Six-Lens Optical Imaging Layout With Lower Tolerance Sensitivity
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Solution Overview
Problem
The application of aspherical surfaces to all lenses in camera modules for miniaturized camera modules leads to reduced performance and productivity due to manufacturing and assembly tolerances.
Innovation Solution
An optical imaging system is designed with a combination of spherical and aspherical surfaces, where one lens has a spherical object-side surface and another has an aspherical image-side surface, and the lens with the highest refractive index is positioned in front, satisfying specific focal length and refractive power conditions to minimize the impact of manufacturing and assembly tolerances while maintaining high resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If aspherical surfaces are applied to all lenses in camera modules, then high resolution and miniaturization are achieved, but manufacturing precision and productivity deteriorate due to manufacturing and assembly tolerances
Solution Approach 1:
The patent applies different surface shapes (spherical or aspherical) to different lenses based on their specific optical functions and positions in the imaging system. This local differentiation allows each lens to be optimized for its role while reducing overall sensitivity to manufacturing tolerances, resolving the contradiction between achieving high resolution and maintaining manufacturing precision.
2Volume of moving object
If aspherical surfaces are applied to all lenses, then miniaturization is achieved, but productivity deteriorates due to manufacturing and assembly tolerances
Solution Approach 1:
By selectively applying aspherical surfaces only to specific lenses rather than all lenses, the patent maintains the miniaturization benefits while reducing the complexity and cost of manufacturing. This approach improves productivity by simplifying the manufacturing process and reducing the impact of assembly tolerances.
3Measurement precision
If aspherical surfaces are applied to all lenses, then high resolution is achieved, but device complexity increases due to manufacturing and assembly tolerances
Solution Approach 1:
The patent implements a hybrid approach where only specific lenses have aspherical surfaces while others have spherical surfaces. This reduces device complexity by avoiding the need for complex manufacturing and assembly processes across all lenses, while still achieving high resolution through the strategic placement of aspherical surfaces where they provide the most benefit.
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 system achieves improved aberration correction, high resolution, and reduced sensitivity to manufacturing and assembly tolerances, enhancing productivity and performance.
Implementation Method 1
the lens of the first to sixth lenses that is closer to the object side than the one of the first to sixth lenses including the spherical object-side surface, may include a highest refractive index among the first to sixth lenses
Data Source
AI summary
An optical imaging system is described including first to sixth lenses sequentially disposed from an object side to an image side, and an image sensor configured to convert incident light reflected from a subject, having passed through the first to sixth lenses, into an electrical signal. One of the first to sixth lenses includes a spherical object-side surface and another of the first to sixth lenses includes corresponding aspherical object-side surfaces. The first to sixth lenses include corresponding aspherical image-side surfaces, and a lens of the first to sixth lenses that is closer to the object side than the one of the first to sixth lenses including the spherical object-side surface, has a highest refractive index among the first to sixth lenses.