Dual-Frame Loudspeaker Basket for High-Power Support

Solution Overview

Problem

Existing loudspeaker baskets struggle to support the increased weight and stress of high power transducers without adding excessive weight or cost, as simple stamped steel frames distort under the weight of larger magnetic structures.

Innovation Solution

A dual-frame basket design comprising a main frame and a support frame, where the support frame is positioned inside the main frame to provide additional structural support, preventing distortion and maintaining the integrity of the magnetic gap.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If the surface area of the voice coil is increased to increase power handling, then the power handling capability is improved, but the mass of the permanent magnetic circuit increases

Engineering Contradiction:

Improvepower handling capabilityVSAvoidmass of permanent magnetic circuit

Core Design Contradiction:

PowerVSWeight of stationary object

Solution Approach 1:

The basket is divided into two separate frames: a first frame that couples to the permanent magnetic circuit and a second frame that provides additional support. This segmentation allows each frame to be optimized for its specific function while working together to support the increased weight of high-power transducers.

Inventive Principle:

Principle #1Segmentation

2Power

If the mass of the permanent magnetic circuit is increased to support high power transducers, then the power handling is improved, but the stress on the basket increases

Engineering Contradiction:

Improvepower handlingVSAvoidstress on basket

Core Design Contradiction:

PowerVSStress or pressure

Solution Approach 1:

The basket is divided into two separate frames: a first frame that couples to the permanent magnetic circuit and a second frame that provides additional support. This segmentation allows each frame to be optimized for its specific function while working together to support the increased weight of high-power transducers.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The second frame is positioned inside the first frame, creating a nested structure where the inner frame is housed within the outer frame. This nested configuration provides additional structural support while maintaining a compact overall structure and distributing the stress from the permanent magnetic circuit.

Inventive Principle:

Principle #7Nested doll (Nesting)

3Device complexity

If a single frame structure is used for the basket, then the device complexity is reduced, but the structural integrity under high stress deteriorates

Engineering Contradiction:

Improvebasket structure complexityVSAvoidstructural integrity

Core Design Contradiction:

Device complexityVSStrength

Solution Approach 1:

The basket is divided into two separate frames: a first frame that couples to the permanent magnetic circuit and a second frame that provides additional support. This segmentation allows each frame to be optimized for its specific function while working together to support the increased weight of high-power transducers.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The second frame is positioned inside the first frame, creating a nested structure where the inner frame is housed within the outer frame. This nested configuration provides additional structural support while maintaining a compact overall structure and distributing the stress from the permanent magnetic circuit.

Inventive Principle:

Principle #7Nested doll (Nesting)

Data Source

PatentEP4615004A1Loudspeaker and basket thereof

Publication Date: 2025.09.10 ROBERT BOSCH GMBH

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AI summary

A loudspeaker including a speaker basket. The speaker basket includes a first frame including an inner surface and an outer surface opposite the inner surface, and a second frame housed in the first frame. The second frame includes a first wall and a second wall, wherein the first wall and the second wall of the second frame engage the inner surface of the first frame.