JP3267285B2 - Keyboard device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard device such as an electronic musical instrument, and more particularly, to a plurality of mutually different keys swingable to a common mounting portion via fulcrum portions. The present invention relates to a keyboard device provided with a keyboard unit configured by superposing a plurality of supported keyboard unit portions on a common mounting portion. 2. Description of the Related Art As a conventional keyboard device of this kind, for example, one disclosed in Japanese Patent Publication No. 57-3080 is known. This keyboard device divides a one-octave keyboard into three structures, one structure consisting of five black keys and two structures formed by combing white keys every other. It is. [0003] That is, the white key structure, which is a plastic molded product, has 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, an A key. And 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 plastic. Therefore, in such a keyboard device,
The mounting strips of the structure consisting of a black key, the structure consisting of four white keys, and the structure consisting of three white keys are overlapped and screwed to a frame for assembly. [0005] However, in such a conventional keyboard device for an electronic musical instrument, in the case of a one-octave keyboard, the two white key structures are superimposed on each other. There is no positioning means in this case, so that the skill is required for the assembling work, and the keys, especially the white keys, are located in adjacent portions (the gap between the E key and the F key, the gap between the B key and the C key). In other words, there has been a problem that the appearance may be impaired due to irregularities. In other words, a portion where white keys are lined up without a black key interposed therebetween is likely to be noticeable when irregularities due to mounting, manufacturing, and the like occur. Therefore, errors in this portion must be minimized as much as possible. I couldn't do that. [0007] The present invention has been made in order to solve such a problem, a plurality of keys units having a plurality of structures i.e. different keys each as described above
The door, in a keyboard apparatus comprising a keyboard unit configured by superimposing the respective mounting strip portions (common mounting unit), so as to position the key unit mutually constituting each keyboard unit performed easily and accurately, more adjacent Do
Easy and accurate positioning of keyboard units
Unishi Te, gaps white key adjacent to the aims to avoid irregular. Also, when operating the black key,
It is another object of the present invention to surely prevent rubbing between adjacent white keys. [0008] To achieve the above object, the present invention provides a keyboard device having a keyboard unit as follows.
Be configured as follows. The keyboard unit has a black key unit, a white key unit, and a fitting means. The black key unit includes a plurality of black keys in a predetermined key range to be pressed and each black key.
A first common mounting portion for pivotably supported in the vertical direction, and a first fulcrum portion connecting its first common mounting portion and each of the black keys, white keys unit, the predetermined key area It includes a plurality of white keys belonging thereto, a second common mounting portion for supporting each of the white keys so as to be swingable in the vertical direction, and a second fulcrum portion connecting the second common mounting portion and each of the white keys. [0010] Further, the fitting means is an uneven portion provided on the first common mounting portion and the second common mounting portion,
The unevenness is used to position the first common mounting portion on the second common mounting portion to form a keyboard unit having a predetermined key range by the white key unit and the black key unit. It is intended to fit the first common mounting portion and the second common mounting portions, at least one of the first and second fulcrum portion provided in the white keys and black keys, the first co
Between the through mounting part and each black key or the second common mounting part and each white key
A vertical thin plate is provided between the key and the key so that the black key or the white key can be flexed in the horizontal direction. In such a keyboard device, the predetermined
The key range can be a one-octave key range. With this configuration, the positioning between the black key unit and the white key unit where the common mounting portions overlap each other can be performed by fitting the concave and convex portions provided on the first and second common mounting portions. Positioning work is easy. In addition, since the common mounting portion of the black key unit is superimposed on the common mounting portion of the white key unit, the fulcrum of the black key is made higher than the fulcrum of the white key, so that the back and forth movement and the inclination when operating the black key can be suppressed. . In addition, at least one of the white key and the black key
Rolling by vertical thin strip provided at the point
Because it bends in the horizontal direction without touching it, it is possible to prevent the tip or side of the black key from touching the adjacent white key and generating squeak noise or impairing the operability of the key. . In a keyboard device having a plurality of keyboard units adjacent to each other in the key arrangement direction, the keyboard unit has a first key unit, a second key unit, and a fitting means, and the first key unit A first plurality of keys, each of which includes a part of keys belonging to a predetermined key area to be pressed, a first common mounting portion for swingably supporting the first plurality of keys,
A second support unit including a common attachment portion and a first fulcrum portion for connecting the first plurality of keys, wherein the second key unit includes a second plurality of keys including a part of keys belonging to the predetermined key range; Wherein the second plurality of keys are different from the first plurality of keys, a second common mounting portion for swingably supporting the second plurality of keys, the second common mounting portion, and the second plurality of keys. And a second fulcrum unit for connecting the key to the second support. The fitting means has a first fitting means and a second fitting means, and the first fitting means is provided on the first common mounting portion and the second common mounting portion. The first and second key units form a keyboard unit having a predetermined key range by overlapping a second common mounting unit on the first common mounting unit. At this time, positioning is performed in two directions of the key arrangement direction and the key longitudinal direction of each key unit.
