HMD Lens Recording Indicator for Tamper-Resistant Privacy Signaling
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Solution Overview
Problem
Conventional recording indicators for head-mounted devices (HMDs) can be easily disabled or masked, making it unclear to individuals in the environment whether they are being recorded, which raises privacy concerns.
Innovation Solution
Embedding a recording indicator light within the lens of the HMD, utilizing an optical stack with passive or active components that emit light, tint, or create a mirrored effect to indicate recording status, making it difficult to tamper with and visible to both the wearer and others.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional recording indicator is placed on the HMD, then it can indicate recording status, but it can be easily disabled or masked by taping or painting
Solution Approach 1:
The recording indicator is merged with the lens assembly by embedding the light source within the lens structure. This integration makes the indicator an inherent part of the lens, so that tampering with the indicator would require removing or damaging the lens itself, thereby significantly increasing tamper resistance while maintaining a relatively simple overall device structure.
2Illumination intensity
If the recording indicator light is made bright and visible, then it can be easily seen by persons in the environment, but it may interfere with the wearer's view through the lens
Solution Approach 1:
The light source is positioned and configured to emit light in a specific direction and location within the lens. The indicator light is directed toward the periphery of the lens where it is visible to persons in the environment, while the central viewing area remains clear for the wearer. This localized light emission achieves high visibility for outsiders without interfering with the wearer's view.
3Reliability
If the recording indicator is embedded in the lens, then it becomes difficult to tamper with, but it increases the complexity of lens manufacturing
Solution Approach 1:
The lens assembly is segmented into multiple functional layers or components, with the light source embedded within a specific layer or housing structure. This segmentation allows the light source to be integrated during the lens manufacturing process using standard assembly techniques, thereby achieving tamper resistance without significantly complicating the overall manufacturing process.
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
Provides a robust and noticeable recording indicator that cannot be easily disabled, ensuring individuals are aware of being recorded and the wearer is informed, while maintaining clear vision.
Implementation Method 1
a light source embedded in the lens; when the HMD's camera(s) are recording, the light is on
Implementation Method 2
an optical stack that provides a recording indicator light emitted from within a lens of the HMD
Implementation Method 3
an input coupler located between the light source and the waveguide; an output coupler located within the lens and between the waveguide and a surface of the lens
Implementation Method 4
active components that may generate a mirrored or tinted region of the HMD lens that is visible to persons within the field of view of the camera when in record mode
Data Source
AI summary
Recording indicators for head-mounted devices (HMDs) that provide protection from tampering so that the recording indicators cannot be easily disabled or masked. A recording indicator may be integrated in a lens of an HMD and may emit visible light from the lens into the environment when the camera is in record mode. The light is visible to persons within the field of view of the camera when in record mode. The recording indicator may emit a portion of the light towards the wearer's eye. Alternatively, instead of emitting light, a recording indicator may generate a mirrored or tinted region in the HMD lens that is visible to persons within the field of view of the camera when the camera is in record mode.