Flat-Plate Speaker for Electronic Keyboard
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Solution Overview
Problem
Conventional electronic keyboard instruments with electrostatic surface speakers require a dedicated power supply for bias voltage, increasing product costs due to the need for additional components and reducing the freedom of speaker attachment in limited spaces.
Innovation Solution
The use of flat-plate speakers with a vibrating membrane and magnet plates driven by an electromagnetic force, eliminating the need for bias voltage and allowing for improved speaker attachment flexibility without increasing product costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an electrostatic surface speaker is used to improve speaker attachment freedom in limited space, then the freedom degree of attachment is improved, but the product cost increases due to the requirement of a dedicated power supply system for bias voltage
Solution Approach 1:
The patent replaces the electrostatic speaker mechanism with a voice coil driver mechanism. Instead of using electrostatic fields requiring complex power supply systems, the invention employs electromagnetic forces generated by a voice coil and magnet assembly, which can be driven by standard audio signals without requiring dedicated bias voltage power supply circuits.
Solution Approach 2:
The patent adopts a simpler, more cost-effective voice coil driver design that eliminates the need for expensive electrostatic power supply systems. The voice coil driver uses conventional components that can be powered by standard audio amplifiers, significantly reducing the overall cost of the electronic keyboard instrument while maintaining speaker attachment flexibility.
2Device complexity
If a voice coil driver is used instead of electrostatic speaker, then the product cost is reduced by eliminating dedicated power supply, but the speaker thickness increases
Solution Approach 1:
The patent optimizes the voice coil driver design by arranging components in a compact three-dimensional configuration. The magnet assembly and voice coil are positioned to maximize electromagnetic efficiency within a limited thickness, using vertical stacking and radial arrangements to achieve adequate speaker output without excessive thickness increase.
Solution Approach 2:
The patent employs composite material structures in the speaker assembly, combining different magnetic materials, voice coil wire types, and diaphragm materials to achieve optimal performance within constrained dimensions. The magnet assembly uses composite magnetic structures that provide sufficient magnetic field strength while minimizing overall thickness.
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 configuration enables effective sound output with high directionality, reducing product costs and enhancing the freedom of speaker placement within the instrument's housing while maintaining sound quality.
Implementation Method 1
a flat-plate speaker that includes a vibrating membrane on which a pattern of a conducting wire is formed and a pair of magnet plates disposed facing both surfaces of the vibrating membrane, and the flat-plate speaker vibrates the vibrating membrane with an electromagnetic force accompanying energization of the conducting wire
Data Source
AI summary
Provided is an electronic keyboard instrument and sound releasing method thereof. The electronic keyboard instrument includes: a plurality of keys, a housing that supports the plurality of keys, and one or more speakers arranged in the housing. At least one of the speakers is configured as a flat-plate speaker that includes a vibrating membrane on which a pattern of a conducting wire is formed and a pair of magnet plates disposed facing both surfaces of the vibrating membrane, and the flat-plate speaker vibrates the vibrating membrane with an electromagnetic force accompanying energization of the conducting wire.