f4 denotes a focal length of the fourth lens; n3 denotes a refractive index of the third lens; n7 denotes a refractive index of the seventh lens; R13 denotes a curvature radius of an object-side surface of the seventh lens; and R14 denotes a curvature radius of an image-side surface of the seventh lens.