JP2636678B2 - Electronic musical instrument keyboard device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard device for an electronic musical instrument, and more particularly to a keyboard device in which a key unit that supports a plurality of keys in a swingable manner by a common mounting portion is assembled to a frame.

[0002]

2. Description of the Related Art As a conventional keyboard device of this kind of electronic musical instrument, for example, a keyboard device disclosed in Japanese Patent Publication No. 57-3080 is known. The keyboard of this electronic musical instrument
For example, when constructing a one-octave keyboard, this keyboard is divided into three parts: one structure composed of four black keys and two structures formed by alternately forming white keys in a comb shape. Things.

[0003] That is, the structure of a white key, which is a plastic molded product, is composed of a comb-shaped first unit composed of four keys of a C key, an E key, a G key and a B key, and a D key, an F key, and an It is divided into a comb-shaped second unit consisting of three keys. In each of these three structures, a key (key) portion, a mounting strip portion, and a hinge connecting portion for connecting them are integrally formed of resin.

Therefore, in such a keyboard device,
The mounting strip portions of the structure consisting of the black key, the structure consisting of the four white keys, and the structure consisting of the three white keys are overlapped and screwed to the frame for assembly.

[0005]

However, in such a conventional keyboard device for an electronic musical instrument, a large number of structures, that is, key units are superimposed on each other and fixed to a frame. And it takes a lot of time and requires a skill to work. The present invention has been made to solve the above-described problem, and facilitates an assembling operation when assembling a key unit having a plurality of keys to a frame, so that a plurality of keys can be easily and quickly attached at once. The purpose is to.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a plurality of keys, a common mounting portion for supporting each key independently and swingably, and a common mounting portion and each key. A key unit having a fulcrum for swingably connecting the key unit, a frame having a positioning locking hole, and a hook-shaped projection provided on a common mounting portion of the key unit. The hook-shaped projection has an elastic leg portion and a claw portion, and is inserted into the locking hole of the frame when the key unit is attached to the frame, so that the claw portion and the common mounting portion are formed. The key unit is positioned and locked by sandwiching the frame with the above, and the length of the elastic leg is substantially equal to the thickness of the frame.

Further, the key unit is formed by integrally molding a plurality of keys, a common connecting portion, and a fulcrum portion for each key with a resin, and overlapping the common mounting portions of the plurality of key units. Make up the keyboard of the specified range,
It is preferable that a projection for positioning is provided on one surface of the common connecting portion which is superimposed on each other, and a recess for fitting the projection is provided on the other surface.

It is preferable that one key unit is constituted by one octave of keys, and the plurality of key units constituting the keyboard are at least composed of a white key partial unit and a black key partial unit. Alternatively, the positioning locking holes of the frame and the hook-shaped projections of the common mounting portion inserted into the locking holes may be provided at two or more locations separated by a predetermined distance.

Further, each key of the key unit is provided with a guide portion for restricting the movement in the arrangement direction and operating the key unit when the key is operated, and the key unit is attached to the frame. At this time, it is preferable to provide means for retaining and locking the guide portion of each key.

[0010]

According to the keyboard apparatus for an electronic musical instrument according to the present invention, when a key unit for independently supporting a plurality of keys in a swingable manner is mounted on a frame, the keyboard unit is provided on a common mounting portion of the key unit. When the hook-shaped projection is inserted into the positioning locking hole of the frame, the frame is sandwiched between the claw portion of the hook-shaped projection and the common mounting portion, and the key unit is positioned and locked.

In addition, since the length of the elastic leg of the hook-shaped projection is substantially equal to the thickness of the frame, a large locking force can be obtained by the elastic force of the leg, and the key unit can be simply temporarily moved. In addition to locking, the key unit can be positioned and fixed to the frame, and the key unit can be assembled to the frame without using screws.

Therefore, it is possible to attach a plurality of keys to the frame easily and quickly with a single touch. That is, the attachment to the frame is extremely simple with one touch. In addition, since it is not necessary to use screws, the number of components is reduced, and screw holes are not required, which can contribute to cost reduction.

