JP3528223B2 - 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 an improved mechanical structure for manufacturing a keyboard device for an electronic musical instrument at low cost.

[0002]

2. Description of the Related Art In keyboard devices for electronic musical instruments in recent years,
A general manufacturing method is to attach a component member for each key to the keyboard chassis and hold the keyboard chassis in a case. However, since the number of constituent members increases in proportion to the number of keys, resulting in an increase in manufacturing cost, it is difficult to manufacture at low cost.

A keyboard device for the above-described conventional electronic musical instrument will be described below with reference to the drawings.

FIG. 11 is a schematic sectional view showing a keyboard device of a conventional electronic musical instrument. In FIG. 11, 1 is a keyboard chassis,
Reference numeral 2 denotes a key, and a groove 2a formed at a rear end portion of the key is engaged with the keyboard chassis 1 so that each key is supported so as to be swingable up and down about the fulcrum. A compression coil spring 3 is provided between the keyboard chassis 1 and the key 2 and biases the key 2 upward. Reference numeral 4 denotes a rubber switch, which is fixed to the keyboard chassis 1 with screws 7 together with a printed wiring board 5 and a spacer 6. Rubber switch 4 is key 2 by pressing the key
The printed circuit on the printed wiring board 5 is made conductive by being pressed by the actuator portion 2b formed on the base plate 2 and sends a sounding signal to the main body. Reference numeral 8 denotes a key guide member which regulates the alignment of the keys 2. Reference numeral 9 is a key upper limit braking felt, and the key 2 is stopped at the key pressing start position, and 10 is a key lower limit braking felt, which is the key 2
Stop at the key pressing end position.

[0005]

However, in the above-mentioned conventional structure, since the constituent members for each key are attached to the keyboard chassis and the keyboard chassis is held in the case, it is proportional to the number of keys. Therefore, there is a drawback that the number of constituent members increases and the manufacturing cost increases.

The present invention solves the above-mentioned problems of the prior art by improving the structure in which the number of individual members to be manufactured is considerably smaller than in the prior art, and the workability is also greatly improved to reduce the number of manufacturing steps. It is also an object of the present invention to provide a keyboard device for an electronic musical instrument that can be manufactured at low cost by reducing

[0007]

In order to achieve this object, a keyboard device for an electronic musical instrument according to the present invention is provided with an opening formed by integrally molding a portion corresponding to a keyboard chassis with a case, and integrally forming a thin elastic band. At least 1 by connecting a plurality of keys connected to the common mounting portion via
An octave key group is formed, the rocking part of the key is exposed to the front of the case opening, and the common mounting part is mounted on the back of the case behind the case opening. A T-shaped projection for regulation is provided on the upper part of the common mounting part, and is fitted into the T-shaped groove provided on the back surface of the case, and the elastic tongue integrally formed with the case provided under the common mounting part is used for the common mounting. By urging the portion toward the back surface of the case, the key group can be attached with one touch, and the key group is held after the attachment so as not to fall off. Also, if a case opening that covers all of a plurality of key groups is formed, the strength of the case is significantly reduced.Therefore, set the gap of the adjacent portion of the common mounting portion larger than the gap of the key group.
In the gap where the key groups are adjacent to each other, a reinforcing rib that connects the rear side and the front side of the case opening can be formed. Also, so that the key group can also be used for the keyboard chassis of the conventional structure, the boss that penetrates downward and fits into the hole of the keyboard chassis in the common mounting part at the top of the key group, and holds the key group completely And a first locking claw for preventing mutual separation during work,
It has a configuration in which a second locking claw that allows the key group to be mounted on the keyboard chassis with one touch is provided.

[0008]

With this structure, the number of individual members to be manufactured can be improved to a structure that is considerably smaller than the conventional one, and the workability is greatly improved, and the number of manufacturing steps is also reduced.
It is possible to provide a keyboard device for an electronic musical instrument that can be manufactured at low cost.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of a black key of a keyboard device for an electronic musical instrument according to an embodiment of the present invention. In FIG. 1, 11
Is a black key, and the key parts for one octave C #, D #, F
Thin elastic band 1 with #, G #, A # scales provided for each key part
1a is integrally formed with the common mounting portion 11b, and the common mounting portion 11b is formed with a T-shaped alignment regulation projection 11c in the front-rear direction and a lateral alignment regulation projection 11d on the top of each key portion. There is.

FIG. 2 is a plan view of the first white key of the keyboard device of the electronic musical instrument according to the embodiment of the present invention. In FIG. 2, reference numeral 12 denotes a first white key, which is a thin elastic band 12 provided with key portions C, E, G, and B scales for one octave for each key.
It is integrally formed with the common mounting portion 12b via a.

