JP5186882B2 - Electronic musical instrument keyboard device - Google Patents

Description

  The present invention relates to a keyboard device for an electronic musical instrument having a mass body that rotates in conjunction with a key pressing operation.

2. Description of the Related Art Conventionally, there is an electronic musical instrument keyboard device that obtains a key touch feeling similar to that of an acoustic piano keyboard mechanism by rotating a mass body in conjunction with a key pressing operation.
In the keyboard device for an electronic musical instrument described in Patent Document 1, the frame is integrally formed of synthetic resin, and a horizontal plate, an inclined plate, and a mounting plate (rear base) are extended in the key arrangement direction. These are connected to each other by a plurality of ribs extending in the longitudinal direction of the key.
A long lower plate is fixed to a step portion formed at the front end of the mounting plate of the frame. The lower plate is formed by laminating a rubber plate and a resin board, and a long lower limit stopper is fixed to the front projecting portion.
A frame is formed at the rear end of the horizontal plate, the rear end (key fulcrum) of the key body is accommodated in the frame, an upper surface plate is formed above the rear portion of the frame, and the lower surface of the upper plate is A long upper limit stopper is fixed.
The bent portion (mass concentration portion) of the swing lever (mass body) extends further to the rear than the rear end of the key body portion. The swing lever rotates between a position where the bent portion of the weight contacts the lower limit stopper and a position where the bent portion contacts the upper limit stopper.

  Since the keyboard device of an electronic musical instrument has no string-striking mechanism, it can be made smaller in both depth and height than an acoustic piano. However, as the depth becomes smaller, the distance from the key pressing position to the key fulcrum portion becomes shorter. When the distance from the key pressing position to the key fulcrum portion is shortened, a heavy touch occurs when the key is pressed behind the key (key fulcrum side), in other words, the reaction force increases. On the premise that the key stroke length during the key pressing operation is the same as that of the acoustic piano, the key rotation angle is larger than that of the acoustic piano. These points are one of the factors that cause a difference in operation feeling between an electronic keyboard instrument and an acoustic piano.

Further, in the case of an electronic keyboard instrument using a mass body, there is a problem that it is difficult to insert the mass body into the frame at the time of assembly.
In the keyboard device of the electronic musical instrument described in Patent Document 1 described above, when the swing lever (mass body) is assembled to the key frame, the swing lever is inserted obliquely downward from the back with the frame turned upside down. The cylindrical portion (rotating fulcrum portion) is fitted to the rotating support portion.
At this time, although the lower plate to which the lower limit stopper is fixed is attached later, the frame mounting plate (rear base) extends in the key arrangement direction, so that the bent portion is easily caught when the swing lever is inserted. There is a problem that the assemblability is not good.
In Patent Document 1 described above, since the rotation support portion to which the cylindrical portion of the swing lever is attached is located at the rear end of the inclined plate, when the frame is turned upside down, the upper portion is open. The assemblability is ensured. However, in the case of an electronic keyboard instrument having a frame that does not open upward, the assemblability is further reduced.
JP 9-244623 A (Patent No. 3060938)

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a keyboard device for an electronic musical instrument having good assemblability in a keyboard device having a mass body.

In the present invention according to claim 1, a plurality of keys, a plurality of mass bodies that rotate in conjunction with a key pressing operation of each key, and a plurality of key support portions are juxtaposed rearward. A plurality of mass body support portions are fixed below the plurality of keys and fixed to the frame side, and the upper limit of the rotation range of the mass body is regulated by the collision of the mass bodies. Electronic musical instrument keyboard having an upper limit operation restricting member and a lower limit operation restricting member that is attached and fixed to the frame side in the key arrangement direction and restricts the lower limit of the rotation range of the mass body by colliding with the mass body In the apparatus, the frame includes a plurality of long portions including a front base portion and a rear base portion , and a plurality of vertical ribs, and the plurality of long portions extend in an arrangement direction of the plurality of keys, It said plurality of vertical ribs, including said front base and the rear base portion Said plurality of at least a portion of the elongated portion, connected to each other, the plurality of vertical ribs said gap masses are arranged in the arrangement direction of the plurality of keys so as to rotate, the plurality of Each lower end surface of the vertical rib is in an independent state at an intermediate portion between the front base portion and the rear base portion, and the lower limit operation restricting member is below each of the plurality of vertical ribs at the intermediate portion. It is an end face, and is fixedly attached to a portion that is partially wider than the width of the vertical rib in the key arrangement direction, and the frame includes at least the front base, the rear base, and the lower limit. It is supported by the operation restricting member .

