Adjustable Head-Mounted Display for IPD and FOV Fit
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Solution Overview
Problem
Conventional head-mounted displays (HMDs) lack adequate adjustment mechanisms to accommodate varying head sizes, face shapes, and eye spacings, leading to discomfort and difficulty in use due to fixed or cumbersome adjustment processes.
Innovation Solution
The HMDs feature adjustable mechanisms for interpupillary distance (IPD) and field of view (FOV) adjustments, including actuators and biasing members for smooth, single-handed operation, and interchangeable components like visors, straps, and face gaskets for customization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional HMDs use fixed lens tube spacing and fixed distance to face, then the device structure is simple, but it cannot accommodate different head sizes, face shapes, and eye spacings
Solution Approach 1:
The patent implements adjustable lens tube spacing through a dynamic mechanism where the lens tubes can move relative to each other along the temple piece. This allows the device to adapt from a fixed structure to a dynamic one, enabling customization for different interpupillary distances while maintaining operational simplicity through spring-loaded automatic positioning
Solution Approach 2:
The patent changes the physical parameters of the HMD by allowing variable spacing between lens tubes and variable distance between the face and lenses. This is achieved through adjustable mechanisms that modify the geometric parameters to match different user anatomies, resolving the contradiction between adaptability and structural simplicity
2Manufacturing precision
If conventional HMDs provide no adjustment for interpupillary distance, then the device structure is simple, but the lens tubes may be horizontally misaligned with the user's eyes
Solution Approach 1:
The patent employs spring-loaded biasing members that automatically exert force to align the lens tubes with the user's eyes. Once the user adjusts the lens tube spacing to their interpupillary distance, the springs automatically maintain precise alignment without requiring continuous manual intervention, achieving both precision and ease of operation
Solution Approach 2:
The patent replaces complex mechanical adjustment systems with a simpler spring-based automatic alignment mechanism. This substitution reduces the complexity of the adjustment system while maintaining high alignment precision through the elastic properties of the biasing members
3Manufacturing precision
If conventional HMDs use fixed distance between display panels and eyes, then the device structure is simple, but the user's field of view may not be optimized
Solution Approach 1:
The patent implements adjustable distance between the display panels and the user's eyes through a dynamic mechanism involving movable components along the nasal bridge. This allows the field of view to be optimized for different users while keeping the adjustment mechanism relatively simple through the use of spring-loaded automatic positioning and geometric constraints
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 comfortable and efficient fitting for diverse users by allowing easy, real-time adjustments of lens spacing and FOV, enhancing user experience and convenience.
Implementation Method 1
A first biasing member coupled to the movable elongate member and to the midframe is configured to resist movement of the movable elongate member in a direction of travel of the elongate member
Implementation Method 2
A gear assembly disposed between the pair of lens tubes is engaged with the movable elongate member such that movement of the movable elongate member causes a corresponding adjustment of the spacing between the pair of lens tubes
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
A head-mounted display comprises a housing and one or more infrared (IR) sensors disposed inside the housing. The housing is made of an IR-transmissive material. An outer surface of the housing is coated with an IR-opaque material. One or more locations on the outer surface are devoid of the IR-opaque material to provide one or more IR-transmissive windows on the housing. The one or more IR sensors are disposed directly behind the one or more IR-transmissive windows.