The common mounting portion and the second common mounting portion are fitted to each other, and the second fitting means performs positioning by fitting the same key unit in adjacently arranged keyboard units. It is characterized by having means. Also in such a keyboard device, the predetermined key range can be a one-octave key range. With this configuration, the positioning in the key arrangement direction and the key longitudinal direction between the first key unit and the second key unit constituting each keyboard unit is performed by the first and second key units which are overlapped with each other. Since the first fitting means provided on the common mounting portion is fitted by concave and convex, the positioning work can be easily and accurately performed. Further, since positioning between adjacent keyboard units is performed by the second fitting means which is fitted between the same key units of each keyboard unit, it is possible to easily and accurately maintain the continuity. Embodiments of the keyboard device according to the present invention will be described below in detail with reference to the drawings. FIG.
FIG. 1 is a principle diagram showing a schematic configuration of one embodiment of a keyboard device according to the present invention. The keyboard device shown in FIG. 1 includes two keyboard units 7 and 17 having the same configuration. Each of the keyboard units 7 and 17 includes a first keyboard unit 9 and a second keyboard unit 11, respectively.
And fitting means 15. The first keyboard unit 9
Is a first plurality of keys 1 in a predetermined key range to be pressed,
A first common mounting portion 5 for swingably supporting the first plurality of keys 1 and a first fulcrum portion 3 for connecting the first common mounting portion 5 and the first plurality of keys 1 respectively. And these are integrally formed of resin. The second keyboard unit 11 is a key belonging to the predetermined key range, and is a second key different from the first plurality of keys 1.
A plurality of keys 2, a second common mounting portion 6 for swingably supporting the second plurality of keys 2, and a connection between the second common mounting portion 6 and the second plurality of keys 2, respectively. And a second fulcrum portion 4, which are integrally formed of resin. The fitting means 15 comprises a first common mounting portion 5 and a second
The first keyboard unit 9 and the second keyboard unit 11 are provided at an intermediate portion of the common mounting portion 6 except for the end in the key arrangement direction.
When the keyboard unit 7 or 17 of a predetermined key range is formed by combining the above, the positioning unit is used to position the keyboard unit portions 9 and 11 by fitting. Further, the first keyboard unit portions 9 and 9 of the keyboard unit 7 and the keyboard unit 17 arranged side by side, respectively.
The unit connecting means 19 is provided at the connecting portion of the first common mounting portions 5 and 5. In this keyboard device, when the first keyboard unit 9 and the second keyboard unit 11 are combined to form the keyboard unit 7 or 17 in a predetermined key range, the fitting means 15 is fitted. As a result, the first keyboard unit 9
And the second keyboard unit 11 are positioned. Thereby, the position of each first key 1 and second key 2 is determined. Therefore, the keyboard units 9, 11 can be accurately positioned. That is, after the keyboard units 7 and 17 in a predetermined key range are formed, the keys 1 and 2 are not misaligned. Further, the first keyboard unit 9 and the second keyboard unit 11 can be attached to the frame of the keyboard device with an orderly key arrangement easily even by a non-expert. Further, since the first common mounting portion 5 and the second common mounting portion 6 are fitted by the fitting means 15, after the keyboard units 7, 17 in a predetermined key range are formed, the keyboard unit portions 9, 11 are shifted. Not even. Next, a specific embodiment of the keyboard device according to the present invention will be described with reference to FIGS. FIG.
