The disclosure relates to a keyboard device, and more particularly to a keyboard device for which the number of parts can be reduced.
The rotation center of the key of an acoustic piano is located on the rear side relatively far from the front end (player side) of the key; therefore, when the key of the acoustic piano is pressed, the entire key (area where the key can be pressed) is displaced to sink downward by a predetermined amount. In this regard, Patent Literature 1 discloses a technique for rotatably connecting a front link bar 6 and a rear link bar 7 that are rotatable with respect to a base 2 to a front end side and a rear end side of a key 3, respectively. According to this technique, the rotation of the front link bar 6 and the rear link bar 7 when the key 3 is pressed can cause the front end side and the rear end side of the key 3 (the entire key 3) to be displaced downward.
[Patent Literature 1] Japanese Patent Lain-Open No. 2019-056781 (for example,
However, in the above-mentioned conventional technique, since the displacement of the rear end part of the key is guided by the rotation of the link, there is a problem that the number of links (that is, the number of part) increases.
The disclosure has been in view of the above, and the disclosure provides a keyboard device for which the number of parts can be reduced.
In order to achieve the above, a keyboard device of the disclosure includes: a support member; a link with one end side rotatably connected to the support member; a key rotatably connected to an other end side of the link; a guiding pin which is provided on one of a part on a rear end side of the key and a support member side and which extends in a width direction of the key; and a guiding groove which is provided on the other of the part on the rear end side of the key and the support member side and into which the guiding pin is inserted. A displacement of a part on a front end side of the key is guided by rotation of the link with respect to the support member, and a displacement of the part on the rear end side of the key is guided by sliding of the guiding pin with respect to the guiding groove.
In
In
In
In
In
Hereinafter, exemplary embodiments will be described with reference to the accompanying drawings. First, with reference to
In (b) of
As shown in (a) of
The panel 3 includes a front panel 3a, a back panel 3b disposed to face the front panel 3a in the front-rear direction (arrow F-B direction), and a pair of end panels 3c connecting the left and right ends of the front panel 3a and the back panel 3b. The white keys 10 and the black keys 20 are surrounded by the front panel 3a, the back panel 3b, and the pair of end panels 3c.
On the upper surface of the back panel 3b, for example, a display device formed of an LED, a liquid crystal display, or the like for displaying various states, and multiple operators for adjusting the volume, changing modes, and the like are provided (none of them are shown). Further, on the back surface of the back panel 3b, for example, a power switch, multiple jacks for inputting and outputting MIDI signals and audio signals, and the like are provided (none of them are shown).
As shown in (b) of
A guiding member 6 is fixed on the upper surface of the rear base 50, and the guiding member 6 includes a guiding groove 60 for sliding displacement of the rear end part of the key 2. The guiding groove 60 is a groove formed to pass through the guiding member 6 in the left-right direction. The white key 10 and the black key 20 include a pair of left and right support plates 11 and 21 protruding rearward from the rear ends thereof, and guiding pins 12 and 22 in a columnar shape that cross to the left and right between the pair of support plates 11 and 21.
The groove width of the guiding groove 60 (dimension in the direction orthogonal to the sliding direction of the guiding pins 12 and 22) is formed to be equal to or slightly less than the diameter of the guiding pins 12 and 22, and the guiding pins 12 and 22 are slidably inserted into the guiding groove 60. Therefore, the displacement on the rear end side of the white key 10 and the black key 20 is guided by the sliding of the guiding pins 12 and 22 along the guiding groove 60. In addition, the displacement of the white key 10 and the black key 20 on the front side of the guiding pins 12 and 22 is guided by the rotation of the hammer 4.
In this embodiment, each base of the chassis 5 (the rear base 50, the central base 51, and the front base 52) and the guiding member 6 configure a support member for supporting the key 2 and the hammer 4, and a part or all of each base of the chassis 5 and the guiding member 6 may be integrally formed (as one component) to configure the support member.
