Deep-Insertion Ear Tip With Rear Flange For Noise Seal
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Solution Overview
Problem
Standard ear tips often fail to provide a sufficient seal to block external noise while being comfortable enough for long-term use, particularly in deep-insertion sound devices like the QuietPro, where comfort and seal effectiveness conflict.
Innovation Solution
The design includes a foam body with a stem and a rear extension flange, featuring a concave opening, indentations, and a flexible stem made of elastomeric polyurethane, which improves insertion, comfort, and seal effectiveness by allowing inward deflection without increasing pressure, enabling long-wearing usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard ear tips are designed to provide a tight seal to block external noise, then seal effectiveness is improved, but comfort for long-term wear deteriorates
Solution Approach 1:
The ear tip is segmented into three distinct functional zones: a tapered nose portion for insertion, a cylindrical intermediate portion for seal formation, and a flared rear portion for comfort and stability. This segmentation allows each zone to be optimized independently - the nose provides effective insertion and sealing, while the flared rear portion distributes pressure to enhance comfort during extended wear.
Solution Approach 2:
Different portions of the ear tip are given different geometric qualities suited to their specific functions. The nose is tapered and angled for efficient insertion and initial seal, the intermediate section is cylindrical for maintaining consistent seal pressure, and the rear portion is flared with increased surface area for comfort and stability. This local differentiation resolves the contradiction by ensuring that seal-critical areas provide tight sealing while comfort-critical areas provide pressure distribution.
2Object-affected harmful factors
If ear tips are designed for deep insertion to improve seal in loud environments, then noise reduction is improved, but comfort deteriorates due to interaction with sensitive ear canal portions
Solution Approach 1:
The ear tip employs smooth curved transitions throughout its geometry, with a rounded nose, gradual tapering, and a flared rear portion that curves outward. These curved surfaces conform to the natural anatomy of the ear canal, distributing contact pressure along smoother pathways that avoid sensitive spots, thereby enabling deep insertion for effective noise sealing while maintaining comfort during extended wear in loud environments.
3Reliability
If ear tips use harder materials to maintain seal position, then seal stability is improved, but comfort deteriorates due to increased pressure on ear canal
Solution Approach 1:
The ear tip utilizes precise control of material hardness parameters and geometric dimensions. The foam material is formulated with specific durometer values (Shore A 15-30) that provide sufficient rigidity to maintain seal position and resist deformation, while the flared rear portion's increased surface area distributes the resulting contact pressure. This parameter optimization allows the seal to remain stable without concentrating excessive pressure on sensitive ear canal areas, resolving the contradiction between seal stability and comfort.
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
The ear tips provide an effective seal against external noise while maintaining comfort for extended periods, enhancing sound quality and noise reduction without compromising user experience.
Implementation Method 1
the foam body is made of polyurethane foam
Implementation Method 2
the stem is made of elastomeric polyurethane. The stem may be stiffer than the foam body and may have a durometer (hardness) range between about 65 and about 85 Shore A
Data Source
AI summary
Embodiments typically relate to ear tips for sound transmission devices, designed to fit snuggly in the user's ear canal and block external noise from the environment while being sufficiently comfortable for long-wearing and/or deep insertion. Embodiments may comprise a stem and a foam body, with the hollow stem lying on the centerline of the foam body. The foam body may comprise a concave opening in its nose, a rear extension flange projecting rearward to extend its length without significantly impacting perceived comfort, and/or a plurality of indentations about the periphery of the nose of the foam body. The foam body may be formed of polyurethane foam, and the stem may be formed of elastomeric polyurethane.