FIG. 3 is an exploded perspective view of an octave key. In this figure, reference numeral 21 denotes a black key unit, which includes five black keys, ie, a C key 23, a D key 24 (not shown in FIG. 2),
A key 25 (not shown in FIG. 2), a G key 26 (not shown in FIG. 2), and an A key 27 are integrally formed by resin molding. Reference numeral 31 denotes a first white key unit composed of four white keys, and includes a C key 33, an E key 34 (not shown in FIG. 2), a G key 35 (not shown in FIG. 2), and a B key 36.
Are integrally resin-molded. That is, this first
The white key unit 31 is formed by integrally molding four keys every other one of seven white keys constituting one octave. Reference numeral 41 denotes a second white key unit comprising three white keys, and is formed by integrally molding a D key 43, an F key 44 (not shown in FIG. 2), and an A key 45 with resin. That is, the second white key unit 41 is formed by integrally molding three keys out of every seven of the seven white keys constituting one octave. Therefore, the one-octave keyboard unit 60 is formed by combining the black key unit 21, the first white key unit 31, and the second white key 41, each of which constitutes a keyboard unit. Here, these units 21, 31,
As shown in FIG. 7, each key 41 has a key body 50 having a predetermined length that is depressed when arranged and arranged as a keyboard, and a longitudinal rear end of the key body 50. And a fulcrum part 54 for connecting the key body 50 and the common mounting part 52 integrally with each other. These are integrally formed of resin. The fulcrum (thin hinge) 54 is shown in FIG.
As shown in FIG. 7 and FIG. 7, the first hinge portion 5 has a thin horizontal plate piece 55 whose vertical cross section is H-shaped.
6 and a second hinge portion 58 having a vertical thin plate piece 57 whose horizontal cross section is H-shaped and thin.
0 between the rear end and the common mounting portion 52. Therefore, the fulcrum part 54 is vertically moved (vertical direction) by the first hinge part 56, and left and right direction (horizontal direction) by the second hinge part 58.
In addition, the key body 50 can be bent by a predetermined angle. Each of the common mounting portions 52 of the units 21, 31, and 41 is formed of a plate having the same width.
It is formed so as to extend with a predetermined length in a direction orthogonal to zero. Then, the common mounting portion 52 of the second white key unit 41 is superimposed on the common mounting portion 52 of the first white key unit 31, and furthermore, the common mounting portion 52
The common mounting portion 52 of the black key unit 21 is superimposed on the white keys 33 to 36, 43 to 45 and 5.
A keyboard unit 60 of one octave (predetermined key range) is constituted by the black keys 23 to 27 (see FIGS. 4 and 5). Here, a one-octave keyboard unit 60
, A first white key unit 31 and a second white key unit 41 provided with seven white keys 33 to 36 and 43 to 45
Are positioned by the first positioning means 61. The one-octave keyboard unit 60 and the one-octave keyboard unit on the lower or higher frequency side than this are positioned by the second positioning means 71 in a predetermined direction such as the key arrangement direction. 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 the common mounting portion 52 of the second white key unit 41
And a protrusion 65 which is formed at a substantially central portion in the length direction (key arrangement direction) so as to protrude downward so as to fit into the hole 63. In other words, when the first white key unit 31 and the second white key unit 41 are combined to form the keyboard unit 60 of one octave, the first white key unit 31 and the second white key unit 41 are positioned. 1 positioning means 61
Are provided in the common mounting portions 52 at the positions of the E key 34 and the F key 44 of the white key units 31 and 41. The upper surface of the common mounting portion 52 of the first white key unit 31 bulges upward in a rectangular shape, and the common mounting portion 52 of the second white key unit 41 also has a rectangular recess corresponding to this shape. Are formed. The rectangular bulge fits into the rectangular dent to determine the position of the common mounting portion 52 in the width direction. The common mounting portion 52 of the black key unit 21
And a common mounting portion 52 of the second white key unit 41, a hole 81 having a similar configuration as a positioning means therebetween.
