Circuit Board Positioning in Electronic Keyboard Instruments
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Solution Overview
Problem
Existing electronic keyboard instruments with hammer action mechanisms face challenges in maintaining circuit boards due to their placement, which hinders easy access and efficient space utilization.
Innovation Solution
The circuit board is positioned above the hammer action mechanism and held by a reinforcing structure that includes bridged side plates, allowing for easy maintenance and effective space utilization, with the soundboard covering the circuit board to enhance structural support and sound production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the circuit board is disposed in the rear half of the instrument main body at nearly the same height as the keyboard, then the space utilization is improved, but the ease of maintenance deteriorates
Solution Approach 1:
The patent repositions the circuit board from a horizontal arrangement (at keyboard height) to a vertical arrangement (above the hammer action mechanism), utilizing the vertical dimension for improved accessibility while maintaining compact space utilization within the instrument main body
2Volume of moving object
If the circuit board is disposed in a lower part of the instrument main body, then the space utilization is improved, but the ease of maintenance deteriorates
Solution Approach 1:
The patent transitions the circuit board position from a lower horizontal placement to an upper vertical placement above the hammer action mechanism, utilizing vertical space to achieve both compact instrument dimensions and improved maintenance accessibility
3Strength
If the soundboard is disposed at a location upward of the circuit board, then the structural support is improved, but the device complexity increases
Solution Approach 1:
The patent designs the holding part to serve dual functions: it holds the circuit board in position and simultaneously reinforces the instrument main body structure, eliminating the need for separate reinforcement elements and reducing overall device complexity
Solution Approach 2:
The patent combines the circuit board holding function and the structural reinforcement function into a single integrated holding part, simplifying the overall structure while maintaining both support and reinforcement functions
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 easy maintenance of the circuit board while optimizing space usage, maintaining the instrument's compactness and sound quality by allowing the soundboard to function as a lid covering the circuit board.
Implementation Method 1
a vibration exciting unit disposed on the soundboard and configured to excite the soundboard in accordance with a supplied musical tone signal to thereby produce sound by vibration of the soundboard
Data Source
AI summary
An electronic keyboard instrument with a hammer action, in which a circuit board for generating electronic musical tones can be disposed at a location for easy maintenance and for effective space utilization. Front and rear bars are bridged between side plates of an instrument main body so as to extend parallel to each other in the left-right direction and reinforce the instrument main body. A hammer action mechanism having hammers for respective keys is disposed rearward of a key-depression part of a keyboard and upward of a rear end portion of the keyboard, and a board tray is bridged between the front and rear bars. The board tray and the circuit board are located upward of the hammer action mechanism.