Real-Image Observation Optical System with Aspherical Eyepiece
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Solution Overview
Problem
Existing observation optical systems for loupes, such as those used in medical care and manual work, face challenges in reducing size and weight while maintaining effective aberration correction, leading to insufficient performance due to the configuration of positive and negative objective lenses.
Innovation Solution
A real-image type observation optical system comprising an objective system with a cemented lens combination of negative and positive power lenses, a reverse-erecting system using prisms, and an eyepiece system with aspherical lenses to correct high-order aberrations, including spherical and distortion aberrations, while minimizing size and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If the observation optical system uses a simple positive and negative lens configuration for the objective, then the system size and weight are reduced, but the aberration correction becomes insufficient
Solution Approach 1:
The objective lens is segmented into multiple positive and negative lenses arranged in specific groups. This segmentation allows each lens to contribute to different aspects of aberration correction while maintaining a compact overall structure, resolving the contradiction between size and correction performance
Solution Approach 2:
The objective lens uses a composite configuration combining multiple positive and negative lens elements with different refractive indices and aberration characteristics. This composite approach enables simultaneous correction of various aberrations within a compact design, addressing both weight reduction and performance requirements
2Ease of manufacture
If the eyepiece system uses conventional lens configurations, then the manufacturing process is simpler, but high-order aberrations such as spherical and distortion aberrations are not adequately corrected
Solution Approach 1:
The eyepiece system incorporates aspherical lenses with specific curvature coefficients to correct high-order aberrations. The aspherical surfaces provide precise control over light rays, enabling effective correction of spherical and distortion aberrations while maintaining manufacturability through established aspherical lens fabrication processes
Solution Approach 2:
The eyepiece system uses lenses with specific aspherical coefficients and curvature parameters that are optimized to correct high-order aberrations. By carefully selecting and adjusting these parameters, the system achieves precise aberration correction without excessive manufacturing complexity
3Reliability
If the objective system uses a cemented lens combination with specific power distribution, then aberration correction is improved, but the system complexity increases
Solution Approach 1:
The objective system merges positive and negative lenses into cemented lens combinations, where adjacent lenses are optically bonded. This merging reduces the number of air-glass interfaces and overall system length while maintaining effective aberration correction, balancing performance improvement with complexity control
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 favorable aberration correction, enabling a smaller and lighter optical system with improved performance by increasing the power of the objective and eyepiece systems and using aspherical lenses to suppress high-order aberrations, thus allowing for effective manual work without disturbing the user.
Implementation Method 1
an objective system consisting essentially of, in order from the object side, a first lens having a negative power and a second lens having a positive power
Implementation Method 2
a reverse-erecting system configured to erect an inverted image formed by the objective system
Implementation Method 3
an eyepiece system configured to allow a pupil to observe an erect image formed by the reverse-erecting system, wherein the eyepiece system consists essentially of, in order from the object side, a third lens having a positive power, a fourth lens having a negative power, a fifth lens having a positive power, and a sixth lens having a positive power
Data Source
AI summary
An observation optical system of a real-image type includes, in order from the object side, an objective system, a reverse-erecting system that erects an inverted image formed by the objective system, and an eyepiece system that allows a pupil to observe an erect image formed by the reverse-erecting system. The objective system includes, in order from the object side, a first lens having a negative power and a second lens having a positive power. The eyepiece system includes, in the order from the object side, a third lens having a positive power, a fourth lens having a negative power, a fifth lens having a positive power, and a sixth lens having a positive power.