And a projection 83 are formed respectively. These holes 8
1 and the projection 83 are respectively located on the common mounting portion 52,
It is arranged at an intermediate portion in the length direction (key arrangement direction). The hole 81 is provided on the common mounting portion 52 at the position of the F key 44, and the projection 83 is provided on the common mounting portion 52 at the position of the F key 25. In addition, these common mounting portions 5
2 has the same configuration in that a recess having the same shape as the rectangular bulging portion is formed. The one-octave keyboard unit 60 is configured as described above. However, when a keyboard spanning a plurality of octaves is configured, the keyboard unit 60 of each octave is used.
Positioning between them is required. The second positioning means 71 for performing this positioning is provided with holes 73 having the same configuration as the first positioning means 61 at both ends in the longitudinal direction (key arrangement direction) of the common mounting portion 52 of the first white key unit 31. The projections 75 to be fitted therein are respectively formed. The second positioning means 71 is disposed at the end of the common mounting portion 52 of the keyboard unit 60 constituting one octave in the key arrangement direction. FIG. 3 shows the configuration of the second positioning means 71 in cross section. The three units 21, 31, 41, which are resin molded products, have three long holes 84, 85, 86 formed at the same position in the longitudinal direction in the common mounting portion 52 at equal intervals. . As shown in FIG. 3, screws 90 are inserted into these long holes 84, 85, 86, and as a result, the unit assembly is mounted on a resin frame 91 as a whole. Note that, as shown in FIG.
Is formed with an insertion hole 95 into which a horizontal projection 93 formed on the common mounting portion 52 of each key is fitted. In the keyboard device according to the above configuration, the one-octave keyboard unit 6
0 is assembled to the frame 91. In this case, the first white key unit 31 is positioned from above and the second white key unit 41 is overlaid. The positioning at this time is performed by fitting the projection 65 into the hole 63 serving as the first positioning means 61 and fitting the bulging portion into the recess. As a result, the seven white keys 33 to 36,
43-45 are assembled in an array as shown in FIG.
A predetermined gap between the key 34 and the F key 44 (equal intervals in the longitudinal direction)
It is beautifully assembled with. Next, the black key unit 21 is overlaid from above the second white key unit 41. Positioning of both units is performed by fitting the projection 83 into the hole 81 and fitting the bulging portion and the recess in the same manner as described above. Thus, the first and second white key units 31 and 41 and the black key
Unit 21 in two directions, the key arrangement direction and the key longitudinal direction.
There is positioned on each other, after assembly is complete the keyboard unit 60 of an octave, assembling the entire frame 91 as shown in FIG. Screw 90 shown in FIG.
Are then screwed in to secure them. When a plurality of keyboard units 60 are arranged so as to form a plurality of octave keyboards on the frame 91, the positioning between adjacent low-pitched or high-pitched keyboard units 60 is performed in the second manner. This is performed by the positioning means 71. That is, as shown in FIG. 3, a hole 7 formed in the common mounting portion 52 at the position of the B key 36 of the first white key unit 31 for the keyboard unit 60 of a certain octave.
3 shows a C key 33 of the first white key unit 31 with respect to a keyboard unit 60 constituting an octave higher than that.
Positioning is performed by fitting a projection 75 protruding from the lower surface of the common mounting portion 52 at the position shown in FIG. As described above, a keyboard device having a plurality of octave keys 33 on the frame 91 can be assembled very easily. In this case, the positioning means 61, 71
Is located almost in the center in the key arrangement direction of the common mounting portion of each unit, which is the position where deviation and error are smallest in the resin molded product.
The error is small even in a portion where 3, 36 (34, 44) are adjacent to each other, and the appearance can be beautifully assembled. Further, when each key of the keyboard device is pressed, the first hinge portion 56 of the fulcrum portion 54 is bent up and down when the key body portion 50 is pressed, and swings up and down with the common mounting portion 52 as a fulcrum as a whole. I do. When a switch attached to a predetermined portion of the frame 91 is turned on, a predetermined musical sound is generated. The seven white keys constituting a one-octave keyboard are composed of a first white key unit integrally including an F key 44, an A key 45, a C key 33, and an E key 34, a G key 35, B key 3
6, the D key 43 may be divided into a second white key unit and a second white key unit. In this case, when the first white key unit and the second white key unit are combined to form a one-octave keyboard unit, first positioning means for positioning these white key units. Are arranged at the common mounting portions 52 (substantially central portions in the key arrangement direction of the common mounting portions) at the positions of the A key 45 and the B key 36 of these keyboard units. When a keyboard unit of one octave higher or lower than this one octave is arranged in parallel with this one octave keyboard unit, a second positioning means for positioning between the keyboard units of each octave is provided. Are arranged at the ends in the key arrangement direction of the common mounting portions of the keyboard units of each octave, that is, at the positions of the E key 34 and the F key 44. Further, as the first and second positioning means, both the projections and the holes are used, and the common mounting portions are vertically overlapped. However, the positioning means between the common mounting parts is not limited to these.