Since the lower limit operation restricting member is not integrated with the frame, it is attached and fixed to the vertical rib after the mass body is inserted. The portion to which the lower limit operation restricting member is attached and fixed is a portion where the long portion connected in the key arrangement direction by a plurality of vertical ribs is not provided in the vicinity, in other words, separated from the long portion. It is a part. In this portion, the vertical ribs are in an independent state. Therefore, when the mass body is inserted between the vertical ribs, the lower limit operation restricting member and the long portion do not become an obstacle to insertion. The above-described portion is, for example, in the vicinity of the intermediate position in the key longitudinal direction.
The lower limit operation restricting member described above may be a lower limit stopper itself formed of an operation restricting material, or such a lower limit stopper is fixed to an attachment member, for example, an attachment plate that is long in the key arrangement direction. It may be.

In addition , it is possible to increase the bonding area between the lower limit operation restricting member and the vertical rib while maintaining the independence of the vertical ribs at the lower end surfaces of the plurality of vertical ribs to which the lower limit operation restricting member is fixed. The lower limit operation restricting member can be stably attached to the vertical rib.
When the lower limit operation restricting member is fixed to the lower end surfaces of the plurality of vertical ribs by adhesion or adhesion using an adhesive or a double-sided adhesive tape, the fixing strength is increased.
As a specific structure for partially expanding the lower end surface of the vertical rib more than the width of the vertical rib, there is provided a lower end surface that is widened from the vertical rib in the key arrangement direction, or in the vicinity of the lower end surface of the vertical rib. A plurality of orthogonal ribs projecting from the ribs in the key arrangement direction may be provided, and the lower end surfaces of the plurality of orthogonal ribs may be added to partially widen the lower end surface of the vertical ribs.
According to a second aspect of the present invention, in the electronic musical instrument keyboard device according to the first aspect, the lower limit operation restricting member is fixed to a mounting member whose lower limit stopper is long in the key arrangement direction. Yes, and fixed by the mounting member to the portion that is partially wider than the width of the vertical rib.

The keyboard device according to the first and second aspects described above is realized by the following specific configuration, for example.
Of the plurality of long portions, the long portion located below the plurality of key support portions serves as the rear base of the key frame. The upper limit movement restricting member is, in one of the plurality of long portions, located in the middle of the key longitudinal direction which is behind the key longitudinal position of the mass support portion and forward of the key longitudinal position of the key support portion. Fixed in position. The lower limit operation restricting member is located in the vicinity of the intermediate position in the key longitudinal direction.
Therefore, the free end portion of the mass body is also located near the intermediate position in the key longitudinal direction. The key support part and the rear base part are located rearward of this. Moreover, the mass body support part is arranged in parallel at the front side below the plurality of keys.
As a result, the length from the tip of the key to the key support is longer than from the mass support to the free end of the mass. In general, when the length from the rotation fulcrum portion to the free end of the mass body is increased, the thickness (height direction) of the keyboard device increases with an increase in the stroke of the mass body, which is not preferable for downsizing. On the other hand, it is not as difficult as a mass body to lengthen from the tip part of a key to a key fulcrum. Accordingly, it is possible to realize a keyboard device for an electronic musical instrument having a mass body and a key length adapted to a difference in length allowed for the mass body and the key.
Further, when viewed in the longitudinal direction of the key, the distance from the mass body support portion to the rear base is longer than the length from the mass body support portion to the free end. Therefore, when the mass body is inserted obliquely from the rear between adjacent vertical ribs and attached to the mass body support portion, the long portion formed with the rear base does not become an obstacle.

According to the present invention, the lower limit operation restricting member is attached and fixed to the frame by the attaching member which is a separate member from the frame, and the vertical ribs are independent from each other in the attached and fixed portion. Therefore, there is an effect that the assemblability of the keyboard device is improved.
Furthermore, if the length of the key is longer than the length of the mass body, the length of the key and the length of the mass body can be adapted to the tolerance of the length for the key and the mass body. For example, the distance from the tip of the key to the key fulcrum is made longer than before while keeping the length of the free end from the rotation fulcrum of the mass body as before. The closer the overall length of the key is to the full length of the key of the acoustic piano, the smaller the key swing angle than the conventional electronic keyboard instrument, and the key stroke and the key rotation angle at the key pressing position can be reduced. Can be close to the key. As a result, an operational feeling close to that of an acoustic piano key can be obtained, so that the operational feeling is improved.

