Housed Loudspeaker Array Using Flip-Chip Substrate
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Solution Overview
Problem
Existing loudspeaker arrays, particularly those using micro-electromechanical systems (MEMS), require a large number of connections to achieve sufficient sound pressure, which increases costs and complexity due to the need for bond wires and elaborate housing designs.
Innovation Solution
A housed loudspeaker array is manufactured using a flip-chip technology where a second substrate with orifices is aligned with loudspeaker elements on a first substrate, and a cover is applied, replacing bond wire connections with flip-chip connections and integrating audio signal distribution within the second substrate, which also serves as a support and housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a large number of connections are used to achieve sufficient sound pressure level, then the sound pressure level is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines multiple functions into the second substrate: it serves as both the housing structure and the signal distribution network. The second substrate integrates audio signal distribution traces that connect to multiple loudspeaker elements, eliminating the need for separate bond wires and connection structures. This merging reduces the overall number of connections while maintaining the ability to drive multiple speakers at high power levels.
Solution Approach 2:
The second substrate is designed as a multi-functional component that simultaneously provides structural support (housing), electrical signal distribution, and mechanical mounting for the loudspeaker elements. This universal component replaces what would traditionally require multiple separate parts (housing, circuit board, connection wires), thereby reducing device complexity while maintaining sound pressure level capability.
2Power
If bond wires and elaborate housing designs are used to connect loudspeaker elements, then sufficient sound pressure is achieved, but manufacturing cost and complexity increase
Solution Approach 1:
The housing and signal distribution function are merged into a single second substrate component. This eliminates the need for separate housing assembly and separate wiring processes, simplifying manufacturing. The substrate can be manufactured using standard PCB or semiconductor fabrication techniques, which are more cost-effective and scalable than traditional loudspeaker assembly methods involving bond wires and custom housing fabrication.
Solution Approach 2:
The patent replaces traditional mechanical connection methods (bond wires, manual wiring) with integrated trace-based electrical connections fabricated on the second substrate. This substitution enables automated manufacturing processes and reduces labor-intensive assembly steps, thereby lowering manufacturing cost while maintaining electrical connectivity for high power output.
3Power
If traditional loudspeaker design with large back volume is used, then low frequency sound is improved, but the device size increases
Solution Approach 1:
The patent divides the loudspeaker system into multiple independent loudspeaker elements (first substrate with multiple speakers) that can be arranged in an array. This segmentation allows the system to achieve sufficient low frequency sound pressure through the combined output of multiple smaller elements, eliminating the need for a single large back volume. Each element can have a compact design while the array collectively provides the required acoustic power.
Solution Approach 2:
Instead of increasing back volume in the vertical dimension, the patent distributes multiple loudspeaker elements across the horizontal plane (array configuration). This dimensional transition allows the system to achieve equivalent or superior low frequency sound pressure through spatial distribution of multiple sources, maintaining a compact overall device volume while preserving bass response capability.
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 approach reduces the number of connections needed, simplifies the manufacturing process, and provides a cost-effective and compact housing for the loudspeaker array while maintaining high sound pressure levels.
Implementation Method 1
a second substrate fixed at a first surface of the first substrate in a flip-chip manner and comprising a plurality of orifices that are aligned with the loudspeaker elements
Implementation Method 2
a cover comprising a deep-drawn film applied to a second surface of the first substrate opposite to the first surface
Implementation Method 3
A common design of a loudspeaker comprises a permanent magnet, a movable coil within a magnetic field produced by the permanent magnet, and a membrane attached to the movable coil. An alternating electric current flowing through the coil causes the coil to oscillate within the magnetic field, thus driving the membrane, which in turn produces a sound
Data Source
AI summary
A housed loudspeaker array includes a first substrate having a plurality of loudspeaker elements formed therein, a second substrate fixed at a first surface of the first substrate in a flip-chip manner and comprising a plurality of orifices that are aligned with the loudspeaker elements of the plurality of loudspeaker elements of the first substrate, and a cover applied to a second surface of the first substrate opposite to the first surface. A method for manufacturing the housed loudspeaker array is also disclosed.