Electronic Keyboard Switch Board Segmentation for Chattering
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Solution Overview
Problem
Conventional electronic keyboard instruments experience chattering issues due to the impact of the hammer member on the key switch, causing unintended key switch activation and musical sound generation during consecutive key-striking.
Innovation Solution
The electronic keyboard instrument features a design with a first switch board and a second switch board independently provided on the keyboard chassis, where the first switch is activated by the key and the second switch by the hammer member, with a predetermined space between them to prevent impact transmission, ensuring stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the hammer member and key switch are arranged on the same switch board, then the structure is compact and simple, but the key switch is affected by impact from the hammer member causing chattering
Solution Approach 1:
The switch board is divided into a first switch board for the key switch and a second switch board for the hammer switch. These two switch boards are arranged separately and independently, preventing impact transmission from the hammer member to the key switch while maintaining functional integration.
2Force
If the hammer member is positioned close to the key switch, then the action load transmission is efficient, but impact causes unintended key switch activation
Solution Approach 1:
The force transmission path is separated from the impact path by dividing the switch board into two independent units. The hammer member transmits action load through its dedicated second switch board, while the key switch on the first switch board remains isolated from impact forces.
Solution Approach 2:
The second switch board acts as an intermediary structure that receives impact from the hammer member and isolates it from the first switch board. This mediator prevents direct transmission of harmful impact forces to the key switch while allowing electrical signal transmission.
3Ease of manufacture
If a single switch board is used for both key and hammer switches, then manufacturing and assembly are simplified, but chattering occurs during consecutive key-striking
Solution Approach 1:
The switch board system is segmented into two independent switch boards that can be manufactured separately and then assembled together. This segmentation enables better impact isolation while maintaining manufacturing efficiency through modular construction.
Solution Approach 2:
Instead of separating switches in the planar dimension of a single board, the solution uses vertical stacking to create two separate layers (first switch board and second switch board). This dimensional change allows impact isolation in the vertical direction while maintaining compact overall structure.
Data Source
AI summary
In an electronic keyboard instrument, a first switch board 11 and a second switch board 12 are independently provided in a keyboard chassis 1 separated from each other. The first switch board 11 has a first switch that is turned ON by a key 2 arranged on the keyboard chassis 1 in a manner to be rotatable in a vertical direction upon the depression of the key 2. The second switch board 12 has a second switch 5 that is turned ON by a hammer member 3 that rotates to be displaced in response to the depression of the key 2 and applies action load to the key 2. Accordingly, even if the second switch board 12 receives an impact from the hammer member 3 when the hammer member 3 turns ON the second switch 5, the impact is not easily transmitted to the first switch 4.