Front Strap Adjustment for Head-Mounted Displays

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Solution Overview

Problem

Current head-mounted displays with adjustment mechanisms at the back of the head are difficult to adjust when lying down or sitting, as they can be pressed against surfaces, making it hard for users to manually adjust the fit.

Innovation Solution

A head-mounted display design with a strap that has overlapping ends and a handle portion at the front, allowing users to adjust the wearing space by moving the ends relative to each other using a follower mechanism, and a buckle assembly that can switch between locked and released states to control the adjustment process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the adjustment mechanism is disposed at the back of the user's head, then the strap can be adjusted for different head sizes, but the user cannot adjust it when lying on the bed or sitting on a chair because the mechanism is pressed against the surface

Engineering Contradiction:

ImproveadjustabilityVSAvoidadaptability to lying or sitting scenarios

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The patent inverts the conventional location of the adjustment mechanism from the back of the head to the front side. Specifically, the first end and second end of the strap are overlapped at the front side, and the handle portion is disposed at the first end or second end, allowing users to adjust the strap even when lying down or sitting by pressing the handle portion with their hand or foot.

Inventive Principle:

Principle #13The other way round (Inversion)

2Productivity

If the buckle assembly is in the released state, then the user can freely adjust the wearing space size, but the strap cannot maintain a fixed position during adjustment

Engineering Contradiction:

Improveadjustment efficiencyVSAvoidposition stability

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The buckle assembly is designed to be switchable between two states: buckled state and released state. In the released state, the first end can move relative to the wearing part for free adjustment; in the buckled state, the position is locked for stability. This dynamic state change allows the system to adapt to different operational requirements.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The follower mechanism is designed to guide the movement of the first end and second end during adjustment, ensuring controlled and smooth adjustment while preventing excessive or unintended movements even before the buckle is engaged.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Data Source

PatentUS11119329B2Head-mounted display

Publication Date: 2021.09.14 HTC CORP

AI summary

A head-mounted display includes a wearing part, a display body, a strap, a follower, and a buckle assembly. The display body is disposed on the wearing part. The strap includes a first end, a second end, and a handle portion. The wearing part is located at a front side of a wearing space surrounded by the strap. The first end and the second end are overlapped at the front side. The handle portion is located at the first end or the second end. The follower is disposed on the wearing part and coupled to the first end and the second end. The buckle assembly is disposed between the wearing part and the first end, and is adapted to lock a relative position between the wearing part and the first end in a buckled state and remove the interference between the wearing part and the first end in a released state.