Head-Mounted Optical Module With Nested Lens and Contaminant Filtration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing head-mounted devices face challenges in accommodating the specific distances between display screens and lenses, leading to larger package sizes and potential damage from external contaminants.
Innovation Solution
The optical module includes a housing assembly with a lens retained between portions, a vent port for air circulation, a filter to prevent foreign particles, and a catadioptric lens system, along with an infrared emitter and eye camera for enhanced functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the display assembly and lens are positioned at specific distances to achieve proper optical focus, then the optical performance is improved, but the device requires a larger package size
Solution Approach 1:
The lens is nested within a dedicated lens retention structure formed by channels in the housing assembly, allowing the lens to be securely positioned within the available space. This nesting approach enables precise optical positioning without requiring additional external space, thereby resolving the contradiction between optical focus precision and compact package size.
Solution Approach 2:
The housing assembly incorporates channels that extend in multiple dimensions to retain the lens, transforming the single-dimensional space constraint into a multi-dimensional retention system. This allows the lens to be positioned at the required distance from the display assembly while maintaining a compact overall footprint through efficient spatial utilization.
2Volume of moving object
If the device is made more compact to reduce size, then the package size is reduced, but the risk of damage from external contaminants increases
Solution Approach 1:
The housing assembly is segmented into multiple portions with dedicated channels for different components. The lens is retained within sealed channels that are separate from the display assembly and other sensitive components. This segmentation allows for compact packaging while maintaining protective barriers between components and external contaminants, reducing the risk of damage despite the reduced size.
Solution Approach 2:
The housing assembly acts as an intermediary protective structure between the compacted components and external contaminants. The channels and housing portions create a protective interface that shields the lens and other sensitive components from dust and debris while allowing the overall device to maintain a compact form factor.
3Object-affected harmful factors
If a sealed housing is used to protect components from contaminants, then protection is improved, but air circulation and heat dissipation are restricted
Solution Approach 1:
The housing assembly provides localized protection through dedicated channels for the lens that are sealed against contaminants, while other portions of the housing maintain ventilation features. This local quality approach allows the lens area to be protected from contaminants while maintaining overall air circulation and heat dissipation pathways in other regions of the housing.
Solution Approach 2:
The housing assembly incorporates filter elements with controlled porosity that allow air circulation while blocking contaminants. The porous structure enables heat dissipation through the housing while maintaining the protective seal against external contaminants, resolving the contradiction between protection and thermal management.
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 reduces the device's overall size while protecting sensitive components and enabling advanced features like biometric identification and gaze tracking.
Implementation Method 1
a catadioptric lens system
Implementation Method 2
a catadioptric lens system
Implementation Method 3
An infrared emitter is located between the lens and the display assembly in the internal space of the optical module housing assembly. The infrared emitter is configured to emit infrared radiation through the lens.
Data Source
AI summary
A head-mounted device is configured to present content to a user and includes a housing, a first optical module coupled to the housing, a second optical module coupled to the housing, an interpupillary distance adjustment assembly configured to support the first optical module and the second optical module with respect to the housing to allow adjustment of a distance between the first optical module and the second optical module, and one or more user-facing cameras configured to obtain images of the eyes of the user. The interpupillary distance adjustment assembly is configured to match the distance between the first optical module and the second optical module with the spacing between the eyes of the user.