Six-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 and digital cameras, where the existing lens structures struggle to achieve both miniaturization and high imaging quality.
Innovation Solution
A six-piece camera optical lens design is proposed, comprising lenses made of plastic with specific refractive powers and curvature radii, optimized to achieve a short total optical length, low F-number, and effective aberration correction, ensuring ultra-thin and wide-angle capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the lens structure uses more lens elements (five-piece, six-piece, seven-piece) to improve imaging quality, then the imaging quality and aberration correction improve, but the total optical length increases and the lens becomes thicker
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive indices (nd1=1.5449, nd2=1.6713, nd3=1.5449, nd4=1.6510, nd5=1.5449, nd6=1.5449) and Abbe numbers (vd1=55.93, vd2=19.24, vd3=55.93, vd4=21.51, vd5=55.93, vd6=55.93) of each lens element, along with specific curvature radii and thickness ratios, to achieve optimal aberration correction while maintaining a compact total optical length suitable for ultra-thin devices
Solution Approach 2:
The patent employs composite materials by combining plastic lens elements with different optical properties (different refractive indices and Abbe numbers) to correct various types of aberrations. The use of plastic materials with specific optical characteristics allows for effective chromatic aberration correction and spherical aberration control while maintaining a thin profile
2Length of stationary object
If the lens is miniaturized for handheld devices, then the device thickness decreases, but the aperture size and optical characteristics deteriorate
Solution Approach 1:
The patent applies dimensionality change by optimizing the axial thickness ratios of each lens element (d1/TTL=0.04-0.08, d2/TTL=0.08-0.15, d3/TTL=0.03-0.07, d4/TTL=0.05-0.10, d5/TTL=0.06-0.12, d6/TTL=0.04-0.09) to distribute the optical power efficiently along the optical axis, enabling a large aperture relative to the total optical length while maintaining an ultra-thin profile
3Adaptability or versatility
If the lens adopts a wide-angle design, then the field of view increases, but the optical characteristics and aberration control become more difficult
Solution Approach 1:
The patent applies local quality by assigning specific optical properties to each lens element positioned at different locations in the optical system. Each lens element has tailored curvature radii, thickness, and material properties (refractive index and Abbe number) to correct specific aberrations locally, enabling effective wide-angle performance with controlled distortion and aberrations
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 aberrations, maintaining miniaturization while enhancing imaging performance and aperture size.
Implementation Method 1
a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6... the second lens has a positive refractive power, and the third lens has a negative refractive power
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 having a positive refractive power, a third lens having a negative refractive power, a fourth lens, a fifth lens and a sixth lens. The camera optical lens satisfies following conditions: 3.00≤f1/f≤7.00 and 9.00≤R9/d9≤14.00, where f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; R9 denotes a curvature radius of an object-side surface of the fifth lens; and d9 denotes an on-axis thickness of the fifth lens. The camera optical lens can achieve a high imaging performance while obtaining a low TTL.