Magnification-Variable Optical System Aberration Correction
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Solution Overview
Problem
Conventional magnification-variable optical systems face challenges in achieving improved optical performance, particularly in terms of size reduction and wide-angle capabilities while maintaining effective aberration correction and aperture performance.
Innovation Solution
A magnification-variable optical system comprising a first lens group with negative refractive power and a rear group, where the distance between lens groups changes at magnification adjustment, and specific refractive index and Abbe number conditions are met to optimize lens configuration and aberration correction, allowing for a compact, wide-angle design with reduced lens count and improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the lens count is reduced to achieve a compact design, then the device complexity is reduced, but the optical performance and aberration correction capability deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive indices (nL1, nL2) and Abbe numbers (ν1n) of lens materials, along with their relative positions. This allows achieving effective aberration correction with fewer lenses by optimizing the optical parameters of each lens element rather than simply increasing lens count.
Solution Approach 2:
The patent uses composite material principles by combining lens elements with different refractive indices and Abbe numbers in a specific configuration. The first lens group uses materials with carefully selected optical parameters (nL1 > nL2 and specific ratio constraints) to create a composite optical system that achieves superior aberration correction with reduced lens count.
2Area of stationary object
If the optical system is designed for wide-angle capability, then the field of view is increased, but the optical performance and aberration correction become more difficult to maintain
Solution Approach 1:
The patent addresses wide-angle aberration correction by changing the optical parameters of lens materials. The specific constraints on Abbe numbers (ν1n > 80.00) and refractive index ratios (1.05 < nL2/nL1) are designed to control dispersion and refraction characteristics, enabling effective aberration correction across wide field of view angles.
3Adaptability or versatility
If the distance between lens groups is made variable for magnification change, then the magnification ratio is improved, but the device complexity increases
Solution Approach 1:
The patent applies dynamics by making the distance between the first lens group and the rear group variable. This dynamic adjustment of inter-group distance enables continuous magnification change while maintaining compact overall structure. The movable configuration allows the optical system to adapt between wide-angle and telescopic states without requiring complex additional mechanisms.
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 a compact, wide-angle design with enhanced aberration correction and reduced lens count, supporting both wide-angle and telescopic states with improved optical performance and aperture efficiency.
Implementation Method 1
a first lens group G1 having negative refractive power
Implementation Method 2
nL1: refractive index of a medium of a lens at a d line, the lens being closest to an object side in the first lens group, and nL2: refractive index of a medium of a lens at a d line, the lens being second closest to the object side in the first lens group
Data Source
AI summary
A magnification-variable optical system having a small size, a wide angle of view, and high optical performance, an optical apparatus including the magnification-variable optical system, and a method for manufacturing the magnification-variable optical system are provided.A magnification-variable optical system ZL used for an optical apparatus such as a camera 1 includes a first lens group G1 having a negative refractive power and including at least two lenses, and a rear group GR including at least one lens group disposed on an image side of the first lens group G1, and is configured so that a distance between lens groups adjacent to each other changes at magnification change and a condition expressed by predetermined condition expressions is satisfied.