Aspherical Observation Optical System Aberration Correction
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Solution Overview
Problem
Conventional observation optical systems for compact display panels suffer from insufficient aberration correction, particularly in high magnification scenarios, leading to issues like coma and distortion, which affect the observer's experience.
Innovation Solution
The proposed observation optical system consists of a first lens with positive refractive power, a second lens with negative refractive power and a concave surface facing the object side, and a third lens with positive refractive power and a convex surface facing the eyepoint side, incorporating aspherical surfaces and satisfying specific conditional expressions to correct aberrations and ensure compactness and high magnification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional observation optical systems are used for compact display panels, then the system can be implemented, but aberration correction is insufficient leading to poor optical performance
Solution Approach 1:
The patent applies aspherical surfaces to lens elements (specifically the second lens has an aspherical object-side surface and the third lens has an aspherical image-side surface) to correct spherical aberration, coma, and distortion more effectively than conventional spherical surfaces, thereby improving aberration correction without significantly increasing system complexity
Solution Approach 2:
The patent optimizes specific parameter relationships including the conditional expression 0.30 < (R22+R21)/(R22-R21) × 1/(−f2) < 0.50 for the second lens curvature and focal length, and 0.40 < f1/(−f2) < 0.70 for the focal length ratio between first and second lenses, achieving balanced aberration correction across the optical system
2Measurement precision
If high magnification is achieved in observation optical systems, then observation capability is improved, but aberrations such as coma and distortion increase
Solution Approach 1:
The patent assigns different functional characteristics to different lens elements: the first lens (positive power) handles initial convergence, the second lens (negative power with aspherical surface) corrects coma and distortion locally at the object side, and the third lens (positive power with aspherical surface) corrects aberrations at the image side, with each lens optimized for its specific role in the high magnification system
Solution Approach 2:
The patent uses a composite lens structure combining spherical and aspherical surfaces across three lens elements with specific refractive powers, creating a composite optical system that achieves high magnification while correcting multiple types of aberrations simultaneously through the synergistic arrangement of different surface types and powers
3Length of moving object
If compact size is reduced in observation optical systems, then portability is improved, but optical performance and aberration correction deteriorate
Solution Approach 1:
The aspherical surfaces on the second and third lenses enable more compact lens curvatures and shorter focal lengths while maintaining aberration correction, allowing the optical system to be miniimized without sacrificing optical performance
Solution Approach 2:
The patent optimizes the focal length ratios and curvature relationships (f1/(−f2) and (R22+R21)/(R22-R21) × 1/(−f2)) to achieve a compact three-lens configuration that maintains effective aberration correction in a minimized physical package
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
This configuration effectively corrects spherical aberration, distortion, coma, and curvature of field, enabling a compact and high-magnification observation optical system with improved optical performance, particularly in high-magnification applications.
Implementation Method 1
a first lens having positive refractive power, a second lens having negative refractive power and a concave surface facing the object side, and a third lens having positive refractive power and a convex surface facing an eyepoint side, an aspherical surface being included on at least one lens surface
Data Source
AI summary
An observation optical system for observing an object includes, in order from the object side: a first lens having positive refractive power; a second lens having negative refractive power and a concave surface facing the object side; and a third lens having positive refractive power and a convex surface facing an eyepoint side. An aspherical surface is included on at least one lens surface, and given conditional expressions are satisfied, thereby providing a compact observation optical system having excellent optical performance, a viewfinder equipped with the observation optical system, and a method for manufacturing the observation optical system.