[0013] In the key unit, a plurality of keys, a common connecting portion, and a fulcrum portion for each key are integrally formed of resin.
If a keyboard in a predetermined key range is formed by overlapping the common attachment portions of a plurality of key units, a good-looking keyboard can be manufactured at a lower cost, and the common key units of the plurality of key units can be manufactured. When the connecting portions are overlapped with each other, the positioning protrusion on one surface and the positioning recess on the other surface are fitted to each other, so that mutual positioning can be easily performed, and a keyboard with good key arrangement can be easily formed. Can be assembled.

A keyboard for one octave can be easily obtained by overlapping the common mounting portions of the white key partial unit and the black key partial unit, which are key units. In addition, if the positioning locking hole of the frame and the hook-shaped projection of the common mounting portion are provided at two or more places separated by a predetermined distance,
The movement of the key unit in the turning direction about the fulcrum of the locking portion between the locking hole and the hook-shaped projection can also be restricted, so that the positioning is more reliable.

Further, the guide portion of each key is retained and locked when the key unit is attached to the frame, so that the locking portion between the locking hole and the hook-like projection and the locking of the guide portion can be prevented. Accordingly, the rotation of the key unit in the vertical direction is also restricted, and the mounting is further facilitated.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a keyboard device for an electronic musical instrument according to the present invention will be described below with reference to the drawings. 1 to 7 show an example of a structure which is a premise of a keyboard device for an electronic musical instrument according to the present invention. FIG. 1 is a longitudinal sectional view showing the entire keyboard device.

In FIG. 1, reference numeral 11 denotes a box-shaped lower case, in which a keyboard 15 integrated with a frame 13 is disposed. And
A part of the keyboard 15 is covered by an upper case 17, and a tone switch or the like is provided in the upper case 17, for example.

FIG. 2 is an exploded perspective view of a one-octave key constituting a part of the keyboard 15. In FIG. 2, reference numeral 21 denotes a black key unit, which is composed of five black keys, namely, a C key, a D key, an F key G key, and an A key (in FIG. , F♯ key and G♯ key are not shown)
Are integrally resin-molded.

Reference numeral 31 denotes a first white key unit consisting of four white keys, and a C key, an E key, a G key, and a B key (the E key and the G key are shown in FIG. (Omitted) is integrally molded with resin. That is, the first white key unit 31 is formed by integrally molding four out of every seven white keys among the seven white keys constituting one octave.

Reference numeral 41 denotes a second white key unit composed of three white keys, and includes a D key, an F key, and an A key (the second key
In the figure, the F key is not shown in the drawing). That is, the second white key unit 41
Is formed by integrally molding three white keys every other one of the seven white keys forming one octave.

Therefore, the one-octave keyboard 6 shown in FIG.
0 is the black key unit 2 which is a partial unit.
1 and a combination of the first white key unit 31 and the second white key unit 41.

As shown in FIGS. 2 and 4, each key of each of the key units 21, 31, 41 has a key body 50 having a predetermined length which can be pressed when arranged and arranged as a keyboard. A band-shaped common mounting portion 52 disposed on the rear end side of the key body portion 50 in the length direction to support the key body portion 50 in a swingable manner; and each key body portion 50 and the common mounting portion 52 And a fulcrum part 54 for integrally connecting the two, and these are integrally formed of resin.

The fulcrum portion 54 is a thin hinge portion, and as shown in FIG. 2, a thin plate-shaped horizontal thin plate piece 56 whose vertical cross section is formed in a substantially H-shape, Is a thin plate-shaped vertical thin plate piece 58 which is a portion formed in an H-shaped cross section. Therefore, the fulcrum portion 54 can bend the key body 50 by a predetermined angle in the vertical direction (vertical direction) by the horizontal thin plate piece 56 and in the left and right direction (horizontal direction) by the vertical thin plate piece 58 by elastic deformation. it can.

Each of the common mounting portions 52 of the key units 21, 31, 41 is formed of a plate having the same width and extends with a predetermined length in a direction perpendicular to the key body 50. It is formed as follows.