Next, the detailed configuration of the keyboard device 1 will be described with reference to
In addition, in
Further, in the following description, the configuration of the white key 10 will be mainly described, but the configuration in which a hammer 4 is rotated in conjunction with the key pressing or key releasing of the black key 20, and the configuration in which the displacement of the black key 20 is guided by the rotation of the hammer 4 or the sliding of the guiding pin 21 (see (b) of
As shown in
In the hammer 4, the part on the rear side (arrow B side) of the shaft 40 is the mass part 41, and the part on the front side (arrow F side) of the shaft 40 is the pressing part 42. A shaft 43 in a columnar shape extending in the left-right direction is formed in the pressing part 42, and a connecting part 13 rotatably connected to the shaft 43 is formed to protrude downward from the lower surface of the white key 10.
Therefore, when the white key 10 is pressed (see
In addition, when the white key 10 is pressed, the pressing part 42 is displaced downward, and since a substrate 7 having the switch S on the upper surface is provided below the pressing part 42, when the white key 10 is pressed, the switch S is pushed by the pressing part 42. The key pressing information (note information) of the white key 10 is detected by the on/off operation of the switch S, and a musical note signal based on the detection result is output to the outside. Although the substrate 7 is fixed to cross the central base 51 and the front base 52, it may be configured that the substrate 7 is supported by the chassis 5.
The state in which the switch S is pushed by the pressing part 42 (the state shown in
The guiding pin 12 extending in the left-right direction (in the width direction of the white key 10) is formed at a part on the rear end side of the white key 10, and the guiding pin 12 is slidably inserted into the guiding groove 60 extending in the up-down direction. Therefore, the guiding pin 12 can be slid downward along the guiding groove 60 to follow the downward displacement (rotation of the hammer 4) on the front end side of the white key 10. As a result, the displacement on the rear end side of the white key 10 can be guided by the sliding of the guiding pin 12 in the guiding groove 60.
As described above, in this embodiment, the displacement on the front end side of the white key 10 is guided by the rotation of the hammer 4 with respect to the chassis 5 (central base 51), and the displacement on the rear end side of the white key 10 is guided by the sliding of the guiding pin 12 with respect to the guiding groove 60. This can eliminate the need for links to guide the displacement on the rear end side of the white key 10, thus allowing the number of parts to be reduced.
Further, the hammer 4 has the mass part 41 on the side opposite to the shaft 43 with the shaft 40 interposed therebetween, and the displacement on the front end side of the white key 10 is guided by the rotation of the hammer 4; therefore, the hammer 4 can have both a function as a link for guiding the displacement of the white key 10 and a function for giving a feeling of key pressing. Since the distance from the shaft 40 of the hammer 4 to the center of gravity G of the hammer 4 is set to be greater than the distance from the shaft 40 to the shaft 43, the moment of the center of gravity G around the shaft 40 can be increased. As a result, the hammer 4 can give the player a feeling of key pressing associated with the rotation of the hammer 4 while reducing the size (weight) of the hammer 4.
Here, the center of rotation of the key of the acoustic piano is disposed at a position relatively distant from the upper surface of the key (the area where the key can be pressed) to the rear lower side; however, in the following description, the center of rotation will be defined as a reference point P.
The reference point P in the white key 10 (black key 20) is a point located on the rear lower side of the guiding pin 12 in the side view of the white key 10, and is a point located at a position where the distance from the front end of the upper surface of the white key 10 in the initial state is 200 mm or more and 500 mm or less to the rear side in the horizontal direction and 0 mm or more and 100 mm or less to the lower side in the vertical direction.
When the key of the acoustic piano rotates around the reference point P at the time of key pressing, the displacement trajectory is such that the entire key slides forward in addition to being displaced to sink downward. That is, in the key pressed state in which the key is pressed to the end position of the key pressing (hereinafter the description is abbreviated as the “key pressed state”), the entire key is disposed on the front lower side as compared with the initial state.
In this regard, in this embodiment, the guiding groove 60 is formed in a way in which the end position (see
Further, when the key of the acoustic piano rotates around the reference point P at the time of key pressing, the stroke of the rear end (the amount of downward displacement from the initial state to the key pressed state) in the key-pressable area on the upper surface of the key is about ½ of the stroke of the front end of the key. Therefore, in this embodiment, the guiding groove 60 is formed in a way in which the stroke (for example, 5 mm) at the rear end in the key-pressable area (area exposed from the panel of
As described above, in the acoustic piano, the entire key rotates around the reference point P; therefore, in order to achieve the closest approximation to the displacement trajectory of the key, it is desirable to rotate the entire white key 10 around the reference point P.
