Optical System A Lens Aberration Correction
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Solution Overview
Problem
Conventional optical systems with high refractive index glass lenses struggle to sufficiently correct spherical aberration and curvature of field.
Innovation Solution
An optical system comprising multiple lens groups, where at least one lens group includes an A lens with a refractive index and Abbe number within specific ranges (nA−0.00250νA and nA−0.3375νA) to effectively correct spherical aberration and curvature of field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a lens made of high refractive index glass is used, then the lens can achieve compact size and good optical performance, but spherical aberration and curvature of field cannot be sufficiently corrected
Solution Approach 1:
The patent applies parameter changes by carefully selecting and controlling the refractive index and Abbe number of the glass material for the positive lens. By specifying that the glass satisfies 1.70 < n d − 0.00400ν d < 2.00 and −5.00 < n d − 0.37500ν d < 0.00, the invention optimizes the optical parameters to simultaneously achieve compact lens size and sufficient correction of spherical aberration and curvature of field.
Solution Approach 2:
The patent employs composite materials by using a positive lens made of glass with specifically controlled refractive index and Abbe number characteristics. This glass material acts as a composite optical medium that combines high refractive index for compactness with specific dispersion properties (Abbe number) to enable adequate aberration correction, resolving the contradiction between size and optical quality.
2Length of moving object
If a lens made of high refractive index glass is used, then the lens can achieve compact size, but spherical aberration and curvature of field cannot be sufficiently corrected
Solution Approach 1:
The patent applies parameter changes by carefully selecting and controlling the refractive index and Abbe number of the glass material for the positive lens. By specifying that the glass satisfies 1.70 < n d − 0.00400ν d < 2.00 and −5.00 < n d − 0.37500ν d < 0.00, the invention optimizes the optical parameters to simultaneously achieve compact lens size and sufficient correction of spherical aberration and curvature of field.
Solution Approach 2:
The patent employs composite materials by using a positive lens made of glass with specifically controlled refractive index and Abbe number characteristics. This glass material acts as a composite optical medium that combines high refractive index for compactness with specific dispersion properties (Abbe number) to enable adequate aberration correction, resolving the contradiction between size and optical quality.
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 optical system achieves excellent optical performance by ensuring precise correction of spherical aberration and curvature of field across various focal lengths, enhancing image quality.
Implementation Method 1
at least one of the plurality of lens groups has an A lens that satisfies at least one of the following conditional expressions (1) and (2): 1.70＜nA−0.00400νA＜2.00 and −5.00＜nA−0.37500νA＜0.00 where nA denotes a refractive index of the A lens at d-line
Data Source
AI summary
Providing an optical system having excellent optical performance with sufficiently correcting spherical aberration and curvature of field, an imaging apparatus, and a method for forming an image by the optical system. The optical system includes a plurality of lens groups, at least one of the plurality of lens groups having an A lens that satisfies at least one of given conditional expressions.