Reaction force generator and keyboard device of electronic musical instrument
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Nov 19, 2019
Grant Date -
Jul 19, 2018
app pub date -
Feb 12, 2018
filing date -
Aug 24, 2015
priority date (Note) -
In Force
status (Latency Note)
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Abstract
In a key switch (10), an inner dome (Din) starts to deform once a distal end portion (21) of the inner dome (Din) comes into contact with a base surface (93a) after an outer dome (Dout) starts to deform. A thick portion (25) extending straight and having a uniform wall thickness in a click generating portion (CL) has the thickness less than or equal to the minimum thickness of a thick portion (23) of an after stroke portion (AF). The degree of inclination of the thick portion (25) with respect to a center line (C0) (direction of pressing) is larger than that of the thick portion (23) with respect to the center line (C0) (θc>θa). Before the after stroke portion (AF) undergoes large deformation, the click generating portion (CL) undergoes buckling to cause a sudden decrease in a reaction force and generate a click feeling.
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