Keyboard switch apparatus for electronic musical instrument

A keyboard switch apparatus for an electronic musical instrument, comprising:

• a first layer;
• a second layer having elasticity;
• a third having elasticity and arranged between said first and second layers;
• a first spacer member arranged between said first and third layers;
• a second spacer member arranged between said second and third layers;
• a first switch comprising conductors respectively formed on opposite surfaces of said second and third layers;
• a second switch comprising conductors respectively formed on opposite surfaces of said first and third switches,
• one of said conductors constituting said second switch being printed on an upper surface of said first layer,
• said first and second spacer member being made of sheet members each having an opening so as to allow switching of said conductors constituting said first and second switches,
• the other of said conductors constituting said second switch being printed on a lower surface of said second layer,
• remaining ones of said conductors consituting said first and second switches being printed on two surfaces of said third layer,
• said second and third layers being sequentially deformed by an actutator interlocked with key depression to sequentially close said first and second switches, and
• a time for closing said first switch being different from a time for closing said second switch;
• means for generating a signal corresponding to a key depression speed by detecting the difference between the timings of closure of said first and second switches;
• and
• means for generating a musical tone signal of said instrument in response to said signal.

A keyboard switch apparatus for an electronic musical instrument, comprising:

• a first layer;
• a second layer having elasticity;
• a third layer having elasticity and inserted between said first and second layers;
• first and second spacer members for separating said first and second layers from each other;
• a first switch comprising conductors respectively formed on opposite surfaces of said second and third layers;
• a second switch comprising conductors respectively formed on opposite surfaces of said first and third layers,
• said second and third layers being sequentially deformed by an actuator interlocked with key depression to sequentially close said first and second switches, a time for closing said first switch being different from a time for closing said second switch;
• means for generating a signal corresponding to a key depression speed by detecting the difference between the timings of closure of said first and second switches;
• and
• means for generating a musical tone signal of said instrument in response to said signal.