Observation Optical System for Compact Wide-Field Aberration Correction
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Solution Overview
Problem
Existing observation optical systems face challenges in achieving both size reduction and high performance specifications while maintaining favorable optical characteristics.
Innovation Solution
An observation optical system comprising a display element and an eyepiece lens with specific configurations, including a first lens with positive refractive power, a second lens with negative refractive power, and a rear side lens group, adhering to conditional expressions that optimize lens parameters for size reduction and aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the eyepiece lens uses conventional lens configurations, then the optical system can maintain standard performance, but the size cannot be reduced
Solution Approach 1:
The patent applies parameter changes by precisely controlling specific lens parameters including the refractive indices (N1, N2) of the first and second lenses, the thickness (d2) of the second lens, and the curvature radius (R2f) of the second lens surface. By satisfying conditional expressions (1) through (10) that define specific ranges for these parameters, the patent achieves both size reduction and maintained optical performance. This systematic parameter optimization allows compact design while correcting aberrations effectively.
2Adaptability or versatility
If the eyepiece lens is designed for high specifications with wide field of view, then the apparent field of view increases, but the system size increases
Solution Approach 1:
The patent applies local quality by assigning specific functional characteristics to different lens components. The first lens (positive refractive power) and second lens (negative refractive power) have specifically optimized local properties including their refractive indices and surface curvatures. The rear side lens group contains two or more lenses with tailored characteristics. This localized optimization of each component's quality enables the entire system to achieve wide apparent field of view while maintaining compact overall size.
3Volume of moving object
If the lens parameters are optimized for size reduction, then the system becomes compact, but aberration correction becomes difficult
Solution Approach 1:
The patent systematically changes and optimizes multiple lens parameters simultaneously to resolve the contradiction between size reduction and aberration correction. By defining specific conditional expressions (1) through (10) that establish interrelated parameter ranges—including refractive indices, thicknesses, and curvature radii—the patent achieves compact size while maintaining effective aberration correction. This multi-parameter coordination ensures that no single parameter compromise degrades overall optical performance.
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 both size reduction and high performance by effectively correcting various aberrations and securing a wide apparent field of view, while maintaining a compact design.
Implementation Method 1
a first lens having positive refractive power
Implementation Method 2
a second lens having negative refractive power
Data Source
AI summary
An observation optical system includes a display element and an eyepiece lens arranged on an eyepoint side of the display element. The eyepiece lens consists of a first lens having positive refractive power, a second lens having negative refractive power, and a rear side lens group including two or more lenses consecutively in order from a side closest to the display element to the eyepoint side. In a case where a half value of a longest diameter of a display region in the display element is denoted by H, and a focal length of the eyepiece lens is denoted by f, the observation optical system satisfies a conditional expression represented by 0.3<H/f<0.5.