Optical Lens Assembly Balancing Wide Angle and Compact Module Length
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Solution Overview
Problem
Existing lens module designs for 3D sensing technologies face challenges in achieving a large optical aperture, wide angle of view, and miniaturization while maintaining high image quality, often resulting in distortion and reduced illumination.
Innovation Solution
An optical lens assembly comprising five lenses with specific refractive powers and configurations, including a first lens with negative power, a second lens with positive power, a third lens with negative power, a fourth lens with positive power, and a fifth lens with positive power, optimized by conditions such as 1.27(mm)<f5*R10/SL<3.68(mm) and 1.18<IMH/EPD<2.03, to correct aberrations and balance refractive power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the lens module is designed for super large aperture and large angle of view, then the optical performance is improved, but the length of the lens module increases and distortion occurs
Solution Approach 1:
The lens module is divided into five separate lens elements with alternating positive and negative refractive powers. This segmentation allows each lens to contribute differently to the overall optical function, enabling large aperture and wide angle of view while controlling the total length through optimized individual element designs and spacing.
Solution Approach 2:
The patent applies specific parameter constraints including the ratio of focal length to lens module length (0.15 < f/SL < 0.35), curvature radii relationships (R1/(CT1+T12) between -5 and -15), and spacing ratios (0.25 < (T23+T34)/(f5*T45) < 0.75). These parameter optimizations enable achieving large aperture while maintaining compact length by precisely controlling optical path geometry.
2Illumination intensity
If the lens module is designed for super large aperture and large angle of view, then the optical performance is improved, but image distortion increases
Solution Approach 1:
By dividing the optical system into five lens elements with alternating positive and negative powers, the patent can correct various aberrations including distortion through the combined effect of individual elements. The negative power lenses (first and third) help counteract the distortion introduced by positive power lenses, maintaining image quality despite large aperture design.
Solution Approach 2:
The patent implements multiple parameter constraints to control distortion and maintain image quality: focal length ratio (0.15 < f/SL < 0.35), curvature radius relationships (R1/(CT1+T12) between -5 and -15), spacing ratios (0.25 < (T23+T34)/(f5*T45) < 0.75), and thickness ratios (0.6 < (CT2+CT4)/CT3 < 1.5). These optimized parameters ensure minimal distortion while achieving large aperture.
3Length of stationary object
If the lens module length is reduced, then miniaturization is achieved, but the view angle and relative illumination are sacrificed
Solution Approach 1:
The patent employs alternating positive and negative refractive powers in the five lens elements, creating a dynamic optical path that efficiently bends light rays. This alternating configuration allows the system to achieve wide angle of view and maintain relative illumination within compact length by optimizing the light path geometry rather than simply scaling up the entire system.
Solution Approach 2:
The patent optimizes multiple parameters simultaneously: focal length to length ratio (0.15 < f/SL < 0.35) for compactness, curvature radii (R1/(CT1+T12) between -5 and -15) for light gathering, and spacing ratios (0.25 < (T23+T34)/(f5*T45) < 0.75) for angle of view. These coordinated parameter changes achieve miniaturization without sacrificing relative illumination or view angle.
4Length of stationary object
If the lens module length is reduced, then miniaturization is achieved, but the view angle is reduced
Solution Approach 1:
The alternating positive and negative refractive power configuration creates a dynamic light path that maximizes the angle of view for a given length. The negative power lenses diverge light rays to expand the field of view, while positive power lenses converge them onto the image sensor, achieving wide angle coverage within a compact form factor.
Solution Approach 2:
The patent optimizes the focal length to length ratio (0.15 < f/SL < 0.35) to achieve compact size while maintaining wide angle of view. The curvature radius relationships (R1/(CT1+T12) between -5 and -15) and spacing ratios (0.25 < (T23+T34)/(f5*T45) < 0.75) are tuned to maximize the field of view angle without increasing the overall module length.
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 solution achieves a large angle of view, high relative illuminance, and miniaturization of the lens module by optimizing spatial and refractive power configurations, improving image quality and reducing the height of the lens module.
Implementation Method 1
a first lens with negative refractive power; a second lens with positive refractive power... a third lens with negative refractive power... a fourth lens with positive refractive power; and a fifth lens with positive refractive power
Data Source
AI summary
An optical lens assembly includes a stop, and includes, in order from the object side to the image side: a first lens, a second lens, a third lens, a fourth lens, and fifth lens, wherein a focal length of the fifth lens is f5, a radius of curvature of an image-side surface of the fifth lens is R10, a distance between the stop to the image plane on the optical axis is SL, satisfying the relation:1.27<f5*R10/SL<3.68.