JP4946679B2 - Keyboard device - Google Patents

Description

  The present invention relates to a keyboard device used for an electronic keyboard instrument or the like, and more particularly, to a key and mass (hammer) structure for improving the touch feeling of a key.

  Conventionally, for example, a keyboard device as shown in Patent Document 1 has been proposed in order to obtain a natural key press feeling (mass feeling) like an acoustic piano in a keyboard device of an electronic keyboard instrument. In this type of keyboard device, for example, a mass body that rotates up and down in conjunction with the rotation of the key is provided on the key.

  The rotation range (from the initial position to the push-off position) of the mass body described above is regulated by two stoppers. In the keyboard device, when the mass body comes into contact with one of the two stoppers, the key becomes the key pressing position, and when the mass body comes into contact with the other of the two stoppers, the key becomes the initial position.

  When the player presses the key, the mass body collides with the stopper as described above. Since the stopper includes a material having a certain degree of flexibility and elasticity such as felt, when the mass body and the stopper collide, the stopper is elastically deformed, and the kinetic energy of the mass body is absorbed by the internal loss of the stopper. Thereby, the impact at the time of a collision with a mass body and a stopper is buffered, and it contributes to braking.

  However, the stopper generates an elastic restoring force when returning from the elastic deformation. This elastic restoring force becomes a repulsive force (rebound) against the key through the mass body and is transmitted to the performer's finger, giving the player an unpleasant feeling (the key does not stop tightly and blurs). there were.

  In order to solve the above problem, a keyboard device has been proposed in which a cavity is provided in a mass body and the cavity is filled with fine particles (for example, Patent Document 2). According to this keyboard apparatus, since the fine particles absorb the collision energy between the stopper and the mass body, there is an advantage that the repulsive force transmitted to the player at the time of pressing can be reduced.

However, in the keyboard device described in Patent Document 2, since the distribution of the fine particles in the cavity portion is biased at the initial position when the key pressing operation is performed several times, the mass body and the stopper become the pressing position due to this. There was a problem that the feeling of stop transmitted to the performer was different each time.
Japanese Patent Laid-Open No. 9-198037 JP-A-8-16153

  Therefore, the present invention pays attention to the above-mentioned problems, and by making the distribution of fine particles in the cavity at the initial position of the key the same every time, a keyboard device that can stably obtain a good stop feeling It is an issue to provide.

  In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that a plurality of keys arranged in parallel in the left-right direction and a rear end of the key so that a front end of the key can be rotated in the vertical direction. A frame for supporting a portion, a mass body supported by the frame so as to rotate in the vertical direction in conjunction with the rotation of the key, and the key and the mass body in contact with the key or the mass body A keyboard device including a stopper for restricting the rotation range of the plurality of cavities, wherein the mass body is provided in a part of the cavity, and a plurality of cavities filled in the cavity so as to be movable in the cavity. The keyboard device is characterized by having a fine particle, a partition wall that divides the cavity into two or more, and a supply hole provided in a lower portion of the partition wall.

  According to a second aspect of the present invention, the taper that approaches the lower side as it goes from the one space separated by the two or more to the other space or the lower portion of the one space is higher than the lower portion of the other space. The keyboard device according to claim 1, wherein a step is provided at a lower portion of the hollow portion. Note that at least when the key is in the initial position, the taper is provided so as to approach the lower side from one space to the other space, and the lower portion of one space is higher than the lower portion of the other space. What is necessary is just to be provided.

  The invention according to claim 3 resides in the keyboard device according to claim 2, wherein the one space is provided closer to the rotation fulcrum of the mass body than the other space.

  The invention according to claim 4 is characterized in that a communication hole is provided in the upper part of the partition wall, and a taper approaching the upper side from the other space toward the one space is provided on the upper side of the cavity. The present invention resides in the keyboard device according to claim 2.