In addition, positioning means having another structure can be adopted.
For example, instead of the hole, a groove may be formed, and instead of the protrusion, a protrusion may be formed to be engaged with and fitted into the groove. Further, a corrugated uneven portion may be formed at the end of the common mounting portion so that the common mounting portions are engaged with each other in the left-right direction without overlapping in the vertical direction. Further, as the positioning means, a positioning engaging portion of each unit may be formed along the longitudinal direction of the key body portion, for example, at the common mounting portion. Needless to say, the shape, size, and the like of the engaging portion for positioning can be appropriately formed. Further, in this embodiment, 1 is used as the predetermined key range.
Although the octave key range has been described, this key range is not limited to one octave, but may be two octaves.
Alternatively, the entire keyboard may be used. As described above, according to the first aspect, in a keyboard device including a keyboard unit, when forming a keyboard unit, a plurality of black key units and white key units are used. Positioning can be performed accurately. That is, after the keyboard unit of the predetermined key range is formed, the keys are not irregular. In addition, even a non-expert can easily attach the black key unit and the white key unit to the frame of the keyboard device in an orderly key arrangement. Furthermore, since the common mounting portions of the black key unit and the white key unit are fitted by the fitting means formed by the unevenness, after the keyboard unit of a predetermined key range is formed, the black key unit and the white key unit are mutually moved in the key arrangement direction. And in the key longitudinal direction. Further, since the common mounting portion of the black key unit is superimposed on the common mounting portion of the white key unit, the fulcrum of the black key can be higher than the fulcrum of the white key, and the height of the black key is high. It is possible to reduce the forward and backward movement and sideward inclination during the operation of, and the above-mentioned positioning is also performed reliably, so that the tip of the black key contacts the adjacent white key or the side of the black key Rubbing between the sides of the adjacent white key is almost eliminated. Even if contact occurs , at least one of the white key and the black key is provided at the fulcrum.
The vertical key is bent in the horizontal direction without rolling. <br/> One of the keys can escape in the horizontal direction, causing squeak and squeak. There is no such thing as sex deterioration. According to the second invention, also in a keyboard device including a plurality of keyboard units adjacent to each other in the key arrangement direction, a key arrangement between the first key unit and the second key unit constituting each keyboard unit. Since the positioning in the two directions, the key direction and the key longitudinal direction, is performed by fitting the concave and convex as the first fitting means provided on the first and second common mounting portions which are overlapped with each other, the positioning work is easy. Can be performed with high accuracy. Further, since positioning between adjacent keyboard units is performed by the second fitting means which is fitted between the same key units of each keyboard unit, it is possible to easily and accurately maintain the continuity.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a principle diagram showing a schematic configuration of one embodiment of a keyboard device according to the present invention. FIG. 2 is an exploded perspective view showing a main part of a specific embodiment of the keyboard device according to the present invention. FIG. 3 is a sectional view taken along the line III-III in FIG. 2; FIG. 4 is a side view of a fulcrum portion and a vicinity of a common mounting portion in a state where a keyboard unit is formed by overlapping common mounting portions of the units of the embodiment shown in FIG. 2; FIG. 5 is a plan view showing a state in which the keyboard unit is attached to a frame. 6 is an enlarged longitudinal sectional view showing the vicinity of a fulcrum portion and a common mounting portion of the second white key unit shown in FIG. 2; FIG. 7 is a side view of the white key shown in FIG. 2; DESCRIPTION OF SYMBOLS 1... First plurality of keys, 2... Second plurality of keys, 3. 1 fulcrum, 4... 2 fulcrum, 5.