FIG. 1 is a right side view schematically showing a keyboard apparatus for an electronic musical instrument which is an embodiment of the present invention. FIG. 1A shows a state where the key is not pressed (key release state), and FIG. 1B shows a state where the white key main body 1 has been pressed.
In FIG. 1A, 1 is a white key body, 2 is a black key body, 3 is a key frame, 4 is a key frame bottom plate, and 8 is a mass body.
The white key main body 1 and the black key main body 2 have a total length longer than that of a key of a general electronic keyboard instrument as described in Patent Document 1.
The upper case 18 is covered behind the rear end of the black key body 2 that protrudes above the key surface of the white key body 1.

The lengths of the white key body portion 1 and the black key body portion 2 that are not covered by the upper case 18 are conventionally defined in consideration of an acoustic piano. Accordingly, the white key main body 1 and the black key main body 2 have a length on the key fulcrum side covered with the upper case 18 (the portion where the black key main body 2 protrudes above the key surface of the white key main body 1). By making the length from the rear end to the key fulcrum portion longer than that of the conventional electronic keyboard instrument, the total length is made close to or the same as the total length of the key of the acoustic piano. The rear end of the visible portion is the substantially central position of the white key main body 1 (approximately half of the keyboard surface).
With the above-described configuration, not only the key stroke at the key pressing position but also the key rotation angle can be set to a value close to that of an acoustic piano.

The key frame 3 has a plurality of long portions and a plurality of vertical ribs.
The plurality of long portions is, for example, a flat plate having a predetermined thickness, and extends in the arrangement direction of a plurality of keys (a plurality of white key main body portions 1 and a plurality of black key main body portions 2). To do.
The plurality of vertical ribs have, for example, a thin plate shape that extends in the longitudinal direction and the vertical direction of the key, and connect (bridge) at least a part of the plurality of long portions.
As a result, the plurality of vertical ribs reinforce the plurality of long portions and connect the plurality of long portions to each other in the longitudinal direction and the vertical direction of the key, thereby realizing a lightweight and strong key frame 3. The

In a gap between adjacent vertical ribs, the mass concentration portion 8e, which is a free end, rotates between a position where it abuts on the lower limit stopper 12 and a position where it abuts on the upper limit stopper (upper limit operation restricting member) 15. The plurality of vertical ribs are arranged in a plurality of key arrangement directions so as not to interfere with the rotation of the mass bodies 8 at a predetermined gap position where a plurality of mass bodies 8 arranged in parallel in the key arrangement direction are adjacent to each other. Are installed side by side. Here, the predetermined gap position is, for example, a gap position where the white key and the white key are adjacent to each other.
Such a key frame 3 is at least partially made of synthetic resin and can be integrally molded. The key frame 3 may be a combination of synthetic resin and a material other than synthetic resin such as sheet metal.

  In the following description, in order to explain the structure of the key frame 3, a plurality of long portions, and members standing on the long portions in the key arrangement direction corresponding to each key or mass body are provided. On the other hand, the code | symbol 3 which uses the capital letter of an alphabet as a subscript is attached | subjected. Moreover, the code | symbol 3 which attaches the small letter of an alphabet to the specific part in one vertical rib is attached | subjected.

The front upper mounting portion 3A is a long portion positioned in front of the upper portion and serves as a front top surface. On the other hand, the rear upper mounting portion 3B, which is a long portion positioned rearward of the upper portion, is spaced apart rearward in the longitudinal direction of the key, and becomes the key frame rear top surface.
The plurality of key support portions 3C are formed in the vicinity of the rear end of the upper surface of the rear upper mounting portion 3B so as to correspond to the plurality of white key main body portions 1 and the plurality of black key main body portions 2, respectively. Supports swingable in the key direction.

In the illustrated example, the key support portion 3C is located in the left and right side walls of each key, and the shaft portion protrudes to the left and right in the key arrangement direction. The key fulcrum part 1b (through hole) provided in the is fitted. The same applies to the black key main body 2, and the key fulcrum 2 b (through hole) is fitted to the shaft protruding from the support.
The support structure of the white key main body 1 and the black key main body 2 may be replaced with another configuration that does not depend on the key fulcrum (through hole) and the shaft as shown in the figure.
On the other hand, the mass body support portion 3D is erected on the lower surface of the front upper mounting portion 3A and below the plurality of keys, and interlocks with the corresponding key (white key body portion 1 in the illustrated example). The mass body 8 is supported so as to rotate about the mass body rotation fulcrum 8c in a direction corresponding to the pressing / releasing key direction.

There is a vertical wall portion 3E that is spaced downward from the front end of the front upper mounting portion 3A. There is a front base 3F forward from the lower end. The front base portion 3F is supported by the key frame bottom plate 4 via a buffer member (cushion member) 14.
A vertical wall 3G is erected from the front of the front base 3F. A key guide 5 is erected on the top surface. The key guide 5 is inserted between the left and right side walls of the tip 1a of the white key main body 1. On the other hand, the key guide 6 for the black key body 2 is erected on the upper surface of the front upper mounting portion 3A.
The lower part of the tip part 1a of the white key main body part, the key guide 5, the vertical rib 3f described later, and the front surface of the key frame bottom plate 4 are covered with a mouth bar part 9. Reference numeral 10 denotes a holding metal fitting which is attached to the mouth bar portion 9 and is in contact with the upper end of the vertical rib 3f described above.