FIG. 3 is a plan view of a second white key of the keyboard device of the electronic musical instrument according to the embodiment of the present invention. In FIG. 3, reference numeral 13 is a second white key, and the highest pitched key portion CC (C scale) in the keyboard specification of 61-key configuration with the key portions D, F, A for 1 octave is divided by the mold partition line Z. What can be additionally molded as a boundary is integrally molded with the common mounting portion 13b through the thin elastic band 13a provided for each key. The key part CC formed is used only at the highest octave position of the product.

FIG. 4 is a diagram in which the black key, the first white key, and the second white key in the YY cross section of FIG. 3 are superimposed. In FIG. 4, 11e is a boss provided on the common mounting portion 11b, which penetrates 12b and 13b to perform positioning during superposition. In addition, the keyboard chassis 14 is provided with keys 11, 12, 1
When attaching 3, the positioning is performed by penetrating the keyboard chassis. Reference numeral 13c denotes a screwing hole provided in the common mounting portion 13b, which penetrates 11b and 12b.

FIG. 5 is a sectional view taken along line XX of FIG. In FIG. 5, reference numeral 11f denotes a first locking claw provided on the common mounting portion 11b, which locks the keys 12b and 13b in a superposed state and holds the key groups 11, 12, and 13 completely.

FIG. 6 is a sectional view taken along the line WW of FIG. In FIG. 6, reference numeral 11g denotes a second locking claw provided on the common mounting portion 11b, which is a key group 1 which is already superposed and integrated.
The keys 1, 12, and 13 are locked and held by the keyboard chassis 14.

FIG. 7 is a schematic sectional view of a keyboard device for an electronic musical instrument according to an embodiment of the present invention. In FIG. 7, reference numeral 15 is a case, which is provided with T-shaped grooves 15c and 15d into which the T-shaped projections 11c and 11d of the black keys are fitted from below, and screws 16
Common mounting parts 11b, 1 of the key groups 11, 12, 13
2b and 13b are fixed to the boss 15a. In this embodiment,
Since the case 15 and the key groups 11, 12, and 13 have different die removal directions (the key is horizontal and the case is inclined), the common mounting portion 13b of the key 13 has a screw seat surface 13d perpendicular to the case die removal direction. Is provided. Reference numeral 15b denotes a keyboard base integrally formed with the case 15, and the printed wiring board 17 can be held only by mounting the printed wiring board 17 from the V direction by the positioning bosses 15e for the printed wiring board and the locking claws 15f provided at the bottom.
Secure with screws 18. 15g is keyboard base 15b
Is a keyboard base support boss provided for each octave in the lower part of, and is fixed to the bottom plate 20 by screws 19 to secure the flatness of the keyboard base 15b. Reference numeral 21 denotes a rubber switch that is inserted between the keyboard base 15b and the printed wiring board 17, and is depressed by an actuator portion 13e formed in common for each key by pressing a key, and a conductive rubber contact 21a is insert-molded inside. , 21b printed on the upper surface of the printed wiring board 17 with conductive contacts 17a, 17b.
Send a sound signal to the main circuit by touching b. The time difference until the two conductive rubber contacts 21a and 21b contact each other is calculated to make the sounding volume proportional to the key pressing speed.
Further, the key 13 is biased to the key pressing start position by its own elastic force, and plays the role of a compression coil spring in the conventional structure. Reference numeral 15h is a key guide portion provided for each key on the keyboard base 15b, and regulates the alignment of the keys 13. Reference numeral 22 is a key upper limit braking felt attached to the lower part of the keyboard base 15b in common for each key, and stops the key 13 at the key pressing start position.
Reference numeral 23 denotes a key lower limit braking felt attached to the upper part of the keyboard base 15b for all keys in common, and stops the key 13 at the key pressing end position.

FIG. 8 shows the key groups 11, 12, and 13 in FIG.
It is a figure which shows the operation | movement which equips a case with. In FIG. 8, reference numeral 15i denotes the keyboard base 1 in the opening T area of the case 15.
5b is an elastic tongue projectingly formed, and a common mounting portion 11 of the key groups 11, 12, 13 formed by S smaller than the opening T
b, 12b, 13b from the Q direction, and elastic tongue 15i
T-shaped projection 11 like P while elastically deforming downward
The c and 11d are fitted into the T-shaped grooves 15c and 15d. After mounting the key groups 11, 12, and 13 on the case, as shown in FIG. 7, the fitting length N of the T-shaped projections 11c and 11d is
Since it is larger than the gap M between the elastic tongue 15i and the common mounting portion 13b of the key group 13, the key groups 11, 12, and 13 do not fall out of the case 15. The elastic tongue 15i is provided at two places (below the D key and the A key) in the one octave key arrangement, and a stable mounting operation and a key group drop prevention effect can be obtained.