Common mounting parts, 7, 17: keyboard unit, 9: first keyboard unit, 11: second keyboard unit , 15: fitting means (positioning means), 19: unit fitting means, 21: black key unit, 23 ... C key, 24 ... D key, 25 ... F}
Key, 26 ... G key, 27 ... A key, 31 ... first white key unit, 33 ... C key, 34 ... E key, 35 ... G key, 36 ...
B key, 41 ... second white key unit, 43 ... D key, 44 ...
F key, 45 A key, 50 key body, 52 common mounting part, 54 fulcrum, 55 horizontal thin plate piece, 56 first hinge part, 57 vertical thin plate piece, 58 second hinge part , 60 ...
One octave keyboard unit, 61: first positioning means, 63, 81: holes, 65, 83 ... projections, 71: second positioning means, 73: holes, 75: projections, 84, 85, 8
6 ... long hole, 90 ... screw, 91 ... frame, 93 ... horizontal protrusion, 95 ... insertion hole

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 61-198996 (JP, U) JP-A 54-149824 (JP, U) JP-A 63-128593 (JP, U) 21708 (JP, B2) JP-B-57-3080 (JP, B1) JP-B-62-24799 (JP, B1) JP-B 38-5435 (JP, Y1) JP-B-41-20290 (JP, Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) G10H 1/34 G10B 3/12 G10C 3/12

Claims (1)

(57) [Claims] 1. A keyboard device including a keyboard unit, The keyboard unit fits the black key unit and the white key unit.
With means The black key unit is A plurality of black keys in a predetermined key range to be pressed; A first common arrangement for supporting each of the black keys so as to be able to swing up and down.
Attachment, A first fulcrum connecting the first common mounting portion and each of the black keys;
Parts and The white key unit is A plurality of white keys belonging to the predetermined key range; A second common key for supporting each of the white keys so as to be swingable in the vertical direction.
Attachment, A second fulcrum connecting the second common mounting portion and each of the white keys
Parts and The fitting means includes a first common mounting portion and a second common mounting portion.
The unevenness provided on the through mounting portion, the unevenness is the
Laying the first common mounting portion on the second common mounting portion
A predetermined key range by the white key unit and the black key unit.
It is used for positioning when forming a keyboard unit.
The first common mounting portion and the second common mounting portion are fitted to each other.
And A small number of first and second fulcrum portions provided on the white key and the black key
At least one isBetween the first common mounting portion and each of the black keys
Alternatively, a thin vertical key may be provided between the second common mounting portion and each of the white keys.
Having a plate piece, the black key or the white keyBend horizontally
A keyboard device characterized in that it can be operated. 2. The predetermined key range is one octave.
Item 2. The keyboard device according to Item 1.3. Provide multiple keyboard units adjacent to each other in the key arrangement direction
A keyboard device, The keyboard unit includes a first key unit and a second key unit.
And a fitting means. The first key unit is A key consisting of a part of keys belonging to a predetermined key range to be pressed
A plurality of keys, A first common attachment for swingably supporting the first plurality of keys;
Department and Connecting the first common mounting portion to the first plurality of keys;
A first fulcrum, The second key unit comprises: A second plurality of keys consisting of some keys belonging to the predetermined key area;
A key that is different from the first plurality of keys; A second common attachment for swingably supporting the second plurality of keys
Department and Connecting the second common mounting portion and the second plurality of keys;
A second fulcrum, The fitting means has a first fitting means and a second fitting means.
And The first fitting means includes the first common mounting portion and the first common mounting portion.
The unevenness provided on the second common mounting portion, the unevenness
Weights the second common mounting portion on the first common mounting portion.
The first key unit and the second key unit
When forming a keyboard unit in a predetermined key range by
The key arrangement direction and key longitudinal direction of each of these key units
Positioning in the direction, the first common mounting
Part and the second common mounting part are fitted to each other, The second fitting means includes a keyboard unit disposed adjacently.
Position by fitting the same key unit
Keyboard device having positioning means for performing
Place. 4. The predetermined key range is one octave.
Item 3. The keyboard device according to Item 3.