KEYBOARD DEVICE FOR ELECTRONIC MUSICAL INSTRUMENT

摘要

PURPOSE:To improve the productivity by realizing key scaling on the electronic keyboard musical instrument with a touch feeling by simple and inexpensive structure. CONSTITUTION:The keyboard device for the electronic musical instrument has many-key return springs 10 formed integrally with a key support member 3. The tip 18 of each key return spring 10 is engaged with the spring support member 17 of a key 1 and curved in a convex shape to energize the key 1 in its return direction. Each key return spring 10 is made gradually narrow in width from the low-tone side to the high-tone side to vary the spring constant, and consequently the key scaling with the touch feeling is enabled.