  As described above, according to the first aspect of the present invention, at the initial position of the key, the pressure generated in the fine particles accumulated in one space in the front-rear direction separated by the partition wall by its own weight, and the other space by its own weight. Until the pressure generated in the collected fine particles is balanced, a flow of fine particles from one space to the other space or from the other space to the one space can be created through the supply hole. Thereby, the distribution of the fine particles in the cavity at the initial position of the key can be made the same every time, and a good stop feeling can be stably obtained.

  According to the second aspect of the present invention, by providing a taper or a step on the bottom surface of the cavity, it is possible to stably produce a flow of fine particles from one space toward the other space. For this reason, the distribution of the fine particles in the cavity at the initial position of the key can be made the same each time, and a good stop feeling can be stably obtained.

  According to the third aspect of the present invention, the distribution of the fine particles stored in one space is more varied than the distribution of the fine particles stored in the other space. For this reason, by providing one space where the dispersion of the fine particle distribution is large on the side closer to the rotation fulcrum and making it less susceptible to the moment of inertia due to the fine particles in this one space, a more reliable stop feeling can be obtained more reliably. It can be obtained stably.

  According to the fourth aspect of the present invention, since the fine particles in the other space are guided to the one space through the communication hole by the guide wall at the time of the push-off, after the push-off, the first position from the one space through the supply hole again. The flow of fine particles toward the other space can be made. For this reason, the distribution of the fine particles in the cavity at the initial position of the key can be made the same each time, and a good stop feeling can be stably obtained.

First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing a keyboard device 100 according to the first embodiment. FIG. 2 is an enlarged view of the weight portion 32 shown in FIG. In the following description, “up / down / left / right front / back” of the keyboard device 100 means “up / down / left / right front / back” when viewed from the performer side during performance.

  The keyboard device 100 is used for an electronic keyboard instrument, for example. As shown in the figure, the keyboard device 100 includes a plurality of black keys 10 and white keys 11 as keys, a frame 20, a mass body 30, and an upper limit stopper 41 and a lower limit stopper 42 as stoppers. Yes.

  A plurality of the black keys 10 and the white keys 11 are juxtaposed in the left-right direction. The frame 20 includes an upper plate portion 21, a front standing wall portion 22 and a rear standing wall portion 23 that are suspended from both front and rear ends of the upper plate portion 21, and a front bottom plate portion 24 provided on the front side of the lower end of the front standing wall portion 22. And a rear wall 25 that is erected on the front side of the front bottom plate 24, and a rear bottom plate 26 that is provided on the rear side of the rear vertical wall 23.

  On the upper surface on the front side of the upper plate portion 21 described above, a key guide portion 27 is provided to guide the front end portion of the black key 10 in the vertical direction when the black key 10 is depressed. In addition, a key guide portion 28 that vertically guides the front end portion of the white key 11 when the white key 11 is depressed is provided upright at the upper end portion of the standing wall portion 25 described above.

  On the upper surface of the rear side of the upper plate portion 21 described above, a key support portion 21A that supports the rear end portions of the black key 10 and the white key 11 so that the black key 10 and the white key 11 can be rotated in the vertical direction. Is provided. The black key 10 and the white key 11 are pivotally supported by the key support portion 21A with the rotation axis C1 as a fulcrum, and rotate around the rotation axis C1.

  The mass body 30 is provided on the lower side of the upper plate portion 21, extending in the front-rear direction, the weight portion 32 provided on the rear side of the arm portion 31, and on the front side of the arm portion 31. The operation part 33 is comprised. The arm portion 31 is pivotally supported by the mass body support portion 21B with the rotation axis C2 of the operating portion 33 as a fulcrum. The mass body support portion 21B is provided on the lower surface of the upper plate portion 21 in front of the key support portion 21A.

  The rear end of the arm portion 31 is provided so as to protrude rearward from the rear standing wall portion 23. Thereby, the weight part 32 is provided in the rear side rather than the rear side standing wall part 23. FIG. In addition, a connecting piece 33A that is bifurcated into upper and lower portions is formed at the front end of the operating portion 33, and is connected to the lower end portion of the operating portion 12 that protrudes downward from the black key 10 and the white key 11. The plate 12B is connected to the connecting piece 33A.

