Eight-Lens Optical Imaging Design With Aspherical Aberration Control
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Solution Overview
Problem
Existing optical imaging lenses for portable electronic devices face challenges in achieving ultra-thin and ultra-large image planes, large apertures, and high imaging quality while maintaining a compact size, as increasing the number of lenses often leads to increased size and complexity.
Innovation Solution
An optical imaging lens design comprising eight lenses with specific refractive powers, radii of curvature, and center thicknesses, along with aspherical surfaces, is optimized to satisfy conditions such as f×tan(Semi-FOV)>4.5 mm and −7.0<(R13+R15)/T78<−3.0, ensuring efficient light deflection and aberration control, allowing for a compact form factor while maintaining high imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lenses is increased to improve imaging quality, then imaging quality is improved, but the size of the lens increases
Solution Approach 1:
The patent employs aspherical surfaces on multiple lens elements (first, third, fourth, fifth, and sixth lenses have aspherical object-side surfaces). This curvature variation allows for better aberration control and improved imaging quality without requiring additional lens elements, thus avoiding increased lens size. The aspherical design enables more efficient light path management within a compact form factor.
Solution Approach 2:
The patent optimizes specific parameter relationships including the focal length ratio (0.5≤f/f7≤1.0), radius of curvature ratios (3.0≤f2/R3≤8.0, 2.0≤f1/R1≤5.0), and separation distances between lenses. These parameter optimizations allow the eight-lens system to achieve high imaging quality while maintaining a compact overall size, resolving the contradiction between quality and size.
2Manufacturing precision
If the number of lenses is increased to improve imaging quality, then imaging quality is improved, but the device complexity increases
Solution Approach 1:
By using aspherical surfaces strategically on five out of eight lenses, the patent achieves superior aberration correction and imaging quality. This approach is more efficient than simply adding more spherical lenses, as the aspherical design provides better optical performance per element, reducing the relative complexity burden of each lens in the system.
Solution Approach 2:
The patent establishes specific parameter ranges for focal lengths, radii of curvature, and separation distances that optimize the overall system performance. These parameter constraints guide the design process and ensure that the eight-lens system achieves high imaging quality without excessive complexity in individual element design.
3Length of moving object
If the lens is made ultra-thin to reduce size, then the thickness is reduced, but the imaging quality deteriorates
Solution Approach 1:
The aspherical surfaces on multiple lenses enable effective aberration control in a thin form factor. The varying curvature allows for compact lens design while maintaining the optical path length necessary for quality imaging, resolving the contradiction between thinness and imaging performance.
Solution Approach 2:
The patent optimizes the ratio of center thickness to separation distance (0.9≤CT2/T23≤1.5) and controls the overall thickness-to-focal-length ratio (TTL/f between 1.0 and 1.5). These parameter optimizations enable the lens to achieve ultra-thin profile while maintaining adequate optical path length for high-quality imaging.
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 ultra-thin and ultra-large image planes, large aperture, and good imaging quality, with improved manufacturability and reduced sensitivity to aberrations, making it suitable for portable electronic devices.
Implementation Method 1
an optical imaging lens, comprising, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens
Implementation Method 2
there is at least one aspherical lens surface from an object side surface of the first lens to an image side surface of the eighth lens
Data Source
AI summary
An optical imaging lens includes in order from an object side to an image side along an optical axis a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens. The first and seventh lens have a positive refractive power. The maximum semi-field of view Semi-FOV and a total effective focal length f of the optical imaging lens satisfy f×tan(Semi-FOV)>4.5 mm. A radius of curvature R13 of an object side surface of the seventh lens, a radius of curvature R15 of an object side surface of the eighth lens, and a separation distance T78 between the seventh lens and the eighth lens on the optical axis satisfy −7.0<(R13+R15)/T78<−3.0. A combined focal length f12 of the first and second lens and an effective focal length f3 of the third lens satisfy 2.0<f3/f12<6.0.