Eyepiece Optical System Aberration Correction
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Solution Overview
Problem
Existing eyepiece optical systems for electronic viewfinders face challenges in achieving high observation magnification and optical performance while maintaining a compact size, often resulting in increased lens thickness and difficulty in correcting aberrations such as field curvature and chromatic aberration of magnification when observing small image display panels with large viewing angles.
Innovation Solution
The eyepiece optical system consists of two lenses with specific refractive powers and curvature radii, where a first lens has negative refractive power and a second lens has positive refractive power, with carefully defined conditional expressions to optimize lens shape and configuration, ensuring high observation magnification and corrected aberrations within a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the number of lenses is reduced to downsize the observation apparatus, then the size is reduced, but the optical performance and aberration correction deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the curvature radii of lens surfaces through the conditional expressions (r11+r12)/(r11-r12) and (r21+r22)/(r21-r22). This allows optimization of the two-lens system to achieve high optical performance with reduced lens count, resolving the contradiction between compact size and optical quality.
2Illumination intensity
If the viewing angle is increased for small image display panels, then visibility is improved, but field curvature and chromatic aberration increase
Solution Approach 1:
The patent applies local quality by giving different curvature characteristics to different lens surfaces. The first lens has specific curvature radii (r11, r12) and the second lens has specific curvature radii (r21, r22), with each surface optimized for its local function. This enables wide viewing angle with corrected aberrations across the image display plane.
3Measurement precision
If observation magnification is increased, then visibility is improved, but lens thickness and system complexity increase
Solution Approach 1:
The patent applies segmentation by dividing the optical system into two distinct lens units with complementary functions. The first lens (with negative refractive power) and second lens (with positive refractive power) are segmented to achieve high magnification while keeping individual lens thicknesses small, avoiding the need for a single thick lens.
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 allows for a small eyepiece optical system with a wide viewing angle and high optical performance, effectively correcting field curvature, chromatic aberration, and other aberrations, while maintaining a compact size and achieving high magnification.
Implementation Method 1
the eyepiece optical system includes a plurality of lenses consisting of, in order from the image display plane side to an observation side, a first lens having a negative refractive power and a second lens having a positive refractive power
Data Source
AI summary
Provided is an observation apparatus including an image display element and an eyepiece optical system to be used to observe an image displayed on the image display element, in which the eyepiece optical system includes a plurality of lenses consisting of, in order from an image display plane side to an observation side, a first lens having a negative refractive power and a second lens having a positive refractive power, and in which a paraxial curvature radius of a lens surface on the image display plane side of the first lens, a paraxial curvature radius of a lens surface on the observation side of the first lens, a paraxial curvature radius of a lens surface on the image display plane side of the second lens, and a paraxial curvature radius of a lens surface on the observation side of the second lens are set appropriately.