Keyboard type electronic musical instrument

Claim 2

A keyboard type electronic musical instrument comprising a plurality of keys mounted depressably in the vertical direction on a key support frame, a plurality of light guide members each provided for each key, each said light guide members having a passage through which light can travel, and being deformable to change the effective cross sectional area of the passage and provided at one end with a light-sensitive variable resistor and at the other end with a light source, the underside of each said key being provided with an operating member adapted to deform the associated light guide member when the associated key is depressed from a lower set position thereof to thereby control the quantity of light from the light source incident on the light-sensitive variable resitor, an additional performance effect control circuit controlled by electric signals from said individual light-sensitive variable resistors, a sound producing system connected to said performance effect control circuit, and switches each operated by depressing an associated key, said switches being connected between sound sources and said performance effect control circuit.

Claim 3

The keyboard type electronic musical instrument according to claim 1, wherein each said light guide member is a tube having resiliency.

Claim 4

The keyboard type electronic musical instrument according to claim 1, wherein each said operating member is formed at the lower end thereof with a notch adapted to engage with the associated light guide member.

Claim 5

The keyboard type electronic musical instrument according to claim 1, wherein said individual light guide members are arranged with their longitudinal direction aligned to the longitudinal direction of the respective keys and supported on respective support bases, each said light guide member having its opposite ends secured to the associated support base by retaining members.

Claim 6

A keyboard type electronic musical instrument comprising a plurality of the keys mounted depressably in the vertical direction on a key support frame, a plurality of light guide members each provided for each key, each said light guide member having a passage through which light can travel, and being deformable to change the effective cross sectional area of the passage and provided at one end with a light-sensitive variable resistor and at the other end with a light source, the underside of each said key being provided with an operating member adapted to deform the associated light guide member laterally when the associated key is driven in the lateral direction from a lower set position thereof to thereby control the quantity of light from the light source incident on the light-sensitive variable resistor, an additional performance effect control circuit controlled by electric signals from said individual light-sensitive variable resistors, a sound producing system connected to said performance effect control circuit, and Switches each operated by depressing an associated key, said switches being connected between sound sources and said performance effect control circuit.

Claim 7

A keyboard type electronic musical instrument comprising a plurality of the keys mounted depressably in the vertical direction on a key support frame, a plurality of light guide members each provided for each key, each said light guide member having a passage through which light can travel, and being deformable to change the effective cross sectional area of the passage and provided at one end with a light-sensitive variable resistor and at the other end with a light source, the underside of each said key being provided with an operating member adapted to deform the associated light guide member laterally when the associated key is driven in the lateral direction from a lower set position thereof to thereby control the quantity of light from the light source incident on the light-sensitive variable resistor, an additional performance effect control circuit controlled by electric signals from said individual light-sensitive variable resistors, a sound producing system connected to said performance effect control circuit, and Switches each operated by depressing an associated key, said switches being connected between sound sources and said performance effect control circuit.

Claim 8

The keyboard type electronic musical instrument according to claim 5, wherein each said light guide member is a tube having resiliency.

Claim 9

The keyboard type electronic musical instrument according to claim 5, wherein each said operating member is deformed at the lower end thereof with a notch adapted to engage with the associated light guide member.

Claim 10

The keyboard type electronic musical instrument according to claim 5, wherein said individual light guide members are arranged with their longitudinal direction aligned to the longitudinal direction of the respective keys and supported on respective support base, each said light guide member having its opposite ends secured to the associated support base by retaining members and its intermediate portion extending between said retaining members capable of being deformed in the lateral direction.

Claim 11

A keyboard type electronic musical instrument comprising a plurality of keys mounted depressably in the vertical direction on a key support frame, a plurality of light guide members each provided for each key, each said light guide member having a passage through which light can travel, and being deformable to change the effective cross sectional area of the passage and provided at one end with a light-sensitive variable resistor and at the other end with an optical fiber, the individual optical fibers being bundled at their end remote from the light guide members, a light source disposed to face the bundled end of said optical fibers, the underside of each said key being provided with an operating member adapted to deform the associated light guide member when the associated key is driven at a lower position thereof to thereby control the quantity of light from said light source incident on the associated light-sensitive variable resistor, an additional performance effect control circuit controlled by electric signals from said individual light-sensitive variable resistors, a sound producing system connected to said performance effect control circuit, and switches each operated by depressing an associated key, said switches being connected between sound sources and said performance effect control circuit.

Claim 12

A keyboard type electronic musical instrument comprising a plurality of keys mounted depressably in the vertical direction on a key support frame, a plurality of light guide members each provided for each key, each said light guide member having a passage through which light can travel, and being deformable to change the effective cross sectional area of the passage and provided at one end with a light-sensitive variable resistor and at the other end with an optical fiber, the individual optical fibers being bundled at their end remote from the light guide members, a light source disposed to face the bundled end of said optical fibers, the underside of each said key being provided with an operating member adapted to deform the associated light guide member when the associated key is driven at a lower position thereof to thereby control the quantity of light from said light source incident on the associated light-sensitive variable resistor, an additional performance effect control circuit controlled by electric signals from said individual light-sensitive variable resistors, a sound producing system connected to said performance effect control circuit, and switches each operated by depressing an associated key, said switches being connected between sound sources and said performance effect control circuit.

Claim 13

The keyboard type electronic musical instrument according to claim 9, wherein each said light guide member is a tube having resiliency.

Claim 14

The keyboard type electronic musical instrument according to claim 1, wherein each said operating member is formed at its lower end with a notch adapted to engage with the associated light guide member.