Compact Optical System with Variable Aperture and Focusing Groups
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Solution Overview
Problem
Current optical systems face challenges in achieving a small size with a wide angle of view and a small F-number while maintaining high resolution, which is increasingly demanded in digital camera applications.
Innovation Solution
The optical system is designed with a configuration that includes multiple lens components, a variable aperture stop, and at least one focusing group that moves during focusing, satisfying specific conditional expressions to optimize lens placement, refractive power distribution, and curvature radii, ensuring a compact design with a wide angle and low F-number while maintaining high resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the optical system is designed with a wide angle of view and small F-number, then the light gathering capability and field of view are improved, but the optical system size and complexity increase
Solution Approach 1:
The optical system is divided into multiple lens groups (first lens group with positive refractive power, second lens group with negative refractive power, third lens group with positive refractive power) separated by specific air gaps. This segmentation allows each group to contribute differently to light gathering while maintaining manageable complexity through modular design
Solution Approach 2:
Different regions of the optical system are assigned different refractive powers and focal lengths. The first lens group has positive refractive power for light convergence, the second has negative refractive power for divergence control, and the third has positive refractive power for final focusing. This local differentiation optimizes light gathering in each region while maintaining overall system feasibility
2Length of stationary object
If the optical system is designed to be compact, then the device size is reduced, but the resolution and imaging quality may deteriorate
Solution Approach 1:
The optical system employs a nested arrangement where lens groups are positioned closely together with minimized air gaps. The first, second, and third lens groups are arranged in sequence with compact spacing, allowing the system to achieve a short overall length while maintaining the necessary optical path for high-resolution imaging
Solution Approach 2:
The patent specifies precise parameter ranges including conditional expressions for focal lengths (f1, f2, f3), refractive powers, and air gap distances. By optimizing these parameters within defined ranges, the system achieves compact dimensions without compromising imaging quality, as the parameters are tuned to maintain proper light convergence and focus
3Manufacturing precision
If multiple lens components are added to improve resolution, then the imaging quality is enhanced, but the number of parts and system complexity increase
Solution Approach 1:
The patent combines multiple lens elements into three integrated lens groups, where each group functions as a unified optical unit. This merging approach achieves high resolution through the collective effect of the groups while reducing the number of individual adjustable components compared to having separate lenses for each function
Solution Approach 2:
Each lens group serves multiple functions: the first lens group contributes to light convergence and initial focusing, the second lens group controls divergence and expands the angle of view, and the third lens group provides final focusing. This multi-functionality allows three components to accomplish what would otherwise require more specialized elements
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
This configuration allows for a compact optical system with a wide angle of view and small F-number, effectively addressing the demand for high-resolution imaging in digital cameras by optimizing lens placement and refractive power distribution.
Implementation Method 1
an optical system includes a plurality of lens components
Implementation Method 2
an aperture stop that has a variable opening diameter and that determines an F-number of the optical system
Data Source
AI summary
An optical system includes a plurality of lens components in a case where one lens component is one single lens or one cemented lens, in which an aperture stop that has a variable opening diameter and that determines an F-number of the optical system and at least one focusing group that moves during focusing are disposed in the optical system. The optical system satisfies a predetermined conditional expression.