  The upper limit stopper 41 and the lower limit stopper 42 described above are stoppers that abut the mass body 30 and restrict the rotation range of the black key 10 and the white key 11. The upper limit stopper 41 is provided at the rear end portion of the upper plate portion 21. Then, when the performer depresses the black key 10 and the white key 11, the action part 12 pushes down the actuating part 33, and the mass body 30 rotates counterclockwise in FIG. 1 about the rotation axis C2, When the mass body 30 and the upper limit stopper 41 come into contact with each other, a push-off state is established. On the other hand, the lower limit stopper 42 is provided on the rear bottom plate portion 26. When the performer stops the key pressing operation, the mass body 30 rotates clockwise in FIG. 1 about the rotation axis C2, and when the mass body 30 and the lower limit stopper 42 come into contact with each other, the initial position is set. Become.

  Next, the structure of the weight part 32 mentioned above is demonstrated with reference to FIG. The weight portion 32 includes a hollow portion 32A, fine particles 32B (FIG. 3), a partition wall 32C, a supply hole 32D, and a communication hole 32E. The hollow portion 32A is provided as a closed space. The fine particles 32B are filled in the cavity 32A so as to be movable in the cavity 32A. That is, the fine particles 32B are filled so that an empty space is provided in the hollow portion 32A. The fine particles 32B are made of sand, metal powder, other ceramics, metal, plastic, or the like. The size is preferably a diameter and an outer shape of 3 mm or less. In FIG. 3, the fine particles 32B are spheres, but the fine particles 32B are not limited to spheres.

  The partition wall 32C is a wall that separates the cavity portion 32A in the front-rear direction, and is provided substantially perpendicular to the front-rear direction. In the first embodiment, the front space separated by the partition wall 32C in the front-rear direction is referred to as a first particle accumulation region 32A-1, and the rear space is referred to as a second particle accumulation region 32A-2. The supply hole 32D is provided at the lower end of the partition wall 32C. The communication hole 32E is provided at the upper end of the partition wall 32C. The first fine particle accumulation region 32A-1 and the second fine particle accumulation region 32A-2 communicate with each other through the supply hole 32D and the communication hole 32E.

  On the bottom surface of the cavity 32A described above, the step 32A- is such that the bottom surface of the second particle accumulation region 32A-2 as one space is higher than the bottom surface of the first particle accumulation region 32A-1 as the other space. 3 is provided. The step 32A-3 is provided with a taper 32A-4 that approaches the lower side from the second particle accumulation region 32A-2 toward the first particle accumulation region 32A-1.

  On the upper surface of the cavity 32A described above, a tapered first guide that approaches the upper side as it goes from the first particle accumulation region 32A-1 to the second particle accumulation region 32A-2 above the first particle accumulation region 32A-1. A wall 32A-5 is provided. Further, the upper surface of the cavity 32A described above has a tapered shape that approaches the lower side as it goes from the first particle accumulation region 32A-1 to the second particle accumulation region 32A-2 above the second particle accumulation region 32A-2. A second guide wall 32A-6 is provided.

  Further, a protrusion 32A-7 protruding toward the partition wall 32C is provided on the rear side surface of the cavity portion 32A described above. The partition wall 32C described above is provided with a protrusion 32C-1 that protrudes toward the side surface of the cavity 32A provided with the protrusion 32A-7. The protrusions 32A-7 and the protrusions 32C-1 are provided alternately along the vertical direction.