That is, when a virtual circle C1 is drawn which is a virtual circle centered on the reference point P and which passes through the shaft 43 in the side view of the white key 10, it is preferable that the shaft 43 is rotated along the virtual circle C1. Further, when a virtual circle C2 is drawn which is a virtual circle centered on the reference point P and which passes through the center (axis) of the guiding pin 12 in the side view of the white key 10, it is preferable that the guiding pin 12 is slid along the virtual circle C2 (the guiding groove 60 is formed along the virtual circle C2). However, in order to rotate the shaft 43 along the virtual circle C1, it is necessary to dispose the shaft 40 of the hammer 4 on the reference point P, which causes the hammer 4 to be large.
Therefore, in this embodiment, the shaft 40 of the hammer 4 is disposed on the front side (arrow F side) of the guiding pin 12 to reduce the size of the hammer 4, but in this case, the shaft 43 is displaced outside the ideal virtual circle C1. In this regard, in this embodiment, since the guiding groove 60 is formed in a curved shape that is convex in the direction away from the reference point P, even when the size of the hammer 4 is reduced, the stroke (downward displacement amount) of the entire white key 10 during the key pressing can be approximated to that of the key of the acoustic piano.
Specifically, by disposing the shaft 40 of the hammer 4 in front of the guiding pin 12 and setting the radius of gyration of the shaft 43 with respect to the shaft 40 to be less than the radius of curvature of the virtual circle C1, as described above, the size of the hammer 4 can be reduced. In addition, the displacement trajectory of the shaft 43 becomes one that goes around the outside (front side) of the virtual circle C1, but as shown in (a) of
That is, while the displacement trajectory of the shaft 43 during the key pressing deviates to the outside of the virtual circle C1, the guiding pin 12 can be displaced to the outside of the virtual circle C2 to follow the deviation. As a result, the ratio of the stroke on the rear end side to the stroke on the front end side of the white key 10 can be easily kept constant from the initial state to the key pressed state. Therefore, the stroke of the entire white key 10 (the posture of the white key 10) during the key pressing can be approximated to that of the key of the acoustic piano.
Then, the position of the shaft 40 is set so that the center (axial center) of the shaft 43 is located on the virtual circle C1 in each of the initial state and the key pressed state (see
As described above, according to this embodiment, even when the size of the hammer 4 is reduced, the stroke of the entire white key 10 during the key pressing and the posture of the key in the key pressed state can be approximated to those of the key of the acoustic piano. Therefore, it is possible to provide a playing feeling close to that of the acoustic piano.
The “shape in which the guiding groove 60 is curved more strongly than the virtual circle C2” means that, for example, when the guiding groove 60 is formed from a single arc, the radius of curvature of the guiding groove 60 is set to be less than the radius of curvature of the virtual circle C2 (i.e. the curvature of the guiding groove 60 is larger than that of the virtual circle C2). That is, it is a shape in which the part of the white key 10 (the axial center of the guiding pin 12) located on the virtual circle C2 in the initial state rotates around the outside of the virtual circle C2 during the key pressing, and is located on the virtual circle C2 again in the key pressed state.
Here, for example, if the guiding pin 12 is configured to come into contact with the inner wall surface of the terminal end of the guiding groove 60 at the end position of the sliding of the guiding pin 12, abnormal noise may be generated due to the contact. Therefore, in this embodiment, the guiding groove 60 is formed sufficiently long so that a gap is formed between the terminal end (lower end) of the guiding groove 60 and the guiding pin 12 at the end position of the sliding of the guiding pin 12. As a result, it is possible to suppress the generation of abnormal noise due to the contact between the inner wall surface at the terminal end of the guiding groove 60 and the guiding pin 12.