On the other hand, the rear end of the rear upper mounting portion 3B is connected to the front end of the rear base (bottom surface) 3I via a step portion 3H having a vertical wall shape. The plurality of key support portions 3C are erected near the rear end of the upper surface of the rear upper mounting portion 3B. Accordingly, the rear base 3I is located below the plurality of key support portions 3C.
The upper limit stopper (upper limit operation restricting member) 15 is located at the rear end of the lower surface of the front upper mounting portion 3A behind the key longitudinal direction position of the mass body support portion 3D and ahead of the key longitudinal direction position of the key support portion 3C. The key is fixed at an intermediate position in the longitudinal direction.
The lower limit stopper 12 is fixed in advance to the front projecting portion of the long mounting plate 11 in the key arrangement direction. The lower limit stopper 12 fixed to the mounting plate 11 is the lower limit operation restricting member. As the mounting plate 11, the same one as the lower plate in Patent Document 1 can be used.
The attachment plate 11 is attached and fixed to the lower end surface 3d of the vertical rib described later so that the lower limit stopper 12 is positioned in the vicinity of the intermediate position in the key longitudinal direction described above. In the illustrated example, the upper limit stopper 15 is in the key longitudinal direction position near the lower limit stopper 11 in the longitudinal direction of the key.

A plurality of through holes 16 (see FIG. 2) are formed in the center of the front upper mounting portion 3A. The through hole 16 is for inserting a mold for forming an intermediate base 3g described later when the key frame 3 is integrally formed.
A plurality of key switches 17 are disposed on a circuit board (not shown) in a portion where the through hole 16 is not provided in the center of the upper mounting portion 3A. Opposite each key switch 17, a protrusion (actuator) is provided downward from the upper surface rear side (ceiling surface) in the key internal space of the white key main body 1 and the black key main body 2.
A force transmission portion 1c extends downward from the lower ends of the left and right side walls of the white key main body near the tip portion 1a. The tip of the force transmission portion 1c has a bottom plate, and the upper portion of the bottom plate penetrates in the longitudinal direction of the key. Elastic members 7 are fixed to the upper and lower surfaces of the bottom plate.

On the other hand, the force transmitting portion of the black key main body 2 is not shown, but the front end 2a of the black key main body extends downward and then moves forward, and the force transmitting portion 1c extends in the key arrangement direction. Overlapping position. Similarly, the black key main body 2 is provided with a similar mass body that is rotatably supported by the mass body supporting portion, and is engaged via the bottom plate of the corresponding black key force transmitting portion and the elastic member. Match.
The white key main body 1 and the black key main body 2 are restored by their own weights, but the white key main body 1 is interposed between the white key main body 1 and the black key main body 2 and the key frame 3. A return spring for returning the part 1 and the black key body part 2 to the key release position may be provided.

In one vertical rib, the vertical rib 3a connects the rear upper mounting portion 3B, the stepped portion 3H, and the front upper mounting portion 3A to each other. The lower end surface of the vertical rib 3a has a shape cut out upward between the front end of the rear base 3I and the intermediate base 3b. The vertical rib 3a contacts the key frame bottom plate 4 at the intermediate base 3b.
On the other hand, the vertical rib 3a has an upper end surface 3c having a step at the rear portion of the front upper mounting portion 3A, and a predetermined height or more is cut out, and the upper end surface 3c rises and the rear upper mounting portion 3B. Is bound to.
The vertical rib 3 a is formed so as to be separated from the upper limit stopper 15. In the illustrated example, the vertical rib 3a is separated from the upper limit stopper 15 by a gap d1 in the longitudinal direction of the key and a gap d2 in the vertical direction. Since the vertical rib 3a does not compress the upper limit stopper 15, the operation restriction function of the upper limit stopper 15 is not impaired. When the upper limit stopper 15 is a long member, a gap d2 is required when the upper limit stopper is assembled.

