Structure of keyboard used in electronic keyboard instrument

Claim 2

A keyboard structure incorporated in an electronic keyboard instrument, comprising: (a) a plurality of key members each having a front end portion and a rear end portion, said front end portion being depressed by a player of said electronic keyboard instrument; (b) a plurality of flexible connecting members each coupled to the rear end portion of each key member; (c) a retainer member for retaining a circuit board and being coupled to each of said flexible connecting members which connects the retainer member and said key member; and (d) a plurality of key switches disposed on said circuit board, said retainer member retaining said circuit board so that each of said key switches opposes associated one of said key members, wherein said key members, said flexible connecting members and the retainer member are formed into a singular piece.

Claim 3

A keyboard structure as set forth in claim 1, in which said keyboard structure further comprises a plurality of coupling members each having a first element provided in the rear end portion of each key member and a second element provided in said retainer member, said first element being coupled with said second element.

Claim 4

A keyboard member as set forth in claim 2, in which said key members have a plurality of white keys and a plurality of black keys.

Claim 5

A keyboard as set forth in claim 3, in which said key members, said flexible connecting members, said retainer member and said coupling members are formed of a synthetic resin.

Claim 6

A keyboard structure as set forth in claim 2, in which all of said first elements are formed by a bar member and all of said second elements are formed by a pawl member.

Claim 7

A keyboard structure as set forth in claim 5, said bar member has a boss portion and a leading end portion larger in width than the boss portion and in which said pawl member has two pawls capable of being in mating engagement with the leading end portion of said bar member.

Claim 8

A keyboard structure as set forth in claim 2, in which said first element and said second element are formed into said singular piece.

Claim 9

A keyboard structure as set forth in claim 1, in which each of said flexible connecting members is similar in thickness than each of said key members, said flexible connecting members being deformable so as to cause each of said key switches to oppose to each of said key members.

Claim 10

A keyboard structure as set forth in claim 1, in which said retainer member is formed with two grooves having respective open ends confronted with each other and in which said circuit board has two side edges inserted into said grooves, respectively.

Claim 11

A keyboard structure as set forth in claim 1, in which said keyboard structure further comprises a plurality of stopper members each provided in the front end portion of each key member, each of said stopper members being capable of restricting a traveling length of the front end portion of each key member upon depression thereof.

Claim 12

A keyboard structure as set forth in claim 10, in which each of said stopper members has a stem portion projecting from the front end portion of each key member and two lateral protrusions projecting from the stem portion and spaced apart from each other, one of said lateral protrusions being brought into abutting engagement with an upper surface of said retainer member when the front end portion of each key member is depressed, the other protrusion being brought into abutting engagement with a lower surface of said retainer member when the front end portion of each key member is moved back.

Claim 13

A keyboard structure as set forth in claim 9, in which said stopper members are formed into said singular piece.

Claim 14

A keyboard structure as set forth in claim 1, in which said keyboard structure further comprises a plurality of guide members each formed in the front end portion of each key member.

Claim 15

A keyboard structure as set forth in claim 11, in which said guide members are formed into said singular piece.

Claim 16

A keyboard structure as set forth in claim 1, in which said keyboard structure further comprises a plurality of pushing members each formed in the front end portion of each key member, each of said pushing members being brought into abutting engagement with each of said key switches when the front end portion of each key is depressed.

Claim 17

A keyboard structure as set forth in claim 12, in which said pushing members are formed into said singular piece.

Claim 18

A keyboard structure as set forth in claim 1, in which said retainer member is connected to a framework and is stiff enough to support the key members.

Claim 19

A keyboard structure as set forth in claim 17, in which an electric conductive strips are patterned on a flexible film which is supported by said retainer member, said flexible film and said electric conductive strips as a whole serving as said circuit board.

Claim 20

A keyboard member forming part of a keyboard incorporated in an electronic keyboard instrument, comprising: (a) a plurality of key members serving as white keys and black keys, each key member having a front end portion and a rear end portion, said front end portion being resiliently deformable when a force is exerted thereon; (b) a plurality of flexible connecting members each coupled to the rear end portion of each key member, each of said flexible connecting members being formed by a plate smaller in thickness than each of said key members; (c) a retainer member for a circuit board coupled to said flexible connecting members and formed with two grooves having respective open ends confronted with each other, said circuit board having two side edges inserted into said grooves, respectively, a plurality of key switches being provided on said circuit board in association with said key members; (d) a coupling unit having a bar member provided in the rear end portion of each key member and a pawl member provided in said retainer member, said bar member having a boss portion and a leading end portion larger in width than the boss portion, said pawl member having two pawl portions capable of being in mating engagement with the leading end portion of said bar member; (e) a plurality of stopper members each provided in the front end portion of each key member, each of said stopper members having a stem portion projecting from the front end portion of each key member and two lateral protrusions projecting from the stem portion and spaced apart from each other, one of said lateral protrusions being brought into abutting engagement with an upper surface of said retainer member when the front end portion of each key member is deformed, the other protrusion being brought into abutting engagement with a lower surface of said retainer member when the front end portion of each key member is resiliently restored, thereby restricting a traveling length of the front end portion of each key member; (f) a plurality of guide members each provided in the front end portion of each key member; and (g) a plurality of pushing members each provided in the front end portion of each key member and having two plates intersecting each other, each of said pushing members being brought into abutting engagement with each of said key switches when the front end portion of each key is deformed, wherein said key members, said flexible connecting members, said retainer member, said coupling members, said stopper members, said guide members and pushing members are formed of a synthetic resin and into a singular piece.

