Aspherical Lens Optical System for Wide-Angle Aberration Correction
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Solution Overview
Problem
Conventional triple-pass optical systems for display devices, particularly those with high angles of view like 80 degrees or more, face challenges in correcting chromatic aberration and other lens aberrations.
Innovation Solution
The optical system includes a first lens group with a transparent element, a first aspherical lens, and a second aspherical lens, arranged sequentially. The second aspherical lens has a positive refractive power facing the image display surface, and the first aspherical lens has a higher absolute focal length and a smaller Abbe number than the second aspherical lens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a triple-pass optical system is used to make the display device thinner, then the device thickness is reduced, but chromatic aberration and other lens aberrations become difficult to correct
Solution Approach 1:
The optical system is divided into multiple lens groups (first lens group with aspherical lenses and second lens group with Plano-convex lenses) positioned at different locations in the optical path. This segmentation allows each group to address specific aberrations independently while maintaining the compact triple-pass structure.
Solution Approach 2:
Different lens elements are assigned specific optical characteristics tailored to their positions and functions. The aspherical lenses in the first group have specific aspherical coefficients designed to correct chromatic aberration, while the Plano-convex lenses in the second group are optimized for their location, creating localized optical quality improvements throughout the system.
2Adaptability or versatility
If the angle of view is increased to 80 degrees or more for wider coverage, then the field of view is expanded, but chromatic aberration correction becomes more difficult
Solution Approach 1:
Aspherical lenses with specific aspherical coefficients are used instead of conventional spherical lenses. The aspherical surfaces provide better control over light rays at large angles, enabling the system to maintain chromatic aberration correction while achieving an angle of view of 80 degrees or more.
Solution Approach 2:
The optical system uses carefully selected refractive indices and aspherical coefficients for the lens materials. By optimizing these parameters, the system achieves both wide angle of view and effective chromatic aberration correction, resolving the contradiction between field coverage and optical precision.
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 easy correction of chromatic aberration and other aberrations, improving the optical system's resolution and maintaining image quality across a wide angle of view.
Implementation Method 1
a first lens group provided with a transparent element having a first transflective surface, a first aspherical lens, and a second aspherical lens having a second transflective surface
Implementation Method 2
This triple-pass optical system folds back the optical path of an image from display elements twice using two reflecting surfaces
Data Source
AI summary
To facilitate the correction of aberrations of lenses in an optical system. The optical system is used to observe an image displayed on an image display surface of a display element from an observation unit. The optical system includes a first lens group and a second lens group. The first lens group is provided with a transparent element having a first transflective surface, a first aspherical lens, and a second aspherical lens having a second transflective surface, which are arranged sequentially in order from the observation unit. The second transflective surface is formed on the side of the second aspherical lens with a positive refractive power facing the image display surface. The second lens group is arranged between the first lens group and the image display surface and is provided with at least one aspherical lens. The first aspherical lens has a higher absolute focal length than the second aspherical lens, and the first aspherical lens has a smaller Abbe number at a d-line than the second aspherical lens.