Rectangular Microspeaker Side Sound Discharge
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Solution Overview
Problem
Circular microspeakers have a limited effective vibration area, restricting their performance and sound quality, while conventional rectangular microspeakers have not been commercialized for earphones due to design limitations.
Innovation Solution
A hybrid acoustic apparatus featuring a rectangular microspeaker with a diaphragm that discharges vibration sound perpendicular to its vibration direction, integrated with another acoustic device such as a balanced armature or microphone, to maximize effective vibration area and sound quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a circular microspeaker is used, then the product size is reduced and insertion is facilitated, but the effective vibration area is limited
Solution Approach 1:
The patent transitions from a circular diaphragm to a rectangular diaphragm shape. This asymmetric change allows the effective vibration area to be increased by approximately 29% compared to circular designs, while the rectangular frame and housing maintain compact dimensions suitable for portable devices.
Solution Approach 2:
The patent introduces a new dimension by discharging vibration sound through the side surface of the diaphragm rather than only through the top. This perpendicular discharge path (perpendicular to the vibration direction) utilizes the side surface area of the rectangular diaphragm, effectively increasing the sound discharge area without increasing the front projection area.
2Area of moving object
If a rectangular microspeaker is used, then the effective vibration area is maximized, but the design complexity increases
Solution Approach 1:
The plate in the magnetic field assembly serves multiple functions: it provides magnetic flux return path, structural support for the rectangular diaphragm, and defines the rectangular geometry. This multi-functionality reduces the need for separate components, thereby managing design complexity while achieving rectangular configuration.
Solution Approach 2:
The patent integrates the sound discharge function with the side surface of the rectangular diaphragm itself, rather than requiring separate discharge channels or housings. The frame structure simultaneously provides mechanical support and defines the sound discharge path, merging multiple functions into unified components.
3Area of moving object
If sound discharge path coincides with vibration direction, then the structure is simple, but the effective sound discharge area is limited
Solution Approach 1:
The patent changes the sound discharge direction from the traditional topward path (coincident with vibration direction) to a sideward path perpendicular to the vibration direction. This utilizes the side surface of the rectangular diaphragm as a new discharge dimension, effectively increasing the discharge area without complicating the overall structure.
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 rectangular design increases the effective vibration area by approximately 29% and enhances sound pressure, particularly in the audible frequency range, while maintaining stable magnetic flux density, enabling improved sound reproduction and a distinctive tone.
Implementation Method 1
a plate configured to constitute a part of a magnetic field part, a magnet configured to be disposed beneath the plate
Implementation Method 2
a diaphragm configured to be disposed on the plate... a path of vibration sound generated by the diaphragm
Data Source
AI summary
Disclosed herein is a hybrid acoustic apparatus. The hybrid acoustic apparatus includes: a rectangular microspeaker used as a first acoustic device; and a second acoustic device integrated with the microspeaker. The microspeaker includes a plate configured to constitute a part of a magnetic field part, a magnet configured to be disposed beneath the plate, a diaphragm configured to be disposed on the plate, and a frame configured to accommodate the diaphragm, the plate, and the magnet. A path of vibration sound generated by the diaphragm is formed to be perpendicular to a direction in which the diaphragm vibrates so that the vibration sound is discharged through a side surface of the diaphragm.