The attachment plate 11 is attached and fixed to the lower end surface 3d of the vertical rib adjacent to the front of the intermediate base 3b and having a step in the upward direction. The height of the step described above corresponds to the thickness of the mounting plate 11.
The intermediate base 3b is not essential, but the mounting plate 11 can be positioned by a step with the intermediate base 3b.
The lower end surface 3d of the vertical rib is supported by the key frame bottom plate 4 with the mounting plate 11 interposed therebetween.
The vertical rib 3a has a lower end surface 3e having a step difference adjacent to the front of the lower end surface 3d. The lower limit stopper 12 is positioned directly below the lower end surface 3e.
In the illustrated example, as shown in FIG. 1B, the vertical rib 3a is separated from the lower limit stopper 12 by a gap d3 in the longitudinal direction of the key and by a gap d4 in the vertical direction. However, the two do not necessarily need to be separated.

In the illustrated example, the lower limit stopper 12 is fixed to the long mounting plate 11. Instead of this, a combination of the lower limit stopper 12 and the mounting plate 11 may be integrally formed of an operation restricting material, and this may be used as a lower limit operation restricting member.
Alternatively, without using an attachment member such as the attachment plate 11, the lower limit stopper 12 may be used alone as a lower limit operation restricting member, and this may be attached and fixed to the lower end surface of the vertical rib. In this case, the position where the illustrated lower end surface 3e is lowered by the length of the gap d4 is changed to the lower end surface 3d, and a lower limit stopper 12 having a height obtained by adding the thickness of the mounting plate 11 is attached and fixed to the lower end surface 3d. The lower surface of the lower limit stopper 12 contacts the frame bottom plate 4 after the assembly is completed.

In the example shown in the figure, the position immediately below the rear end of the front upper mounting portion 3A is located at the front end of the lower end surface 3d of the vertical rib to which the mounting plate 11 is attached. , Does not overlap in the longitudinal direction of the key.
Therefore, as will be described later, even when the lower end surface 3d of the vertical rib is widened in the key arrangement direction, the lower end surface 3d can be molded with a mold.
The vertical rib 3f is located between the lower end surface 3e and the front intermediate base 3g, and has a lower end surface that is notched upward, and the upper end surface is coupled to the front upper mounting portion 3A. The intermediate base 3g is a lower end surface of a vertical rib supported by the key frame bottom plate 4 via the buffer member 13.

The vertical rib 3h is in front of the intermediate base 3g and has a lower end surface that is notched upward from the vertical wall 3E. The vertical wall 3E, the front base 3F, and the vertical wall 3G and the front upper attachment part 3A are connected. The upper end surface of the vertical rib 3h is inclined downward from the front end of the front upper mounting portion 3A to the upper portion of the vertical wall portion 3G.
The vertical ribs 3f and 3h are notched downward at the upper end surface below the through hole 16 formed in the front upper mounting portion 3A.
The vertical rib 3i is provided forward and downward from the middle part of the vertical wall 3G. The lower end surface of the vertical rib 3i is supported by the key frame bottom plate 14 via the buffer member (cushion member) 14 together with the front base 3F, and the upper end surface is pressed. It is in contact with the metal fitting 10.

The length from the rotation fulcrum portion 8c of the mass body to the rear end of the mass concentration portion 8e is the same length as that of the mass body of a general electronic keyboard instrument.
Since the rotation angle range of the mass body 8 cannot be freely changed in relation to the key stroke or the like, if the length from the rotation fulcrum portion 8c of the mass body to the rear end of the mass concentration portion 8e is increased, The stroke length at the end increases, and the keyboard device must be raised vertically.
Further, if the length from the rotation fulcrum portion 8c of the mass body to the rear end of the mass concentration portion 8e becomes longer, there is interference such as collision between adjacent mass bodies due to deformation or variation during the mass body 8 manufacture. Cannot be rotated. Therefore, it is not preferable to lengthen the mass body from the pivot point to the free end.
On the other hand, the white key main body 1 and the black key main body 2 have a key tip portion that is caused by post-contraction or the like during molding if the length from the key tip portion 1a, 2a to the key fulcrum 1b, 2b is increased. It becomes easier to deform left and right. However, if the white key main body 1 and the black key main body 2 are designed to move to the left and right, the position is regulated by the key guides 5 and 6, so that deformation is not a problem as much as the mass body 8. .

The lower limit stopper 12 and the upper limit stopper 15 are arranged and fixed at an intermediate position in the key longitudinal direction in accordance with the difference in the length of the key and the mass body.
The lower limit stopper 12 and the upper limit stopper 15 are generally arranged in a band shape along the key arrangement direction, and may be common to all keys or a plurality of keys in units of one or several octaves. it can.

Each mass body 8 corresponds to each of the plurality of white key main body portions 1 and the black key main body portion 2 and rotates in conjunction with each key pressing operation. The illustrated mass body 8 is for the white key body 1.
The mass body 8 has a bifurcated portion 8c supported by the mass body support portion 3D and a bifurcated portion in front of the rotational fulcrum portion 8c and engaged with the key force transmission portion 1c via the elastic member 7. Main driven portion 8a and sub driven portion 8b, and a mass concentrating portion 8e as a free end portion via a connecting portion 8d behind the rotation fulcrum portion 8c.