  The movement of the fine particles 32B filled in the cavity 32A in the keyboard device 100 configured as described above will be described below with reference to FIG. In an initial state in which the key pressing operation of the black key 10 and the white key 11 is not performed, the fine particles 32B are gathered below the cavity portion 32A by gravity as shown in FIG. At this time, the pressure generated in the fine particles 32B accumulated in the first fine particle accumulation region 32A-1 by the dead weight and the pressure generated in the fine particles 32B accumulated in the second fine particle accumulation region 32A-2 are balanced. The flow of the fine particles 32B through 32D is not generated. Thereafter, when the black key 10 and the white key 11 are pressed, the weight portion 32 is rotated upward in conjunction with the rotation of the black key 10 and the white key 11, and the mass body 30 is moved to the upper limit stopper 41. It comes into contact and pushes down.

  The moment of inertia acts on the fine particles 32B by the contact between the mass body 30 and the upper limit stopper 41, and the fine particles 32B move above the hollow portion 32A as shown in FIG. Thereby, since the fine particles 32B absorb the collision energy between the mass body 30 and the upper limit stopper 41, the repulsive force is reduced.

  At this time, the fine particles 32B accumulated in the first fine particle accumulation region 32A-1 move above the cavity 32A and then hit the first guide wall 32A-5. Then, as a result of moving along the order of the first guide wall 32A-5 and the second guide wall 32A-6, the first guide wall 32A-5 is supplied to the second particle accumulation region 32A-2 through the communication hole 32E.

  As a result, when the key pressing operation is finished and the mass body 30 reaches the initial position where it comes into contact with the lower limit stopper 42, as shown in FIG. The amount of fine particles 32B accumulated in the fine particle accumulation region 32A-2 increases. Therefore, the fine particles 32B flow from the second fine particle accumulation region 32A-2 to the first fine particle accumulation region 32A-1 through the supply hole 32D.

  Thereafter, the pressure generated in the fine particles 32B accumulated in the first fine particle accumulation region 32A-1 and the pressure generated in the fine particles 32B accumulated in the second fine particle accumulation region 32A-2 are balanced, as shown in FIG. When returning to the state, the flow of the fine particles 32B through the supply holes 32D stops. Thereby, the distribution of the fine particles 32B in the hollow portion 32A in the black key 10 and the white key 11 can be made the same every time, and a good stop feeling can be stably obtained.

  Further, according to the keyboard device 100 described above, the step 32A-3 and the taper 32A-4 are provided on the bottom surface of the cavity 32A. As described above, by providing the step 32A-3 and the taper 32A-4 on the bottom surface of the cavity 32A, the flow of the particles 32B from the second particle accumulation region 32A-2 toward the first particle accumulation region 32A-1 stably. Can be made. For this reason, the distribution of the fine particles 32B in the hollow portion 32A at the initial positions of the black key 10 and the white key 11 can be more reliably made the same every time, and a good stop feeling can be stably obtained.

  Further, according to the keyboard device 100 described above, the protrusions 32A-7 and 32C-1 provided alternately in the vertical direction are provided in the second fine particle accumulation region 32A-1. Thereby, the flow of the fine particles 32B in the second fine particle accumulation region 32A-2 can be rectified to prevent variation in the distribution of the fine particles 32B in the second fine particle accumulation region 32A-2.

Second Embodiment Next, a second embodiment will be described. FIG. 4 is a schematic cross-sectional view showing the keyboard device 100 according to the second embodiment. FIG. 5 is an enlarged view of the weight portion 32 shown in FIG. 4 and 5, the same parts as those already described in the first embodiment described above with reference to FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The difference from the first embodiment is the configuration of the weight portion 32. As shown in FIGS. 4 and 5, the weight portion 32 has a cavity portion 32A, fine particles 32B, partition walls 32C, supply holes 32D, and communication holes 32E, as in the first embodiment. Yes. Since the cavity 32A, the fine particles 32B, the supply holes 32D, and the communication holes 32E are the same as those in the first embodiment, detailed description thereof is omitted. Similar to the first embodiment, the partition wall 32C is a wall that separates the cavity 32A in the front-rear direction, and is provided substantially perpendicular to the front-rear direction. In the second embodiment, similarly to the first embodiment, the front space separated in the front-rear direction by the partition wall 32C is defined as the first particle accumulation region 32A-1, and the rear space is defined as the second particle accumulation region 32A-2. And

