Optical Member Measurement Reference Members for HMD Alignment
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Solution Overview
Problem
Current measurement methods for optical components in head-mounted display devices, particularly those with free-form surfaces, struggle to accurately determine the relative inclination and positional relationship between multiple surfaces due to limitations in non-contact measurement devices and the complexity of miniaturized optical systems required for high performance and smaller size.
Innovation Solution
The optical member incorporates multiple optically effective surfaces and associated measurement reference members, which serve as references for positioning, allowing for accurate measurement and positioning of these surfaces using a combination of contact and non-contact measurement devices, enabling comprehensive evaluation of optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If non-contact measurement devices are used to measure optical surfaces, then measurement speed and efficiency are improved, but measurement precision deteriorates when the surface inclination is steep
Solution Approach 1:
The patent introduces measurement reference members as intermediary elements that bridge the gap between the optical surfaces to be measured and the measurement devices. These reference members provide stable, easily measurable geometric features (edges, planes) that serve as mediators for determining the positional relationships of the actual optical surfaces, enabling accurate measurement even when the optical surfaces themselves are difficult to measure directly.
Solution Approach 2:
The patent divides the measurement task into separate components: measuring the measurement reference members independently using non-contact devices, and then using those measurements to infer the positional relationships of the optical surfaces. This segmentation allows each part to be measured with the most appropriate method, combining the efficiency of non-contact measurement with the accuracy needed for complex geometries.
2Weight of stationary object
If the optical system is miniaturized to reduce device size and weight, then the portability and wearability are improved, but the optical performance and measurement accuracy deteriorate
Solution Approach 1:
The patent adds a new dimension to the miniaturized optical system by incorporating measurement reference members that extend beyond the immediate optical surfaces. These reference members provide additional geometric features in different spatial dimensions that can be measured to determine the positional relationships of the compact optical components, enabling accurate measurement and positioning even in miniaturized configurations.
3Manufacturing precision
If complex optical components with multiple free-form surfaces are used to achieve high optical performance, then the optical quality is improved, but the measurement and positioning difficulty increases
Solution Approach 1:
The patent introduces measurement reference members as intermediary elements that bridge the gap between the optical surfaces to be measured and the measurement devices. These reference members provide stable, easily measurable geometric features (edges, planes) that serve as mediators for determining the positional relationships of the actual optical surfaces, enabling accurate measurement even when the optical surfaces themselves are difficult to measure directly.
Data Source
AI summary
An optical member includes a plurality of optically effective surfaces, anda plurality of measurement reference members that are associated with the plurality of optically effective surfaces and each of which serves as a reference for positioning of the plurality of optically effective surfaces. In this case, a relative positional relationship of the optically effective surfaces can be determined, and the optical performance of the optical member can be accurately evaluated.