The connecting portion 8d and the mass concentrating portion 8e generate a large moment of inertia when rotating.
In the illustrated example, the lower end surface of the mass concentration portion 8e is in a horizontal state and serves as a contact portion with respect to the lower limit stopper 12.
In the illustrated example, the upper end surface of the mass concentrating portion 8e is an inclined surface at a position lower than the front side, and in a state where the key is pressed as shown in FIG. It becomes.

In the key release state shown in FIG. 1A, when the white key main body 1 is pressed, the mass body 8 corresponding to this key rotates counterclockwise against gravity. During this time, a reaction corresponding to the moment of inertia of the mass body 8 is transmitted to the white key main body 1, thereby giving the player a feeling of mass.
As shown in FIG. 1B, when the upper end surface of the mass concentration portion 8e collides with the upper limit stopper (upper limit operation restricting member) 15, the upper limit position of the rotation range of the mass body 8 is restricted. At the same time, the mass body 8 is braked so that a sense of stop is obtained on the performer's finger through the key. When the performer releases the key, the mass body 8 rotates backward due to its own weight, and FIG. When the lower end surface of the mass concentrating portion collides with the lower limit stopper 12, the initial position (key release state) of the mass body is regulated.

In the above description, the plurality of key switches 17 are described as being disposed on the upper surface of the front upper mounting portion 3A. Instead, as in Patent Document 1, a protrusion (actuator) is formed on the lower end surface of the mass body 8, for example, the lower end surface between the main driven portion 8a and the rotation fulcrum portion 8c, and below that A circuit board on which the key switch 17 is placed may be provided.
The members erected in the key arrangement direction, that is, a plurality of support portions 3C and mass body support portions 3D arranged in parallel for each key, are formed separately from the key frame 3, and when assembled, It can be attached to the key frame 3. However, when the key frame 3 is made of a synthetic resin, these can be integrally molded as a part of the key frame 3 by forming the key frame 3 into a shape that can be integrally molded with a mold.
Further, the upper limit stopper 15 may be molded integrally with the front upper mounting portion 3A by a two-color molding method, or is bonded to the lower surface of the front upper mounting portion 3A with a double-sided adhesive tape or an adhesive. Also good.

The lower limit stopper 12 and the upper limit stopper 15 described above need to have a restoring force from the viewpoints of shock absorption, noise reduction, and reproducibility of the stop position of the mass body 8, such as felt or polyurethane elastomer. The operation regulation material is used.
The members from the main driven portion 8a and the sub driven portion 8b to the rotation fulcrum portion 8c in the mass body 8 are integrated with a synthetic resin or the like to become a base portion. This base is integrated by, for example, outsert molding in a state where the metal connecting portion 8d is inserted into the mold. The mass concentrating part 8e is made of metal that is integral with the connecting part 8d, for example.

FIG. 2 is an inverted perspective view showing a state in which the key frame 3 is turned upside down in the embodiment shown in FIG. 2A is a diagram in which the front portion of the key frame 3 is omitted, and FIG. 2B is an enlarged perspective view of the vicinity of the lower end surface 3d of the vertical rib.
In the figure, the same parts as those in FIG.
As described above, the intermediate base 3 b is a portion that abuts against the key frame bottom plate 4.
The lower end surface 3d is formed at a position one step below the intermediate base 3b in the illustrated inverted state. The lower end surface 3d has a planar shape that is widened on both sides of the width (specified width) of the vertical rib 3a in the key arrangement direction. Accordingly, the vertical rib 3a has a T-shaped cross section in the vicinity of the lower end surface 3d. The width of the lower end surface 3d is set so as not to become an obstacle when the mass body 8 is inserted between the vertical ribs.
As shown in FIG. 2A, the lower end surface of the intermediate base portion 3g is also widened in the key arrangement direction, similarly to the fixed portion 3c.

As shown in the figure, with the mounting plate 11 not yet attached to the lower end surface 3d, one mass body 8 is inserted into the gap between adjacent vertical ribs one by one from the upper rear side in a diagonally downward direction, as shown in FIG. The illustrated rotation fulcrum part 8c is fitted to the mass support part 3D.
Since the longitudinal distance of the key from the mass support part 3D to the rear base 3I is longer than the longitudinal distance of the key from the mass support part 3D to the rear end of the mass concentration part 8e, During insertion, the rear base 3I is less likely to become an obstacle.