  On the bottom surface of the cavity 32A described above, the step 32A- is such that the bottom surface of the second particle accumulation region 32A-2 as one space is higher than the bottom of the first particle accumulation region 32A-1 as the other space. 3 is provided. The step 32A-3 is provided with a taper 32A-4 that approaches the lower side from the second particle accumulation region 32A-2 toward the first particle accumulation region 32A-1. Further, similarly to the first embodiment, the first guiding wall 32A-5 and the second guiding wall 32A-6 are provided on the upper surface of the hollow portion 32A. Further, a rectifying wall 32F for rectifying the vertical flow of the fine particles 32B is provided in the second fine particle accumulation region 32A-2. The rectifying wall 32F is provided so as to be substantially parallel to the partition wall 32C. The rectifying wall 32F is provided such that its height is lower than the height of the partition wall 32C. In the keyboard device 100 having the above-described configuration, the movement of the fine particles 32B filled in the cavity 32A is substantially the same as that in the first embodiment, and thus detailed description thereof is omitted here.

  According to the keyboard device 100 described above, as in the first embodiment, the hollow portion 32A is separated in the front-rear direction by the partition wall 32C, and the supply hole 32D is provided at the lower end of the partition wall 32C. The distribution of the fine particles 32B in the hollow portion 32A can be made the same every time, and a good stop feeling can be stably obtained. Further, the step 32A-3 and the taper 32A-4 are provided on the bottom surface of the cavity portion 32A, and the first guide wall 32A-5 and the second guide wall 32A-6 are provided on the upper side, so that the inside of the cavity portion 32A can be more reliably provided. The distribution of the fine particles 32B can be made the same every time, and a good stop feeling can be stably obtained.

  Further, according to the keyboard device 100 described above, the plurality of rectifying walls 32F are arranged side by side in the second fine particle accumulation region 32A-2 so as to be substantially parallel to the partition walls 32C. Thereby, the flow of the fine particles 32B in the second fine particle accumulation region 32A-2 can be rectified to prevent the distribution of the fine particles 32B in the second fine particle accumulation region 32A-2 from varying.

Third Embodiment Next, a third embodiment will be described. FIG. 6 is a schematic cross-sectional view showing the keyboard device 100 according to the third embodiment. FIG. 7 is an enlarged view of the weight portion 32 shown in FIG. 6 and FIG. 7, parts that are the same as those already described in the first embodiment with reference to FIGS. 1 and 2 are given the same reference numerals, and detailed descriptions thereof are omitted.

  The difference from the first embodiment is the configuration of the weight portion 32. As shown in FIGS. 6 and 7, the weight portion 32 has a cavity portion 32A, fine particles 32B, partition walls 32C, supply holes 32D, and communication holes 32E, as in the first embodiment. Yes. Since the cavity 32A, the fine particles 32B, the supply holes 32D, and the communication holes 32E are the same as those in the first embodiment, detailed description thereof is omitted. The partition wall 32C is a wall that separates the cavity 32A in the front-rear direction, and in the third embodiment, the upper side is provided inclined to the rear side. In the third embodiment, the front space separated in the front-rear direction by the partition walls 32C is referred to as a second particle accumulation region 32A-2, and the rear space is referred to as a first particle accumulation region 32A-1.

  On the bottom surface of the cavity 32A described above, the step 32A- is such that the bottom surface of the second particle accumulation region 32A-2 as one space is higher than the bottom of the first particle accumulation region 32A-1 as the other space. 3 is provided. Further, the step 32A-3 is provided with a taper 32A-4 that approaches the lower side from the second particle accumulation region 32A-2 toward the first particle accumulation region 32A-1. Further, a taper 32A-8 that is closer to the lower side from the second particle accumulation region 32A-2 toward the first particle accumulation region 32A-1 is also provided on the bottom surface in front of the step 32A-3. In addition, a first guide wall 32A-5 is provided on the upper surface of the cavity 32A, as in the first embodiment.