Then, the common mounting portion 5 of the second white key unit 41 is placed on the common mounting portion 52 of the first white key unit 31.
2 are superimposed, and the common mounting portion 52 of the black key unit 21 is further superimposed on the common mounting portion 52,
These seven white keys and five black keys constitute a keyboard 60 of one octave (predetermined key range) (see FIG. 5).

Here, in the seven white keys constituting the one-octave keyboard 60, the first white key unit 31 and the second white key unit
The white key unit 41 is positioned with respect to the white key unit 41 by the first positioning means 61.

That is, as shown in FIG. 2, the first positioning means 61 has a hole 63 formed substantially at the center in the length direction (key arrangement direction) of the common mounting portion 52 of the first white key unit 31. And a projection 65 formed at a substantially central portion of the common mounting portion 52 of the second white key unit 41 in the length direction (key arrangement direction) so as to be fitted downward into the hole 63.

The common mounting portion 52 of the first white key unit 31 has a convex portion 6 whose upper surface bulges upward in a rectangular shape.
7, the common mounting portion 52 of the second white key unit 41 is also formed with a rectangular concave portion 69 (the upper surface is a convex portion as shown in FIG. 2) corresponding to this shape. ing. The convex portion 67 fits into the concave portion 69, and positions the common mounting portions 52 in the width direction.

The common mounting portion 52 of the second white key unit 41
The hole 73 and the projection 75 constituting the second positioning means 71 similar to the first positioning means 61 are also provided as the positioning means between the common mounting portion 52 of the
Are formed respectively.

The holes 73 and the projections 75 are located in the respective common mounting portions 52 and extend in the length direction (key arrangement direction).
It is arranged in the middle part of. That is, the hole 73 is
In the F key support portion of the common mounting portion 52 of the white key unit 41,
The protrusions 75 are respectively provided on the F # key support portions of the common attachment portion 52 of the black key unit 21. The common mounting portion 52 of the black key unit 21 has a concave portion 77 having the same shape as the rectangular bulging convex portion 69 formed on the common mounting portion 52 of the second white key unit 41.

The one-octave keyboard 60 is configured as described above. However, when a keyboard is formed over a plurality of octaves, it is necessary to position the keyboards 60 of each octave. As shown in FIG. 3, the one-octave keyboard 60 and the one-octave keyboard on the lower or higher frequency side are positioned by a third positioning means 81, for example, in a key arrangement direction.

The third positioning means 81 is provided with holes 83 having the same structure as the first positioning means 61 at both ends in the length direction (key arrangement direction) of the common mounting portion 52 of the first white key unit 31. And a projection 85 fitted therein. Therefore, this third
The positioning means 81 of the keyboard 60 constituting one octave
Are arranged at the end of the common mounting portion 52 in the key arrangement direction, and FIG. 3 shows the configuration of the second positioning means 81 in cross section.

The three key units 21, 31 and 41, which are resin molded products, have three long holes 87, 89 and 91 formed at the same position in the length direction of each common mounting portion 52 at equal intervals. Have been. These long holes 87, 89, 9
1, each has a screw 9 as shown as an example in FIG.
3 is inserted, and as a result, the key unit assembly is mounted on a resin frame 13 as a whole.

Further, as shown in FIGS. 1, 5, and 6, the rear end side of the frame 13 has a locking wall 95 of a predetermined height.
The locking wall 95 is provided with rectangular locking holes 97 corresponding to the number of keys. Horizontal projections 99 projecting from the rear end side of the common mounting portion 52 of each key are fitted into these locking holes 97, respectively.

The locking hole 97 is formed to have a predetermined height in the vertical direction as shown in FIG. 1, and the width thereof is substantially equal to or slightly larger than the width of the projection 99. It is formed.

Therefore, when the keyboard 60 is mounted on the frame 13 as shown in FIG. 6, first, the key body 50 is held obliquely, and the projection 99 of the common mounting portion 52, which is the rear end of the key. Is inserted into the locking hole 97 of the locking wall 95 to regulate the movement of the common mounting portion 52 in the front-rear and left-right directions so that the temporary positioning is performed. That is, each projection 99 is provided with a projection for positioning and locking, and each locking hole 97.
Each constitute a positioning locking recess.

