Loudspeaker Frame Reinforcement Using Bent Plate Geometry
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Solution Overview
Problem
Conventional loudspeakers do not achieve sufficient weight reduction while maintaining necessary stiffness, which is a requirement for improving fuel efficiency in automobiles.
Innovation Solution
A loudspeaker unit design featuring a frame with a support, a pedestal, and reinforcements that include plate-shaped portions with bent shapes protruding in both forward and rearward directions, which are fixed to the support and pedestal, enhancing stiffness without complicating the frame's shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the frame is reinforced by a reinforcement rib as in conventional loudspeakers, then the stiffness of the frame is improved, but the weight of the loudspeaker increases
Solution Approach 1:
The patent applies curvature to the reinforcement plate by forming it in a bent shape that protrudes in the forward direction. This curved geometry increases the stiffness of the frame structure without requiring additional material, thereby improving frame rigidity while avoiding weight increase. The curved surface distributes mechanical stresses more effectively compared to flat reinforcement ribs.
Solution Approach 2:
The reinforcement plate is configured to protrude in the forward direction, adding a third-dimensional element to the frame structure. This dimensional change creates a more rigid spatial configuration that resists deformation without requiring heavier materials. The protruding structure utilizes spatial geometry to enhance stiffness rather than relying on increased material mass.
2Weight of moving object
If the frame structure is simplified to reduce weight, then the weight of the loudspeaker is reduced, but the stiffness of the frame deteriorates
Solution Approach 1:
The bent shape of the reinforcement plate protruding in the forward direction provides structural stiffness through geometric curvature rather than material quantity. This allows the frame to maintain rigidity with minimal material usage, achieving weight reduction without sacrificing strength. The curved geometry acts as an efficient structural element that resists bending and deformation.
Solution Approach 2:
The reinforcement plate functions as a thin structural element that provides significant stiffness through its shaped configuration. Rather than using thick or heavy reinforcement ribs, the patent employs a thin plate formed into a protruding bent shape that delivers equivalent or superior structural performance with reduced mass.
3Strength
If reinforcement ribs are added to the frame, then the structural strength is improved, but the device complexity increases
Solution Approach 1:
The reinforcement plate is integrated into the frame structure as a unified component rather than being added as a separate reinforcement rib. This merging of the reinforcement function into the existing frame geometry simplifies the overall structure by eliminating the need for additional discrete reinforcement elements and their associated assembly steps.
Solution Approach 2:
The bent shape of the reinforcement plate is formed as an integral part of the frame structure, utilizing curved geometry to provide strength without requiring complex assembly of multiple rigid reinforcement pieces. The continuous curved form simplifies manufacturing compared to assembling multiple straight reinforcement ribs.
Data Source
AI summary
A loudspeaker unit includes a frame that supports a diaphragm and a magnetic circuit. The frame includes: a first support supporting a perimeter of the diaphragm; a pedestal extending outwardly from a perimeter of the first support; fastening portions provided in positions on the pedestal that surround the perimeter of the first support; and reinforcements disposed in regions of the pedestal between the fastening portions, and fixed to the first support and the pedestal. The reinforcements include: a first plate portion that is a plate-shaped portion disposed in front of the pedestal to face the pedestal, and has a bent shape that protrudes in the forward direction; and a second plate portion that is a plate-shaped portion disposed in front of the pedestal to face the pedestal and the first plate portion, and has a bent shape that protrudes in a rearward direction.