Pulley-Based VR Headset Strap Adjustment for Multi-User Fit
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Solution Overview
Problem
Existing artificial reality head-wearable devices lack an efficient strap system that can accommodate a wide range of user head sizes without requiring multiple straps, leading to discomfort and inefficiency when multiple users with different head sizes share the device.
Innovation Solution
A head-wearable device with a retractable side strap system that uses a tensioned cable and adjustment mechanism, allowing the strap to travel farther into the housing, enabling adjustment to fit various head sizes by changing the exposed length of the strap, thereby accommodating multiple users with different head sizes using a single strap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple straps are used to accommodate different head sizes, then the device can fit various users, but the device complexity and strap management become more complex
Solution Approach 1:
The patent implements a universal strap system where a single retractable strap with cable-spooling portions can serve multiple functions - accommodating different head sizes through adjustment mechanisms rather than requiring separate straps for different users. The cable-spooling design allows one strap to perform the work of multiple fixed-length straps.
Solution Approach 2:
The patent transforms the static, fixed-length strap into a dynamic, adjustable strap system. The cable-spooling portions and adjustment mechanisms enable the strap length to change dynamically based on user needs, allowing continuous adjustment rather than discrete size options.
2Adaptability or versatility
If the strap length is extended to accommodate larger head sizes, then more users can be fitted, but the strap becomes harder to manage and secure
Solution Approach 1:
The patent introduces cable-spooling portions as intermediary elements between the adjustment mechanism and the strap ends. These spooling portions act as mediators that translate rotational adjustment motion into linear strap extension/retraction, making it easier to control and secure the strap at various lengths.
Solution Approach 2:
The cable-spooling design enables the strap system to self-regulate and maintain tension automatically. As the adjustment mechanism rotates the cable-spooling portions, the cable naturally winds and unwinds to maintain proper tension without requiring additional manual intervention or complex locking mechanisms.
3Adaptability or versatility
If the strap is made retractable with cable-spooling portions, then adjustment range increases, but the device complexity increases
Solution Approach 1:
The patent divides the adjustment mechanism into distinct functional segments - the cable-spooling portions are separated from the main adjustment mechanism, allowing each component to be optimized independently. The cable-spooling portions handle the extension/retraction function while the adjustment mechanism handles the tension control, simplifying the overall design.
Solution Approach 2:
The cable-spooling portions are nested within the housing structure, with the cables running through guide paths and anchor points that are integrated into the existing device architecture. This nesting approach minimizes the additional space required and reduces the visual and structural complexity of the adjustment system.
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 provides a comfortable and secure fit for a variety of head sizes without the need for multiple straps, enhancing user experience and reducing the complexity of strap management in shared devices.
Implementation Method 1
The cable is configured such that a first end coupled to a first cable-spooling portion of the adjustment mechanism, an intermediary portion of the cable that travels around the anchor point and is coupled with a portion of the retractable side strap, and a second end coupled to a second cable-spooling portion of the adjustment mechanism
Implementation Method 2
at least one of the adjustment mechanism and the anchor point maintain the cable at a predetermined tension
Data Source
AI summary
Systems and methods are provided for a head-wearable device. The head-wearable device can include a display, a retractable side strap, and a housing. The housing includes an anchor point, an adjustment mechanism configured to change an exposed length of the retractable side strap, and a cable. The cable includes a first end and a second end coupled the cable-spooling portion of the adjustment mechanism and an intermediary portion of the cable that travels around the anchor point and is coupled to the retractable side strap. The cable is maintained at a predetermined tension by at least the adjustment mechanism or the anchor point. When the adjustment mechanism is adjusted, the cable winds/unwinds around the first or second cable-spooling portion of the adjustment mechanism, adjusting the exposed length of the retractable side strap to accommodate for different head sizes for users of the head-wearable device.