Optical Assembly Immersion for HMD Stability
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Solution Overview
Problem
Head-mounted display devices face challenges in maintaining mechanical stability and accuracy due to environmental factors like temperature fluctuations and mechanical shocks, which affect the alignment of optical lens assemblies and the quality of movement detection.
Innovation Solution
The use of optical assemblies comprising two or more optical elements with an enclosure and fillers in contact with the elements and enclosure, providing improved mechanical support and thermal expansion matching to reduce the impact of environmental factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional optical lens assemblies are used in head-mounted display devices, then the device can provide visual information to users, but the optical elements are susceptible to misalignment due to mechanical shocks and temperature fluctuations
Solution Approach 1:
The patent applies beforehand cushioning by immersing optical elements in a filler material (such as epoxy or silicone) that is applied in advance within the enclosure. This filler material provides mechanical support and shock absorption before external mechanical shocks occur, preventing misalignment of the optical elements while maintaining their optical alignment precision
Solution Approach 2:
The patent utilizes parameter changes by selecting a filler material with specific thermal expansion properties that match or are compatible with the optical elements. This parameter matching ensures that during temperature fluctuations, the filler and optical elements expand or contract together, maintaining relative positional stability and preventing alignment errors
2Stability of the object's composition
If optical elements are secured rigidly to prevent movement, then mechanical stability improves, but tolerance for temperature fluctuations decreases due to differential thermal expansion
Solution Approach 1:
The patent changes the physical parameters of the mounting medium by using a filler material with tailored thermal expansion characteristics. This filler material is selected to have thermal expansion properties that match the optical elements, allowing the system to tolerate temperature fluctuations without generating stress or misalignment, while still providing adequate mechanical support
Solution Approach 2:
The patent employs composite materials by combining the optical elements with a filler material that has complementary properties. The filler material acts as a composite medium that provides both mechanical support and thermal expansion compatibility, creating a hybrid structure that achieves both rigidity and temperature tolerance
3Object-affected harmful factors
If fillers are introduced to provide mechanical support, then shock resistance improves, but the complexity of assembly increases
Solution Approach 1:
The patent merges multiple functions into the filler material: it simultaneously provides mechanical support, shock absorption, and thermal expansion matching. This consolidation eliminates the need for separate mounting structures, adhesives, and alignment mechanisms, thereby reducing overall assembly complexity while achieving superior shock resistance
Solution Approach 2:
The filler material serves as an intermediary substance that fills the enclosure space and mediates between the optical elements and external environmental factors. This intermediary provides mechanical coupling and protection without requiring complex fastening or mounting hardware, simplifying the assembly process
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 enhances mechanical performance and stability, maintaining accurate optical measurements and reducing the effects of thermal expansion, especially beneficial for wide-angle optical sensors in head-mounted display systems.
Implementation Method 1
The disclosed optical assemblies provide for improved support against mechanical shocks
Implementation Method 2
The one or more fillers are in contact with the second optical surface and the third optical surface... increased tolerance for temperature fluctuations
Data Source
AI summary
A method of making an optical assembly includes obtaining a first optical element having a first optical surface and a second optical surface that is opposite to the first optical surface, and a second optical element having a third optical surface and a fourth optical surface that is opposite to the third optical surface. The second optical element is distinct and separate from the first optical element. The method also includes obtaining an enclosure configured to enclose the first optical element and the second optical element. The method further includes providing one or more fillers in the enclosure so that the one or more fillers are in contact with the second optical surface and the third optical surface, thereby making the optical assembly. Also disclosed are an optical assembly made by the method and an optical imaging device including the optical assembly.