Detachable Headband Tracking Module for HMD Weight Distribution

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Solution Overview

Problem

Existing head-mounted display (HMD) devices, particularly those using augmented reality (AR) optical engines, are heavy and inefficient due to the integration of tracking feature modules, which can be uncomfortable for users and hinder immersive experiences.

Innovation Solution

Implementing a detachable head strap device with a tracking feature module that includes a simultaneous localization and mapping (SLAM) module, allowing the AR optical engine to remain compact in the HMD body while the tracking module is distributed in the head strap, enabling efficient weight distribution and versatile usage between training and AR modes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the tracking feature module is integrated into the HMD body, then the tracking functionality is achieved, but the HMD becomes heavy and uncomfortable for users

Engineering Contradiction:

Improvetracking functionalityVSAvoidHMD weight

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The tracking feature module is separated from the HMD body and integrated into the headband assembly instead. This segmentation allows the HMD body to remain lightweight while the tracking functionality resides in the headband, resolving the contradiction between maintaining tracking reliability and reducing HMD weight.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The tracking feature module is extracted from the HMD body and placed in the headband assembly. This extraction eliminates the need for the HMD body to carry the additional weight of the tracking module, thereby reducing overall HMD weight while preserving tracking functionality through the connection interface.

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If the tracking feature module is integrated into the HMD body, then the tracking functionality is achieved, but the HMD design becomes less versatile for different usage modes

Engineering Contradiction:

Improvetracking functionalityVSAvoidusage mode flexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

By segmenting the tracking feature module into a separate headband assembly that can be detached, the system gains versatility. The HMD body can be used independently for AR applications without tracking, while the headband assembly can be attached when tracking functionality is needed, allowing flexible adaptation between different usage modes.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The headband assembly with the tracking feature module is designed to be dynamically attachable and detachable from the HMD body through a connection interface. This dynamic configuration enables the system to adapt between training mode (with tracking) and AR mode (without tracking), enhancing versatility while maintaining reliable tracking functionality when required.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS11892647B2Head mountable device with tracking feature

Publication Date: 2024.02.06 HEWLETT PACKARD DEVELOPMENT COMPANY LP

AI summary

Various examples described herein relate to an HMD which comprises an HMD body positioned against a face of a user which includes an IMU to track user location data in an environment. The HMD also comprises a detachable headband assembly including a tracking feature module to construct a map of the environment based on the user location data. The HMD further includes a mechanical mount feature attaching the detachable headband assembly to the HMD body. The mechanical mount feature includes a connection interface to exchange the user location data between the IMU in the HMD body and the tracking feature module in the detachable headband assembly.