Further, as shown in
Further, the guiding groove 60 includes an opening 60a that opens on the rear surface side of the guiding member 6, and the guiding pin 12 can be inserted and removed with respect to the guiding groove 60 from the opening part 60a (insertion and removal in the direction perpendicular to the axis of the guiding pin 12). As a result, the rear end side of the white key 10 can be attached to and detached from the guiding member 6; therefore, maintenance of the white key 10 can be facilitated. Further, since the opening 60a is formed on the start end side of the sliding of the guiding pin 12, it is possible to suppress the generation of abnormal noise due to the contact between the inner wall surface of the guiding groove 60 and the guiding pin 12 at the time of key releasing.
Further, the connecting part 13 is provided with a shaft hole 13a into which the shaft 43 is rotatably fitted, and the shaft hole 13a includes an opening 13b that opens on the lower surface of the connecting part 13. As a result, the shaft 43 can be inserted and removed from the opening 13b (insertion and removal in the direction perpendicular to the axis of the shaft 43); therefore, the front end side of the white key 10 can be attached to and detached from the shaft 43. That is, since the entire white key 10 can be attached to and detached from the guiding groove 60 and the shaft 43, the maintenance of the white key 10 can be further facilitated.
As described above, in this embodiment, the displacement of the white key 10 is guided by the rotation of the hammer 4 and the sliding of the guiding pin 12 in the guiding groove 60. However, the insertion position of the guiding pin 12 with respect to the guiding groove 60 may deviate from the desired position in the initial state, for example, due to variations in the dimensions of each member (for example, the total length of the white key 10) or assembly errors. Therefore, in this embodiment, it is configured that the disposition of the guiding groove 60 in the front-rear direction can be adjusted.
Specifically, the chassis 5 is provided with a pair of front and rear through holes 5a extending in the up-down direction, and the rear base 50 is screwed into the through holes 5a by screws 5b inserted from the lower surface side of the chassis 5. The through hole 5a is formed as a long hole whose length in the front-rear direction is longer than the shaft part of the screw 5b. Therefore, it is configured that by adjusting the insertion position of the screw 5b with respect to the through hole 5a, the disposition of the rear base 50 and the guiding member 6 with respect to the chassis 5 in the front-rear direction, that is, the disposition of the guiding groove 60 in the front-rear direction can be adjusted. Therefore, the insertion position of the guiding pin 12 with respect to the guiding groove 60 can always be adjusted to a desired position even when the dimensional variation or the assembly error occurs in each member.
Here, since the rotation center of the black key of the acoustic piano is located on the rear side (arrow B side) with respect to the rotation center of the white key (reference point P), the stroke on the rear end side of the black key to the end position of the key pressing becomes greater than the stroke on the rear end side of the white key. In this regard, in this embodiment, as shown in (b) of
As a result, the stroke on the rear end side of the black key 20 when the guiding pins 12 and 22 slide to the end position can be made greater than that of the white key 10; therefore, a playing feeling similar to that of an acoustic piano can be provided. The “gentle curved shape (close to the virtual circle C2)” means that, for example, when the guiding groove 60 is formed from a single arc, the radius of curvature of the guiding groove 60 is large.
Next, the second to fourth embodiments will be described with reference to
First, a keyboard device 201 of the second embodiment will be described with reference to
In
As shown in (a) of
Here, a case where the white key 10 is pressed is described with reference to (b) of
As shown in (b) of
Further, since the guiding groove 260 is formed in a linear shape, compared with the case where the guiding groove 60 is formed in a curved shape as in the first embodiment, it is possible to suppress the occurrence of variation in the shape of the guiding groove 260 provided for each white key 10. Therefore, the stroke on the rear end side of each white key 10 can be made uniform.
The shape of the guiding groove 260 is set so that the center of the guiding pin 12 is located on the virtual circle C2 in each of the initial state and the key pressed state. Therefore, the posture of the white key 10 in the initial state and the key pressed state can be approximated to that of the key of the acoustic piano.
