IR-Transparent Eyewear Frame for Unobstructed Gesture Tracking

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Solution Overview

Problem

Conventional eyewear devices, such as smart glasses, block infrared wavelengths of light, obstructing the functionality of infrared cameras and emitters, which are essential for features like hand gesture detection and eye tracking.

Innovation Solution

The eyewear device is designed with a frame made of an infrared (IR) transmissive material, allowing IR cameras to be positioned behind optical surfaces angled inwardly to capture images without obstructions, and uses IR transparent plastic with UV hard coat and anti-smudge coatings to maintain image quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional eyewear frames are used, then structural integrity and visibility are maintained, but infrared light transmission is blocked, preventing IR camera functionality

Engineering Contradiction:

ImproveIR camera functionalityVSAvoidIR light blocking

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The frame is constructed with regions of different material properties: IR-transmissive portions (temple arms and bridge) allow infrared light transmission, while other portions maintain conventional properties. This local differentiation enables the frame to simultaneously provide structural integrity and permit IR light transmission to cameras positioned at specific locations.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The frame employs composite construction combining materials with different optical properties. The IR-transmissive portions use materials that are transparent to infrared wavelengths while maintaining mechanical strength, creating a composite structure that balances optical functionality with structural requirements.

Inventive Principle:

Principle #40Composite materials

2Adaptability or versatility

If optical surfaces are angled inwardly to capture images, then hand gesture detection and eye tracking are enabled, but the optical surfaces become more susceptible to scratches and smudges

Engineering Contradiction:

Improvegesture detection capabilityVSAvoidsurface contamination

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

Anti-smudge coatings are applied to the optical surfaces before use to prevent contamination. These coatings create a protective layer that repels oils and reduces the adhesion of particulates, proactively counteracting the contamination problem that arises from the angled surface configuration.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The optical surfaces undergo surface treatment modifications that change their physical and chemical properties. Coatings are applied that alter surface energy, roughness, and chemical composition to reduce smudge formation and make the surfaces more resistant to contamination while maintaining optical clarity.

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If UV hard coat and anti-smudge coatings are applied to maintain image quality, then IR imaging quality is improved, but manufacturing complexity increases

Engineering Contradiction:

Improveoptical surface qualityVSAvoidcoating process complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

Multiple protective functions are combined into integrated coating layers. The UV hard coat and anti-smudge coatings are applied in a coordinated sequence to create a multi-functional protective system that simultaneously provides hardness, scratch resistance, and smudge resistance, reducing the need for separate treatment processes.

Inventive Principle:

Principle #5Merging (Combining)

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 effective hand gesture detection and eye tracking by ensuring high-quality IR imaging without scratches or smudges, enhancing user experience and functionality.

Implementation Method 1

an infrared (IR) transmissive material, allowing IR cameras to be positioned behind optical surfaces angled inwardly to capture images without obstructions

Methodology Applied

Scientific EffectInfrared transmission: Absorption (EM radiation)

Implementation Method 2

uses IR transparent plastic with UV hard coat and anti-smudge coatings to maintain image quality

Methodology Applied

Scientific EffectCoating protection: Coatings

Data Source

PatentUS12535697B1Eyewear with IR transparent frame

Publication Date: 2026.01.27 SNAP INC

AI summary

An eyewear device having a frame formed of an infrared (IR) transmissive material in a continuous piece without discrete openings. IR cameras are placed behind areas of the frame designated as optical surfaces. In an example, the optical surfaces are positioned at lower corners of the frame and are angled inwardly to prevent obstructions, e.g., due to scratches and smudges. The optical surfaces have uniform thickness, are smooth, and are angled such that IR light communicated to the cameras pass at an angle through the optical surfaces. The IR cameras are angled downwardly to view objects forward and below a user wearing the eyewear device, e.g., to detect hand gestures.