Adjustable Voice Coil Actuator for Musical Instrument Soundboard
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Solution Overview
Problem
Existing voice coil type actuators for vibrating sound boards in electronic pianos require complex and cumbersome mounting processes due to the need for precise alignment of the bobbin and magnetic path formation sections, which complicates the attachment and positioning of the actuator.
Innovation Solution
A voice coil type actuator design featuring a magnetic path formation section, a bobbin with a voice coil, and an adjustable connection member that connects to the sound board, allowing for easy adjustment of the actuator's position without moving the magnetic path formation section or bobbin, thereby simplifying the attachment process and maintaining the required positional relationship.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the dimension of the voice coil in the vibrating direction is increased to reduce variation in coil winding turns, then stable drive force is improved, but inductance increases and responsiveness at high frequencies deteriorates
Solution Approach 1:
The patent makes the connection member adjustable in length, allowing the system to dynamically adapt the voice coil dimension. By adjusting the connection member length, the voice coil dimension can be increased for stable drive force while maintaining the ability to optimize for responsiveness when needed
Solution Approach 2:
The patent changes the parameter of connection member length to resolve the contradiction. By making this parameter adjustable, the system can optimize between stable drive force (longer connection member) and responsiveness (shorter connection member) based on specific operational requirements
2Reliability
If the bobbin and magnetic path formation section are independently mounted requiring precise alignment, then stable drive force is improved, but the mounting process becomes complex and cumbersome
Solution Approach 1:
The patent merges the bobbin and magnetic path formation section into a single integrated unit. This integration maintains the precise alignment needed for stable drive force while eliminating the complex independent mounting and alignment process
Solution Approach 2:
The patent performs the alignment action in advance by integrating the components during manufacturing. The precise positional relationship is established beforehand, eliminating the need for complex alignment operations during installation
3Reliability
If the bobbin and yokes are mounted separately requiring fine adjustment to prevent contact, then proper magnetic path formation is improved, but the mounting operation becomes cumbersome and complicated
Solution Approach 1:
The patent combines the bobbin and magnetic path formation section into one unit, ensuring proper magnetic path formation is built-in during manufacturing. This eliminates the need for operators to perform complex fine adjustments to prevent contact between components
Solution Approach 2:
The integrated magnetic path formation section acts as an intermediary that pre-establishes the correct spatial relationship between magnetic components, eliminating the need for operators to manually adjust positions during installation
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 enables easier and more efficient attachment of the actuator to the sound board, reducing the complexity of the mounting process and ensuring accurate positioning of the voice coil within the magnetic path space, thereby improving the stability and responsiveness of the actuator.
Implementation Method 1
a voice coil type actuator that generates drive force by inputting a drive signal to a voice coil disposed on a path of magnetic lines of force (magnetic path)
Implementation Method 2
a connection member connected to the bobbin and constructed to vibrate in response to vibration of the bobbin
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
In an actuator (50), a bobbin (511) to which a voice coil (513) is attached is disposed within a magnetic path space formed by a magnetic path forming section (52). A connecting shaft (514) is coupled to the bobbin (511), and a connection end portion (516A) at a distal end of the connecting shaft is connected to a sound board of a musical instrument. The length of the shaft (514) can be adjusted. When the actuator (50) is attached to the sound board, the length of the shaft (514) is adjusted and the connection end portion (516A) is connected to the sound board while a position of the voice coil (513) within the magnetic path space is maintained in a predetermined reference mounting position, in a state in which the magnetic path forming unit (52) is supported in a predetermined position by a support unit (55).