In the key pressed state, since a gap is formed between the terminal end (lower end) of the guiding groove 260 and the guiding pin 12, it is possible to suppress the generation of abnormal noise due to the contact between the inner wall surface of the guiding groove 260 and the guiding pin 12. Further, since the guiding member 206 is provided with the cushioning material 8 (see
Further, the guiding groove 60 includes an opening 260a that opens on the rear surface side of the guiding member 206, and the guiding pin 12 can be inserted and removed from the opening 260a. As a result, maintenance of the white key 10 can be facilitated. Further, since the opening 260a is formed on the start end side of the sliding of the guiding pin 12, it is possible to suppress the generation of abnormal noise due to the contact between the inner wall surface of the guiding groove 260 and the guiding pin 12 at the time of key releasing.
Next, a keyboard device 301 of the third embodiment will be described with reference to
In
As shown in (a) of
The white key 310 includes a guiding groove 314 extending upward from the lower surface thereof. The guiding groove 314 is a groove formed to pass through the white key 310 in the left-right direction. The groove width of the guiding groove 314 is formed to be equal to or slightly less than the diameter of the guiding pin 361, and the guiding pin 361 is slidably inserted into the guiding groove 314. Therefore, when the white key 310 is pressed, the guiding groove 314 slides downward along the guiding pin 361, whereby the downward displacement on the rear end side of the white key 310 is guided. This can eliminate the need for links to guide the displacement on the rear end side of the white key 310, thus allowing the number of parts to be reduced.
Further, though not shown, one guiding pin 361 is fixed across multiple guiding members 306 (for one octave in this embodiment) disposed side by side in the left-right direction. That is, since the common guiding pin 361 is inserted in each of the guiding grooves 314 of the multiple white keys 310 (black keys), the displacement on the rear end side of the multiple white keys 310 can be guided by one guiding pin 361. Therefore, the number of parts can be reduced.
Here, a case where the white key 310 is pressed is described with reference to (b) of
As shown in (b) of
Further, also in this embodiment as in the first embodiment, the shaft 40 of the hammer 4 is disposed on the front side of the guiding pin 361; therefore, the shaft 43 is displaced outside the ideal virtual circle C1 during the key pressing (see
Specifically, as in the first embodiment described above, by disposing the shaft 40 of the hammer 4 on the front side of the guiding pin 361, the size of the hammer 4 can be reduced. In addition, the displacement trajectory of the shaft 43 becomes a displacement trajectory that goes around the outside of the virtual circle C1 (see
That is, while the displacement trajectory of the shaft 43 during the key pressing deviates to the outside of the virtual circle C1, the rear end side of the white key 310 can be displaced to follow the deviation. As a result, the ratio of the stroke on the rear end side to the stroke on the front end side of the white key 310 can be easily kept constant from the initial state to the key pressed state. Therefore, the stroke of the entire white key 310 during the key pressing can be approximated to that of the key of the acoustic piano.
Further, since the shape of the guiding groove 314 is set in a way in which the part 310a of the white key 310 located on the virtual circle C2 in the initial state is located on the virtual circle C2 in the key pressed state as well, the posture of the white key 310 in the initial state and the key pressed state can be approximated to that of the key of the acoustic piano. Therefore, it is possible to provide a playing feeling close to that of the acoustic piano.
In the key pressed state, since a gap is formed between the terminal end (upper end) of the guiding groove 314 and the guiding pin 361, it is possible to suppress the generation of abnormal noise due to the contact between the inner wall surface of the guiding groove 314 and the guiding pin 361. Further, since the guiding member 306 is provided with the cushioning material 8 (see
Further, the guiding groove 314 includes an opening 314a that opens on the lower surface side of the white key 310, and the guiding pin 361 can be inserted and removed from the opening 314a. As a result, maintenance of the white key 310 can be facilitated. Further, since the opening 314a is formed on the start end side of the sliding of the guiding pin 361, it is possible to suppress the generation of abnormal noise due to the contact between the inner wall surface of the guiding groove 314 and the guiding pin 361 at the time of key releasing.
Further, though not shown, the guiding groove of the black key has a gentler curved shape than the guiding groove 314 of the white key 310, as in the first embodiment. That is, for the strokes of the white key 310 and the black key when the guiding pin 361 slides to the terminal position, the stroke of the black key is set to be greater than that of the white key 310. Therefore, it is possible to provide a playing feeling close to that of the acoustic piano.
