Optical Sensor Shielding in Receiver-in-Ear Hearing Devices
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Solution Overview
Problem
Receiver-in-canal hearing aids lack integrated optical sensors due to manufacturing challenges in miniaturizing these sensors for the harsh ear environment, and existing sensors have reduced efficacy due to difficulties in properly channeling or amplifying light beams within the ear.
Innovation Solution
A hearing device design incorporating a housing with a cavity and an optical transducer mounted on a circuit board, where a protective substance forms a shield over the transducer to affect its field of view and hermetically seal the assembly, utilizing reflective surfaces and a Fresnel lens to enhance light emission and detection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an optical sensor is provided on a receiver-in-ear assembly, then physiological parameters can be monitored, but the efficacy is reduced because light beams cannot be properly channeled or amplified
Solution Approach 1:
A reflective surface is introduced as an intermediary element between the optical transducer and the ear canal. This reflector channels and amplifies light beams emitted by the transducer, directing them toward the ear canal wall to improve measurement precision without requiring complex optical systems
Solution Approach 2:
The optical transducer is mounted on the sidewall of the housing rather than the bottom, utilizing the lateral dimension of the housing structure. This positioning allows the transducer to face the ear canal wall directly, improving light channeling efficiency while maintaining a compact form factor
2Measurement precision
If LED or detector with optical amplifier is used, then light beam channeling is improved, but the form factor becomes larger
Solution Approach 1:
A simple reflective surface serves as an optical amplifier intermediary, replacing the need for bulky optical amplifiers. The reflector utilizes the housing sidewall structure to channel and amplify light beams, achieving improved measurement precision while maintaining a compact sensor form factor
Solution Approach 2:
The housing sidewall serves multiple functions: it provides structural support, houses the optical transducer mounting, and acts as a reflective surface for light channeling. This multi-functionality eliminates the need for separate optical amplifier components, reducing overall form factor
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
This design enables effective embedding of optical sensors within receiver-in-canal assemblies, improving their efficacy by properly channeling and amplifying light beams, allowing for continuous monitoring of physiological parameters like heart rate and blood pressure.
Implementation Method 1
utilizing reflective surfaces and a Fresnel lens to enhance light emission and detection efficiency
Implementation Method 2
utilizing reflective surfaces and a Fresnel lens to enhance light emission and detection efficiency
Data Source
AI summary
A hearing device such as a receiver-in-ear assembly. The assembly includes a housing having a cavity extending through the housing; an optical transducer mounted in the cavity within a thickness of the housing, the optical transducer being mounted on a circuit board layer such that a spacing exists between a side of the optical transducer and a sidewall of the cavity. The circuit board layer extends underneath the housing and touching the housing such that the optical transducer is held within the cavity without touching the housing. The assembly further includes a protective substance forming a shield over the optical transducer and the cavity, the protective substance configured to affect a field of view of the optical transducer.