  A plurality of, for example, two rectifying walls 32F for rectifying the vertical flow of the fine particles 32B are provided in the second fine particle accumulation region 32A-2. The plurality of rectifying walls 32F are spaced apart from each other so as to be substantially parallel to the partition wall 32C. The rectifying wall 32F is provided such that its height is lower than the height of the partition wall 32C. In the keyboard device 100 having the above-described configuration, the movement of the fine particles 32B filled in the cavity 32A is substantially the same as that in the first embodiment, and thus detailed description thereof is omitted here.

  According to the keyboard device 100 described above, as in the first embodiment, the hollow portion 32A is separated in the front-rear direction by the partition wall 32C, and the supply hole 32D is provided at the lower end of the partition wall 32C. The distribution of the fine particles 32B in the hollow portion 32A can be made the same every time, and a good stop feeling can be stably obtained. Further, the step 32A-3 and the tapers 32A-4 and 32A-8 are provided on the bottom surface of the cavity portion 32A, and the first guide wall 32A-5 is provided on the upper side, so that the fine particles 32B in the cavity portion 32A can be more reliably provided. Can be made the same every time, and a good stop feeling can be stably obtained.

  Further, according to the keyboard device 100 described above, the plurality of rectifying walls 32F are arranged side by side in the second fine particle accumulation region 32A-2 so as to be substantially parallel to the partition walls 32C. Thereby, the flow of the fine particles 32B in the second fine particle accumulation region 32A-2 can be rectified to prevent the distribution of the fine particles 32B in the second fine particle accumulation region 32A-2 from varying.

  Further, according to the keyboard device 100 described above, the second particle accumulation region 32A-2 is provided closer to the rotation fulcrum (rotation axis C2) of the mass body 30 than the first particle accumulation region 32A-1. Yes. The distribution of the fine particles 32B accumulated in the second fine particle accumulation region 32A-2 is more varied than the distribution of the fine particles 32B accumulated in the space of the first fine particle accumulation region 32A-1. For this reason, the second fine particle accumulation region 32A-2 having a large variation in the fine particle 32B distribution is provided on the side closer to the rotation fulcrum so as to be less affected by the moment of inertia due to the fine particles 32B in the second fine particle accumulation region 32A-2. Thus, it is possible to stably obtain a good stop feeling more reliably.

  In addition, according to the 1st-3rd embodiment mentioned above, although the bottom part of 32 A of hollow parts provided both level | step difference 32A-3 and taper 32A-4, this invention is not limited to this. For example, only the step 32A-3 may be provided as shown in FIG. 8A, or only the taper 32A-4 may be provided as shown in FIG. 8B. Moreover, although the bottom part of the cavity part 32A may be provided flat, it is more optimal to provide the step 32A-3 and the taper 32A-4 as described above.

  Moreover, according to the first to third embodiments described above, the first and second guide walls 32A-5 and 32A-6 are provided, but the present invention is not limited to this. Instead of providing the first and second guide walls 32A-5 and 32A-6 on the upper surface of the cavity portion 32A, for example, the upper surface of the cavity portion 32A may be provided on a plane.

  In addition, according to the first to third embodiments described above, the upper and lower limit stoppers 41 and 42 are in contact with the mass body 30 to restrict the rotation ranges of the black key 10, the white key 11, and the mass body 30. However, the present invention is not limited to this. For example, the upper and lower limit stoppers 41 and 42 may be in contact with the black key 10 and the white key 11 to restrict the rotation range of the black key 10, the white key 11, and the mass body 30.

  Further, according to the first to third embodiments described above, the hollow portion 32A is provided in the weight portion 32 provided at the rear end portion of the mass body 30, but the present invention is not limited to this. . The hollow portion 32 </ b> A may be anywhere as long as it is a part of the mass body 30.