As shown in FIG. 2, a pair of guides 101 projecting downward along both side surfaces is provided on the lower surface of the intermediate portion of the key body 50 in the length direction of each key. A stopper 103 is formed at the lower end of each guide 101 to protrude horizontally. As shown in FIG. 1, the stopper 103 is a part of a sheet-like rubber member 105 attached to the lower surface of the frame 13.
7 to set the upper limit position of the key.

A switch 109 which is turned on by pressing a key is integrally formed on the sheet-like rubber member 105. The switch 109 is operated by an actuator 111 of the key body 50. Further, as shown in FIGS. 1 and 7, a part 107 of the rubber member 105 of the frame 13 is provided.
The horizontal slit 1 is connected to the vertical slit 113 that allows the guide 101 to move up and down.
15 are formed.

The horizontal slit 115 is provided in the key body 50
Is provided so that the stopper 103 of the guide 101 can pass from top to bottom at the time of attachment to the frame 13.

After the stopper 103 has once passed, the horizontal slit 115 is covered from below by restoring a part 107 of the rubber member 105, and the part 107 of the rubber member 105 is Act as That is, the stopper 103 comes into contact with the lower surface of the part 107 of the rubber member 105 from below, thereby restricting the retaining and the upper limit position of the key. In addition, as shown in FIG. 1, the lower surface of the rubber member 105 is pressed and attached by the printed board 117. 119 is frame 13
This is the battery holder formed in the above.

In the keyboard device of the electronic musical instrument thus constructed, the keyboard 60 of one octave is assembled, and then the keyboard 15 of a plurality of octaves is assembled to the frame 13. In this case, the second white key unit 41 is overlapped while positioned from above the first white key unit 31. For positioning at this time, the other protrusion 65 is fitted into one hole 63 of each common mounting portion that is the first positioning means 61,
At the same time, one of the convex portions 67 is fitted into the other of the concave portions 69.

As a result, the seven white keys are arranged and assembled as shown in FIG. 5, and the E key and the F key are beautifully assembled with a predetermined gap (equal intervals in the length direction). .

Next, the black key unit 21 is overlaid from above the white key unit 41. Positioning at this time is performed by fitting one projection 75 of each common mounting portion 52, which is the second positioning means 71, into the other hole 73, and simultaneously fitting the other convex portion into one concave portion 77. Do. After the assembly of the keyboard 60 of one octave is completed in this way, as shown in FIG.
Assemble the whole.

Thereafter, as shown in FIGS. 1 and 3,
A screw 93 is inserted into a hollow mounting boss 11a provided in the lower case 11, and a long hole 91 (or 87, 89) formed in the common mounting portion 52 of each key unit through the boss 11a and the hole of the frame 13. ), And the screw 93 is screwed into a boss 17 a having a screw hole of the upper case 17 and tightened and fixed.

In the case of arranging a plurality of octave keys on the frame 13, each of the adjacent low or high keys 6
Positioning between zero is performed by third positioning means 81 (see FIG. 3).

That is, for the keyboard 60 of a certain octave, the projection 85 projecting from the lower surface of the B key support portion of the common mounting portion 52 of the first white key unit 31 is connected to the first octave on the treble side. The positioning is performed by fitting into a hole 83 formed in the C key support portion of the common mounting portion 52 of the white key unit 31 of FIG.

FIG. 6 is a cross-sectional view showing the state during the assembly. The assembling method will be further described with reference to FIG. Each key unit 21, 3 for the frame 13
When assembling the keyboard 60 assembled with the first and the first 41, the projection 99 protruding from the rear end of the common mounting portion 52, which is a temporary assembling means, is fitted to a locking hole 97 formed in a locking wall 95 of the frame 13. Insert Thereby, the movement of the key rear end portion in the front-rear and left-right directions is regulated, and positioning is performed.

