Astigmatic Optical Testing Using Ring-Shaped Collimated Light
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for testing astigmatic optical test objects, such as spectacle lenses for AR/VR applications, are limited in their ability to accurately measure relevant optical parameters, particularly the cylindrical axis or main axis, and do not effectively handle waveguides or combined astigmatic properties.
Innovation Solution
An apparatus and method using a ring-shaped mask element, or ring reticle, to emit collimated test light and evaluate images for determining the axis position and optical parameters of astigmatic optical test objects, allowing for accurate and reliable measurement of multiple alignments and directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a manual lensmeter is used to characterize spectacle lenses, then the operator can perform measurements, but the handling complexity and time consumption increase while accuracy may be insufficient due to resolution limitations of ≥0.125 dpt
Solution Approach 1:
The patent replaces the manual mechanical lensmeter system with an automated optical testing system. The illumination device projects test patterns through the spectacle lens, and a sensor array automatically captures and analyzes the refracted light patterns to determine optical parameters, eliminating manual operation while achieving higher measurement precision through digital image processing
Solution Approach 2:
The testing system performs self-measurement by automatically capturing images of test patterns through the spectacle lens and computing optical parameters from the captured data. The system independently determines refractive power, astigmatism, and axis orientation without requiring operator intervention, thereby improving both accuracy and operational efficiency
2Adaptability or versatility
If traditional lensmeters are used, then basic measurements can be performed, but the ability to measure waveguides and AR/VR components with astigmatic properties is insufficient
Solution Approach 1:
The testing apparatus is designed with universal applicability to measure multiple types of optical components including traditional spectacle lenses, waveguides, and AR/VR optical elements. The system uses configurable illumination patterns and advanced image analysis algorithms that can adapt to different component geometries and optical properties, providing accurate measurements across diverse applications
Solution Approach 2:
The patent employs two-dimensional sensor arrays and multi-directional test pattern projection to capture optical properties in multiple dimensions simultaneously. This enables accurate measurement of complex astigmatic properties and orientation-dependent characteristics of modern optical components that traditional one-dimensional lensmeters cannot measure
3Productivity
If automated systems are introduced to improve measurement speed, then productivity increases, but device complexity increases
Solution Approach 1:
The testing system is divided into modular functional units: an illumination device for pattern projection, a test object holder, a sensor array for image capture, and a processing unit for data analysis. This segmentation allows each component to be optimized independently while working together to achieve fast, accurate measurements with reduced overall system complexity
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
Enables precise determination of the axis position and measurement of relevant optical parameters, including MTF, in astigmatic optical test objects, overcoming limitations of traditional methods by providing accurate and efficient characterization of AR/VR components.
Implementation Method 1
a collimation lens or collimation optical unit, wherein the illumination device is configured to emit to the test object light passing through the ring-shaped mask element in the form of a collimated test light
Implementation Method 2
an evaluation device, which is configured to record and evaluate an image generated by the test object in response to the test light in order to determine an axis position of the test object
Data Source
AI summary
An apparatus for testing an astigmatic optical test object is provided. The apparatus comprises an illumination device having a light source, a ring-shaped mask element and a collimation optical unit. The collimation optical unit is formed to emit to the test object light beams of the ring-shaped mask element illuminated by the light source in the form of collimated test light. The apparatus also comprises an evaluation device, which is configured to record and evaluate an image generated by the test object in response to the test light in order to determine an axis position of the test object and an optical parameter related to the axis position.