  Further, according to the first to third embodiments described above, the partition wall 32C has two hollow portions 32A, but the present invention is not limited to this. For example, two partition walls 32C may be provided so that the cavity portions 32A are separated into three, or the cavity portions 32A may be separated into four or more.

  Further, according to the first to third embodiments described above, the partition wall 32C separates the cavity 32A in the front-rear direction, but the present invention is not limited to this. The partition wall 32C may be provided so as to separate the cavity portion 32A into two or more. For example, the cavity portion 32A may be provided so as to be separated in the horizontal direction and the vertical direction.

  Further, according to the first to third embodiments described above, the taper 32A-4 and the step 32A-3 are provided on the bottom surface of the cavity 32A, but the present invention is not limited to this. The taper 32A-4 and the step 32A-3 may be provided below the cavity 32A. For example, the taper 32A-4 and the step 32A-3 may be provided above the bottom surface of the cavity 32A.

  Further, according to the first to third embodiments described above, the first guide wall 32A-5 and the second guide wall 32A-6 are provided on the upper surface of the cavity portion 32A, but the present invention is not limited to this. Not a thing. The first guide wall 32A-5 and the second guide wall 32A-6 may be provided on the upper portion of the cavity portion 32A. For example, the first guide wall 32A-5 and the second guide wall 32A-5 are provided below the upper surface of the cavity portion 32A. A wall 32A-6 may be provided.

  Further, the above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications can be made without departing from the scope of the present invention.

It is a schematic sectional drawing which shows the keyboard apparatus of this invention in 1st Embodiment. It is an enlarged view of the weight part shown in FIG. It is a figure for demonstrating the motion of the microparticles | fine-particles with which the cavity part was filled. It is a schematic sectional drawing which shows the keyboard apparatus of this invention in 2nd Embodiment. It is an enlarged view of the weight part shown in FIG. It is a schematic sectional drawing which shows the keyboard apparatus of this invention in 3rd Embodiment. It is an enlarged view of the weight part shown in FIG. (A) And (B) is an enlarged view of the weight part in other embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Black key (key), 11 ... White key (key), 20 ... Frame, 30 ... Mass body, 32A ... Hollow part, 32B ... Fine particle, 32C ... Partition, 32D ... Supply hole, 32E ... Communication hole, 32A- DESCRIPTION OF SYMBOLS 1 ... 1st fine particle accumulation | storage area | region (other space), 32A-2 ... 2nd fine particle accumulation | storage area | region (one space), 32A-3 ... level | step difference, 32A-4 ... taper, 32A-5 ... 1st guide wall (taper) 41 ... Upper limit stopper (stopper), 42 ... Lower limit stopper (stopper), 100 ... Keyboard device

Claims (4)

A plurality of keys arranged side by side in the left-right direction, a frame that supports the rear end of the key so that the front end of the key can be rotated in the up-down direction, and up and down in conjunction with the rotation of the key In a keyboard device comprising: a mass body supported by the frame so as to rotate in a direction; and a stopper that contacts the key or the mass body and regulates the rotation range of the key and the mass body.
A cavity part provided in a part, a plurality of fine particles filled in the cavity part so as to be movable in the cavity part, a partition wall separating the cavity part into two or more, and And a supply hole provided in a lower part of the partition wall. A taper that approaches the lower side from one space separated by two or more to the other space or a step that makes the lower portion of the one space higher than the lower portion of the other space is the lower portion of the cavity portion. The keyboard device according to claim 1, wherein the keyboard device is provided.   The keyboard device according to claim 2, wherein the one space is provided closer to the rotation fulcrum of the mass body than the other space. A communication hole is provided in the upper part of the partition wall,
The keyboard device according to claim 2, wherein a taper approaching the upper side from the other space toward the one space is provided on the upper side of the hollow portion.

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