Nose Pressure Sensor Feedback for Head-Mounted Optical Assembly Spacing
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Solution Overview
Problem
Customizing electronic devices, such as head-mounted devices, to accommodate varying interpupillary distances of users is challenging due to the need for adjustable optical assemblies that prevent discomfort from nose pressure.
Innovation Solution
Incorporating optical assembly positioning systems with motors and nose pressure sensors, including air pressure sensors and compressible air-filled chambers, to adjust the spacing of optical assemblies and halt movement when nose pressure exceeds a threshold, ensuring comfortable fit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If optical assemblies are made adjustable to accommodate different interpupillary distances, then adaptability is improved, but device complexity increases due to the need for motors and positioning systems
Solution Approach 1:
The patent implements a feedback mechanism where nose pressure sensors continuously monitor the pressure exerted on the user's nose by the optical assemblies. This feedback signal is used by the control system to automatically adjust the motor-driven optical assembly positioning, halting movement when optimal pressure is detected. This closed-loop feedback system enables automatic adaptation to different users without requiring complex manual adjustment mechanisms.
Solution Approach 2:
The system performs self-adjustment by using the nose pressure sensor feedback to automatically control the motor positioning of optical assemblies. The device serves itself by detecting the user's nasal pressure and autonomously adjusting the optical assembly spacing to match the user's interpupillary distance, eliminating the need for external intervention or complex manual calibration procedures.
2Object-affected harmful factors
If nose pressure sensors are added to detect and respond to nose pressure, then user comfort is improved, but device complexity increases due to additional sensing components
Solution Approach 1:
The patent introduces nose pressure sensors as intermediary elements that mediate between the optical assemblies and the user's nose. These sensors indirectly measure the contact pressure by detecting changes in air pressure within sealed chambers positioned near the nose interface. This intermediary sensing approach allows the system to detect nose pressure without requiring direct mechanical contact sensors, simplifying the overall sensing mechanism while effectively preventing discomfort.
3Adaptability or versatility
If optical assemblies are moved closer together to accommodate smaller interpupillary distances, then adaptability is improved, but nose pressure increases causing discomfort
Solution Approach 1:
The control system uses real-time feedback from nose pressure sensors to monitor the pressure exerted on the user's nose during optical assembly adjustment. When the sensors detect that nose pressure has reached an optimal threshold, the system automatically halts further movement of the optical assemblies, even if the adjustment is not complete. This feedback-controlled stopping mechanism ensures that adaptability is achieved without exceeding comfortable pressure limits.
Solution Approach 2:
The system preemptively prevents excessive nose pressure by using the nose pressure sensors to detect approaching pressure thresholds before discomfort occurs. The control algorithm anticipates potential over-compression and automatically adjusts or halts the motor-driven optical assembly movement in advance, preventing harmful pressure buildup while still achieving the necessary interpupillary distance accommodation.
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
The solution allows for precise adjustment of optical assemblies to match individual interpupillary distances, preventing discomfort by detecting and responding to nose pressure, thereby enhancing user comfort and device usability.
Implementation Method 1
The nose pressure sensors may include air pressure sensors and nose-pressure-sensing compressible air-filled chambers coupled to the air pressure sensors
Data Source
AI summary
A head-mounted device may include optical assemblies for presenting images to a user. Optical assembly positioning systems may be used to adjust the spacing between the optical assemblies to accommodate different interpupillary distances. The optical assembly positioning systems may have motors. Nose pressure sensors may be provided to detect nose pressure as optical assemblies are moved towards each other and towards nose surfaces by the motors. Motion of the optical assemblies can be halted whenever the detected nose pressure rises. The nose pressure sensors may each include an air pressure sensor and a pressure-sensing compressible air-filled chamber coupled to the air pressure sensor.