FIG. 9 is a plan view of the keyboard device of the electronic musical instrument according to the embodiment of the present invention as viewed from the direction of arrow L in FIG. Figure 9
15j is the keyboard base 15 in case 15
b is a connecting rib that connects the rear side of the opening T with the opening T and divides the opening T in units of one octave to reinforce the case, and is more common than the adjacent gap K of the key groups 11, 12, and 13 relative to the common mounting portion 1.
The adjacent gaps J of 1b, 12b, and 13b are set to be large so that a wall thickness of approximately the same size as the gap J can be formed. That is, since the connecting rib 15j is below the key 13 in FIG. 7, the wall thickness of the connecting rib 15j in FIG. 9 can be made larger than the adjacent gap K between the key groups 11, 12, and 13. If the connecting rib 15i is not provided, the opening T extends to the region including all of the plurality of key groups 11, 12, and 13, so that the strength of the case 15 is significantly reduced.

FIG. 10 is a schematic cross-sectional view of a keyboard device for an electronic musical instrument according to an embodiment of the present invention when the keys 11, 12, and 13 are attached to a conventional keyboard chassis 14. In FIG. 10, the key mounting portion 14 a of the keyboard chassis 14 is a key group 1
Formed at a right angle to the die removal direction of 1, 12, 13
Key groups 11, 12 previously held by the locking claw 11g,
The common mounting portions 11b, 12b, 13b of 13 are fixed with screws 24 from above. Reference numeral 21 denotes a rubber switch, which is inserted between the keyboard chassis 14 and the printed wiring board 25 and fixed to the keyboard chassis 14 by screws 26. Unlike the conventional structure, the rubber switch 21 in this case can bias the key 13 to the key pressing start position by its own elastic force, so that the compression coil spring can be eliminated. Reference numeral 27 denotes a key guide member attached to each protrusion on the keyboard chassis 14 for each key, and regulates the alignment of the keys 13. Reference numeral 28 denotes a key upper limit braking felt attached to the lower part of the keyboard chassis 14 in common for each key, and stops the key 13 at the key pressing start position. Reference numeral 29 denotes a key lower limit braking felt attached to the upper part of the keyboard chassis 14 for each key in common.
3 is stopped at the key pressing end position.

As described above, according to the present embodiment, a portion corresponding to the conventional keyboard chassis is integrally formed with the case to provide an opening, and is integrally formed and connected to the common mounting portion via the thin elastic band. By stacking multiple keys in multiple stages, a key group of at least 1 octave is formed, the swinging part of the key is exposed to the front of the case opening, and the common attachment part is attached to the back of the case behind the case opening. With the structure
A T-shaped protrusion that regulates the alignment of the keys in the left-right and front-rear direction is provided on the upper portion of the common mounting portion, and is fitted into the T-shaped groove provided on the back surface of the case, and is integrally molded with the case provided below the common mounting portion. The elastic tongue urges the common mounting portion toward the rear surface of the case, so that the key group can be mounted with one touch, and the key group can be held and prevented from falling after mounting. Also, if a case opening that covers all of a plurality of key groups is formed, the strength of the case will be significantly reduced. Therefore, the gap between adjacent parts of the common mounting part should be set larger than the gap between adjacent key groups. In the gap adjacent to each other, a reinforcing rib that connects the rear side and the front side of the case opening can be formed. In addition, a boss that penetrates downwards and fits into a hole in the keyboard chassis in a common mounting portion at the top of the key group, and a first boss for completely retaining only the key group and preventing mutual separation during work. By providing the locking claw and the second locking claw that allows one-touch mounting of the key group to the keyboard chassis, only the key group can be integrated in advance, and the key group can also be used in the keyboard chassis of the conventional structure. Even for a product in which the chassis cannot be integrally formed with the case, the number of man-hours for attaching the key is small, and a keyboard device with good workability can be provided.

[0021]