Next, a keyboard device 401 of the fourth embodiment will be described with reference to
In
As shown in (a) of
Here, a case where the white key 410 is pressed is described with reference to (b) of
As shown in (b) of
Further, since the guiding groove 414 is formed in a linear shape, compared with the case where the guiding groove 314 is formed in a curved shape as in the third embodiment, it is possible to suppress the occurrence of variation in the shape of the guiding groove 414 provided for each white key 410.
Further, since the shape of the guiding groove 414 is set in a way in which a part 410a of the white key 410 located on the virtual circle C2 in the initial state is located on the virtual circle C2 in the key pressed state as well, the posture of the white key 310 in the initial state and the key pressed state can be approximated to that of the key of the acoustic piano. Therefore, it is possible to provide a playing feeling close to that of the acoustic piano.
In the key pressed state, since a gap is formed between the terminal end (upper end) of the guiding groove 414 and the guiding pin 361, it is possible to suppress the generation of abnormal noise due to the contact between the inner wall surface of the guiding groove 414 and the guiding pin 361. Further, since the guiding member 306 is provided with the cushioning material 8 (see
Further, the guiding groove 414 includes an opening 414a that opens on the lower surface side of the white key 310, and the guiding pin 361 can be inserted and removed from the opening 414a. As a result, maintenance of the white key 410 can be facilitated. Further, since the opening 414a is formed on the start end side of the sliding of the guiding pin 361, it is possible to suppress the generation of abnormal noise due to the contact between the inner wall surface of the guiding groove 414 and the guiding pin 361 at the time of key releasing.
Although the disclosure has been described based on the above embodiments, the disclosure is not limited to the above embodiments, and it can be easily inferred that various improvements and modifications may be made within the scope that does not deviate from the spirit of the disclosure.
In each of the above embodiments, the case where the keyboard devices 1, 201, 301, 401 are configured as an electronic piano has been described, but the disclosure is not necessarily limited thereto. For example, the technical idea of each of the above embodiments can be applied to other electronic musical instruments (for example, electronic organs, synthesizers, accordions, and the like).
In each of the above embodiments, the case where the displacement on the front end side of the key 2 is guided by the hammer 4 for providing the feeling of key pressing (returning the key 2 to the initial position) has been described, but the disclosure is not necessarily limited thereto. For example, it may be configured that the displacement on the front end side of the key 2 is guided by a link that does not have the function of providing the feeling of key pressing (returning the key 2 to the initial position). In this case, the key 2 may be returned to the initial position by an elastic body such as a spring.
In each of the above embodiments, the case where one hammer 4 functions as a link to guide the rotation of the key 2 has been described, but the disclosure is not necessarily limited thereto. For example, it may be configured that a link for guiding the rotation of the key 2 is separately provided in addition to the hammer 4. That is, if it is configured that the displacement on the rear end side of the key 2 is guided by the guiding groove and the guiding pin, at least one link for guiding the displacement on the rear end side can be omitted.
In each of the above embodiments, the case where the shaft 40 of the hammer 4 is located on the rear side of the shaft 43 has been described, but the disclosure is not necessarily limited thereto. For example, the shaft 40 of the hammer 4 may be located on the front side of the shaft 43.
In each of the above embodiments, the case has been described in which the distance from the shaft 40 of the hammer 4 to the center of gravity G is set to be longer than the distance from the shaft 40 to the shaft 43, but the disclosure is not necessarily limited thereto. For example, the distance from the shaft 40 of the hammer 4 to the center of gravity G may be set to be equal to or shorter than the distance from the shaft 40 to the shaft 43.
In each of the above embodiments, the case where the shaft 40 of the hammer 4 is disposed on the front side of the guiding pins 12, 22 and 361 has been described, but the disclosure is not necessarily limited thereto. For example, the shaft 40 of the hammer 4 may be disposed on the rear side of the guiding pins 12, 22 and 361. As a result, the displacement trajectory on the front end side of the key 2 can be further approximated to that of the key of the acoustic piano.
In each of the above embodiments, the case where the shaft 43 is located on the virtual circle C1 in the key pressed state has been described, but the disclosure is not necessarily limited thereto. For example, the shaft 43 of the hammer 4 may be located inside or outside the virtual circle C1 in the key pressed state.
