VR Headset Eyepiece Rail Mechanism for Precise IPD Adjustment

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Solution Overview

Problem

Existing virtual and augmented reality headsets face challenges with fixed or complex interpupillary distance adjustments that lack precision and have limited motion ranges, often requiring cumbersome mechanical solutions.

Innovation Solution

A headset design featuring arcuate eyepieces movably coupled to linear rails with an adjustment mechanism, allowing for precise adjustment of interpupillary distance between 20 mm and 24 mm, using electro-mechanical or piezoelectric motors for controlled movement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If fixed eyepiece positioning is used, then device complexity is reduced, but adaptability to different users deteriorates

Engineering Contradiction:

Improveadaptability to different usersVSAvoiddevice complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent implements an adjustable interpupillary distance mechanism that allows the eyepieces to move dynamically between different positions. The frame includes a bridge with an adjustment mechanism that enables the distance between eyepieces to be changed while maintaining structural integrity, thus providing adaptability without excessive complexity

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The headset is divided into separable components including the bridge, arm members, and eyepieces. The adjustment mechanism is segmented into discrete adjustment positions that can be independently configured, allowing the system to adapt to different users while keeping each component relatively simple

Inventive Principle:

Principle #1Segmentation

2Ease of operation

If manual adjustment mechanism is used, then device complexity is reduced, but ease of operation deteriorates

Engineering Contradiction:

Improveease of adjustmentVSAvoidadjustment mechanism complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The adjustment mechanism is designed to be easily operable by the user without requiring external assistance or complex procedures. The mechanism allows users to independently adjust the interpupillary distance by simply manipulating the adjustment component, making the system self-service friendly

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent explores replacing traditional mechanical adjustment mechanisms with alternative actuation methods that reduce complexity. The adjustment mechanism may incorporate simplified mechanical linkages or alternative actuation systems that require minimal user effort while maintaining reliability

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentEP4321915B1Virtual or augmented reality headsets having adjustable interpupillary distance

Publication Date: 2026.05.13 MAGIC LEAP INC

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AI summary

A virtual or augmented reality headset (10) is provided having a frame (12), a pair of virtual or augmented reality eyepieces (30a, 30b), and an interpupillary distance adjustment mechanism (34). The frame (12) includes opposing arm members (14a, 14b), a bridge (16) positioned intermediate the opposing arm members (14a, 14b), and one or more linear rails (18a, 18b, 20a, 20b). The adjustment mechanism (34) is coupled to the virtual or augmented reality eyepieces (30a, 30b) and operable to simultaneously move the eyepieces in adjustment directions aligned with the plurality of linear rails (18a, 18b, 20a, 20b) to adjust the interpupillary distance of the eyepieces (30a, 30b).