Speaker Diaphragm Reinforcement for Standing Wave Suppression
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Solution Overview
Problem
Existing speaker diaphragms face challenges such as standing wave occurrence, increased manufacturing costs, and compromised sound field expression due to material limitations and manufacturing complexities, particularly with wood cone and oblique cone types, and surface modification methods that damage materials.
Innovation Solution
A speaker design utilizing an isotropic diaphragm with radially arranged reinforcement portions made of materials like paper, plastics, or metal, which are pressed to have higher density and Young's modulus, reducing standing wave occurrence and enhancing sound propagation, thereby improving sound field expression and manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a wood cone type diaphragm is used to suppress standing waves, then standing wave occurrence is reduced, but manufacturing cost increases and manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by creating reinforcement portions with different density and elastic modulus only in specific regions of the diaphragm. These reinforcement portions are formed by applying a coating material to predetermined regions and drying it to form a hardened layer, thereby locally modifying the diaphragm structure to suppress standing waves without requiring complete replacement with expensive wood cone materials throughout the entire diaphragm.
Solution Approach 2:
The patent uses composite materials by combining a base diaphragm material (paper, plastic, or metal) with a coating material that forms a hardened layer upon drying. This composite structure provides the benefits of wood cone diaphragms (standing wave suppression) while maintaining the manufacturing advantages of processed materials, as the coating material and base material work together to achieve the desired acoustic properties.
2Object-generated harmful factors
If a wood cone type diaphragm is used to suppress standing waves, then standing wave occurrence is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by creating reinforcement portions with different density and elastic modulus only in specific regions of the diaphragm. These reinforcement portions are formed by applying a coating material to predetermined regions and drying it to form a hardened layer, thereby locally modifying the diaphragm structure to suppress standing waves without requiring complete replacement with expensive wood cone materials throughout the entire diaphragm.
Solution Approach 2:
The patent replaces the complex mechanical manufacturing process of wood cone diaphragms with a simpler coating and drying process. Instead of mechanically forming the entire diaphragm from wood cones, the invention applies a coating material that hardens upon drying, substituting a complex mechanical manufacturing system with a simpler chemical/physical drying process.
3Object-generated harmful factors
If an oblique cone type diaphragm is used, then standing wave occurrence is reduced, but directivity becomes biased and sound field expression deteriorates
Solution Approach 1:
The patent applies local quality by creating reinforcement portions with different density and elastic modulus only in specific regions of the diaphragm. These reinforcement portions are formed by applying a coating material to predetermined regions and drying it to form a hardened layer, thereby locally modifying the diaphragm structure to suppress standing waves without requiring complete replacement with expensive wood cone materials throughout the entire diaphragm.
Solution Approach 2:
The patent uses asymmetry by positioning the voice coil and magnet assembly off-center relative to the diaphragm. This asymmetric arrangement creates the oblique cone effect needed to suppress standing waves while maintaining proper sound projection directionality, avoiding the biased directivity problem of conventional oblique cone designs.
4Object-generated harmful factors
If a laser beam is irradiated onto the diaphragm surface to modify material propagation speed, then anisotropy is imparted to suppress standing waves, but the modified portion becomes fragile and product malfunction occurs
Solution Approach 1:
The patent applies local quality by creating reinforcement portions with different density and elastic modulus only in specific regions of the diaphragm. These reinforcement portions are formed by applying a coating material to predetermined regions and drying it to form a hardened layer, thereby locally modifying the diaphragm structure to suppress standing waves without requiring complete replacement with expensive wood cone materials throughout the entire diaphragm.
Solution Approach 2:
The patent replaces the complex mechanical manufacturing process of wood cone diaphragms with a simpler coating and drying process. Instead of mechanically forming the entire diaphragm from wood cones, the invention applies a coating material that hardens upon drying, substituting a complex mechanical manufacturing system with a simpler chemical/physical drying process.
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 solution effectively suppresses standing waves, enhances midrange sound quality, and provides a more forward sound impression with improved directional sensitivity and sound pressure levels, while maintaining material integrity and reducing manufacturing costs.
Implementation Method 1
a cross section of which has a conical shape; and a plurality of band-like reinforcement portions (13a to 13d) which are radially arranged on the vibration member (10), each of the reinforcement portions (13a to 13d) being pressed to have a higher density and a higher Young's modulus than those of a standard portion (12)
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3~4
AI summary
A diaphragm 1 includes a vibration member 10 including a first-region and second-region portions formed integrally with each other by using an isotropic material. The vibration member 10 has, in the first-region portion, reinforcement portions 13a to 13d in which a Young's modulus is higher than in the second-region portion. The reinforcement portions 13a to 13d are obtained by press molding in which a pressure applied to the first-region portion is stronger than a pressure applied to the second-region portion.