FIG. 3 is an inverted perspective view showing a state after the attachment plate 11 is attached and fixed to the key frame 3 shown in FIG.
3A is a diagram in which the front portion of the key frame 3 is omitted, and FIG. 3B is an enlarged perspective view of the vicinity of the lower end surface 3d.
Screw holes 21 are formed in the rear base 3I and the front base 3F (not shown). Illustration of the mass body 8 is omitted.

After all the mass bodies 8 corresponding to all the keys are inserted into the key frame 3 and attached to the respective mass body support portions 3D, the keys are arranged on the lower end surface 3d provided on each of the plurality of vertical ribs. A mounting plate 11 that is long in the direction is fixed in a state of being installed. A lower limit stopper 12 is fixed in advance to the laterally projecting surface (front side in the longitudinal direction of the key) of the mounting plate 11. In any fixing, for example, the double-sided adhesive tape is fixed in between, or both are fixed by an adhesive.
As described with reference to FIG. 1, the lower limit stopper 12 is disposed away from the vertical rib 3 a.
After the mounting plate 11 is mounted and fixed, the key frame 3 is fastened and fixed to the key frame bottom plate 4 by screwing screws into the key frame bottom plate 4 from the screw holes 21.

Note that the lower end surface 3d may also be the lower end surface with the specified width of the vertical rib 3a, as with the intermediate base 3b. However, as shown in the figure, since the bonding area between the mounting plate 11 and the vertical rib 3a is increased by widening, the mounting plate 11 can be stably mounted on the plurality of vertical ribs 3a.
In particular, when the attachment plate 11 is fixed to the lower end surface 3d by adhesion or adhesion using an adhesive or a double-sided adhesive take or the like, the fixing strength is increased.
On the other hand, as a result of widening the lower end surface of the intermediate base portion 3g, the intermediate base portion 3g disperses the load of the key frame 3 applied to the buffer member 13 to improve the buffer function.
Further, if the lower end surface 3d and the intermediate base portion 3g described above are long portions of the key frame 3 extending in the key arrangement direction, a plurality of vertical ribs are connected to each other by the long portion. Also on the key frame bottom plate 4 side, the rigidity of the key frame 3 is increased, which is preferable. However, if the lower end surface 3d and the intermediate base 3g are long, it becomes an obstacle when the mass body 8 is inserted.

4 is an inverted perspective view showing an example in which the shape of the lower end surface of the vertical rib 3a for mounting and fixing the mounting plate 11 is changed in the embodiment shown in FIG. 1, and only a partially enlarged view is shown. Yes.
4A shows a state in which the key frame 3 is turned upside down, and FIG. 4B is an inverted perspective view showing a state after the attachment plate 11 is attached and fixed to the key frame 3.
In the figure, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals.
Reference numeral 31 denotes a lower end surface of a vertical rib for mounting and fixing the mounting plate 11, and is in a position lowered by one step from the intermediate base 3 b in the illustrated inverted state. The step from the intermediate base 3 b to the lower end surface 31 corresponds to the thickness of the mounting plate 11.

  A plurality of orthogonal ribs 32 are disposed on the lower end surface 31 along the longitudinal direction of the key. The orthogonal rib 32 has the appearance of a cross rib. Each orthogonal rib 32 is formed by protruding vertical ribs 32a and 32b having a predetermined height from the left and right side surfaces of the vertical rib 3a. The length of the protruding portion (the width of the orthogonal rib) is approximately the same as the widened width of the lower end surface 3d of the vertical rib shown in FIG. 2, but in the illustrated example, the length of the protruding portion is the lower end surface. The distance from 31 is shorter.

By providing one or a plurality of orthogonal ribs 32 on the lower end surface 31 of the vertical rib 3a, the area of the lower end surface 31 increases. Accordingly, similarly to FIGS. 2 and 3, since the joint area between the mounting plate 11 and the vertical rib 3a is increased, the mounting plate 11 can be stably mounted on the plurality of vertical ribs 3a.
In particular, when the attachment plate 11 is fixed to the lower end surface 31 by adhesion or adhesion using an adhesive or a double-sided adhesive take or the like, the fixing strength is increased.
Since the part which has a level | step difference in the lower end surface 31 and adjoins ahead is the same as that of FIG. 1, FIG. 2, the lower limit stopper 12 is spaced apart from the vertical rib 3a.
Although the illustration of the modified example of the intermediate base 3g shown in FIGS. 1 to 3 is omitted, the same shape as the lower end surface 31 can be used.

