Resilient Lens Holding Frame for HMD
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Solution Overview
Problem
Existing HMD devices face challenges in precisely and reproducibly fixing correction lenses relative to the projection optics, and the use of magnetic connections may not be desirable.
Innovation Solution
A lens holding frame made of resilient material, such as stainless steel, with a nose bridge and connecting means that can be reversibly connected to an HMD device by stretching into a transitional shape and using central and lateral connecting mechanisms for secure, adjustable, and reproducible positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic connecting devices are used to attach correction lenses to HMD device, then stable connection is achieved, but magnetic devices may not be wanted and positioning precision cannot be ensured
Solution Approach 1:
The patent replaces magnetic connection mechanisms with a mechanical stretching system. The lens holding frame is made of resilient material that can be stretched between two connecting means on the HMD device. When stretched, the frame creates a stable mechanical connection while maintaining precise positioning capability through the defined geometry of the connecting means and frame structure, eliminating the need for magnetic fields while achieving both stability and precision.
Solution Approach 2:
The patent utilizes the elastic properties of the resilient material to change its physical state between stretched and relaxed configurations. The material's ability to deform and return to its original shape provides both the connection force needed for stability and the geometric precision for accurate lens positioning, resolving the contradiction between these two requirements.
2Manufacturing precision
If correction lenses are fixed with exact position relative to projection optics, then reproducible positioning is achieved, but the connection system becomes complex
Solution Approach 1:
The patent divides the connection system into distinct functional elements: the resilient lens holding frame, the connecting means on the HMD device, and the nose pad interface. This segmentation allows each component to be optimized independently - the frame provides precision positioning through its geometry, while the connection mechanism remains relatively simple through the stretching action between defined attachment points.
Solution Approach 2:
The resilient frame serves multiple functions simultaneously: it acts as the structural support for the lenses, provides the stretching mechanism for reversible attachment, ensures precise positioning through its geometry, and offers adjustable positioning capability. This multi-functionality reduces overall system complexity by eliminating the need for separate components for each function.
3Ease of operation
If lens holding frame is made of resilient material, then reversible connection is achieved, but material selection becomes more constrained
Solution Approach 1:
The patent specifies a tensile strength range of 400 to 700 N/mm² for the resilient material, which provides sufficient strength for the stretching connection while maintaining the necessary elasticity. This parameter specification guides material selection to materials like certain alloys of stainless steel or nickel-titanium that exhibit appropriate elastic behavior within this strength range, balancing manufacturability with functional requirements.
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 precise, repeatable, and adjustable placement of correction lenses relative to the HMD device's projection optics, providing a secure and stable connection without the need for magnetic devices, allowing for easy mounting and replacement.
Implementation Method 1
the lens holding frame is arranged to be stretched out of its original shape under a manual pressure to at least one transitional shape
Data Source
AI summary
A lens holding frame for holding lenses, both in front of the projection optics of an HMD device and in front of the eye portion of a wearer of the HMD device, the lens holding frame including a nose bridge, the HMD device including a nose pad arranged to support the nose bridge, and at least one correction lens. The lens holding frame is arranged to be stretched out of its original shape under a manual pressure to at least one transitional shape, and includes connecting elements arranged to connect in a reversible manner the HMD device to the lens holding frame being in a transitional shape and having its nose bridge supported by the nose pad of the HMD device.