Headset Securement Strap With Load Spreaders for Pressure Relief

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Solution Overview

Problem

Existing securement straps for head-mountable devices, such as AR/VR devices, cause discomfort and pain due to uneven pressure concentrations on the user's head during extended use, as they exert force primarily on the front and rear of the head, concentrating pressure and leading to discomfort.

Innovation Solution

The use of load spreaders integrated into the securement band that distribute the pressure more evenly across the sides of the user's head, using rigid load spreaders connected by variable length straps with elastic material, allowing for adjustable fit and distribution of weight from the display component.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a securement strap exerts force inward against the user's head to secure the display, then the display is securely positioned in front of the user's eyes, but uneven pressure concentrations are created on the front and rear of the user's head causing discomfort during extended use

Engineering Contradiction:

Improvedisplay positioning stabilityVSAvoidpressure concentration discomfort

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The securement strap is divided into multiple segments including rigid load spreaders and elastic portions, allowing the force to be distributed across different regions of the head rather than concentrated at single points. The load spreaders act as separate structural elements that broaden the contact area.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different portions of the securement strap have different mechanical properties - rigid load spreaders provide structural support and force distribution at critical contact points, while elastic portions provide flexibility and comfort. The concave curved surfaces of the load spreaders are specifically designed to match the local geometry of the head.

Inventive Principle:

Principle #3Local quality

2Reliability

If the securement strap exerts sufficient force to press the display against the user's face, then the display remains securely positioned during movement, but the force becomes uncomfortable during extended use

Engineering Contradiction:

Improvedisplay position maintenanceVSAvoidextended wear comfort

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The concave curved surfaces of the rigid load spreaders are pre-shaped to match the contours of the user's head, creating a cushioning effect that distributes pressure before it becomes concentrated. This geometric cushioning is built into the structure rather than added as a separate element.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The securement strap combines rigid materials for the load spreaders with elastic materials for the connecting portions, creating a composite structure that provides both the necessary securing force and the comfort for extended wear. The rigid-elastic combination allows force transmission while accommodating head movement and shape variations.

Inventive Principle:

Principle #40Composite materials

3Strength

If the securement strap creates uneven pressure concentrations to secure the device, then the display is firmly held, but pain and discomfort are exacerbated during prolonged use

Engineering Contradiction:

Improvesecuring forceVSAvoidpressure-induced pain

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The load spreaders extend the contact area from point contacts to surface contacts by adding spatial dimension to the interaction between the strap and head. The concave curved surfaces create multi-dimensional contact zones that distribute force across larger areas of the head.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The rigid load spreaders act as intermediary elements between the elastic strap and the user's head, transforming the concentrated force from the strap into distributed pressure across the head surface. The load spreaders mediate the force transmission while protecting the user from direct concentrated pressure.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 effectively reduces pressure concentrations on the front and rear of the head, distributing the load more evenly, allowing users to wear head-mountable devices for extended periods without discomfort or pain.

Implementation Method 1

The variable length strap can include elastic material and the first and second load spreaders can be rigid.

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS12601924B2Electronic device securement strap

Publication Date: 2026.04.14 APPLE INC

AI summary

A securement band for a head-mountable device can include a variable length strap, a first load spreader connected to the variable length strap, and a second load spreader connected to and separated from the first load spreader by the variable length strap. The first and second load spreaders can be fixed in length. The variable length strap can include elastic material and the first and second load spreaders can be rigid.