Two-Lens Observation Optics for Compact Aberration Correction
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Solution Overview
Problem
There is a demand for an observation optical system that is reduced in size while maintaining favorable optical performance, as existing systems are often large and compromise on optical quality.
Innovation Solution
The observation optical system consists of two lenses, an objective lens with negative refractive power and an eyepiece lens with positive refractive power, configured to satisfy specific conditional expressions that optimize size reduction and optical performance, including conditions on curvature radii, focal lengths, refractive indices, and lens thicknesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If existing optical systems are used, then optical performance can be maintained, but the system size becomes large
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive indices (N1, N2, N3), Abbe numbers (ν1, ν2, ν3), and curvature radii (R1 through R6) of the three lenses to satisfy specific conditional expressions. This enables compact optical system design while maintaining favorable optical performance by optimizing the interplay between these parameters
Solution Approach 2:
The patent employs composite material principles by selecting specific lens materials with defined refractive indices and Abbe numbers for each lens element. The objective lens uses material with N1=1.8061 and ν1=35.86, the first positive lens uses N2=1.6200 and ν2=60.33, and the second positive lens uses N3=1.7556 and ν3=26.49, creating a composite optical system that balances size and performance
2Volume of moving object
If the optical system is reduced in size, then compactness is achieved, but optical performance may deteriorate
Solution Approach 1:
The patent maintains optical quality in compact design by enforcing parameter constraints through conditional expressions that govern the relationships between curvature radii, focal lengths, and material properties. These expressions ensure that even in a reduced-size configuration, the optical parameters remain within ranges that deliver favorable optical performance
Solution Approach 2:
The patent utilizes curved lens surfaces with specifically designed curvature radii (R1 through R6) to achieve both compactness and optical quality. The aspherical or curved surfaces enable effective light control in a shortened optical path, maintaining imaging quality while reducing overall system size
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 design with improved optical performance by effectively correcting various aberrations and maintaining optical quality in peripheral regions.
Implementation Method 1
two lenses including an objective lens having a negative refractive power and an eyepiece lens having a positive refractive power
Data Source
AI summary
An observation optical system consisting of, in order from an object side to an eyepoint side, two lenses including an objective lens having a negative refractive power and an eyepiece lens having a positive refractive power, wherein, in a case where: a paraxial curvature radius of a surface of the eyepiece lens on the eyepoint side is denoted by R4, a paraxial curvature radius of a surface of the objective lens on the eyepoint side is denoted by R2, Conditional Expressions (1) is satisfied: 1.7<(R4−R2)/(R4+R2)<4(1).