In this case, the rear end side wall surface of the common mounting portion 52 contacts the front surface of the locking wall 95. In this state, the key body 50 of the keyboard 60 can move up and down as a whole.
Vertical slit 113 and horizontal slit 11 of frame 13
5 can be passed from above.

At this time, a part 107 of the rubber member 105 shown in FIG. 1 is elastically deformed to allow the stopper 103 to pass therethrough.
Cover the horizontal slit 115 on the lower surface side and
3 is locked to prevent it from coming off.

Therefore, the keyboard 60 can be very easily assembled to the frame 13 by a series of operations. Thereafter, the common mounting portion 52 of each key unit is fixed to the frame 13 with the screw 93. At this time, the boss 11a of the lower case 11 and the boss 17a of the upper case 17 are jointly fastened by the screw 93 as described above. that time,
The entire body is turned upside down and screwed so that it can be tightened from the back side of the case 11.

In this way, a keyboard device having a plurality of octave keys on the frame 13 can be assembled very easily. In this case, the first and second positioning means 61, 7
1 is a resin molded product, which is arranged almost at the center in the key arrangement direction of the common mounting portion 52 where the deviation and the error are the smallest, so that the error is small even in the portion where the white keys are adjacent to each other after assembly, and Can be assembled beautifully.

When each key of the keyboard device is pressed, the horizontal thin plate piece 56 of the fulcrum portion 54 is bent up and down when the key body 50 is pressed, and swings up and down about the common mounting portion 52 as a fulcrum as a whole. . Then, by turning on the switch 109 disposed at a predetermined portion of the frame 13, a predetermined musical tone is generated.

Next, an embodiment of the present invention will be described. FIGS. 8 to 11 show only essential parts, and the other parts are the same as those of the keyboard device described with reference to FIGS. Since they are the same, the description is omitted.

In this embodiment, as shown in FIG. 8, instead of the screw 93, a black key unit 121 is used as a means for fixing the rear end of the key unit to the frame in the keyboard device described above.
Hook-like projection 121 which is a spring-like projection piece
And the frame 1 as shown in FIG.
A positioning locking hole 127 is formed in a corresponding portion (for example, a boss-shaped portion) of No. 3 and the hook-shaped projection 121 is inserted into the positioning locking hole 127 so that both can be positioned and fixed.

The hook-shaped projection 121 protrudes downward from the common attachment portion 52 by a predetermined length as shown in the figure, and has a lower end bent in a hook shape. This hook-shaped projection 1
21 has an elastic leg portion 123 which is a vertical portion and a claw portion 125 as shown in an enlarged view in FIG.
Is formed in a tapered shape that is inclined at a predetermined angle so that the front surface is gradually positioned closer to the front side toward the lower side, and a claw portion 125 is formed at the lower end to protrude forward.

The claw portion 125 also has a tapered surface tapering upward toward the front side. The elastic leg 123 is formed to have substantially the same thickness as the thickness of the plate of the frame 13. However, when the keyboard is constructed by overlapping a common mounting portion of a plurality of key units and is formed in a common connecting portion which is not located at the lowest position, the length is shown in FIG.
As shown in FIG. 1, the length of the portion protruding from the lower surface of the lowermost common mounting portion 52, that is, the common connecting portion 52 and the claw portion 125
Thus, the length is effective to sandwich the frame 13.

In this embodiment, as shown in FIG. 8, the hook-like projections 121 are provided on the common mounting portion 52 of the black key unit 21 at intervals in the longitudinal direction (the direction perpendicular to the plane of the drawing).
About three to four wires are formed. Accordingly, relief holes (not shown) are formed at the corresponding positions of the common mounting portions 52 of the first white key unit 31 and the second white key unit 41, respectively.

FIG. 11 shows these key units 21 and 3
Only the vicinity of the common mounting portion in a state where a keyboard is formed by superposing 1, 41 is shown. Other configurations are the same as those of the keyboard device described above.