In each of the above embodiments, the case where the guiding pins 12, 22 and 361 are formed in a columnar shape (whose cross section is circular) has been described, but the disclosure is not necessarily limited thereto. For example, the cross-sectional shape of the guiding pins 12, 22 and 361 may be formed into a polygon as long as the guiding pins can 12, 22 and 361 slide along the guiding grooves 60, 314 and 414.
In each of the above embodiments, the case where the guiding pins 12, 22 and 361 are inserted into the guiding grooves 60, 314 and 414 penetrating in the left-right direction has been described, but the disclosure is not necessarily limited thereto. For example, it may be configured that the guiding grooves 60, 314 and 414 are recesses formed on the side surfaces of the guiding member 6 and the key 2, and the guiding pins are slid along the recesses.
In each of the above embodiments, the case has been described in which the guiding grooves 60, 314 and 414 are formed in a way in which the rear end part of the key 2 is displaced to the front lower side at the time of key pressing, but the disclosure is not necessarily limited thereto. For example, the guiding grooves 60, 314 and 414 may be formed in a way in which the rear end part of the key 2 is displaced to the rear lower side or the lower side.
In each of the above embodiments, the case where the openings 60a, 314a and 414a are formed in the guiding grooves 60, 314 and 414 has been described, but the disclosure is not necessarily limited thereto. For example, it may be configured that the openings 60a, 314a and 414a are omitted, and the start end side and the terminal end side of the guiding grooves 60, 314 and 414 are closed. In this case, it may be configured that the guiding pins 12, 22 and 361 come into contact with the inner wall surface of the start end or the terminal end of the guiding grooves 60, 314 and 414 at the time of key pressing or key releasing.
In each of the above embodiments, the case has been described in which the cushioning material 8 is provided on the guiding members 6, 206 and 306 to regulate the downward displacement of the key 2, but the disclosure is not necessarily limited thereto. For example, the cushioning material 8 may be provided at the terminal end of the guiding grooves 60, 314 and 414. That is, the disposition of the cushioning material 8 can be set as appropriate as long as the displacement of the key 2 can be regulated at the end position of the key pressing, but it is preferable to dispose the cushioning material 8 on the rear end side of the key 2 (near the guiding pins 12, 22 and 361) so that the displacement on the rear end side of the key 2 can be regulated at a desired position.
In each of the above embodiments, the case has been described in which the part of the key 2 located on the virtual circle C2 in the initial state is disposed on the virtual circle C2 in the key pressed state, but the disclosure is not necessarily limited thereto. For example, it may be configured that the part of the key 2 located on the virtual circle C2 in the initial state is disposed inside or outside the virtual circle C2 in the key pressed state.
In the first and third embodiments, the case has been described in which the guiding grooves 60 and 314 are formed in a curved shape to protrude inward or outward with respect to the virtual circle C2, but the disclosure is not necessarily limited thereto. For example, the guiding groove 60 may be formed in a curved shape convex in a direction approaching the reference point P, or the guiding groove 314 may be formed in a curved shape convex in a direction away from the reference point P. Further, the guiding grooves 60 and 314 may be formed in a curved shape along the virtual circle C2 (an arc shape having the same radius of curvature as the virtual circle C2).
In the first and third embodiments, the case has been described in which the guiding grooves 60 and 314 are formed in a gentle curved shape to make the stroke on the rear end side of the black key 20 greater than that of the white keys 10 and 310, but the disclosure is not necessarily limited thereto. For example, the shapes of the guiding grooves 60 and 314 may be the same for the white key and the black key so that the strokes on the rear end side of the white keys 10 and 310 and the black key 20 are the same.
In the third and fourth embodiments, the case has been described in which the common guiding pin 361 is inserted into the guiding grooves 314 and 414 of the multiple keys 2, but the disclosure is not necessarily limited thereto. For example, as in the first and second embodiments, a separate guiding pin may be provided for each key 2 (each guiding member 306).
Filing Document | Filing Date | Country | Kind |
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PCT/JP2019/049592 | 12/18/2019 | WO |