Angled Diaphragm Balanced Armature Receiver for High Frequency Response
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Solution Overview
Problem
Balanced armature receivers face limitations in high frequency response due to the small sound port size, particularly in low profile designs, as the sound port is typically located on the end wall of the housing, restricting its size.
Innovation Solution
The diaphragm is oriented at an angle within the housing, allowing for a larger sound port on the end wall without increasing the receiver's height, achieved by using a hinged or pseudo-pistonic paddle configuration with a flexible membrane and an offset motor, enabling improved acoustic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the sound port is located on the end wall of the housing, then the receiver can maintain a low profile, but the sound port size is limited which restricts high frequency response
Solution Approach 1:
The sound port is repositioned from the end wall to the side wall of the housing, utilizing a different spatial dimension. This dimensional shift allows the sound port to be larger without increasing the receiver's height, as the side wall provides additional available area that does not conflict with the low-profile height constraint.
2Area of stationary object
If the sound port size is increased to improve high frequency response, then acoustic performance improves, but the receiver height increases which is not suitable for many applications
Solution Approach 1:
The sound port is repositioned from the end wall to the side wall of the housing, utilizing a different spatial dimension. This dimensional shift allows the sound port to be larger without increasing the receiver's height, as the side wall provides additional available area that does not conflict with the low-profile height constraint.
3Device complexity
If the paddle is oriented parallel to the ceiling, then the motor alignment is simplified, but the sound port area on the end wall is reduced
Solution Approach 1:
The paddle is oriented at an angle relative to the ceiling rather than parallel to it, creating an asymmetric configuration. This angular orientation optimizes the spatial arrangement to maximize the sound port area on the end wall while maintaining effective acoustic coupling between the paddle and the sound port.
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 configuration enhances the high frequency response by accommodating a larger sound port, providing better acoustic performance while maintaining a compact receiver design.
Implementation Method 1
A motor located in the back volume comprises a coil disposed about an armature a portion of which is movable between permanent magnets retained by a yoke when an electrical input signal is applied to the coil
Implementation Method 2
Movement of the diaphragm creates sound that emanates from a sound port coupled to the front volume of the housing
Data Source
AI summary
The present disclosure relates to a balanced armature receiver (100) including a housing having a diaphragm comprising a movable paddle (116) disposed in the housing and separating the housing into a back volume (112) and a front volume (110) defined partly by space between a ceiling of the housing and the diaphragm, wherein the paddle is oriented non-parallel to the ceiling. A sound port (142) in the housing acoustically couples the front volume to an exterior of the housing, wherein the sound port is located on an end wall between the diaphragm and the ceiling. A motor disposed in the back volume includes a coil magnetically coupled to an armature having an end portion movably disposed between magnets retained by a yoke and coupled to the paddle.