Reversibly Mounted Loudspeaker Membrane for Continuous Exterior

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Solution Overview

Problem

Existing speakers have a discontinuous and unsightly appearance due to the need for a cache to mask the opening defined by the membrane for fixing screws, which compromises the aesthetic appeal and smoothness of the speaker's exterior.

Innovation Solution

The speaker design incorporates a membrane that is reversibly mounted and screwed onto a bonding system, eliminating the need for a cache and allowing the membrane to form a continuous screen between the exterior and the magnetic circuit, thus maintaining a smooth and continuous external appearance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a mounting screw passes axially through the magnetic circuit with the head located on the diaphragm side, then the speaker can be securely fixed to the enclosure, but an opening is created in the diaphragm that requires a cache cover, compromising the aesthetic appearance

Engineering Contradiction:

Improvefixing reliabilityVSAvoidexternal appearance continuity

Core Design Contradiction:

ReliabilityVSShape

Solution Approach 1:

Instead of passing the screw through the magnetic circuit from the diaphragm side (conventional approach), the invention inverts the approach by passing the screw from the rear side through the magnetic circuit to the front, allowing the diaphragm to cover the screw head and create a continuous appearance

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The diaphragm itself serves as an intermediary element that simultaneously performs its acoustic function and acts as a cover for the mounting screw, eliminating the need for a separate cache cover and maintaining aesthetic continuity

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the membrane is securely fixed to the linking system using glue, then poor contact and disruptive vibrations are avoided, but the assembly process becomes more complex and time-consuming

Engineering Contradiction:

Improvecontact reliabilityVSAvoidassembly simplicity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The invention replaces the chemical bonding method (glue) with a mechanical fastening system using a screw that passes through the linking system and secures the membrane, providing reliable contact while simplifying the assembly process through a single mechanical operation

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention changes the bonding mechanism from chemical (adhesive) to mechanical (threaded fastening), fundamentally altering the attachment parameter from molecular adhesion to physical interlocking, which maintains reliability while improving manufacturability

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP4125085B1Loudspeaker comprising a reversibly mounted membrane, and acoustic enclosure incorporating such a loudspeaker

Publication Date: 2025.04.23 DEVIALET

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AI summary

A loudspeaker (16) comprising: - a magnetic circuit (26) defining at least one air gap (28), - a moving assembly (30) comprising a voice coil holder (36), a voice coil (38) located in the air gap, a diaphragm (40) adapted to emit sound waves, and a linkage system (42) connecting the diaphragm and the voice coil holder. The diaphragm is reversibly movable relative to the linkage system between an assembled position, in which the diaphragm is fixed to the linkage system, and a disassembled position, in which the diaphragm is separate from the linkage system. In the assembled position, the diaphragm forms a screen between the exterior of the loudspeaker and the magnetic circuit. A corresponding method, and a loudspeaker enclosure incorporating such a loudspeaker.