Head-Mounted Optical Assembly for Interference and Leakage Control

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing optical apparatuses suffer from interference of interference light entering the user's eye and leakage of image light to the external environment, leading to poor imaging quality and privacy concerns.

Innovation Solution

An optical apparatus comprising an image assembly, a first optical assembly, a second optical assembly, and a third optical assembly, where the second assembly blocks interference light from entering the eye and the third assembly blocks image light from leaking externally, utilizing polarization characteristics to manage light states.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the optical apparatus allows light to pass through the third optical assembly, then the image light can reach the user's eye, but the image light leaks to the external environment causing privacy issues

Engineering Contradiction:

Improveimage light transmission to user's eyeVSAvoidimage light leakage to external environment

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The optical path is divided into multiple segments with different optical assemblies performing different functions. The third optical assembly is specifically designed to reflect image light back to the user's eye while blocking transmission to the external environment, effectively segmenting the light path to prevent privacy leakage.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The third optical assembly acts as an intermediary element between the image light source and the external environment. It mediates the light path by reflecting image light to the user's eye while blocking direct transmission to the external environment, thus preventing privacy issues.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Illumination intensity

If the optical apparatus allows ambient light to pass through the second optical assembly, then the user can see the real scene, but interference light enters the user's eye degrading image quality

Engineering Contradiction:

Improveambient light transmission for real scene visibilityVSAvoidinterference light entering user's eye

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The second optical assembly is designed with specific optical properties that allow it to treat different light paths differently. It transmits ambient light from the real scene to the user's eye while blocking interference light from entering the user's eye, providing local quality control for different light sources.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The optical apparatus utilizes polarization parameter changes to differentiate between image light and interference light. By controlling the polarization state of light passing through the second optical assembly, the system allows ambient light to pass while blocking interference light based on their different polarization characteristics.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the optical apparatus uses multiple optical assemblies to block interference light and prevent leakage, then imaging quality and privacy are improved, but the device complexity increases

Engineering Contradiction:

Improveimaging quality and privacy protectionVSAvoidnumber of optical assemblies

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

Each optical assembly in the system is designed to perform multiple functions. For example, the second optical assembly both transmits ambient light for real scene visibility and blocks interference light, while the third optical assembly both reflects image light to the user's eye and blocks leakage to the external environment. This multi-functionality reduces the need for additional separate components.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

Improves imaging quality by preventing interference light from entering the eye and protects user privacy by blocking image light leakage, enhancing user experience.

Implementation Method 1

utilizing polarization characteristics to manage light states

Methodology Applied

Scientific EffectPolarization: Polarisation

Implementation Method 2

utilizing polarization characteristics to manage light states

Methodology Applied

Scientific EffectPolarization: Polarisation

Data Source

PatentEP4130851B1Optical apparatus and head-mounted device

Publication Date: 2025.10.01 BEIJING UNICORN TECH CO LTD

Figure 1A~1B(2)
Figure 1C~1E
Figure 2A

AI summary

Embodiments of this specification provide an optical apparatus and a head-mounted device. The optical apparatus may include an image assembly, a first optical assembly, a second optical assembly, and a third optical assembly, the image assembly is configured to emit image light. The image assembly, the first optical assembly, the second optical assembly, and the third optical assembly are configured to enable that the image light is transmitted through the first optical assembly to the second optical assembly, then reflected through the second optical assembly to the third optical assembly, then reflected through the third optical assembly back to the second optical assembly and transmitted through the second optical assembly into a user's eye. The second optical assembly is configured to block interference light incident on the second optical assembly from entering the user's eye. The third optical assembly is configured to block the image light from being transmitted through the third optical assembly to enter an external environment.