Zoom Optical System Aberration Correction via Variable Lens Spacing
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Solution Overview
Problem
Conventional zoom optical systems for cameras face challenges in achieving favorable optical performance while maintaining a small size, particularly in correcting aberrations such as spherical aberration, coma aberration, and curvature of field.
Innovation Solution
The zoom optical system comprises a first lens group with negative refractive power and a rear group with multiple lens groups, where the space between adjacent lens groups changes at zooming, satisfying specific conditional expressions to optimize the relation between the entire length and focal length of the system at different zoom ends, allowing for excellent correction of aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional zoom optical system configurations are used, then the system can achieve zoom functionality, but it is difficult to achieve favorable optical performance with a small size
Solution Approach 1:
The patent applies parameter changes by optimizing the conditional expressions relating the entire length TL and focal length f at different zoom ends (wide-angle end and telephoto end). By carefully controlling the ratios TLw/fw and TLt/ft within specific ranges, the patent achieves a balance between compact size and favorable optical performance, resolving the contradiction between small size and optical quality.
2Volume of moving object
If the entire length of the zoom optical system is reduced, then the size becomes smaller, but the correction of aberrations such as spherical aberration, coma aberration, and curvature of field becomes difficult
Solution Approach 1:
The patent uses parameter changes by establishing specific conditional expressions for the ratios of entire length to focal length at wide-angle (TLw/fw between 1.50-2.30) and telephoto (TLt/ft between 0.90-1.50) ends. These parameter constraints ensure that the optical system maintains adequate length for aberration correction while achieving compact overall size.
Solution Approach 2:
The patent applies dynamics by allowing the space between adjacent lens groups to change during zooming operations. This dynamic adjustment of inter-group spacing enables the system to maintain optimal optical performance across different focal lengths while keeping the overall length controlled, effectively managing aberrations throughout the zoom range.
3Adaptability or versatility
If the space between lens groups is made variable, then zooming functionality is achieved, but the structural complexity increases
Solution Approach 1:
The patent implements dynamics by designing a zoom optical system where the space between adjacent lens groups varies during zooming. This dynamic configuration allows the system to achieve different focal lengths and maintain favorable optical performance across the zoom range, balancing versatility with manageable structural complexity through careful design of the variable spacing mechanism.
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 enables the achievement of favorable optical performance with a small size by effectively correcting various aberrations across the zoom range, ensuring excellent imaging quality in both wide-angle and telephoto end states.
Implementation Method 1
a first lens group G1 having negative refractive power
Data Source
AI summary
A variable magnification optical system (ZL) comprises a first lens group (G1) having negative refractive power, and a rear group (GR) having at least one lens group, the distance between lens groups adjacent to each other changes when the magnification is changed, and the following conditional expression is satisfied. 0.90<TLt/ft<1.50 where TLt is the total length of the variable magnification optical system (ZL) in a telephoto end state, and ft is the focal distance of the variable magnification optical system (ZL) in the telephoto end state.