Therefore, in this embodiment, the keyboard after assembling the common mounting portions 52 of the key units 21, 31, 41 by superimposing them is provided with the projections 99, which are temporary mounting means, on the locking walls 95 of the frame 13. After being temporarily inserted into the locking holes 97 (see FIGS. 5 to 7) formed in the frame 13, each hook-shaped protrusion 121 is strongly pushed into each positioning locking hole 127 of the frame 13 to be elastically deformed. 11, the frame 13 is sandwiched between the claws 125 and the common mounting portion 52 as shown in FIG.

The elastic legs 12 of each hook-shaped projection 121
A strong locking force is obtained by the elastic force of 3, and a keyboard having a key body 50 for one octave is positioned and fixed to the frame 13. That is, the key unit can be easily and quickly and accurately assembled to the frame with a single touch without using screws. Therefore, assembling efficiency can be improved, the number of parts is reduced by the number of screws, and screw hole processing is not required, which can contribute to cost reduction.

It is to be noted that it is possible to use an auxiliary screw to assure a more secure fixation, but even in this case, the number of screws can be reduced significantly. Further, since the hook-shaped projection 121 of the common mounting portion 52 and the positioning locking hole 127 of the frame 13 are engaged at a plurality of locations separated by a predetermined distance, the movement of the key unit about the locking portion in the turning direction. Is also regulated, and positioning at the time of mounting is ensured.

The guides 101 provided on the front of each key body 50 of each key unit are attached to the frame 1.
3, the vertical slit 113 and the horizontal slit are formed.
When the part 107 of the rubber member 105 shown in FIG. 1 is inserted while being bent, the stopper 103 is locked and the rotation of the key unit in the vertical direction (key pressing direction) is restricted. Is easier and more reliable.

The other operations are the same as in the above embodiment. It should be noted that seven white keys constituting a one-octave keyboard are referred to as a first white key unit integrating an F key, an A key, a C key and an E key, and a G key, a B key and a D key. Integrated 2nd
May be divided into two white key units.

In this case, when the first white key unit and the second white key unit are combined to form a one-octave keyboard, first positioning means for positioning these white key units. May be disposed on the A key supporting portion and the B key supporting portion (substantially the center of the common mounting portion in the key arrangement direction) of each common mounting portion of these white key units.

In the case where one octave keyboard, which is higher or lower tone than this one octave key, is arranged in parallel with the one octave key, the third positioning means for positioning between the octave keys is provided. It is arranged at the end of the common mounting portion of the keyboard in the key arrangement direction, that is, between the E key support portion and the F key support portion.

[0066]

As described above, the keyboard device for an electronic musical instrument according to the present invention has a common key unit when a key unit for supporting a plurality of keys independently and swingably is attached to a frame. Push the hook-shaped projection provided on the mounting part into the positioning locking hole of the frame and insert it.The frame is sandwiched between the claw part of the hook-shaped projection and the common mounting part of the key yoke, and the key unit is positioned. Locked.

A large locking force is obtained by the elastic force of the elastic legs of the hook-shaped projections, so that the key unit can be positioned and fixed to the frame in addition to temporarily locking the key unit. . That is, the key unit can be easily and quickly and accurately assembled to the frame with a single touch without using screws. Therefore, assembling efficiency can be improved, the number of parts is reduced by the number of screws, and screw hole processing is not required, which can contribute to cost reduction.

Further, the key unit is formed by integrally molding a plurality of keys, a common connecting portion, and a fulcrum portion for each key with resin, and a common mounting portion of the plurality of key units is overlapped to form a predetermined key. If the keyboard of the range is constituted, a good-looking keyboard can be manufactured at a lower cost, and when the common connecting portions of the plurality of key units are overlapped with each other, the positioning convex portion on one surface is formed. By fitting the positioning key and the positioning recess on the other surface, mutual positioning can be facilitated, and a keyboard with good key arrangement can be easily assembled.

In this case, a keyboard for one octave can be easily obtained by overlapping the common mounting portions of the white key partial unit and the black key partial unit, which are key units. Further, if the positioning locking hole of the frame and the hook-shaped protrusion of the common mounting portion are provided at two or more places separated by a predetermined distance, a key having the locking portion between the locking hole and the hook-shaped protrusion as a fulcrum. Since the movement in the rotating direction of the unit can be restricted, the positioning is more reliable.

