Behind-Ear Bone-Conduction Speaker Placement for Wearable Audio
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Solution Overview
Problem
Conventional head-mounted displays (HMDs) with bone-conduction speakers often suffer from suboptimal sound quality and aesthetic issues due to the placement of speakers, as they can be bulky and less discreet when positioned in front of the tragus, rather than behind the auricle.
Innovation Solution
A glasses-style support structure with a bone-conduction speaker attached to a moveable member that extends to the anterior of the side section, positioning the speaker posterior to the ear, providing higher sound quality and a more discreet, aesthetically desirable design by contacting the back of the auricle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the bone-conduction speaker is positioned in front of the tragus, then the speaker is easily accessible and structurally simple, but the sound quality is suboptimal and the device appears bulky and less discreet
Solution Approach 1:
The patent inverts the conventional placement location by moving the bone-conduction speaker from the traditional front-of-tragus position to a behind-auricle position. This inversion resolves the contradiction by achieving superior sound quality and aesthetic discretion while maintaining manufacturing feasibility through a straightforward extension of the side section structure.
Solution Approach 2:
The patent transitions the speaker placement from a two-dimensional front-facing position to a three-dimensional behind-auricle position. This dimensional change allows the speaker to contact the back of the auricle, providing better acoustic coupling with the bone structure while hiding the device from external view, thus improving both sound quality and aesthetic appearance.
2Device complexity
If the bone-conduction speaker is positioned in front of the tragus, then the device structure is simpler, but the aesthetic appearance is worse and less discreet
Solution Approach 1:
By inverting the conventional speaker placement location to behind the auricle, the patent achieves a more discreet and aesthetically desirable appearance. The speaker is hidden from external view while maintaining structural simplicity through the extension of the existing side section.
Solution Approach 2:
The patent extracts the speaker from the visible front-facing position and relocates it to a hidden behind-auricle position. This extraction removes the visual bulkiness from the external appearance while the speaker remains functionally integrated into the device structure.
3Reliability
If the member is extended to position the speaker behind the ear, then sound quality and aesthetics are improved, but the device length increases
Solution Approach 1:
The patent employs a moveable member that can extend and retract. When extended, it positions the speaker behind the auricle for optimal sound quality and aesthetics. When retracted, it minimizes the overall device length. This dynamic capability resolves the contradiction between achieving behind-ear placement and maintaining compact size.
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 placement of the bone-conduction speaker behind the auricle offers sound quality equal to or better than traditional front placement, while being more socially and aesthetically acceptable, enhancing user experience with improved sound fidelity and discretion.
Implementation Method 1
at least one bone-conduction speaker; wherein the member is arranged on the at least one side section such that when the glasses-style support structure is worn the member: (a) extends to the anterior of the at least one side section and (b) locates the bone-conduction speaker posterior to an ear
Data Source
AI summary
Apparatuses that provide a bone-conduction speaker arranged to be located behind the ear are described herein. An exemplary apparatus may include: (a) a glasses-style support structure comprising a front section and at least one side section; (b) at least one bone-conduction speaker; and (c) a member having a proximate end and a distal end, wherein the proximate end is attached to the at least one side section, and wherein the at least one bone-conduction speaker is attached to the member at or near the distal end; wherein the member is arranged on the at least one side section such that when the glasses-style support structure is worn the member: (a) extends to the anterior of the at least one side section and (b) locates the bone-conduction speaker posterior to an ear.