As described above, according to the present invention, a portion corresponding to a conventional keyboard chassis is integrally molded with a case to provide an opening, and a plurality of members are integrally molded and connected to a common mounting portion through a thin elastic band. By stacking multiple keys in multiple steps, a key group of at least 1 octave is formed, the swinging part of the key is exposed to the front of the case opening, and the common attachment part is attached to the back surface of the case behind the case opening. In addition to the structure, a T-shaped protrusion that regulates the alignment of the keys in the left-right and front-rear direction is provided on the upper portion of the common mounting portion, and is fitted into the T-shaped groove provided on the back surface of the case, and is provided below the common mounting portion. By pressing the common attachment part toward the back of the case with the elastic tongue integrally formed with the case, the key group can be attached with one touch, and the key group can be held even after attachment so that it does not fall off. Fewer key installation steps Of course the workability is good, such as Okeru previously prepared mounting of key group in the case, also has the advantage of flexibility in the layout of the manufacturing process is increased. Also, if a case opening that covers all of a plurality of key groups is formed, the strength of the case will be significantly reduced. Therefore, the gap between adjacent parts of the common mounting part should be set larger than the gap between adjacent key groups. Form a reinforcing rib for connecting the rear side and the front side of the case opening in the adjacent gap. As a result, the strength of the case can be secured, the conventional keyboard chassis can be abolished and it can be integrally molded with the case, and the parts cost and the die cost can be significantly reduced. In addition, a boss that penetrates downwards and fits into a hole in the keyboard chassis in a common mounting portion at the top of the key group, and a first boss for completely retaining only the key group and preventing mutual separation during work. By providing the locking claw and the second locking claw that allows the key group to be mounted on the keyboard chassis with one touch, only the key group is prepared in advance.
The degree of freedom in layout of parts distribution form and manufacturing process is increased, and the key group can be used for the keyboard chassis of the conventional structure, so that the key chassis can be attached to the product even if the keyboard chassis cannot be formed integrally with the case. It is possible to provide a keyboard device with a small number of man-hours and good workability.

[Brief description of drawings]

FIG. 1 is a plan view of a black key of a keyboard device for an electronic musical instrument according to an embodiment of the present invention.

FIG. 2 is a plan view of a first white key of a keyboard device for an electronic musical instrument according to an embodiment of the present invention.

FIG. 3 is a plan view of a second white key of the keyboard device of the electronic musical instrument according to the embodiment of the present invention.

4 is a black key, a first white key in the YY cross section of FIG. 3, FIG.
The figure which overlapped the second white key

5 is a sectional view taken along line XX of FIG.

6 is a cross-sectional view taken along the line WW of FIG.

FIG. 7 is a schematic sectional view of a keyboard device for an electronic musical instrument according to an embodiment of the present invention.

FIG. 8 is a diagram showing an operation of mounting the key group in the case in FIG.

FIG. 9 is a plan view of a keyboard device for an electronic musical instrument according to an embodiment of the present invention.

FIG. 10 is a schematic sectional view of a keyboard device for an electronic musical instrument according to an embodiment of the present invention.

FIG. 11 is a schematic sectional view of a keyboard device of a conventional electronic musical instrument.

[Explanation of symbols]

11 black key 11b Black key common mount 11c, 11d T-shaped protrusion 11f First locking claw 11g Second locking claw 12 first white key 12b Common mounting part for the first white key 13 second white key 13b Second white key common mounting part 14 keyboard chassis 15 cases 15c, 15d T-shaped groove 15i elastic tongue 15j Connecting rib 17 Printed wiring board 21 rubber switch

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Claims (3)

(57) [Claims] 1. A key group of at least one octave is formed by stacking a plurality of keys, which are integrally molded and connected to a common mounting portion via a thin elastic band, in multiple stages, and the rocking portion of the key is formed. In a keyboard device of an electronic musical instrument, which is exposed to the front from a case opening and has the common mounting part mounted on the back surface of the case behind the case opening, a T-shaped protrusion for restricting alignment of the keys in the left-right and front-back directions is provided. An elastic tongue integrally formed with the case is provided below the common mounting portion, the elastic tongue being provided above the common mounting portion and fitted in the T-shaped groove provided on the back surface of the case. A keyboard device for electronic musical instruments characterized by being biased in the direction. 2. A key group of at least 1 octave is formed by stacking a plurality of keys, which are integrally molded and connected to a common mounting portion via a thin elastic band, in multiple stages, and the rocking portion of the key is formed. In a keyboard device of an electronic musical instrument, which is exposed to the front from a case opening and has the common mounting portion mounted on the back surface of the case behind the case opening, the maximum width of the common mounting portion is larger than the maximum width of the exposed portion of the key group. Is set to be small, and the case opening is divided in the gap where the key groups are adjacent to each other, and the case opening is divided to reinforce the case. 3. A key group of at least 1 octave is formed by stacking a plurality of keys, which are integrally molded and connected to a common mounting portion via a thin elastic band, in multiple stages, and the common mounting portion is a keyboard chassis. In a keyboard device for an electronic musical instrument mounted on a keyboard, a boss that penetrates downwards and fits into a hole of the keyboard chassis and a common holding portion at the uppermost stage of the key group, and holds only the key group completely. A keyboard device for an electronic musical instrument, comprising: a first locking claw for holding the key group and a second locking claw for holding the key group on the keyboard chassis.