Claim 21

A keyboard member forming part of a keyboard incorporated in an electronic keyboard instrument, comprising: (a) a plurality of key members serving as white keys and black keys, each key member having a front end portion and a rear end portion, said front end portion being resiliently deformable when a force is exerted thereon; (b) a plurality of flexible connecting members each coupled to the rear end portion of each key member, each of said flexible connecting members being formed by a plate smaller in thickness than each of said key members; (c) a retainer member for a circuit board coupled to said flexible connecting members and formed with two grooves having respective open ends confronted with each other, said circuit board having two side edges inserted into said grooves, respectively, a plurality of key switches being provided on said circuit board in association with said key members; (d) a coupling unit having a bar member provided in the rear end portion of each key member and a pawl member provided in said retainer member, said bar member having a boss portion and a leading end portion larger in width than the boss portion, said pawl member having two pawl portions capable of being in mating engagement with the leading end portion of said bar member; (e) a plurality of stopper members each provided in the front end portion of each key member, each of said stopper members having a stem portion projecting from the front end portion of each key member and two lateral protrusions projecting from the stem portion and spaced apart from each other, one of said lateral protrusions being brought into abutting engagement with an upper surface of said retainer member when the front end portion of each key member is deformed, the other protrusion being brought into abutting engagement with a lower surface of said retainer member when the front end portion of each key member is resiliently restored, thereby restricting a traveling length of the front end portion of each key member; (f) a plurality of guide members each provided in the front end portion of each key member; and (g) a plurality of pushing members each provided in the front end portion of each key member and having two plates intersecting each other, each of said pushing members being brought into abutting engagement with each of said key switches when the front end portion of each key is deformed, wherein said key members, said flexible connecting members, said retainer member, said coupling members, said stopper members, said guide members and pushing members are formed of a synthetic resin and into a singular piece.

Claim 22

A keyboard member forming part of a keyboard incorporated in an electronic keyboard instrument, comprising: (a) a plurality of key members serving as white keys and back keys, each key member having a front end portion and a rear end portion, said front end portion being resiliently deformable when a force is exerted thereon; (b) a plurality of flexible connecting members each coupled to the rear end portion of each key member, each of said flexible connecting members being formed by a plate smaller in thickness than each of said key members; (c) a retainer member for a flexible film coupled to said flexible connecting members, electrical conductive strips being patterned on said flexible film and accompanied by a plurality of key switches in association with said key members, said retainer member being secured to a framework and stiff enough to support said key members; (d) a coupling unit having a bar member provided in the rear end portion of each key member and a pawl member provided in said retainer member, said bar member having a boss portion and a leading end portion larger in width than the boss portion, said pawl member having two pawls capable of being in mating engagement with the leading end portion of said bar member; (e) a plurality of stopper members each provided in the front end portion of each key member, each of said stopper members having a stem portion projecting from the front end portion of each key member and two lateral protrusions projecting from the stem portion and spaced apart from each other, one of said lateral protrusions being brought into abutting engagement with an upper surface of said retainer member when the front end portion of each key member is deformed, the other protrusion being brought into abutting engagement with a lower surface of said retainer member when the front end portion of each key member is resiliently restored, thereby restricting a traveling length of the front end portion of each key member; (f) a plurality of guide members each provided in the front end portion of said retainer member for restricting a lateral movement of each key member; and (g) a plurality of pushing members each provided in the front end portion of each key member and having two paltes crossing each other, each of said pushing members being brought into abutting engagement with each of said key switches when the front end portion of each key is deformed, wherein said key members, said flexible connecting members, said retainer member, said coupling members, said stopper members, said guide members and pushing members are formed of a synthetic resin and into a singular piece.

Claim 23

A keyboard member forming part of a keyboard incorporated in an electronic keyboard instrument, comprising: (a) a plurality of key members serving as white keys and back keys, each key member having a front end portion and a rear end portion, said front end portion being resiliently deformable when a force is exerted thereon; (b) a plurality of flexible connecting members each coupled to the rear end portion of each key member, each of said flexible connecting members being formed by a plate smaller in thickness than each of said key members; (c) a retainer member for a flexible film coupled to said flexible connecting members, electrical conductive strips being patterned on said flexible film and accompanied by a plurality of key switches in association with said key members, said retainer member being secured to a framework and stiff enough to support said key members; (d) a coupling unit having a bar member provided in the rear end portion of each key member and a pawl member provided in said retainer member, said bar member having a boss portion and a leading end portion larger in width than the boss portion, said pawl member having two pawls capable of being in mating engagement with the leading end portion of said bar member; (e) a plurality of stopper members each provided in the front end portion of each key member, each of said stopper members having a stem portion projecting from the front end portion of each key member and two lateral protrusions projecting from the stem portion and spaced apart from each other, one of said lateral protrusions being brought into abutting engagement with an upper surface of said retainer member when the front end portion of each key member is deformed, the other protrusion being brought into abutting engagement with a lower surface of said retainer member when the front end portion of each key member is resiliently restored, thereby restricting a traveling length of the front end portion of each key member; (f) a plurality of guide members each provided in the front end portion of said retainer member for restricting a lateral movement of each key member; and (g) a plurality of pushing members each provided in the front end portion of each key member and having two paltes crossing each other, each of said pushing members being brought into abutting engagement with each of said key switches when the front end portion of each key is deformed, wherein said key members, said flexible connecting members, said retainer member, said coupling members, said stopper members, said guide members and pushing members are formed of a synthetic resin and into a singular piece.