Further, the guide portion of each key is retained and locked when the key unit is attached to the frame, so that the locking portion between the locking hole and the hook-like projection and the locking of the guide portion are prevented. Accordingly, the rotation of the key unit in the vertical direction is also restricted, and the mounting is further facilitated.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a configuration example of a keyboard device for an electronic musical instrument, which is a basis of the present invention.

FIG. 2 is an exploded perspective view showing each key unit constituting the keyboard.

FIG. 3 is a sectional view taken along line XX of FIG. 2 in the assembled state.

FIG. 4 is a side view of the vicinity of a common mounting portion in an assembled state of each key unit.

FIG. 5 is a plan view showing a state in which the keyboard is attached to a frame.

FIG. 6 is a longitudinal sectional view similar to FIG. 1, showing a state in which the keyboard is being mounted.

FIG. 7 is a perspective view showing the back side of the frame.

FIG. 8 is a side view showing a key rear end portion of the black key unit in one embodiment of the present invention.

FIG. 9 is a cross-sectional view taken along the upper surface of the frame, showing an engagement state between a hook-shaped projection provided on a common mounting portion of the key unit and a positioning locking hole formed in the frame.

FIG. 10 is an enlarged side view showing the hook-shaped protrusion.

FIG. 11 is a side view showing the vicinity of a common mounting portion of a keyboard similarly constituted by stacking a plurality of key units.

[Explanation of symbols]

11 lower case, 13 frame, 15 keyboard, 17
... upper case, 21 ... black key unit, 31 ... first white key unit, 41 ... second white key unit, 50 ... key body part, 52 ... common mounting part, 54 ... fulcrum part, 61 ... first Positioning means, 63 ... hole, 65 ... projection, 71 ... second positioning means, 73 ... hole, 75 ... projection, 81 ... third positioning means, 83 ... hole, 85 ... projection, 87, 89, 91 ... length Hole: 93: screw (attachment means), 95: locking wall, 97: locking hole, 99: projection, 101: guide, 103: stopper, 105: rubber member, 113: vertical slit, 115:
Horizontal slit, 121: hook-shaped projection, 123: elastic leg,
125 ... claw part, 127 ... positioning locking hole

Claims (5)

(57) [Claims] 1. A key comprising: a plurality of keys; a common mounting portion for independently supporting each key so as to freely swing; and a fulcrum portion for connecting the common mounting portion and each of the keys so as to swing freely. A frame having a positioning and locking hole, and a hook-like projection provided on a common mounting portion of the key unit, wherein the hook-like projection has an elastic leg and a claw, and When the key unit is inserted into the locking hole of the frame when the key unit is attached to the frame, the claw portion and the common mounting portion sandwich the frame to position and lock the key unit. A keyboard device for an electronic musical instrument, wherein a length of an elastic leg portion is substantially equal to a thickness of the frame. 2. The key unit according to claim 1, wherein the plurality of keys, a common connection portion, and a fulcrum portion for each key are integrally formed of resin, and the common attachment portions of a plurality of key units are overlapped. The common connecting portion is provided with a positioning convex portion on one surface of the common connecting portion which overlaps with the other, and a positioning concave portion for fitting with the convex portion on the other surface. 2. A keyboard device for an electronic musical instrument according to claim 1, wherein: 3. The key unit according to claim 1, wherein one unit is composed of keys for one octave, and the plurality of key units are at least a partial unit of a white key and a partial unit of a black key. A keyboard device for an electronic musical instrument according to claim 2. 4. The frame according to claim 1, wherein a positioning locking hole of the frame and a hook-like projection of the common mounting portion inserted into the locking hole are provided at two or more locations separated by a predetermined distance. The keyboard device for an electronic musical instrument according to claim 1. 5. A key unit is provided on each key of said key unit for restricting movement in the arrangement direction and operating up and down when each key is operated, and said key unit is attached to said frame. The keyboard device for an electronic musical instrument according to any one of claims 1 to 4, further comprising means for retaining and locking the guide portion of each key when performing the operation.