Head-Mounted Display Adjustable Arm Rotation Limiting Mechanism
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Solution Overview
Problem
Conventional VR glasses struggle to accommodate users with varying head sizes, leading to discomfort due to either over-tightness or looseness, and inadequate clamping force, which results in device slippage.
Innovation Solution
A head-mounted display device with adjustable arms that feature pivotally connected ends and adjusting pieces on the pivot paths, allowing users to limit the angle of rotation to match their head size, maintaining a secure clamping force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the arm is designed with fixed size and structure, then the manufacturing is simple, but it cannot adapt to users with different head sizes
Solution Approach 1:
The arm structure is transformed from a fixed rigid structure to a dynamic adjustable structure. The arm includes an adjusting piece that can be positioned at different locations along the arm's length, allowing the arm's effective length and clamping force to be dynamically adjusted to match different user head sizes, thereby resolving the contradiction between adaptability and structural simplicity
Solution Approach 2:
The arm is segmented into multiple functional sections: a main arm body, an adjusting piece with positioning features, and connection points. This segmentation allows the adjusting piece to be independently positioned at different locations, enabling size adaptation without requiring complete redesign of the entire arm structure
2Force
If the plastic deformation critical force is increased to achieve good clamping force, then the wearing stability is improved, but the difficulty for user to bend the temples increases
Solution Approach 1:
The arm incorporates a dynamic adjustment mechanism where the adjusting piece can be temporarily displaced from its engagement position with the main frame, allowing the arm to be bent with reduced force. Once positioned, the adjusting piece engages to provide the necessary clamping force, thus resolving the contradiction between ease of adjustment and maintenance of clamping force
Solution Approach 2:
The adjusting piece is pre-positioned at different locations along the arm to correspond to different head sizes. Before adjustment, the user selects the appropriate position; during adjustment, the piece is temporarily disengaged to allow bending; after adjustment, it re-engages to maintain clamping force. This preliminary positioning reduces the force needed during the adjustment process
3Ease of operation
If the plastic deformation critical force is decreased to allow easy bending, then the ease of operation is improved, but the clamping force is weakened causing device slippage
Solution Approach 1:
The system dynamically transitions between two states: during adjustment, the arm is flexible and easy to bend as the adjusting piece is disengaged; during normal wear, the adjusting piece engages to provide strong clamping force and prevent slippage. This dynamic state change resolves the contradiction between ease of operation and wearing stability
Solution Approach 2:
The adjusting piece acts as an intermediary mechanism between the user's adjustment action and the final clamping state. It mediates the transition from a low-force adjustment mode to a high-force wearing mode, allowing easy bending during adjustment while ensuring strong clamping force during use, thus resolving the contradiction between ease of operation and reliability
Data Source
AI summary
A head-mounted display device includes a display portion, a main frame, two arms, and two adjusting pieces. The main frame carries the display portion. The arms are disposed on opposite sides of the main frame, and the end portions of the arms are pivotally connected to the main frame such that the arms are adapted to rotate away from the main frame during an unfolding process and adapted to rotate toward the main frame during a folding process. The adjusting pieces are respectively disposed on pivot paths of the arms, and the adjusting piece is adapted to from a structural interference with the corresponding arm and the main frame during the unfolding process to limit a degree of rotation of the arm.