HMD Ring Mount Circumference Adjustment With Torque-Limited Holding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing head-mounted display (HMD) mount units face challenges in providing a flexible circumference adjustment mechanism that allows for easy mounting and demounting, with existing solutions either lacking fine adjustment capabilities or requiring inconvenient operations to change the circumference.
Innovation Solution
A ring-shaped mount unit with a circumference variable mechanism that includes a first housing with band portions and a second housing with an engagement portion, utilizing a torque limiter and pinion system to enable intuitive enlargement and reduction of the circumference, along with a dial-type operation member for fine adjustments, ensuring comfortable fit and easy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a retention mechanism is provided to prevent the inner belt from moving in a direction where the inner belt is removed from the outer belt, then the HMD can be securely held on the user's head, but it becomes difficult to make fine adjustments to enlarge the circumference of the mount unit
Solution Approach 1:
The mount unit employs a dynamic circumference adjustment mechanism where the inner belt can be selectively engaged or disengaged from the outer belt. The retention mechanism includes engagement protrusions and grooves that allow the inner belt to be held securely when engaged, while also permitting controlled movement when disengaged, enabling both strong holding force and fine adjustment capability
Solution Approach 2:
The mount unit is divided into segmented components including the outer belt, inner belt, and discrete retention mechanisms at multiple positions. This segmentation allows independent adjustment of each segment's engagement state, providing both secure holding when engaged and flexibility for fine adjustments by selectively disengaging specific segments
2Adaptability or versatility
If a rack and pinion is combined with a latching mechanism to enable circumference adjustment, then the mount unit can be adjusted, but the user needs to keep turning the dial to achieve maximum circumference which is inconvenient
Solution Approach 1:
The mount unit incorporates a self-adjusting mechanism where the inner belt's elastic deformation automatically assists the circumference adjustment process. When the user applies force to expand the circumference, the elastic material naturally pushes the retention mechanism to disengage, eliminating the need for continuous dial turning and reducing operational effort
Solution Approach 2:
The adjustment mechanism utilizes periodic engagement and disengagement of retention protrusions with corresponding grooves during circumference adjustment. This periodic action allows the mechanism to transition between locked and adjusted states efficiently, reducing the number of operations needed to achieve maximum circumference adjustment
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 easy and intuitive adjustment of the mount unit's circumference, enhancing user convenience by providing a strong holding force in the enlargement direction while minimizing discomfort and simplifying the mounting and demounting process.
Implementation Method 1
an elastic member 122 attached to link the first housing 104 and the second housing 105. The elastic member 122 causes an elastic force to act in a circumference enlargement direction D1 of the mount unit 100
Implementation Method 2
The torque limiter 115 generates holding torque using a static frictional force with respect to the pinion shaft 117
Data Source
AI summary
A head mounted device includes a ring-shaped mount unit for mounting the head mounted device on a head of a user, the ring-shaped mount unit including a first housing having a band portion on each of both sides thereof and a second housing having an engagement portion to be engaged with the band portion, and the ring-shaped mount unit being formed in a ring shape that enables enlargement and reduction of a circumference thereof by engagement of the band portion with the engagement portion. The head mounted device further includes a circumference holding unit, such as a torque limiter, configured to generate a holding force at least in a circumference enlargement direction of the ring-shaped mount unit.