Seven-Lens Camera Optical Design for Wide-Angle, Ultra-Thin Imaging
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Solution Overview
Problem
There is an urgent need for a miniaturized camera optical lens with excellent optical characteristics, wide-angle, large aperture, and ultra-thinness, particularly suitable for portable devices, to meet the increasing demand for high imaging quality in smart devices and digital cameras.
Innovation Solution
A camera optical lens design comprising seven lenses, with specific refractive powers and geometrical constraints, including glass and plastic materials, to achieve optimal optical performance and compactness, featuring a wide angle, large aperture, and ultra-thinness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-piece lens structure is used to improve imaging quality, then optical performance is improved, but device complexity increases
Solution Approach 1:
The optical lens system is divided into seven separate lens elements with alternating positive and negative refractive powers, arranged in sequence from object side to image side. This segmentation allows each lens element to contribute specifically to correcting different types of optical aberrations, thereby improving overall imaging quality while maintaining manageable complexity through functional specialization
Solution Approach 2:
Each lens element is designed with specific local optical properties: the first and second lenses have negative refractive power for specific aberration correction, while the third, fourth, and seventh lenses have positive refractive power for focusing and image formation. The fifth and sixth lenses form a cemented structure with specific Abbe number differences to correct chromatic aberration. This local optimization of optical properties throughout the system achieves superior imaging quality
2Reliability
If lens elements are added to correct aberrations, then optical performance is improved, but total track length increases
Solution Approach 1:
The fifth and sixth lenses are cemented together to form an integrated lens unit, where the fifth lens with positive refractive power and the sixth lens with negative refractive power are bonded in sequence. This nesting approach reduces the overall air gaps and structural complexity compared to fully separate elements, helping to control the total track length while maintaining the aberration correction benefits of multiple elements
Solution Approach 2:
The patent implements specific parameter constraints including the ratio of focal lengths f5/f6 between -6.50 and -2.30, the distance d6/TTL between 0.035 and 0.055, and curvature radius ratios R7/R8 between -3.50 and -1.80. These parameter optimizations enable compact lens element spacing and efficient light path management, achieving excellent optical characteristics with a reduced total track length suitable for portable devices
3Reliability
If aperture is increased to improve light gathering, then imaging quality is improved, but lens diameter and size increase
Solution Approach 1:
The patent employs diverse lens materials with different refractive indices and Abbe numbers across the seven lens elements. Specifically, the fifth and sixth lenses are designed with an Abbe number difference v5-v6 between 35.00 and 70.00, creating a cemented achromatic doublet structure. This composite material approach enables effective chromatic aberration correction, allowing the use of larger effective apertures for improved light gathering without proportionally increasing the physical lens diameter, thus enhancing imaging quality in compact form
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 lens design provides excellent optical characteristics, supporting wide-angle and large aperture with ultra-thinness, suitable for cell phone cameras, web cameras, and in-vehicle lenses, enhancing imaging quality and reducing production costs.
Implementation Method 1
a first lens L1 with a negative refractive power, a second lens L2 with a negative refractive power, a third lens L3 with a positive refractive power, a fourth lens L4 with a positive refractive power, a fifth lens L5 with a positive refractive power, a sixth lens L6 with a negative refractive power, and a seventh lens L7 with a positive refractive power
Data Source
AI summary
A camera optical lens is provided, which includes seven lenses in sequence 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 the following conditions: −6.50≤f5/f6≤−2.30, 0.035≤d6/TTL≤0.055, and −3.50≤R7/R8≤−1.80. f5 represents a focal length of the fifth lens, f6 represents a focal length of the sixth lens, d6 represents an on-axis distance between the third lens and the fourth lens, TTL represents a total track length of the camera optical lens, R7 represents a central curvature radius of an object-side surface of the fourth lens, and R8 represents a central curvature radius of an image-side surface of the fourth lens.