  In the above-described embodiment, one upper limit stopper 15 and one lower limit stopper 12 are arranged. However, in addition to this, the mass body 8 collides with the key frame 3 or the like with respect to the overstroke. An auxiliary stopper member may be added to prevent this. Further, a lower limit stopper member for preventing the white key main body 1 and the black key main body 2 from colliding with the key frame 3 when excessively pushed down may be added.

In the embodiment described above, the mass body 8 has a structure having the mass concentration portion 8e on the free end side thereof. However, any structure may be used as long as it rotates in conjunction with the key pressing operation of each key, and may have a structure in which mass is not clear. Since the lower limit stopper 12 and the upper limit stopper 15 are for restricting the operation of the mass body 8, the lower limit stopper 12 and the upper limit stopper 15 may be disposed so as to be in contact with any part of the mass body 8. For example, at least one may be disposed so as to contact the connecting portion 8d.
In the above-described embodiment, the mass body support portion 3D is erected on the lower surface of the front upper mounting portion 3A. However, a front lower mounting portion may be newly provided as a long portion in the key frame 3, and a mass body support portion may be erected on the upper surface.

It is a right view which shows typically the keyboard apparatus of the electronic musical instrument which is embodiment of this invention. FIG. 2 is an inverted perspective view showing a state in which the key frame is turned upside down in the embodiment shown in FIG. 1. FIG. 3 is an inverted perspective view showing a state after an attachment plate is attached and fixed to the key frame shown in FIG. 2. In the embodiment shown in FIG. 1, it is an inverted perspective view showing an example in which the shape of the lower end surface of the vertical rib for mounting and fixing the mounting plate is changed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... White key main-body part, 1a ... Tip part, 1b ... Key fulcrum part, 1c ... Force transmission part, 2 ... Black key main-body part, 2a ... Tip part, 2b ... Key fulcrum part,
3 ... Key frame, 3A ... Front upper mounting part, 3B ... Rear upper mounting part, 3C ... Key support part, 3D ... Mass body support part, 3E ... Vertical wall part, 3F ... Front base part, 3G ... Vertical wall part, 3H ... Step part, 3I ... Back base,
3a ... vertical rib, 3b ... intermediate base, 3c ... upper end surface with step, 3d ... lower end surface to which the mounting plate 11 is attached, 3e ... lower end surface with further step adjacent to the front of the lower end surface 3d, 3f ... vertical rib, 3g ... intermediate base, 3h ... vertical rib, 3i ... vertical rib 4 ... key frame bottom plate, 5, 6 ... key guide, 7 ... elastic member,
DESCRIPTION OF SYMBOLS 8 ... Mass body, 8a ... Main driven part, 8b ... Sub driven part, 8c ... Rotation fulcrum part, 8d ... Connection part, 8e ... Mass concentration part, 9 ... Mouth bar part, 10 ... Holding metal part, 11 ... Mounting plate, 12 ... lower limit stopper (11 + 12 or 12 alone: lower limit operation restricting member), 13, 14 buffer member, 15 ... upper limit stopper (upper limit operation restricting member), 16 ... through hole, 17 ... key switch, 18 ... upper Case

Claims (2)

A plurality of keys, a plurality of mass bodies that rotate in conjunction with a key pressing operation of each key, and a plurality of key support portions are juxtaposed rearward, and the plurality of mass body support portions are below the plurality of keys. A frame arranged side by side, an upper limit operation regulating member that is fixed to the frame side and regulates the upper limit of the rotation range of the mass body by collision of the mass body, and the frame in the key arrangement direction In the keyboard device of the electronic musical instrument having a lower limit operation restricting member that is fixedly attached to the side and restricts the lower limit of the rotation range of the mass body when the mass body collides,
The frame has a plurality of long portions including a front base portion and a rear base portion , and a plurality of vertical ribs,
The plurality of long portions extend in an arrangement direction of the plurality of keys,
Said plurality of vertical ribs, comprising said front base and the rear base, said plurality of at least a portion of the elongated portion, connected to each other, so that the gaps of the plurality of vertical ribs the mass body is rotated Are arranged in parallel in the arrangement direction of the plurality of keys,
Each lower end surface of the plurality of vertical ribs is in an independent state in an intermediate portion between the front base and the rear base,
The lower limit operation restricting member is attached and fixed to a lower end surface of each of the plurality of vertical ribs in the intermediate portion , and a portion that is partially wider than the width of the vertical rib in the key arrangement direction. And
The frame is supported at least by the front base, the rear base, and the lower limit operation restricting member.
A keyboard device for an electronic musical instrument. The lower movement limiting member, which lower limit stopper is fixed to the mounting member is elongated in the array direction of the key, the mounting member, the portion which is partially widened than the width of said vertical ribs Mounting fixed ,
The keyboard device for an electronic musical instrument according to claim 1.

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